U.S. patent application number 12/420750 was filed with the patent office on 2010-10-14 for rotisserie chicken tray.
This patent application is currently assigned to PWPI Industries. Invention is credited to Francisco Diaz, Jose Enriquez.
Application Number | 20100258471 12/420750 |
Document ID | / |
Family ID | 42933496 |
Filed Date | 2010-10-14 |
United States Patent
Application |
20100258471 |
Kind Code |
A1 |
Enriquez; Jose ; et
al. |
October 14, 2010 |
ROTISSERIE CHICKEN TRAY
Abstract
A food container system can include a tray with a bottom and a
side wall, which together define a recess. The tray can have an
array of ribs on the bottom panel that can extend to the side wall.
The side wall can have female ribs that extend from the bottom
panel to the top edge of the side wall. An inverted corner creating
a concave shape on the exterior edge of the tray can be disposed at
the intersection of the bottom wall and the side wall. The tray can
include a rim that extends around the perimeter of the tray, which
can accept a complimentary surface of a lid.
Inventors: |
Enriquez; Jose; (South Gate,
CA) ; Diaz; Francisco; (Bellflower, CA) |
Correspondence
Address: |
KNOBBE MARTENS OLSON & BEAR LLP
2040 MAIN STREET, FOURTEENTH FLOOR
IRVINE
CA
92614
US
|
Assignee: |
PWPI Industries
Vernon
CA
|
Family ID: |
42933496 |
Appl. No.: |
12/420750 |
Filed: |
April 8, 2009 |
Current U.S.
Class: |
206/557 ;
220/608 |
Current CPC
Class: |
B65D 81/343 20130101;
B65D 21/0217 20130101; B65D 2401/10 20200501; B65D 1/44 20130101;
B65D 1/34 20130101 |
Class at
Publication: |
206/557 ;
220/608 |
International
Class: |
B65D 1/34 20060101
B65D001/34; B65D 8/04 20060101 B65D008/04 |
Claims
1. A tray for a food container, comprising: a bottom wall
comprising at least two first ribs disposed in a middle portion of
the bottom wall, each first rib comprising two parallel ridges
projecting a first distance above the bottom wall, separated by a
channel, at least one of the first ribs being disposed generally
parallel to a longitudinal axis of the tray and at least one of the
first ribs being disposed generally perpendicular to the
longitudinal axis of the tray; a side wall extending around the
periphery of the bottom wall and defining an interior of the tray;
an inverted corner disposed along the intersection of the bottom
wall and the side wall wherein the inverted corner is curved toward
the interior of the container, creating a concave edge on the
exterior surface of the tray; at least one second ribs comprising
two parallel ridges projecting a second distance above the bottom
wall, separated by a channel, disposed on an outer portion of the
bottom wall and the corner edge, extending from approximately an
edge of the middle portion of the bottom wall to the side wall.
2. The tray for a food container of claim 1, wherein the first ribs
form an array comprising of three first ribs disposed generally
parallel to a longitudinal axis of the tray and three first ribs
being disposed generally perpendicular to the longitudinal axis of
the tray.
3. The tray for a food container of claim 1, wherein the first
distance of the first ribs and the second distance of the second
ribs are substantially the same distance.
4. The tray for a food container of claim 1, further comprising at
least one cross-rib comprising two parallel ridges projecting a
third distance above the bottom wall, separated by a channel,
positioned within the ridges of the first ribs and generally
perpendicular to the first ribs within which it is positioned.
5. The tray for a food container of claim 4, wherein the first
distance of the first ribs and the third distance of the cross-ribs
are substantially the same distance.
6. The tray for a food container of claim 1, wherein at least one
of the channels of the first ribs or second ribs is a U-shaped
channel.
7. The tray for a food container of claim 1, further comprising at
least one first depression projecting a fourth distance below the
bottom wall.
8. The tray for a food container of claim 7, further comprising at
least one second depression projecting from the first depressions
to a fifth distance below the bottom wall.
9. The tray for a food container of claim 7, further comprising at
least one third rib projecting above the bottom wall and disposed
adjacent the peripheral corners of the first depressions.
10. The tray for a food container of claim 8, wherein the fifth
distance of the second depression is greater than the fourth
distance of the first depression.
11. The tray for a food container of claim 1, further comprising at
least one first female rib upwardly extending from the outer
portion of the bottom wall to a top edge of the side wall, each of
the first female ribs including at least one second female rib
formed in the side wall disposed within the upper portion of the
first female ribs.
12. The tray for a food container of claim 1, further comprising at
least one third female rib that comprises at least one channel
upwardly extending along the side wall from an end of the second
ribs to a top edge of the side wall.
13. The tray for a food container of claim 1, further comprising at
least one fourth female rib upwardly extending along the side wall
disposed within the upper portion of the side wall.
14. The tray for a food container of claim 1, further comprising an
outward extending flange disposed around the periphery of a top
edge of the side wall, wherein the flange surface is generally
parallel to the bottom wall.
15. The tray for a food container of claim 14, the extending flange
further comprising an abutment surface positioned to couple with a
complimentary abutment surface of a cover piece to form a snap fit
in a closed position.
16. A tray for a food container, comprising: a bottom wall
comprising at least two ribs disposed in a middle portion of the
bottom wall, each rib comprising two parallel ridges projecting a
first distance above the bottom wall, separated by a channel, at
least one of the ribs being disposed generally parallel to a
longitudinal axis of the tray and at least one of the ribs being
disposed generally perpendicular to the longitudinal axis of the
tray; a side wall extending around the periphery of the bottom wall
and defining an interior of the tray.
17. The tray for a food container of claim 16, wherein the ribs
form an array comprising of three ribs disposed generally parallel
to a longitudinal axis of the tray and three ribs being disposed
generally perpendicular to the longitudinal axis of the tray.
18. The tray for a food container of claim 16, further comprising
at least one cross-rib comprising two parallel ridges projecting a
second distance above the bottom wall, separated by a channel,
positioned within the ridges of the ribs and generally
perpendicular to the ribs within which it is positioned.
19. The tray for a food container of claim 18, wherein the first
distance of the ribs and the second distance of the cross-ribs are
substantially the same distance.
20. The tray for a food container of claim 16, wherein at least one
of the channels is a U-shaped channel.
21. The tray for a food container of claim 16, further comprising
at least one first depression projecting a third distance below the
bottom wall.
22. The tray for a food container of claim 21, further comprising
at least one second depression projecting from the first
depressions to a fourth distance below the bottom wall.
23. The tray for a food container of claim 21, further comprising
at least one rib projecting a fifth distance above the bottom wall
and disposed adjacent the peripheral corners of the first
depressions.
24. The tray for a food container of claim 22, wherein the fourth
distance of the second depression is greater than the third
distance of the first depression.
25. The tray for a food container of claim 16, further comprising
at least one first female rib upwardly extending from the outer
portion of the bottom wall to a top edge of the side wall, each of
the first female ribs including at least one second female rib
formed in the side wall disposed within the upper portion of the
first female ribs.
26. The tray for a food container of claim 16, further comprising
at least one third female rib upwardly extending along the side
wall disposed within the upper portion of the side wall.
27. The tray for a food container of claim 16, further comprising
an outward extending flange disposed around the periphery of a top
edge of the side wall, wherein the flange surface is generally
parallel to the bottom wall.
28. The tray for a food container of claim 27, the extending flange
further comprising an abutment surface positioned to couple with a
complimentary abutment surface of a cover piece to form a snap fit
in a closed position.
29. A tray for a food container, comprising: a bottom wall; a side
wall extending around the periphery of the bottom wall and defining
an interior of the tray; at least one rib comprising two parallel
ridges projecting a distance above the bottom wall, separated by a
channel, disposed on an outer portion of the bottom wall, extending
from approximately an edge of a middle portion of the bottom wall
to the side wall.
30. The tray for a food container of claim 29, further comprising
at least one channel upwardly extending along the side wall from an
end of the ribs to a top edge of the side wall.
31. The tray for a food container of claim 29, further comprising
an outward extending flange disposed around the periphery of a top
edge of the side wall, wherein the flange surface is generally
parallel to the bottom wall.
32. The tray for a food container of claim 31, the extending flange
further comprising an abutment surface positioned to couple with a
complimentary abutment surface of a cover piece to form a snap fit
in a closed position.
Description
FIELD OF THE INVENTION
[0001] The disclosure relates to food packaging and more
specifically to plastic food trays that can be subjected to
elevated temperatures.
BACKGROUND
[0002] In an attempt to provide an appealing display package and
transport container for heated foods, such as rotisserie chicken,
food processors have turned to rigid plastic containers. Usually,
the containers have an opaque tray and a transparent lid
thermoformed from plastic material. The purpose of the tray is to
hold the food product and provide a sturdy support for transporting
the food product from the store. The transparent lid allows food
processors to attract consumers by presenting an appealing product
on the store shelves. Consumers can also judge the freshness and
visual appeal of the product through the transparent lid. The
assembly of the tray and the lid is also important in insulating
the heated food product and retaining the stored heat for an
extended period of time. Also, the assembly aids in keeping the
contents, such as juices, from spilling onto surrounding areas.
[0003] One disadvantage of previous rigid plastic container designs
is that the plastic loses its rigidity when heated by the heated
food contents. The elevated temperature of the food will heat and
soften the plastic making the tray more prone to bending when
lifted or carried by gripping a first end or a second end or the
corners of the tray. This is especially problematic for the tray of
the container, which supports the weight of the heated food
contents. The combination of heat and weight from the heated food
contents can lead to deformation of the container, causing the seal
between the tray and the lid to separate and possibly result in the
spilling of the contents of the container.
[0004] In order to meet this challenge, food processors have tried
several solutions. One solution was to increase the thickness of
the plastic material for greater strength and rigidity. However,
this solution was undesirable because of the increased packaging
costs and the negative environmental consequences of increasing the
material content for a disposable container. Another solution was
the use of more rigid material, such as aluminum. This solution
also had disadvantages because of the increased cost and weight of
the aluminum trays.
[0005] Some solutions have been to include ribs in the tray to
provide more strength and rigidity to the surfaces of the tray.
Planar surfaces are prone to bending and so flat surfaces are the
weakest part of the tray. Ribs aid to reinforce the surfaces of the
tray because the curves of the rib structures resist bending of the
plastic along a transverse axis of the rib.
[0006] One attempt at a rib structure that provides strength and
rigidity to a container while minimizing the thickness of the
material required is disclosed in U.S. Pat. No. 6,619,501, issued
Sep. 16, 2003, to Hayes et al., which is incorporated by reference
in its entirety. This patent discloses a rib pattern with
longitudinal ribs in the center of the bottom surface of the tray,
with transverse ribs at different angles interconnecting the
longitudinal ribs. The patent also discloses ribs and depressions
extending up the walls of the tray. Another tray structure is
disclosed within U.S. Pat. App. No. 2007/0196541, published Aug.
23, 2007, to Vovan et al., which is also incorporated by reference
in its entirety. This patent application discloses a bottom surface
of the tray comprising an array of diamond shaped protrusions at
the center and two elongate rib structures along the outer
perimeter of the bottom surface. The patent also discloses closely
positioned depressions along the walls of the tray.
SUMMARY OF THE DISCLOSURE
[0007] An aspect of at least one of the embodiments disclosed
herein includes the realization that a there is a need for a rigid,
cost-effective packaging system that provides a sturdy container
for the display and transport of heated food products. Also, there
is a desire to reduce the negative impact on the environment by
minimizing the amount of material that is used for the disposable
container, while still providing enough material stiffness to
prevent the container from excessively bending under the heat and
load of the food product. The present invention provides unique
approaches that achieve these objectives.
[0008] Thus, in accordance with at least one of the embodiments
disclosed herein, a tray for a food container is disclosed. The
tray can comprise a bottom wall with at least two first ribs
disposed in a middle portion of the bottom wall. Each first rib can
comprise two parallel ridges projecting a first distance above the
bottom wall and separated by a channel. At least one of the first
ribs can be disposed generally parallel to a longitudinal axis of
the tray and at least one of the first ribs can be disposed
generally perpendicular to the longitudinal axis of the tray. A
side wall can extend around the periphery of the bottom wall and
define an interior of the tray. In some embodiments, an inverted
corner can be disposed along the intersection of the bottom wall
and the side wall, wherein the inverted corner is curved toward the
interior of the container creating a concave edge on the exterior
surface of the tray. At least one second rib comprising two
parallel ridges can project a second distance above the bottom wall
and can be separated by a channel. The second rib can be disposed
on an outer portion of the bottom wall and the corner edge,
extending from approximately an edge of the middle portion of the
bottom wall to the side wall.
[0009] In some embodiments, a tray for a food container is
disclosed that can comprise a bottom wall comprising at least two
ribs disposed in a middle portion of the bottom wall. Each rib can
comprise two parallel ridges projecting a first distance above the
bottom wall. In some embodiments, the rib can be separated by a
channel. At least one of the ribs can be disposed generally
parallel to a longitudinal axis of the tray and at least one of the
ribs can be disposed generally perpendicular to the longitudinal
axis of the tray. A side wall can extend around the periphery of
the bottom wall and define an interior of the tray.
[0010] Some embodiments of a tray for a food container can have a
bottom wall and a side wall extending around the periphery of the
bottom wall that can define an interior of the tray. An inverted
corner can be disposed along the intersection of the bottom wall
and the side wall wherein the inverted corner can be curved toward
the interior of the container, creating a concave edge on the
exterior surface of the tray.
[0011] In some embodiments, a tray for a food container can
comprise a bottom wall and a side wall extending around the
periphery of the bottom wall that can define an interior of the
tray. At least one rib can comprise two parallel ridges projecting
a distance above the bottom wall and can be separated by a channel.
The rib can be disposed on an outer portion of the bottom wall,
extending from approximately an edge of a middle portion of the
bottom wall to the side wall.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The following drawings and the associated descriptions are
provided to illustrate particular embodiments of the present
disclosure and do not limit the scope of the claims.
[0013] FIG. 1 illustrates an isometric perspective view of an
embodiment of the food tray.
[0014] FIG. 2 illustrates a top plan view of the food tray of FIG.
1 showing the different portions of the bottom.
[0015] FIG. 3 illustrates a top plan view of the food tray of FIG.
1.
[0016] FIG. 4 illustrates a side cross-sectional view of the food
tray of FIG. 3 at A-A.
[0017] FIG. 4A illustrates an enlarged cross-sectional view of the
food tray of FIG. 4 at detail C.
[0018] FIG. 5 illustrates a side cross-sectional view of the food
tray of FIG. 3 at B-B.
[0019] FIG. 5A illustrates an enlarged cross-sectional view of the
food tray of FIG. 5 at detail D.
[0020] FIG. 6 illustrates an enlarged cross-sectional view of the
food tray of FIG. 5 at detail E.
[0021] FIG. 7 illustrates an enlarged isometric perspective view of
a portion of the food tray of FIG. 1.
[0022] FIG. 8 illustrates an enlarged top plan view of a portion of
the food tray of FIG. 3.
[0023] FIG. 9 illustrates a front elevation view of the food tray
of FIG. 1.
[0024] FIG. 10 illustrates a side elevation view of the food tray
of FIG. 1.
[0025] FIG. 11 illustrates a bottom isometric perspective view of
the food tray of FIG. 1.
[0026] FIG. 12 illustrates a bottom plan view of the food tray of
FIG. 1.
DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS
[0027] The following description and examples illustrate
embodiments of a food tray. The food tray is disclosed in the
context of use with various food products, such as for example
rotisserie chicken. The principles of the present invention,
however, are not limited to rotisserie chicken or food products in
general. The food tray described can be used with other types of
goods, including, but not limited to: baked goods, fruits, chips,
haberdashery, fasteners, and the like. Additional applications for
the devices and systems are disclosed herein. Thus, the
illustrations and descriptions of the food tray in connection with
the rotisserie chicken are merely exemplary of some possible
applications of the food tray.
[0028] To assist in the description of these components, the
following coordinate terms are used. FIG. 1 depicts an x-y-z
Cartesian coordinate system, with the container system primarily
lying in the x-y plane. As described herein, terms such as "height"
refer to distance in the z-direction, and "higher/upward" and
"lower/downward" refer to the positive and negative z-direction,
respectively. Similarly, terms such as "outer" and "inner"
generally refer to directions in the x-y plane directed generally
away from or toward the center of the container system,
respectively. Similarly, terms such as "lateral" will refer to the
x-direction and "longitudinal" will refer to the y-direction. A
detailed description of an embodiment of the container system, and
its associated method of use, now follows.
[0029] Referring initially to FIG. 1, the tray 100 can include a
bottom 200 and a side wall 300 that extends around the entire
periphery of the bottom 200 and extends from the bottom 200 to a
rim 400. The tray 100 can be generally rectangular, but it will be
clear from the description herein that the tray 100 can comprise
other shapes including circles, trapezoids, rhombuses, pyramids,
ovals, and other shapes. As illustrated in the embodiment depicted
in FIG. 3, the tray 100 can have a generally rectangular shape with
a fifth side 101 that intersects a corner of the rectangle. The
tray 100 can be thermoformed plastic and can be covered with a lid
if desired. The tray 100 can be sufficiently thick to provide
enough rigidity to support the product contained inside, but the
thickness can be minimized so as not to produce excessive waste. In
some embodiments, the thickness can include a range from 0.015
inches to 0.125 inches. In other embodiments, the thickness can be
outside of the specified range. The tray 100 can be configured to
carry foods and hot food such as rotisserie chicken. The tray 100
can be strengthened to avoid or substantially avoid bending by
including a pattern or array of ribs and rib units of multiple
angles and multiple depths such that the tray 100 does not have a
straight path of bending.
[0030] In some embodiments, the bottom 200 of the tray 100 can
include five different levels and a pattern or array of ribs on the
bottom 200. The pattern or array of alternating levels and ribs can
prevent bending of the bottom 200. The bottom 200, with its pattern
or array of ribs, can provide an increase in strength of the tray
100 when supported or held while a force is loaded on the bottom
200.
[0031] As illustrated in FIGS. 3 and 4, the bottom 200 can include
a bottom wall 201 which defines one of six different levels or
heights in the bottom 200. The bottom wall 201 defines the first
level and comprises an inner portion 202 at the center of the
bottom wall 201 and an outer portion 203 that circumscribes the
inner portion 202. FIG. 2 illustrates generally the inner portion
202 shaded in a diamond pattern and generally the outer portion 203
shaded in a dotted pattern. A second level is defined by at least
two first bottom ribs 210 formed in the bottom 200. As illustrated
in FIGS. 4 and 4A, the first bottom ribs 210 can comprise at least
two substantially parallel ridges 211 projecting a first distance
above the bottom wall 201. A third level is defined by at least one
second bottom rib 220 formed on the bottom 200. As illustrated in
FIGS. 7 and 8, each second bottom rib 220 can comprise two parallel
ridges 221 projecting a second distance above the bottom wall 201,
separated by a channel 222. The second bottom rib 220 can be
disposed on an outer portion 203 of the bottom wall 201, extending
from an edge 204 of the inner portion 202 of the bottom wall 201
and along the contour of the inverted corner 500 to the side wall
300. In some embodiments, a plurality of cross-ribs 230 projecting
a third distance above the bottom wall 201 can be positioned in
between the first bottom ribs 210. A fourth level is defined by a
plurality of first depressions 240 formed in the bottom wall 201
and between the first bottom ribs 210, as illustrated in FIGS. 3, 4
and 4A. A fifth level is defined by a plurality of second
depressions 250 formed in the first depressions 240. A sixth level
is defined by at least one third bottom rib 260 projecting a sixth
distance above the bottom wall 201 and disposed approximate the
corners of the bottom wall 201.
[0032] In an embodiment illustrated in FIGS. 4 and 4A, the first
bottom ribs 210 can comprise two substantially parallel ridges 211
projecting a first distance above the bottom wall 201. In other
embodiments, the ribs may comprise more than two ridges, such as
for example three or four ridges. The parallel ridges 211 can be
separated by a channel 212 with a U-shaped bottom. At least one of
the first ribs can be disposed generally parallel to a longitudinal
axis 600 of the tray 100 and at least one of the first bottom ribs
210 can be disposed generally perpendicular to the longitudinal
axis 600 of the tray 100. In an embodiment illustrated in FIG. 3,
the tray 100 comprises three first bottom ribs 210 generally
parallel to the longitudinal axis 600 and three first bottom ribs
210 generally perpendicular to the longitudinal axis 600. This can
create an array of crossing ribs that can resist bending of the
tray 100 in multiple directions. In other embodiments, the tray 100
can comprise any number of first bottom ribs 210 in the generally
longitudinal direction and any number of first bottom ribs 210 that
can be generally perpendicular to the longitudinal axis 600. In
some embodiments, the first bottom ribs 210 can be at an oblique
angle to the longitudinal axis 600. For example, the first bottom
ribs 210 can extend at an angle to the longitudinal axis 600 that
is between 0 to 90 degrees. In some embodiments, the first bottom
ribs 210 can have a curvilinear shape or comprise angles along the
longitudinal length of the ribs. The first bottom ribs 210 extend
across the inner portion 202 of the bottom wall 201 from one edge
204 of the inner portion 202 to another edge 204 of the inner
portion 202.
[0033] FIG. 4 is a cross-section of the tray 100 taken along line
A-A in FIG. 3, which illustrates the shapes and heights of the
bottom wall 201, first bottom ribs 210, first depressions 240 and
second depressions 250. As illustrated in the detail view of FIG.
4A, the ridges 211 of the first bottom ribs 210 can be narrow and
can have generally vertical side walls 213. The first bottom ribs
210 can have a generally "M" shape. In some embodiments, the curved
channel 212 has a semicircular cross section, as illustrated in
FIG. 4A. In some embodiments, the depth of the channel 212 below
the top of the ridges 211 can be less than the height of the ridges
211.
[0034] Referring to FIG. 3, the tray 100 can comprise at least one
second bottom rib 220 disposed on the outer portion 203 of the
bottom wall 201. As illustrated in FIGS. 7 and 8, the second bottom
ribs 220 can be double ribs similar to the first bottom ribs 210.
The two parallel ridges 221 of the second bottom ribs 220 can
project a second distance above the bottom wall 201 and can be
separated by a channel 222. In some embodiments, the channel 222 is
a U-shaped channel. The second bottom ribs 220 are generally
disposed on an outer portion 203 of the bottom wall 201 and can
extend generally from an edge 204 of the inner portion 202 of the
bottom wall 201 to the side wall 300, as can be seen in FIG. 3. In
some embodiments, the second bottom ribs 220 can extend from the
end of the first bottom ribs 210 to the side wall 300 and/or extend
from the edge of the first depression 240 to the side wall 300. In
the embodiment illustrated in FIG. 7, the second bottom ribs 220
follow the contour of the inverted corner 500. In other
embodiments, the second bottom ribs 220 may extend to the side wall
300 without following the contour of the inverted corner 500.
[0035] FIG. 5 is a cross-section of the tray 100 taken along the
centerline of one of the first bottom ribs 210, as illustrated by
line B-B in FIG. 3. FIG. 5 illustrates the depth of the channels
212 between the first bottom ribs 210 and also illustrates the
plurality of cross-ribs 230. The cross-ribs 230 can comprise two
parallel ridges 231 projecting a third distance above the bottom
wall 201, separated by a channel 232 and positioned within the
ridges 211 of the first bottom ribs 210, as illustrated in FIG. 5A.
In some embodiments, the channel 232 between the ridges 231 can be
a rounded bottom channel. In some embodiments, the cross-ribs 230
are generally perpendicular to the first bottom ribs 210 within
which they are positioned. In other embodiments, the cross-ribs 230
are disposed at an angle between 0 degrees to 180 degrees relative
to the first bottom ribs 210 within which they are positioned. In
some embodiments, the depth of the channels 232 of the cross-ribs
230 can be substantially the same as the depth of the channels 212
of the first bottom ribs 210 and the height of the cross-ribs 230
can be substantially the same as the height of the first bottom
ribs 210, as illustrated in the detail view of FIG. 5A. In other
embodiments, the depth of the channels 232 of the cross-ribs 230
can be less than or greater than the depth of the channels 212 of
the first bottom ribs 210. The height of the cross-ribs 230 can be
higher or lower than the height of the first bottom ribs 210.
[0036] In some embodiments, as illustrated in FIG. 3, a plurality
of first depressions 240 can be disposed in the inner portion 202
of the bottom wall 201, including the areas between the first
bottom ribs 210. The first depressions 240 can be at a fourth
distance below the bottom wall 201. In some embodiments, the first
depression 240 can be one depression disposed in the inner portion
202 of the bottom wall 201 and can have a perimeter shape that
generally corresponds to the perimeter shape of the tray 100.
[0037] Also illustrated in FIG. 3, a plurality of second
depressions 250 can be disposed in the first depression 240 and can
project a fifth distance below the bottom wall 201. The second
depressions 250 can be deeper than the first depressions 240. In
some embodiments, the second depressions 250 can have shapes that
are for example, but not limited to, triangular, rectangular,
circular, or oval.
[0038] The depressions 240, 250 form angles in the tray 100 that
can resist bending in multiple directions. The depressions 240, 250
of the tray 100 can reduce sliding among multiple stacked
containers. For example, the depressions 240, 250 in the tray 100
can extend downward such that they can generally extend into and
match the upper grooves created by the curved walls of a lid when a
tray 100 is stacked on top of a lid.
[0039] The bottom wall 201 can comprise at least one third bottom
rib 260 projecting a fourth distance above the bottom wall 201 and
disposed approximate the edge 204 of the inner portion 202 of the
bottom wall 201. An embodiment of a third bottom rib 260 is
illustrated in FIG. 3. In some embodiments, the third bottom rib
260 can be curved segments disposed approximately around the corner
perimeters of the first depression 240. In some embodiments, these
curved ribs projecting above the bottom wall 201 can create
depressions 261 on the outer bottom surface of the tray 100, as
illustrated in FIG. 11, which can accept complimentary projection
on the lid for resisting lateral movement of a tray 100 stacked on
top of a lid. The third bottom ribs 260 can be of sufficient width
to accommodate the complimentary projections.
[0040] The corner defined by the junction of the bottom 200 and
side walls 300 can be inverted so that the corner is convex instead
of concave when viewing the inner surfaces of the tray 100, as
illustrated in FIG. 1. The inverted corner 500 strengthens the tray
100 against bending by providing angles. In some embodiments, the
inverted corner 500 runs along the entire length of the junction
between the bottom 200 and the side walls 300. In other
embodiments, the inverted corner 500 is disposed on some portions
of the junction between the bottom 200 and the side walls 300.
[0041] The features of the bottom 200 and side walls 300 that are
disposed at the corner can follow the contour of the inverted
corner 500 so that the features have a generally convex shape as
well. For example, the second bottom ribs 220 can have a convex
shape at the corner region, which is best illustrated in FIG.
1.
[0042] The side wall 300 includes a pattern of one or more ribs
that provide multiple angles and depths to the side wall 300. Some
embodiments of rib units described herein are from the perspective
looking at the interior surfaces of the tray 100 and are
illustrated in FIGS. 7 and 8. A first rib unit 310 can be
thermoformed into the tray 100 and can include a first female rib
311 and a second female rib 316 formed in the first female rib 311.
The first female rib 310 can extend from adjacent the rim 400 to
the outer portion 203 of the bottom wall 201. The second female rib
316 can be shorter than the first female rib 311 and can extend
from adjacent the rim 400 to approximately the inverted corner
500.
[0043] The first female rib 311 can comprise a first section 312
that extends from adjacent the rim 400 to the inverted corner 500.
The first section 312 can be tapered and can be wider at the end
adjacent the rim 400 than the end adjacent the inverted corner 500,
so that the first section 312 has generally a V-shape, as best
illustrated in FIG. 9. In some embodiments, the first section 312
can have a uniform width or some other shape. Returning to FIG. 7,
the second section 313 can be a female rib formed on the inverted
corner 500. In some embodiments, the second section 313 can have a
uniform width. In other embodiments, the second section 313 can be
tapered wherein one end can be wider than the other end. The third
section 314 of the first female rib 311 can be an elongate female
rib disposed on the outer portion 203 of the bottom wall 201. Some
of the third sections 314 can be positioned between the second
bottom ribs 220. In some embodiments, the third section 314 can
have a uniform width. In some embodiments, the depth of the third
section 314 can be tapered, so that it creates a V-shaped channel
315 along the outer portion 203 of the bottom wall 201.
[0044] The end of the third section 314 can extend to approximately
the edge 204 of the inner portion 202 of the bottom wall 201. In
some embodiments, the length of the third section 314 can vary
depending on the location where the first female rib 311 is
disposed. For example, the third section 314 of the first female
ribs 311 on the corners of the tray 100 can have third sections 314
that are shorter in length than the third sections 314 of first
female ribs 311 along the sides of the tray 1 00, to avoid overlap
of the first female ribs 311. The varying length of the third
sections 314 is best illustrated in FIG. 3.
[0045] The second female rib 316 can be disposed substantially
along the centerline of the first female rib 311 and can extend
from adjacent the rim 400 to approximately the inverted corner 500,
as illustrated in FIG. 7. The second female rib 316 can have a
width at the rim 400 end and can taper inward as it extends down
toward the inverted corner 500, so that its sides intersect at
approximately adjacent the inverted corner 500. In some
embodiments, the sides of the second female rib 316 can converge
toward the end adjacent the inverted corner 500 without
intersecting. In some embodiments, the depth of the second female
rib 316 can also vary along the length of the second female rib
316. In some embodiments, the second female rib 316 can be deepest
toward the end adjacent the rim 400 and can taper so that the
second female rib 316 can be flush with the first female rib 311
toward the end adjacent the inverted corner 500. In other
embodiments, the depth of the second female rib 316 can be
generally constant along the length of the second female rib
316.
[0046] The first rib unit 310 also strengthens the side wall 300
against bending by providing multiple angles. As illustrated in
FIG. 4, the first rib unit 310 can be at an angle A to a vertical
line 340 that is perpendicular to the bottom 200. In some
embodiments, the range for angle A can include angles from about
5.degree. to about 45.degree.. The first rib unit 310 can be
repeated around the entire side wall 300 to form a pattern. The
first rib units 310 can be positioned adjacent to each other or
spaced apart with portions of the side wall 300 between first rib
units 310.
[0047] With reference to FIG. 7, in some embodiments, additional
depths and angles can be provided in the side wall 300 by a second
rib unit 320 thermoformed in the side wall 300. The second rib unit
320 can include a third female rib 321 that can extend from
adjacent the rim 400 to the inverted corner 500. In some
embodiments, the third female rib 321 can be an extension of the
curved channel 222 of the second bottom ribs 220 that may extend to
the side wall 300. The third female rib 321 can have a depth that
is generally the same as the depth of the channel 222 of the second
bottom ribs 220. In other embodiments, the depth of the third
female rib 321 can be variable and/or can have a depth that is
different from the depth of the channel 222 of the second bottom
ribs 220. In some embodiments, the third female ribs 321 have a
uniform width along the length of the rib. In other embodiments,
the width of the third female ribs 321 can be variable. For
example, the third female ribs 321 can have a width on the end
adjacent the inverted corner 500 that is substantially the same as
the width of the channel 222 of the second bottom ribs 220, but
then can converge as it extends up to the end adjacent the rim
400.
[0048] To provide angles to the tray 100, the second rib unit 320
can be at an angle B to the vertical line 340, as illustrated in
FIG. 5. In some embodiments, angle B can include angles from about
5.degree. to about 45.degree.. In some embodiments, the angle A can
be different from angle B, contributing to the multiple depth
characteristic of a rib pattern that can include both the first rib
units 310 and the second rib units 320. The different angles A and
B can add to the strengthening effect of the rib units and can
contribute to avoiding a straight line of bending in the tray.
[0049] A third rib unit 330 can be thermoformed in the side wall
300 to provide additional strength and rigidity to the tray 100. In
some embodiments, the third rib unit 330 can be similar to the
second rib units 320, but disposed on the side wall 300 where the
second bottom ribs 220 do not extend. For example, in some
embodiments, the third rib unit 330 can be disposed on the corners
of the side wall 300. The third rib unit 330 can comprise a fourth
female rib 331 that can extend from adjacent the rim 400 to
adjacent the inverted corner 500. The fourth female rib 331 can
have a width at end adjacent the rim 400 and can converge inward as
it extends down toward the inverted corner 500, so that it
intersects approximate to the end adjacent the inverted corner 500.
In some embodiments, the sides of the fourth female rib 331 can
converge toward the end adjacent the inverted corner 500 without
intersecting. In some embodiments, the fourth female ribs 331 have
a uniform width along the length of the rib. In some embodiments,
the depth of the fourth female rib 331 can also vary along the
length of the rib. For example, the fourth female rib 331 can be
deepest toward the end adjacent the rim 400 and can taper so that
the fourth female rib 331 is flush with the surface of the third
rib unit 330 toward the end adjacent the inverted corner 500.
[0050] A multiple angle, multiple depth rib unit pattern can
include alternating the first rib units 310 and the second rib
units 320 or may include any combination of first rib units 310,
second rib units 320 and third rib units 330. Some embodiments may
include only one or two types of rib units. By providing such
ribbing in multiple directions, bending of the tray 100 can be
resisted in multiple directions, including lateral, longitudinal,
and diagonal directions.
[0051] With reference to FIG. 6, in some embodiments, the tray 100
can have a rim 400 extending outwardly from the top edge 401 of the
tray 100 and can comprise a structure that is complimentary to a
structure on an optional lid. The lid and tray 100 can attach along
their respective rims, which can extend generally along the
perimeter of the lid and tray 100.
[0052] Corresponding to the attachment structures along the sides
of the tray 100, the tray 100 can include an elongate snap ridge
402 disposed along the rim 400 of the tray 100 for fitting into a
complimentary groove on a lid. These features are best depicted in
FIG. 6. The snap ridge 402 can comprise a protrusion 403 along the
side of the snap ridge 402 that fits in a hollow on a complimentary
groove of the lid. The attachment can be primarily achieved by the
interaction of the snap ridge 402 and the protrusion 403 on the
tray 100, with the snap ridge receiving portion on the lid. A
second ridge 404 can be disposed on the exterior periphery of the
snap ridge 402 that can cover and protect the edge of the lid from
contaminants and/or damage.
[0053] To facilitate opening of the tray 100 and lid, the tray 100
can include a tab 410 on a side of the tray 100, as illustrated in
FIG. 12. In some embodiments, the tab 410 on the tray 100 can have
a slot 411 into which the tab of the lid can pass. To attach the
lid to the tray 100, a user can pass a lid tab through the slot 411
and then close the lid to the tray 100 by engaging the snaps. In
order to remove the lid, a consumer can tear a portion of the tab
410 on the tray 100, releasing the lid tab. In some embodiments,
perforations 412 are disposed on the tray tab 410 to aid in
tearing. For purposes of sanitation and tamper-proofing of the
contained product, trays that have already been used or opened can
easily be identified by inspecting the tray tab 410 for torn
perforations 412. As depicted in FIGS. 11 and 12, the tab 410 can
be on one side of the tray 100. In the embodiment shown, the tab
410 is along the fifth side 101, but in other embodiments the tabs
can be on other sides or more than one side. Further, in some
embodiments the tabs 410 can have a roughened texture (not shown)
to improve grip.
[0054] To help preserve the seal between the lid and the tray 100,
the tray 100 can include a variety of attachment structures.
Although snap engagements are depicted in the illustrated
embodiment, other securement methods can be used including
adhesives, Luer connections, Velcro.RTM., and the like. Further,
other embodiments can include other types of snaps. In some
embodiments, increasing the number of snaps can add redundancy and
strengthen the hold between the lid and tray 100.
[0055] The design of the tray 100 can also reduce sliding among
multiple stacked containers. For example, the depressions in the
tray 100 can extend downward such that they can generally extend
into and match the upper grooves created by the curved walls of the
lid when a tray 100 is stacked on top of a lid. In some
embodiments, the third bottom ribs 260 projecting above the bottom
wall 201 can create depressions 261 on the outer bottom 200 surface
of the tray 100 which can accept complimentary projection on the
lid for resisting lateral movement of a tray 100 stacked on top of
a lid.
[0056] The lid and tray 100 can be made from a variety of
materials. In some embodiments, the lid and tray 100 can be made of
rigid plastic materials. For example, the lid and tray 100 can be
made of polyethylene terephthalate. Further, the lid can be made
clear to enhance visibility while the tray 100 can be opaque.
[0057] Reference throughout this specification to "some
embodiments" or "an embodiment" means that a particular feature,
structure or characteristic described in connection with the
embodiment is included in at least some embodiments. Thus,
appearances of the phrases "in some embodiments" or "in an
embodiment" in various places throughout this specification are not
necessarily all referring to the same embodiment. Furthermore, the
particular features, structures or characteristics may be combined
in any suitable manner, as would be apparent to one of ordinary
skill in the art from this disclosure, in one or more
embodiments.
[0058] In the above description of embodiments, various features of
the inventions are sometimes grouped together in a single
embodiment, figure, or description thereof for the purpose of
streamlining the disclosure and aiding in the understanding of one
or more of the various inventive aspects. This method of
disclosure, however, is not to be interpreted as reflecting an
intention that any claim require more features than are expressly
recited in that claim. Rather, inventive aspects lie in a
combination of fewer than all features of any single foregoing
disclosed embodiment.
[0059] Although the invention(s) presented herein have been
disclosed in the context of certain preferred embodiments and
examples, it will be understood by those skilled in the art that
the invention(s) extend beyond the specifically disclosed
embodiments to other alternative embodiments and/or uses of the
invention(s) and obvious modifications and equivalents thereof
Thus, it is intended that the scope of the invention(s) herein
disclosed should not be limited by the particular embodiments
described above.
* * * * *