Tamper indicator lid for container
A lid for a container of the type having a peripheral lip at an open end, comprising a cover panel for generally covering the open end of the container. A peripheral wall is provided on the periphery of the cover panel. The peripheral wall is adapted to cooperate with the peripheral lip of the container for releasably securing the lid to the container. The peripheral wall has a tamper indicator tab defined by a slit through the peripheral wall, a frangible membrane intersecting the slit, and a protrusion cooperating with the peripheral lip of the container such that the frangible membrane is adapted to break upon removal of the lid from the container. An end of the tamper indicator lid is detached from a remainder of the lid to indicate that the lid has been removed from the container.
1. Field of the Invention
The present invention generally relates to plastic-molded lid and containers and, more particularly, to a lid configuration that indicates tampering/pilfering of the contents of a container associated with the lid.
2. Background Art
Plastic-molded container/lid assemblies represent an advantageous packing solution in some industries. Amongst the advantageous features of plastic-molded container/lid assemblies are the low cost of such assemblies (e.g., relatively low weight of material used), the resilience of the plastic they are made from, the ease of manufacturing such assemblies in various sizes and shapes. Plastic-molded lid/container assemblies are well suited for being used in production lines, due to their resilience, low weight and convenient shapes.
Plastic-molded container/lid assemblies are often used in the food industry, for instance in the packing of fresh foodstuff. These assemblies are conveniently usable on filing lines.
Plastic parts are vulnerable to tampering/pilfering, as they are often provided without any safety system to prevent such mischief. It would therefore be desired to provide a lid for plastic-molded lid/container assemblies configured to indicate marks of tampering, so as to indicate faulty products.
SUMMARY OF INVENTIONIt is an aim of the present invention to provide a novel lid for a plastic-molded lid/container assembly.
It is a further aim of the present invention to provide a lid for a lid/container assembly, having a tamper indicator.
Therefore, in accordance with the present invention, there is provided a lid for a container of the type having a peripheral lip at an open end, comprising a cover panel for generally covering the open end of the container; and a peripheral wall on the periphery of the cover panel, the peripheral wall adapted to cooperate with the peripheral lip of the container for releasably securing the lid to the container, the peripheral wall having a tamper indicator tab defined by at least one slit through the peripheral wall, a frangible membrane intersecting the slit, and a protrusion cooperating with the peripheral lip of the container such that the frangible membrane is adapted to break upon removal of the lid from the container; whereby an end of the tamper indicator lid is detached from a remainder of the lid to indicate that the lid has been removed from the container.
Further in accordance with the present invention, there is provided a container assembly comprising a container having a peripheral lip at an open end; and a lid having a cover panel for generally covering the open end of the container, and a peripheral wall on the periphery of the cover panel, the peripheral wall adapted to cooperate with the peripheral lip of the container for releasably securing the lid to the container, the peripheral wall having a tamper indicator tab defined by at least one slit through the peripheral wall, a frangible membrane intersecting the slit, and a protrusion cooperating with the peripheral lip of the container such that the frangible membrane is adapted to break upon removal of the lid from the container; whereby an end of the tamper indicator lid is detached from a remainder of the lid to indicate that the lid has been removed from the container.
BRIEF DESCRIPTION OF THE DRAWINGSHaving thus generally described the nature of the invention, reference will now be made to the accompanying drawings, showing by way of illustration a preferred embodiment thereof and in which:
Referring concurrently to
The lid 10 is a recessed lid having a cover panel 12 of circular shape. A skirt 14 surrounds the periphery of the cover panel 12, so as to cooperate with the lip B of the container A whereby the lid 10 is held captive on the container A, and in sealing engagement therewith. Although the lid 10 is illustrated having a circular shape, it is pointed out that the lid 10 may also be provided in other shapes: rectangular, square, oval and the like. Moreover, a recess-type lid is illustrated in FIGS. 1 to 6 (e.g., for better leak resistance), but it is contemplated to provide the lid of the present invention in a non-recessed configuration.
Referring to
More specifically, the outer wall 21 has an undercut 24 (i.e., or protrusion) in the annular cavity 23. The undercut 24 cooperates with the lip B of the container A, such that the lid 10 is held captive onto the container A. A sealing abutment 29 projects from the shoulder 22 into the annular cavity 23, and will abut against the lip B when the lid 10 is secured to the container A.
As shown in
As shown concurrently in
The section view of
The membranes 27 each consist of a channel formed in the outer wall 21, resulting in a thinner strip of material. The membranes 27 each extend from a bottom edge of the outer wall 21 to an intersection with the slits 25, thereby defining the breaking tabs 26.
Therefore, the breaking tabs 26 define weaker portions of the outer wall 21, i.e., more likely to rupture due to the breakable connection between the breaking tabs 26 and the lift tabs 28. Accordingly, if the lip B of the container A exerts a pressure of the lower portion 24B of the undercut 24 as illustrated in
Referring to
In this position, the lip B is lodged in the annular cavity 23 defined by the skirt 14, and has its free end C held captive by the undercut 24. More specifically, as illustrated in
Referring to
As illustrated in
As illustrated in
The lid 10 of the present invention may be advantageously molded in a single cycle, with a suitable polymeric material [e.g., polypropylene, polyethylene (LLDPE), polystyrene, and the like], to lower production costs. Alternatively, the lid 10 of the present invention may be subjected to a post-trimming step, wherein the horizontal slits 25 are cut according to the above-described configuration after the molding step. Various types of molding could be used to produce the lid 10 of the present invention, such as injection molding (e.g., thin-wall injection molding), thermoforming. The lid 10 may be printed, for instance, with conventional offset printing equipment. The lid 10 is configured so as to allow lid-to-lid stacking, for instance, using spin-bar or screw-type stacking equipment.
It is within the ambit of the present invention to cover any obvious modifications of the embodiments described herein, provided such modifications fall within the scope of the appended claims.
Claims
1. A lid for a container of the type having a peripheral lip at an open end, comprising:
- a cover panel for generally covering the open end of the container; and
- a peripheral wall on the periphery of the cover panel, the peripheral wall adapted to cooperate with the peripheral lip of the container for releasably securing the lid to the container, the peripheral wall having a tamper indicator tab defined by at least one slit through the peripheral wall, a frangible membrane intersecting the slit, and a protrusion cooperating with the peripheral lip of the container such that the frangible membrane is adapted to break upon removal of the lid from the container;
- whereby an end of the tamper indicator lid is detached from a remainder of the lid to indicate that the lid has been removed from the container.
2. The lid according to claim 1, wherein the slit is generally parallel to a bottom edge of the peripheral wall.
3. The lid according to claim 2, wherein the frangible membrane is generally perpendicular to the slit.
4. The lid according to claim 2, comprising two of said frangible membrane for each of the at least one slit, the frangible membranes being positioned at opposed ends of the at least one slit.
5. The lid according to claim 1, wherein the peripheral wall is an outer wall of a skirt surrounding the cover panel.
6. The lid according to claim 5, wherein the skirt defines an inner cavity adapted to accommodate the peripheral lip of the container when the lid is mounted to the container, an abutment being provided in the cavity and adapted to sealingly abut against the peripheral lip.
7. The lid according to claim 1, wherein the peripheral wall has an undercut adapted to support the peripheral lip of the container such that the lid is releasably secured to the container.
8. The lid according to claim 7, wherein the undercut is separated by the at least one slit to define said protrusion at a lower portion of the peripheral wall, and an upper portion adapted to cooperate with the peripheral lip of the container when the lid is secured to the container.
9. The lid according to claim 1, wherein the lid is integrally molded in a polymeric material.
10. The lid according to claim 1, comprising at least two of the tamper indicator tab, the at least two tamper indicator tabs being separated by pull tabs formed in the peripheral wall.
11. A container assembly comprising:
- a container having a peripheral lip at an open end; and
- a lid having a cover panel for generally covering the open end of the container, and a peripheral wall on the periphery of the cover panel, the peripheral wall adapted to cooperate with the peripheral lip of the container for releasably securing the lid to the container, the peripheral wall having a tamper indicator tab defined by at least one slit through the peripheral wall, a frangible membrane intersecting the slit, and a protrusion cooperating with the peripheral lip of the container such that the frangible membrane is adapted to break upon removal of the lid from the container;
- whereby an end of the tamper indicator lid is detached from a remainder of the lid to indicate that the lid has been removed from the container.
12. The container assembly according to claim 11, wherein the slit is generally parallel to a bottom edge of the peripheral wall.
13. The container assembly according to claim 12, wherein the frangible membrane is generally perpendicular to the slit.
14. The container assembly according to claim 12, comprising two of said frangible membrane for each of the at least one slit, the frangible membranes being positioned at opposed ends of the at least one slit.
15. The container assembly according to claim 11, wherein the peripheral wall is an outer wall of a skirt surrounding the cover panel.
16. The container assembly according to claim 15, wherein the skirt defines an inner cavity adapted to accommodate the peripheral lip of the container when the lid is mounted to the container, an abutment being provided in the cavity and adapted to sealingly abut against the peripheral lip.
17. The container assembly according to claim 11, wherein the peripheral wall has an undercut adapted to support the peripheral lip of the container such that the lid is releasably secured to the container.
18. The container assembly according to claim 17, wherein the undercut is separated by the at least one slit to define said protrusion at a lower portion of the peripheral wall, and an upper portion adapted to cooperate with the peripheral lip of the container when the lid is secured to the container.
19. The container assembly according to claim 11, comprising at least two of the tamper indicator tab, the at least two tamper indicator tabs being separated by pull tabs formed in the peripheral wall.
Type: Application
Filed: Jul 16, 2004
Publication Date: Jan 19, 2006
Inventor: David Caille (Sherbrooke)
Application Number: 10/892,126
International Classification: B65D 17/34 (20060101);