TAMPER EVIDENT FOOD CONTAINER WITH ACCORDIATED PULL TAB

Abstract

A plastic container capable of assuming a loading state, an initially sealed state and an opened state comprises a lid including a lid rim and a base having a base rim. The lid rim sealingly engages with the base rim. A projecting portion has an accordiated section and a pull tab that projects outwardly from the lid. The accordiated section has at least one pleat. The projecting portion includes a frangible bridge. When the plastic food container is in the initially sealed state, the accordiated section has a first length and a first orientation relative to the projecting portion. When the container is in the initially sealed state and a first pulling force is applied to the pull tab, the frangible bridge ruptures. When the frangible bridge ruptures and before the lid is separated from the base, the container is in a tab-employed state in which the accordiated section springs outward and has a second length visibly longer than the first length.

Claims

1. A plastic container capable of assuming a loading state, an initially sealed state and an opened state, the plastic container comprising: a lid including a lid rim; a base including a bottom, a base rim and a side wall extending upwardly from the bottom to the base rim, the side wall surrounding the bottom; the lid rim formed for sealing engagement with the base rim; a projecting portion projecting outwardly from the lid; the projecting portion including an accordiated section connected to a pull tab; the accordiated section comprising at least one pleat; when the plastic food container is in the initially sealed state the accordiated section has a first length and a first orientation; the projecting portion further having a frangible bridge; the frangible bridge rupturing upon the application of a first pulling force to the pull tab when the container is in the initially sealed state; when the frangible bridge ruptures, the accordiated section has a second length visibly longer than the first length; and after the frangible bridge has ruptured, the lid separates from the base upon the further application of a pulling force applied to the pull tab.

2. The plastic container of claim 1 wherein the at least one pleat comprises two legs, each leg having a top and bottom and the two legs converging at their tops to meet at a peak.

3. The plastic container of claim 1 wherein; the lid rim includes a peripherally projecting lid rim flange; the projecting portion includes a shoulder; and the frangible bridge connects the shoulder to the lid rim flange.

4. The plastic container of claim 1, wherein the base rim includes a base rim projecting platform and when the container is in the initially sealed state the projecting portion superposes over the base rim projecting platform.

5. The plastic container of claim 3, wherein the base rim includes a base rim projecting platform and when the container is in the initially sealed state the projecting portion superposes over the base rim projecting platform.

6. The plastic container of claim 1 wherein when the frangible bridge ruptures, the accordiated section has a second orientation.

7. The plastic container of claim 3 wherein when the frangible bridge ruptures, the accordiated section has a second orientation.

8. The plastic container of claim 5 wherein when the frangible bridge ruptures, the accordiated section has a second orientation.

9. The plastic container of claim 1 wherein the base rim includes a base rim bead and when the container is in the initially sealed state the base rim bead contacts the projecting portion and causes the projecting portion to angle upwardly.

10. A plastic container capable of assuming a loading state, an initially sealed state and an opened state, the plastic container comprising: a lid including a lid rim; a base including a bottom, a base rim and a side wall extending upwardly from the bottom to the base rim, the side wall surrounding the bottom; the lid rim formed for sealing engagement with the base rim; a projecting portion projecting outwardly from the lid; the projecting portion including an accordiated. section connected to a pull tab; the accordiated section comprising at least one pleat; when the plastic food container is in the initially sealed state the accordiated section has a first length and a first orientation; the projecting portion having a first frangible bridge and a second frangible bridge; the first frangible bridge and the second frangible bridge rupturing upon the application of a first pulling three to the pull tab when the container is in the initially sealed state; when the first frangible bridge and second frangible bridge rupture, the accordiated section has a second length visibly longer than the first length; and after the first frangible bridge and second frangible bridge have ruptured, the lid separates from the base upon the further application of a pulling force applied to the pull tab.

11. The plastic container of claim 10 wherein the at least one pleat comprises two legs, each leg having a top and bottom and the two legs converging at their tops to meet at a peak.

12. The plastic container of claim 10 wherein: the projecting portion includes a first shoulder and a second shoulder; the lid rim includes a peripherally projecting lid rim flange; and the first frangible bridge connects the first shoulder to the lid rim flange and the second frangible bridge connects the second shoulder to the lid rim flange.

13. The plastic container of claim 10, wherein the base rim includes a base rim projecting platform and when the container is in the initially sealed state the projecting portion superposes over the base rim projecting platform.

14. The plastic container of claim 12, wherein the base rim includes a base rim projecting platform and when the container is in the initially sealed state the projecting portion superposes over the base rim projecting platform.

15. The plastic container of claim 10 wherein when the first and second frangible bridges rupture, the accordiated section has a second orientation.

16. The plastic container of claim 14 wherein when the first and second frangible bridges rupture, the accordiated section has a second orientation.

17. The plastic container of claim 10 wherein the base rim includes a base rim bead and when the container is in the initially sealed state the base rim bead contacts the projecting portion and causes the projecting portion to angle upwardly.

18. A projecting portion integrally formed in and projecting outwardly from a plastic container, the plastic container having a lid rim for sealing engagement upon a base rim and being capable of assuming a loading state, an initially sealed state and an opened state, the projecting portion comprising: an accordiated section connected to a pull tab; the accordiated section comprising at least one pleat; a shoulder; a frangible bridge; the accordiated section having a first length and a first orientation when the frangible bridge is intact; the frangible bridge rupturing upon the application of a first pulling force to the pull tab when the container is in the initially sealed state, the first pulling force being less than a second pulling force applied to the pull tab that is required to separate the lid from the base; the accordiated section having a second length when the frangible bridge is ruptured; and the second length being visibly longer from the first length.

19. The projecting portion of claim 18 wherein the accordiated section has a second orientation when the frangible bridge is ruptured and the second orientation is visibly different from the first orientation.

20. The projecting portion of claim 18 wherein the at least one pleat comprises two legs, each leg having a top and bottom and the two legs converging at their tops to meet at a peak.

21. The projecting portion of claim 18 wherein: the projecting portion includes a shoulder; and the frangible bridge connects the shoulder to the lid rim.

22. A projecting portion integrally formed in and projecting outwardly from a plastic container, the plastic container having a lid rim for sealing engagement upon a base rim and being capable of assuming a loading state, an initially sealed state and an opened state, the projecting portion comprising: an accordiated section connected to a pull tab; the accordiated section comprising at least one pleat; a first shoulder and a second shoulder; a first frangible bridge and a second frangible bridge; the accordiated section having a first length and an orientation when the first and second frangible bridges are intact; the first frangible bridge and the second frangible bridge rupturing upon the application of a first pulling force to the pull tab when the container is in the initially sealed state, the first pulling force being less than a second pulling force applied to the pull tab that is required to separate the lid from the base; and when the first frangible bridge and the second frangible bridge rupture, the accordiated section has a second length visibly longer than the first length.

23. The projecting portion of claim 22 wherein the accordiated section has a second orientation when the first and second frangible bridges are ruptured and the second orientation is visibly different from the first orientation.

24. The projecting portion of claim 22 wherein: the projecting portion includes a first shoulder and a second shoulder; the first frangible bridge connects the first shoulder to the lid rim; and the second frangible bridge connects the second shoulder to the lid rim.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1 is an exploded perspective view of the lid and base of a first embodiment of the present invention container in the loading state.

[0020] FIG. 2 is a side elevation view of the lid of the first embodiment present invention container.

[0021] FIG. 3 is a side elevation view of the base of the first embodiment present invention container.

[0022] FIG. 4 is a top plan view of the lid of the first embodiment present invention container.

[0023] FIG. 5 is a bottom plan view of the base of the first embodiment present invention container.

[0024] FIG. 6 is a top plan detail view of an embodiment accordiated tamper evident pull tab of the first embodiment container of the present invention showing its first length on the projecting portion when the container is in the loading state (prior to sealing of the lid to the base).

[0025] FIG. 7 is a perspective view of the first embodiment container in the initially sealed state.

[0026] FIG. 8 is a side elevation view of the first embodiment container in the initially sealed state.

[0027] FIG. 9 is a top plan view of the first embodiment container in the initially sealed state.

[0028] FIG. 10 is a bottom plan view of the first embodiment container in the initially sealed state.

[0029] FIG. 11 is detail perspective view of an embodiment accordiated tamper evident pull tab of the first embodiment container of the present invention showing its first length and first orientation on the projecting portion when the container is in the initially sealed state (prior to being initially opened or the pull tab being deployed).

[0030] FIG. 12 is a cross section detail view of an embodiment accordiated tamper evident pull tab of the first embodiment container of the present invention showing its first length and the positional relationship of the pull tab and projecting portion of the lid rim relative to the base rim when the first embodiment of the present invention container is in the initially sealed state.

[0031] FIG. 13 is a cross section detail view of an embodiment accordiated tamper evident pull tab of the first embodiment container of the present invention showing the length of the pull tab and its positional relationship to the projecting portion of the lid rim after the pull tab has been pulled by a user in order to open the first embodiment container from the initially sealed state.

[0032] FIG. 14 is a perspective detail view of an embodiment accordiated tamper evident pull tab of the first embodiment container of the present invention showing the length of the pull tab and its positional relationship to the projecting portion of the lid rim after the pull tab has been pulled by a user in order to open the first embodiment container from the initially sealed state.

[0033] FIG. 15 is a cross section view showing the components and positional relationship of the structures of the lid rim and base rim of the embodiment container of FIGS. 21-35 in the initially sealed state.

[0034] FIG. 16 is an exploded perspective view of the lid and base of a second embodiment of the present invention container in the loading state.

[0035] FIG. 17 is a detail perspective view showing for the second embodiment container the length of the accordiated section of the pull tab and the positional relationship of the pull tab relative to the projecting portion and the base rim when the second embodiment container is in the initially sealed state.

[0036] FIG. 18 is a detail section view showing for the second embodiment container the length of the accordiated section of the pull tab and the positional relationship of the pull tab relative to the projecting portion and the base rim when the second embodiment container is in the initially sealed state.

[0037] FIG. 19 is a detail perspective view showing for the second embodiment container the length of the accordiated section of the pull tab and the positional relationship of the pull tab relative to the projecting portion and the base rim after the pull tab has been pulled to open the second embodiment container from the initially sealed state.

[0038] FIG. 20 is a detail section view showing for the second embodiment container the length of the accordiated section of the pull tab and the positional relationship of the pull tab relative to the projecting portion and the base rim after the pull tab has been pulled to open the second embodiment container from the initially sealed state.

[0039] FIG. 21 is a perspective view of a third embodiment of the present invention container in the loading state.

[0040] FIG. 22 is a perspective view of a third embodiment of the present invention container in the initially sealed state.

[0041] FIG. 23 is a side elevation view of the third embodiment present invention container the initially sealed state.

[0042] FIG. 24 is a top plan view of the third embodiment present invention container in the initially sealed state.

[0043] FIG. 25 is a detail perspective view of the third embodiment container when the third embodiment container is in the initially sealed, but pull tab-employed (pulled), state.

[0044] FIG. 26 is a detail perspective view showing for the third embodiment container the length of the pull tab of the projecting portion and the positional relationship of the pull tab relative to the projecting portion and the base rim when the projecting portion has been pulled to open the third embodiment container, the container still remaining in the initially sealed state.

[0045] FIG. 27 is a detail side elevation view showing for the third embodiment container the length of the pull tab of the projecting portion and the positional relationship of the pull tab relative to the projecting portion and the base rim when the projecting portion has been pulled to open the third embodiment container, the container still remaining in the initially sealed state.

[0046] FIG. 28 is a detail section view showing for the third embodiment container the length of the pull tab of the projecting portion and the positional relationship of the pull tab relative to the projecting portion and the base rim when the projecting portion has been pulled to open the third embodiment container, the container still remaining in the initially sealed state.

[0047] FIG. 29 is a detail top plan view showing for the third embodiment container the length of the pull tab of the projecting portion and the positional relationship of the Pull tab relative to the projecting portion and the base rim when the projecting portion has been pulled to open the third embodiment container, the container still remaining in the initially sealed state.

[0048] FIG. 30 is a perspective view of the third preferred embodiment container wherein the accordiated pull tab of the present invention has been employed to separate the lid from the base of the container and thereby open the container from the initially sealed state.

[0049] FIG. 31 is a side elevation view of the third preferred embodiment container wherein the accordiated pull tab of the present invention has been employed to separate the lid from the base of the container and thereby open the container from the initially sealed state.

[0050] FIG. 32 is a front elevation view of the third preferred embodiment container wherein the accordiated pull tab of the present invention has been employed to separate the lid from the base of the container and thereby open the container from the initially sealed state.

[0051] FIG. 33 is a detail side elevation section view of a preferred embodiment accordiated pull tab on the third embodiment of the present invention container in the initially sealed, but tab-employed state.

[0052] FIG. 34 is a detail top plan view of the accordiated pull tab on the still initially sealed third embodiment container after the pull tab has been initially pulled and separated from the projecting portion.

[0053] FIGS. 35A-35C are top plan views of embodiment projecting portions for which the location of frangible bridges vary on the projecting portion.

DETAILED DESCRIPTION

[0054] FIGS. 1-35C depict preferred embodiments of a present invention tamper evident plastic container 1, 101 and 201 along with its preferred features. As is seen in the figures, the inventive container (whether in the embodiment of 1, 101 or 201) includes a lid 2 and a base 3. The inventive pull tab of the present invention can be embodied in a container that does not include a hinge as is shown in FIGS. 1-14 and 16-20. Alternatively, as is shown in FIGS. 21-34, the inventive pull tab can be part of a container 1 that includes a hinge 68 located on one side of the container. In practical use, the outer surface of floor 26 of base 3 will normally rest upon a surface (such as a table top) considered horizontal in reference to the user. Thus, the directional terms vertical and horizontal and the like are used to describe the container 1, 101 or 201 and its components with respect to the orientation illustrated in the figures and are employed merely for the purposes of clarity and illustration. The directional terms inner and inwardly and the like are used herein with respect to the described container to refer to directions along the directional component toward the geometric center of the container when the lid is sealed to the base. The directional term outer and the like are used herein with respect to the described container to refer to directions along the directional component away from the geometric center of the lid, base or the container when the lid is sealed to the base. The directional term peripherally is used herein with respect to the described container to refer to directions along the horizontal directional component away from the geometric center of the lid, base or the container when the lid is sealed to the base. Additionally, the terms upward, downward and the like are used to describe spatial relationships among structure when lid 2 of container 1, 101 or 201 is sealed or closed upon the base 3. For example, FIGS. 25 through 28 show a third embodiment container 201 when container 201 is in an initially sealed state. In the orientation shown in FIGS. 25 through 28, lid 2 is vertically above base 3 and projecting portion 6 is outwardly disposed of lid rim 4.

[0055] FIGS. 1-14 depict a first preferred embodiment present invention tamper evident plastic container 1. As is seen in the figures, the inventive container 1 includes a lid 2 and a base 3 that are not attached to each other through a hinge. First preferred embodiment container 1 is capable of assuming a loading state (FIG. 1), an initially sealed state (FIGS. 7-9), and an opened state or tab-employed state wherein the pull tab 40 of the projecting portion 6 has been employed. (FIGS. 13-14). Lid 2 includes lid rim 4. Lid rim 4 includes lid rim flange 9, which is preferably horizontally outwardly extending. Container 1 further includes base 3, which has bottom (floor) 26, base rim 5 and side wall 27 extending upwardly from bottom 26 to base rim 5. Side wall 27 surrounds bottom 26. Lid rim 2 is formed for sealing arrangement with base rim 7. Base rim may include base rim flange 10.

[0056] As explained below, lid 2 is unsealed from base 3 through application of a sustained first pulling force to pull tab 40. Upon application of a first pulling force to pull tab 40 one or more frangible bridges 48 (numbered as 48a, 48b in the drawings) connecting pull tab 40 to projecting portion 6 are caused to break and accordiated section 41 on projecting portion 6 expands from its original state. This is shown in FIGS. 13 and 14. It is to be noted that the figures show preferred embodiment containers and projecting portions having two frangible bridges. This is merely a preferred embodiment of the invention as the invention can be effected with one frangible bridge. Continuing to pull on pull tab 40, particularly in an upward manner, results in unsealing lid 2 from base 3. Thus, container 1 and pull tab 40 can assume a tab-employed state or arrangement prior to actually opening container 1. This state is shown in FIGS. 13-14. It is to be noted that the further application of a pulling force to pull tab 40 after expansion of accordiated section 41 causes lid 2 to unseal from base 3. Additionally, container 1, after being unsealed from the initially sealed state can be re-sealed (closed). In this re-sealed state, projecting portion 6 and pull tab 40 of container 1 would appear as in FIGS. 13-14.

[0057] As seen in the figures, first embodiment container 1 comprises lid 2 and base 3. Lid 2 includes cover portion 33 and lid rim 4. Lid rim 4 circumferentially extends about the periphery of lid 2. In the preferred embodiment, lid rim 4 includes lid rim bead 17. Base 3 includes base rim 5 circumferentially extending about the periphery of base 3. Base rim 5 includes base rim bead 11 that comprises upwardly extending inner vertical wall 12, downwardly extending outer 13 and bead top segment 14, Bead top segment 14 extends from top of upwardly extending inner vertical wall 12 to top of the downwardly extending outer wall 13. Upwardly extending inner wall 12 includes an undercut surface configured (shaped and sized) to receive and frictionally engage lid rim flange 9 of lid rim 4 when container 1 is in the sealed or closed arrangement. When container 1 is in the sealed arrangement lid rim flange 9 assumes a protected position below top segment 14 of base rim bead 11.

[0058] In the context of the first embodiment container, an embodiment pull tab 40 of the present invention can be seen in FIGS. 1, 6, 7, 8 and 11-14. Container 1 includes projecting portion 6 projecting outwardly from lid 2, preferably from lid rim 4. In the preferred embodiment, projecting portion 6 is integrally formed in and projects outwardly from lid rim flange 9. Projecting portion 6 includes pull tab 40 that comprises accordiated section 41 connected to gripping tip 42. Accordiated section 41 comprises at least one pleat 43. In the depicted embodiment, pull tab 40 of container 1 has three pleats 43, but could have more or less. At least one pleat 43 preferably comprises two legs 44. Each leg 44 has a top 45 and a bottom 46. Legs 44 converge at their tops 45 to meet at peak 47.

[0059] First embodiment present invention container 1 includes projecting portion 6. Projecting portion 6 includes at least one shoulder, but preferably has two shoulders 7a, 7b. FIGS. 6, 11 show a preferred embodiment projecting portion 6 in which one or more frangible bridges 48a, 48b respectively connect at least one pleat 43 to shoulders 7a, 7b. This is merely an illustrative embodiment.

[0060] When container 1 is in the loading state or the initially sealed state, accordiated section 41 has a first length 50a, which for visual comparison purposes can be measured relative to projecting portion 6. One or more frangible bridges 48a, 48b rupture upon the application of a pulling force to pull tab 40 when container 1 is in the initially sealed state. When one or more frangible bridges 48a, 48b rupture, accordiated section 41 has a second length 50b visibly different from first length 50a. In the exemplary embodiment shown in FIGS. 6 and 11, pleat 43 is connected to projecting portion 6 by two frangible bridges 48a, 48b.

[0061] In the embodiment shown in FIGS. 1-14, base rim 5 includes base rim projecting platform 52. Projecting portion 6 constitutes a localized planar extension of peripheral projecting lid rim flange 9. When container 1 is closed, projecting platform 52 helps protect projecting portion 6 and its integral pull tab 40 from compression damage or being inadvertently snagged. Gripping tip 42 preferably includes surface texture 55 to aid in holding gripping tip 42. In the various depicted embodiments, surface texture 55 is exemplarily shown as arcuate ribs, but could include other known textures including different shaped ribs, knurling, raised bumps or letterings as shown in the drawings.

[0062] As noted, projecting portion preferably includes two shoulders, first shoulder 7a and a second shoulder 7b. In the embodiment shown in FIGS. 1-14, first frangible bridge 48a connects at least one pleat 43 to first shoulder 7a and second frangible bridge 48h connects at least one pleat 43 to second shoulder 7b. When container 1 is in the loading state or the initially sealed state, accordiated section 41 has a first length 50a. When lid 2 is sealed onto base 3, projecting portion 6 is forced upward by the position of base rim bead 11. Base rim bead 11 thus contacts projecting portion 6 and causes it to angle upwardly, which makes pull tab 40 more easily graspable and give projecting portion 6 an upwardly angled orientation relative to platform 52. First and second frangible bridges 48a, 48b rupture upon the application of a pulling force to pull tab 40 when container 1 is in the initially sealed state. When frangible bridges 48a, 48b rupture, pull tab 40 is in the tab-employed state and accordiated section 41 has a second length 50b that is visibly different from first length 50a. In the preferred embodiment, lid rim 4 includes lid rim flange 9 and projecting portion 6 is integrally formed in and projects outwardly from lid rim flange 9.

[0063] The one or more frangible bridges 48a, 48b are formed as a relatively weaker material than other portions of projecting portion 6, such as pleat 43 or shoulders 7a, 7b. By virtue of being formed of weakened material, frangible bridges 48a, 48b rupture upon the application of a first pulling force to pull tab 40 when the container is in the initially sealed state that does not cause lid 2 to separate from base 3. In the depicted preferred embodiment, projecting portion 6 has two shoulders, first shoulder 7a and second shoulder 7b and pull tab 40 is interposed between shoulders 7a, 7b. In the embodiment in which bridges 48a, 48b connect to a portion of accordiated section 41, frangible bridges 48a, 48b may respectively connect to shoulders 7a, 7b directly or via a riser 60 as shown in the figures. When container 1 is in the loading state or the initially sealed state, at least one pleat 43 in accordiated section 41 is connected to projecting portion 6. In the depicted preferred embodiment this connection is achieved by a first frangible bridge 48a extending from pleat 43 to riser 60 on first shoulder 7a and by second frangible bridge 48b extending from pleat 43 to riser 60 on second shoulder 7b. When the at least one pleat 43 is connected in such fashion, pull tab 40 and accordiated section 41 has a visible first length 50a and a first orientation (substantially parallel) relative to projecting portion 6. In the figures showing a preferred embodiment projecting portion 6 in which accordiated section 41 has three pleats 43, each pleat 43 is thus bookended by a pair of risers 60. Risers 60 are shaped similarly to a transverse cross-section of pleats 43 in terms of kg length and the angle between legs 44. Wherever first frangible bridge 48a and second frangible bridge 48b are located, it is preferable that they be integrally formed in projecting portion 6 by thinning, scoring or skip-perforating (collectively referred to as weakening) the plastic extending between he structures intended to separate (pleat 43 and riser 60 in the case of the embodiment shown in FIGS. 6 and 11).

[0064] As seen in the figures, projecting portion 6 and its associated accordiated section 41 deforms by operation of expansion of pleats 43 and not by operation of serration-like structures such as recesses or ribs (protrusions) formed on its surface. Accordingly, it provides a very reliable and noticeable deformation both in terms of visible difference. Plus, in terms of tactile feel when the accordiated section 41 pops by virtue of the rupturing of one or more frangible bridges 48a, 48b. However, being of weakened material, frangible bridges 48a and 48b rupture upon the application of a first pulling force to pull tab 40 when the container is in the initially sealed state. To break frangible bridges 48a, 48b, an outwardly directed pulling force is applied to pull tab 40 by way of grasping gripping tip 42. Notably, as shown in FIGS. 1-14, when first frangible bridge 48a and second frangible bridge 48b rupture upon the application of a first pulling force to pull tab 40, accordiated section 41 has a second length 50b visibly different from first length 50a. Also, a visible separation 61 is observable in the separated structures of pull tab 40. Application of a continued or further pulling force to pull tab 40 after rupture of frangible bridges 48a, 48b results in lid 2 separating from base 3.

[0065] The present invention is not just directed to the container shown, but more specifically to the projecting portion 6 described herein. A preferred embodiment projecting portion 6 is integrally formed in and projects outwardly from a plastic container 1. The plastic container is capable of assuming a loading state, an initially sealed state and an opened state. The container can also assume a tab-employed state in which the container lid is still sealed to the base. The projecting portion 6 comprises an accordiated section 41 connected to a pull tab 40. Accordiated section 41 comprises at least one pleat 43. Projecting portion 6 further includes at least one shoulder (shown in the embodiments as two shoulders 7a, 7b). Projecting portion 6 includes one or more frangible bridges 48a, 48b. Accordiated section 41 has a first length 50a when one or more frangible bridges 48a, 48b are intact. In the case of containers 101, 201 of the second and third embodiment, pull tab 40 and accordiated section 41 can also have a first orientation 51a when one or more frangible bridges 48a, 48b are intact. Accordiated section 41 has a second length 50b when one or more frangible bridges 48a, 48b are ruptured. Second length 50b is visibly longer and different from first length 50a. In the second and third embodiment containers 101, 201, pull tab 40 and accordiated section 41 also has a second orientation 51b when one or more frangible bridges 48a, 48b are ruptured whereby second orientation 51b is visibly different from first orientation 51a. Also, a visible separation 61 is observable in the separated structures of pull tab 40.

[0066] As in the case of container 1, a more preferred embodiment projecting portion 6 includes two shoulders, first shoulder 7a and a second shoulder 7b. It correspondingly has a first frangible bridge 48a and a second frangible bridge 48b. When the inventive container in any of its embodiments is in the loading state or the initially sealed state, accordiated section 41 has a first length 50a relative to projecting portion 6. Also when the inventive container in any of its embodiments is in the loading state or the initially sealed state, pull tab 40 and accordiated section 41 has a first orientation 51a relative to projecting portion 6. In the case of containers 101 and 201 of the second and third embodiments respectively, accordiated section 41 has a first horizontal orientation 51a when frangible bridges 48a and 48b are intact. First and second frangible bridges 48a, 48b rupture upon the application of a pulling force to pull tab 42 when container 1 (or 101 or 201) is in the initially sealed state. When frangible bridges 48a, 48b rupture, accordiated section 41, and thus pull tab 40, has a second length 50b that is visibly different from first length 50a. When frangible bridges 48a, 48b rupture, pull tab 40 and accordiated section 41 has a second orientation 51b that is different from first orientation 51a. In the case of the second and third embodiment containers 101, 201 the difference of the second orientation is more patent. As seen in FIGS. 16-20 and 21-34, pull tab 40 and accordiated section 41 also have a second orientation 51b when frangible bridges 48a and 48b are ruptured whereby second orientation 51b is markedly visibly different from first orientation 51a.

[0067] FIGS. 16-20 depict a second preferred embodiment present invention tamper evident plastic container 101 along with its preferred features. As is seen in the figures, the inventive container 101 includes a lid 2 and a base 3. Second preferred embodiment container 101 is capable of assuming a loading state (FIG. 16), an initially sealed state (in which its projecting portion is disposed as is shown in FIGS. 17 and 18), a tab-employed state (in which the pull tab portion is disposed as is shown in FIGS. 19-20. Continuing to pull on pull tab 40 after the container is in the tab-employed state operates to remove the lid from the base and place the container in an opened state. Lid rim 2 includes lid rim 4. Lid rim 4 includes lid rim flange 9, which is preferably horizontally outwardly extending. Container 101 further includes base 3, which has bottom (floor) 26, base rim 5 and side wall 27 extending upwardly from bottom 26 to base rim 5. Side wall 27 surrounds bottom 26. Lid rim 2 is formed for sealing arrangement with base rim 7.

[0068] As explained below, after one or more frangible bridges 48a, 48b rupture, lid 2 is unsealed from base 3 through continued or further application of a pulling force to pull tab 40. Upon application of a first pulling force to pull tab 40 one or more frangible bridges 48a, 48b connecting pull tab 40 to projecting portion 6 are caused to break. Continuing to pull or applying a discrete second pulling force on pull tab 40, (i.e., further application of a pulling force to pull tab 40) particularly in an upward manner, results in unsealing lid 2 from base 3. Thus, container 101 and pull tab 40 can assume a tab-employed state or arrangement prior to actually opening container 101. This state is shown in FIGS. 19-20. Additionally, container 201, after being unsealed from the initially sealed state can be re-sealed (closed). In this re-sealed state, container 201 would also appear as in FIGS. 19-20.

[0069] As seen in the figures, second embodiment container 101 comprises lid 2 and base 3. Lid 2 includes cover portion 33 and lid rim 4. Lid rim 4 circumferentially extends about the periphery of lid 2. The overall rim structural features that make the second embodiment container not just tamper evident, but also tamper resistant are similar to those shown in FIG. 15 and are described infra with respect to the third embodiment container. However, in the case of the second embodiment container, bead top segment 14 includes an upwardly projecting guard bead 31. Guard bead 31 peripherally and continuously extends atop base rim bead 11 except for one gap (a discontinuity) 64 sized to allow projecting portion 6 to extend there through when the container is in the sealed state. Guard bead 31 thus serves as a barrier to accessing lid rim flange 9 when container 101 is in the sealed state.

[0070] The inventive pull tab 40 of the second embodiment container is identical to that of the first embodiment container and the frangible bridge or bridges can be located as is described above and shown in FIGS. 6, 11 and 35A-35C. By virtue of the rim structures utilized in the second embodiment container 101, projecting portion 6 is not biased and held at an upward angle relative to base rim 5 as in the case of container 1. This different rim structure allows not just the length of projecting portion 6 to provide a visible indicator of the pull tab 40 being employed, but also its orientation. In this respect, when container 101 is in the loading state or the initially sealed state, accordiated section 41 has a first length 50a, which for visual comparison purposes can be measured relative to projecting portion 6. Accordiated section 41 also preferably has a first orientation 51a, which for discernment purposes can be more easily seen relative to projecting portion 6 and platform 52 of base 3. One or more frangible bridges 48a, 48b rupture upon the application of a pulling force to pull tab 40 when container 101 is in the initially sealed state. When frangible bridges 48a, 48b rupture, accordiated section 41 has a second length 50b visibly different from first length 50a. As explained above, projecting portion 6 preferably has two frangible bridges 48a, 48b, but the invention can be practiced with only one bridge.

[0071] In the second embodiment, base rim 5 includes base rim projecting platform 52. When container 101 is in the initially sealed state, projecting portion 6 superposes over base rim projecting platform 52. Thus, when container 201 is closed, projecting platform 52 helps protect projecting portion 6 and its integral pull tab 40 from compression damage or being inadvertently snagged. Gripping tip 42 preferably includes surface texture 55 to aid in holding gripping tip 42. Platform 52 also serves to provide a visible reference for the orientation of projecting portion 6 both before and after activation of pull tab 40. In this respect, accordiated section can also be formed with a strong memory such that the rupturing of one or more frangible bridges 48a, 48b causes projecting portion 6 to have a second orientation 51b visibly different from first orientation 51a. As used herein, the term orientation in reference to projecting portion 6 means its orientation relative to the angle of position of projecting platform 6. In the case of second embodiment container 101, the orientation of projecting platform 6 is generally horizontal and aligned with platform 52 projecting from base rim 5, Platform 52 thus serves to emphasize and delineate the orientation of pull tab 40. Thus, when frangible bridge 48a ruptures, the memory in accordiated section 41 causes at least pull tab 40 to angle upward and increase distance from platform 52. Thus, in addition to changing the length of the accordiated section and the pull tab, the rupturing of one or more frangible bridges 48a, 48b also preferably causes pull tab 40 to visibly change orientation from first orientation 51a to second orientation 51b as shown in FIGS. 19-20. In the preferred embodiment, lid rim 4 includes lid rim flange 9 and projecting portion 6 is integrally formed in and projects outwardly from lid rim flange 9.

[0072] As seen in FIGS. 16-20, pull tab 40 and its associated accordiated section 41 deforms (extends) by operation of expansion of pleats 43 and not by operation of serration-like structures such as recesses or ribs (protrusions) formed on its surface. Accordingly, it provides a very reliable and noticeable deformation both in terms of visible difference, plus in terms of tactile feel when the accordiated section 41 pops by virtue of the rupturing of frangible bridges 48a, 48b. However, being of weakened material, frangible bridges 48a and 48b rupture upon the application of a first pulling force to pull tab 40 when the container 101 is in the initially sealed state. To break frangible bridges 48a, 48b, an outwardly directed pulling force is applied to pull tab 40 by way of grasping gripping tip 42. Notably, as shown in FIGS. 16-20, when first frangible bridge 48a and second frangible bridge 48b rupture upon the application of a pulling force to pull tab 40, pull tab 40 and accordiated section 41 have a second length 50b visibly different from first length 50a. In the preferred embodiment, a second orientation 51b is visibly different from first orientation 51a. In the preferred embodiment, second orientation 51b is visibly angled upward from projecting portion 6 in relation to its previous parallel or flush position with projecting portion 6 due to being fixed by frangible bridges 48a, 48b.

[0073] FIGS. 21-36 depict a third preferred embodiment present invention tamper evident plastic container 201 along with its preferred features. As is seen in the figures, the inventive container 201 includes a lid 2 and a base 3 attached to each other through a hinge 68 located on one side of the container when sealed. The third embodiment container includes the inventive projecting portion described with reference to the second embodiment container or shown in the figures.

[0074] As shown FIGS. 21-34, third preferred embodiment container 201 is capable of assuming a loading state (FIGS. 21-24), an initially sealed state (FIGS. 25-28), a tab-employed state (FIGS. 33-34) in which the container may still remain sealed or be opened and an opened state (FIGS. 31, 32). Lid rim 2 includes lid rim 4. Lid rim 4 includes lid rim flange 9, which is preferably horizontally outwardly extending. Container 201 further includes base 3, which has bottom (floor) 26, base rim 5 and side wall 27 extending upwardly from bottom 26 to base rim 5. Side wall 27 surrounds bottom 26. Lid rim 2 is formed for sealing arrangement with base rim 7.

[0075] As explained below, lid 2 is unsealed from base 3 through application of a sustained pulling force to pull tab 40. Upon application of an initial pulling force to pull tab 40 one or more frangible bridges 48a, 48b connecting pull tab 40 to projecting portion 6 are caused to break. Further application of a pulling force on pull tab 40, particularly in an upward manner, results in unsealing lid 2 from base 3. Thus, container 201 and pull tab 40 can assume a tab-employed state or arrangement prior to actually opening container 201. This state is shown in FIGS. 33, 34. Additionally, container 201, after being unsealed from the initially sealed state can be re-sealed (closed). In this re-sealed state, container 201 would appear as in FIGS. 33, 34.

[0076] As seen in the figures, third embodiment container 201 comprises lid 2 and base 3. Lid 2 includes cover portion 33 and lid rim 4. Lid rim 4 circumferentially extends about the periphery of lid 2. FIG. 15 depicts preferred embodiment rim structural features that make the third embodiment container not just tamper evident, but also tamper resistant. In the preferred embodiment, lid rim 4 includes lid rim bead 17 that comprises a downwardly descending lid rim inner vertical wall 18, an upwardly extending lid rim outer wall 19 and a bead bottom segment 20. Bead bottom segment 20 extends from the bottom 21 of lid rim inner wall 18 and curves into the bottom 22 of the lid rim outer wall 19. Base 3 includes base rim 5 circumferentially extending about the periphery of base 3. Base rim 5 includes base rim bead 11 that comprises upwardly extending inner vertical wall 12, downwardly extending outer wall 13 and bead top segment 14. Bead top segment 14 extends from top 15 of upwardly extending inner vertical wall 12 to top 16 of the downwardly extending outer wall 13. Upwardly extending inner wall 12 includes undercut surface 24 configured (shaped and sized) to receive and frictionally engage outer wall 19 of lid rim 4 when container 201 is in the sealed or dosed arrangement. When container 201 is in the sealed arrangement lid rim flange 9 assumes a position above or on top of the top surface 25 of top segment 14 of base rim bead 11. As the figures also show, lid rim 4 is structured such that it includes lid rim flange 9 connected to lid rim outer wall 19. Lid rim outer wall 19 is of such height that lid rim flange 9 is positioned higher than cover portion 33 of lid 2. As an added tamper resistance feature against prying or grasping of the lid rim, cover portion 33 includes one or more elongate cover beads 34 protruding upward from the outer surface 35 of cover portion 33. Bead 34 is optimally positioned 5 millimeters or less from lid rim outer wall 19 to prevent grasping of lid rim flange 9.

[0077] In the context of container 201, the inventive pull tab 40 of the present invention is best seen in FIGS. 26-29, 33 and 34. Container 201 includes projecting portion 6 integrally formed in and projecting outwardly from lid 2, preferably from lid rim 4. In the preferred embodiment, projecting portion 6 is integrally formed in and projects outwardly from lid rim flange 9. Projecting portion 6 includes pull tab 40 that comprises accordiated section 41 connected to gripping tip 42. Accordiated section 41 comprises at least one pleat 43. In the depicted embodiment, pull tab 40 of container 201 has three pleats 43, but could have more or less. At least one pleat 43 preferably comprises two legs 44. Each leg 44 has a top 45 and a bottom 46. Legs 44 converge at their tops 45 to meet at peak 47.

[0078] The present invention container 201 includes projecting portion 6. Projecting portion 6 includes one or more shoulders 7a, 7b. The exemplary embodiment of FIGS. 26-29, 33 and 34 can have frangible bridges 48a and 48b that can respectively connect at least one pleat 43 to shoulders 7a, 7b or can connect pull tab 40 to shoulders 7a, 7b as is shown in FIG. 35B. When container 201 is in the loading state or the initially sealed state, accordiated section 41 has a first length 50a, which for visual comparison purposes can be measured relative to projecting portion 6. Accordiated section 41 also preferably has a first orientation 51a, which for discernment purposes can be more easily seen relative to projecting portion 6 and base 3. Frangible bridges 48a, 48b rupture upon the application of a pulling force to pull tab 40 when container 201 is in the initially sealed state. When frangible bridges 48a, 48b rupture, accordiated section 41 has a second length 50b visibly different from first length 50a.

[0079] In the preferred embodiment, base rim 5 includes base rim projecting platform 52. When container 201 is in the initially sealed state, projecting portion 6 superposes over base rim projecting platform 52. Projecting portion 6 constitutes a localized planar extension of peripheral projecting lid rim flange 9. On the other hand, platform 52 preferably includes outer wall 13 to add rigidity to platform 52. Thus, when container 201 is closed, projecting platform 52 helps protect projecting portion 6 and its integral pull tab 40 from compression damage or being inadvertently snagged. To aid in grasping gripping tip 42, platform 52 may include cavity 53 on platform surface 54. Gripping tip 42 preferably includes surface texture 55 to aid in holding gripping tip 42. in the depicted embodiment, surface texture 55 is exemplarily shown as arcuate ribs, but could include other known textures including differently shaped ribs, knurling, raised bumps or lettering. Platform 52 also serves to provide a visible reference for the orientation of projecting portion 6 both before and after activation of pull tab 40. In this respect, accordiated section can also be formed with a strong memory such that the rupturing of one or more frangible bridges 48a, 48b causes projecting portion 6 to have a second orientation 51b visibly different from first orientation 51a. As used herein, the term orientation in reference to projecting portion 6 means its orientation relative to the container's horizontal direction, which horizontal direction platform 52 serves to emphasize and delineate. Thus, when frangible bridge 50a ruptures, the memory in accordiated section 41 causes at least pull tab 40 to angle upward and increase distance from platform 52.

[0080] The preferred embodiment projection portion has at least one frangible bridge, but is discussed and shown in the drawings in a preferred embodiment with two frangible bridges, which provide symmetry and balance to projecting portion 6 and pull tab 40. Similarly, in the preferred embodiment, projecting portion includes two shoulders, first shoulder 7a and a second shoulder 7b. Thus, by way of example, in one embodiment, the projecting portion could include first frangible bridge 48a connecting the at least one pleat 43 to first shoulder 7a and a second frangible bridge 48b connecting the at least one pleat 43 to second shoulder 7b. When container 201 is in the loading state or the initially sealed state, accordiated section 41 has a first length 50a and a first orientation 51a relative to projecting portion 6. First and second frangible bridges 48a, 48b rupture upon the application of a pulling force to pull tab 42 when container 201 is in the initially sealed state. When frangible bridges 48a, 48b rupture, accordiated section 41 has a second length 50b that is visibly different from first length 50a. The rupturing of frangible bridges 48a, 48b also preferably causes projecting portion 6 to visibly change orientation from first orientation 51a to second orientation 51b as shown in the figures. In the preferred embodiment, lid rim 4 includes lid rim flange 9 and projecting portion 6 is integrally formed in and projects outwardly from lid rim flange 9.

[0081] Frangible bridges 48a, 48b are formed as a relatively weaker material than pleat 43, shoulders 7a, 7b, or flange 9. By virtue of being formed of weakened material, frangible bridges 48a, 48b rupture upon the application of a first pulling force to pull tab 40 when the container is in the initially sealed state. Ideally, this first pulling force should be significantly less than the pulling force necessary to unseal lid 2 from base 3, though testing on prototypes indicates that it is not necessarily the peak force differences between bridge frangibility and container separability, but the amount of work that determines optimum operation. In the depicted preferred embodiment, projecting portion 6 has two shoulders, first shoulder 7a and second shoulder 7b and pull tab 40 is interposed between shoulders 7a, 7b. In one embodiment, frangible bridges, 48a, 48b each respectively connect to shoulders 7a, 7b via a riser 60. When container 201 is in the loading state or the initially sealed state, the at least one pleat 43 in accordiated section 41 is connected to projecting portion 6. In the depicted preferred embodiment this connection is achieved by a first frangible bridge 48a extending from pleat 43 to riser 60 on first shoulder 7a and by second frangible bridge 48b extending from pleat 43 to riser 60 on second shoulder 7b. When the at least one pleat 43 is connected in such fashion, accordiated section 41 has a visible first length 50a and a first orientation 51a (substantially parallel) relative to projecting portion 6. In the figures showing a preferred embodiment projecting portion 6 in which accordiated section 41 has three pleats 43, each pleat 43 is thus bookended by a pair of risers 60. Risers 60 are shaped similarly to a transverse cross-section of pleats 43 in terms of leg length and the angle between legs 44. In the depicted embodiment first frangible bridge 48a and second frangible bridge 48b are integrally formed in projecting portion 6 and can be formed by thinning, scoring or skip-perforating (collectively referred to as weakening) the plastic extending between pleat 43 and riser 60.

[0082] As seen in the figures, projecting portion 6 and its associated accordiated section 41 deforms by operation of expansion of pleats 43 and not by operation of serration-like structures such as recesses or ribs (protrusions) formed on its surface. Accordingly, it provides a very reliable and noticeable deformation both in terms of visible difference, plus in terms of tactile feel when the accordiated section 41 pops by virtue of the rupturing of frangible bridge 48a or bridges 48a, 48b. However, being of weakened material, frangible bridges 48a and 48b rupture upon the application of a first pulling force to pull tab 40 when the container is in the initially sealed state. To break frangible bridges 48a, 48b, an outwardly directed pulling force is applied to pull tab 40 by way of grasping gripping tip 42. Notably, as shown in FIGS. 33-36, when first frangible bridge 48a and second frangible bridge 48b rupture upon the application of a first pulling force to pull tab 40, accordiated section 41 has a second length 50b visibly different from first length 50a. In the preferred embodiment, it also has a second orientation 51b visibly different from first orientation 51a. In the preferred embodiment, second orientation 51b is visibly angled upward from projecting portion 6 in relation to its previous parallel or flush position with projecting portion 6 due to being fixed by frangible bridges 48a, 48b.

[0083] In the embodiment in which the a frangible bridge connects to a pleat, it is preferred that the frangible bridge be located at the point where it can extend directly from the pleat to the shoulder. Moreover, though FIGS. 1-34 show a preferred embodiment projecting portion 6 in which frangible bridges 48a, 48b respectively connect at least one pleat 43 to risers 60 on shoulders 7a, 7b, this is merely an illustrative embodiment. In alternative embodiments of projecting portion 6, the one or more one frangible bridge 48a, 48b could be respectively located between shoulders 7a, 7b and pull tab 40. This is shown in FIG. 35A. Alternatively, as shown in FIG. 35B, projecting portion 6 could comprise first proximal shoulder 107a, second proximal shoulder 107b, first distal shoulder 108a and second distal shoulder 108b. In this embodiment frangible bridge 48a could be located between first proximal shoulder 107a and first distal shoulder 108a. A second frangible bridge 48b could be located between second proximal shoulder 107b and second distal shoulder 108b. In tests of various pull tab and projecting portion configurations, the configuration of the projecting portion shown in FIG. 35C has shown to work best to ensure that end users grasp the portion of the pull tab that is distal to the frangible bridges. When a user grasps beyond the gripping tip 42 of pull tab 40 of projecting portion 6 such that he or she grasps a portion of projecting portion 6 that is proximal to frangible bridges 48a, 48b, then it is possible that the user could pull the lid and base apart without rupturing the frangible bridges 48a, 48b. Thus, as is shown in FIG. 35C, a preferred embodiment container and projecting portion would have a frangible bridge extending from a shoulder 7a of projecting portion 6 to flange 9 of lid rim 4. In the shown preferred embodiment of FIG. 35C, the container has a first frangible bridge 48a extending from shoulder 7a to flange 9 and a second frangible bridge 48b extending from shoulder 7b to flange 9.

[0084] Referable to FIGS. 35A-35C, in tests of prototypes, placing of the bridge wholly in the shoulder or at its proximal end nearest the lid flange aided break consistency. Additionally, though the frangible bridge may be formed as a web extending between structures, in the preferred embodiments, the frangible bridge is a distinct point between structures. It is also preferable that the gripping tip be as distant as possible from the frangible bridges. Doing so ensures that end users grab the gripping tip and not the entire projecting portion or the entire pull tab. Additionally, though for simplicity's sake the pull tab is shown to deform in one direction, depending on how (i.e., what direction) the pull tab is pulled, the pull tab can achieve a second orientation in which it is up, down or a combination of off to a side relative to its first orientation. The key is that the pull tab is always different from the first or original orientation when the container is first loaded and closed.

[0085] A container and projecting portion constructed in accordance with the present invention can be manufactured in a variety of shapes and sizes, and is preferably formed of resins or plastic materials including, but not limited to, polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate (PET) or high impact polystyrene (HIPS). The container is preferably thermoformed, but can be blow-molded or injection molded. The container lid and base, as well as the projecting portion, can be transparent or translucent, and may be colored in either instance. The container can be provided with vents to promote the flow of air or steam in or out of the container. Further, the container can be of any shape, including round or polygonal. As shown in the figures, the rim structures of the container may be adapted to include a hinge such that the lid and base are connected to each other in a clamshell configuration.

[0086] Having described the invention in detail, those skilled in the art will appreciate that modifications may be made of the invention without departing from its spirit. Therefore, it is not intended that the scope of the invention be limited to the specific embodiment illustrated and described.