US3073501A - Semi-erected carton - Google Patents

Semi-erected carton Download PDF

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Publication number
US3073501A
US3073501A US796813A US79681359A US3073501A US 3073501 A US3073501 A US 3073501A US 796813 A US796813 A US 796813A US 79681359 A US79681359 A US 79681359A US 3073501 A US3073501 A US 3073501A
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Prior art keywords
carton
panels
panel
cover
flaps
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US796813A
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Marshall I Williamson
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Federal Paper Board Co Inc
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Federal Paper Board Co Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/18—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding a single blank to U-shape to form the base of the container and opposite sides of the body portion, the remaining sides being formed primarily by extensions of one or more of these opposite sides, e.g. flaps hinged thereto
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S229/00—Envelopes, wrappers, and paperboard boxes
    • Y10S229/915—Stacking feature
    • Y10S229/917—Stacking of collapsed container or blank

Definitions

  • This invention relates to cartons formed of paper board, or related sheet stock, of the type having a reclosable cover hinged to a box part and adapted to telescope over the open end of the box part, and has for its object the provision of an improved carton of this type, particularly a carton having a sealed reclosable cover with releasable locking means such as the type widely known as the KLIKTOP, and a process comprising a sequence of operations or steps in forming the carton.
  • the invention provides a semi-erected carton, which is in a state of erection intermediate between the blank state and the filled and completed carton.
  • the blank usedin forming the carton consists of a single sheet of paper board of suitable weight and toughness having cuts and fold lines by means of which it can be formed into a carton having rectangular sides, ends, bottom and means for forming the cover.
  • the flat blank In forming the semierected carton of the elevation, the flat blank partly is glued and folded into a flat position in which state it is distributed to the user for complete erection filling with goods andgluing.
  • the latching means on the cover is formed from a flap which is folded back in the contiguous cover panel and secured in that position to form a reinforced cover panel having an inner abutmentv edge which engages an abutment edge of a hinged abutment flap on the front panel of a carton.
  • This reinforced part of the cover is secured as by glue or other connection to the front panel of the carton in the semi-erected state.
  • the front panel of the carton has. at least one nearly cut out segment area, and may have a few nearly cut out segment areas, to which the folded back latching flap of the cover is attached by glue.
  • the carton cover is opened by prying it away from the front panel which causes the segment area or areas to be torn from the front panel and, because they are glued to the folded-back part of the cover, they remain there.
  • the segment area or areas may be cut partly through the thickness of the paper in which case only a layer of each segment will be peeled off and retained on the folded-back part.
  • the folded back portion of the cover closure or flap. is. omitted and the, inner face of the cover panel is glued directly over the front panel having the cut segment area or areas. These. segment areas are, so nearly completely out out that they become attached to the cover and transferred to the front panel of the cover when the cover is opened to provide the closure abutment edges.
  • the prying away of the cover from the front panel, or the front panel from the cover severs the connection between them.
  • the partly erected carton of the invention can be changed from its fiat folded semi-erected position to a box-like position having the ends open, either by hand or by machine, and the goods can be inserted through either open end.
  • the carton is filled with merchandise, some of the panels are folded into position, glue is applied to two of the opposite end panels and cover flaps, and the end panels and cover flaps are folded into position and glued together.
  • One of the important features of this invention is that it provides a Kliktop type box that can be formed, and completely sealed, including the cover, entirely by mechanical means.
  • the weakly sealed cover closure part canbe opened easily, by -the user and thereafter opened and closed repeatedly.
  • FIG. 1 is a plan view of a paper board blank which has been cut and scored for forming a carton of the: invention
  • FIG. 2 is a plan view of a semi-erected carton in flat position formed of the blank of FIG. 1;.
  • FIG. 3 is an end view of the carton of FIG; 2 showing in full lines an intermediate position to illustrate the arrangement-of FIG. 2, and in broken lines with the front and back panels andthe bottom andcove'r panels in parallel positions, and with the ends open in the pdsition for filling with merchandise;
  • FIG. 4 is a perspective of the top erected carton with parts removed
  • FIG. 5 is a sectional view at 5-5 of FIG. 4;
  • FIG. 6 is a view similar to that of FIG. 4 with the cover open; I 2
  • FIG. 7 is a cross-sectional view similar to section 5-5 of FIG. 4,. but with the carton cover partly open;
  • FIG. 8 is a perspective view of the top portion of a modification of the fully erected carton
  • FIG. 9 is a cross-sectional view of FIG. 8, FIG. 5 but with the cover open;
  • FIG. 10 is a plan view of a modification of paper board blank which has been out and scored for forming a carton of the invention.
  • FIG. 11 is a plan view of a semi-erected carton in fiat position formed of the blank of FIG. 10-;
  • FIG. 12 is an end view of the cartonof FIG. 11. show ing in full lines an intermediate position to illustrate the arrangement of FIG. IL, and in broken lines with the front and back panels and the bottom and cover panels in parallel positions, and with the ends open in the position for filling with merchandise;
  • FIG. 13 is'a perspective of the semi-erected cartoriof FIGS. 11 and 12 when filled with merchandise, the inner end panels and flaps folded into position and: the projectflaps ready for glue;
  • FIG. 14 is a view of the carton of FIG. 13 in the position for application of glue to the extendingpan'els;
  • FIG. 15 is a perspective of the completely erectedcar ton. of FIG. 14, after the panels and flaps have been glued into position;
  • FIG. 16 is a plan view of another modification of paper board blank which has been cut and scored for forming a carton of. the invention.
  • FIG. 17 is a plan position formed'of theblank of FIG. 16;?
  • FIG. 18 is an end view of the carton of FIG. lTshow ing in r n lines an intermediate position to illustrate the view of a semi erecte'd cartonin fiat arrangement of FIG. 17, and in broken lines with the front and back panels and the bottom and cover panels in parallel positions, and with the ends open in the position for filling with merchandise;
  • FIG. 19 is a perspective view of the semi-erected carton 'of FIGS. 17 and 18 ready to be filled with merchandise;
  • FIG. 20 is a fragmentary perspective view of the carton of FIG. 19 after filling and showing the application of glue to one of the panels;
  • FIG. 21 is a view similar to FIG. 20 showing the application of glue to a flap
  • FIG. 22 is a perspective view of the filled and completely closed carton.
  • FIG. 23 is a plan view of still another modification of paper board blank which has been cut and scored for forming a carton of the invention.
  • FIG. 28 is a perspective view of the filled and completely closed carton
  • FIG. 29 is a further fragmentary perspective view of a detail
  • FIG. 30 is a fragmentary view of the upper portion of the carton after the initial opening and before reclosing
  • FIG. 31 is a fragmentary perspective view illustrating a detail shown in FIG. 30.
  • FIG. 32 shows a modification of another detail.
  • the blank shown in FIG. 1 is formed of stiff paper board and the face showing will be 'on the inside of the completely erected carton. For reasons which are important in gluing the panels to minimize warping, the grain of the fibers extends in the lengthwise direction of the blank.
  • the blank has score lines 1 and 2 with or without interrupted slits, cuts 3, 4, 5, 6, 7 and 8, and score lines 9, 10, 11, 12, 13 and 14.
  • the panel 15 formsthe front of the carton.
  • the flap 17 has an abutment edge 18 and can assume either the position of FIGS. 4 and 5, or FIGS. 6 and 7 when the carton is first completed and before use by the customer.
  • the panels 20 and 21 are integral with panel 15 and form the outer ends of the carton.
  • the panel 22 forms the bottom and the dust flaps 23 and 24 are integral with the bottom and are turned upwardly inside the carton as part of the ends.
  • the panel 25 forms the back of the carton and has integral panels 26 and 27 which are bonded to panels 20 and 21 to form the ends when the carton is completely erected.
  • the upper ends of panels 26 and 27 have flaps 30 and 31 that are bent inwardly to extend over the upper open top of the carton as shown in FIG. 6 to stiffen the carton during gluing.
  • the cover structure consists of a central top panel 32 and a depending front or latching panel 33 and two end panels 34 and 35 which, when arranged as in FIGS. 4 to 9, form the telescoping or exterior depending end portions of the cover.
  • the glue flaps 36 and 37 are folded over and glued to the cover panel 32 as shown in FIGS. 4 and 8.
  • the latching flap 38 may be used as in the modifications shown in FIGS. 4 and 5, or omitted as in the modification shown in FIGS. 8 and 9. Flap 38 is folded over and glued to the panel 33 to provide the inside abutment edge 39 as shown in FIGS. 5, 6 and 7.
  • the semi-erected carton shown in FIGS. 2 and 3 is formed of the blank of FIG. 1 by folding the front panel 15 and end panels 20 and 21 on score line 12 to overlie panels 22, 23 and 24, and to partly overlie panels 25, 26 and 27.
  • End panels 20 and 21 have their corners cut off diagonally, as shown in FIG. 1, and a glue strip is applied transversely to pass over the triangles 40, 41 and 42 which are cut in the top of front panel 15.
  • the entire surfaces of panels 20, 21 and 15 are printed, with the exception of the triangular areas 40, 41 and 42, and the glue is eflfective only in these areas.
  • Panels 32, 33, 34 and 35, and glue flaps 36 and 37 are folded along score line 10 to overlie the end portion of panel 15, as shown in FIG. 2, and panel 33 and flap 38, which has been folded and glued to its inner surface, are pressed against the glue on triangular areas 40, 41 and 42, thereby sealing the carton in its semi-erected position, as shown in FIG. 2.
  • the diagonal edges of the cut-off corners may touch the glue wheel.
  • FIG. 3 shows the panels spread apart in full lines for clarity and it will be noted that the panels and flaps 17, 20, 21, 23, 24, 26, 27, 30, 31, 34 and 35 are left in their extended flat positions so that when the carton assumes the position shown in broken lines the opposite ends are open.
  • the inside surface of flap 38 is glued to the triangles 40, 41 and 42 in such position that the edges 43, 44 and 45 of the triangles are coincident with the aubtment edge 39. This increases the thickness of the abutment edge when the cover is opened and the triangles are transferred to the flap 38 providing a better locking engagement with the abutment edge 18.
  • the flap 17 which carries the abutment edge 18 may be left extended as in FIG. 2 in which case it will occupy the inwardly extending position shown in FIGS. 4, 5 and 8 in the completed carton.
  • flap 17 In order for this flap to form a locking engagement with flap 38, so that abutment edges 18 and 39 are in locking contact, which is a characteristic of the so-called Kliktop cartons, flap 17 must be bent forward and downward.
  • the flap 17 is bent outwardly in removing the goods to the position shown in FIG. 7 and when the cover is closed, the flap is pressed downward to its locking position.
  • the flap 17 may be bent to this locking position prior to forming the semi-erected carton of FIGS. 2 and 3.
  • the blank of FIG. 1 and the semi-erected carton as shown in FIGS. 2 and 3 do not have the glue applied on the shaded areas shown when the blank is flat. These areas are shaded to show where the glue will eventually be applied.
  • the glue is applied on panels 20, 21, 34, 35 and flaps 36 and 37 after the carton has been erected to the position shown in broken lines in FIG. 3, and filled with merchandise.
  • the small glued areas on the panels 34 and 35 are for sealing these panels to only small areas of panels 26 and 27 near the hinge or fold line 10 of the cover. It will be noted that the corners of panels 20 and 21 are cut off diagonally and that when flaps 34, 35, 36, and 37 are folded over to the position shown in FIG. 2, in which position the glue is applied as shown in FIG. 14, that panels 20 and 21 mask the unglued parts of flaps 34 and 35 whereas the diagonal cuts permit the application of glue to the small areas of flaps 34 and 35. After the glue has been applied, the glued panels and fiaps are folded and pressed into their glued position shown in FIG. 8 by mechanical means now available.
  • the customer opens the cover by prying apart the panels 33 and thereby tearing the triangles from the panel 15. Then the cover may be limited in the usual way.
  • the cover can be opened and reclosed repeatedly with abutment reengagement and release at each closing.
  • the blank of FIG. 1 may omit the flap 38 in which case the inner surface of panel 33 is glued directly to the triangles 4t), 41 and 42 when forming the semi-erected carton of FIGS. 2 and 3.
  • the edges 43, 44 and 45 of the triangles become the abutment edge of the cover to engage the abutment edge 18 of the flap 17 as shown in FIGS. 8 and 9.
  • the blank shown in FIG. 10 is generally similar to the blank of FIG. 1 and is formed of similar paper board.
  • the blank has score lines and 51, with or without interrupted cuts, cuts 52, 53, 54, 56, 57, 58 and 59, and score lines 61, 62, 63, 64, and 66.
  • the panel is the front of the carton, the flap 71 has an abutment edge 72 and can be used in the same manner as flap 17 of FIG. 1.
  • the panels 73 and 74 are integral with panel 70 and form the outer ends of the carton.
  • Panel 75 forms the bottom of the carton and the glue flaps 76 and 77 are for sealing the bottom edges as shown in FIG. 15.
  • the dust flaps 80 and 81 are integral with bottom 75 and are turned up inside the carton.
  • the panel 82 forms the back of the carton and has integral panels 83 and 84 which are bonded to panels 73 and 74, respectively, in the completed carton to form the ends.
  • the small flaps 85 and 86 are folded inwardly in the completed carton and serve mainly to stiilen the carton during erection and gluing.
  • the cover of the carton is formed of the top panel 87, the front depending cover panel 88, and panels 89 and 90, glue flaps 92 and 93, and latching flap 94 having an abutment edge 95 which engages the abutment edge 72 in the latching of the cover.
  • the triangles of the form shown in FIGS. 1-9 have been replaced by a single continuous, narrow cut-scored segment area 96 having an edge 97 which functions in relation to the flap 94 and abutment edge 95 in the same manner as the corresponding parts of FIG. 1.
  • the glue is applied to the blank in the manner previously described by an applicator which applied a strip transversely across the blank over the area 96 before panels 87, 88, 89 and 9t ⁇ and glue flaps 92 and 93 have been folded along score line 62 to the position shown in FIG. 11.
  • glue may be applied to the inside face of flap 94 (the face shown in FIG. 10).
  • the surfaces of panels 70, 73 and 74 are printed with the exception of area 96 and it is only the glue on this area that is etfective as an adhesive.
  • segment area 96 may consist merely of a strip of glue, the cut-scoring being omitted.
  • strip of glue will be sufficiently narrow so that it can be broken by prying apart from the front panel 70 of the carton the front cover panel 88 to which flap 94 has been glued.
  • the semi-erected carton of FIG. 11 is formed by folding flap 94 over on cover panel 88 and then folding panels 76, 71, 73 and 74 along score line 64, 180 into contact with panels 82, 83 and 84, thereby gluing flap 94 to panel 88 and panel 88 to the segment area 96.
  • glue have been received on the edges of the blank by the applicator which applied the glue strip over area 96, such undesirably glued portions have now been masked by the panels 89 and 96. This prevents such glue from contacting adjacent blanks or semi-erected cartons when they are stacked.
  • the latching flap 94 may be used or not as in FIG. 1, but when used it is folded over and glued to the inside. of panel 8 8'.
  • the front panel 88 becomes glued to the segment area 96. Then the cover panels and flaps are folded along score line 62 to the position shown in FIG. 11 and the inner face of fiap 94 is pressed into glued contact with the segment area 96, securing the carton in its semi-erected position.
  • FIG. 12 shows in full lines the carton in a partly opened condition merely to illustrate the arrangement of the parts, and in broken lines, to show the position it assumes when mechanically pushed in the direction of the arrows to the position for mechanically filling with merchandise through the open ends.
  • FIG. 13 shows the carton after it has been filled and after the flaps 85 and 86 have been turned in, flaps 80 and 81 have been :folded in and the panels 83 and 34 folded in over them.
  • the panels and [flaps 89, 92, 73 and 76 on one end, and the panels and flaps 90, 93, '74 and 77 on the opposite end are left extending outwardly in their original fiat positions of FIG. 11.
  • the panels 73 and 74 partly mask the end panels 89 and 90, the diagonally cut ofi corners leaving parts of these panels exposed for the application of glue by the glue wheels.
  • FIG. 14 shows a more advanced step in the sequence of operations with the carton of FIG. 13 being carried on a conveyor 102 with the extended flaps and panels passing over the glue wheels 103 and 104, to apply glue to the areas for completely sealing the cart-on.
  • the panels 73 and 74 are pressed into glued contact with panels 83 and 84 and 89 and 90, respectively.
  • the glue flaps 76 and 77 and the glue flaps 9'2 and 93 are bent over and pressed into glued contact with the bottom panel 75 and the top panel 87, respectively, thereby completely finishing the carton.
  • the customer price the front cover panel 88 outwardly, breaking the connection of the segment area 96 with the front panel 70, and the cover can be lifted open and swung on score line 62 as a hinge.
  • a strip of glue is used instead of segment area or cut-scored area 96, the prying of cover panel 88 severs such glue strip.
  • the cover is closed, the abutment edges 72 and 95 function in the manner characteristic of Kliktop cartons.
  • the triangles 40, 41 and 42 of FIG. 2 are a convenient means of providing removable glued sections to reinforce or to provide abutment edges.
  • Other shaped areas may be used which will provide abutment edges, such as rectangles, circles or semicircles.
  • FIGS- 16-22 there is illustrated a further modification of the carton.
  • the blank shown in FIG. 16 is somewhat similar to the blank of FIG. 1 and is formed of similar paper board.
  • the blank has score lines 105 and 106, with or without interrupted cuts, cuts 107, 108, 109, and 1-10, and score lines 111, 112, 113, 114, 115,, and 116.
  • the panel 117 forms the front of the carton.
  • the flap 118 has an abutment edge 119 and can be used in the same manner as. flap 17 of FIG. 1.
  • the panels 120 and 121 are integral with panel 117.
  • Panel 122 forms the bottom of the carton, and dust flaps 123 and 124 which are integral with the bottom 122 serve to make a tight seal for the bottom edges as. shown in FIG. 21, and will be apparent later on.
  • Panel 125 forms the back of the carton and has integral panels 126 and 127 which are bonded to panels 120 and 121, respectively, to form the ends, 123 and 124 being folded between them, in the completed carton as will be described.
  • the cover of the carton is formed by the top panel.
  • a latching flap 134 projects from the front cover panel 129 and has an abutment edge 135 which engages the abutment edge 119 in the latching of the cover after the carton has been opened and is then reclosed by the user, as will be explained later.
  • the segment areas are cutscored circles 136, 137, 138, 139, and 140 and function in relation to the flap 134 and abutment edge 135 in the same manner as the corresponding parts of FIG. 1.
  • Glue is applied to the blank as previously described by an applicator which applies a strip transversely across the blank over the five segment areas.
  • glue may be applied on the inside face of flap 134 (FIG.
  • the surfaces of panels 117, 120, and 121 are printed with the exception of the circular areas 136-140, and it is the glue on these areas only that is effective as an adhesive when the blank is folded as described below.
  • a suitably constructed glue wheel may be used to apply spots of glue, previous printing being then unnecessary.
  • the semi-erected carton of FIG. 17 is formed by folding the flat sheet comprising panels 117, 118, 120, and 121 along score line 114 to overlie panels 122, 123, and 124 and to partially overlie panels 125, 126, and 127. Then panels 128, 129, and 134 and flaps 130, 131, 132, and 133 are folded about score line 112 to overlie the end portion of front panel 117 as shown in FIG. 17, panel 134 being previously folded about fold line 105 and glued to the inner surface of panel 129. The outer surface of flap 134 is glued to the front panel 117 at the five circular segment areas 136-140, the glue having been applied to these areas as described in the previous paragraph.
  • the semi-erected cartons of FIGS. l7.and 18 are shipped to the user in the flat and partly pre-sealed condition shown, and the user completes the erection of the cartons as illustrated in FIGS. 19-22. During this operation he fills the cartons with his product. Both the erection and closing of the carton, and the insertion or loading of the product can be carried out on suitably modified conventional machines.
  • Panel 120 (FIGS. 19 and 21) is folded to closed position and panels 121 and 127 are spread slightly. Then the load is inserted between these flaps and against the previously folded panel 120 at the opposite end. There after, the folding of the remaining panels and fiaps at both ends, and the application of glue to certain of these flaps, takes place simultaneously, and a description of such folding at the right hand end only will be given.
  • Panel 121 is first folded downward to vertical position against the load and dust flap 124 is folded inwardly, that is, to the right over panel 121.
  • flap 132 is folded outwardly to the position of FIG. 20 and flap 133 is folded upwardly to the position shown in this figure, after which glue is applied to the inner surface of panel 127. As indicated in FIG. 20, this may be done by passing this panel while supporting it in horizontal position, beneath a glue roll 141 indicated in dot and dash lines.
  • panel 127 is folded to the vertical position (FIG. 21) and sealed against the surface of inner panel 121 and dust flap 124 A 128, the front depending dust proof seal is thus made at the bottom of the carton.
  • Flap 133 is now swung to horizontal position, flap 132 being held in its outwardly extended position and passed between a pair of glue applying rolls 142 which apply glue to both surfaces of flap 133.
  • the outer surface of panel 127 is printed except for a segment area 143 which is shown as being circular, and flap 133 is folded downwardly against the surface of panel 127 so that the glue on the inner surface of the flap adheres to the circular area 143.
  • the folding of fiap 132 over flap 133 now completes the operation, the glue on the outer surface of the flap causing them to adhere to one another.
  • the compltion of the sealing operation at the opposite end of the carton has been finished simultaneously, as previously referred to, and sealing pressure is applied by conventional means to the two opposite ends only of the carton.
  • the flap 118 will usually be left in the position shown in FIGS. 17 and 18 but if desired may be folded so that its abutment edge 119 is adjacent abutment edge 135 of flap 134 when the carton is in its semi-erected condition as shipped by the carton manufacturer.
  • the customer opens the carton by prying the front cover panel 129 outwardly so as to sever the segment areas, such as 138, 139, and shown in FIG. 22, and also pries open the two end cover panels, severing the single segment area 143 at each end.
  • the cover may then be swung open on score line 112 as a hinge.
  • the customer swings latching flap 118 outwardly so that the closing of the cover will turn it downwardly to latching position with abutmerit edge 135 on the inside of the front cover panel.
  • FIGS. 23-32 where a still further modification of the carton is illustrated.
  • An important feature of this modification is to provide a car-ton in which no out edge of the blank shows at the front of the carton.
  • Another important feature is the fact that in closing the carton only one glue wheel or glue-applying roll is required at each end of the carton.
  • a third feature is the use of a plurality of short locking tabs or flaps instead of a single long tab.
  • the blank of FIG. 23, the inner face being shown, is somewhat similar to the blanks of FIGS. 1, 10 and 16 and is formed of similar paper board.
  • This blank has a score line 144, with or without interrupted cuts, and a discontinuous 0r sectional score line 145, and also score lines 146, 147, 148, 149, and 151.
  • Panel 152 forms the front of the carton. Projecting from the edge of this panel are two spaced locking flaps 153, each having an abutment edge 154. These flaps can be used in the same manner as the single locking fiap 17 of FIG. 8 and flap 113 of FIG. 17. Also the single locking flap may be used on the blank of FIG. 23, if desired.
  • Locking flaps 153 are spaced apart leaving a central space between them the material of which is added at the opposite end of the blank, as will be presently described.
  • the panels 155 and 156 are integral with front panel 152.
  • Panel 157 forms the bottom of the carton and sealing flaps 158 and 159 are integral with the bottom 157 and serve to make a tight seal for the bottom edges, as shown in FIG. 29 and as will be apparent later on.
  • Panel 160 forms the back of the carton and has integral panels 161 and 162 which are to be bonded to panels 155 and 156 respectively to form the ends of the carton, the sealing flaps 158 and 159 being folded between them in the completed carton, as will be described.
  • the cover of the carton is formed by the top panel 163, the front depending panel or extension 164 and end flanges which are formed by curved sealing flap 165 and rectangular flap 166 at one end and by curved sealing flap 167 and rectangular fiap 168 at the opposite end (see FIGS. 23 and 30).
  • a flap 169 projects from front cover panel 164, but because of the provision of the two spaced 9 locking flaps 153 it has two abutment edges 176' which are properly located to be engaged by the latching flaps 153 in the latching of the cover when the filled carton is opened and reclcsed by the user.
  • flapv 169 between the abutment edges 170 is widened by the addition to the blank of the material on the next blank corresponding to the central space previously referred to between the two latching flaps 153. This is advantageous as it renders fiap 169 easier to fold along the score line 144. Should single locking flaps be used, such for example as flap 118 in FIG. 16, flap 169 will not be widened at its central portion and a single abutment edge in line with edges 170 will be used.
  • segment areas are cut-scored circles 171, 172 and 173 and function in relation to the flap 169 and abutment edge 170 in the same manner as the corresponding parts of FIGS. 1 and 17. It will be understood that any suitable number of these segment areas may be used, and
  • glue is applied over the segment areas 171-173 it may also be applied on the inner or top face of flap 169.
  • the surfaces of panels, 152, 155 and 156 are printed with the exception of the circular areas 171173, and it is the glue on these areas only that is effective as an adhesive.
  • a suitably constructed glue wheel may be used for the purpose of applying spots of glue at the locations of the circular areas 171-173, and in that case prior printing of the blank is unnecessary.
  • the folding of the blank of FIG. 23 to form a semierected carton in flat condition is carried out by folding the. flat sheet comprising panels 152, 153, 155 and 156 along score line 149 through about 180 to overlie panel 157 and extended flaps 158 and 159', and to partially overlie panels 160, 161 and 162.
  • the panels 163- and 164V and extended flaps 165, 166, 167 and 168 are folded about score line 147 to overlie the end portion of front panel 152 in a manner similar toy that shown in FIG. 17, panel 169 having been previously folded about fold line 144 and glued to the inner surface of panel 164.
  • the outer surface of flap 169 is glued to the front panel 152 at the three circular segment areas 171-173, the glue having been applied to these areas, as described in the preceding paragraph.
  • the cartons are shipped to the user in the flat and partly pre-sealed condition just described, the same as in the case of the forms of the invention shown in FIGS. 2 and 3, 11, l2, l7 and 18, and the user completes the erection of the cartons, as illustrated in FIGS. 24 to 28. During this operation he fills the carton With his product. Both the erection and closing of the carton and the loading of the product can be carried out on suitably modified conventional machines.
  • Panel 161 at the left (FIG. 24) is folded upwardly to closed. position, and the load is insertedbetween panels 156and 162 at the opposite end and against the 16 folded panel 161. After this the folding of the remain ing. panels and flaps at both ends of the carton and the application of glue take place simultaneously at both ends of the carton, and a description thereof more particularly for the right-hand. end, will be given.
  • Panel 162 is first folded upwardly to vertical position against the load. Inasmuch as the flap 159 and curved flap 167 project in the planes of their respective panels 157 and 163 difiiculty has been experienced through the engagement of the end portions of panel 162 with the edges of these two flaps. This difiiculty has now been avoided by concavingthe end edges of flap 162 (and also flap 161) at the opposite end as indicated at 178. Flaps 159 and 167 are. next folded inwardly. The presence of the square edges 159a on flaps 158 and 159 (FIG. 23) is advantageous in providing stability and in maintaining the box in square condition. Glue is applied to the inner surface of panel. 156 and to a portion of the inner surface of flap 168 while both of these members remain in extended position. This may be done by passing this flap and panel over a glue roll 174 (FIG. 26).
  • the corners of panels and 156 are cut away in a special manner having additional advantages. These corners have a somewhat different configuration. As shown in FIG. 23 the corners of these two flaps are cut away on a 45 line 176 for about one third of the. panel width, thence along a steeper, or curved, line to a small notch or shoulder 176a, and then continuing to the panel edge in a straight edge 175 at right angles to the outside edge of the panel.
  • Each of the rectangular cover end flaps 166 and 168 which, with sealing flaps and 167 form the end flanges of the cover, may be provided with a small projection in the form of a lobe or ear a (FIG. 23). These lobes serve the important purpose of controlling and maintaining correct position and alignment of flaps 1 66, 168 with respect to the panels 155, 156 and with the top panel 163 of the cover in the final sealing of the carton as now will be described.
  • the lobes 175a support the fiaps 166 and 168 in the horizontal plane of the extending panels 155 and 156..
  • sup porting rails not' shown.
  • the flaps 166, 168 pass beyond the ends of such rails suitably designed plows (or other mechanisms) sharply depress the flaps 166 and' 168 so that they snap past their respective points of lobe support.
  • the edges of the lobes, particularly their outer edges, are shaped as cams to facili+ tate this action.
  • the carton next passes between glue rolls, one of which is shown at 174 (FIG. 26), which apply adhesive, as previously mentioned, to the exposed underside areas of the flaps 166 and 168 not maskedby the uncut-away areas of the panels 155 and .156, and to the entire remaining underside area-s of these panels With adhesive thus applied, the flaps 166 and 168 and the panels 155 and 156 are plowed downwardly in unison against the previously up-folded. panels 161 and 162 11 and the thereover in-folded sealing flaps 165, 167 and 158, 159 respectively. The flaps 166, 168 are thus bonded to the sealing flaps 165, 167 respectively, but are not bonded to the surrounding exposed areas of the underlying panels 161, 162 which areas have been printed to prevent such bonding.
  • cover end fiaps 166, 168 are not bonded at any point to the panels 161, 162, their lower edges would be free to flare outwardly were it not for the lobes 175a which, despite no adhesive, hold the lower edges of these flaps neatly, firmly and close to the rear corners of the carton, yet leaving the sides of the assembled cover otherwise un-secured and free to open when the front seal (spots 171-173) of the cover is broken.
  • the cover can be tilted upwardly as shown in FIG. 30 without hindrance from the lobes 175a. Upon reclosure of the: cover these lobes will remain on the exterior surfaces of the respective ends of the carton.
  • FIG. 25 shows flap 168 raised to expose the triangular area mentioned. If desired, however, this notch 176a may be omitted and the outline of the cut-away portion of the panel made as shown in the modified form of FIG. 32. In this form the 45 line 176 joins a steeper line 177 the outer end of which connects with the straight right-angled edge 175.
  • Another feature of the present construction is the cutting of short angular slits 180, 181, 182 and 183 in panels 161 and 162. These slits extend inwardly from the bases of panels 161 and 162 (FIG. 23), that is, from the respective fold lines 150 and 151. This places one of the slits near each corner of rear panel 160. The purpose of these slits is to obtain tight joints at both the bottom and top of the box, and they function as follows:
  • Slit 181 is at the top of the box (FIGS. 26 and 30) and slit 183 at the bottom (FIG. 26).
  • flap 168 and panel 156 are folded downwardly after having received the glue on their undersurfaces, they are pressed against the surfaces of the respective curved flaps 167 and 159 which have previously been folded inwardly against panel 1152.
  • the presence of the slits permits the lower ends of flaps 167 and 159 to be pressed inwardly to a slight extent flexing the material of panel 162 in contact with these flaps and thereby bringing the outer surfaces of the lower ends of these flaps into the same plane as the outer surface of panel 162 on the opposite sides of and adjacent the respective slits 181 and 183.
  • Flap 159 is shown in the position it will occupy after panel 156 has been folded to closed position. That is to say, the outer surface of the right end portion 184 of this flap is shown in the sarne plane as the narrow portion 185 of panel 162 between slit 183 and the corner of the box.
  • each of these four flaps 158, 159, 165 and 167 advantageously is formed with a straight edge 186 at least as long as the length of the adjacent slit. This prevents the possibility of the edge of the flap depressing the area of the panel on the opposite side of the slit such, for example, as area 185 in FIG. 29.
  • the angle of the edges 186 of flaps 158, 159, 165 and 167 with respect to fold lines and 151 may be varied as desired, but advantageously these edges are placed at about 45 to the fold lines.
  • the angle of the slits 180-183 with respect to fold lines 150 and 151 is made slightly less than the angle of the edges 186 in order to reduce or eliminate the possibility of edges 186 overlapping their adjacent slits and overlapping onto areas 185.
  • latching flaps 153 (FIG. 30) are shown bent outwardly so that when the cover is reclosed by the user they will be folded downwardly to provide the latching engagement between these abutment edges 154 and the abutment edges 170 of folded flap 169 which extends along the front panel of the cover. It will be understood that latching flaps 153 may, when the carton is in its semi-erected state, extend upwardly in a position corresponding to flap 17 of FIG. 2 or to flap 71 of FIG. 12.
  • An important feature of the present invention which is common to all of the embodiments described above is that of the cut-away corners of the end-sealing panels (see panels 20 and 21 of FIG. 1, 73 and 74 of FIG. 11, 120 and 121 of FIG. 16 and 155 and 156 of FIG. 23). This feature has important advantages both in the manufacture of the semi-erected carton and in the subsequent formation or erection of the box and the sealing thereof.
  • the cut-away corners enable the glue to be applied, in the sealing of the filled box, in one pass over a single glue wheel at each side of the carton, so as to bond not only the box end sealing flags, but also just the desired limited areas of the cover end flaps where this is intended.
  • a carton accordinging to claim 1 wherein the slits are of the order of one-half inch in length and disposed at an angle of about 45 with the rear wall of the carton.
  • a carton formed of a single blank rectangular panels for forming the front, back, end and bottom walls, and a cover panel hinged to the back panel and having a cover front-forming extension and cover end-forming members extending therefrom which telescope over the front and end panels of the carton
  • sealing flap extensions on said cover and bottom panels the end panels projecting from the front and back Walls being foldable to form the ends of the carton, the panels projecting from the back wall being folded to form the inner layers of the end walls, the bottom sealing flaps being folded thereover and the panels projecting from the front carton Wall being folded over both the bottom sealing flaps and the respective inner layers and being glued thereto, characterized by the fact that the opposite edges of the panels projecting from the back wall are made in concave shape so that in folding these panels they will not engage the edges of the unfolded sealing flaps.
  • a carton formed from a blank having ractanglar panel member for forming the front, back, end and bottom walls, and a cover panel hinged to the back panel, the end panel members projecting from the front and back walls and being foldable to form the ends of the carton with the panel members projecting from the back wall forming the inner layer of the end walls, the cover panel having a front-forming extension and cover endforming members extending therefrom arranged to telescope the front and ends of the carton when the cover is in closed position, the cover end-forming members and the panel members projecting from the front wall being foldable to form respectively the outer layer of the end walls and the cover ends, sections of the adjacent edges of these two members at each end of the carton being positioned in abutting relationship, and projecting means on one of said abutting members engaging the opposite member so as to prevent misalignment of said abutting members during folding to form the completely erected carton.
  • a carton blank according to claim 5 wherein the projecting means is in the form of an ear and projects from the lower outer corner of each of the cover end members, said ears, in the filled and closed carton, underlying the adjacent marginal edge portion of each of the outer end wall members.
  • a carton blank according to claim 6 wherein the projecting means is in the form of an ear having a sloping cam edge to facilitate the shifting of the ear to the inner surface of the panel member projecting from the front wall.
  • a carton formed from a blank'having rectangular panel members for forming the front, back, end and bottom walls, and a cover panel hinged to the back panel,
  • the end panel members projecting from the front and back walls and being foldable to form the ends of the carton with the panel members projecting from the back wall forming the inner layer of the end walls
  • the cover panel having a front portion and end members arranged to telescope the front and ends of the carton when the cover is in closed position, the cover end members and the panel members projecting from the front wall being foldable to form respectively the outer layer of the end walls and the cover ends, sections of the adjacent edges ofthese two members at each end of the carton being positioned in abutting relationship, projecting means adjacent the lower corner of one of said abutting members to prevent misalignment of the abutting members during folding to form the completely erected carton, and projecting means disposed on the panel member which forms the outer layer of the end wall, such projecting means being engaged with the inner surface of the 'cover and flap so that folding pressure applied to such flap will also serve to fold the panel member forming the outer layer.

Description

Jan. 15-, 1963 L M. l. WILLIAMSON 3,
SEMI-ERECTED CARTON Filed March 3. 1959 8 Sheets-Sheet 1 INVENTOR. MARSHALL l. WILLIAMSON ATTORNEYS 73M, ZwMwa/M AMT/ l Jan. .15, 1963 M. WILLIAMSON 3,073,501
SEMI-ERECTED CARTON Filed Mai'ch :s, 1959 8 Sheets-Sheet 2 FIG. 5
INVENTOR.
MARSHALL I. WILLIAMSON Y P ZZ flJ/I/A an .77 0
11 TTORNEYS Jan.'15, 1963 M. I. WILLIAMSON SEMI-ERECTED CARTON 8 Sheets-Sheet 3 Filed March 3, 1959 FIG.
INVENTO ,1 MARSHALL I. wp uAMsoN BY Qu -t, a
mmmX/w,
ATTORNEYS Jan. 15, 1963 M. WILL'IAMSON SEMI-EERECTED CARTON 8 Sheets-Sheet 4 Filed March 3, 1959 FIG. l4
9/? ATTORNEYS INVENTOR MARSHALL I. W| LLI A MSON Jan. 15, 1963 M. I. WILLIAMSON 3,073,
SEMI-ERECTED CARTON Filed March 3, 1959 8 Sheets-Sheet 5 INVENTOR MARSHALL l. WILLIAMSON BY WWI- aw ATTORNEYS Jan. 15, 1963 M. l. WILLIAMSON- SEMI-ERECTED CARTON Filed March 3. 1959 8 Sheets-Shet 6 INVENTOR MARSHALL I. WILLIAMSON BY FM (M m ATTORNEYS Jan. 15, 1963 M. WILLIAMSON SEMI-ERECTED CARTON 8 Sheets-Sheet 8 Filed March 3, 1959 INVENT'OR MARSHALL I. WI LLIAMSON BY wma,-M M 1 vATTORNEYS Patented Jan. 15, 1963 3,073,501 SEMI-ERECTED CARTON Marshall I. Williamson, Oradell, N.J., assignor to Federal Paper Board Company, Inc., Bogota, N.J., a corporation of New York Filed Mar. 3, 1959, Ser. No. 796,813 14 Claims. (Cl. 22916) This invention relates to cartons formed of paper board, or related sheet stock, of the type having a reclosable cover hinged to a box part and adapted to telescope over the open end of the box part, and has for its object the provision of an improved carton of this type, particularly a carton having a sealed reclosable cover with releasable locking means such as the type widely known as the KLIKTOP, and a process comprising a sequence of operations or steps in forming the carton.
The invention provides a semi-erected carton, which is in a state of erection intermediate between the blank state and the filled and completed carton. The blank usedin forming the carton consists of a single sheet of paper board of suitable weight and toughness having cuts and fold lines by means of which it can be formed into a carton having rectangular sides, ends, bottom and means for forming the cover. In forming the semierected carton of the elevation, the flat blank partly is glued and folded into a flat position in which state it is distributed to the user for complete erection filling with goods andgluing.
It is one of the important features of the invention that in the semi-erected carton the means on the. cover for effecting the latching of the. cover to the front panel is attached; as with adhesive, or is otherwise secured or connected, to the front panel of the carton in the position it occupies in the completed carton.
In one aspect of the invention, the latching means on the cover is formed from a flap which is folded back in the contiguous cover panel and secured in that position to form a reinforced cover panel having an inner abutmentv edge which engages an abutment edge of a hinged abutment flap on the front panel of a carton. This reinforced part of the cover is secured as by glue or other connection to the front panel of the carton in the semi-erected state.
In one form of the invention, also, the front panel of the carton has. at least one nearly cut out segment area, and may have a few nearly cut out segment areas, to which the folded back latching flap of the cover is attached by glue. The carton cover is opened by prying it away from the front panel which causes the segment area or areas to be torn from the front panel and, because they are glued to the folded-back part of the cover, they remain there. The segment area or areas may be cut partly through the thickness of the paper in which case only a layer of each segment will be peeled off and retained on the folded-back part. It is preferred, to print theflat blank and to omit the ink from the segmentareas so that the glue will stick to them and not to the surrounding printed surface, but, if desired, spots of glue may be applied by the glue. wheel. These segment areas preferably-have straight edges which are arranged to be transferred in edge contact and alignment with the inner abutment edge of the cover folded back flap.
In a variation of the invention, the folded back portion of the cover closure or flap. is. omitted and the, inner face of the cover panel is glued directly over the front panel having the cut segment area or areas. These. segment areas are, so nearly completely out out that they become attached to the cover and transferred to the front panel of the cover when the cover is opened to provide the closure abutment edges.
In any of the various forms of the invention the prying away of the cover from the front panel, or the front panel from the cover, severs the connection between them.
The partly erected carton of the invention can be changed from its fiat folded semi-erected position to a box-like position having the ends open, either by hand or by machine, and the goods can be inserted through either open end. When the carton is filled with merchandise, some of the panels are folded into position, glue is applied to two of the opposite end panels and cover flaps, and the end panels and cover flaps are folded into position and glued together. One of the important features of this invention is that it provides a Kliktop type box that can be formed, and completely sealed, including the cover, entirely by mechanical means. The weakly sealed cover closure part canbe opened easily, by -the user and thereafter opened and closed repeatedly.
These and other novel features of the invention will bebetter understood after considering the following discussion taken in conjunction with the accompanying drawings in which: I I a 1 FIG. 1 is a plan view of a paper board blank which has been cut and scored for forming a carton of the: invention;
FIG. 2 is a plan view of a semi-erected carton in flat position formed of the blank of FIG. 1;.
FIG. 3 is an end view of the carton of FIG; 2 showing in full lines an intermediate position to illustrate the arrangement-of FIG. 2, and in broken lines with the front and back panels andthe bottom andcove'r panels in parallel positions, and with the ends open in the pdsition for filling with merchandise;
FIG. 4 is a perspective of the top erected carton with parts removed;
FIG. 5 is a sectional view at 5-5 of FIG. 4;
FIG. 6 is a view similar to that of FIG. 4 with the cover open; I 2
FIG. 7 is a cross-sectional view similar to section 5-5 of FIG. 4,. but with the carton cover partly open;
FIG. 8 is a perspective view of the top portion of a modification of the fully erected carton;
FIG. 9 is a cross-sectional view of FIG. 8, FIG. 5 but with the cover open;
FIG. 10 is a plan view of a modification of paper board blank which has been out and scored for forming a carton of the invention;
FIG. 11 is a plan view of a semi-erected carton in fiat position formed of the blank of FIG. 10-;
FIG. 12 is an end view of the cartonof FIG. 11. show ing in full lines an intermediate position to illustrate the arrangement of FIG. IL, and in broken lines with the front and back panels and the bottom and cover panels in parallel positions, and with the ends open in the position for filling with merchandise;
,7 FIG. 13 is'a perspective of the semi-erected cartoriof FIGS. 11 and 12 when filled with merchandise, the inner end panels and flaps folded into position and: the projectflaps ready for glue;
portion of the fully similar to ing end panels and the attached 'FIG. 14 is a view of the carton of FIG. 13 in the position for application of glue to the extendingpan'els;
FIG. 15 is a perspective of the completely erectedcar ton. of FIG. 14, after the panels and flaps have been glued into position;
FIG. 16 is a plan view of another modification of paper board blank which has been cut and scored for forming a carton of. the invention;
FIG. 17 is a plan position formed'of theblank of FIG. 16;?
FIG. 18 is an end view of the carton of FIG. lTshow ing in r n lines an intermediate position to illustrate the view of a semi erecte'd cartonin fiat arrangement of FIG. 17, and in broken lines with the front and back panels and the bottom and cover panels in parallel positions, and with the ends open in the position for filling with merchandise;
FIG. 19 is a perspective view of the semi-erected carton 'of FIGS. 17 and 18 ready to be filled with merchandise;
FIG. 20 is a fragmentary perspective view of the carton of FIG. 19 after filling and showing the application of glue to one of the panels;
FIG. 21 is a view similar to FIG. 20 showing the application of glue to a flap;
- FIG. 22 is a perspective view of the filled and completely closed carton.
FIG. 23 is a plan view of still another modification of paper board blank which has been cut and scored for forming a carton of the invention;
ing a detail;
FIG. 28 is a perspective view of the filled and completely closed carton;
FIG. 29 is a further fragmentary perspective view of a detail;
FIG. 30 is a fragmentary view of the upper portion of the carton after the initial opening and before reclosing;
FIG. 31 is a fragmentary perspective view illustrating a detail shown in FIG. 30; and
FIG. 32 shows a modification of another detail. The blank shown in FIG. 1 is formed of stiff paper board and the face showing will be 'on the inside of the completely erected carton. For reasons which are important in gluing the panels to minimize warping, the grain of the fibers extends in the lengthwise direction of the blank. The blank has score lines 1 and 2 with or without interrupted slits, cuts 3, 4, 5, 6, 7 and 8, and score lines 9, 10, 11, 12, 13 and 14.
The panel 15 formsthe front of the carton. The flap 17 has an abutment edge 18 and can assume either the position of FIGS. 4 and 5, or FIGS. 6 and 7 when the carton is first completed and before use by the customer. The panels 20 and 21 are integral with panel 15 and form the outer ends of the carton. The panel 22 forms the bottom and the dust flaps 23 and 24 are integral with the bottom and are turned upwardly inside the carton as part of the ends.
The panel 25 forms the back of the carton and has integral panels 26 and 27 which are bonded to panels 20 and 21 to form the ends when the carton is completely erected. The upper ends of panels 26 and 27 have flaps 30 and 31 that are bent inwardly to extend over the upper open top of the carton as shown in FIG. 6 to stiffen the carton during gluing.
The cover structure consists of a central top panel 32 and a depending front or latching panel 33 and two end panels 34 and 35 which, when arranged as in FIGS. 4 to 9, form the telescoping or exterior depending end portions of the cover. The glue flaps 36 and 37 are folded over and glued to the cover panel 32 as shown in FIGS. 4 and 8. The latching flap 38 may be used as in the modifications shown in FIGS. 4 and 5, or omitted as in the modification shown in FIGS. 8 and 9. Flap 38 is folded over and glued to the panel 33 to provide the inside abutment edge 39 as shown in FIGS. 5, 6 and 7.
The semi-erected carton shown in FIGS. 2 and 3 is formed of the blank of FIG. 1 by folding the front panel 15 and end panels 20 and 21 on score line 12 to overlie panels 22, 23 and 24, and to partly overlie panels 25, 26 and 27.
End panels 20 and 21 have their corners cut off diagonally, as shown in FIG. 1, and a glue strip is applied transversely to pass over the triangles 40, 41 and 42 which are cut in the top of front panel 15. The entire surfaces of panels 20, 21 and 15 are printed, with the exception of the triangular areas 40, 41 and 42, and the glue is eflfective only in these areas.
Panels 32, 33, 34 and 35, and glue flaps 36 and 37 are folded along score line 10 to overlie the end portion of panel 15, as shown in FIG. 2, and panel 33 and flap 38, which has been folded and glued to its inner surface, are pressed against the glue on triangular areas 40, 41 and 42, thereby sealing the carton in its semi-erected position, as shown in FIG. 2. During the application of the glue strip by which adhesive is placed on the triangular areas 40, 41 and 42, the diagonal edges of the cut-off corners may touch the glue wheel. These edges, however,
'are now masked by panels 34 and 35 so that when the semi-erected cartons are stacked they will not adhere to one another.
FIG. 3 shows the panels spread apart in full lines for clarity and it will be noted that the panels and flaps 17, 20, 21, 23, 24, 26, 27, 30, 31, 34 and 35 are left in their extended flat positions so that when the carton assumes the position shown in broken lines the opposite ends are open.
As shown in FIGS. 2 and 3, the inside surface of flap 38 is glued to the triangles 40, 41 and 42 in such position that the edges 43, 44 and 45 of the triangles are coincident with the aubtment edge 39. This increases the thickness of the abutment edge when the cover is opened and the triangles are transferred to the flap 38 providing a better locking engagement with the abutment edge 18.
The flap 17 which carries the abutment edge 18 may be left extended as in FIG. 2 in which case it will occupy the inwardly extending position shown in FIGS. 4, 5 and 8 in the completed carton. In order for this flap to form a locking engagement with flap 38, so that abutment edges 18 and 39 are in locking contact, which is a characteristic of the so-called Kliktop cartons, flap 17 must be bent forward and downward. When the carton is opened by the purchaser, the flap 17 is bent outwardly in removing the goods to the position shown in FIG. 7 and when the cover is closed, the flap is pressed downward to its locking position. However, the flap 17 may be bent to this locking position prior to forming the semi-erected carton of FIGS. 2 and 3.
The blank of FIG. 1 and the semi-erected carton as shown in FIGS. 2 and 3 do not have the glue applied on the shaded areas shown when the blank is flat. These areas are shaded to show where the glue will eventually be applied. The glue is applied on panels 20, 21, 34, 35 and flaps 36 and 37 after the carton has been erected to the position shown in broken lines in FIG. 3, and filled with merchandise.
As shown in FIG. 3, in full lines, the panels have been displaced from the flat semi-erected position merely for clarity of illustration. This semi-erected carton may be changed from the flat position to the erected loading posi tion shown in broken lines in FIG. 3 by applying pressure in the direction of the arrows, and this may be done by a machine. When in this erected position, the ends are open for filling and this may also be done mechanically. The filled carton with the panels extending outwardly is passed through a glue applicator to apply the glue to the areas shown in the shaded areas of FIG. 1 as will be explained in the description of FIGS. 13, 14 and 15. The small glued areas on the panels 34 and 35 are for sealing these panels to only small areas of panels 26 and 27 near the hinge or fold line 10 of the cover. It will be noted that the corners of panels 20 and 21 are cut off diagonally and that when flaps 34, 35, 36, and 37 are folded over to the position shown in FIG. 2, in which position the glue is applied as shown in FIG. 14, that panels 20 and 21 mask the unglued parts of flaps 34 and 35 whereas the diagonal cuts permit the application of glue to the small areas of flaps 34 and 35. After the glue has been applied, the glued panels and fiaps are folded and pressed into their glued position shown in FIG. 8 by mechanical means now available.
The customer opens the cover by prying apart the panels 33 and thereby tearing the triangles from the panel 15. Then the cover may be limited in the usual way. The cover can be opened and reclosed repeatedly with abutment reengagement and release at each closing.
The blank of FIG. 1 may omit the flap 38 in which case the inner surface of panel 33 is glued directly to the triangles 4t), 41 and 42 when forming the semi-erected carton of FIGS. 2 and 3. The edges 43, 44 and 45 of the triangles become the abutment edge of the cover to engage the abutment edge 18 of the flap 17 as shown in FIGS. 8 and 9.
The blank shown in FIG. 10 is generally similar to the blank of FIG. 1 and is formed of similar paper board. The blank has score lines and 51, with or without interrupted cuts, cuts 52, 53, 54, 56, 57, 58 and 59, and score lines 61, 62, 63, 64, and 66.
The panel is the front of the carton, the flap 71 has an abutment edge 72 and can be used in the same manner as flap 17 of FIG. 1. The panels 73 and 74 are integral with panel 70 and form the outer ends of the carton. Panel 75 forms the bottom of the carton and the glue flaps 76 and 77 are for sealing the bottom edges as shown in FIG. 15. The dust flaps 80 and 81 are integral with bottom 75 and are turned up inside the carton.
The panel 82 forms the back of the carton and has integral panels 83 and 84 which are bonded to panels 73 and 74, respectively, in the completed carton to form the ends. The small flaps 85 and 86 are folded inwardly in the completed carton and serve mainly to stiilen the carton during erection and gluing.
The cover of the carton is formed of the top panel 87, the front depending cover panel 88, and panels 89 and 90, glue flaps 92 and 93, and latching flap 94 having an abutment edge 95 which engages the abutment edge 72 in the latching of the cover. The triangles of the form shown in FIGS. 1-9 have been replaced by a single continuous, narrow cut-scored segment area 96 having an edge 97 which functions in relation to the flap 94 and abutment edge 95 in the same manner as the corresponding parts of FIG. 1.
The glue is applied to the blank in the manner previously described by an applicator which applied a strip transversely across the blank over the area 96 before panels 87, 88, 89 and 9t} and glue flaps 92 and 93 have been folded along score line 62 to the position shown in FIG. 11. At the same time glue may be applied to the inside face of flap 94 (the face shown in FIG. 10). The surfaces of panels 70, 73 and 74 are printed with the exception of area 96 and it is only the glue on this area that is etfective as an adhesive.
If desired, the segment area 96 may consist merely of a strip of glue, the cut-scoring being omitted. Such strip of glue will be sufficiently narrow so that it can be broken by prying apart from the front panel 70 of the carton the front cover panel 88 to which flap 94 has been glued.
The semi-erected carton of FIG. 11 is formed by folding flap 94 over on cover panel 88 and then folding panels 76, 71, 73 and 74 along score line 64, 180 into contact with panels 82, 83 and 84, thereby gluing flap 94 to panel 88 and panel 88 to the segment area 96. Again, should glue have been received on the edges of the blank by the applicator which applied the glue strip over area 96, such undesirably glued portions have now been masked by the panels 89 and 96. This prevents such glue from contacting adjacent blanks or semi-erected cartons when they are stacked. The latching flap 94 may be used or not as in FIG. 1, but when used it is folded over and glued to the inside. of panel 8 8'. When not used, the front panel 88 becomes glued to the segment area 96. Then the cover panels and flaps are folded along score line 62 to the position shown in FIG. 11 and the inner face of fiap 94 is pressed into glued contact with the segment area 96, securing the carton in its semi-erected position.
FIG. 12 shows in full lines the carton in a partly opened condition merely to illustrate the arrangement of the parts, and in broken lines, to show the position it assumes when mechanically pushed in the direction of the arrows to the position for mechanically filling with merchandise through the open ends.
FIG. 13 shows the carton after it has been filled and after the flaps 85 and 86 have been turned in, flaps 80 and 81 have been :folded in and the panels 83 and 34 folded in over them. In this state of erection, the panels and [ flaps 89, 92, 73 and 76 on one end, and the panels and flaps 90, 93, '74 and 77 on the opposite end are left extending outwardly in their original fiat positions of FIG. 11. The panels 73 and 74 partly mask the end panels 89 and 90, the diagonally cut ofi corners leaving parts of these panels exposed for the application of glue by the glue wheels.
FIG. 14 shows a more advanced step in the sequence of operations with the carton of FIG. 13 being carried on a conveyor 102 with the extended flaps and panels passing over the glue wheels 103 and 104, to apply glue to the areas for completely sealing the cart-on. In the next mechanical operation the panels 73 and 74 are pressed into glued contact with panels 83 and 84 and 89 and 90, respectively. Then the glue flaps 76 and 77 and the glue flaps 9'2 and 93 are bent over and pressed into glued contact with the bottom panel 75 and the top panel 87, respectively, thereby completely finishing the carton.
To open the carton, the customer price the front cover panel 88 outwardly, breaking the connection of the segment area 96 with the front panel 70, and the cover can be lifted open and swung on score line 62 as a hinge. When a strip of glue is used instead of segment area or cut-scored area 96, the prying of cover panel 88 severs such glue strip. When the cover is closed, the abutment edges 72 and 95 function in the manner characteristic of Kliktop cartons.
The sequence of operations informing the carton. of the invention comprises the cutting and creasing of the blanks, folding them to form the semi-erected cartons of FIGS. 2 and 11 with the front part of the cover in glued contact with the front panel, the mechanical spreading of the parts as in FIGS. 3 and 12 to arrange the carton in position with open ends for filling with merchandise, the folding of flaps and panels for the sides inwardly while leaving the flaps and panels as in FIG. 13 for glue =applioation, the application of glue as in FIG. 14 and the final closing of the glue panels and glue flaps to (form the carton of FIG. 15.
The triangles 40, 41 and 42 of FIG. 2 are a convenient means of providing removable glued sections to reinforce or to provide abutment edges. Other shaped areas may be used which will provide abutment edges, such as rectangles, circles or semicircles.
In FIGS- 16-22 there is illustrated a further modification of the carton. The blank shown in FIG. 16 is somewhat similar to the blank of FIG. 1 and is formed of similar paper board. The blank has score lines 105 and 106, with or without interrupted cuts, cuts 107, 108, 109, and 1-10, and score lines 111, 112, 113, 114, 115,, and 116.
The panel 117 forms the front of the carton. The flap 118 has an abutment edge 119 and can be used in the same manner as. flap 17 of FIG. 1. The panels 120 and 121 are integral with panel 117. Panel 122 forms the bottom of the carton, and dust flaps 123 and 124 which are integral with the bottom 122 serve to make a tight seal for the bottom edges as. shown in FIG. 21, and will be apparent later on.
. Panel 125 forms the back of the carton and has integral panels 126 and 127 which are bonded to panels 120 and 121, respectively, to form the ends, 123 and 124 being folded between them, in the completed carton as will be described. V
The cover of the carton is formed by the top panel.
the dust flaps panel 129, and end panels which are formed by flaps 130 and 131 at one end and by flaps 132 and 133 at the opposite end (see FIG. 22). A latching flap 134 projects from the front cover panel 129 and has an abutment edge 135 which engages the abutment edge 119 in the latching of the cover after the carton has been opened and is then reclosed by the user, as will be explained later. The segment areas are cutscored circles 136, 137, 138, 139, and 140 and function in relation to the flap 134 and abutment edge 135 in the same manner as the corresponding parts of FIG. 1.
Glue is applied to the blank as previously described by an applicator which applies a strip transversely across the blank over the five segment areas. At the same time, glue may be applied on the inside face of flap 134 (FIG. The surfaces of panels 117, 120, and 121 are printed with the exception of the circular areas 136-140, and it is the glue on these areas only that is effective as an adhesive when the blank is folded as described below. If desired, a suitably constructed glue wheel may be used to apply spots of glue, previous printing being then unnecessary.
The semi-erected carton of FIG. 17 is formed by folding the flat sheet comprising panels 117, 118, 120, and 121 along score line 114 to overlie panels 122, 123, and 124 and to partially overlie panels 125, 126, and 127. Then panels 128, 129, and 134 and flaps 130, 131, 132, and 133 are folded about score line 112 to overlie the end portion of front panel 117 as shown in FIG. 17, panel 134 being previously folded about fold line 105 and glued to the inner surface of panel 129. The outer surface of flap 134 is glued to the front panel 117 at the five circular segment areas 136-140, the glue having been applied to these areas as described in the previous paragraph. Again should glue have been received on the edges of the blank by the applicator which applied the glue strip over circular areas 136-140 such undesirably glued edges have now been masked by the panels 131 and 133. Thus such glued edges are prevented from contacting adjacent blanks or semi-erected cartons when they are stacked.
As with the forms shown in FIGS. 2-3 and 11-12, the semi-erected cartons of FIGS. l7.and 18 are shipped to the user in the flat and partly pre-sealed condition shown, and the user completes the erection of the cartons as illustrated in FIGS. 19-22. During this operation he fills the cartons with his product. Both the erection and closing of the carton, and the insertion or loading of the product can be carried out on suitably modified conventional machines.
After squaring up a carton as illustrated in FIG. 18 and as described previously in connection with the other forms of the invention, the panels and flaps at its opposite ends are manipulated to close and seal the carton in substantially the following sequence:
Panel 120 (FIGS. 19 and 21) is folded to closed position and panels 121 and 127 are spread slightly. Then the load is inserted between these flaps and against the previously folded panel 120 at the opposite end. There after, the folding of the remaining panels and fiaps at both ends, and the application of glue to certain of these flaps, takes place simultaneously, and a description of such folding at the right hand end only will be given.
Panel 121 is first folded downward to vertical position against the load and dust flap 124 is folded inwardly, that is, to the right over panel 121. Next flap 132 is folded outwardly to the position of FIG. 20 and flap 133 is folded upwardly to the position shown in this figure, after which glue is applied to the inner surface of panel 127. As indicated in FIG. 20, this may be done by passing this panel while supporting it in horizontal position, beneath a glue roll 141 indicated in dot and dash lines. After this glue application, panel 127 is folded to the vertical position (FIG. 21) and sealed against the surface of inner panel 121 and dust flap 124 A 128, the front depending dust proof seal is thus made at the bottom of the carton.
Flap 133 is now swung to horizontal position, flap 132 being held in its outwardly extended position and passed between a pair of glue applying rolls 142 which apply glue to both surfaces of flap 133. The outer surface of panel 127 is printed except for a segment area 143 which is shown as being circular, and flap 133 is folded downwardly against the surface of panel 127 so that the glue on the inner surface of the flap adheres to the circular area 143. The folding of fiap 132 over flap 133 now completes the operation, the glue on the outer surface of the flap causing them to adhere to one another. The compltion of the sealing operation at the opposite end of the carton has been finished simultaneously, as previously referred to, and sealing pressure is applied by conventional means to the two opposite ends only of the carton.
The flap 118 will usually be left in the position shown in FIGS. 17 and 18 but if desired may be folded so that its abutment edge 119 is adjacent abutment edge 135 of flap 134 when the carton is in its semi-erected condition as shipped by the carton manufacturer. When the carton is filled with flap 118 extending upwardly as shown in FIGS. 17 and 18, the customer opens the carton by prying the front cover panel 129 outwardly so as to sever the segment areas, such as 138, 139, and shown in FIG. 22, and also pries open the two end cover panels, severing the single segment area 143 at each end. The cover may then be swung open on score line 112 as a hinge. Before re-closing, the customer swings latching flap 118 outwardly so that the closing of the cover will turn it downwardly to latching position with abutmerit edge 135 on the inside of the front cover panel.
Consideration will now be given to FIGS. 23-32 where a still further modification of the carton is illustrated. An important feature of this modification is to provide a car-ton in which no out edge of the blank shows at the front of the carton. Another important feature is the fact that in closing the carton only one glue wheel or glue-applying roll is required at each end of the carton. A third feature is the use of a plurality of short locking tabs or flaps instead of a single long tab.
The blank of FIG. 23, the inner face being shown, is somewhat similar to the blanks of FIGS. 1, 10 and 16 and is formed of similar paper board. This blank has a score line 144, with or without interrupted cuts, and a discontinuous 0r sectional score line 145, and also score lines 146, 147, 148, 149, and 151. Panel 152 forms the front of the carton. Projecting from the edge of this panel are two spaced locking flaps 153, each having an abutment edge 154. These flaps can be used in the same manner as the single locking fiap 17 of FIG. 8 and flap 113 of FIG. 17. Also the single locking flap may be used on the blank of FIG. 23, if desired. Locking flaps 153 are spaced apart leaving a central space between them the material of which is added at the opposite end of the blank, as will be presently described.
The panels 155 and 156 are integral with front panel 152. Panel 157 forms the bottom of the carton and sealing flaps 158 and 159 are integral with the bottom 157 and serve to make a tight seal for the bottom edges, as shown in FIG. 29 and as will be apparent later on.
Panel 160 forms the back of the carton and has integral panels 161 and 162 which are to be bonded to panels 155 and 156 respectively to form the ends of the carton, the sealing flaps 158 and 159 being folded between them in the completed carton, as will be described.
The cover of the carton is formed by the top panel 163, the front depending panel or extension 164 and end flanges which are formed by curved sealing flap 165 and rectangular flap 166 at one end and by curved sealing flap 167 and rectangular fiap 168 at the opposite end (see FIGS. 23 and 30). A flap 169 projects from front cover panel 164, but because of the provision of the two spaced 9 locking flaps 153 it has two abutment edges 176' which are properly located to be engaged by the latching flaps 153 in the latching of the cover when the filled carton is opened and reclcsed by the user.
The central portion of flapv 169 between the abutment edges 170 is widened by the addition to the blank of the material on the next blank corresponding to the central space previously referred to between the two latching flaps 153. This is advantageous as it renders fiap 169 easier to fold along the score line 144. Should single locking flaps be used, such for example as flap 118 in FIG. 16, flap 169 will not be widened at its central portion and a single abutment edge in line with edges 170 will be used.
The segment areas are cut-scored circles 171, 172 and 173 and function in relation to the flap 169 and abutment edge 170 in the same manner as the corresponding parts of FIGS. 1 and 17. It will be understood that any suitable number of these segment areas may be used, and
also that the single segment area or strip, as shown at 96 in FIG. 11, or the triangular segment areas, shown in any of the previous figures may be used, if desired.
Although for the blank shown in FIG. 23 no illustra tion corresponding to FIGS. 2, 11 and 17 has been included, it will be understood that in its semi-erected and fiat condition the blank of FIG. 23 is folded in a manner similar to that shown in those figures and particularly FIG. 17. That is to say, glue is applied to the fiat blank of FIG. 23 in the. same way as it is to the blanks shown in FIGS. 1, l and 16, that is, by an applicator which applies a strip or glue transversely over the segment areas.
At the same time that glue is applied over the segment areas 171-173 it may also be applied on the inner or top face of flap 169. The surfaces of panels, 152, 155 and 156 are printed with the exception of the circular areas 171173, and it is the glue on these areas only that is effective as an adhesive. If desired a suitably constructed glue wheel may be used for the purpose of applying spots of glue at the locations of the circular areas 171-173, and in that case prior printing of the blank is unnecessary.
The folding of the blank of FIG. 23 to form a semierected carton in flat condition, as shown in FIG. 17, for example, is carried out by folding the. flat sheet comprising panels 152, 153, 155 and 156 along score line 149 through about 180 to overlie panel 157 and extended flaps 158 and 159', and to partially overlie panels 160, 161 and 162. The panels 163- and 164V and extended flaps 165, 166, 167 and 168 are folded about score line 147 to overlie the end portion of front panel 152 in a manner similar toy that shown in FIG. 17, panel 169 having been previously folded about fold line 144 and glued to the inner surface of panel 164. The outer surface of flap 169 is glued to the front panel 152 at the three circular segment areas 171-173, the glue having been applied to these areas, as described in the preceding paragraph.
The cartons are shipped to the user in the flat and partly pre-sealed condition just described, the same as in the case of the forms of the invention shown in FIGS. 2 and 3, 11, l2, l7 and 18, and the user completes the erection of the cartons, as illustrated in FIGS. 24 to 28. During this operation he fills the carton With his product. Both the erection and closing of the carton and the loading of the product can be carried out on suitably modified conventional machines.
After squaring up a carton in the same manner as indicated in FIG. 18 and as described previously in connection with the other forms of the invention, the panels and flaps at the opposite ends of the carton are manipulated to close and. seal it in substantially the following sequence:
Panel 161 at the left (FIG. 24) is folded upwardly to closed. position, and the load is insertedbetween panels 156and 162 at the opposite end and against the 16 folded panel 161. After this the folding of the remain ing. panels and flaps at both ends of the carton and the application of glue take place simultaneously at both ends of the carton, and a description thereof more particularly for the right-hand. end, will be given.
Panel 162 is first folded upwardly to vertical position against the load. Inasmuch as the flap 159 and curved flap 167 project in the planes of their respective panels 157 and 163 difiiculty has been experienced through the engagement of the end portions of panel 162 with the edges of these two flaps. This difiiculty has now been avoided by concavingthe end edges of flap 162 (and also flap 161) at the opposite end as indicated at 178. Flaps 159 and 167 are. next folded inwardly. The presence of the square edges 159a on flaps 158 and 159 (FIG. 23) is advantageous in providing stability and in maintaining the box in square condition. Glue is applied to the inner surface of panel. 156 and to a portion of the inner surface of flap 168 while both of these members remain in extended position. This may be done by passing this flap and panel over a glue roll 174 (FIG. 26).
The top corner portions of panels 155 and 156 have been cut away, as were the corners of the corresponding panels 20 and. 21 of FIG. 1, 73'and 74 of FIG. 10, and and 121 of FIG. 16, and for a similar purpose. When the glue is applied to the segment areas 171-173 (blank upfolded as in FIG. 23), as previously described, any glue received on the edges of the blank by touching the glue wheel is masked when cover end flaps 166 and 168 are folded thereover to the semi-erected positions of FIG. 2, 11 or 17, and this prevents such glue from contacting similar blanks in stacked relation.
However, the corners of panels and 156 are cut away in a special manner having additional advantages. These corners have a somewhat different configuration. As shown in FIG. 23 the corners of these two flaps are cut away on a 45 line 176 for about one third of the. panel width, thence along a steeper, or curved, line to a small notch or shoulder 176a, and then continuing to the panel edge in a straight edge 175 at right angles to the outside edge of the panel.
Each of the rectangular cover end flaps 166 and 168 which, with sealing flaps and 167 form the end flanges of the cover, may be provided with a small projection in the form of a lobe or ear a (FIG. 23). These lobes serve the important purpose of controlling and maintaining correct position and alignment of flaps 1 66, 168 with respect to the panels 155, 156 and with the top panel 163 of the cover in the final sealing of the carton as now will be described.
With the carton traveling on the machine in the di rection of the arrow (FIG. 24) the lobes 175a support the fiaps 166 and 168 in the horizontal plane of the extending panels 155 and 156.. As the cartons travel continues the panel 155 and flap 166 at one end, and panel 156 and flap 168 at the other end, pass over sup porting rails (not' shown). Just after the flaps 166, 168 pass beyond the ends of such rails suitably designed plows (or other mechanisms) sharply depress the flaps 166 and' 168 so that they snap past their respective points of lobe support. The edges of the lobes, particularly their outer edges, are shaped as cams to facili+ tate this action.
Having left the plow-s or other flap depressing mechanism in this condition, the carton next passes between glue rolls, one of which is shown at 174 (FIG. 26), which apply adhesive, as previously mentioned, to the exposed underside areas of the flaps 166 and 168 not maskedby the uncut-away areas of the panels 155 and .156, and to the entire remaining underside area-s of these panels With adhesive thus applied, the flaps 166 and 168 and the panels 155 and 156 are plowed downwardly in unison against the previously up-folded. panels 161 and 162 11 and the thereover in-folded sealing flaps 165, 167 and 158, 159 respectively. The flaps 166, 168 are thus bonded to the sealing flaps 165, 167 respectively, but are not bonded to the surrounding exposed areas of the underlying panels 161, 162 which areas have been printed to prevent such bonding.
It is in the course of this downward plowing (FIG. 27) and bonding of the flaps 166, 168 and panels 155, 156 that the lobes 175a perform their important function of controlling and maintaining correct position and true alignment of the lower edges of these flaps by abutment with the upper straight edge portions 175 of these panels. Were it not for the edge-to-edge abutment maintained by these lobes, the drag of the folding plows and of the pressure section of the machine would cause varying unsightly and inoperative mis-alignment of the flaps 166, 168 with the edges 175 of the respective panels 155, 156 and with the top panel 163 of the cover of the finished carton.
Also, since the cover end fiaps 166, 168 are not bonded at any point to the panels 161, 162, their lower edges would be free to flare outwardly were it not for the lobes 175a which, despite no adhesive, hold the lower edges of these flaps neatly, firmly and close to the rear corners of the carton, yet leaving the sides of the assembled cover otherwise un-secured and free to open when the front seal (spots 171-173) of the cover is broken. The cover can be tilted upwardly as shown in FIG. 30 without hindrance from the lobes 175a. Upon reclosure of the: cover these lobes will remain on the exterior surfaces of the respective ends of the carton.
Since the cover end flaps 166, 168 are engaged by the plows in advance of the panels 155-156 it is desirable to transmit the folding motion of the flaps to the panels. This is done, for example, by the pressure of flap 168 against the shoulder 176a and the triangular area of panel 156 beneath this flap (FIG. 25), by which a positive downward motion to the panel 156 is effected. FIG. 25 shows flap 168 raised to expose the triangular area mentioned. If desired, however, this notch 176a may be omitted and the outline of the cut-away portion of the panel made as shown in the modified form of FIG. 32. In this form the 45 line 176 joins a steeper line 177 the outer end of which connects with the straight right-angled edge 175.
Another feature of the present construction is the cutting of short angular slits 180, 181, 182 and 183 in panels 161 and 162. These slits extend inwardly from the bases of panels 161 and 162 (FIG. 23), that is, from the respective fold lines 150 and 151. This places one of the slits near each corner of rear panel 160. The purpose of these slits is to obtain tight joints at both the bottom and top of the box, and they function as follows:
Slit 181 is at the top of the box (FIGS. 26 and 30) and slit 183 at the bottom (FIG. 26). When flap 168 and panel 156 are folded downwardly after having received the glue on their undersurfaces, they are pressed against the surfaces of the respective curved flaps 167 and 159 which have previously been folded inwardly against panel 1152. The presence of the slits permits the lower ends of flaps 167 and 159 to be pressed inwardly to a slight extent flexing the material of panel 162 in contact with these flaps and thereby bringing the outer surfaces of the lower ends of these flaps into the same plane as the outer surface of panel 162 on the opposite sides of and adjacent the respective slits 181 and 183.
This is best shown in FIG. 29 where flap 159 has been folded upwardly against the outer surface of the end portion of panel 162. Flap 159 is shown in the position it will occupy after panel 156 has been folded to closed position. That is to say, the outer surface of the right end portion 184 of this flap is shown in the sarne plane as the narrow portion 185 of panel 162 between slit 183 and the corner of the box.
In order to facilitate cooperation of the flaps with the slits, each of these four flaps 158, 159, 165 and 167 advantageously is formed with a straight edge 186 at least as long as the length of the adjacent slit. This prevents the possibility of the edge of the flap depressing the area of the panel on the opposite side of the slit such, for example, as area 185 in FIG. 29. The angle of the edges 186 of flaps 158, 159, 165 and 167 with respect to fold lines and 151 (FIGS. 23 and 29) may be varied as desired, but advantageously these edges are placed at about 45 to the fold lines. The angle of the slits 180-183 with respect to fold lines 150 and 151 is made slightly less than the angle of the edges 186 in order to reduce or eliminate the possibility of edges 186 overlapping their adjacent slits and overlapping onto areas 185.
The two short latching flaps 153 (FIG. 30) are shown bent outwardly so that when the cover is reclosed by the user they will be folded downwardly to provide the latching engagement between these abutment edges 154 and the abutment edges 170 of folded flap 169 which extends along the front panel of the cover. It will be understood that latching flaps 153 may, when the carton is in its semi-erected state, extend upwardly in a position corresponding to flap 17 of FIG. 2 or to flap 71 of FIG. 12.
An important feature of the present invention which is common to all of the embodiments described above is that of the cut-away corners of the end-sealing panels (see panels 20 and 21 of FIG. 1, 73 and 74 of FIG. 11, 120 and 121 of FIG. 16 and 155 and 156 of FIG. 23). This feature has important advantages both in the manufacture of the semi-erected carton and in the subsequent formation or erection of the box and the sealing thereof.
In the manufacture of the carton it enables the use of high speed straight line gluing of the glue seam, that is, the attachment between the folded portions of the semi-erected carton, so that this operation can be performed on standard equipment. Without these cut-away areas at the corners the blanks would have to be timeglued, which would reduce the speed of gluing by about one-half, in order to avoid the application of glue to exposed areas that would cause the blanks to stick together under pressure, as when stacked.
Furthermore, in most cases the cut-away corners enable the glue to be applied, in the sealing of the filled box, in one pass over a single glue wheel at each side of the carton, so as to bond not only the box end sealing flags, but also just the desired limited areas of the cover end flaps where this is intended.
Heretofore, in the manufacture of KLIKTOP boxes special equipment has been required in the formation of the cover portions, and even then these cover portions were incapable of being sealed. However, by the present invention both the formation and the sealing of such cartons is accomplished by the use of standard and existing manufacturing and sealing equipment, thus simplifying and reducing the cost of cartons of this type.
I claim:
1. A carton formed of a single blank having rectangular panels for forming the front, back, end and bottom walls, and a cover panel hinged to the back panel, sealing flap extensions on at least one of said bottom and cover panels, the end panels projecting from the front and back walls and being foldable to form the ends of the carton, the panels projecting from the back wall being folded to form the inner layers of the end walls, the bottom sealing flaps being folded thereover and the panels projecting from the front carton wall being folded over both the bottom sealing flaps and the inner layer and being glued thereto, the panels forming said respective inner layers each having an angularly disposed slit therein extending respectively from at least two of the rear corners of the carton, and the sealing flaps at said corners each having an edge portion positioned adjacent one side of 13 each of said slits, the glued surface of the outer end wall panel contacting the surface of one of said sealing flaps and the surface of said inner panel in the same plane thereby forming a tight corner joint.
2. A carton acording to claim 1 wherein the slits are of the order of one-half inch in length and disposed at an angle of about 45 with the rear wall of the carton.
3. A carton blank according to claim 1 wherein the sealing flaps at the rear corners of the carton each have a straight edge portion disposed adjacent the slit in the inner layer.
4. A carton formed of a single blank rectangular panels for forming the front, back, end and bottom walls, and a cover panel hinged to the back panel and having a cover front-forming extension and cover end-forming members extending therefrom which telescope over the front and end panels of the carton When the carton is erected, sealing flap extensions on said cover and bottom panels, the end panels projecting from the front and back Walls being foldable to form the ends of the carton, the panels projecting from the back wall being folded to form the inner layers of the end walls, the bottom sealing flaps being folded thereover and the panels projecting from the front carton Wall being folded over both the bottom sealing flaps and the respective inner layers and being glued thereto, characterized by the fact that the opposite edges of the panels projecting from the back wall are made in concave shape so that in folding these panels they will not engage the edges of the unfolded sealing flaps.
5. A carton formed from a blank having ractanglar panel member for forming the front, back, end and bottom walls, and a cover panel hinged to the back panel, the end panel members projecting from the front and back walls and being foldable to form the ends of the carton with the panel members projecting from the back wall forming the inner layer of the end walls, the cover panel having a front-forming extension and cover endforming members extending therefrom arranged to telescope the front and ends of the carton when the cover is in closed position, the cover end-forming members and the panel members projecting from the front wall being foldable to form respectively the outer layer of the end walls and the cover ends, sections of the adjacent edges of these two members at each end of the carton being positioned in abutting relationship, and projecting means on one of said abutting members engaging the opposite member so as to prevent misalignment of said abutting members during folding to form the completely erected carton.
6. A carton blank according to claim 5 wherein the projecting means is in the form of an ear and projects from the lower outer corner of each of the cover end members, said ears, in the filled and closed carton, underlying the adjacent marginal edge portion of each of the outer end wall members.
7. A carton blank according to claim 6 wherein the projecting means is in the form of an ear having a sloping cam edge to facilitate the shifting of the ear to the inner surface of the panel member projecting from the front wall.
8. A carton blank according to claim 5 wherein the projecting means is in the form of an ear projecting from one of the abutting members.
9. A carton blank according to claim 8 wherein the ear is provided with a sloping cam edge to facilitate the shifting of the ear to the opposite surface of the cooperating abutting member.
10. A carton formed from a blank'having rectangular panel members for forming the front, back, end and bottom walls, and a cover panel hinged to the back panel,
the end panel members projecting from the front and back walls and being foldable to form the ends of the carton with the panel members projecting from the back wall forming the inner layer of the end walls, the cover panel having a front portion and end members arranged to telescope the front and ends of the carton when the cover is in closed position, the cover end members and the panel members projecting from the front wall being foldable to form respectively the outer layer of the end walls and the cover ends, sections of the adjacent edges ofthese two members at each end of the carton being positioned in abutting relationship, projecting means adjacent the lower corner of one of said abutting members to prevent misalignment of the abutting members during folding to form the completely erected carton, and projecting means disposed on the panel member which forms the outer layer of the end wall, such projecting means being engaged with the inner surface of the 'cover and flap so that folding pressure applied to such flap will also serve to fold the panel member forming the outer layer.
11. A carton formed of a single blank having rectangular panels for forming the front, back, end and bottom walls, and a cover panel hinged to the back panel and having a cover front-forming extension and cover endforming members extending therefrom which telescope over the front and end panels of the carton when the carton is erected, sealing flap extensions on said cover and bottom panels, the end panels projecting from the front and back walls being foldable to form the ends of the carton, the panels projecting from the back wall being folded to form the inner layers of the end walls, the bottom sealing flaps being folded thereover and the end panels projecting from the front carton wall forming the outer layers of the end walls and being folded over both the bottom sealing flaps and the respective inner layers and being glued thereto, characterized by the fact that the top outer corners of the end panels projecting from the front wall of the carton are cut away so that portions thereof will lie in edge-abutting relationship with portions of the cover end-forming members.
12. A carton formed of a single blank having rectangular panels for forming the front, back, end and bottom walls, and a cover panel hinged to the back panel and having a cover front-forming extension and cover endforming members extending therefrom which telescope over the front and end panels of the carton when the carton is erected, sealing flap extensions on said cover and bottom panels, the end panels projecting from the front and back walls being foldable to form the ends of the carton, the panels projecting from the back wall being folded to form the inner layers of the end walls, the bottom sealing flaps being folded thereover and the end panels projecting from the front carton wall forming the outer layers of the end walls and being folded over both the bottom sealing flaps and the respective inner layers and being glued thereto, characterized by the fact that each end wall outer layer is cut away to form an upper edge appreciably below the top of the carton, and that such exterior cover end-forming member has a Width as measured from the top in the direction of the bottom whereby the edge thereof makes edge-abutting engagement with the upper edge of the outer end wall.
13. A carton formed of a single blank having rectangular panelsfor forming the front, back, end and bottom walls, and a cover panel hinged to the back panel and having a cover front-forming extension and cover endfor-ming members extending therefrom which telescope over the front and end panels of the carton when the carton is erected, sealing flap extensions on said cover and bottom panels, the end panels projecting from the front and back walls being foldable to form the ends of the carton, the panels projecting from the back wall being folded to form the inner layers of the end walls, the bottom sealing flaps being folded thereover and the end panels projecting from the front carton wall forming the outer layers of the end Walls and being folded over both the bottom sealing flaps and the respective inner layers and being glued thereto, characterized by the fact that the 15 contour of the cut-away portions of the end panels projecting from the front wall of the carton is such that the forward edges thereof coincide substantially with the forward edges of the cover end sealing flaps so that the edges of these members do not overlap when the carton is fully erected.
14. A carton formed of a single blank having rectangular panels for forming the front, back, end and bottom walls, and a cover panel hinged to the back panel and having a cover front-forming extension and cover endforming members extending therefrom which telescope over the front and end panels of the carton when the carton is erected, sealing flap extensions on said cover and bottom panels, the end panels projecting from the front and back walls being foldable to form the ends of the carton, the panels projecting from the back wall being folded to form the inner layers of the end walls, the bottom sealing flaps being folded thereover and the end panels projecting from the front carton wall forming the outer layers of the end walls and being folded over both the bottom sealing flaps and the respective inner layers and being glued thereto, characterized by the fact that the top outer corners of the panels projecting from the front wall of the carton are cut away so that portions of the under surface of the cover end-forming members which correspond approximately in area with that of the cover end sealing flaps will be exposed for the application of glue simultaneously with the under surface of the uncutaway portions of said panels whereby the cover endforming members may be brought into adhesive bond with the cover end sealing flaps in closing and sealing the ends of the fully erected carton.
References Cited in the file of this patent UNITED STATES PATENTS 2,015,413 Snyder Sept. 24, 1935 2,280,904 Erekson Apr. 28, 1942 2,403,698 Williamson July 9, 1946 2,441,445 Ringler May 11, 1948 2,649,239 Ellsworth Aug. 18, 1953 2,651,450 Ellsworth Sept. 8, 1953 2,701,091 Sullivan Feb. 1, 1955 2,828,060 Brown Mar. 25, 1958 2,963,214 Leone Dec. 6, 1960 FOREIGN PATENTS 585,606 Great Britain Feb. 13, 1947 I UNITED STATESIPATENTI OFFICE I CERTIFICATE OF CORRECTION Patent No; 3 073,5Ol
January 15, 1963 i I Marshall I. Williamson I It is hereby certified that error appears in the above numbered patent requiring correction and that thesaid Letters Patent shouldread as corrected below. I
column 12, flaps for "upfolded" line 48, for "flags" read column 13, line l2 after "blank" line 32, for "mem insert having her" read members column 14 line 15., for "and" read end Column 1, line 25, for "elevation" read invention column 5, line 7 for "limited" read lifted column 8, line l3 for "compltion" read completion column 9, line 81, for "or read of column 10, line 27 read unfolded 1 Signed and sealed this 27th day of August 1963.
(SEAL) Attest:
ERNEST w. SWIDER DAVID LADD Attesting ()fficer Commissioner of Patents

Claims (1)

1. A CARTON FORMED OF A SINGLE BLANK HAVING RECTANGULAR PANELS FOR FORMING THE FRONT, BACK, END AND BOTTOM WALLS, AND A COVER PANEL HINGED TO THE BACK PANEL, SEALING FLAP EXTENSIONS ON AT LEAST ONE OF SAID BOTTOM AND COVER PANELS, THE END PANELS PROJECTING FROM THE FRONT AND BACK WALLS AND BEING FOLDABLE TO FORM THE ENDS OF THE CARTON, THE PANELS PROJECTING FROM THE BACK WALL BEING FOLDED TO FORM THE INNER LAYERS OF THE END WALLS, THE BOTTOM SEALING FLAPS BEING FOLDED THEREOVER AND THE PANELS PROJECTING FROM THE FRONT CARTON WALL BEING FOLDED OVER BOTH THE BOTTOM SEALING FLAPS AND THE INNER LAYER AND BEING GLUED THERETO, THE PANELS FORMING SAID RESPECTIVE INNER LAYERS EACH HAVING AN ANGULARLY DISPOSED SLIT THEREIN EXTENDING RESPECTIVELY FROM AT LEAST TWO OF THE REAR CORNERS OF THE CARTON, AND THE SEALING FLAPS AT SAID CORNERS EACH HAVING AN EDGE PORTION POSITIONED ADJACENT ONE SIDE OF EACH OF SAID SLITS, THE GLUED SURFACE OF THE OUTER END WALL PANEL CONTACTING THE SURFACE OF ONE OF SAID SEALING FLAPS AND THE SURFACE OF SAID INNER PANEL IN THE SAME PLANE THEREBY FORMING A TIGHT CORNER JOINT.
US796813A 1959-03-03 1959-03-03 Semi-erected carton Expired - Lifetime US3073501A (en)

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185046A (en) * 1962-12-17 1965-05-25 Frank C Gross Apparatus for and method of carton erection
US3484036A (en) * 1968-01-10 1969-12-16 American Can Co Tamperproof reclosable carton with interleaving flaps
US4583679A (en) * 1984-01-17 1986-04-22 Manville Service Corporation Resealable paperboard package
US5090616A (en) * 1990-11-14 1992-02-25 Riverwood Natural Resources Corporation Folding carton blank and method of forming same
US5205478A (en) * 1991-05-31 1993-04-27 Rock-Tenn Company End-loading, hooded container
US5947368A (en) * 1997-05-02 1999-09-07 Fold-Pak Corporation Folding carton and blank with reclosure means
US6206280B1 (en) 1997-05-02 2001-03-27 Fold-Pak Corporation Folding carton and blank with reclosure means
US20020011515A1 (en) * 2000-06-28 2002-01-31 Walsh Joseph C. Carton blank, carton and method of forming the carton
US20030141357A1 (en) * 2002-01-28 2003-07-31 Ronan Michael P. Easy-open folding carton and method for manufacturing same
US20040178254A1 (en) * 2003-03-14 2004-09-16 Ronan Michael P. Easy open folding carton and method for manufacturing same
US6892513B1 (en) 1999-10-19 2005-05-17 Kraft Foods Holdings, Inc. Method of forming and filling an end load carton with a food delivery system
JP2009083931A (en) * 2007-09-10 2009-04-23 Nippon Paper Industries Co Ltd Packaging case
USD747191S1 (en) 2013-03-14 2016-01-12 Kraft Foods Group Brands Llc Folded container
US9481486B2 (en) 2013-03-14 2016-11-01 Kraft Foods Group Brands Llc Container with secure audible closure
US11472593B1 (en) 2019-08-29 2022-10-18 Packaging Corporation Of America Auto-locking and tamper evident container

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US2015413A (en) * 1934-10-12 1935-09-24 Marathon Paper Mills Co Quick opening carton
US2280904A (en) * 1940-11-19 1942-04-28 Borden Co Packaging
US2403698A (en) * 1944-06-13 1946-07-09 Nat Folding Box Co Hinged cover container
GB585606A (en) * 1944-07-03 1947-02-13 Frank Manning Arkle Improvements in or relating to cartons or boxes made from cardboard or the like
US2441445A (en) * 1943-04-12 1948-05-11 Gardner Richardson Co Method and machine for forming and filling reclosable cartons
US2649239A (en) * 1950-05-08 1953-08-18 Ohio Boxboard Co Sealed container
US2651450A (en) * 1950-05-08 1953-09-08 Ohio Boxboard Co Sealed container
US2701091A (en) * 1949-10-01 1955-02-01 Kraft Foods Co Container
US2828060A (en) * 1955-06-14 1958-03-25 Nat Paper Box Ltd Reclosable carton
US2963214A (en) * 1958-05-26 1960-12-06 New Haven Board & Carton Compa Cartons with replaceable end closures

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Publication number Priority date Publication date Assignee Title
US2015413A (en) * 1934-10-12 1935-09-24 Marathon Paper Mills Co Quick opening carton
US2280904A (en) * 1940-11-19 1942-04-28 Borden Co Packaging
US2441445A (en) * 1943-04-12 1948-05-11 Gardner Richardson Co Method and machine for forming and filling reclosable cartons
US2403698A (en) * 1944-06-13 1946-07-09 Nat Folding Box Co Hinged cover container
GB585606A (en) * 1944-07-03 1947-02-13 Frank Manning Arkle Improvements in or relating to cartons or boxes made from cardboard or the like
US2701091A (en) * 1949-10-01 1955-02-01 Kraft Foods Co Container
US2649239A (en) * 1950-05-08 1953-08-18 Ohio Boxboard Co Sealed container
US2651450A (en) * 1950-05-08 1953-09-08 Ohio Boxboard Co Sealed container
US2828060A (en) * 1955-06-14 1958-03-25 Nat Paper Box Ltd Reclosable carton
US2963214A (en) * 1958-05-26 1960-12-06 New Haven Board & Carton Compa Cartons with replaceable end closures

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185046A (en) * 1962-12-17 1965-05-25 Frank C Gross Apparatus for and method of carton erection
US3484036A (en) * 1968-01-10 1969-12-16 American Can Co Tamperproof reclosable carton with interleaving flaps
US4583679A (en) * 1984-01-17 1986-04-22 Manville Service Corporation Resealable paperboard package
US5090616A (en) * 1990-11-14 1992-02-25 Riverwood Natural Resources Corporation Folding carton blank and method of forming same
US5205478A (en) * 1991-05-31 1993-04-27 Rock-Tenn Company End-loading, hooded container
US5947368A (en) * 1997-05-02 1999-09-07 Fold-Pak Corporation Folding carton and blank with reclosure means
US6206280B1 (en) 1997-05-02 2001-03-27 Fold-Pak Corporation Folding carton and blank with reclosure means
US6892513B1 (en) 1999-10-19 2005-05-17 Kraft Foods Holdings, Inc. Method of forming and filling an end load carton with a food delivery system
US7036714B2 (en) * 2000-06-28 2006-05-02 Graphic Packaging International, Inc. Carton blank, carton and method of forming the carton
US20050127150A1 (en) * 2000-06-28 2005-06-16 Walsh Joseph C. Carton blank, carton and method of forming the carton
US20020011515A1 (en) * 2000-06-28 2002-01-31 Walsh Joseph C. Carton blank, carton and method of forming the carton
US20060202003A9 (en) * 2000-06-28 2006-09-14 Walsh Joseph C Carton blank, carton and method of forming the carton
US7210612B2 (en) 2000-06-28 2007-05-01 Graphic Packaging International, Inc. Carton blank, carton and method of forming the carton
US20030141357A1 (en) * 2002-01-28 2003-07-31 Ronan Michael P. Easy-open folding carton and method for manufacturing same
US20040178254A1 (en) * 2003-03-14 2004-09-16 Ronan Michael P. Easy open folding carton and method for manufacturing same
JP2009083931A (en) * 2007-09-10 2009-04-23 Nippon Paper Industries Co Ltd Packaging case
USD747191S1 (en) 2013-03-14 2016-01-12 Kraft Foods Group Brands Llc Folded container
US9481486B2 (en) 2013-03-14 2016-11-01 Kraft Foods Group Brands Llc Container with secure audible closure
US11472593B1 (en) 2019-08-29 2022-10-18 Packaging Corporation Of America Auto-locking and tamper evident container

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