US3683822A

US3683822A - Disposable pallet

Info

Publication number: US3683822A
Application number: US26670A
Authority: US
Inventors: Joe R Roberts; James L Torrence
Original assignee: Individual
Current assignee: Individual
Priority date: 1970-04-08
Filing date: 1970-04-08
Publication date: 1972-08-15
Anticipated expiration: 1989-08-15

Abstract

The pallet includes a plurality e.g., 2 or more, commonly 3) of parallel spaced, elongated base members interconnected by a plurality e.g., 2 or more, commonly 6) of parallel spaced, elongated tie members. The base members and the tie members are preferably formed from blanks of double faced corrugated paperboard material which are scored and folded to form each member with a triangular cross section and a hollow interior. Each one of the base members has triangular notches or openings formed therein which are equal in number to the tie members and which extend transversely through the base member at predetermined locations along the base member; and a portion of each one of the tie members is removably and frictionally received in one of the triangular notches in each one of the base members.

Description

United States Patent Roberts et al.

[54] DISPOSABLE PALLET [72] Inventors: Joe R. Roberts, 32 West Ogden, Hinsdale, Ill. 6052l; James L. Torrence, 806 Forest Rd., La Grange Park, Ill. 60525 221 Filed: April 8,1970

21 Appl. No.: 26,670

1511 3,683,822 51 Aug. 15, 1972 England 108/51 England 108/56 ABSTRACT The pallet includes a plurality e.g., 2 or more, commonly 3) of parallel spaced, elongated base members [5 2] US. Cl ..l08/56 interconnected by a plurality ag" 2 or more com [51] Int. Cl. ..B65d 19/12 moldy 6) of parallel Spaced elongated i members Fleld 0 Search The base members and the tie members are preferably 16 139 formed from blanks of double faced corrugated paperboard material which are scored and folded to form [56] References Cited each member with a triangular cross section and a hollow interior. Each one of the base members has trian- UNITED STATES PATENTS gular notches or openings formed therein which are 2,576,715 11/1951 Farrell .1 108/56 equal in number to the lie members and which extend 2 716 532 8/1955 wysong et aL 108/55 X transversely through the base member at predeter- 3199765 8/1965 Locke 229/22 x mined locations along the base member; and a portion 3256839 6,1966 g 08/56 of each one of the tie members is removably and frictionally received in one of the triangular notches in FOREIGN PATENTS OR APPLICATIONS each one of the base members- 519,055 6/ 1921 France 108/51 3 Claims, 12 Drawing Figures 2| l All in m I 1 12 Mvw Pmmmws 1 I912 3.683; 822

SHEET 1 OF 2 N VE N TORS JOE R. ROBETS j JAMES L. TO/RRENCE ATT YSL/ DISPOSABLE PALLET The present invention relates to a pallet which is lightweight and disposable. More specifically, the present invention relates to a corrugated paperboard pallet having at least two triangularly shaped base members which are adapted torest on a floor surface, and a plurality of triangularly shaped cross or tie members which extend between and interconnect the base members.

Pallets are widely used in transportation and storage or goods (typically packaged in boxes or bags) which are stacked on a pallet for shipment therewith as an integral unit. Heretofore such pallets have been made primarily of wood and have in general not been inexpensive and disposable.

It is desireable, in many instances, that the pallets be inexpensive so that after the goods have been removed from the pallets they can be discarded to avoid the cost of returning the empty pallets to their point of origin.

In other instances, where it is desirable to reuse the pallets, it is desirable that the pallets be of a simple construction so that they can be easily disassembled by unskilled labor and packed in a small space for return shipment. Additionally, it is desirable that the pallet be constructed of easily assembled, inexpensive members which can be assembled by unskilled labor at the point of use without the use of tools or fasteners.

Another object of the present invention is the provision of a pallet defined by a lattice of elongated supporting members each of which has a triangular cross section.

Another object of the present invention is the provision of a pallet in which supporting members of the pallet are formed from blanks of sheet material which are scored and folded to form each member with a generally triangular cross section and a hollow interior.

Still another object of the present invention is the provision of a kit for constructing a pallet, the kit including a plurality of first and second elongated blanks formed from a sheet material and each of the blanks having at least two score lines dividing the blank into at least three panels so that each blank can be folded to form a supporting member with a triangular cross section and a hollow interior. Each of the second blanks has at least two pairs of holes with each pair including a first hole in one panel and and a second hole in another panel, the first and second hole being laterally aligned so that when the second blank is folded to form a supporting base member the laterally aligned holes will form a triangular opening extending transversely through the base member for receiving a portion of a tie member formed from one of the first blanks.

These and other objects and advantages of the present invention, and the manner of their attainment, will become more apparent from the following detailed description of a preferred embodiment of the present invention taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a top plan view of the pallet of the present invention;

FIG. 2 is an end elevational view of the along line 2-2 of FIG. 1;

FIG. 3 is a fragmentary side elevational view of the pallet lattice along line 3-3 of FIG. 1;

FIG. 4 is an enlarged end view of a tie member of the pallet shown in FIG. 1;

pallet taken FIG. 5 is a plan view of a blank of sheet material from which the tie member shownin FIG. 4 is formed;

FIG. 6 is an enlarged end view of a base member of the pallet shown in FIG. 1;

FIG. 7 is a plan view with portions broken away of a blank of sheet material from which the base member shown in FIG. 6 is formed.

FIG. 8 is an enlarged end view of a modified form of base member similar to the base member shown in FIG.

FIG. 9 is a plan view with portions broken away of a blank of sheet material from which the base member shown in FIG. 8 is formed;

FIG. 10 is an enlarged end view of a modified form of tie member similar to the tie member shown in FIG. 4;

FIG. 11 is a plan view of a blank of sheet material from which the tie member shown in FIG. 10 is formed; and,

FIG. 12 is an elevational plan view of a lattice structure formed with members similar to the tie members and base members shown in the previous figures and which is adapted for use in building construction.

Referring now the drawings in greater detail, one embodiment of the pallet of the present invention is generally indicated at 10 in FIG. 1. As shown, the pallet 10 includes three parallel spaced

base members

11, 12, and 13 and six parallel spaced tie members 21-26 which interconnect the base member 11-13 to form a supporting lattice structure which defines the pallet 10.

As shown in FIG. 2, each of the base members 11-13 is generally triangular in shape. Likewise, as shown in FIG. 3, each of the tie members 21-26 is generally triangular in shape. In the illustrated embodiment, each one of the base members 11-13 has six transverse notches or openings 28, each of which receives and frictionally holds a portion of one of the tie members 21-26, as shown in FIGS. 1-3. Preferably, the openings 28 are triangularly shaped to provide a close fit between the sides of the opening 28 and the portion of a triangularly shaped tie member received in the opening 28. However, a trapezoidally shaped opening 28 will also provide a close fit.

The size of the triangular openings 28 and'the triangularly shaped tie members 21-26 is less than the size of the triangularly shaped base members 11-13. In this way, and as best shown in FIG. 2, a space is provided below the bases of the interconnecting tie members 21-26 between the base members 11 and 12 and between the base members 11 and 13. These spaces permit the insertion of forks of a fork lift mechanism underneath the pallet 10 for raising, lowering and carrying the pallet 10 with or without a load thereon.

In the pallet construction shown in FIGS. 2 and 3, the apex of each of the triangular openings 28 intersects the apex of the triangularly

shaped base member

11, 12 or 13. However, it is preferred that the openings 28 do not intersect the apex of the base members 11-13 to keep the base members 1 1-13 as strong as possible.

Since all of the tie members 21-26 are formed in the same manner, only the tie member 21 will be described in detail with reference to FIGS. 4 and 5. As best shown in FIG. 4, the tie member 21 is preferably formed from a double faced corrugated paperboard material, and initially, the tie member 21 is in the form of an elongated paperboard blank 30 as shown in FIG. 5. The blank 30 is divided by four score lines 31-34 into five panels 41-45. The center panel 43 forms the base of the tie member 21 after the

side portions

46 and 47 on either side thereof are folded over to form the tie member with the cross section shown in FIG. 4. This is accomplished by first folding the side portion 46 twice along the

score lines

32 and 31 so that the

panels

42 and 41 are formed in an inverted V over the center panel 43. Then the other side portion 47 is folded twice along the

score lines

33 and 34 to super-impose the

panels

44 and 45 over the

panels

41 and 42, with the

panels

44 and 45 also forming an inverted V over the base 43. In this way, the tie member 21 is formed with two double strength

side wall portions

48 and 49 defined by the overlapping

panels

44, 45 and 41, 42, and with a base portion formed by the center panel 43. Preferably, the

panels

42 and 45 are secured together by a suitable fastening means, such as by an adhesive or by several staples (not shown).

Since each of the base members 1 1-13 are formed in a similar manner, only the base member 11 will be described in detail with reference to FIGS. 6 and 7. As shown in FIG. 6, the base member 11 is also preferably formed from a double faced corrugated paperboard material and, initially, is in the form of an elongated paperboard blank 50. The blank 50 has six score lines 51-56 for dividing the blank 50 into seven panels 61-67. The

side portions

68 and 69 of the blank 50 on either side of the center panel 64 are mirror images of each other and are folded in a similar manner to form the base member 11 with the cross section shown in FIG. 6. To accomplish this, the side portion 68 is folded three times: along the score line 53 to form the first adjacent panel 63 on one side of the center panel 64 as an upwardly inclined wall portion of the base member 11; along the score line 52 so that the panel 62 extends downwardly to form an interior vertical wall portion; and, along the score line 51 so that the outermost panel 61 extends from the lower end of the panel 62 to the fold along the score line 53 separating the center panel 64 from the first adjacent panel 63 to define a structural reinforcing part of the base member 1 1.

In like manner, the other side portion 69 is folded along the

score lines

54, 55 and 56 so that the first adjacent panel 65 forms an upwardly inclined side wall portion, the next adjacent side wall 66 forms an interior wall portion, and the outermost panel 67 forms a structural reinforcing part of the base member 1 1.

As shown in FIG. 7, the first adjacent panel 63 on one side of the center panel 64 is provided with a first group of spaced apart, triangularly shaped, or trapezoidally shaped holes 70a which are situated adjacent the second score line 52; and a second group of spaced apart, triangularly shaped holes 70b is provided in the first adjacent panel 65 on the other side of the center panel 64 and adjacent the fifth score line 55. The first and second groups of holes 700 and 70b are laterally aligned with each other so that when the blank 50 is folded along the score lines 51-56, to form the base member 11, the holes 70a and 70b will form part of the openings 28 which extend transversely through the base members 1l-13. The openings 28 are also defined by a third and a fourth group of holes 71a and 71b which are formed respectively in the next

adjacent panels

62 and 66 on either side of the center panel 64. In this respect, the third group of holes 71a is aligned the same plane as the ridge or crest 73 f each base member 1 1-13 as shown in FIGS. 2 and 3. In this way, a load on the pallet will be supported on the crests 72 of the tie members 21-26 and on the crests 73 of the base members 1 l-13.

In like manner, the fourth group of holes 71b is aligned with the second-group of holes 70b. Also, each one of the holes 71b is situated in the panel 66 adjacent the fifth score line 55 and communicates with one of the holes 70b.

When the blank 50 is folded along the score lines 51-56 to form the base member 11, each of the holes V 71a and 71b defines the part of one of the openings 28 which extends through the interior vertical wall portions formed by the

panels

62 and 66.

It will be understood that the holes a, 70b, 71a and 71b, and the openings 28 formed thereby, can be either triangular or trapezoidal fro receiving the tie members 21-26. When the crests 72 of the tie members 21-26 extend slightly above the crests 73 of each of the base members 11-13, the openings 70a-71b will be trapezoidal in form. Moreover, it will be understood that the openings 71a and 71b in the

panels

62 and 66 forming the interior vertical walls are slightly smaller than the openings 70a and 70b in the

panels

63 and 65 which are inclined when the blank 50 is folded to form the base member 11. Additionally, and as previously explained,

With the base members 11-13 constructed in themanner described above, each of the base members 11-13 has two vertical load supporting wall portions and two inclined load supporting wall portions, such that, the portion of each tie member 21-26 which is received through one of the openings 28 in the base member 11 is supported by four

wall portions

62, 63, 65 and 66 of the base member 11'. In this way, the load bearing strength of the base members 11-13 is significantly enhanced.

Alternatively, the base members ll-13 can be formed in the same manner as the tie members 21-26 with overlapping side wall portions. With such an alternative construction of the base members 11-13, the portion of each tie member 21-26 supported by each base member 11-13 will also be supported by four wall portions, all of which are inclined.

When the blank 50 is folded to form the base member 11, the

side portions

68 and 69 are folded to form triangles defining

interior spaces

74 and 75 within the base member 11, as shown in FIG. 6. Preferably, the base members 11-13 and the tie members 21-26 are sized so that one of the base members 21-26 can be received in one of the

spaces

74 or 75 in each of the base members ll-13. The tie member 21 is shown in FIG. 6 positioned in the space 74 of the base member 11. This sizing of the base members 11-13 and the tie members 21-26 are desired so that the disassembled base members ll-13 and tie members 21-26 can be packed in a small space for return shipment.

Moreover, after disassembling the pallet 10, the tie members 21-26 and the base members 11-13 can be unfolded and flattened into their initial form as

blanks

30 and 50 if the panels thereof were not initially secured to each other, such as with an adhesive.

The formation of the base members 11-13 and tie members 21-26 of the pallet from blanks of sheet material as disclosed in FIGS. 4-7 will provide a pallet construction having a sufficient load bearing capacity for handling many types of loads. However, it has been learned empirically that a greater load bearing capacity can be obtained by modifying the construction of the base members and tie members to include interior, vertically extending, structurally reinforcing wall portions, such as the wall portion 109 of a modified base member 111 shown in FIG. 10, and the wall portion 119 of a modified tie member 121 shown in FIG. 8. It will be apparent that the construction of the tie members 121 is very similar to the construction of the base member 111. Accordingly, the construction of the base member 1 11 can be utilized in the construction of tie members 121. Likewise, the construction of the tie member 121 can be utilized in the construction of the base members 1 1 1.

As best shown in FIGS. 8 and 9, the tie member 121 is formed from an elongated blank 130 (FIG. 9) of sheet material. The blank 130 is divided by five score' lines 131-134 into six panels 141-146. To form the tie member 121, the blank 130 is first folded along the score lines 133 to form the

panels

143 and 144 to inclined side wall portions of the tie member 121. Next, the partially folded blank 130 is folded along the

score lines

132 and 134 to properly position the

panels

142 and 145 for forming the base of the tie member 121. At approximately the same time, the blank 130 is'folded along the

score lines

131 and 135 for positioning the

panels

141 and 146 within the hollow interior 148 of the tie member 121 to form the interior wall portion 119 of the tie member 121. It willbe noted that the wall portion 119 is double strength, being formed of two

panels

141 and 146. It will be understood that the tie members 121 can be utilized in place of the tie members 21-26 to form .the pallet 10 or a similar pallet.

Referring now to FIGS. 10 and 11, the base member 111 shown in FIG. 10 is formed from an elongated blank 150 (FIG. 11) of sheet material. The elongated blank 150 is divided by six score lines 151-156 into seven panels 161-167. To form the base member 111, the blank 150 is first folded along the score line 154 to form the

panels

164 and 165 into inclined side wall portions of the base member 111. Next, the partially folded blank 150 is folded along the score lines 153 and 155 to position the panels 163 and 166to proper position for forming the base of the base member 111. At approximately the same time, the partially folded blank 150 is also folded along the score lines 151, 152 and 156 so that the

panels

161, 162 and 167 can be folded inwardly into the interior 168 of the base member 111 to form the interior wall portion 109, which as shown, is formed from three

panels

161, 162 and 167. It will be appreciated that the base member 111 is formed in essentially the same manner as the tie member 121 with the exception of the extra panel 161 which is folded over to provide the triple strength interior wall portion 109. This construction of the base member 111 is somewhat stronger than the construction of the tie member 121, if desired, the tie member 121 can be formed in the same manner as the base member 111 and vice versa.

The base member 111 is also formed with a plurality of transversely extending openings, which are similar to the openings 28 in the base members 11-13. Each opening is adapted to receive and hold a portion of one of the tie members 121. The openings are defined by aligned holes formed in several of the panels 161-167 and spaced along the length of the blank 150. In this respect, the

panels

164 and 165 which form the inclined side wall portions of the base member 111 are provided with groups of aligned holes 170a and 1701). These holes 170a and 170bare located in the

respective panels

164 and 165 adjacent to, but spaced from, the score line 154 as shown in FIG. 11 and define the portion of the openings (in the base member 111) which extend through the side wall portions of the base member 111. The three

panels

161, 162 and 167, which form the vertical interior wall portion 109 of the base member 1 11 also have holes or notches l7la, 171b and 172 formed therein which are aligned with respective holes of the groups of holes 1700 and 17% to form the portion of the openings (in the base member 111) which extend through the interior vertical wall portion 109 of the base member 111. In this respect, the holes v 171a and 17117 are formed in the

panels

161, 162 adthe interior wall portion 109 of the base member 111, t

can be spaced from the upper edge 174 of the interior wall portion 109 so that the opening 171a and l71b will not communicate with each other. In other-words, the

.holes 171a and 17 lb can be formed in a manner similar to the formation of the holes 170a and lb in panels 164 and as shown in FIG. 11.

Likewise, the notches or holes 172 in the panel 167 adjacent the side edge 173 thereof can be formed so that each notch 172 does not open onto the side edge 173.

Preferably, the panels forming the interior wall section in both the base member 111 and the tie member 121 are secured to each other by a suitable adhesive or other fastening means, i.e., the

panels

141 and 146 of the tie member 121 are secured to each other by an adhesive and the

panels

161, 162 and 167 are secured to each other by an adhesive. In this way, a rigid

internal wall structure

109 or 119 is provided in the construction of each base member 111 and each tie member 121.

Referring now to FIG. 12, it will be understood that the lattice structure and the base and tie member construction defining the pallet 10 of the present invention can also be utilized in other applications. For example, the lattice structure can be used as a replacement for studs in a wall framework. In this application, a lattice structure, such as the structure 210, is substituted for wall studs to provide lateral support to wall boards secured to either side thereof. The lattice structure 210 typically has an overall length of approximately 8 feet and an overall width of approximately 4 feet to correspond to the size of conventional 8 inch X 4 inch wall boards.

In FIG. 12, the lattice structure 210 is shown as comprising three base members 211-213 and three tie members 221-223. To facilitate securement of a wall board to each side of the lattice structure 210, some of the tie members 22 l-223 are inverted so that the bases thereof .lie in the same plane to define surface portions to which the wall board can be attached. Thus, the tie members 221 and 223 are positioned so that the inverted base surfaces 231 and 232 thereof are arranged to lie in a plane as close as possible to a plane passing through the apex 234 of each one of the base members 211-213. Also, although the lattice structure 210 is shown as comprising only three tie members, it will be understood that the lattice structure 210 can be formed with more than three tie members.

In addition to the pallet 10, the present invention also includes a kit for construction the pallet as shown in FIGS. 1 to 3. Such a kit includes a plurality of the blanks and 50 (or 130 and 150). For example, a kit for constructing the pallet 10 as sown in FIG. 1 will consist of six of the blanks 30 and three of the blanks 50 preformed with score lines and holes in the manner described above.

Although the present invention contemplates the use of a sheet material which is a double faced corrugated paperboard material, it is to be understood that other sheet materials can be utilized, such as a semi-rigid plastic sheet material.

As another alternative, the pallet of the present invention can be constructed from triangular tubes made from a semi-rigid material, such as a plastic material. Such a modified form of the pallet 10 will include at least two tubular base members each having a triangular cross section, a hollow interior, and a plurality of spaced apart openings formed transversely of and through each base member, together with a plurality of tubular tie members equal in number to the openings in each base member with each tie member having a triangular cross section and a hollow interior.

With the pallet 10 of the present invention constructed in the manner described, a lightweight, inexpensive and disposable pallet is provided. Moreover, a kit for constructing the pallet 10 can be easily assembled and disassembled by unskilled labor without the use of tools or fasteners.

I claim: 1

1. A disposable and reusable pallet comprising at least two parallel spaced, elongated base members interconnected by at least two parallel spaced elongated tie members to form a lattice structure for supporting a load, each of said base members and each of said tie members having a triangular cross section and being formed from a sheet material, and each of said base members having a plurality of triangular or trapezoidal openings formed therein which extend transversely through said base member and which are at least equal in number to the number of tie members, said openings being located at predetermined intervals along said base member and a portion of each one of said tie members being removably and frictionally received in one of said openings in each of said base members,

e ch of saidb e e bers bein orme fro ablan of sheet matefi al av ihg a cent pane and first an second side portions, each of said side portions being folded three times to form three panels, the first panel extending angularly upwardly from said central panel to define an upwardly inclined side wall portion of said base member, the second panel extending vertically downwardly from said first panel to form an interior vertical wall portion and said third panel extending horizontally from the lower end of said second panel to the fold separating said central panel from said first panel and defining a reinforcing structural part of said base member.

2. A kit for constructing a disposable and reusable pallet, said kit including a plurality of first and second elongated blanks formed from a sheet material: said first blank having at least two longitudinally extending score lines dividing said first blank into at least three panels whereby said first blank can be folded along said score lines to form a tie member having a triangular cross section and a hollow interior; said second blank having six longitudinally extending score lines dividing said second blank into seven panels, the center panel defining a base portion of said base member, the first adjacent panel on either side of said center panel defining an upwardly inclined side wall portion of said base member, the next adjacent panel on either side of said center panel defining a vertical interior wall portion of said base member and each one of the outermost panels on either side of said center panel forms a horizontal structural reinforcing part of said base member and overlies one half of said center panel when said second blank is folded along said score lines to form said base member; said second blank also having a first group of triangular or trapezoidal shaped holes in one of said panels and a second group of triangular or trapezoidal shaped holes in another one of said panels, each of said holes of said first group being laterally aligned with one of said holes of said second group so that when said secondblank is folded to form said base member, each pair of said aligned holes will form a triangular or trapezoidal opening extending transversely through said base member for receiving a portion of one of said tie members formed from one of said first blanks.

3. The kit as defined in claim 2 wherein said first group of holes is formed in the first adjacent panel adjacent the second score line which divides said first adjacent panel from said next adjacent panel on one side of said center panel, and said second group of holes is formed in the first adjacent panel adjacent the fifth score line which divides said first adjacent panel from said next adjacent panel on the other side of said center panel, and wherein said second blank has a third group of holes in said next adjacent" panel on said one side of said center panel adjacent said second score line, each of said holes in said third group being laterally aligned with one of said holes of said first group, and a fourth group of holes in said next adjacent panel on said other side of said center panel adjacent said fifth score line, each of said holes of said fourth group being laterally aligned with one of said holes of said second group.

Claims

1. A disposable and reusable pallet comprising at least two parallel spaced, elongated base members interconnected by at least two parallel spaced elongated tie members to form a lattice structure for supporting a load, each of said base members and each of said tie members having a triangular cross section and being formed from a sheet material, and each of said base members having a plurality of triangular or trapezoidal openings formed therein which extend transversely through said base member and which are at least equal in number to the number of tie members, said openings being located at predetermined intervals along said base member and a portion of each one of said tie members being removably and frictionally received in one of said openings in each of said base members, each of said base members being formed from a blank of sheet material having a central panel and first and second side portions, each of said side portions being folded three times to form three panels, the first panel extending angularly upwardly from said central panel to define an upwardly inclined side wall portion of said base member, the second panel extending vertically downwardly from said first panel to form an interior vertical wall portion and said third panel extending horizontally from the lower end of said second panel to the fold separating said central panel from said first panel and defining a reinforcing structural part of said base member.

2. A kit for constructing a disposable and reusable pallet, said kit including a plurality of first and second elongated blanks formed from a sheet material: said first blank having at least two longitudinally extending score lines dividing said first blank into at least three panels whereby said first blank can be folded along said score lines to form a tie member having a triangular cross section and a hollow interior; said second blank having six longitudinally extending score lines dividing said second blank into seven panels, the center panel defining a base portion of said base member, the first adjacent panel on either side of said center panel defining an upwardly inclined side wall portion of said base member, the next adjacent panel on either side of said center panel defining a vertical interior wall portion of said base member and each one of the outermost panels on either side of said center panel forms a horizontal structural reinforcing part of said base member and overlies one half of said center panel when said second blank is folded along said score lines to form said base member; said second blank also having a first group of triangular or trapezoidal shaped holes in one of said panels and a second group of triangular or trapezoidal shaped holes in another one of said panels, each of said holes of said first group being laterally aligned with one of said holes of said second group so that when said second blank is folded to form said base member, each pair of said aligned holes will form a triangular or trapezoidal opening extending transversely through said base member for receiving a portion of one of said tie members formed from one of said first blanks.

3. The kit as defined in claim 2 wherein said first group of holes is formed in the first adjacent panel adjacent the second sCore line which divides said first adjacent panel from said next adjacent panel on one side of said center panel, and said second group of holes is formed in the first adjacent panel adjacent the fifth score line which divides said first adjacent panel from said next adjacent panel on the other side of said center panel, and wherein said second blank has a third group of holes in said next adjacent panel on said one side of said center panel adjacent said second score line, each of said holes in said third group being laterally aligned with one of said holes of said first group, and a fourth group of holes in said next adjacent panel on said other side of said center panel adjacent said fifth score line, each of said holes of said fourth group being laterally aligned with one of said holes of said second group.