Tamper-Resistant Storage Container
The present invention is directed to a tamper-resistant storage container. The storage container includes a container and lid portion having formed channels and surfaces along their perimeters configured to interlock securely to each other to attach the lid to the container. The lid includes at least one open area spanned by a breakaway stringer defining an area of weakness along a perimeter of the lid such that removing or attempting to remove the lid from the container breaks the stringer to provide a visible indication that the container has been opened or tampered with.
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENTNot applicable.
BACKGROUND OF THE INVENTIONThe present invention relates generally to storage containers, and more particularly to sealable storage containers having a tamper-resistant feature to indicate if the container has been opened since its original sealing.
DESCRIPTION OF RELATED ARTStorage containers are commonly used for the storage and distribution of numerous products, including food products. For example, grocery stores offer various pre-packaged food in storage containers having a receptacle portion covered by a lid that fits over the open top of the receptacle. Grocery stores and other food merchants also offer freshly prepared and ready to eat foods, placing those foods into storage containers for transport by the consumer. Merchants and consumers are concerned with the safety of their food products, particularly in the case of food that has been packaged into storage containers and placed into areas accessible by the general public, such as in refrigerated display chests in a delicatessen or grocery store. Because those packaged foods are accessible to the general public there is concern that the storage containers may be opened either accidentally or intentionally, resulting in potential contamination or spoilage of the food product within the container.
Various methods of sealing storage containers are known in the art, but those known methods have numerous drawbacks. For example, storage containers are often wrapped with a cellophane band, ostensibly affixing the lid to the receptacle portion of the container such that the cellophane band must be broken or removed to open the container so that an un-banded container may indicate that the container has been opened since its original sealing. This type of indicator is deficient, however, in that the consumer must first be aware that a cellophane band should even be present. In addition, because food storage containers are typically made of a resilient, deflectable material, it is possible to remove and replace the cellophane bands onto the containers without breaking or tearing them. Thus, sealing methods such as a cellophane band do not provide a positive indicator of potential tampering with the container and/or food product as is desired by merchants and consumers.
Other types of tamper resistant features have also been developed, such as a security seal hindering access to the lid of a storage container. This type of security feature typically includes a break-away seal that must be removed in order to access and remove the lid from the container. While generally effective, this additional seal method of securing a container requires that one or more additional parts be manufactured and installed on the container, thus increasing the container cost and the labor cost to assemble the container with the seal.
SUMMARY OF THE INVENTIONThe present invention is directed to a tamper-resistant storage container comprising a container having an open top for receiving and storing contents, with a lid configured to mate securely with the container to seal the contents therein. The lid includes formed channels extending around its outer perimeter, those channels and surfaces conform to and mate with similarly shaped channels and surfaces formed on the upper perimeter of the container. The engagement between the channels and surfaces on the lid and container provide a seal between the two. In addition, a protruding lip on the upper perimeter of the container overlaps a setback portion of the lid to provide an interference fit so that removal of the lid is very difficult without severely deforming the container and/or lid.
The lid includes one or more tamper-resistant features, including open areas positioned along the perimeter, the open areas spanned by a relatively narrow stringer to provide one or more areas of weakness around the lid's perimeter. The stringers allow a portion of the lid to be broken away to relieve the interference fit between the lid and container at that area, thus allowing easy removal of the lid, with the broken stringers providing a visual indication that the lid has been removed since the original sealing of the container. Because the lid fits so tightly to the container the force of removing or attempting to remove the lid from the container breaks the stringer to provide a visual indication that the container has been opened or potentially tampered with since its original sealing.
Other variations and exemplary embodiments are also presented.
The present invention is directed to a tamper-resistant container that provides a visible physical indication if the container has been opened after its initial, original sealing. While the invention will be described in detail below with reference to several exemplary embodiments, it should be understood that the invention is not limited to the specific configurations of these embodiments. For example, although the tamper-resistant container is described primarily in the context of consumer-sized food containers, the invention could equally be used in connection with various other types of containers, such as containers for liquids or solids, or containers of other sizes. And, while the container in the figures is generally square in shape, the invention may equally be implemented in containers of other shapes, such as rectangular or round containers. In addition, although the exemplary embodiments are described as embodying numerous features, one skilled in the art will appreciate that the various features may be present in various combinations in various embodiments of the invention.
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Lid 14 is sized and shaped to cover the open top of container 12, with a generally flat upper surface 26 extending to a perimeter 28 that is configured generally to the shape of the upper perimeter 24 of the container. As will be described in more detail herein below, lid 14 and container 12 each include similar interlocking channels and surfaces around their perimeters such that the outer perimeter of the lid is tightly engaged to the upper perimeter of the container so that the lid cannot be removed from the container without deforming the lid or container material (providing evidence of tampering), or without breaking a tamper-resistant security feature on the lid as will be described in more detail herein below.
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Container 12 and lid 14 are preferably formed of plastic, using a thermoform process wherein the raw plastic material is heated to approximately 250 to 300 degrees Fahrenheit and formed onto a mold using vacuum and air pressure. Most preferably, container 12 and lid 14 are formed of a transparent plastic having properties such that deformation or stress of the formed container or lid results in hazing, crazing, fogging, whitening, or other discoloration of the plastic material. Of course, other materials known in the art may be used for the lid and container, or the lid and container may be manufactured from dissimilar materials. These and other variations are within the scope of the present invention.
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The interlocking channels and surfaces of the outer perimeter of the lid 14 and upper perimeter of the container 12 as just described provide a tight seal between the lid and container to securely engage the lid to the container. In addition, as just described with respect to the corner portion of the container, sharp step 58 of the lid undercuts the protruding lip 46 of the container to provide an interference between the two such that lid 14 may not be removed from the container 12 without deforming the container or without breaking the tamper-resistant stringer as previously described.
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As just described, the configuration of the side wall portions of container 12 and lid 14 are substantially similar to the corresponding corner wall portions as described previously, with the exception of the steepness of the step 58, 59 in the downwardly extending wall 56 of the outer portion of the lid defining the severity of the overlap with the protruding lip of the container. In the corner wall portion as depicted in
As will be apparent to those skilled in the art, the sharp step 58 of the corner wall portion of the lid extending under the protruding lip 46 of the container as depicted in
As will be further apparent, the relative ease or difficulty in removing the lid 14 from the container 12 may be adjusted by varying the amount of lid perimeter having a sharp step versus the amount of lid perimeter having a gradual step. For example, the exemplary embodiment as just described includes sharp steps (as depicted in
Additionally, the specific placement of a sharp step overlap region and a gradual overlap region along the perimeter likewise affects the force necessary to remove the lid. For example, a sharp step overlap along the straight side of the container would result in a much more difficult removal than that same overlap located at a rounded corner of the container. Finally, the amount of the overlap between the sharp step 58 and the lip 46 may be varied to increase or decrease the engagement force—by varying the length of the sharp step 58 portion of lid 14, the length of the protruding lip 46 portion of the container, or combinations thereof. Preferably, the overlap between sharp step 58 and protruding lip 46 is approximately 3/16 inch to approximately 7/32 inch.
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As described previously, container 12 and lid 14 are preferably formed from a plastic material that hazes, crazes, or otherwise deforms or discolors upon being stressed. Thus, any attempt to open the container by circumventing the tamper-resistant stringer and tab would result in yet another visual indication in the form of crazing to indicate that the container may have been opened or tampered with since its original sealing.
Variations on the embodiments described herein are anticipated by, and within the scope of, the present invention. For example, while the tamper-resistant container in the exemplary embodiment depicted is generally square in shape, the invention described herein may be embodied in a tamper-resistant container of any shape, such as a rectangular, circular, or oval container. Similarly, while the tamper-resistant container depicted herein includes a pair of open areas 30 and stringers 32 defining areas of weakness adjacent a single corner of the container, other numbers and configurations of that arrangement are contemplated by the present invention. For example, a tamper-resistant container may include open areas and stringers adjacent every corner of the container, adjacent only opposite corners of the container, or positioned along a side of the container. Or in the case of circular or oval containers, open spaces and stringers may be positioned symmetrically or asymmetrically around the perimeter of the container. These and other arrangements fall within the scope of the present invention.
The term “substantially”, “approximately” or other modifying term as used herein may be applied to modify any quantitative representation which could permissibly vary without resulting in a change in the basic function to which it is related. For example, lid 14 is described as being substantially flat, but may permissibly vary from that qualification if the variance does not materially alter the capability of the invention.
While the present invention has been described and illustrated hereinabove with reference to an exemplary embodiment, it should be understood that various modifications could be made to this embodiment without departing from the scope of the invention. Therefore, the invention is not to be limited to the specific embodiment described and illustrated hereinabove, except insofar as such limitations are included in the following claims.
Claims
1. A tamper-resistant storage container, comprising:
- a receptacle comprising a bottom with sidewalls extending upwardly to an upper perimeter, said bottom and sidewalls defining an inner cavity for receiving and storing a contents; and
- a lid configured to mate with said receptacle to seal said contents therein, said lid comprising at least one area of weakness positioned along a perimeter of said lid such that said area of weakness will break prior to other portions of said lid when presented with a removal force to said lid.
2. The tamper-resistant storage container of claim 1, wherein said area of weakness comprises at least one open area spanned by a stringer such that said stringer will break when presented with a removal force to said lid.
3. The tamper-resistant storage container of claim 1, comprising two areas of weakness on said lid positioned along corresponding adjacent sidewalls of said receptacle.
4. The tamper-resistant storage container of claim 1, wherein said receptacle is substantially rectangular in shape and wherein said lid comprises at least two areas of weakness positioned on adjacent sidewalls on opposite sides of a corner of said receptacle.
5. The tamper-resistant container of claim 4, wherein said receptacle is substantially square in shape.
6. A tamper-resistant storage container, comprising:
- a receptacle comprising a bottom portion with at least one wall extending upwardly to an upper perimeter, said upper perimeter comprising at least one channel configured to mate with a like-shaped on a lid; and
- a lid comprising an outer perimeter, said outer perimeter comprising at least one channel configured to mate with said channel of said receptacle such that said lid is securely held to said receptacle, wherein said lid comprises at least one area of weakness having a shear strength less than a shear strength of a remainder of said lid.
7. The tamper-resistant storage container of claim 6, wherein said receptacle comprises a protruding lip and wherein said lid comprises a stepped portion extending inwardly under said protruding lip such that said stepped portion engages said protruding lip upon a removal force applied to said lid.
8. The tamper-resistant storage container of claim 7, wherein said stepped portion extends under said protruding lip approximately at least 3/16 inch.
9. The tamper-resistant storage container of claim 6, wherein said area of weakness comprises an open area spanned by a stringer.
10. The tamper-resistant storage container of claim 6, wherein said lid comprises a plurality of areas of weakness positioned around a perimeter of said lid.
11. The tamper-resistant storage container of claim 10, wherein at least two of said areas of weakness are positioned on opposite sides of a corner of said receptacle.
12. The tamper-resistant storage container of claim 6, wherein said receptacle is substantially circular in shape and wherein said at least one wall extends around a perimeter of said bottom.
12. The tamper-resistant storage container of claim 6, wherein at least one of said lid and said receptacle are made of a material having properties such that deformation discolors said material.
13. A tamper-resistant storage container, comprising:
- a receptacle comprising a bottom with at least one sidewall extending upwardly to an upper perimeter, said bottom and sidewall defining an inner cavity for receiving and storing a contents, wherein said upper perimeter comprises at least one channel configured to receive a corresponding protrusion in a lid; and
- a lid configured to mate with said receptacle, said lid comprising an outer perimeter having a protrusion configured to mate with said channel in said receptacle, wherein said lid comprises at least one area of weakness positioned along a perimeter of said lid such that said area of weakness will break prior to other portions of said lid when presented with a removal force to said lid.
14. The tamper-resistant storage container of claim 13, wherein said receptacle comprises a protruding lip and wherein said lid comprises a step extending inwardly under said protruding lip.
15. The tamper-resistant storage container of claim 14, wherein said step extends under said protruding lip approximately at least 3/16 inch.
16. The tamper-resistant storage container of claim 13, wherein said area of weakness comprises an open area spanned by a stringer.
17. The tamper-resistant storage container of claim 13, wherein said lid comprises a plurality of areas of weakness positioned around a perimeter of said lid.
18. The tamper-resistant storage container of claim 17, wherein at least two of said areas of weakness are positioned on opposite sides of a corner of said receptacle.
19. The tamper-resistant storage container of claim 13, comprising a plurality of areas of weakness positioned around said perimeter of said lid.
20. The tamper-resistant storage container of claim 19, wherein said areas of weakness have a shear strength less than a shear strength of areas of said lid not comprising said areas of weakness.
Type: Application
Filed: Aug 7, 2009
Publication Date: Feb 10, 2011
Inventors: Raymond C. Massey, JR. (Omaha, NE), Carl R. Welchert (Omaha, NE)
Application Number: 12/537,407
International Classification: B65D 55/02 (20060101);