CA1181720A - Plastic closure for containers - Google Patents
Plastic closure for containersInfo
- Publication number
- CA1181720A CA1181720A CA000403727A CA403727A CA1181720A CA 1181720 A CA1181720 A CA 1181720A CA 000403727 A CA000403727 A CA 000403727A CA 403727 A CA403727 A CA 403727A CA 1181720 A CA1181720 A CA 1181720A
- Authority
- CA
- Canada
- Prior art keywords
- closure
- top panel
- pilfer
- sealing member
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
- B65D41/34—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt
- B65D41/3423—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with flexible tabs, or elements rotated from a non-engaging to an engaging position, formed on the tamper element or in the closure skirt
- B65D41/3428—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with flexible tabs, or elements rotated from a non-engaging to an engaging position, formed on the tamper element or in the closure skirt the tamper element being integrally connected to the closure by means of bridges
-
- 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
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
- B65D41/34—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt
- B65D41/3423—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with flexible tabs, or elements rotated from a non-engaging to an engaging position, formed on the tamper element or in the closure skirt
Abstract
ABSTRACT OF THE DISCLOSURE
A plastic closure having pilfer-proofing characte-ristics for a container including a mouth-neck portion having formed on its peripheral surface an external thread and an annular flange located beneath it. The closure includes a top panel wall and a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall. A breakable line extending circumferential is formed on the skirt wall to divide the skirt wall into a main portion above the breakable line and a pilfer-proof bottom portion below it, and an internal thread adapted to be fitted with the external thread of the mouth neck portion of the container is formed on the inner surface of the main portion of the skirt wall. The inner surface of the pilfer-proof bottom portion has formed therein at least one flap extending radially inwardly therefrom.
A plastic closure having pilfer-proofing characte-ristics for a container including a mouth-neck portion having formed on its peripheral surface an external thread and an annular flange located beneath it. The closure includes a top panel wall and a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall. A breakable line extending circumferential is formed on the skirt wall to divide the skirt wall into a main portion above the breakable line and a pilfer-proof bottom portion below it, and an internal thread adapted to be fitted with the external thread of the mouth neck portion of the container is formed on the inner surface of the main portion of the skirt wall. The inner surface of the pilfer-proof bottom portion has formed therein at least one flap extending radially inwardly therefrom.
Description
PLAS~IC CLOSURE FOR CONTAINERS
FIELD OF ~HE INVENTION
This invention relates to a plastic closure for containers, and more specifically t -to a plastlc closure having a top panel wall and a cylindrical skirt wall extending downwardly from the peripheral edge of the -top panel wallO
D~SCRIP~ION OF THE PRIOR ART
Metallic closures made of a metallic material such as an aluminum-base alloy have been in widespread use as closures of containers such as bot-tles for li~uors and beveragesO ~he recen-t tendencey is that these metallic container closures have been superseded by plastic closures made of suitable plastic materialsO
~5 Japanese Laid-Open Patent Publication NoO 83588/1979 discloses a plastic closure having pilfer-proofing charac-teristics(designed to prevent unfair activities such as pilferage and exchanging of the contents)O This type of container closure has a top panel wall and a cylindric~l skirt wall ex-tending downwardly from -the peripheral edge of the top panel wallO A breakable line extending circum-ferentially is formed in the skirt wall to divide it into a main portion above the breakable line and a pilfer-proof bottom portion below the breakable llne~ An internal thread is formed on the inner surface of the main portion of the skirt wallO The pilfer-proof bottom portion of the skirt wall is stamped at a plurality of positions spaced from each other circumferentially to form tongue-like pieces protruding radially inwardly and axially ~0 upwardly~
~ his type of closure is applied to a container with a mouth-neck portion in an ordinary form having an exter~
nal thread on its peripheral surface and an annular flange located benea-th the external -thread. In mounting
FIELD OF ~HE INVENTION
This invention relates to a plastic closure for containers, and more specifically t -to a plastlc closure having a top panel wall and a cylindrical skirt wall extending downwardly from the peripheral edge of the -top panel wallO
D~SCRIP~ION OF THE PRIOR ART
Metallic closures made of a metallic material such as an aluminum-base alloy have been in widespread use as closures of containers such as bot-tles for li~uors and beveragesO ~he recen-t tendencey is that these metallic container closures have been superseded by plastic closures made of suitable plastic materialsO
~5 Japanese Laid-Open Patent Publication NoO 83588/1979 discloses a plastic closure having pilfer-proofing charac-teristics(designed to prevent unfair activities such as pilferage and exchanging of the contents)O This type of container closure has a top panel wall and a cylindric~l skirt wall ex-tending downwardly from -the peripheral edge of the top panel wallO A breakable line extending circum-ferentially is formed in the skirt wall to divide it into a main portion above the breakable line and a pilfer-proof bottom portion below the breakable llne~ An internal thread is formed on the inner surface of the main portion of the skirt wallO The pilfer-proof bottom portion of the skirt wall is stamped at a plurality of positions spaced from each other circumferentially to form tongue-like pieces protruding radially inwardly and axially ~0 upwardly~
~ his type of closure is applied to a container with a mouth-neck portion in an ordinary form having an exter~
nal thread on its peripheral surface and an annular flange located benea-th the external -thread. In mounting
- 2-~-the closure on the moutb neck portion of the container and sealing lt, the closure is put over -the mouth-neck portion and turned untll the lnternal thread formed on the inner surface of the main portion of -the skirt wall is fitted with the ex-ternal thread formed on -the peripheral surface of the mouth-neck portion of the containerO
At this time, the tongue-like pieces formed in the pilfer-proof bottom portion of the skirt wall a.re elastically bent radially outwardly by the action of the annular flange formed on the peripheral surface of -the mouth-neck portionO Consequently, the tongue-like pieces pass over the ~nnular flange and en~age the lower surface of the annular flange by elas-ticall~ returning to their original stateD l'o remove the closure from the mouth-neck portion of the con-tainer~ it is turned in a direction reverse to that in mounting ito This turning movement causes the internal thread of the closure to move along the external thread of the mouth neck portion of the containerO
Hence, as soon as the closure is turned, it tends to move axially upwardlyO However~ the tongue-like pieces formed in the pi]fer-proof bottom portion of -the skirt wall resist the axiall~ upward movement of the closure because they are kept in engagement with the annular flan~e formed on the peripheral surface of the mouth-neck portion of the containerO As a result, a considerable force is exerted on ~he breakable line formed in the skirt wall to break the skirt wall along the breakable lineu After this, the closure, or more specifically its top panel wall and the main portion of its skirt wall, can easily move axially upwardly and be removed from the mouth portion of the containerO
The kno~ pilfer-proof plastic closure described above, however, has the following problems to be solvedO
(a) After a suitable plaætic molding step such as inJection molding, the pilfer-proof bottom portion must be stamped in order to form the tongue-like piecesO
Hence, the production of such closures is relfltively complex and expensiveO
(b) As a result of forming the tongue-llke pieces by stamping~ ~ plurallty of rela-tive].y large openings corresponding to the tongue-like pieces are formecl i.rl the pilfer-proof bottom portionO Dust or other ~orelgn mat-ter is likely to gather in -these openlngs to ~ive rlse to a sanitary problemO
(c) Whlle the closure is mounted on the mouth-neck portion of the container, the tongue-llke pieces coul~ be displaced radlally outwardly by, for example, inserting metallic wires through the above-mentioned openings and hooking up the tongue-like pieces with these wiresO
Accordingly, the closure could be removed from the mouth~
neck portion of the container without breaking the breakable line, and the pilfer-proofing characteristics of the closure will be relatively easily impairedO
(d) The tongue-like pieces are formed by forcibly displacing a part of the pilfer-proo~ bottom portion radially inwardly in the stamping step, and after the completion of a step o.~ molding a plastic, for example by injection molding, and before the stamping step, these tongue-like pieces do not protrude radially inwardlyO
Accordingly, when they are bent radially outwardly by the action of the annular flange in mounting the closure on the mouth-neck portion o:E the container, they tend to remain displaced radial.ly outwardly without being suffi-ciently turne~ radially inwardly after they have passed over the annular flange~ It is impossible therefore to insure sufficient pilfer-proofing characteristicsO
In addition, conventional plastic closures also have the following problemsO In a container closure having a top panel wall and a cylindrical skirt wall extending downwardly from the periphe.ral edge of the top panel wall, it i~ normally important to provide the inner surface of the -top panel wall with a sealing member kept in intimate contact with the open end edge of -the mouth of a containerO
The sealing member may be formed as an in-tegral unit with the inner surface o.~ the top panel wall~ But frequently the main body of the closure having the top panel w~ll and the skirt wall and the seallng member are made of different plastic materials because it is generally clesi-rable that the -top panel wall and the skirt wall s~owld be relatively rigid, whereas -the sealing member should be relatively flexible in view o~ the need -to seal -the mouth-neck portion of the container fullyO
In forming the main body of the closure and thesealing member from differen-t plastic materialsg i-t is the conventional. practice to form -the main body of the closure and the sealing member quite separately, and then insert the sealing member ln the inner suface of the top panel wall of the closureO In inser-ting the sealing member in the inner surface of the top panel wall, the sealing member is bonded to the ilmer surface of the top panel wall through an adhesive interposed therebetween in order to prevent detachmen-t of the sealing member from the inner surface of the top panel wallO Accordingly, the need to interpose an adhe~cive be~tween the sealing member and the inner surface of the -top panel wall makes the entire production process rela-tively complexO Another defect is that the adhesive so applied gives off an offensive smell which is likely to affect the flavor and taste of an article filled in the containerO
In an attempt to remove these defects, the specifi-cation of Japanese Laid-Open Patent Publica-tion NoO 113651/1979 discloses a method which involves first forming the main body of the closure (or the sealing member), then formi.ng the sealing member (or the main body of the closure) posî-tioned in place with respect to ~he main body of the closure (or the sealing member), and ~5 forming, during the formation of the above par-ts, an engaged portion which engages both the main body of the closure and the sealing member thereby preventing the disengagement of both in the axial direction~ In a plas-tic closure made by this method, the presence of an adhesive between the sealing member and -the inner surface of the top panel of -the closure is no-t necessary, anc1 therefore~ it is free from the above defec-ts ascribable to the adhesive~ Cer-tainly, -the axial disengagement of the main body of the closure from the seal-ing member can be prevented by the action of the engaged portion in the plastic closure disclosed in -the above-cited Japanese patent document, by the engaged portion exercises no control over the rela-tiYe ro-ta-tion of -the main bocly of the closure and the sealing member and they can rotate freely relative to each otherO r~herefore, while the closure is mounted on and seals the mouth-neck por-tion of a container, the sealing member is pressed against the open end edge of -the mouth portion of the container fairly strongly and thus clings to it with a fairly great force~ To open the container, the main body of the closure is rotated in the opening direction by holding the outside su:rface of -the main body with fingersO
When the main body of the closure and the sealing member can freely rotate relative to each o-ther, the rotation of the main body of the closure in the opening direc-tion does not result in the incidental rotation of the sealing memberO The sealing member remains clinging to the open end edge of the mouth portion of the container, and tends to remain inseparable from the open end edge of the mouth-neck portion of the container until the main body of the closure is raised a considerable amount in the axial direction in response to the rotation of the main body of the closure and correspondingly the sealing member is raised a considerable amount in the axial direction~
~hi~ tendency frequently causes undesirable incidents;
for example, the opening of -the mouth por-tion of the container is not fully and smoothly achieved, and an excessivel~- large ~orce is reguired for i.ts openingO
SU~ARY OF TXE INVENTION
~ firs-t ob~jec-t of this invention is -to provicle an improved plastic closure for containers, which has pil:Eer-proofing characteristics and gives ~ solution to the aforesaid problems (a) to (d) lnherent to known pilfer-proof plas-ti.c closuresO
A second obJect of this invention is to provide an improved plastic closure for containers, in which -the main body of -the closure and a sealing member are formed of different plastic ma-terials, and the relative ro-tation of the main body of the closure and the sealing member can be accurately prevented wi-thout the need to use an adhesive, thereby overcoming the aforesaid defects or problems associated with conventional plas-tic closures~
To achie~e the first object, the present invention provides a pilfer proof plastic closure for a container with a mouth-neck portion having formed on its peripheral surface an external thread and an annul.ar flange located beneath it, sa-Ld plas-tic closure including a top panel wall and a cyl:indrical skirt wall ex-tending downwardly from the peripheral edge of the top panel wall, said skirt wall hav:ing a breakable line extending circumferen-tially to divide it into a main portion above the break-~ble line and a piler-proof bottom por-tion below it, and the inner surface of said main portion having formed therein an internal thread adapted to be fitted with the external thread of the mouth-neck portion of the container, the inner surface of the pilfer-proof bottom portion ha~ing formed t'nerein at least one flap extending there-from radially inwardly, said flap being able to p2SS
o~er the annular flange of the contai-ner by being elasti cally bent when mounting the closure on the mouth-neck ~5 portion of the container, and when the closure has been fully fitted with the mouth-neck portion of the container, the fl~p which has passed over the annular flange re-turn-ing elastic~lly to its original state and its upper edge engaging the lower surface of the annular flangeO
To achieve -the seconcl objectt the present invention provides A plastic closure for containers, comprising a main body having a top panel wall and a ski:rt wall extencl--i.ng downwardly from the peripheral edge of the top panel wall and a sealing member disposed on the inside surface of the top panel wal.1 of the mRin body, said main body and the sealing member being formed of differen-t plastic materials having different properties, and the inner surface of the top panel wall or the upper end portion o~ the inside surface of the skirt wall and the upper surface or circumferential side surface of the sealing member respectively having formed therein rotation-preventing engaging portions which are engaged with each other to prevent the relative rotation of the main body and the sealing member~
20 ~ r~ 7 ~
Figure 1 is a partly broken-away perspectlve view of one embodiment of the plastic closure constructed in ~ccordance with this invention;
~ igure ~ is a side elevation, partly in section, of the closure shown in Figure 1 as it is mounted on and seals the mouth-neck por-tion of a container;
~igure 3 is a side elevation of the mouth-neck portion of a container to which the closure shown in Figure 1 is to be applied;
Figure 4-A isa partial? sectional view showing the behavior o~ a flap in mounting the closure of Figure ~ on t-he mouth-neck por-tion of a container;
Figure 4-B is a partial sectional view taken along line 4-B - 4-B in Figure 4-A;
Figure 5 is a partial 5 perspective view of a second embodiment of the p~astic closure constructed in ;I.L~
accordance wi-th this invention;
Figure 6 is a side elevation, partl~ in section, of the closure of Figure 5 as it is mounted on and se~ls the mouth-neck portion of a con-tainer;
Figure 7-A is a partial,sectional view showing -the beh~vior of a flap in mounting -the closure of Figure 5 on the mouth-neck portion Or a container;
Figure 7-B is a par-tia], sectional view taken along line 7-B - 7-B in Figure 7-A, Figures 8, 9 and 10 are partial, perspective views showing modifications of the flap;
Figure 11 is a side elevation~ partly in section, of still another embodiment of the plastic closure constructed in accordance with this invention;
Figure 12 is a sectional view taken along line 12-12 of Figure 11;
Figure 13 is a side eleva-tion, partly in section, of the closure shown in Figure 11 as it is mounted on the mouth-neck portion of a container;
Figures 14 and 16 are side elevations, partly in section, of mod:ifications of rotation-preventing engaging portions provided respectively in the main body of a con-tainer closure and a sealing member; and Figures 15 and 17 are sectional views taken on line 15-15 of Figure 14 and line 17-17 of Figure 16, respecti-vely~
DE_AIL~D DESCRIPTION OF THE PR~FERRED EMBODIMENTS
One specific embodiment of the plastic container closure constructed in accordance with this invention is described with reference to Fi~ures 1 and 2. ~he illust~
rated container closure shown generally at 2 is molded as a one-piece unit from a suitable plastic material such as polyethylene or polypropylene by a suitable method such as injection molding or press formin~O The closure 2 has a circular top panel wall 4 and a cylindrical skirt wall 6 ext;endir1g clownwardly from -the peripheral edge of the top panel wall 4~ The inner surface of the top panel wall ~ has for~ed -therein an annular sealing ~ember 8 projecting downwardly -the:refrom as a one-piece unit~
A circumferen-tially extending breakable li~e 10 i.s formed on the skir-t wall 6 -to divide the skirt wall 6 into a main portion 12 above the brea~able line ~0 and a pilfer proof bottom por-tion 14 below -the breakable line lO.
The breakable line shown in the drawings consists of a plurality of circumferentially spaced slits ~6 and "bridging portions" 18 loca-ted between the slits 16, and the pilfer-proof bottom portion 1~L is connected to -the main portion 12 by the bridging portions 18~ ~n in-ternal thread 20 ls ~ormed on the inner surface of the main portion 12 of the skirt wall 6, and the outside surface of the main portion 12 is knurled to enable -the closure 2 to be surely and easily held and rotated with fingersO
The aforesaid construction of the closure 2 shown does not constitute the novel features of the closure of this invention, and is know per seO
According to this invention, one or more, preferably a pluralit~ of~ circumferentially spaced flaps 22 are for~ed on the inner surface of the pilfer-proof bottom portion 14 of the skirt wall 60 In the illustrated embodiment, six flaps 22 are formed circumferentially at equal intervals (only partly shown in the drawings)~
Each of the flaps 22 ex-tends obliguely in an axially upward direction and a radially inward direction from its lower edge co~nected to the inner surface of -the pilfer-proof bottom portion 140 Now, with reference to Figures 2 and 3, one exampleof the mouth neck portion of a con-tainer to which the closure 2 of the invention is to be applied will be describedO The mouth-neck portion shown general]y at 24 has formed on i-ts peripheral surface an external thread 26 corresponding to the in-ternal thread 20 formed in the closure 2~ and acljacent -to, and beneath, the ex-ternal ~hread 26 is formed an annular flange 28 having an annular engaging surface 30 a-t its lower end. rrhe mouth-neck portion 24 itself is in a usual form and is provi-led in containers widely dis-tri`buted on -the marketO There lc-, no need to produce it specially ~or the closure 2 of this inventionO
To seal the mouth-neck por-tion 24 shown in Figure
At this time, the tongue-like pieces formed in the pilfer-proof bottom portion of the skirt wall a.re elastically bent radially outwardly by the action of the annular flange formed on the peripheral surface of -the mouth-neck portionO Consequently, the tongue-like pieces pass over the ~nnular flange and en~age the lower surface of the annular flange by elas-ticall~ returning to their original stateD l'o remove the closure from the mouth-neck portion of the con-tainer~ it is turned in a direction reverse to that in mounting ito This turning movement causes the internal thread of the closure to move along the external thread of the mouth neck portion of the containerO
Hence, as soon as the closure is turned, it tends to move axially upwardlyO However~ the tongue-like pieces formed in the pi]fer-proof bottom portion of -the skirt wall resist the axiall~ upward movement of the closure because they are kept in engagement with the annular flan~e formed on the peripheral surface of the mouth-neck portion of the containerO As a result, a considerable force is exerted on ~he breakable line formed in the skirt wall to break the skirt wall along the breakable lineu After this, the closure, or more specifically its top panel wall and the main portion of its skirt wall, can easily move axially upwardly and be removed from the mouth portion of the containerO
The kno~ pilfer-proof plastic closure described above, however, has the following problems to be solvedO
(a) After a suitable plaætic molding step such as inJection molding, the pilfer-proof bottom portion must be stamped in order to form the tongue-like piecesO
Hence, the production of such closures is relfltively complex and expensiveO
(b) As a result of forming the tongue-llke pieces by stamping~ ~ plurallty of rela-tive].y large openings corresponding to the tongue-like pieces are formecl i.rl the pilfer-proof bottom portionO Dust or other ~orelgn mat-ter is likely to gather in -these openlngs to ~ive rlse to a sanitary problemO
(c) Whlle the closure is mounted on the mouth-neck portion of the container, the tongue-llke pieces coul~ be displaced radlally outwardly by, for example, inserting metallic wires through the above-mentioned openings and hooking up the tongue-like pieces with these wiresO
Accordingly, the closure could be removed from the mouth~
neck portion of the container without breaking the breakable line, and the pilfer-proofing characteristics of the closure will be relatively easily impairedO
(d) The tongue-like pieces are formed by forcibly displacing a part of the pilfer-proo~ bottom portion radially inwardly in the stamping step, and after the completion of a step o.~ molding a plastic, for example by injection molding, and before the stamping step, these tongue-like pieces do not protrude radially inwardlyO
Accordingly, when they are bent radially outwardly by the action of the annular flange in mounting the closure on the mouth-neck portion o:E the container, they tend to remain displaced radial.ly outwardly without being suffi-ciently turne~ radially inwardly after they have passed over the annular flange~ It is impossible therefore to insure sufficient pilfer-proofing characteristicsO
In addition, conventional plastic closures also have the following problemsO In a container closure having a top panel wall and a cylindrical skirt wall extending downwardly from the periphe.ral edge of the top panel wall, it i~ normally important to provide the inner surface of the -top panel wall with a sealing member kept in intimate contact with the open end edge of -the mouth of a containerO
The sealing member may be formed as an in-tegral unit with the inner surface o.~ the top panel wall~ But frequently the main body of the closure having the top panel w~ll and the skirt wall and the seallng member are made of different plastic materials because it is generally clesi-rable that the -top panel wall and the skirt wall s~owld be relatively rigid, whereas -the sealing member should be relatively flexible in view o~ the need -to seal -the mouth-neck portion of the container fullyO
In forming the main body of the closure and thesealing member from differen-t plastic materialsg i-t is the conventional. practice to form -the main body of the closure and the sealing member quite separately, and then insert the sealing member ln the inner suface of the top panel wall of the closureO In inser-ting the sealing member in the inner surface of the top panel wall, the sealing member is bonded to the ilmer surface of the top panel wall through an adhesive interposed therebetween in order to prevent detachmen-t of the sealing member from the inner surface of the top panel wallO Accordingly, the need to interpose an adhe~cive be~tween the sealing member and the inner surface of the -top panel wall makes the entire production process rela-tively complexO Another defect is that the adhesive so applied gives off an offensive smell which is likely to affect the flavor and taste of an article filled in the containerO
In an attempt to remove these defects, the specifi-cation of Japanese Laid-Open Patent Publica-tion NoO 113651/1979 discloses a method which involves first forming the main body of the closure (or the sealing member), then formi.ng the sealing member (or the main body of the closure) posî-tioned in place with respect to ~he main body of the closure (or the sealing member), and ~5 forming, during the formation of the above par-ts, an engaged portion which engages both the main body of the closure and the sealing member thereby preventing the disengagement of both in the axial direction~ In a plas-tic closure made by this method, the presence of an adhesive between the sealing member and -the inner surface of the top panel of -the closure is no-t necessary, anc1 therefore~ it is free from the above defec-ts ascribable to the adhesive~ Cer-tainly, -the axial disengagement of the main body of the closure from the seal-ing member can be prevented by the action of the engaged portion in the plastic closure disclosed in -the above-cited Japanese patent document, by the engaged portion exercises no control over the rela-tiYe ro-ta-tion of -the main bocly of the closure and the sealing member and they can rotate freely relative to each otherO r~herefore, while the closure is mounted on and seals the mouth-neck por-tion of a container, the sealing member is pressed against the open end edge of -the mouth portion of the container fairly strongly and thus clings to it with a fairly great force~ To open the container, the main body of the closure is rotated in the opening direction by holding the outside su:rface of -the main body with fingersO
When the main body of the closure and the sealing member can freely rotate relative to each o-ther, the rotation of the main body of the closure in the opening direc-tion does not result in the incidental rotation of the sealing memberO The sealing member remains clinging to the open end edge of the mouth portion of the container, and tends to remain inseparable from the open end edge of the mouth-neck portion of the container until the main body of the closure is raised a considerable amount in the axial direction in response to the rotation of the main body of the closure and correspondingly the sealing member is raised a considerable amount in the axial direction~
~hi~ tendency frequently causes undesirable incidents;
for example, the opening of -the mouth por-tion of the container is not fully and smoothly achieved, and an excessivel~- large ~orce is reguired for i.ts openingO
SU~ARY OF TXE INVENTION
~ firs-t ob~jec-t of this invention is -to provicle an improved plastic closure for containers, which has pil:Eer-proofing characteristics and gives ~ solution to the aforesaid problems (a) to (d) lnherent to known pilfer-proof plas-ti.c closuresO
A second obJect of this invention is to provide an improved plastic closure for containers, in which -the main body of -the closure and a sealing member are formed of different plastic ma-terials, and the relative ro-tation of the main body of the closure and the sealing member can be accurately prevented wi-thout the need to use an adhesive, thereby overcoming the aforesaid defects or problems associated with conventional plas-tic closures~
To achie~e the first object, the present invention provides a pilfer proof plastic closure for a container with a mouth-neck portion having formed on its peripheral surface an external thread and an annul.ar flange located beneath it, sa-Ld plas-tic closure including a top panel wall and a cyl:indrical skirt wall ex-tending downwardly from the peripheral edge of the top panel wall, said skirt wall hav:ing a breakable line extending circumferen-tially to divide it into a main portion above the break-~ble line and a piler-proof bottom por-tion below it, and the inner surface of said main portion having formed therein an internal thread adapted to be fitted with the external thread of the mouth-neck portion of the container, the inner surface of the pilfer-proof bottom portion ha~ing formed t'nerein at least one flap extending there-from radially inwardly, said flap being able to p2SS
o~er the annular flange of the contai-ner by being elasti cally bent when mounting the closure on the mouth-neck ~5 portion of the container, and when the closure has been fully fitted with the mouth-neck portion of the container, the fl~p which has passed over the annular flange re-turn-ing elastic~lly to its original state and its upper edge engaging the lower surface of the annular flangeO
To achieve -the seconcl objectt the present invention provides A plastic closure for containers, comprising a main body having a top panel wall and a ski:rt wall extencl--i.ng downwardly from the peripheral edge of the top panel wall and a sealing member disposed on the inside surface of the top panel wal.1 of the mRin body, said main body and the sealing member being formed of differen-t plastic materials having different properties, and the inner surface of the top panel wall or the upper end portion o~ the inside surface of the skirt wall and the upper surface or circumferential side surface of the sealing member respectively having formed therein rotation-preventing engaging portions which are engaged with each other to prevent the relative rotation of the main body and the sealing member~
20 ~ r~ 7 ~
Figure 1 is a partly broken-away perspectlve view of one embodiment of the plastic closure constructed in ~ccordance with this invention;
~ igure ~ is a side elevation, partly in section, of the closure shown in Figure 1 as it is mounted on and seals the mouth-neck por-tion of a container;
~igure 3 is a side elevation of the mouth-neck portion of a container to which the closure shown in Figure 1 is to be applied;
Figure 4-A isa partial? sectional view showing the behavior o~ a flap in mounting the closure of Figure ~ on t-he mouth-neck por-tion of a container;
Figure 4-B is a partial sectional view taken along line 4-B - 4-B in Figure 4-A;
Figure 5 is a partial 5 perspective view of a second embodiment of the p~astic closure constructed in ;I.L~
accordance wi-th this invention;
Figure 6 is a side elevation, partl~ in section, of the closure of Figure 5 as it is mounted on and se~ls the mouth-neck portion of a con-tainer;
Figure 7-A is a partial,sectional view showing -the beh~vior of a flap in mounting -the closure of Figure 5 on the mouth-neck portion Or a container;
Figure 7-B is a par-tia], sectional view taken along line 7-B - 7-B in Figure 7-A, Figures 8, 9 and 10 are partial, perspective views showing modifications of the flap;
Figure 11 is a side elevation~ partly in section, of still another embodiment of the plastic closure constructed in accordance with this invention;
Figure 12 is a sectional view taken along line 12-12 of Figure 11;
Figure 13 is a side eleva-tion, partly in section, of the closure shown in Figure 11 as it is mounted on the mouth-neck portion of a container;
Figures 14 and 16 are side elevations, partly in section, of mod:ifications of rotation-preventing engaging portions provided respectively in the main body of a con-tainer closure and a sealing member; and Figures 15 and 17 are sectional views taken on line 15-15 of Figure 14 and line 17-17 of Figure 16, respecti-vely~
DE_AIL~D DESCRIPTION OF THE PR~FERRED EMBODIMENTS
One specific embodiment of the plastic container closure constructed in accordance with this invention is described with reference to Fi~ures 1 and 2. ~he illust~
rated container closure shown generally at 2 is molded as a one-piece unit from a suitable plastic material such as polyethylene or polypropylene by a suitable method such as injection molding or press formin~O The closure 2 has a circular top panel wall 4 and a cylindrical skirt wall 6 ext;endir1g clownwardly from -the peripheral edge of the top panel wall 4~ The inner surface of the top panel wall ~ has for~ed -therein an annular sealing ~ember 8 projecting downwardly -the:refrom as a one-piece unit~
A circumferen-tially extending breakable li~e 10 i.s formed on the skir-t wall 6 -to divide the skirt wall 6 into a main portion 12 above the brea~able line ~0 and a pilfer proof bottom por-tion 14 below -the breakable line lO.
The breakable line shown in the drawings consists of a plurality of circumferentially spaced slits ~6 and "bridging portions" 18 loca-ted between the slits 16, and the pilfer-proof bottom portion 1~L is connected to -the main portion 12 by the bridging portions 18~ ~n in-ternal thread 20 ls ~ormed on the inner surface of the main portion 12 of the skirt wall 6, and the outside surface of the main portion 12 is knurled to enable -the closure 2 to be surely and easily held and rotated with fingersO
The aforesaid construction of the closure 2 shown does not constitute the novel features of the closure of this invention, and is know per seO
According to this invention, one or more, preferably a pluralit~ of~ circumferentially spaced flaps 22 are for~ed on the inner surface of the pilfer-proof bottom portion 14 of the skirt wall 60 In the illustrated embodiment, six flaps 22 are formed circumferentially at equal intervals (only partly shown in the drawings)~
Each of the flaps 22 ex-tends obliguely in an axially upward direction and a radially inward direction from its lower edge co~nected to the inner surface of -the pilfer-proof bottom portion 140 Now, with reference to Figures 2 and 3, one exampleof the mouth neck portion of a con-tainer to which the closure 2 of the invention is to be applied will be describedO The mouth-neck portion shown general]y at 24 has formed on i-ts peripheral surface an external thread 26 corresponding to the in-ternal thread 20 formed in the closure 2~ and acljacent -to, and beneath, the ex-ternal ~hread 26 is formed an annular flange 28 having an annular engaging surface 30 a-t its lower end. rrhe mouth-neck portion 24 itself is in a usual form and is provi-led in containers widely dis-tri`buted on -the marketO There lc-, no need to produce it specially ~or the closure 2 of this inventionO
To seal the mouth-neck por-tion 24 shown in Figure
3 by applying the closure 2 shown in ~igure 1, the closur closure 2 is fittingly put over -the mouth-neck por-tion 24 and rotated in a clockwise direction as viewed from above in Figure 2n This resul-ts in the fitting of the internal thread 20 of the closure 2 with the external thread 26 of the mouth-neck portion 24, and as a result, -the closure 2 is moved axially downwardly as it rotatesO When the closure 2 is moved do~lwardly, the flaps 22 formed in -the closure 2 pass o~er the e~ternal thread 26 formed in the mouth-neck portion 24 and further go past the annular flange 280 At this time, as shown in Figures 4-A and 4-B~
20 the flaps 22 undergo the action of the anmllar flange 28 and elastically bend radially outwardly with relative ease. Thus, as -the closure 2 moves do~mwardly, the flaps 22 can pass over the annular flange 280 When internal thread 20 of the closure 2 has been fully fi-tted with the 25 external thread 26 of the mouth-neck portion 24 and the closure 2 has been fully mounted on the mouth-neck portion 24 as shown in Figure 3 ~ the flaps 22 comple-tely move past the annular flange 28 and no longer undergo the action of the annular flange and thu~ elastically return to their original state~ As a result, the upper edges of the flaps 22 engage the lower surface of the annular flange 28 ~ i o eO the armular engaging surface 30O In the meantime, the annular sealing member 8 formed on the inner surface of the top panel wall 4 of the closure 2 35 co~es into engagement with the open edge of the mouth-neck portion 24 of the container, thus ensuring sealing of -the mou-th-neck portion 2~10 To open the mouth-neck por-tion 24 of -the sealed container by de-taching the closure 2 ~`rom i-t, the closure 2 is rotated in a direction opposite -to the rotating direction in the mounting opera-tion, -that is, ln a counterclockwise direc-tion as viewed from above in Figure 20 This rotating operation causes the internal thread 20 formed in -the closure 2 to move along -the external thread 26 formed in the mou-th-neck portior 24 of the container, and -the closure 2 tends to move axially upwardlyO The axially upward movement of the closure 2, however, is hampered since the upper edges of the flaps 22 formed on the inner surface of the pilfer-proof bottom por-tion 14 of the closure 2 are kept in engag~ment with the lower surface of the annular flanges 28, or the annular engaging surface 30, of the mouth-neck portion 24.
A considerable stress is therefore exerted on the break-able line 10 formed in the skirt wall 6~ more specifically in its bridging portions ~8 in the illustrated embodiment, 20 to break the breakable line 10 (the bridging portions ~8), whereby the closure 2 is separated in-to the pilfer-proof bottom portion 14 and the remaining portion (the top p~nel wall 4 and the main portion 12 of the skirt wall 6)o Af-ter this, that par-t of the closure 2 which is other than 25 the pilfer-proof bo-t-tom portion 14 can be easily moved axially upwardly, and therefore, as the closure 2 is rotated, this part moves axially upwardly and is removed from the mouth-neck portion 240 ~hus, the container is openedO Meanwhile, the pilfer-proof bottom portion ~4 remains undetached from the mouth-neck portion 240 The closure 2 of the invention described hereinabove can be produced only by a suitable molding operation, for e~ample, by injection molding or press forming, from a suitable plastic material such as polyethylene or poly-propylene, and s-tamping of the molded article subsequent to the molding operation is not necessary. Hence, it can be produced ~imply a-t low costO
~ urthermore, when the closure 2 in accorclance with this invention is ~-ully mounted on the mouth-neck portion 24 of a container to seal it, the flaps 22 fo:rmed on -the inner surface of -the pilfer proof bot-to~ portion 1~L bend elastically with sufficien-t ease in a radially outward direc-tion under the ac-tion o:F the annular flange 28 formed in the mouth neck po:r-tion 24 ~ and go past the annular flange 280 ~hus, according to this invention, the closure 2 can be relatively easily mounted on the mouth-neck portion 24 of the container to seal i.to Since the mounting is relatively easy, the breaka~le line 10 is not likely to be broken at the time of mounting the closure 20 In addi-tion, at a stage when the closure 2 has been produced by a molding operation such as injection molding or press forming, the flaps 22 alrea~y extend radially inwardly from -the inner surface of the pilfer-proof bottom portion 14, and therefore, the flaps 22 are intrinsically of such a form as to extend radially inward-ly from the inner surface of` the pilfer-proof bo-t-tom portion 1~ or -this reason, when the closure 2 has been full.y mounted on the mouth-neck portion 24 and the flaps 22 have moved past the annular flange 28, the flaps 22 elastically return to their original state with certainty, and the pilfer-proofing charac-teristics of -the closure 2 can be insuredO In order -to mee-t fully the requirement that the ~laps 22 should bend relatively easily at the time of mounting the closure 2 on the mouth-neck portion 24 of a container and after the closure 2 has been full~
mounted on the mouth-neck portion 24, the upper edges of the flaps 22 should exactly engage the annular engaging surface 30 of the annular flange 28, it is preferred that each flap 22 should extend at an angle of about 5 to about 5 to about 45 degrees with respec-t to the inner surface of the pilfer-proof bottom portion 14 (that is, the angle ~ in ~igure ~ being about 5 to about 45 degrees~, ~n~ that -the thi.ckness t (see ~igure L~-~) of each flap 22 should be about 005 to about 3~m, although -these values slightly vary with the plastic ma-terial of which the closure 2 is madeO
Furthermore, no opening exi.sts in the pilfer-proof bot-tom portion 1Li of the closure 2 of this inven-tion, an~
as can be easily seen from :Figu:re 2t the flaps 22 are completely covered wi-th the pilfer-proof bo-ttom por-tion 14 when the closure 2 has been moun-ted on the mou-th-neck portion 24D It is impossible -therefore to displace -the flaps 22 radially ou-twardl.y by manipulating them with metallic wires, e-tcO from outsideO This means tha-t the closure 2 cannot be removed from the mouth-neck portion 24 without breaking the breakable line 10, and the pilfer-proofing characteristics of the closure 2 can be insuredO
A second em~odiment of the plastic closure of theinvention is shown in Figures 5 and 6~ In a closure 102 shown in Figures 5 and 6~ a breakable line 110 formed in a skirt wall 106 to divide it into a main portion 112 and 20 a pilfer-proof bottom portion 114 is composed of a score formed by reducing the thickness of the material constitu-ting the closu.re 102 as compared with the remaining portion of the closure 102 and extending continuously over -the en-tire circumference of the skirt wall 106~
One or more, preferably a plurality of, circumferentially spaced flaps 122 formed on the inner surface of the pilfer-proof bottom portion ~14 extend not axially upward-ly from the inner surface of the pilfer-proof bottom portion 114, but radiall.y inwardly from their one side edges connected to the inner surface of the pilfer-proof bot-tom portion 114 in a direction opposite to the rotat-ting direction of the closure ~02 at the time of mountin~
the closure 102 on a mouth-neck por-tion 124 of a container (that is, in a counterclockwise direction as viewed from above in Figure 6)o Otherwise, the construction of the closure 102 shown in Figures 5 and 6 is substantially the sa~e as thAt; of' the closure 2 shown in Figures 1 and 2 Needless to say~ i-t is apparen-t tha-t the closure 102 shown in Figures 5 and 6 exhi'oi-ts su'bs-tantially the same operation and result as -the cl.osure 2 show.~ in Figures 1 and 20 When -the closure 102 is moun-ted on -t~e mouth-neck por-tion ~24 o:E' a con-tainer to seal i,t, -the flaps 122 elastically bend relatively easil.y under the action of an annular flange 128 formed in -the mouth-neck porti,on 124, and can move past the annular flange 128~ as shown in Figu~es 7-.A ~nd 7-Bo When the closure 102 has been fully mounted on the mouth-neck portion 124, -the flaps 122 move past -the annular flange 128 and -thus are released from the action of the annular flange 128O
As a result, they return elastically to -their original state and their upper edges exac-tly engage the annulflr engaging surface 130 of the annular flange 128D
Figures 8 to 10 show modified examples of flaps formed on the inner surface of the pilfer-proof bottom portionO
A flap 222 shown in Figure 8, like -the flaps 22 of the c],osure 2 shown in Figures ~ and 2 ~ ex-tends a~ially upwardly ana radially inwardly but is not of uniform thicknessO Its thickness progressively increases from its lower edge toward i,ts upper edgeO
A flap 322 shown in Figure 9, like the flap 122 Of the closure ~02 shown in Figures 5 and 6, extends radially inwardly from i-ts one edge connected to the inner surface of a pilfer-proof bottom portion 314 in a direction opposite to the rotating direc-tion of the closure at the time of mounting it on -the mouth-neck portion of a contai-ner, but is not of uniform thicknessO As in the flap 22 shown in ~igure 8, its thickness progressivel~ increases from its lower e~ge toward its upper edgeO
Preferably, the upper edges of the flap 222 shoT~n in Figure 8 and the flap 322 shown in Figure 9 have a thickness of about 0O5 to about 3 mm in order -to enable the upper eclges of the flaps to be surely engaged wi-th the jaw of the mouth-neck por-tion of a container and -to surely maintain the pilfer~proofing charac-terlstics of the closures~
~ flap 422 shown in Figure 10, lilce the :f:l.ap ~2 of the closure 102 shown in Figures 5 and 6, ext;ends radially inwardly from i-ts one side edge connec-ted -to the inner surface of a pilfer-proof bottom portion 414 in a direc-tion opposi-te to the ro-ta-ting direction of the closure at the time of mounting it on the mouth-neck por-tion of a container, but i-ts shape is no-t rectan~ularO
The upper edge of -the flap 422 extends substantially horizontally, but i-ts lower edge is inclined upwardly toward its free edge from its one side edge connected to the inner surface of -the pilfer~proof bottom portion 414O
Hence, the width of the flap 422 progressively decreases toward its free edgeO
The flaps 2Z2, 322 and 422 shown in Figures 8 to 10 can elastically bend more easily -than the flaps 22 of the closure 2 shown in ~igures 1 and 2 and the flaps 122 of the closure 10~) shown in ~igures 5 and 60 Figures 11 and 12 show another embodimen-t of the plastic closure constructed in accordance with this inven-tionO A closure shown general].y at 502 is comprised of 25 a main body 503 having a circular -top panel wall 504 and a cylindrical skirt wall 506 extencling downwarcll~T from the peripheral edge of the top panel wall 504 and a sealing member 508 disposed on the inner surface of the top panel wall 504 of the main body 503O The main bod~y 503 and the sealing member 508 are made of different plastic materials having different properties~
Conveniently, th.e main body 503 iS formed of a relatively rigid plastic material such as polypropylene or polyethy-lene, and the sealing member 508 is made o:f a rela-tively 35 flexible plastic ma-terial such as polyvinyl chloride or an ethylene/vin~l acetate copolymer~
The closure 50~ of -the above type can be convenient l.y p.rodaced by first forming the main bo~y 503 by a suitable molding operation such as injection molding or press forming, and then forming -the seallng member 508 directly at a predetermined site of the main body 503 by a suitable molding operation such as injection molding or press formin~0 0r it can also be conveniently produced by first formin~ the sealing member 508 by a suitable method and then forming the main body 503 by a sui-table method in proper re]ation to -the sealing member 508O
A downwardl.y extending projec-tion 505 is cen-trally formed as a one-piece unit on the inner surrace of -the top panel wall 504 of the main boc~y 502O ~S can be easily seen form Figures 11 and 12, -the projection 505 ls 15 frustoconical with its ou-tside diameter progressively increasing downwardlyO A depression 507 having a shape conforming to the projection 505 and engaging the projec-tion 505 is formed centrally on the upper surface of the sealing member 508 which is substantia].ly disk-like as a 20 wholeO It will be apprecia-ted from ~igure 11 that in the illus-tra-ted embodiment, -the detachment of the main body 503 and the sealing member 508 in the a~ial direc-tion (in the vertical direction) is surely prevented by the action of an engaged portion comprised of the projection 505 and the depression 507O If desired, the depression 507 may be caused to extend to the lower surface of -the sealing member 508 SO tha-t the projection 505 formed centrally on the inner surface of the top panei wall 504 of the main body 50~ extends through the sealing member 508 via the depression 507O If further desired, it is possible, contrary to the illustrated embodiment, to form an upwardly e~tending projection centrally on the upper surlace of the sealing member 508 and a corresponding depression cen-trally on the inner surface of -the top panel wall 504 of the main body 503O
It is also important that in the illus-tratecl closure ~17 constructed in accordance with -this i.nven-tion, rotation-preventing en~aging po:rtions should be formed fo:r prevent-ing the relative ro-tation of the main body 503 and the sealing member 508O With refe:rence -to Figure 12 taken 5 together wi-th Figure '11, a plural.ity o:F (8 in -the draw-ings) circumferentially spaced raised portions 509 which proaect radially inwardly and axially downwardly are pro-vided in a boundary area between the peripheral edge of the inner surface of the top panel 504 and the upper end 10 of the inner surface o:f the skirt wall 506~ Correspond~
ingly to the raised portions 509, a plurality of (8 in the drawings) depressed po:rtions 51'1 having a shape corresponding to the raised por-tions 509 and engaging the raised por-tions 509 are formed at circumferen-tially spaced 15 intervals in a boundary area between the peripheral. edge of the upper surface of -the se~ling member 508 and the upper end of the peripheral side surface of -the sealin~
member 5080 The ra~sed portions 509 and the depressed portion 511 kept in engagement with each other form a 20 rotation-pre-~Tenting engaging portion, and as will be easily appreciated from Figures 11 and 12, surely prevent the relative ro-ta-tion of the main body 503 and -the sealing member 5080 Of course, the same operation and result can be obtained by forming a plurality of depressed portions 25 on -the main body 503 and a ~lurality of raised portions on the sealing membe:r 5080 Except the elements described hereinabove, -the construction of -the closure 502 shown in Figures 11 and 15 is substantially the same as that of the closure 2 30 shown in Figures 1 and 2, and therefore, a detailed des-cription of it wi.ll be omitted in this specification.
The closure 502 shown in Figures 11 and 12 can fllso be applied to the mouth-neck portion 24 of a container sho~n in Figure 3~ When the closure 502 is mounted in ~5 position on the mouth-neck portion 24 by the same method as in the case of the closure 2, the sealing member 508 r~
disposed on the inner surface of -t;he top panel wall 504 of the main body 503 is pressed against the open ed~e of the mouth-neck portion 24 and clings firmly to it, -thereby surely sealin~ the mouth-neck portion 24.
In removing the closure 502 from -the mou-th-neck por-tion 24, the main portion 503 is rota-ted in -the same Wfly as in the case of the closure 2 shown in Figures 1 and 2 in the opening direc-tion (iae,, in a counterclockwise direction as viewed from above in Figure 13) by manipu-la-ting -the outside surface of -the main portion 510 of the skirt wall 506 with fingersO As a result, the sealing ~ember 508 is surely rotated in the opening direction following the rotation of the main body 503 since the relative rotation of the main body 503 and the sealing ~5 member 508 is surely prevented by the action of -the rotation-preventing engaging portion comprised of -the raised po~tions 509 and the depressed portions 511O This rotation enables the sealing member 508 to be surely sep~rated from the open edge of the mouth-neck portion 24 to which it has clungO
Figures 'l4 and 15 show another embodiment of the closure of this invention in which a sealin~ member 608 and a main body 60~ of the closure are formed of different plastic materialsO In the clocsure 602 shown in Fi~ures 14 and 15~ a p]urality of radially outwardly projecting raised portions 609 are formed at circumferenti~lly spaced intervals on the peripheral side surface of a projection 605 formed centrally on the inner surface of a top panel wall 504 of the main body 60~o A plurality of depressed portions 611 having a shape conforming to the raised portions 609 and engaging the raised portions 609 are formed on the inner circumferential surface of a depression 607 formed cen-trally on the upper surface of the sealing member 6080 The raised portions 609 and -the ~5 depressed portions 611 constitute a rotation-preventing engaging portion for surely preventing the .rela-tlve rotation of the mai.n body 603 and -the seflling member 608O
E~cept as no~ed above~ the construction of the closure 602 shown in Figures 1L~ and 15 is substan-tially the same as that of the closure 502 shown in F-igures 11 an~ 12 Figures 16 and 17 show s-till ano-the:r e1nbodiment o:~
the closure of this invention in which a sea],ing member 708 is made of a plastic materi~l which is different from the p].astic material from which a main body 703 of a c~osure 702 is formecl~ In the closure 702 shown in Figures 16 and 17, a projection 705 formed centrally on the inner surface of a -top panel wall. 70L~ of the main body 703 is of a polygonal pyramid having a polygonal (in the drawings, regular pentagonal) cross section with its cross sectional area gradually increasing toward its bottomO A depression 707 formed centrally on the upper surface of the sealing member 708 is also of the shape of a polygonal pyramid corresponding to -the shape of the projection 7050 In this closure 702, the engagemen-t of the projection 705 with the depression 707 surely prevents 20 the axial detachment of the main body 703 and the sealing member 708 and also the relative rota-tion of the main body 703 and the sealing membe~r 7080 In o-ther words, the projection 705 and the depression 707 engaged wi-th each other in the cl.osure 702 shown in Figures 16 and 17 const-itute bo-th an engaged portion for preventing the axial detachment of the main body 703 and the sealing member 708 and a rotation-preven-ting engaging por-tion for preventing the relative rotation of the main body 703 and the sealing member 7080 Except as described above, the construction of the closure 702 illustrated in Figures 16 and 17 is substantially the same as that of the closure 502 shown in Figures 11 and 12, It is -to be understood that the rotation-preventing engaging portion provided in the main body of the closu:re and the sealing member as described with reference to Figures 11 to 17 in closures of -the type in which the main body and -the sealing member are formed of diferent plastic rna-terials having different properties is applic-able not only to closures of the specifiecl forms illust-rated in -the drawings and having pilfer-proofing charac-teristics~ but also to cl.osures of o-the:r forms having pilfer-proofing characteris-tics and closures of various forms having no pilfer-proofing characteristicsO
While the plastic closure constructed in ~ccordance with this in~ention has been clescribed in detail with reference to some specific embodiments shown in the accompanying drawings, it .~hould be understood that the present invention is not limi-ted to these specified embodiments, and various changes and modifications are possible without departing from the scope of the invention..
20 the flaps 22 undergo the action of the anmllar flange 28 and elastically bend radially outwardly with relative ease. Thus, as -the closure 2 moves do~mwardly, the flaps 22 can pass over the annular flange 280 When internal thread 20 of the closure 2 has been fully fi-tted with the 25 external thread 26 of the mouth-neck portion 24 and the closure 2 has been fully mounted on the mouth-neck portion 24 as shown in Figure 3 ~ the flaps 22 comple-tely move past the annular flange 28 and no longer undergo the action of the annular flange and thu~ elastically return to their original state~ As a result, the upper edges of the flaps 22 engage the lower surface of the annular flange 28 ~ i o eO the armular engaging surface 30O In the meantime, the annular sealing member 8 formed on the inner surface of the top panel wall 4 of the closure 2 35 co~es into engagement with the open edge of the mouth-neck portion 24 of the container, thus ensuring sealing of -the mou-th-neck portion 2~10 To open the mouth-neck por-tion 24 of -the sealed container by de-taching the closure 2 ~`rom i-t, the closure 2 is rotated in a direction opposite -to the rotating direction in the mounting opera-tion, -that is, ln a counterclockwise direc-tion as viewed from above in Figure 20 This rotating operation causes the internal thread 20 formed in -the closure 2 to move along -the external thread 26 formed in the mou-th-neck portior 24 of the container, and -the closure 2 tends to move axially upwardlyO The axially upward movement of the closure 2, however, is hampered since the upper edges of the flaps 22 formed on the inner surface of the pilfer-proof bottom por-tion 14 of the closure 2 are kept in engag~ment with the lower surface of the annular flanges 28, or the annular engaging surface 30, of the mouth-neck portion 24.
A considerable stress is therefore exerted on the break-able line 10 formed in the skirt wall 6~ more specifically in its bridging portions ~8 in the illustrated embodiment, 20 to break the breakable line 10 (the bridging portions ~8), whereby the closure 2 is separated in-to the pilfer-proof bottom portion 14 and the remaining portion (the top p~nel wall 4 and the main portion 12 of the skirt wall 6)o Af-ter this, that par-t of the closure 2 which is other than 25 the pilfer-proof bo-t-tom portion 14 can be easily moved axially upwardly, and therefore, as the closure 2 is rotated, this part moves axially upwardly and is removed from the mouth-neck portion 240 ~hus, the container is openedO Meanwhile, the pilfer-proof bottom portion ~4 remains undetached from the mouth-neck portion 240 The closure 2 of the invention described hereinabove can be produced only by a suitable molding operation, for e~ample, by injection molding or press forming, from a suitable plastic material such as polyethylene or poly-propylene, and s-tamping of the molded article subsequent to the molding operation is not necessary. Hence, it can be produced ~imply a-t low costO
~ urthermore, when the closure 2 in accorclance with this invention is ~-ully mounted on the mouth-neck portion 24 of a container to seal it, the flaps 22 fo:rmed on -the inner surface of -the pilfer proof bot-to~ portion 1~L bend elastically with sufficien-t ease in a radially outward direc-tion under the ac-tion o:F the annular flange 28 formed in the mouth neck po:r-tion 24 ~ and go past the annular flange 280 ~hus, according to this invention, the closure 2 can be relatively easily mounted on the mouth-neck portion 24 of the container to seal i.to Since the mounting is relatively easy, the breaka~le line 10 is not likely to be broken at the time of mounting the closure 20 In addi-tion, at a stage when the closure 2 has been produced by a molding operation such as injection molding or press forming, the flaps 22 alrea~y extend radially inwardly from -the inner surface of the pilfer-proof bottom portion 14, and therefore, the flaps 22 are intrinsically of such a form as to extend radially inward-ly from the inner surface of` the pilfer-proof bo-t-tom portion 1~ or -this reason, when the closure 2 has been full.y mounted on the mouth-neck portion 24 and the flaps 22 have moved past the annular flange 28, the flaps 22 elastically return to their original state with certainty, and the pilfer-proofing charac-teristics of -the closure 2 can be insuredO In order -to mee-t fully the requirement that the ~laps 22 should bend relatively easily at the time of mounting the closure 2 on the mouth-neck portion 24 of a container and after the closure 2 has been full~
mounted on the mouth-neck portion 24, the upper edges of the flaps 22 should exactly engage the annular engaging surface 30 of the annular flange 28, it is preferred that each flap 22 should extend at an angle of about 5 to about 5 to about 45 degrees with respec-t to the inner surface of the pilfer-proof bottom portion 14 (that is, the angle ~ in ~igure ~ being about 5 to about 45 degrees~, ~n~ that -the thi.ckness t (see ~igure L~-~) of each flap 22 should be about 005 to about 3~m, although -these values slightly vary with the plastic ma-terial of which the closure 2 is madeO
Furthermore, no opening exi.sts in the pilfer-proof bot-tom portion 1Li of the closure 2 of this inven-tion, an~
as can be easily seen from :Figu:re 2t the flaps 22 are completely covered wi-th the pilfer-proof bo-ttom por-tion 14 when the closure 2 has been moun-ted on the mou-th-neck portion 24D It is impossible -therefore to displace -the flaps 22 radially ou-twardl.y by manipulating them with metallic wires, e-tcO from outsideO This means tha-t the closure 2 cannot be removed from the mouth-neck portion 24 without breaking the breakable line 10, and the pilfer-proofing characteristics of the closure 2 can be insuredO
A second em~odiment of the plastic closure of theinvention is shown in Figures 5 and 6~ In a closure 102 shown in Figures 5 and 6~ a breakable line 110 formed in a skirt wall 106 to divide it into a main portion 112 and 20 a pilfer-proof bottom portion 114 is composed of a score formed by reducing the thickness of the material constitu-ting the closu.re 102 as compared with the remaining portion of the closure 102 and extending continuously over -the en-tire circumference of the skirt wall 106~
One or more, preferably a plurality of, circumferentially spaced flaps 122 formed on the inner surface of the pilfer-proof bottom portion ~14 extend not axially upward-ly from the inner surface of the pilfer-proof bottom portion 114, but radiall.y inwardly from their one side edges connected to the inner surface of the pilfer-proof bot-tom portion 114 in a direction opposite to the rotat-ting direction of the closure ~02 at the time of mountin~
the closure 102 on a mouth-neck por-tion 124 of a container (that is, in a counterclockwise direction as viewed from above in Figure 6)o Otherwise, the construction of the closure 102 shown in Figures 5 and 6 is substantially the sa~e as thAt; of' the closure 2 shown in Figures 1 and 2 Needless to say~ i-t is apparen-t tha-t the closure 102 shown in Figures 5 and 6 exhi'oi-ts su'bs-tantially the same operation and result as -the cl.osure 2 show.~ in Figures 1 and 20 When -the closure 102 is moun-ted on -t~e mouth-neck por-tion ~24 o:E' a con-tainer to seal i,t, -the flaps 122 elastically bend relatively easil.y under the action of an annular flange 128 formed in -the mouth-neck porti,on 124, and can move past the annular flange 128~ as shown in Figu~es 7-.A ~nd 7-Bo When the closure 102 has been fully mounted on the mouth-neck portion 124, -the flaps 122 move past -the annular flange 128 and -thus are released from the action of the annular flange 128O
As a result, they return elastically to -their original state and their upper edges exac-tly engage the annulflr engaging surface 130 of the annular flange 128D
Figures 8 to 10 show modified examples of flaps formed on the inner surface of the pilfer-proof bottom portionO
A flap 222 shown in Figure 8, like -the flaps 22 of the c],osure 2 shown in Figures ~ and 2 ~ ex-tends a~ially upwardly ana radially inwardly but is not of uniform thicknessO Its thickness progressively increases from its lower edge toward i,ts upper edgeO
A flap 322 shown in Figure 9, like the flap 122 Of the closure ~02 shown in Figures 5 and 6, extends radially inwardly from i-ts one edge connected to the inner surface of a pilfer-proof bottom portion 314 in a direction opposite to the rotating direc-tion of the closure at the time of mounting it on -the mouth-neck portion of a contai-ner, but is not of uniform thicknessO As in the flap 22 shown in ~igure 8, its thickness progressivel~ increases from its lower e~ge toward its upper edgeO
Preferably, the upper edges of the flap 222 shoT~n in Figure 8 and the flap 322 shown in Figure 9 have a thickness of about 0O5 to about 3 mm in order -to enable the upper eclges of the flaps to be surely engaged wi-th the jaw of the mouth-neck por-tion of a container and -to surely maintain the pilfer~proofing charac-terlstics of the closures~
~ flap 422 shown in Figure 10, lilce the :f:l.ap ~2 of the closure 102 shown in Figures 5 and 6, ext;ends radially inwardly from i-ts one side edge connec-ted -to the inner surface of a pilfer-proof bottom portion 414 in a direc-tion opposi-te to the ro-ta-ting direction of the closure at the time of mounting it on the mouth-neck por-tion of a container, but i-ts shape is no-t rectan~ularO
The upper edge of -the flap 422 extends substantially horizontally, but i-ts lower edge is inclined upwardly toward its free edge from its one side edge connected to the inner surface of -the pilfer~proof bottom portion 414O
Hence, the width of the flap 422 progressively decreases toward its free edgeO
The flaps 2Z2, 322 and 422 shown in Figures 8 to 10 can elastically bend more easily -than the flaps 22 of the closure 2 shown in ~igures 1 and 2 and the flaps 122 of the closure 10~) shown in ~igures 5 and 60 Figures 11 and 12 show another embodimen-t of the plastic closure constructed in accordance with this inven-tionO A closure shown general].y at 502 is comprised of 25 a main body 503 having a circular -top panel wall 504 and a cylindrical skirt wall 506 extencling downwarcll~T from the peripheral edge of the top panel wall 504 and a sealing member 508 disposed on the inner surface of the top panel wall 504 of the main body 503O The main bod~y 503 and the sealing member 508 are made of different plastic materials having different properties~
Conveniently, th.e main body 503 iS formed of a relatively rigid plastic material such as polypropylene or polyethy-lene, and the sealing member 508 is made o:f a rela-tively 35 flexible plastic ma-terial such as polyvinyl chloride or an ethylene/vin~l acetate copolymer~
The closure 50~ of -the above type can be convenient l.y p.rodaced by first forming the main bo~y 503 by a suitable molding operation such as injection molding or press forming, and then forming -the seallng member 508 directly at a predetermined site of the main body 503 by a suitable molding operation such as injection molding or press formin~0 0r it can also be conveniently produced by first formin~ the sealing member 508 by a suitable method and then forming the main body 503 by a sui-table method in proper re]ation to -the sealing member 508O
A downwardl.y extending projec-tion 505 is cen-trally formed as a one-piece unit on the inner surrace of -the top panel wall 504 of the main boc~y 502O ~S can be easily seen form Figures 11 and 12, -the projection 505 ls 15 frustoconical with its ou-tside diameter progressively increasing downwardlyO A depression 507 having a shape conforming to the projection 505 and engaging the projec-tion 505 is formed centrally on the upper surface of the sealing member 508 which is substantia].ly disk-like as a 20 wholeO It will be apprecia-ted from ~igure 11 that in the illus-tra-ted embodiment, -the detachment of the main body 503 and the sealing member 508 in the a~ial direc-tion (in the vertical direction) is surely prevented by the action of an engaged portion comprised of the projection 505 and the depression 507O If desired, the depression 507 may be caused to extend to the lower surface of -the sealing member 508 SO tha-t the projection 505 formed centrally on the inner surface of the top panei wall 504 of the main body 50~ extends through the sealing member 508 via the depression 507O If further desired, it is possible, contrary to the illustrated embodiment, to form an upwardly e~tending projection centrally on the upper surlace of the sealing member 508 and a corresponding depression cen-trally on the inner surface of -the top panel wall 504 of the main body 503O
It is also important that in the illus-tratecl closure ~17 constructed in accordance with -this i.nven-tion, rotation-preventing en~aging po:rtions should be formed fo:r prevent-ing the relative ro-tation of the main body 503 and the sealing member 508O With refe:rence -to Figure 12 taken 5 together wi-th Figure '11, a plural.ity o:F (8 in -the draw-ings) circumferentially spaced raised portions 509 which proaect radially inwardly and axially downwardly are pro-vided in a boundary area between the peripheral edge of the inner surface of the top panel 504 and the upper end 10 of the inner surface o:f the skirt wall 506~ Correspond~
ingly to the raised portions 509, a plurality of (8 in the drawings) depressed po:rtions 51'1 having a shape corresponding to the raised por-tions 509 and engaging the raised por-tions 509 are formed at circumferen-tially spaced 15 intervals in a boundary area between the peripheral. edge of the upper surface of -the se~ling member 508 and the upper end of the peripheral side surface of -the sealin~
member 5080 The ra~sed portions 509 and the depressed portion 511 kept in engagement with each other form a 20 rotation-pre-~Tenting engaging portion, and as will be easily appreciated from Figures 11 and 12, surely prevent the relative ro-ta-tion of the main body 503 and -the sealing member 5080 Of course, the same operation and result can be obtained by forming a plurality of depressed portions 25 on -the main body 503 and a ~lurality of raised portions on the sealing membe:r 5080 Except the elements described hereinabove, -the construction of -the closure 502 shown in Figures 11 and 15 is substantially the same as that of the closure 2 30 shown in Figures 1 and 2, and therefore, a detailed des-cription of it wi.ll be omitted in this specification.
The closure 502 shown in Figures 11 and 12 can fllso be applied to the mouth-neck portion 24 of a container sho~n in Figure 3~ When the closure 502 is mounted in ~5 position on the mouth-neck portion 24 by the same method as in the case of the closure 2, the sealing member 508 r~
disposed on the inner surface of -t;he top panel wall 504 of the main body 503 is pressed against the open ed~e of the mouth-neck portion 24 and clings firmly to it, -thereby surely sealin~ the mouth-neck portion 24.
In removing the closure 502 from -the mou-th-neck por-tion 24, the main portion 503 is rota-ted in -the same Wfly as in the case of the closure 2 shown in Figures 1 and 2 in the opening direc-tion (iae,, in a counterclockwise direction as viewed from above in Figure 13) by manipu-la-ting -the outside surface of -the main portion 510 of the skirt wall 506 with fingersO As a result, the sealing ~ember 508 is surely rotated in the opening direction following the rotation of the main body 503 since the relative rotation of the main body 503 and the sealing ~5 member 508 is surely prevented by the action of -the rotation-preventing engaging portion comprised of -the raised po~tions 509 and the depressed portions 511O This rotation enables the sealing member 508 to be surely sep~rated from the open edge of the mouth-neck portion 24 to which it has clungO
Figures 'l4 and 15 show another embodiment of the closure of this invention in which a sealin~ member 608 and a main body 60~ of the closure are formed of different plastic materialsO In the clocsure 602 shown in Fi~ures 14 and 15~ a p]urality of radially outwardly projecting raised portions 609 are formed at circumferenti~lly spaced intervals on the peripheral side surface of a projection 605 formed centrally on the inner surface of a top panel wall 504 of the main body 60~o A plurality of depressed portions 611 having a shape conforming to the raised portions 609 and engaging the raised portions 609 are formed on the inner circumferential surface of a depression 607 formed cen-trally on the upper surface of the sealing member 6080 The raised portions 609 and -the ~5 depressed portions 611 constitute a rotation-preventing engaging portion for surely preventing the .rela-tlve rotation of the mai.n body 603 and -the seflling member 608O
E~cept as no~ed above~ the construction of the closure 602 shown in Figures 1L~ and 15 is substan-tially the same as that of the closure 502 shown in F-igures 11 an~ 12 Figures 16 and 17 show s-till ano-the:r e1nbodiment o:~
the closure of this invention in which a sea],ing member 708 is made of a plastic materi~l which is different from the p].astic material from which a main body 703 of a c~osure 702 is formecl~ In the closure 702 shown in Figures 16 and 17, a projection 705 formed centrally on the inner surface of a -top panel wall. 70L~ of the main body 703 is of a polygonal pyramid having a polygonal (in the drawings, regular pentagonal) cross section with its cross sectional area gradually increasing toward its bottomO A depression 707 formed centrally on the upper surface of the sealing member 708 is also of the shape of a polygonal pyramid corresponding to -the shape of the projection 7050 In this closure 702, the engagemen-t of the projection 705 with the depression 707 surely prevents 20 the axial detachment of the main body 703 and the sealing member 708 and also the relative rota-tion of the main body 703 and the sealing membe~r 7080 In o-ther words, the projection 705 and the depression 707 engaged wi-th each other in the cl.osure 702 shown in Figures 16 and 17 const-itute bo-th an engaged portion for preventing the axial detachment of the main body 703 and the sealing member 708 and a rotation-preven-ting engaging por-tion for preventing the relative rotation of the main body 703 and the sealing member 7080 Except as described above, the construction of the closure 702 illustrated in Figures 16 and 17 is substantially the same as that of the closure 502 shown in Figures 11 and 12, It is -to be understood that the rotation-preventing engaging portion provided in the main body of the closu:re and the sealing member as described with reference to Figures 11 to 17 in closures of -the type in which the main body and -the sealing member are formed of diferent plastic rna-terials having different properties is applic-able not only to closures of the specifiecl forms illust-rated in -the drawings and having pilfer-proofing charac-teristics~ but also to cl.osures of o-the:r forms having pilfer-proofing characteris-tics and closures of various forms having no pilfer-proofing characteristicsO
While the plastic closure constructed in ~ccordance with this in~ention has been clescribed in detail with reference to some specific embodiments shown in the accompanying drawings, it .~hould be understood that the present invention is not limi-ted to these specified embodiments, and various changes and modifications are possible without departing from the scope of the invention..
Claims (17)
1. For use in a container including a mouth-neck portion having formed on its peripheral surface an external thread and an annular flange located beneath it, a pilfer-proof plastic closure comprising a top panel wall and a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall, said skirt wall having a breakable line extending circumferentially to divide it into a main portion above the breakable line and a pilfer-proof bottom portion below it, and the inner surface of said main portion having formed therein an internal thread adapted of be fitted with the external thread of the mouth-neck portion of the container, the inner surface of the pilfer-proof bottom portion having formed therein at least one flap extending therefrom radially inwardly, said flap being able to pass over the annular flange of the container by being elastically bent when mounting the closure on the mouth-neck portion of the container, and when the closure has been fully fitted with the mouth-neck portion of the container, the flap which has passed over the annular flange returning elastically to its original state and its upper edge engaging the lower surface of the annular flange.
2. The closure of claim 1 wherein the flap extends axially upwardly from its lower edge connected to the inner surface of the pilfer-proof bottom portion.
3. The closure of claim 1 wherein the flap extends from its one side edge connected to the inner surface of the pilfer-proof bottom portion in a direction opposite to the rotating direction of the closure when mounting it on the mouth-neck portion.
4. The closure of any one of claims 1 to 3 wherein the flap is rectangular and its lower edge or one side edge is connected to the inner surface of the pilfer-proof bottom portion.
5. The closure of claim 3 wherein the upper edge of the flap extends substantially horizontally, but its lower edge is inclined upwardly toward its free edge from its one side edge connected to the inner surface of the pilfer-proof bottom portion, and the width of the flap decreases progressively toward its free end edge.
6. The closure of claim 1 wherein the flap extends at an angle of about 5 to about 45 degrees with respect to the inner surface of the pilfer-proof bottom portion.
7. The closure of claim 1 wherein the flap has a thickness of about 0.5 to about 3 mm.
8. The closure of claim 1 wherein the flap increases pro-gressively in thickness from its lower edge to its upper edge, and the thickness of its upper edge is about 0.5 to about 3 mm.
9. The closure of claim 1 wherein a sealing member made of a plastic material having different properties from a plastic material of which the main body of the closure including the top panel wall and the skirt wall is made is disposed on the inner surface of the top panel wall, and the inner surface of the main body of the closure and a surface of the sealing member have formed therein respectively rotation-preventing engaging portions which are engaged with each other to prevent the relative rotation of the main body of the closure and the sealing member.
10. The closure of claim 9 wherein the rotation-preventing engaging portions are comprised of a plurality of raised portions circumferentially spaced in a boundary area between the peripheral edge of the inner surface of the top panel wall of the main body of the closure and the upper end of the inner surface of the skirt wall, and a plurality of depressed portions spaced circumferen-tially in a boundary area between the peripheral edge of the upper surface of the sealing member and the upper end of its peripheral side surface.
11. The closure of claim 9 wherein a projection is formed centrally in the inner wall of the top panel wall and a depression engaging said projection is formed centrally in the sealing member, and the rotation-preventing engaging portions are comprised of a plurality of raised portions spaced circumferentially on the circumferential side surface of said projection and a plurality of depressed portions spaced circumferentially on the inner surface of said depression.
12. The closure of claim 9 wherein a projection is formed centrally in the inner wall of the top panel wall and a depression engaging said projection is formed centrally in the sealing member, and the rotation-preventing engaging portions are comprised of a plurality of depressed portions spaced circumferentially on the circumferential side surface of said projection and a plurality of raised portions spaced circumferentially on the inner surface of said depression.
13. The closure of claim 9 wherein said rotation-preventing engaging portions are comprised of a projection having a polygonal cross section formed centrally on the inner surface of the top panel wall of the main body of the closure and a depression having a polygonal cross section formed centrally in the sealing member and engaging said projection.
14. The closure of claim 9 wherein said rotation-preventing engaging portions are comprised of a plurality of depressed por-tions circumferentially spaced in a boundary area between the peripheral edge of the inner surface of the top panel wall of the main body of the closure and the upper end of the inner sur-face of the skirt wall, and a plurality of raised portions spaced circumferentially in a boundary area between the peripheral edge of the upper surface of the sealing member and the upper end of its circumferentially side surface.
15. The closure of claim 9 wherein a depression is formed centrally in the inner wall of the top panel wall and a projection engaging said depression is formed centrally in the sealing member, and the rotation-preventing engaging portions are comprised of a plurality of raised portions spaced circumferentially on the circumferential side surface of said depression and a plurality of depressed portions spaced circumferentially on the inner sur-face of said projection.
16. The closure of claim 9 wherein a depression is formed centrally in the inner wall of the top panel wall and a projection engaging said depression is formed centrally in the sealing mem-ber, and the rotation-preventing engaging portions are comprised of a plurality of depressed portions spaced circumferentially on the circumferential side surface of said depression and a plur-ality of raised portions spaced circumferentially on the inner surfaces of said projection.
17. The closure of claim 9 wherein said rotation-preventing engaging portions are comprised of a depression having a polygonal cross section formed centrally on the inner surface of the top panel wall of the main body of the closure and a projection hav-ing a polygonal cross section formed centrally in the sealing member and engaging said depression.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35209/82 | 1982-03-15 | ||
| JP1982035209U JPS58139462U (en) | 1982-03-15 | 1982-03-15 | Synthetic resin container lid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1181720A true CA1181720A (en) | 1985-01-29 |
Family
ID=12435451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000403727A Expired CA1181720A (en) | 1982-03-15 | 1982-05-26 | Plastic closure for containers |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4488655A (en) |
| JP (1) | JPS58139462U (en) |
| CA (1) | CA1181720A (en) |
Families Citing this family (33)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4592475A (en) * | 1982-12-06 | 1986-06-03 | Charles N. Hannon | Plastic closure with mechanical pilfer-proof |
| US4694969A (en) * | 1983-11-17 | 1987-09-22 | Aci Australia Limited | Container closure |
| US4588100A (en) * | 1984-01-18 | 1986-05-13 | Japan Crown Cork Co., Ltd. | Pilfer-proof plastic closure for containers |
| IT1173373B (en) * | 1984-02-24 | 1987-06-24 | Guala Angelo Spa | CLOSURE FOR BOTTLES |
| US4592476A (en) * | 1984-06-19 | 1986-06-03 | Japan Crown Cork Co., Ltd. | Combination of a container and a closure |
| US4550844A (en) * | 1984-06-22 | 1985-11-05 | Owens-Illinois, Inc. | Tamper resistant closure with tear-off band |
| DE3446652A1 (en) * | 1984-12-20 | 1986-06-26 | Thermoplast & Apparatebau Gmbh, 6270 Idstein | Screw closure with safeguard against misuse |
| EP0229206A1 (en) * | 1986-01-13 | 1987-07-22 | Ewit S.A. | Container closure with a tamper-indicating band |
| IT1191796B (en) * | 1986-05-30 | 1988-03-23 | Guala Angelo Spa | WARRANTY CLOSURE, FOR BOTTLES OF SPIRITS AND SIMILAR |
| ATE86202T1 (en) * | 1986-06-02 | 1993-03-15 | Vallender Leonard J | PLASTIC CLOSURE WITH MECHANICAL SECURITY. |
| CH672109A5 (en) * | 1987-01-30 | 1989-10-31 | Wiedmer Plastikform W | |
| JPH0716630Y2 (en) * | 1987-10-05 | 1995-04-19 | 株式会社柴崎製作所 | Aseptic filling resin cap |
| US4846361A (en) * | 1988-08-01 | 1989-07-11 | Owens-Illinois Closure Inc. | Tamper-indicating closure for a container and improved capping without top loading |
| US4863050A (en) * | 1988-09-16 | 1989-09-05 | Owens-Illinois Closure Inc. | Tamper indicating package and molded plastic threaded closure therefor |
| US4938371A (en) * | 1989-05-19 | 1990-07-03 | Continental White Cap, Inc. | Closure having improved sealant channel for receiving sealant by spin lining |
| JP2525040Y2 (en) * | 1989-07-18 | 1997-02-05 | 株式会社 柴崎製作所 | Synthetic resin cap with hidden display |
| US4971212A (en) * | 1989-10-06 | 1990-11-20 | Owens-Illinois Closure Inc. | Tamper indicating packages |
| DE4201997C1 (en) * | 1992-01-25 | 1992-12-10 | Stella Kunststofftechnik Gmbh, 6228 Eltville, De | |
| DE4214151C2 (en) * | 1992-04-29 | 1995-11-09 | Alcoa Gmbh Verpackwerke | Container closure |
| CA2101196C (en) * | 1992-07-28 | 2005-06-14 | James L. Gregory | Plastic beverage closure |
| US5265747A (en) * | 1992-07-28 | 1993-11-30 | Owens-Illinois Closure Inc. | Plastic beverage closure |
| US5356019A (en) * | 1992-10-14 | 1994-10-18 | Crown Cork & Seal Company, Inc. | Tamper indicating plastic closure |
| US5957315A (en) * | 1996-12-17 | 1999-09-28 | Japan Crown Cork Co., Ltd. | Plastic container closure with tamper evident properties |
| US5979682A (en) * | 1997-04-14 | 1999-11-09 | Zumbuhl; Bruno | Tab construction for closures having tamper evident rings |
| US6123122A (en) * | 1998-10-20 | 2000-09-26 | Abel Unlimited, Inc. | Hygenic bottle cap and liquid dispensing system |
| US6408904B1 (en) | 1998-10-20 | 2002-06-25 | Abel Unlimited, Inc. | Hygienic bottle cap |
| US6491175B1 (en) | 2000-06-28 | 2002-12-10 | Saad Taha | Single piece closure for a pressurized container |
| US20040188375A1 (en) * | 2002-07-03 | 2004-09-30 | Fabricas Monterrey, S.A. De C.V. | Linerless plastic closure with a sealing lip |
| US7014060B2 (en) | 2002-07-19 | 2006-03-21 | Ball Corporation | Twist opening sealing container |
| US8245752B2 (en) * | 2008-03-19 | 2012-08-21 | Nordson Corporation | Apparatus and methods for dispensing adhesive to labels |
| US10889048B2 (en) * | 2009-10-15 | 2021-01-12 | Ring Container Technologies, Llc | Tamper evident closure for container |
| US10244922B2 (en) * | 2013-09-03 | 2019-04-02 | Truphatek International Ltd. | Single use laryngoscope handle for use in dual component laryngoscope assembly |
| FR3050143A1 (en) * | 2016-04-19 | 2017-10-20 | Valeo Systemes Thermiques | PLASTIC COMPONENT FOR HEATING, VENTILATION OR AIR CONDITIONING DEVICE |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1054308A (en) * | ||||
| US1910913A (en) * | 1931-05-12 | 1933-05-23 | Colt S Mfg Co | Container closure |
| US2068389A (en) * | 1931-09-21 | 1937-01-19 | Anchor Cap & Closure Corp | Closure cap and liner therefor |
| US3189209A (en) * | 1963-05-21 | 1965-06-15 | Thatcher Glass Mfg Company Inc | Closure for containers |
| JPS4416633Y1 (en) * | 1965-07-07 | 1969-07-18 | ||
| FR2228005B2 (en) * | 1973-05-02 | 1977-09-02 | Cros Modesto | |
| JPS5026659U (en) * | 1973-06-30 | 1975-03-27 | ||
| US4153174A (en) * | 1975-11-17 | 1979-05-08 | The Klm Company | Tamper-proof closure |
| AU516094B2 (en) * | 1977-12-14 | 1981-05-14 | Metal Closures Group Limited | Closures for containers |
| EP0008190A1 (en) * | 1978-08-03 | 1980-02-20 | Plysu Limited | Pilferproof closure |
| JPS5832105B2 (en) * | 1979-11-10 | 1983-07-11 | 日本クラウンコルク株式会社 | Synthetic resin container lid with pill-proof properties |
| US4331249A (en) * | 1981-03-10 | 1982-05-25 | The Continental Group, Inc. | Plastic closure member with flowed-in liner |
| US4418828A (en) * | 1981-07-24 | 1983-12-06 | H-C Industries, Inc. | Plastic closure with mechanical pilfer band |
-
1982
- 1982-03-15 JP JP1982035209U patent/JPS58139462U/en active Pending
- 1982-05-25 US US06/382,053 patent/US4488655A/en not_active Expired - Lifetime
- 1982-05-26 CA CA000403727A patent/CA1181720A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58139462U (en) | 1983-09-20 |
| US4488655A (en) | 1984-12-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |