Tamper resistant seals for transparent or other egg cartons
A tamper proof seal for egg cartons that is particularly suitable for transparent egg cartons is described The seal is typically located on the side rims of the tray and lid. The seal is comprised of first contact area on the tray rim and a second contact area on the lid rim. The first and second contact areas are mechanically engaged or bonded together to form a sealed area between the lid and the tray that prevents the lid from being opened from the tray. A tear-away section on the tray and lid rim surrounds the sealed area. The tear-away section allows the sealed area to be easily removed from the egg carton by tearing-away the sealed area from the rim thereby allowing the egg carton to be opened.
This application is a continuation-in-part of U.S. Ser. No. 10/778,669 filed Feb. 11, 2004.
TECHNICAL FIELDThis invention relates to egg cartons, and more particularly a removable tamper resistant seal that can used with the egg cartons.
BACKGROUND OF THE INVENTIONConventional egg cartons in wide use today are typically made either of a fibrous material, such as cardboard, or a foamed polymeric material, such as foamed polystyrene (Styrofoam™). While these materials are inexpensive to prepare they share the same disadvantage of being opaque, requiring a consumer to open the lid of the egg carton to inspect the eggs for damage.
Egg cartons made of a transparent polymeric materials, such as poly ethylene terephthalate (PET) polymers have also come into use, although to a more limited extent than cardboard and foamed polystyrene cartons. Such transparent egg cartons exhibit various disadvantages that result from the properties of the materials used. For example, while these materials are recyclable, they are not biodegradable. In addition, most plastic materials, such as PET, have too much resiliency to easily operate as a crease type hinge between the lid of the carton and the tray that holds the eggs.
One method of solving the hinge problem with transparent egg cartons is illustrated in
Another problem with hinge junctions for egg cartons made of transparent plastics relates to difficulty in securely interlocking the lid onto the tray. In the typical cardboard or foamed polystyrene carton, a front flap is provided on the front of the tray and the flap also has a crease hinge along the junction between the flap and the tray. The flap contains two tabs positioned to fit into two holes formed in corresponding positions of the front surface of the lid, each positioned about ⅓rd the length of the flap from the edge. Because transparent polymeric materials tend to be relatively pliable, a full egg carton made with a flap and two tabs would tend to bend downwardly when grasped by the end, causing failure of the carton or premature release of the tabs from the lid. Moreover, because the resiliency of transparent polymeric materials is relatively large, a creased hinge for the flap has the same problems as a creased hinge for the lid.
One method to overcome this problem illustrated in
Another problem with resiliency in egg cartons made of transparent plastic materials is difficulty for a consumer to release the lid form the interlocking tabs and holes. In the cardboard or foamed polystyrene designs, the consumer typically pulls the front of the lid forward from the center to clear the holes from the tabs and rotates the lid upward to open the carton. However, if the flap and lid are made of typical transparent polymeric materials, which are more pliable than cardboard or foamed polystyrene, pulling the front surface of the lid forward from the middle creates a bow action that results in bowing of the middle of the flap outward and the lateral sides of the flap inward, making it difficult to release the lid from the button tabs on the flap. One method of overcoming this problem exemplified by U.S. Pat. No. 4,463,894 is to make the lateral portions of the flap thicker than the central portion to reduce the bowing effect. A problem with this design is that more material is required to form the flap.
One advantage of transparent egg cartons is that the consumer can inspect the eggs without opening the egg carton. Nonetheless, some consumers may be inclined to open the egg cartons merely out of habit. Repeated opening and closing of egg cartons, especially transparent egg cartons, inevitably leads to some percentage of cartons being improperly closed by some consumers. Some consumers may also be concerned that the eggs in the carton have not been tampered with post packaging. However, egg cartons of the prior art, unlike other food storage packages, are not sealed. Therefore, even upon opening the egg carton, the consumer cannot be guaranteed whether the egg carton had not been opened on a previous occasion.
Accordingly there is a need in the art to provide transparent egg cartons with a tamper resistant seal to provide assurances to the consumer that the egg carton has not been previously opened, and to thereby minimize the inclination to open the egg carton prior to purchase.
SUMMARY OF THE INVENTIONProvided herein are transparent egg cartons of improved design. In one aspect there is provided an egg carton that includes a tray with a plurality of egg compartments, a lid hingedly connected to the tray, and a closure flap hingedly connected to a front surface of the tray. In various embodiments, the tray, lid and flap are all made of a transparent polymeric material and at least one of the lid and flap are connected to the lid by either a “W” shaped hinge or a box hinge.
In another aspect there is provided an egg carton formed of a transparent polymeric material selected from the group consisting of a polylactic acid polymer, a poly glycolic acid polymer, and a polylactic-glycolic acid co-polymer. Polylactic acid is one of the preferred transparent materials. Use of these biodegradable materials is made possible by the various design features provided herein including any one, or preferably a combination of features that include: use of the “W” shaped hinge or box hinge, the provision of lattice struts in the flap, the provision of three button tabs in the flap with the lateral buttons being located about ⅛th the length of the flap from the edge, or the provision of vertical ribbing in the lid to provide additional mechanical strength to egg cartons made of these otherwise fragile materials.
In one exemplary embodiment, there is provided an egg carton made of polylactic acid and that includes: a tray having a lower portion defined by a plurality of egg compartments configured for receiving eggs, the tray having a tray front surface, a tray rear surface and tray end surfaces and an upper portion that defines a tray rim with a tray edge extending above the lower portion. Also included is a reversibly closeable lid configured to cover the tray when closed, the lid having a top surface, a lid front surface, a lid back surface and lid end surfaces, each of the front, back and end surfaces of the lid having a lower portion defining a lid rim with a lid edge. The lid is formed with vertical ribbing along its downwardly extending surfaces and has an undulated perimeter that provides additional strength to the lid by increasing the lineal footprint thereof. Also included is a flap rotatable along an axis parallel to the front surface of the tray, the flap having a rear edge connected to the tray, and a front edge opposite the rear edge and a width defined by a distance between the front and rear edges of the flap. The flap includes three tab buttons for interlocking with the lid, with the lateral tabs being located about ⅛th the length of the flap from the end. The flap also includes lattice struts to increase the lateral strength of the flap. A “W” shaped hinge or box hinge is used to connect the flap to the front surface of the tray and the lid to the back surface of the tray.
In a different aspect, there are provided tamper resistant seals for sealing an egg carton in a closed position. This aspect of the invention is suitable for egg cartons made of any material and is particularly suitable for egg cartons made of transparent material, which do not need to be opened to inspect the eggs.
In a general embodiment, this aspect provides egg cartons having a tray with a plurality of egg compartments and an upper portion defining a tray rim. A lid is hingedly connected to the tray to permit opening and closing of the lid over the tray, the lid having a lower portion defining a tray rim. The tray rim and the lid rim have corresponding first and second areas for contacting one another when the lid is closed. In a first condition, the first and second contact areas are engaged to form a sealed area between the lid and the tray that prevents the lid from being opened from the tray. The cartons also include a tear-away section on the tray rim and lid rim. The tear-away section is configured to disengage the sealed area from the lid and tray rims when the tear-away section is removed in a second condition that permits the lid to be opened from the tray.
In typical embodiments, the first and second contact areas are located on an end of the tray and lid rims, respectively. In particular embodiments, one of the first and second contact portions comprises a protrusion, the other of the first and second contact portions comprises a hole dimensioned to receive the protrusion. In these embodiments the seal includes a region where a top portion of the protrusion is expanded over a perimeter of the hole. Several embodiments of the protrusion are provided, including embodiments with various configurations of an upper portion of the protrusion to facilitate collapsing the protrusion over the perimeter of the hole.
In alternative embodiments, the first and second contact portions are sealably engaged by being bonded together. The bonding together of the first and second contact areas may be done by one or more of several techniques including having melted, glued, or co-solubilized the corresponding portions of the first and second contact areas.
With respect to the tear-away section, in typical embodiments the tear-away section on the tray rim and lid rim is defined by perforations through top and bottom surfaces of the tray and lid rims. The perforations at least partially surround the sealed area. Various exemplary embodiments of the tear-away section with perforations are provided.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following detailed description of exemplary embodiments of the invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown, by way of illustration, specific exemplary embodiments in which the invention may be practiced. In the drawings, like numerals describe substantially similar components throughout the several views. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. Other embodiments may be utilized and structural, logical and other changes may be made without departing from the spirit or scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims.
Described herein are various features for a transparent egg carton 10, which is suitable for embodiments using a variety of transparent polymeric materials, including, but not limited to relatively pliable recyclable polymeric materials such as polyethylene terephthalate (PET), which is an amorphous polyester; clarified polypropylene (CPP), which is polypropylene containing nucleating agents to increase clarity; styrene butadiene copolymers (SBC) without impact modifiers; copolymer blends of SBC with crystal polystyrene (cPS), which is commercially known as “K-Resin/Crystal™, oriented polystyrene (OPS); polyvinyl chloride (PVC); styrene acrylonitrile polymer (SAN); polymethyl methacrylate (PMM) and copolymers thereof, commercially known as plexiglass; and polycarbonate (PC). In advantageous embodiments, the features of the egg carton 10 are also suitable for a newer class of transparent polymeric materials that are recyclable and biodegradable. Examples of such polymeric materials include polylactic acid (PLA), polyglycolic acid (PGA) and polylactic acid-glycolic acid copolymers (PLGA). Until the present invention, such materials were not suitable for egg cartons because of their relatively low tensile strength and brittle properties. Surprisingly, however, in advantageous embodiments, the egg carton 10 is preferably made of PLA, PGA, or PLGA.
The egg compartments 7 have interiorly directed side ridges 2 that contact the eggs keeping them away from the interior side walls 6 of the egg compartment 7. The egg compartments 7 also have a lower platform ridge 5 that prevents the bottom of the eggs from contacting the interior surface of the bottom of the egg compartment 7. The side ridges 2 and bottom ridges 5 are typically shaped so that the exterior side of the ridges 2, 5 form a generally concave contour and the interior side of the ridges 2, 5 that contacts the egg have a generally convex contour. As illustrated in the cut-away front view of
Within the interior of the tray 12 a plurality of tower elements 17 are formed between the egg compartments 7 in such a way that an interior facing surface 19 of the towers 17 are continuous with the interior surfaces 6 of a plurality of the egg compartments 7 to support the upper portions of the eggs in adjacent compartments 7. The interior facing surfaces 19 of the towers 17 are separated by tower support ridges 15. The lower portion of the tower ridges 15 are interconnected or integral with the bracing elements 44 between the egg compartments 7. The towers 17 are made of a sufficient height so that an upper surface of the towers 17 contacts an interior side of the top surface 16 of the lid 14 when the lid 14 is closed, thereby providing additional mechanical support to prevent the egg carton 10 from being crushed from above, for example, when multiple cartons are stacked on one other after being filled with eggs.
Referring again to
In certain embodiments, such as depicted in
In certain other embodiments, such a depicted in
The lid 14 has a top surface 16, a front surface 18, a rear surface 20 opposing the front surface and opposing side surfaces 22, each of which extend downwardly from the from top surface 16. Three features of the lid 14 provide additional strength to the carton 10 to resist crushing when multiple cartons are stacked on one another, which is particularly advantageous for cartons made of pliable transparent materials. First, the front 18, rear 20 and side 22 surfaces of the lid 14 are heavily corrugated forming a plurality of parallel support ribs 21 separated by outwardly bulging areas 27 each extending vertically along the front 18, rear 20, and side 22 surfaces of the lid 14 between the top surface 16 and the lid rim 4. As illustrated in the top view of
Referring to
The lid 14 and the tray 12 may also constructed to form vents 25 when the egg carton 10 is closed. Eggs are typically packed into the egg carton 10 in a warm condition, then quickly moved to a refrigerated chamber to cool the eggs. This causes condensation to occur on the eggs if the egg carton 10 is not vented. Accordingly, the vents 25 are provided in the egg carton 10 to allow moisture to exhaust from the interior thereof. The vents 25 are formed by tray recesses 23 formed in the tray rim 3, which are correspondingly opposed to lid recesses 27 formed in the lid rim 4 so that the vent is formed when the lid 14 is closed.
Referring now to
These problems are addressed herein by providing at least three additional features to the flap 50. First, the flap 50 is formed with a plurality of lattice struts 54 that extend across the flap 50 from a point at, or adjacent to, a front edge 56 of the flap to a point at or near a rear edge 58 of the flap 50. The lattice struts 54 are comprised of a vertical portion 55 and a horizontal portion 57 transversely oriented to the vertical portion 55. The vertical portion 55 extends across at least about 75% or at least about 80% or at least about 90% the width of the flap 50 between the front edge 56 and the rear edge 58. In the advantageous design depicted in
A second feature of the flap 50 provided herein, which is contrary in principle to the design of egg cartons generally, is the provision of at least three button tabs 52a, 52b, and 52c rather than two as in conventional egg carton designs. The button tabs 52 are adapted to fit into corresponding button holes 65 formed in the front surface 18 of the lid 14 to lock the lid 14 into place over the tray 12. In certain embodiments not illustrated herein, the button holes 65 may be replaced by closed pockets configured with a shape that corresponds to the shape of the button tabs 52. As a general principle in egg carton design according to the prior art, it was desirable to use only two button tabs 52a and 52c disposed on lateral sides of the flap 50, because egg cartons with additional button tabs 52 such as centrally located button tab 52b would generally be more cumbersome to open. However, it has been discovered that when the egg carton is made of a pliable transparent polymeric material such as PET or PLA, a third, centrally located button tab 52b prevents the egg carton 10 from bending downward when held at the end. In addition and surprisingly, the third button 52b actually makes the lid 14 easier to open, especially when used in combination with the other features of the transparent egg carton 10 described herein.
A third feature of the flap 50 is the location of the most lateral buttons 52a and 52c. In conventional egg cartons using only two buttons, these are each placed about ⅓rd the length of the flap 50 from the edge. In the designs provided herein, the lateral buttons 52a and 52c are located at about 1/10th to ⅙th, and most advantageously, about ⅛th the length of the flap 50 from edge. This location of the lateral buttons increases the overall strength of the closed egg carton 10, helping to prevent the closed egg carton 10 from buckling when grasped from the end.
Another advantageous feature of the egg carton 10 is the use of a “W” shaped hinges 70 and/or box hinges 80 to connect the flap 50 and/or the lid 14 to the tray 12. Referring to Figures lOa and lOb, a “W” shaped hinge is characterized by having adjacent and symmetrical inner 72 and outer 74 depressions joined at an apex 75 defined by an apical junction where an outer wall 76 of the inner depression 72 meets an inner wall 78 of the outer depression 74 at an acute angle. When viewed from the end as depicted in
As illustrated in
The “W” shaped hinge 70 and box hinge 80 of the egg carton 10 provides a variety of advantages to egg cartons made from pliable and/or resilient transparent polymeric materials.. First, when the “W” shaped hinge is closed so that the walls of the derepressions 72, 74 meet at the obtuse angle, the walls of the inner depression 72 bear a portion of the weight of the attached lid 14 or flap 50. Second, the “W” shaped hinge and box hinge 80 are relatively easy to mold from a variety of transparent polymeric materials. Third, the “W” shaped hinge and box hinge 80 each extend outwardly from the from the front and rear surfaces of the rims 4, 11 of the lid 14 and the tray 12, respectively, which increases longitudinal rigidity of the egg carton 10. Fourth, these hinge types are suitable with transparent polymeric materials of different levels of pliability, such as PLA which is relatively more brittle and PET, which is relatively more pliable, because with these types of materials, the “W” shaped hinge 70 and box hinge 80 provide less resilience than a typical creased hinge of the prior art, making the carton 10 easier to open and close.
Another feature of the egg carton 10 is that the front surface 18 of the lid 14 along the lid rim 4 is formed with an awning portion 30 that extends outwardly from the front surface 18 of the lid rim 4. As illustrated in the detail of
Referring to
Also notable with respect to
Turning now to a different aspect of egg cartons depicted in
The various embodiments of the tamper proof seal include the tear-away section 210 that permits the sealed area 206 to be removed so that the lid 14 can be easily opened from the tray. The term “tear-away section,” as used herein means that an ordinary human hand using ordinary forces and typical motions can more easily break, tear, dislodge, disengage, disintegrate, detach, or otherwise remove one section of the carton (the tear-away section) than sections of the carton not configured with a tear-away section. It is understood of course, that given the range of human abilities and ingenuity, some persons may be able to break any section of the carton using ordinary forces and may be able to find a non-typical approach for using the same or a less amount of force to break other sections of the carton. The ability to use such atypical means or methods is an accepted principle, so the meaning of term includes designs where such atyptical means or methods could be used. To better understand the meaning by way of analogy, it is known that some food bags have a seal that closes the bag, and the bag contains specific regions designed to be more easily torn or more easily disengaged when pulled in a certain direction than other parts of the bag. The regions specifically designed to be more easily torn are analogous to the “tear-away regions” of the egg carton, despite the fact that a person could also open the bag from other places using more force or using a different technique.
In the exemplary embodiments depicted in
When initially formed, the outer most diameter of the protrusion 212 needs to be equal to or smaller than, the perimeter 218 of the hole so that the protrusion 212 can be inserted through the hole 214. To facilitate collapsing of the top portion 216 over the perimeter 218 to produce a diameter of the top portion 216 greater than the perimeter 218, it is useful to initially form the protrusion 212 with a top portion 216 having a greater lineal perimeter than the diameter of the hole 214. Turning to
In the embodiment pictured in
To temporarily reinforce the lower portion of the protrusion 212 and provide a surface for flattening the top portion 216, the egg packaging equipment may be configured to insert a suitably sized post having a flat surface through the bottom of the protrusion 212 to the points 213 and 215. The top surface of the post serves as an anvil surface while a hammer or other flat surface tool is used to apply a downward force over the top portion 216 of the protrusion, flattening it against the top surface of the post, thereby extending the upper portion 216 over the perimeter 218 ofthe hole 214.
Any of the foregoing embodiments may optionally be used with a hole 214 having a raised collar 217. In the embodiment depicted in
In alternative embodiments, the first and second contact portions 202, 204 of the sealed area 206 may be sealably engaged by being bonded together. The bonding together of the contact areas 202, 204 can be accomplished by several techniques, including, for example being melted, glued, or co-solubilized together. In one such embodiment depicted in
In other embodiments, neither the protrusion 212 nor the hole 214 nor the pit 228 need be used. Rather, as depicted in
The first and second contact areas 202, 204 are each surrounded by corresponding perforations 208, 209 or other easily broken border in the tray rim 11 and lid rim 4 extending horizontally across the surface of the rims and vertically down the edges thereof. These are depicted in plan view in
The perforations 208, 209 may be configured in a variety of geometries to make the tear-away section 210 easy to remove.
In the configuration illustrated in
The embodiments depicted in
It is further noted that while the tamper proof seal provided herein is particularly suitable for use with egg cartons made of transparent materials, and has been described in combination with such egg cartons 10, the tamper proof seal may also be adapted for use with opaque egg cartons where desired. All that is required is formation of the sealed area 206 within the contact areas 202, 204 between the lid 14 and tray 12 to prevent the lid from being easily opened, along with the formation of a tear-away section 210 to permit the sealed area 206 to be easily removed from the egg carton.
Although the foregoing describes particular combinations of features in particular embodiments, the features provided herein are useful in any of a variety of combinations that may include any of the disclosed features alone or in combination with any other of the disclosed features. Accordingly, what is provided herein can be practiced in many alternative embodiments. Therefore, from the foregoing it will be appreciated that, although specific embodiments of the invention have been described herein for purposes of illustration, various modifications may be made without deviating from the spirit and scope of the invention.
Claims
1. An egg carton comprising,
- a tray with a plurality of egg compartments and an upper portion defining a tray rim,
- a lid hingedly connected to the tray to permit opening and closing of the lid over the tray; the lid having a lower portion defining a lid rim,
- a first contact area on the tray rim and a corresponding second contact area on the lid rim, the first contact area and the second contact area being configured to be in contact with one another when the lid is closed over the tray, and where in a first condition the first and second contact areas include a sealed area between the lid and the tray that prevents the lid from being opened from the tray; and
- a tear-away section on the tray rim and lid rim, the tear-away section being configured to remove the sealed area from the lid and tray rims when the tear-away section is removed in a second condition that permits the lid to be opened from the tray.
2. The egg carton of claim 1 wherein the egg carton is made of transparent polymeric material.
3. The egg carton of claim 2 wherein the transparent polymeric material is selected from the group consisting of a polylactic acid polymer, a poly glycolic acid polymer, and a polylactic-glycolic acid co-polymer.
4. The egg carton of claim 25 wherein the material is polylactic acid.
5. The egg carton of claim 1 wherein the first and second contact areas are located on an end of the tray and lid rims, respectively.
6. The egg carton of claim 1 wherein one of the first and second contact portions comprises a protrusion, the other of the first and second contact portions comprises a hole dimensioned to receive the protrusion, and the seal comprises a region where a top portion of the protrusion is expanded over a perimeter of the hole.
7. The egg carton of claim 6 wherein the protrusion includes upper portion that fits into a perimeter of the hole, the upper portion configured to be collapsible over the hole to form a greater perimeter over the hole than when the upper portion is not collapsed over the hole.
8. The egg carton of claim 6 wherein the upper portion of the protrusion is domed shaped.
9. The egg carton of claim 6 wherein the upper portion of the protrusion is flanged relative to a lower portion of the protrusion.
10. The egg carton of claim 6 wherein a perimeter of the upper portion of the protrusion is fluted around a cylindrical cross section of the protrusion.
11. The egg carton of claim 6 wherein the upper portion of the protrusion includes flaps that are outwardly bendable over the perimeter of the hole.
12. The egg carton of claim 6 wherein the perimeter of the hole is raised to form a collar around the hole.
13. The egg carton of claim 1 wherein the first and second contact portions are sealably engaged by being bonded together.
14. The egg carton of claim 13 wherein the bonded together portions of the first and second contact areas includes at least one of a melted, glued, and a co-solubilized portion of the first and second contact areas.
15. The egg carton of claim 13 wherein the first and second contact portions have flat surfaces bonded in contact with one another in the first condition.
16. The egg carton of claim 1 wherein the tear-away section on the tray rim and the lid rim comprises perforations through the tray and lid rims and the perforations at least partially surround the sealed area.
17. The egg carton of claim 16 wherein the perforations are configured in lines that meet at a vertex positioned interior to an edge of the tray and lid rims and behind the sealed area.
18. The egg carton of claim 16 wherein the perforations are configured in lines positioned interior to an edge of the tray and lid rims, wherein a slot is formed through at least one of the tray and lid rims, and the lines of the perforations end at the slot.
19. The egg carton of claim 16 wherein the perforations are configured in at least a partially circular arrangement with a portion of the perforations being positioned interior to an edge of the tray and lid rims behind the sealed area.
20. The egg carton of claim 16, wherein at least one of the tray rim and the lid rim include a slot positioned interior to an edge of the tray and lid rims and behind the sealed area, and the other of the lid and tray rims includes a tab configured to fit through the slot, and wherein the perforations end at the slot.
21. The egg carton of claim 1 wherein the tear-away section is formed on the side ends of the tray and lid rims.
22. The egg carton of claim 1 further including a flap attached to the tray, the flap including at least three buttons configured to engage corresponding holes in the lid to reversibly nterlock the tray and the lid.
23. The egg carton of claim 22 wherein the flap includes lattice struts that include a vertical portion and a horizontal portion transversely oriented to the vertical portion within a plane of the flap.
24. The egg carton of claim 23 wherein the lattice struts form a triangular cross sectional area.
25. The egg carton of claim 23 wherein the lattice struts form at least one of a “W” shaped and a half “W” shaped planar cross section in the flap.
26. The egg carton of claim 25 wherein at least two of the “W” shaped and/or half “W” shaped cross section is positioned less than 0.5 inches from a button on the flap.
27. The egg carton of claim 1 further including a rear tower element located interiorly at a rear section of the tray, the tower element including a tab positioned at an apex of the tower element configured to fit into a corresponding hole positioned on the lid when the lid is closed over the tray.
28. The egg carton of claim 1 further including a plurality of towers located in the tray between a plurality of adjacent egg compartments, each of the plurality of towers having an interior surface contiguous with an interior surface of the adjacent egg compartments.
29. The egg carton of claim 28 further including a rear tower element located interiorly at a rear section of the tray, the tower element including a tab positioned at an apex of the tower element configured to fit into a corresponding hole positioned on the lid when the lid is closed over the tray.
30. The egg carton of claim 28 wherein the towers extend upward from a tray rim for a height sufficient to contact an interior surface of a top of the lid when the lid is closed over the tray.
31. The egg carton of claim 28 wherein the tray has a tray rim and a guide element located at a rear comer of the tray rim, interior to, and extending above the tray rim, and configured to guide an interior surface of a rear comer of the lid over an exterior surface of the guide element.
32. The egg carton of claim 1 wherein the lid is hingedly attached to the tray with “W” shaped hinge.
33. The egg carton of claim 28 wherein the lid is hingedly attached to the tray with “W” shaped hinge.
34. An egg carton comprising,
- a tray with a plurality of egg compartments,
- a lid hingedly connected to the tray with a “W” shaped hinge;
- a closure flap hingedly connected to a front surface of the tray; the tray, lid and flap being made of a transparent polymeric material, and the flap having at least three button tabs configured to fit into at least one of corresponding holes and corresponding pockets in a front surface of the lid when the lid is closed and interlocked with the flap;
- a first contact area on the tray rim and a corresponding second contact area on the lid rim, the first contact area and the second contact area being configured to be in contact with one another when the lid is closed over the tray, and where in a first condition the first and second contact areas include a sealed area between the lid and the tray that prevents the lid from being opened from the tray; and
- a tear-away section on the tray rim and lid rim, the tear-away section being configured to remove the sealed area from the lid and tray rims when the tear-away section is removed in a second condition that permits the lid to be opened from the tray.
Type: Application
Filed: Sep 7, 2004
Publication Date: Mar 23, 2006
Inventor: Craig Marshall (Upper Sandusky, OH)
Application Number: 10/936,154
International Classification: B65D 85/32 (20060101);