Patent Grant
10836542
Not applicable.
Not applicable.
This invention relates generally to plastic food containers. The invention is more specifically related to resealable plastic food containers having tamper evident sealing mechanisms.
It is known to use plastic containers in the food preparation and restaurant industry to package prepared foods. The typical food container of the prior art consists of a clear or solid colored base and a clear lid. In order to maintain the quality of food contents and prevent tampering with the contents of a sealed container, it is desirable that the food container, once initially sealed, not be capable of being initially opened without visible indication of the container having been opened. To achieve this feature, container manufacturers have designed containers having integral tamper evident features. Typically, these containers consist of a lid that is hingedly attached to a base. The lid seals to the base by superposing the rim of the lid upon the rim of the base. These types of plastic containers are sold as one-piece containers and are often referred to as “clamshell” containers or packages.
In one type of hinged tamper evident container, the lid and base each have interlocking elements respectively located on or near the lid rim and base rim where the two rims meet when the container is sealed (i.e., at a non-hinged side or portion of the container). The interlocking element of the lid or base is conventionally located on a tab or flange extending from the rim of the lid or base. Either or both of the tabs are attached to their respective rims by a frangible section of plastic. When the lid and base are placed in initial sealing arrangement, the interlocking elements on or near the lid rim and base rim engage and lock together. In order to open the initially sealed container, the frangible section of one or both tabs must be ruptured so as to release the tab or tabs from the container. Because the interlocking sealing elements are located on the tabs, rupturing one or more tabs from the container disables the locking mechanism. The ruptured tab provides evidence of the container having been opened. One shortcoming with the prior art food container described above is that the interlocked tabs can be cut from the container in clean fashion using scissors or another cutting implement so as to remove any indicia of the container having had a tamper evident mechanism. Also, with many tamper evident containers, one rim (typically the lid rim) superposes over the other rim (typically the base rim) such that at least one of the rim edges is exposed and subject to manipulation. With this type of sealing arrangement and construct in plastic containers, the lid and base can be partially pried open by inserting a thin object underneath an exposed rim edge at a point on the container distal from the tamper indicator. By partially prying open the rims in this fashion, one can doctor or tamper with the contents of the apparently sealed container without activating the tamper indicator.
In view of the issues presented by incorporating a tamper evident mechanism in the meeting rims of the hinged container, some manufacturers have incorporated tamper evident features as part of the structure that forms or includes the hinge. In these containers, the container is designed to require a severance near the hinge in order to unseal (initially open) the container. This construct makes the hinge a single use hinge. These containers typically employ a square-shaped hinge arrangement (as seen from the side when the container is closed) in which the flange of the lid rim extends beyond the lid rim and then near-perpendicularly connects to a vertical segment that descends down from the lid flange. The vertical segment meets an extended portion of the base flange in similar near-perpendicular arrangement. The two flanges generally run parallel to each other and by their connection to the vertical segment form three sides of a square.
Square-shaped hinge containers suffer from a variety of deficits. One is a tendency of the container not to remain fully open for purposes of filling the container. The memory of the square hinge mechanism is such that the lid tends to rotate and cover all or part of the base. Another deficit is that the squeezing action required must move two adjacent, near perpendicular sides of the hinge structure and therefore the entire hinge structure must be effectively crushed in order to break the frangible line located at the bottom outside corner of the hinge structure. Thus, in order to rupture the frangible line, a squeezing force is applied to the entire box structure of the hinge area. This extended crushing motion may require the container to be stabilized with one's other hand in order to entirely rupture the frangible section.
Other tamper evident solutions involve using tabs that when activated remain attached to the container in a deformed condition and provide visible indication of the opening of the container. U.S. Published Patent Application No. 20100181323 (Thaler) is an example of one such tamper evident solution. This reference discloses a plastic food container that includes a lid adapted for sealing arrangement with a base. The rim of the base has an undercut formation adapted to receive the perimeter flange and flange tab of the lid when the lid and base are in the sealed arrangement. The flange tab includes an undercut release mechanism that allows a user to grasp a portion of the flange tab and initially open a sealed container via the extraction of the flange tab from the undercut formation by application of a pulling force to the undercut release mechanism. The flange tab includes tamper evident means that provides visible indication that the undercut release mechanism has been utilized to initially open the sealed container. A similar suggested tamper evident mechanism for food containers is that of U.S. Published Patent Application No. 20100224630 (Petlak). With this tamper evident mechanism, a pull tab extends outwardly from at least one of the base or the cover. The surface of the pull tab has a series of grooves such that when the tab is partially separated from the lid or base via a pulling force, the tab is supposed to curl. This curling is intended to provide a visible deformation, which would be a signal to an end user that the container has been opened. With the containers of Thaler and Petlak, the lid rim inserts into the base rim to seal the container and therefore the pull tab must be extracted from within the confines of the base rim. This requires a complicated tab structure, as well as a tab and base rim mating arrangement.
In view of the features and deficits of the prior art containers, there is thus a need in the art for a re-closable plastic food container that is easy for end consumers to operate; combines reliable tamper evidence and defense against prying intrusion; and that uses a minimum of material to manufacture.
The present invention satisfies the needs in the art and provides an aesthetically appealing food container that is easy to use and that is both tamper resistant and tamper evident. In this respect the present invention food container comprises a plastic food container having a lid adapted for tight sealing arrangement with a base. An embodiment plastic food container of the present invention is capable of assuming a loading state, an initially sealed state, a tab-employed state and an opened state. The embodiment plastic food container comprises a lid including a lid rim. The lid rim includes a lid rim flange. The embodiment container further includes a base that has a bottom and a base rim. A side wall extends upwardly from the bottom to the base rim. The side wall surrounds the bottom.
A lid rim is formed for sealing arrangement with the base rim. A projecting portion projects outwardly in general horizontal fashion from the lid rim flange. This projecting portion is preferably integrally formed in the lid rim flange. The projecting portion includes an accordiated section connected to a pull tab. The accordiated section comprises at least one pleat. The projecting portion also 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. The frangible bridge ruptures upon the application of a first pulling force to the pull tab when the container is in the initially sealed state. To ensure that the frangible bridge ruptures before the lid is removed from the base, the first pulling force is less than the pulling force required to separate the lid from the base. When the frangible bridge ruptures, the accordiated section has a second length visibly longer than the first length, thereby showing that the container's opening mechanism has been deployed.
In the preferred embodiment the at least one pleat comprises two legs. Each leg has a top and bottom. The two legs converge at their tops to meet at a peak. As is more fully described herein, there are a variety of locations at which to place the frangible bridge of the projecting portion. In one embodiment, the projecting portion includes a shoulder and the frangible bridge connects the at least one pleat to the shoulder. In another embodiment, the lid rim includes a peripherally projecting lid rim flange and the projecting portion includes a shoulder. The frangible bridge connects the shoulder to the lid rim flange. In a preferred embodiment, 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. In a further embodiment, wherein when the frangible bridge ruptures, the accordiated section has a second orientation.
The benefits of the inventive container can be achieved with a projecting portion having only one frangible bridge. However, for optimum balance and symmetry it is preferable that the projecting portion have a first frangible bridge and a second frangible bridge. The first frangible bridge and the second frangible bridge rupture 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 is less than a second pulling force required to separate the lid from the base. When the first frangible bridge and the second frangible bridge rupture, the accordiated section has a second length visibly longer than the first length. The invention is also directed to the projecting portion described above, which in the preferred embodiment has two frangible bridges connecting its shoulders to the flange of the lid rim.
Notably, in the loading or initially sealed container state, the accordiated section is in fixed position relative to the shoulders of the projecting portion. In this formation, the accordiated section has a first length. The accordiated section also preferably has a first orientation, which, again, for patency purposes is most noticeable when viewed relative to both the projecting portion and the base of the container. In particular, in a preferred embodiment, the bottom of the pleat legs of the accordiated section are flush with and aligned in the same plane as the projecting portion resulting in the accordiated section having a low angle upward deviation from the base. When the base includes a projecting platform disposed underneath the projecting portion, the proximity of the projecting platform provides another visual gauge by which to discern the orientation of the pull tab and accordiated section.
Furthermore, when the lid is sealed to the base to effect the initially sealed state, the lid rim and base rim tightly engage to seal the container. In terms of sealing arrangements, the inventive container is embodied in several versions in which the lid rim and base rim engagement structures vary. In one embodiment, the lid rim flange projects into an inner wall of the base rim and is protected from access. In another embodiment, the base rim has a base rim bead that includes a bead top segment as is known in the art. In the sealed state, the lid rim flange rests atop the bead top segment of the base rim. However, the top surface of the bead top segment includes an upwardly projecting guard bead that continuously surrounds the lid rim flange except for the portion at which the projecting portion on the lid rim flange projects horizontally outwardly such that the projecting portion can sit atop the base rim bead and be grasped by a user. In another embodiment, the bead top segment includes a base rim flange. In the initially sealed state, the lid flange superposes over the base rim. The lid rim is accessible, however, because the lid rim flange is very short (effectively ungraspable without use of a gripping tool like pliers) and the rims have a very tight engagement in which the short lid flange lies flush against the base rim, there is no way to grasp the lid except by the pull tab connected to the accordiated section.
In all embodiments, the first frangible bridge and the second frangible bridge are weakened sections of plastic and thus are designed to rupture upon the application of a pulling force to the gripping tip of the pull tab when the container is in the initially sealed state. Accordingly, because the only effective way to grasp the lid when it is sealingly engaged to the base is by the pull tab, pulling on the pull tab is the only way to separate the lid from the base. However, pulling on the pull tab will cause the frangible bridges to rupture, which allows the accordiated section to expand. As the accordiated section expands, it along with the pull tab angles upwards from its original position (if not blocked by structures by the base rim as in the first embodiment hereinafter described). As shown in the figures the pull tab and accordiated section are no longer fixed and thus angle upward. That upward angular change in position also represents a different orientation with the base. This visible expansion and upward orientation of the pull tab and accordiated section provides visible indication that the container has been opened.
In contrast to the containers of Thaler and Petlak, the pull tab of the present invention container is more easily graspable as it is not surrounded by base rim structure. Also, by having an accordiated section using pleats instead of simply having ribs or grooves formed in the surface of the tab structure, the pull tab not only bends upward and changes its orientation from its fixed position, but it extends in length from that fixed position. This provides a very patent indication of the container being opened.
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
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 wall 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.
In the context of the first embodiment container, an embodiment pull tab 40 of the present invention can be seen in
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.
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
In the embodiment shown in
As noted, projecting portion preferably includes two shoulders, first shoulder 7a and a second shoulder 7b. In the embodiment shown in
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 leg 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 the structures intended to separate (pleat 43 and riser 60 in the case of the embodiment shown in
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 in terms of visible difference. Plus, in terms of tactile feel, 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
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 50 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 50. 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.
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 have 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
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
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
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
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 101 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
As seen in
As shown
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
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.
In the context of container 201, the inventive pull tab 40 of the present invention is best seen in
The present invention container 201 includes projecting portion 6. Projecting portion 6 includes one or more shoulders 7a, 7b. The exemplary embodiment of
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.
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.
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.
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 and 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
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
Referable to
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.
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.
This application is a continuation of U.S. patent application Ser. No. 15/668,929 filed on Aug. 4, 2017, now U.S. Pat. No. 10,435,204. The entire contents of that application are incorporated herein by reference.
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| Number | Date | Country | |
|---|---|---|---|
| 20200031534 A1 | Jan 2020 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15668929 | Aug 2017 | US |
| Child | 16596256 | US |
