CA1284630C - Tamper-proof closure for containers - Google Patents
Tamper-proof closure for containersInfo
- Publication number
- CA1284630C CA1284630C CA000500451A CA500451A CA1284630C CA 1284630 C CA1284630 C CA 1284630C CA 000500451 A CA000500451 A CA 000500451A CA 500451 A CA500451 A CA 500451A CA 1284630 C CA1284630 C CA 1284630C
- Authority
- CA
- Canada
- Prior art keywords
- annular
- depending
- flange
- annular flange
- closure
- 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 - Lifetime
Links
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- Closures For Containers (AREA)
Abstract
ABSTRACT
An improved resilient molded plastic closure for a container comprising a part for covering an opening in said container; a first depending annular flange having a lower edge on said part oppositely disposed outturned and inturned annular flanges on said lower edge of said first depending annular flange, a second depending annular flange of a larger diameter than said first depending annular flange positioned on said outturned annular flange, the inturned flange forming a first fastener and an annular groove in said second depending annular flange forming a second fastener, an annular frangible wall formed in said second depending annular flange adjacent and below said outturned annular flange, a score line formed in said second depending annular flange and extending from said lower edge thereof to said annular frangible wall to define a tear skirt portion, said tear skirt portion having a pull tab affixed thereto, the oppositely disposed outturned and inturned annular flanges on the lower edge of said first depending annular flange forming an annular shoulder outwardly of said container enabling the asme to be readily manually engaged for removing the closure.
An improved resilient molded plastic closure for a container comprising a part for covering an opening in said container; a first depending annular flange having a lower edge on said part oppositely disposed outturned and inturned annular flanges on said lower edge of said first depending annular flange, a second depending annular flange of a larger diameter than said first depending annular flange positioned on said outturned annular flange, the inturned flange forming a first fastener and an annular groove in said second depending annular flange forming a second fastener, an annular frangible wall formed in said second depending annular flange adjacent and below said outturned annular flange, a score line formed in said second depending annular flange and extending from said lower edge thereof to said annular frangible wall to define a tear skirt portion, said tear skirt portion having a pull tab affixed thereto, the oppositely disposed outturned and inturned annular flanges on the lower edge of said first depending annular flange forming an annular shoulder outwardly of said container enabling the asme to be readily manually engaged for removing the closure.
Description
4~j3(~
TAMI'ER-P~OOF CLOSURE FO~ CONTAINERS
_ack~ro nd of th QInvention Tecllnical__ield:
This invention relates to tamper-proof closures for containers, such as blow molded plastic jugs which are widely used in the dairy industry for the expendible packaging of dairy products, such as milk.
Description of the Prior Art:
Prior closures of this type may be seen in United States Patents 3,893,583 of July 8, 1975 to McLaren, 4,037,746 of July 26, 1977 to Verllage, 4,066,182 of January 3, 1978 to Allen, et al., and 4,202,455 of May 13, 1980 to Faulstich.
The present invention provices a novel dual fastening of a molded plastic tamper-proof closure in that -the closure includes a top portion with a depending annular flange having a first fastening configuration therin with a second fastening configuration formed in a tear skirt depending from the annular depending flange of the cap portion of the closure.
Summarv of the Invention ~!34~j3~) A tamper-proof closure for containers, such as blow molded jugs with appropriate neck configurations, takes the form of a cap portion having a top and annular depending flange on its peripheral edge radiaily spaced with respect to an annular sealing flange. An inturned fastening flange is formed on the inner surface of the annular depen~ing ~lange of the cap portion adjacent an area of larger diameter in which a first annular groove is formed in the inner surface thereof so as to define a thin, frangible connection with the remaining portion of the depending annular flange which forms a tear skirt.
A second annular groove is formed in the tear skirt and forms a secon~ fas-tening configuration. A pull tab is integrally formed with the tear skirt and a diagonal groove is formed in the tear skirt adjacent the pull tab leading from the peripheral edge of tlle tear skirt to the first annular groove and the thin frangible connection defined thereby.
If desired, a plurality of angularly disposed ribs may be formed on the inner surface of the tear skirt for regisl:ry with similar ribs formed on the neck portion of a conta,,rler i.l' an alternate twis',,-ofE separation feature is desirecl.
~scri~tion of_the Dr. win~s Figure 1 i.s a vertical section of the ta~per-proof closure;
Figure 2 ls a vertical section through a portion of the tamper-proof closure and a portion of æ neck of a con-tainer on which the closure is applied showing the dual fa.stening means;
Figure 3 .'.s a vertical section through a portion of the tamper-proof cl,osure after the tear skirt has been removecl and showing the same on a portion of the neck of a container in sealing relation;
Figure 4 is a top plan view of the tamper-proof closure showing the pull tab; and Figure 5 is a side elevation of the tamper-proof closure showing the pull tab and a diagonal tear groove in the tear skirt.
Descri~tion of the Preferred Embodiment By referring to the drawings and Figures 4 and 5 in particular, a top plan view of a side elevation ~4~ 3 of the tamper-proof closure may be seen, the closure including a top portion 10 with a depending annular flange of different cliameters, one of which forms a relatively short first portion 11 and the other forms a larger diameter portion of the depending annular flange 12, thé lower edge of which has an outturned angular flange 13 fomed on a majority of its annular lower edge. A pull tab 14 is attached to the depending annular flange 12 in the area between the ends of the outturned angular flange 13. As illustrated in Figure 5 of the drawings, the portion 12 of the depending annular flange which is of a larger diameter than the portion 11 is provided with a tear groove 115, the lower portion of which extends substantially vertically alongside the end of the pull tab 14 and the upper portion of which runs at an angle with respect thereto upwardly to an annular groove in the depending annular flange 12 and just below the point of enlargement thereof with respect to the first portion 11 of the depending flange.
By referring to Figure 1 of the drawings, an enlarged 1~463U
vertical section of the tamper-proof closure may be seen -to comprise the circular, relatively flat top por-tion 10, the relatively short first portion 11 o-f the annular flange 12 which depends from the peripheral edge of the top portion 10 -together with the outturned angular flange 13 and it will be observed that there is an annular sealing flange 15 which is tapered in thickness that depends from the circular, relatively flat top portion 10 radially spaced inwardly from the first portion 11 of the depending flange 12. The first portion 11 of the depending flange will be observed to be of smaller diameter than the remainder of the depending annular flange 12 and that it is provided with an inturned flange 16 which forms a -first fastening flange. An outturned flange or shoulder 17 defines the difference in diameters of the first portion 11 and the remainder of the depending annular flange 12 and the inturned annular fastening flange 16 is oppositely disposed with respect to the outturned flange 17. The exterior annular suface of the depending annular flange 12 below the outturned flange 17 is formed on a substantially vertical plane and of an increased wall ~hicknes~ with : respect to the wall thlckn~ss of ~he ~irst portion 11 ancl the circular, relative:Ly f:Lat top portlon 10 o~ -~h~
-tamper-proo:E ~o~ure.
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annular flange lZ just below the outturned flange 17, the annular groove 13 being suf~iciently deep thak it ; creatss a thin, frangible connecting wall 1~ and thereby ; defines the te~r skirt which comprises all of the depending annular flange 12 below the annular groove 18. There is a second annular groove 20 in the depending annular flange 12 which forms a second fastening configuration.
By referring now -to Figure 2 Oe the drawings, a portion of a containcr:C having a neck N may be sesn, the configura-ti.on of the:neck N having an inturned tapered top flange 21, . ~ : 15 an annular ~lat shallow groove ~22 on the exterior thereof' and spaced downwardly with respect to the upper end of the ~; : neck portion::o-f the container, an annular :flat wall section 23 immediateIy therebelow, the lower portion of which joins , an outwardly:angling section 24 which extsncls into an annular : 20 rib 25. Ths annular::rib 25 and the flat shallow groove 22 ,: : :
: ~ ::: :
8- ~
. ~ : :: :
.
::
:
. :
" - ~- . .
~4~
o:l the necls portion of -the contai~er form two fastening con:figurations which register with the second annular groove 20 and the inturned fastening f]ange 16 respectively of the cl~sure. It will be seen that simply pushing the closure downwardly on the neck N of the container C brings the dual fastening configurations just described i.nto interlocking relation thus securely positioning the closure on the container neck. ~t tlle same time, the annular sealing flange 15 on the closure regis-ters with the central opening defined by the tapered top flange 21 of the neck N of the container.
By referring now to Figure 3 of the drawings, a vertical section of a portion of the container C and neck N thereof may be seen with the upper portion of the tamper-prooI closure positioned th.ereon in sealing relation.
In Figure.3 of the drawings, the majority of the depending Ilange 12 has been removed leaving the circular, relatively flat top 10 with the first portion 11 of the depending annular flange thereon including the outturned flange 1'7 and the inturned fastening flange 16, which is illustrated in engagement with the upper portion of the flat, shallow _g_ 4~
groove 22 of the neck portion, the engagement of the -tapered annular sea1ing flange 15 with the inner peripheral edge of the -tapered inwardly extending top flange 21 of the neck portion 15 ~eing maintained. The engagement of the inturned fastenlng flange 16 of the closure with the upper portion of the flat shallow groove 22 of the neck portion N
is sufficient to hold the closure as shown in Figure 3 on the container at all times including dropping a container of a one-gallon si~e filled with liquid, such as milk, on a hard surface, such as a floor, from an elevated height.
The proximi-ty of the fastening configuration thus defined to the tapered annular sealing flange 15 limits the distortion of the closure and thus insures a liquid tight seal which is so highly desirable when the closure in its abbreviated form is replaced on the container.
It will be seen that when the tamper-proof closure disclosed herein is positioned downwardly on the neck of a container such as a blow molded plastic jug, the dual fastening configurations snap into position simultaneously and without interfering with one another. As the cap is 1~4~31~
moved downward]y over the neck N of the container, the major portion of the annu].ar dependi.ng flange 12 is spaced out-wardly or radially of the flat shallow groove 22 and the annular flat wa]] 23 of the neck portion N so that they do not engage the same, but move downwardly freely until the annular groove 20, which comprises the second fastening configuration, registers with the annular rib 25 of the neck portion N of the container. Simultaneously, the upper portion of the closure has moved downwardly un-til the inturned annular fastening -flange 16 snaps inunder -the portion of the neck N defining the upper part of the flat shallow groove 22. The additional material and increased wall thickness o-f the closure beneath the outturned flange 17 and substantially opposite the inturned annular fastening flange 16 insures the effective and tight snap-in arrange-ment of the inturned annular fastening flange 16 in the upper portion of the flat shallow groove 22 of the neck portion N. The closure is formed of resilient molded plastic material.
It will occur to those skilled in the art that in order to remove the closure from the neck of the container, it is 4~
necessary to grasp the pul.]. tab 14 as shown in Figure 4 of tlle drawings and move it f:rom left to right wbich causes the lower portion of the depending annular -flange 12 of the closure whi.ch forms the tear skir-t to separate on the line of the groove l8 which is formed in the inner surface of the dependirlg flange 12 as hereinbefore described, continued movement o-f the pull tab 14 from left to right as seen in Figure 4 of the drawings and thence circumferentially of the closure on the neck portion of the container causes the tear skirt, which is the lower portion of the depending annular flange 12, to separate the connec-ting wall 19 where i-t is defined by the first annular groove 18 in the inner wall of the closure. The depending annular flange 12 below the first annular groove 18 is thus removed compl.etely from the closure leaving the remaining portion of the closure as seen in Figure 3, complete with its first -fastening means intact upon the neck N of the container. The provision of the outturned flange 17 and the increased diameter of the annular depending flange 12 forms a convenient annular shoulder therebeneath which tapers upwardly and inwardly as best 4~j3~) seen in Figure 3 of the drawings which is particulary useful in removing the remaining portion of the closure from -the neck N oL the container as it permits a person's fingers to be positioned thereinunder and the edge of the closure lifted including the necessary distortion oI the closure to free the inturned annular fastening flange 16 of the closure from its seat on the neck of the closure.
By referring again to Figure 1 of the drawings, it will be seen that several circumferentially spaced angularly positioned ribs 26 are illustrated as being formed on the inrler surl`ace of the depending flange 12 of the closure and just below the first annular groove 18 which forms the frangible connec~ting wall 19 therein. These angularly dis-posed ribs 26 have two functions. When the closure is formed with these ribs 26, they serve to space the annular depending flange 12 at circumferentially spaced areas with respect to the annular flat wall 23 of the neck N of the closure and thus prevent distortion of the same with respect thereto.
Secondly, the neck N of the container may be provided with matching rib-like configurations on the annular flat wall ~ J~
23 as d-isclosed herein whereupon the ribs 26 may a.ssist the remova:l of the cl.osure from the neck rl of the container by twisting the closure whiLe simultaneously removing the tear skir-t portion of the annular depending flange 12 thereof.
It wi]l thus be seen -that the tamper-proof closure for contairlers disc]osed herein has several points of novelty with respect to the closures hereto-eore known in the art and in particu]ar those which are primarily adapted eor use on blow mo]ded plastic jugs such as used in the dairy industry :eor the packaging of milk and similar li.quid products.
Ilaving thus disclosed my invention wha-t I claim is:
TAMI'ER-P~OOF CLOSURE FO~ CONTAINERS
_ack~ro nd of th QInvention Tecllnical__ield:
This invention relates to tamper-proof closures for containers, such as blow molded plastic jugs which are widely used in the dairy industry for the expendible packaging of dairy products, such as milk.
Description of the Prior Art:
Prior closures of this type may be seen in United States Patents 3,893,583 of July 8, 1975 to McLaren, 4,037,746 of July 26, 1977 to Verllage, 4,066,182 of January 3, 1978 to Allen, et al., and 4,202,455 of May 13, 1980 to Faulstich.
The present invention provices a novel dual fastening of a molded plastic tamper-proof closure in that -the closure includes a top portion with a depending annular flange having a first fastening configuration therin with a second fastening configuration formed in a tear skirt depending from the annular depending flange of the cap portion of the closure.
Summarv of the Invention ~!34~j3~) A tamper-proof closure for containers, such as blow molded jugs with appropriate neck configurations, takes the form of a cap portion having a top and annular depending flange on its peripheral edge radiaily spaced with respect to an annular sealing flange. An inturned fastening flange is formed on the inner surface of the annular depen~ing ~lange of the cap portion adjacent an area of larger diameter in which a first annular groove is formed in the inner surface thereof so as to define a thin, frangible connection with the remaining portion of the depending annular flange which forms a tear skirt.
A second annular groove is formed in the tear skirt and forms a secon~ fas-tening configuration. A pull tab is integrally formed with the tear skirt and a diagonal groove is formed in the tear skirt adjacent the pull tab leading from the peripheral edge of tlle tear skirt to the first annular groove and the thin frangible connection defined thereby.
If desired, a plurality of angularly disposed ribs may be formed on the inner surface of the tear skirt for regisl:ry with similar ribs formed on the neck portion of a conta,,rler i.l' an alternate twis',,-ofE separation feature is desirecl.
~scri~tion of_the Dr. win~s Figure 1 i.s a vertical section of the ta~per-proof closure;
Figure 2 ls a vertical section through a portion of the tamper-proof closure and a portion of æ neck of a con-tainer on which the closure is applied showing the dual fa.stening means;
Figure 3 .'.s a vertical section through a portion of the tamper-proof cl,osure after the tear skirt has been removecl and showing the same on a portion of the neck of a container in sealing relation;
Figure 4 is a top plan view of the tamper-proof closure showing the pull tab; and Figure 5 is a side elevation of the tamper-proof closure showing the pull tab and a diagonal tear groove in the tear skirt.
Descri~tion of the Preferred Embodiment By referring to the drawings and Figures 4 and 5 in particular, a top plan view of a side elevation ~4~ 3 of the tamper-proof closure may be seen, the closure including a top portion 10 with a depending annular flange of different cliameters, one of which forms a relatively short first portion 11 and the other forms a larger diameter portion of the depending annular flange 12, thé lower edge of which has an outturned angular flange 13 fomed on a majority of its annular lower edge. A pull tab 14 is attached to the depending annular flange 12 in the area between the ends of the outturned angular flange 13. As illustrated in Figure 5 of the drawings, the portion 12 of the depending annular flange which is of a larger diameter than the portion 11 is provided with a tear groove 115, the lower portion of which extends substantially vertically alongside the end of the pull tab 14 and the upper portion of which runs at an angle with respect thereto upwardly to an annular groove in the depending annular flange 12 and just below the point of enlargement thereof with respect to the first portion 11 of the depending flange.
By referring to Figure 1 of the drawings, an enlarged 1~463U
vertical section of the tamper-proof closure may be seen -to comprise the circular, relatively flat top por-tion 10, the relatively short first portion 11 o-f the annular flange 12 which depends from the peripheral edge of the top portion 10 -together with the outturned angular flange 13 and it will be observed that there is an annular sealing flange 15 which is tapered in thickness that depends from the circular, relatively flat top portion 10 radially spaced inwardly from the first portion 11 of the depending flange 12. The first portion 11 of the depending flange will be observed to be of smaller diameter than the remainder of the depending annular flange 12 and that it is provided with an inturned flange 16 which forms a -first fastening flange. An outturned flange or shoulder 17 defines the difference in diameters of the first portion 11 and the remainder of the depending annular flange 12 and the inturned annular fastening flange 16 is oppositely disposed with respect to the outturned flange 17. The exterior annular suface of the depending annular flange 12 below the outturned flange 17 is formed on a substantially vertical plane and of an increased wall ~hicknes~ with : respect to the wall thlckn~ss of ~he ~irst portion 11 ancl the circular, relative:Ly f:Lat top portlon 10 o~ -~h~
-tamper-proo:E ~o~ure.
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annular flange lZ just below the outturned flange 17, the annular groove 13 being suf~iciently deep thak it ; creatss a thin, frangible connecting wall 1~ and thereby ; defines the te~r skirt which comprises all of the depending annular flange 12 below the annular groove 18. There is a second annular groove 20 in the depending annular flange 12 which forms a second fastening configuration.
By referring now -to Figure 2 Oe the drawings, a portion of a containcr:C having a neck N may be sesn, the configura-ti.on of the:neck N having an inturned tapered top flange 21, . ~ : 15 an annular ~lat shallow groove ~22 on the exterior thereof' and spaced downwardly with respect to the upper end of the ~; : neck portion::o-f the container, an annular :flat wall section 23 immediateIy therebelow, the lower portion of which joins , an outwardly:angling section 24 which extsncls into an annular : 20 rib 25. Ths annular::rib 25 and the flat shallow groove 22 ,: : :
: ~ ::: :
8- ~
. ~ : :: :
.
::
:
. :
" - ~- . .
~4~
o:l the necls portion of -the contai~er form two fastening con:figurations which register with the second annular groove 20 and the inturned fastening f]ange 16 respectively of the cl~sure. It will be seen that simply pushing the closure downwardly on the neck N of the container C brings the dual fastening configurations just described i.nto interlocking relation thus securely positioning the closure on the container neck. ~t tlle same time, the annular sealing flange 15 on the closure regis-ters with the central opening defined by the tapered top flange 21 of the neck N of the container.
By referring now to Figure 3 of the drawings, a vertical section of a portion of the container C and neck N thereof may be seen with the upper portion of the tamper-prooI closure positioned th.ereon in sealing relation.
In Figure.3 of the drawings, the majority of the depending Ilange 12 has been removed leaving the circular, relatively flat top 10 with the first portion 11 of the depending annular flange thereon including the outturned flange 1'7 and the inturned fastening flange 16, which is illustrated in engagement with the upper portion of the flat, shallow _g_ 4~
groove 22 of the neck portion, the engagement of the -tapered annular sea1ing flange 15 with the inner peripheral edge of the -tapered inwardly extending top flange 21 of the neck portion 15 ~eing maintained. The engagement of the inturned fastenlng flange 16 of the closure with the upper portion of the flat shallow groove 22 of the neck portion N
is sufficient to hold the closure as shown in Figure 3 on the container at all times including dropping a container of a one-gallon si~e filled with liquid, such as milk, on a hard surface, such as a floor, from an elevated height.
The proximi-ty of the fastening configuration thus defined to the tapered annular sealing flange 15 limits the distortion of the closure and thus insures a liquid tight seal which is so highly desirable when the closure in its abbreviated form is replaced on the container.
It will be seen that when the tamper-proof closure disclosed herein is positioned downwardly on the neck of a container such as a blow molded plastic jug, the dual fastening configurations snap into position simultaneously and without interfering with one another. As the cap is 1~4~31~
moved downward]y over the neck N of the container, the major portion of the annu].ar dependi.ng flange 12 is spaced out-wardly or radially of the flat shallow groove 22 and the annular flat wa]] 23 of the neck portion N so that they do not engage the same, but move downwardly freely until the annular groove 20, which comprises the second fastening configuration, registers with the annular rib 25 of the neck portion N of the container. Simultaneously, the upper portion of the closure has moved downwardly un-til the inturned annular fastening -flange 16 snaps inunder -the portion of the neck N defining the upper part of the flat shallow groove 22. The additional material and increased wall thickness o-f the closure beneath the outturned flange 17 and substantially opposite the inturned annular fastening flange 16 insures the effective and tight snap-in arrange-ment of the inturned annular fastening flange 16 in the upper portion of the flat shallow groove 22 of the neck portion N. The closure is formed of resilient molded plastic material.
It will occur to those skilled in the art that in order to remove the closure from the neck of the container, it is 4~
necessary to grasp the pul.]. tab 14 as shown in Figure 4 of tlle drawings and move it f:rom left to right wbich causes the lower portion of the depending annular -flange 12 of the closure whi.ch forms the tear skir-t to separate on the line of the groove l8 which is formed in the inner surface of the dependirlg flange 12 as hereinbefore described, continued movement o-f the pull tab 14 from left to right as seen in Figure 4 of the drawings and thence circumferentially of the closure on the neck portion of the container causes the tear skirt, which is the lower portion of the depending annular flange 12, to separate the connec-ting wall 19 where i-t is defined by the first annular groove 18 in the inner wall of the closure. The depending annular flange 12 below the first annular groove 18 is thus removed compl.etely from the closure leaving the remaining portion of the closure as seen in Figure 3, complete with its first -fastening means intact upon the neck N of the container. The provision of the outturned flange 17 and the increased diameter of the annular depending flange 12 forms a convenient annular shoulder therebeneath which tapers upwardly and inwardly as best 4~j3~) seen in Figure 3 of the drawings which is particulary useful in removing the remaining portion of the closure from -the neck N oL the container as it permits a person's fingers to be positioned thereinunder and the edge of the closure lifted including the necessary distortion oI the closure to free the inturned annular fastening flange 16 of the closure from its seat on the neck of the closure.
By referring again to Figure 1 of the drawings, it will be seen that several circumferentially spaced angularly positioned ribs 26 are illustrated as being formed on the inrler surl`ace of the depending flange 12 of the closure and just below the first annular groove 18 which forms the frangible connec~ting wall 19 therein. These angularly dis-posed ribs 26 have two functions. When the closure is formed with these ribs 26, they serve to space the annular depending flange 12 at circumferentially spaced areas with respect to the annular flat wall 23 of the neck N of the closure and thus prevent distortion of the same with respect thereto.
Secondly, the neck N of the container may be provided with matching rib-like configurations on the annular flat wall ~ J~
23 as d-isclosed herein whereupon the ribs 26 may a.ssist the remova:l of the cl.osure from the neck rl of the container by twisting the closure whiLe simultaneously removing the tear skir-t portion of the annular depending flange 12 thereof.
It wi]l thus be seen -that the tamper-proof closure for contairlers disc]osed herein has several points of novelty with respect to the closures hereto-eore known in the art and in particu]ar those which are primarily adapted eor use on blow mo]ded plastic jugs such as used in the dairy industry :eor the packaging of milk and similar li.quid products.
Ilaving thus disclosed my invention wha-t I claim is:
Claims (3)
1. An improvement in a resilient molded plastic closure for a container of the type having a neck surround-ing an opening to the container and having dual closure retaining means on the exterior of said neck; said closure comprising means for covering said opening to said container;
said improvement comprising a first depending annular flange of a known diameter on said means for covering said opening to said container, said first annular depending flange having a lower edge, oppositely disposed outturned and inturned annular flanges on said lower edge, and a second depending annular flange of a larger diameter than said first depending annular flange on said outturned annular flange, said first and second depending annular flanges surrounding said neck,said inturned flange forming a first means for engaging one of said dual closure retain-ing means, an annular groove in said second depending annular flange forming a second means for engaging the other one of said dual closure retaining means spaced equally between said oppositely disposed outturned and inturned annular flanges and a lower edge of said second depending flange, an annular frangible wall formed in said second depending annular flange adjacent and below said outturned annular flange, a score line formed in said second depending annular flange and extending from said lower edge thereof to said annular frangible wall to define a tear skirt portion, said tear skirt portion having a pull tab affixed thereto, said dual closure retaining means on the exterior of said neck comprising an annular groove positioned for registry with said inturned annular flange and an annular rib positioned for registry with said annular groove in said second depending annular flange whereby the means for covering said opening to said container, the first depending annular flange, and the oppositely disposed outturned and inturned annular flanges on the lower edge of said first depending annular flange form an annular shoulder outwardly of said neck of said container enabling the same to be readily manually engaged for removing the closure.
said improvement comprising a first depending annular flange of a known diameter on said means for covering said opening to said container, said first annular depending flange having a lower edge, oppositely disposed outturned and inturned annular flanges on said lower edge, and a second depending annular flange of a larger diameter than said first depending annular flange on said outturned annular flange, said first and second depending annular flanges surrounding said neck,said inturned flange forming a first means for engaging one of said dual closure retain-ing means, an annular groove in said second depending annular flange forming a second means for engaging the other one of said dual closure retaining means spaced equally between said oppositely disposed outturned and inturned annular flanges and a lower edge of said second depending flange, an annular frangible wall formed in said second depending annular flange adjacent and below said outturned annular flange, a score line formed in said second depending annular flange and extending from said lower edge thereof to said annular frangible wall to define a tear skirt portion, said tear skirt portion having a pull tab affixed thereto, said dual closure retaining means on the exterior of said neck comprising an annular groove positioned for registry with said inturned annular flange and an annular rib positioned for registry with said annular groove in said second depending annular flange whereby the means for covering said opening to said container, the first depending annular flange, and the oppositely disposed outturned and inturned annular flanges on the lower edge of said first depending annular flange form an annular shoulder outwardly of said neck of said container enabling the same to be readily manually engaged for removing the closure.
2. The improvement in a closure for a container set forth in claim 1 and wherein a secondary depending annular flange is formed on said means covering said opening to said container and positioned inwardly of said first mentioned depending annular flange for registry with said neck.
3. The improvement in a closure for a container set forth in claim 1 and wherein said inturned annular flange and said annular groove in said closure are positioned for snap-in registry with said dual closure retaining means on said neck of said container when said closure is moved onto said neck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000500451A CA1284630C (en) | 1986-01-27 | 1986-01-27 | Tamper-proof closure for containers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000500451A CA1284630C (en) | 1986-01-27 | 1986-01-27 | Tamper-proof closure for containers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1284630C true CA1284630C (en) | 1991-06-04 |
Family
ID=4132345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000500451A Expired - Lifetime CA1284630C (en) | 1986-01-27 | 1986-01-27 | Tamper-proof closure for containers |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1284630C (en) |
-
1986
- 1986-01-27 CA CA000500451A patent/CA1284630C/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKEC | Expiry (correction) |
Effective date: 20121205 |