U.S. patent application number 11/095309 was filed with the patent office on 2005-10-20 for container assemblies with releasable locking feature.
Invention is credited to Brown, Scott D., Hayes, Thomas J..
Application Number | 20050230389 11/095309 |
Document ID | / |
Family ID | 32093251 |
Filed Date | 2005-10-20 |
United States Patent
Application |
20050230389 |
Kind Code |
A1 |
Hayes, Thomas J. ; et
al. |
October 20, 2005 |
Container assemblies with releasable locking feature
Abstract
A container assembly comprises first and second containers. The
first container includes a first body portion and a first rim. The
first rim has a first plurality of ribs projecting generally
upwardly therefrom such that first spaces are formed between
adjacent ribs. The first rim has a generally convex shape. The
second container includes a second body portion and a second rim.
The second rim has a second plurality of ribs projecting generally
downwardly therefrom such that second spaces are formed between
adjacent ribs. The second rim has a generally concave shape. The
second container is shaped substantially the same as the first
container. The first and second rims have shapes that correspond
with each other when locked. The first and second containers are
adapted to be releasably lockable by fitting the first plurality of
ribs into respective second spaces and fitting the second plurality
of ribs into respective first spaces.
Inventors: |
Hayes, Thomas J.; (McHenry,
IL) ; Brown, Scott D.; (Winthrop Harbor, IL) |
Correspondence
Address: |
JENKENS & GILCHRIST, P.C.
225 WEST WASHINGTON
SUITE 2600
CHICAGO
IL
60606
US
|
Family ID: |
32093251 |
Appl. No.: |
11/095309 |
Filed: |
March 31, 2005 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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11095309 |
Mar 31, 2005 |
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10277303 |
Oct 22, 2002 |
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6886704 |
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Current U.S.
Class: |
220/4.21 |
Current CPC
Class: |
B65D 2543/00731
20130101; B65D 2543/00796 20130101; B65D 43/0208 20130101; B65D
2543/00296 20130101; B65D 2543/00685 20130101; B65D 2543/0062
20130101; B65D 1/34 20130101; B65D 2543/00537 20130101; B65D 11/188
20130101; B65D 2543/00092 20130101; B65D 21/0234 20130101; B65D
2543/00361 20130101; B65D 2543/00027 20130101 |
Class at
Publication: |
220/004.21 |
International
Class: |
B65D 006/28 |
Claims
What is claimed is:
1. A container assembly comprising: a first container including a
first continuous body portion and a first rim, the first rim
encompassing and projecting laterally outwardly from the first body
portion, the first rim having a first plurality of ribs projecting
generally upwardly therefrom such that first spaces are formed
between adjacent ribs, the first rim having a generally convex
shape; and a second container including a second continuous body
portion and a second rim, the second rim encompassing and
projecting laterally outwardly from the second body portion, the
second rim having a second plurality of ribs projecting generally
downwardly therefrom such that second spaces are formed between
adjacent ribs, the second rim having a generally concave shape, the
second container being shaped substantially the same as the first
container, wherein the first rim and the second rim have shapes
that correspond with each other when being releasably lockable to
each other, wherein the first container and the second container
are adapted to be releasably lockable to each other by fitting the
first plurality of upwardly-projecting ribs into respective second
spaces and fitting the second plurality of downwardly-projecting
ribs into respective first spaces.
2. The container assembly of claim 1 wherein the first and second
containers are bowls.
3. The container assembly of claim 1 wherein the first and second
containers are plates.
4. The container assembly of claim 1 wherein the first container is
a bowl and the second container is a plate.
5. The container assembly of claim 1 wherein the first and second
containers are platters.
6. The container assembly of claim 1 wherein the first and second
containers are made of polymeric material.
7. The container assembly of claim 6 wherein the first and second
containers are made of a mineral-filled polymeric material.
8. The container assembly of claim 6 wherein the first and second
containers include a high-impact polystyrene.
9. The container assembly of claim 1 wherein at least one of the
first and second containers is paper or metal.
10. The container assembly of claim 1 wherein the first plurality
of upwardly-projecting ribs and the second plurality of
downwardly-projecting ribs are generally perpendicular to the plane
of the remainder of the respective rims.
11. The container assembly of claim 10 wherein the first plurality
of upwardly-projecting ribs and the second plurality of
downwardly-projecting ribs are perpendicular to the plane of the
remainder of the respective rims.
12. The container assembly of claim 1 wherein the first plurality
of upwardly-projecting ribs comprises first and second sidewalls
spaced apart that are each generally perpendicular to the plane of
the remainder of the first rim and a generally first flat surface
that encompasses and bridges the first and second sidewalls, and
wherein the second plurality of downwardly-projecting ribs
comprises third and fourth sidewalls spaced part that are each
generally perpendicular to the plane of the remainder of the second
rim and generally second flat surface that encompasses and bridges
the third and fourth sidewalls.
13. The container assembly of claim 1 wherein the first plurality
of upwardly-projecting ribs comprises first and second sidewalls
and a surface that encompasses and bridges the first and second
sidewalls, at least one of the first and second sidewalls has a
first undercut, and wherein the second plurality of
downwardly-projecting ribs comprises third and fourth sidewalls and
a surface that encompasses and bridges the third and fourth
sidewalls, at least one of the third and fourth sidewalls has a
second undercut.
14. The container assembly of claim 1 wherein the first plurality
of upwardly-projecting ribs creates a first pattern that is
generally normal to the direction of the first rim, and the second
plurality of downwardly-projecting ribs creates a second pattern
that is generally normal to the direction of the second rim.
15. The container assembly of claim 14 wherein the first plurality
of upwardly-projecting ribs creates a first pattern that is normal
to the direction of the first rim, and the second plurality of
downwardly-projecting ribs creates a second pattern that is normal
to the direction of the second rim.
16. The container assembly of claim 1 wherein each of the first
plurality of upwardly-projecting ribs is generally concentric with
the center of the first container and each of the second plurality
of downwardly-projecting ribs is generally concentric with the
center of the second container.
17. The container assembly of claim 1 wherein each of the first
plurality of upwardly-projecting ribs and the second plurality of
downwardly-projecting ribs includes at least about 20 ribs.
18. The container assembly of claim 17 wherein each of the first
plurality of upwardly-projecting ribs and the second plurality of
downwardly-projecting ribs includes at least about 40 ribs.
19. The container assembly of claim 1 wherein the first rim and the
second rim are adapted to form a seal.
20. The container assembly of claim 19 wherein the seal is located
outwardly from the first plurality of upwardly-projecting ribs and
the second plurality of downwardly-projecting ribs.
21. The container assembly of claim 19 wherein the seal is located
inwardly from the first plurality of upwardly-projecting ribs and
the second plurality of downwardly-projecting ribs.
22. The container assembly of claim 1 wherein each of the first
plurality of upwardly-projecting ribs and the second plurality of
downwardly-projecting ribs includes at least about 2 sets of
ribs.
23. The container assembly of claim 1 wherein the first and second
containers are thermoformed.
24. A method of forming a container assembly, the method comprising
the acts of: providing a first container that includes a first
continuous body portion and a first rim, the first rim encompassing
and projecting laterally outwardly from the first body portion, the
first rim having a first plurality of ribs projecting generally
upwardly therefrom such that first spaces are formed between
adjacent ribs, the first rim having a generally convex shape;
providing a second container that includes a second continuous body
portion and a second rim, the second rim encompassing and
projecting laterally outwardly from the second body portion, the
rim having a second plurality of ribs projecting generally
downwardly therefrom such that second spaces are formed between
adjacent ribs, the second rim having a generally concave shape, the
second container being shaped substantially the same as the first
container; flipping one of the first container and the second
container such that the first container and second container are
generally aligned, the first and second rims are next to each
other, and the first and second rims correspond with each other
such that the first and second rims are either both in a generally
concave orientation or a generally convex orientation; and fitting
the first plurality of upwardly-projecting ribs into respective
second spaces and fitting the second plurality of
downwardly-projecting ribs into respective first spaces such that
the first container and the second container are releasably
lockable to each other.
25. The method of claim 24 further including placing a food article
on at least one of the first container and the second container
before fitting the first plurality of upwardly-projecting ribs into
respective second spaces and fitting the second plurality of
downwardly-projecting ribs into respective first spaces.
26. The method of claim 24 wherein the first and second containers
are bowls.
27. The method of claim 24 wherein the first and second containers
are plates.
28. The method of claim 24 wherein the first and second containers
are made of polymeric material.
29. The method of claim 28 wherein the first and second containers
include a high-impact polystyrene.
30. The method of claim 24 wherein the first plurality of
upwardly-projecting ribs and the second plurality of
downwardly-projecting ribs are generally perpendicular to the plane
of the remainder of the respective rims.
31. The method of claim 24 wherein the first plurality of
upwardly-projecting ribs comprises first and second sidewalls and a
surface that encompasses and bridges the first and second
sidewalls, at least one of the first and second sidewalls has a
first undercut, and wherein the second plurality of
downwardly-projecting ribs comprises third and fourth sidewalls and
a surface that encompasses and bridges the third and fourth
sidewalls, at least one of the third and fourth sidewalls has a
second undercut.
32. The method of claim 24 wherein the first plurality of
upwardly-projecting ribs creates a first pattern that is generally
normal to the direction of the first rim, and the second plurality
of downwardly-projecting ribs creates a second pattern that is
generally normal to the direction of the second rim.
33. The method of claim 24 wherein each of the first plurality of
upwardly-projecting ribs is generally concentric with the center of
the first container and each of the second plurality of
downwardly-projecting ribs is generally concentric with the center
of the second container.
34. The method of claim 24 wherein the first rim and the second rim
are adapted to form a seal.
35. The method of claim 34 wherein the seal is located outwardly
from the first plurality of upwardly-projecting ribs and the second
plurality of downwardly-projecting ribs.
36. A container assembly comprising: a first container including a
first continuous body portion and a first rim, the first rim
encompassing and projecting laterally outwardly from the first body
portion, the first rim having a first plurality of upwardly
projecting features with first spaces being formed between adjacent
upwardly projecting features, the first rim having a generally
convex shape; and a second container including a second continuous
body portion and a second rim, the second rim encompassing and
projecting laterally outwardly from the second body portion, the
rim having a second plurality of downwardly projecting features
with second spaces being formed between adjacent downwardly
projecting features, the second rim having a generally concave
shape, the second container being shaped substantially the same as
the first container, wherein the first container and the second
container are adapted to be releasably lockable to each other by
fitting the first plurality of upwardly projecting features into
respective second spaces and fitting the second plurality of
downwardly projecting features into respective first spaces.
37. The container assembly of claim 36 wherein the first and second
containers are made of polymeric material.
38. The container assembly of claim 36 wherein the first rim and
the second rim are adapted to form a seal.
39. The container assembly of claim 38 wherein the seal is located
outwardly from the first plurality of upwardly-projecting ribs and
the second plurality of upwardly-projecting ribs.
40. The container assembly of claim 38 wherein the seal is located
inwardly from the first plurality of upwardly-projecting ribs and
the second plurality of upwardly-projecting ribs.
41. A container assembly comprising: a first container including a
first continuous body portion and a first rim, the first rim
encompassing and projecting laterally outwardly from the first body
portion, the first rim having a generally convex shape, the first
rim having a first plurality of ribs projecting generally upwardly
therefrom such that first spaces are formed between adjacent ribs,
the first plurality of upwardly-projecting ribs creating a first
pattern that is generally normal to the direction of the first rim,
the first plurality of upwardly-projecting ribs having at least one
undercut; and a second container including a second continuous body
portion and a second rim, the second rim encompassing and
projecting laterally outwardly from the second body portion, the
second rim having a generally concave shape, the second rim having
a second plurality of ribs projecting generally downwardly
therefrom such that second spaces are formed between adjacent ribs,
the second plurality of downwardly-projecting ribs creating a
second pattern that is generally normal to the direction of the
second rim, the second plurality of downwardly-projecting ribs
having at least one undercut, the second container being shaped
substantially the same as the first container, wherein the first
container and the second container are adapted to be releasably
lockable to each other by fitting the first plurality of
upwardly-projecting ribs into respective second spaces and fitting
the second plurality of downwardly-projecting ribs into respective
first spaces.
42. The container assembly of claim 41 wherein the first and second
containers are bowls.
43. The container assembly of claim 41 wherein the first and second
containers are plates.
44. The container assembly of claim 41 wherein the first and second
containers are made of polymeric material.
45. The container assembly of claim 44 wherein the first and second
containers include a high-impact polystyrene.
46. The container assembly of claim 41 wherein the first plurality
of upwardly-projecting ribs creates a first pattern that is normal
to the direction of the first rim, and the second plurality of
downwardly-projecting ribs creates a second pattern that is normal
to the direction of the second rim.
47. The container assembly of claim 41 wherein the first rim and
the second rim are adapted to form a seal.
48. The container assembly of claim 41 wherein each of the first
plurality of downwardly-projecting ribs includes two undercuts and
each of the second plurality of upwardly-projecting ribs includes
two undercuts.
49. A container assembly comprising: a first container including a
first continuous body portion and a first rim, the first rim
encompassing and projecting laterally outwardly from the first body
portion, the first rim having a first plurality of ribs projecting
generally upwardly therefrom such that first spaces are formed
between adjacent ribs, the first rim having a generally convex
shape; and a second container including a second continuous body
portion and a second rim, the second rim encompassing and
projecting laterally outwardly from the second body portion, the
second rim having a second plurality of ribs projecting generally
downwardly therefrom such that second spaces are formed between
adjacent ribs, the second rim having a generally concave shape,
wherein the first rim and the second rim have shapes that
correspond with each other when being releasably lockable to each
other, wherein the first container and the second container are
adapted to be releasably lockable to each other by fitting the
first plurality of upwardly-projecting ribs into respective second
spaces and fitting the second plurality of downwardly-projecting
ribs into respective first spaces.
50. The container assembly of claim 49 wherein the first and second
containers are made of polymeric material.
51. The container assembly of claim 50 wherein the first and second
containers are made of a mineral-filled polymeric material.
52. The container assembly of claim 50 wherein the first and second
containers include a high-impact polystyrene.
53. The container assembly of claim 49 wherein the first plurality
of upwardly-projecting ribs and the second plurality of
downwardly-projecting ribs are generally perpendicular to the plane
of the remainder of the respective rims.
54. The container assembly of claim 49 wherein the first plurality
of upwardly-projecting ribs comprises first and second sidewalls
and a surface that encompasses and bridges the first and second
sidewalls, at least one of the first and second sidewalls has a
first undercut, and wherein the second plurality of
downwardly-projecting ribs comprises third and fourth sidewalls and
a surface that encompasses and bridges the third and fourth
sidewalls, at least one of the third and fourth sidewalls has a
second undercut.
55. The container assembly of claim 49 wherein the first plurality
of upwardly-projecting ribs creates a first pattern that is
generally normal to the direction of the first rim, and the second
plurality of downwardly-projecting ribs creates a second pattern
that is generally normal to the direction of the second rim.
56. The container assembly of claim 55 wherein the first plurality
of upwardly-projecting ribs creates a first pattern that is normal
to the direction of the first rim, and the second plurality of
downwardly-projecting ribs creates a second pattern that is normal
to the direction of the second rim.
57. The container assembly of claim 49 wherein each of the first
plurality of upwardly-projecting ribs and the second plurality of
downwardly-projecting ribs includes at least about 20 ribs.
58. The container assembly of claim 57 wherein each of the first
plurality of upwardly-projecting ribs and the second plurality of
downwardly-projecting ribs includes at least about 40 ribs.
59. A method of forming a container assembly, the method comprising
the acts of: providing a first container that includes a first
continuous body portion and a first rim, the first rim encompassing
and projecting laterally outwardly from the first body portion, the
first rim having a first plurality of ribs projecting generally
upwardly therefrom such that first spaces are formed between
adjacent ribs, the first rim having a generally convex shape;
providing a second container that includes a second continuous body
portion and a second rim, the second rim encompassing and
projecting laterally outwardly from the second body portion, the
rim having a second plurality of ribs projecting generally
downwardly therefrom such that second spaces are formed between
adjacent ribs, the second rim having a generally concave shape;
flipping one of the first container and the second container such
that the first container and second container are generally
aligned, the first and second rims are next to each other, and the
first and second rims correspond with each other such that the
first and second rims are either both in a generally concave
orientation or a generally convex orientation; and fitting the
first plurality of upwardly-projecting ribs into respective second
spaces and fitting the second plurality of downwardly-projecting
ribs into respective first spaces such that the first container and
the second container are releasably lockable to each other.
60. The method of claim 59 further including placing a food article
on at least one of the first container and the second container
before fitting the first plurality of upwardly-projecting ribs into
respective second spaces and fitting the second plurality of
downwardly-projecting ribs into respective first spaces.
61. The method of claim 59 wherein the first and second containers
are made of polymeric material.
62. The method of claim 59 wherein the first plurality of
upwardly-projecting ribs comprises first and second sidewalls and a
surface that encompasses and bridges the first and second
sidewalls, at least one of the first and second sidewalls has a
first undercut, and wherein the second plurality of
downwardly-projecting ribs comprises third and fourth sidewalls and
a surface that encompasses and bridges the third and fourth
sidewalls, at least one of the third and fourth sidewalls has a
second undercut.
63. The method of claim 59 wherein the first plurality of
upwardly-projecting ribs creates a first pattern that is generally
normal to the direction of the first rim, and the second plurality
of downwardly-projecting ribs creates a second pattern that is
generally normal to the direction of the second rim.
64. The method of claim 59 wherein the first rim and the second rim
are adapted to form a seal.
65. A container assembly comprising: a first container including a
first continuous body portion and a first rim, the first rim
encompassing and projecting laterally outwardly from the first body
portion, the first rim having a first plurality of upwardly
projecting features with first spaces being formed between adjacent
upwardly projecting features, the first rim having a generally
convex shape; and a second container including a second continuous
body portion and a second rim, the second rim encompassing and
projecting laterally outwardly from the second body portion, the
rim having a second plurality of downwardly projecting features
with second spaces being formed between adjacent downwardly
projecting features, the second rim having a generally concave
shape, wherein the first container and the second container are
adapted to be releasably lockable to each other by fitting the
first plurality of upwardly projecting features into respective
second spaces and fitting the second plurality of downwardly
projecting features into respective first spaces.
66. The container assembly of claim 65 wherein the first and second
containers are made of polymeric material.
67. The container assembly of claim 65 wherein the first rim and
the second rim are adapted to form a seal.
68. The container assembly of claim 67 wherein the seal is located
outwardly from the first plurality of upwardly-projecting ribs and
the second plurality of upwardly-projecting ribs.
69. The container assembly of claim 67 wherein the seal is located
inwardly from the first plurality of upwardly-projecting ribs and
the second plurality of upwardly-projecting ribs.
70. A container assembly comprising: a first container including a
first continuous body portion and a first rim, the first rim
encompassing and projecting laterally outwardly from the first body
portion, the first rim having a generally convex shape, the first
rim having a first plurality of ribs projecting generally upwardly
therefrom such that first spaces are formed between adjacent ribs,
the first plurality of upwardly-projecting ribs creating a first
pattern that is generally normal to the direction of the first rim,
the first plurality of upwardly-projecting ribs having at least one
undercut; and a second container including a second continuous body
portion and a second rim, the second rim encompassing and
projecting laterally outwardly from the second body portion, the
second rim having a generally concave shape, the second rim having
a second plurality of ribs projecting generally downwardly
therefrom such that second spaces are formed between adjacent ribs,
the second plurality of downwardly-projecting ribs creating a
second pattern that is generally normal to the direction of the
second rim, the second plurality of upwardly-projecting ribs having
at least one undercut, the first container being shaped
substantially the same as the second container, wherein the first
container and the second container are adapted to be releasably
lockable to each other by fitting the first plurality of
upwardly-projecting ribs into respective second spaces and fitting
the second plurality of downwardly-projecting ribs into respective
first spaces.
71. The container assembly of claim 70 wherein the first and second
containers are made of polymeric material.
72. The container assembly of claim 70 wherein the first plurality
of upwardly-projecting ribs creates a first pattern that is normal
to the direction of the first rim, and the second plurality of
downwardly-projecting ribs creates a second pattern that is normal
to the direction of the second rim.
73. The container assembly of claim 70 wherein the first rim and
the second rim are adapted to form a seal.
Description
RELATED APPLICATION
[0001] The present invention is a continuation-in-part application
of application Ser. No. 10/277,303 entitled "Containers and
Container Assemblies with Releasable Locking Feature" that was
filed on Oct. 22, 2002, which is incorporated by reference in its
entirety.
FIELD OF INVENTION
[0002] The present invention relates generally to container
assemblies. More particularly, the present invention relates to
releasably lockable container assemblies.
BACKGROUND OF THE INVENTION
[0003] The use of inexpensive polymeric, paper or metal packaging
containers has become popular, especially for preparing and serving
various food products. Polymeric, paper and metal containers
generally have been used for heating the food product(s) disposed
therein. Container assemblies typically comprise a cover or lid and
a base.
[0004] It would be desirable to have a container assembly that
would be easy for the customer to close and open. It would also be
desirable to provide a container assembly that is releasably
lockable and prevents or inhibits material, such as liquid, from
leaving the container.
SUMMARY OF THE INVENTION
[0005] According to one embodiment, a container assembly comprises
a first container and a second container. The first container
includes a first continuous body portion and a first rim. The first
rim encompasses and projects laterally outwardly from the first
body portion. The first rim has a first plurality of ribs
projecting generally upwardly therefrom such that first spaces are
formed between adjacent ribs. The first rim has a generally convex
shape. The second container includes a second continuous body
portion and a second rim. The second rim encompasses and projects
laterally outwardly from the second body portion. The second rim
has a second plurality of ribs projecting generally downwardly
therefrom such that second spaces are formed between adjacent ribs.
The second rim has a generally concave shape. The second container
is shaped substantially the same as the first container. The first
rim and the second rim have shapes that correspond with each other
when being releasably lockable to each other. The first container
and the second container are adapted to be releasably lockable to
each other by fitting the first plurality of upwardly-projecting
ribs into respective second spaces and fitting the second plurality
of downwardly-projecting ribs into respective first spaces.
[0006] According to one method, a container assembly is formed by
providing a first container that includes a first continuous body
portion and a first rim. The first rim encompasses and projects
laterally outwardly from the first body portion. The first rim has
a first plurality of ribs projecting generally upwardly therefrom
such that first spaces are formed between adjacent ribs. The first
rim has a generally convex shape. A second container is provided
that includes a second continuous body portion and a second rim.
The second rim encompasses and projects laterally outwardly from
the second body portion. The rim has a second plurality of ribs
projecting generally downwardly therefrom such that second spaces
are formed between adjacent ribs. The second rim has a generally
concave shape. The second container is shaped substantially the
same as the first container. One of the first container and the
second container is flipped such that the first container and
second container are generally aligned, the first and second rims
are next to each other, and the first and second rims correspond
with each other such that the first and second rims are either both
in a generally concave orientation or a generally convex
orientation. The first plurality of upwardly-projecting ribs fits
into respective second spaces and the second plurality of
downwardly-projecting ribs fits into respective first spaces such
that the first container and the second container are releasably
lockable to each other.
[0007] According to another embodiment, a container assembly
comprises a first container and a second container. The first
container includes a first continuous body portion and a first rim.
The first rim encompasses and projects laterally outwardly from the
first body portion. The first rim has a first plurality of upwardly
projecting features with first spaces being formed between adjacent
upwardly projecting features. The first rim has a generally convex
shape. The second container includes a second continuous body
portion and a second rim. The second rim encompasses and projects
laterally outwardly from the second body portion. The rim has a
second plurality of downwardly projecting features with second
spaces being formed between adjacent downwardly projecting
features. The second rim has a generally concave shape. The second
container is shaped substantially the same as the first container.
The first container and the second container are adapted to be
releasably lockable to each other by fitting the first plurality of
upwardly projecting features into respective second spaces and
fitting the second plurality of downwardly projecting features into
respective first spaces.
[0008] According to a further embodiment, a container assembly
comprises a first container and a second container. The first
container includes a first continuous body portion and a first rim.
The first rim encompasses and projects laterally outwardly from the
first body portion. The first rim has a generally convex shape. The
first rim has a first plurality of ribs projecting generally
upwardly therefrom such that first spaces are formed between
adjacent ribs. The first plurality of upwardly-projecting ribs
creates a first pattern that is generally normal to the direction
of the first rim. The first plurality of upwardly-projecting ribs
has at least one undercut. The second container includes a second
continuous body portion and a second rim. The second rim
encompasses and projects laterally outwardly from the second body
portion. The second rim has a generally concave shape. The second
rim has a second plurality of ribs projecting generally downwardly
therefrom such that second spaces are formed between adjacent ribs.
The second plurality of downwardly-projecting ribs creates a second
pattern that is generally normal to the direction of the second
rim. The second plurality of downwardly-projecting ribs has at
least one undercut. The second container is shaped substantially
the same as the first container. The first container and the second
container are adapted to be releasably lockable to each other by
fitting the first plurality of upwardly-projecting ribs into
respective second spaces and fitting the second plurality of
downwardly-projecting ribs into respective first spaces.
[0009] According to yet another embodiment, a container assembly
comprises a first container and a second container. The first
container includes a first continuous body portion and a first rim.
The first rim encompasses and projects laterally outwardly from the
first body portion. The first rim has a first plurality of ribs
projecting generally upwardly therefrom such that first spaces are
formed between adjacent ribs. The first rim has a generally convex
shape. The second container includes a second continuous body
portion and a second rim. The second rim encompasses and projects
laterally outwardly from the second body portion. The second rim
has a second plurality of ribs projecting generally downwardly
therefrom such that second spaces are formed between adjacent ribs.
The second rim has a generally concave shape. The first rim and the
second rim have shapes that correspond with each other when being
releasably lockable to each other. The first container and the
second container are adapted to be releasably lockable to each
other by fitting the first plurality of upwardly-projecting ribs
into respective second spaces and fitting the second plurality of
downwardly-projecting ribs into respective first spaces.
[0010] According to another method, a container assembly is formed
by providing a first container that includes a first continuous
body portion and a first rim. The first rim encompasses and
projects laterally outwardly from the first body portion. The first
rim has a first plurality of ribs projecting generally upwardly
therefrom such that first spaces are formed between adjacent ribs.
The first rim has a generally convex shape. A second container is
provided that includes a second continuous body portion and a
second rim. The second rim encompasses and projects laterally
outwardly from the second body portion. The rim has a second
plurality of ribs projecting generally downwardly therefrom such
that second spaces are formed between adjacent ribs. The second rim
has a generally concave shape. One of the first container and the
second container is flipped such that the first container and
second container are generally aligned, the first and second rims
are next to each other, and the first and second rims correspond
with each other such that the first and second rims are either both
in a generally concave orientation or a generally convex
orientation. The first plurality of upwardly-projecting ribs fits
into respective second spaces and the second plurality of
downwardly-projecting ribs fits into respective first spaces such
that the first container and the second container are releasably
lockable to each other.
[0011] According to yet a further embodiment, a container assembly
comprises a first container and a second container. The first
container includes a first continuous body portion and a first rim.
The first rim encompasses and projects laterally outwardly from the
first body portion. The first rim has a first plurality of upwardly
projecting features with first spaces being formed between adjacent
upwardly projecting features. The first rim has a generally convex
shape. The second container includes a second continuous body
portion and a second rim. The second rim encompasses and projects
laterally outwardly from the second body portion. The rim has a
second plurality of downwardly projecting features with second
spaces being formed between adjacent downwardly projecting
features. The second rim has a generally concave shape. The first
container and the second container are adapted to be releasably
lockable to each other by fitting the first plurality of upwardly
projecting features into respective second spaces and fitting the
second plurality of downwardly projecting features into respective
first spaces.
[0012] According to another embodiment, a container assembly
comprises a first container and a second container. The first
container includes a first continuous body portion and a first rim.
The first rim encompasses and projects laterally outwardly from the
first body portion. The first rim has a generally convex shape. The
first rim has a first plurality of ribs projecting generally
upwardly therefrom such that first spaces are formed between
adjacent ribs. The first plurality of upwardly-projecting ribs
creates a first pattern that is generally normal to the direction
of the first rim. The first plurality of upwardly-projecting ribs
has at least one undercut. The second container includes a second
continuous body portion and a second rim. The second rim
encompasses and projects laterally outwardly from the second body
portion. The second rim has a generally concave shape. The second
rim has a second plurality of ribs projecting generally downwardly
therefrom such that second spaces are formed between adjacent ribs.
The second plurality of downwardly-projecting ribs creates a second
pattern that is generally normal to the direction of the second
rim. The second plurality of downwardly-projecting ribs has at
least one undercut. The first container and the second container
are adapted to be releasably lockable to each other by fitting the
first plurality of upwardly-projecting ribs into respective second
spaces and fitting the second plurality of downwardly-projecting
ribs into respective first spaces.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1a is a side view of a first container to be used in
one embodiment of the invention.
[0014] FIG. 1b is a top view of the first container of FIG. 1a.
[0015] FIG. 1c is an enlarged top perspective view of a portion of
the first container of FIG. 1a.
[0016] FIG. 1d is an enlarged view of area labeled FIG. 1d in FIG.
1c;
[0017] FIG. 1e is an outline of the periphery of the first
container of FIG. 1a.
[0018] FIG. 2a is a side view of a second container to be used in
one embodiment of the invention.
[0019] FIG. 2b is a top view of the second container of FIG.
2a.
[0020] FIG. 2c is an enlarged top perspective view of a portion of
the second container of FIG. 2a.
[0021] FIG. 2d is an enlarged view of area labeled FIG. 2d in FIG.
2c;
[0022] FIG. 2e is an outline of the periphery of the second
container of FIG. 2a.
[0023] FIG. 3a is a side view of a container assembly using the
first container of FIG. 1a and the second container of FIG. 2a.
[0024] FIG. 3b is an outline of the peripheries of the first and
second containers used to form the container assembly of FIG.
3a.
[0025] FIG. 3c is an enlarged cross-sectional view depicting the
engagement between the ribs of the first and second containers;
[0026] FIG. 4 is an outline of the periphery of the first container
according to another embodiment.
[0027] FIG. 5a is a side view of a first container to be used in
another embodiment of the invention.
[0028] FIG. 5b is a top view of the first container of FIG. 5a.
[0029] FIG. 5c is a top view of the generally circular region FIG.
5c of FIG. 5a depicting two adjacent projecting ribs.
[0030] FIG. 5d is a perspective view of the generally circular
region FIG. 5c of FIG. 5a depicting two adjacent projecting
ribs.
[0031] FIG. 6a is a side view of a second container to be used in
another embodiment of the invention.
[0032] FIG. 6b is a top view of the second container of FIG.
6a.
[0033] FIG. 7a is a side view of a container assembly using the
first container of FIG. 5a and the second container of FIG. 6a.
[0034] FIG. 7b is an outline of the peripheries of the first and
second containers used to form the container assembly of FIG.
7a.
[0035] While the invention is susceptible to various modifications
and alternative forms, specific embodiments thereof have been shown
by way of example in the drawing and will herein be described in
detail. It should be understood, however, that it is not intended
to limit the invention to the particular forms disclosed but, on
the contrary, the intention is to cover all modifications,
equivalents, and alternatives falling within the spirit and scope
of the invention as defined by the appended claims.
DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
[0036] Referring to FIGS. 1a-e, 2a-e, a first container (e.g.,
plate 10) and a second container (e.g., plate 110) to be used in
one embodiment of the present invention are shown. The plate 10 of
FIGS. 1a-e is used with a second plate 110 of FIGS. 2a-e that may
be substantially the same to the plate 10 to form a container
assembly that is releasably lockable.
[0037] It is contemplated that other container assemblies may be
formed besides those using plates. For example, container
assemblies may be formed, but are not limited to, using plates,
bowls, platters, tubs, single-serve and family-size containers,
single-serve and family-size ovenware, and combinations thereof.
One such combination is a bowl and a plate that forms a container
assembly. The remainder of the application will discuss container
assemblies with respect to plates although it is recognized by one
of ordinary skill in the art that other container assemblies, such
as those discussed above, may be formed.
[0038] The height and shape of the container assembly may vary from
that shown without departing from the scope of the invention. For
example, the container assembly of FIGS. 3a, 3b as will be
discussed, are depicted as being generally circular. It is
contemplated that the container assemblies and containers for
forming the container assemblies used herein may be other shapes
such as rectangular, square, hexagonal, octagonal, other polygonal
shapes, or oval.
[0039] The container assemblies of the present invention are
typically used with respect to food, but may be used in other
applications such as with medical applications, cosmetics or other
items. Food container assemblies may be used for serving, storing,
preparing and/or re-heating the food.
[0040] Referring back to FIGS. 1a-e, the container 10 includes a
continuous body portion 12 and a continuous rim 14 encompassing and
projecting laterally outwardly from the body portion 12. As shown
in FIGS. 1a, 1e, the rim 14 has a generally convex shape. Referring
back to FIGS. 1a-1e, the body portion 12 includes a bottom 16 and a
continuous sidewall 18 encompassing and projecting upwardly and
outwardly from the bottom 16. It is contemplated that the sidewall
may project only upwardly from the bottom 16 or even project
upwardly and inwardly from the bottom 16. It is also contemplated
that the rim may not be continuous, although it is preferred to be
continuous.
[0041] Referring specifically to FIGS. 1a-d, the continuous rim 14
includes a plurality of ribs 20 that project generally upwardly
therefrom. The plurality of ribs 20 is spaced around the general
periphery of the container 10 and assists in forming a releasably
lockable container assembly. The orientation of the plurality of
ribs 20 creates a pattern that is generally normal to the direction
of the rim 14. More specifically, the orientation of the plurality
of ribs 20 may create a pattern that is normal to the direction of
the rim 14. In a radial configuration with a pattern that is normal
to the direction of the rim, each of the plurality of ribs 20, if
extended inwardly, would pass through the general center of the
plate.
[0042] The plurality of ribs 20, however, may be formed in
different patterns than shown in FIGS. 1a-d with respect to the rim
14 (e.g., diagonally). It may be desirable to form the plurality of
ribs 20 in a decorative pattern for aesthetic reasons. Such a
decorative feature may assist in "hiding" or disguising the
releasable lockable feature in the container 10. As shown in FIG.
1b, the container 10 has exactly 48 ribs formed in the continuous
rim 14. It is contemplated that the number of ribs may vary from
that shown in FIG. 1b. For example, a container may have from about
3 to about 10 ribs. A container may have greater than about 20 or
about 40 ribs, and may even have up to or greater than about 120
ribs. The desired number of ribs formed on the container will often
vary depending on factors such as the size or shape of the
container assembly, the material(s) type and thicknesses of the
container assembly, and the desired holding strength of the
container assembly. The desired holding strength depends on factors
such as the weight of item(s) placed in the container assembly and
its perceived usage.
[0043] Turning specifically to FIGS. 1c, 1d, the plurality of ribs
20 is shown in greater detail. FIGS. 1c, 1d depict a first rib 20a
and a second rib 20b with a space 22 being formed therebetween. The
first rib 20a of FIG. 1d comprises a generally flat surface 24 that
bridges two sidewalls 26, 28. The first rib 20a is shown as being
generally perpendicular to the plane of the remainder of the
continuous rim 14. More specifically, the rib may be perpendicular
to the plane of the remainder of the rim. The sidewalls 26, 28 are
spaced apart from each other and are shown as being generally
perpendicular to the plane of the remainder of the rim 14. The
sidewalls 26, 28, however, do not necessarily have to be generally
perpendicular or perpendicular to the remainder of the rim 14.
[0044] Similarly, second rib 20b of FIG. 1d comprises a generally
flat surface 30 that bridges two sidewalls 32, 34. The second rib
20b is also shown as being generally perpendicular to the plane of
the remainder of the rim 14. The sidewalls 32, 34 are spaced apart
from each other and are shown as being generally perpendicular to
the plane of the remainder of the rim 14.
[0045] To provide an improved locked container assembly, at least
one of the rib sidewalls may have an undercut. Such an optional
undercut formed in the rib sidewall engages a similar undercut in a
corresponding space formed between adjacent ribs of a second
container when the container assembly is formed. For example, in
FIG. 1d, optional undercuts 26a, 28a are formed in respective
sidewalls 26, 28. The size and shape of the undercut will often
vary depending on factors such as the size or shape of the
container assembly, the material(s) type and thicknesses of the
container assembly, and the desired holding strength of the
container assembly. The desired holding strength may depend on
factors such as the weight of item(s) placed in the container
assembly and its perceived usage.
[0046] The number of undercuts formed in the rib sidewalls, if any,
depends on factors such as the desired leak-resistant, the type of
closure mechanism, manufacturability of the container assemblies,
and the material(s) type and thicknesses used in forming the
container assemblies. For example, if the container assemblies are
made of a first material that has a higher coefficient of friction
than a second material, then the container made of the first
material will likely need less undercuts in its sidewalls than the
same container made with the second material to have the same
holding strength. The number of undercuts used also depends on the
fitness of use of the container assembly, including the holding
strength thereof.
[0047] It is contemplated that the ribs may have sidewalls with no
undercuts or at least one undercut (e.g., first rib 20a with
optional undercuts 26a, 28a in FIG. 1d). It is also contemplated
that some ribs within the same container may have no undercuts,
while other ribs may have one or more undercuts.
[0048] It is contemplated that the shape and size of the plurality
of ribs 20 may vary from that shown in FIGS. 1c, 1d. It is
preferred that the plurality of ribs be shaped and sized to
minimize the stacking height of the containers used to form
container assemblies. It is desirable to minimize the stacking
height of the containers to (a) reduce transportation costs and
packaging, and (b) provide space efficiency in retail and consumer
settings. It is also desirable to maximize the holding strength of
the container assembly. The desired holding strength is often a
balance between making the container assembly easy for a consumer
to open and close, while still preventing or inhibiting an
inadvertent opening of the container assembly.
[0049] It is contemplated that the upwardly-projecting features may
be shaped differently than the ribs shown in FIGS. 1c, 1d. For
example, the upwardly-projecting features may be a plurality of
round, oval, square, or polygonal features. It is contemplated that
many shapes and sizes may be formed by the upwardly-projecting
features used in the first container.
[0050] Referring to FIG. 4, a first container 50 includes a rim 52
in which the rim forms an optional seal feature 54 and a rib 56.
The rim 52 is shown as being generally convex. In FIG. 4, the
optional seal feature 54 is located outwardly from the rib 56 with
respect to the center of the container 50. In other words, the
optional seal feature 54 is located farther away from the center of
the container 50 than the rib 56. The optional seal feature 54 in
conjunction with a corresponding optional seal feature on a second
container with a generally concave rim (not shown), along with the
locked ribs of the container assembly, assist in preventing or
inhibiting material from leaving or entering the container
assembly. The optional seal feature is especially useful in
preventing or inhibiting product leakage that may occur due to
tolerances within the manufacturing process. To provide an
efficient seal, the height H1 of the optional seal feature 54
should be at least one-half of the rib height H2.
[0051] The optional seal feature, however, may be located inwardly
from the ribs such that the seal is formed nearer the center of the
container assembly as compared to the releasably lockable ribs.
[0052] Referring back to FIGS. 2a-e, the container 110 includes a
continuous body portion 112 and a continuous rim 114 encompassing
and projecting laterally outwardly from the body portion 112. As
shown in FIG. 2b, the rim 114 has a generally concave shape. The
body portion 112 includes a bottom 116 and a continuous sidewall
118 encompassing and projecting upwardly and outwardly from the
bottom 116. It is contemplated that the sidewall may project only
upwardly from the bottom 116 or even project upwardly and inwardly
from the bottom 116. It is also contemplated that the rim may not
be continuous, although it is preferred to be continuous.
[0053] Referring specifically to FIGS. 2a-d, the continuous rim 114
includes a plurality of ribs 120 that project generally downwardly
therefrom. The plurality of ribs 120 is spaced around the general
periphery of the container 110 and assists in forming a releasably
lockable container assembly. The orientation of the plurality of
ribs 120 creates a pattern that is generally normal to the
direction of the rim 114. More specifically, the orientation of the
plurality of ribs 120 may create a pattern that is normal to the
direction of the rim 114. In a radial configuration with a pattern
that is normal to the direction of the rim, each of the plurality
of ribs 120, if extended inwardly, would pass through the general
center of the plate.
[0054] The plurality of ribs 120, however, may be formed in
different patterns than shown in FIGS. 2a-d with respect to the rim
114 (e.g., diagonally). It may be desirable to form the plurality
of ribs 120 in a decorative pattern for aesthetic reasons. Such a
decorative feature may assist in "hiding" or disguising the
releasable lockable feature in the container 110. As shown in FIG.
2b, the container 110 has exactly 48 ribs formed in the continuous
rim 114. It is contemplated that the number of ribs may vary from
that shown in FIG. 2b. For example, a container may have from about
3 to about 10 ribs. A container may have greater than about 20 or
about 40 ribs, and may even have up to or greater than about 120
ribs. The desired number of ribs formed on the container will often
vary depending on factors such as the size or shape of the
container assembly, the material(s) type and thicknesses of the
container assembly, and the desired holding strength of the
container assembly. The desired holding strength depends on factors
such as the weight of item(s) placed in the container assembly and
its perceived usage.
[0055] Turning specifically to FIGS. 2c, 2d, the plurality of ribs
120 is shown in greater detail. FIGS. 2c. 2d depict a first rib
120a and a second rib 120b with a space 122 being formed
therebetween. The first rib 120a of FIG. 1d comprises a generally
flat surface 124 that bridges two sidewalls 126, 128. The first rib
120a is shown as being generally perpendicular to the plane of the
remainder of the continuous rim 114. More specifically, the rib may
be perpendicular to the plane of the remainder of the rim. The
sidewalls 126, 128 are spaced apart from each other and are shown
as being generally perpendicular to the plane of the remainder of
the rim 114. The sidewalls 126, 128, however, do not necessarily
have to be generally perpendicular or perpendicular to the
remainder of the rim 14.
[0056] Similarly, second rib 120b of FIG. 2d comprises a generally
flat surface 130 that bridges two sidewalls 132, 134. The second
rib 120b is also shown as being generally perpendicular to the
plane of the remainder of the rim 114. The sidewalls 132, 134 are
spaced apart from each other and are shown as being generally
perpendicular to the plane of the remainder of the rim 114.
[0057] To provide an improved locked container assembly, at least
one of the rib sidewalls may have an undercut. Such an optional
undercut formed in the rib sidewall engages a similar undercut in a
corresponding space formed between adjacent ribs of a second
container when the container assembly is formed. For example, in
FIG. 2d, optional undercuts 126a, 128a are formed in respective
sidewalls 126, 128. The size and shape of the undercut will often
vary depending on factors such as the size or shape of the
container assembly, the material(s) type and thicknesses of the
container assembly, and the desired holding strength of the
container assembly. The desired holding strength may depend on
factors such as the weight of item(s) placed in the container
assembly and its perceived usage.
[0058] The number of undercuts formed in the rib sidewalls, if any,
depends on factors such as the desired leak-resistant, the type of
closure mechanism, manufacturability of the container assemblies,
and the material(s) type and thicknesses used in forming the
container assemblies. For example, if the container assemblies are
made of a first material that has a higher coefficient of friction
than a second material, then the container made of the first
material will likely need less undercuts in its sidewalls than the
same container made with the second material to have the same
holding strength. The number of undercuts used also depends on the
fitness of use of the container assembly, including the holding
strength thereof.
[0059] It is contemplated that the ribs may have sidewalls with no
undercuts or at least one undercut (e.g., first rib 120a with
optional undercuts 126a, 128a in FIG. 2c). It is also contemplated
that some ribs within the same container may have no undercuts,
while other ribs may have one or more undercuts.
[0060] It is contemplated that the shape and size of the plurality
of ribs 120 may vary from that shown in FIGS. 2c, 2d. It is
preferred that the plurality of ribs be shaped and sized to
minimize the stacking height of the containers used to form
container assemblies. It is desirable to minimize the stacking
height of the containers to (a) reduce transportation costs and
packaging, and (b) provide space efficiency in retail and consumer
settings. It is also desirable to maximize the holding strength of
the container assembly. The desired holding strength is often a
balance between making the container assembly easy for a consumer
to open and close, while still preventing or inhibiting an
inadvertent opening of the container assembly.
[0061] It is contemplated that the downwardly projecting features
may be shaped differently than the ribs shown in FIGS. 2c, 2d. For
example, the downwardly projecting features may be a plurality of
round, oval, square, or polygonal features. It is contemplated that
many shapes and sizes may be formed by the downwardly projecting
features used in the second container.
[0062] A container assembly 100 according to one embodiment of the
present invention is depicted in FIGS. 3a, 3b. The container
assembly 100 comprises the first container 10 and the second
container 110.
[0063] According to one method, the second container 110 is flipped
180 degrees relative to the first container 10 such that the
containers 10, 110 are generally aligned and the rims 14, 114 are
adjacent to each other. This flipped position of container 110
relative to the container 10 is shown in FIG. 3a. To fit the ribs
into respective spaces, the container 110 may have to be rotated
slightly such that the ribs are offset (i.e., the ribs and spaces
are aligned). It is desirable that the consumer can assembly the
containers so as to form a container assembly of the present
invention.
[0064] Referring to FIG. 3c, adjacent ribs 120a, 120b of the
container 110 are fit into respective second spaces 22a, 22b of the
container 10 and ribs 20a, 20b of the container 10 are fit into
respective spaces 122a, 122b such that the container assembly 100
is releasably lockable. To fit the ribs into respective spaces, the
container 110 may have to be rotated slightly such that the ribs
are offset (i.e., the ribs and spaces are aligned). FIG. 3c also
depicts interference areas 124a, 124b formed between the first rib
20a and the space 122a created between ribs 120a, 120b of the
container 110.
[0065] The strength of this lockable closure is dependent on many
variables such as the number of the projecting ribs, the height of
those ribs, whether undercuts are included, the size of the contact
areas, the clearance needed between spaces and ribs, and the
material(s) type and thickness used in forming the container
assemblies. To improve the lockability of the container assembly,
as discussed above, an optional sealing feature may be added.
[0066] Referring to FIGS. 5a, 5b, a first container (e.g., plate
210) includes a continuous body portion 212 and a continuous rim
214 encompassing and projecting laterally outwardly from the body
portion 212. As shown in FIG. 5a, the rim 214 has a generally
convex shape. The body portion 212 includes a bottom 216 and a
continuous sidewall 218 encompassing and projecting upwardly and
outwardly from the bottom 216. It is contemplated that the sidewall
may project only upwardly from the bottom 216 or even project
upwardly and inwardly from the bottom 216. It is also contemplated
that the rim may not be continuous, although it is preferred to be
continuous.
[0067] Referring to FIGS. 5a-5d, the continuous rim 214 includes a
plurality of rib sets 220 that project generally upwardly
therefrom. The plurality of rib sets 220 is spaced around the
general periphery of the container 210 and assists in forming a
releasably lockable container assembly. The orientation of the
plurality of rib sets 220 creates a pattern that is generally
parallel or generally concentric with the general direction of the
rim 214. In other words, each of the plurality of rib sets 220, if
extended outwardly, would be no closer to the general center of the
container 210. The plurality of rib sets 220 is in the opposite
direction of the plurality of ribs 20 in FIGS. 1-3.
[0068] The plurality of rib sets 220, however, may be formed in
different patterns than shown in FIG. 5b with respect to the rim
214 (e.g., diagonally). It may be desirable to form the plurality
of rib sets 220 in a decorative pattern for aesthetic reasons. Such
a decorative feature may assist in "hiding" or disguising the
releasable lockable feature in the container 210.
[0069] The container 210 of FIG. 5b has exactly 30 sets of ribs
formed in the continuous rim 214. As will be discussed in more
detail below, each of the plurality of rib sets 220 has a first set
of ribs on a raised portion and a second set of ribs on a recessed
portion. It is contemplated that the number of rib sets may vary
from that shown in FIG. 5b. For example, a container may have from
about 2 to about 30 sets of ribs. A container may have greater than
about 40 or about 80 sets of ribs, and may even have up to or
greater than about 120 sets of ribs. The desired number of ribs
formed on the container will often vary depending on factors such
as the size or shape of the container assembly, the material(s)
type and thicknesses of the container assembly, and the desired
holding strength of the container assembly. The desired holding
strength may depend on factors such as the weight of item(s) placed
in the container assembly and its perceived usage.
[0070] Turning to FIGS. 5c, 5d, two adjacent sets of ribs are shown
in greater detail. The number of ribs in a set varies in FIGS. 5c,
5d depending on whether the ribs are located in a recessed area or
a raised area formed in the rim 214. For example, in FIGS. 5c, 5d,
recessed area 240 has a first rib 242 and a second rib 244 with
spaces 246, 248 and 250. Raised area 260 of FIGS. 5c, 5d, however,
has a first rib 262, a second rib 264, and a third rib 266 with
spaces 268, 270 therebetween.
[0071] Each of the ribs of FIG. 5c projects upwardly from the
continuous rim 214. For example, the first rib 242 of FIG. 13
comprises a generally flat surface 242a that bridges two sidewalls
242b, 242c. The first rib 242 is shown as being generally
perpendicular to the plane of the remainder of the continuous rim
214. The sidewalls 242b, 242c are spaced apart from each other and
are shown as being generally perpendicular to the plane of the
remainder of the rim 214. The sidewalls 242b, 242c, however, do not
necessarily have to be generally perpendicular or perpendicular to
the remainder of the rim 214.
[0072] To provide an improved locked container assembly, at least
one of the rib sidewalls may have an optional undercut. As
discussed above, such an undercut formed in the rib sidewall
engages a similar undercut in the spaces formed between adjacent
ribs when the container assembly is formed. The size and shape of
the undercut will often vary depending on factors such as the size
or shape of the container assembly, the material(s) type and
thicknesses of the container assembly, and the desired holding
strength of the container assembly. The desired holding strength
may depend on factors such as the weight of item(s) placed in the
container assembly and its perceived usage.
[0073] As discussed above, the number of undercuts formed in the
rib sidewalls, if any, depends on several factors. It is
contemplated that the ribs may have sidewalls with no undercuts or
at least one undercut. It is also contemplated that some ribs
within the same container may have no undercuts, while other ribs
have one or more undercuts.
[0074] The raised and recessed areas 240, 260 of FIG. 5d have a
plurality of ribs with generally flat areas. For example, the rib
242 includes the top surface or generally flat area 242a.
Similarly, the rib 264 includes a top surface or generally flat
area 264a. To improve the sealability of the container assembly,
the generally flat areas 264a, 242a may contact similar sized flat
areas formed in the spaces formed between adjacent ribs of a second
container that forms the container assembly. An example of a
similar sized flat area formed in a space is depicted in FIG. 5d
with space 246. As shown in FIG. 5d, a generally flat area 282 is
formed between adjacent sets of ribs (i.e., the raised and recessed
portions) to assist in releasably locking the container assembly.
It is contemplated that this area of the ribs may be sized and
shaped differently than shown in FIGS. 5c, 5d. It is contemplated
that the numbers of ribs in a set of ribs may vary from that shown
in FIGS. 5c, 5d (two ribs in the recessed areas and three ribs in
the raised areas).
[0075] It is contemplated that the first container 210 may include
shape and size of the plurality of ribs 220 may vary from that
shown in FIGS. 5b-d. It is preferred that the plurality of ribs be
shaped and sized to minimize the stacking height of the containers.
It is desirable to minimize the stacking height of the containers
to (a) reduce transportation costs and packaging, and (b) provide
space efficiency in retail and consumer settings. It is also
desirable to maximize the holding strength of the container
assembly. The desired holding strength is often a balance between
making the container assembly easy for a consumer to open and
close, while still preventing or inhibiting an inadvertent opening
of the container assembly.
[0076] It is contemplated that the first container 210 may include
an optional seal feature formed on the rim 214. The optional seal
feature may be located outwardly from the ribs 242, 244, 262, 264
and 266 of FIGS. 5c, 5d with respect to the center of the container
210. In other words, the optional seal feature may be located
farther away from the center of the container 210 than the ribs.
The optional seal feature in conjunction with a corresponding seal
feature on another container, along with the locked ribs of the
container assembly, assist in preventing or inhibiting material
from leaving or entering the container assembly. The optional seal
feature is especially useful in preventing or inhibiting product
leakage that may occur due to tolerances within the manufacturing
process. Such an optional seal feature may be formed similarly to
the optional seal feature 54 in FIG. 4.
[0077] The optional seal feature, however, may be located inwardly
from the ribs such that the seal is formed nearer the center of the
container assembly as compared to the releasably lockable ribs.
[0078] Turning to FIGS. 6a, 6b, the second container 310 includes a
continuous body portion 312 and a continuous rim 314 that
encompasses and projects laterally outwardly from the body portion
312. The continuous rim 314 has a generally concave shape. The body
portion 312 includes a bottom 316 and a continuous sidewall 318
encompassing and projecting upwardly and outwardly from the bottom
316. It is contemplated that the sidewall may project only upwardly
from the bottom 316 or even project upwardly and inwardly from the
bottom 216. It is also contemplated that the rim may not be
continuous, although it is preferred to be continuous. The second
container 310 is the same as the first container 210 except that
the continuous rim 214 of the first container has a generally
convex shape, while the continuous rim 314 of the second container
has a generally concave shape.
[0079] A container assembly 400 according to one embodiment of the
present invention is depicted in FIGS. 7a, 7b. The container 400
comprises the first container 210 of FIGS. 5a-d and the second
container 310 of FIGS. 6a, 6b. In one embodiment, the second
container 310 is shaped substantially the same as the first
container 210. As discussed above, the container assembly may be
formed with different first and second containers than plates. For
example, the container assembly may be formed using a bowl and a
plate.
[0080] The container assembly 400 of FIGS. 7a, 7b may be formed
according to one method by providing the first container 210 and
the second container 310. As discussed above with container
assembly 100, the second container 310 is flipped 180 degrees
relative to the first container 210 such that the containers 210,
310 are generally aligned and the rims 214, 314 are adjacent to
each other. This flipped position of the container 310 relative to
the container 210 is shown in FIGS. 7a, 7b.
[0081] The container assemblies of the present invention are
typically formed from polymeric materials, but may be formed from
materials such as paper or metal. The polymeric container
assemblies may be formed from polyolefins. The polymeric food
container assemblies are typically formed from orientated
polystyrene (OPS), polyethylene terephthalate (PET), polyvinyl
chloride (PVC), polypropylene and combinations thereof. The
containers assemblies may be made from a mineral-filled polymeric
material such as, for example, talc or calcium carbonate-filled
polyolefin. An example of paper that may be used in forming the
container assemblies is paperboard or molded fiber. Paperboard and
molded fiber typically have a sufficient coefficient of friction to
maintain the first and second containers in a lockable
position.
[0082] As discussed, the materials used in forming the container
assembly may assist in releasably locking the container assembly.
For example, the material(s) forming the container assembly may
have a fairly tacky laminate on one side that corresponds with a
fairly tacky laminate on the opposing side, resulting in a
desirable releasably lockable container assembly.
[0083] It is contemplated that the containers used in forming the
container assemblies may be made from different materials. It is
contemplated that one of ordinary skill in the art will recognize
that other polymers or combination of polymers may be used to form
the containers.
[0084] The container assemblies of the present invention are
typically disposable, but it is contemplated that they may be
reused at a future time. The containers used in forming the
container assemblies (e.g., containers 10, 110) are shown as
including one compartment. It is contemplated that the containers
may be formed of multiple compartments. Such containers are
desirable for placing items (e.g., food items) in different
compartments to prevent or inhibit commingling of items. For
example, undesirable mixing of food items can corrupt the flavor
and the consistency of the food items.
[0085] As discussed above, the container assemblies may be used
with food items. A method of using such container assemblies
includes placing the food and locking the containers to form a
container assembly with food therein. The container assembly is
then placed in a heating apparatus and heated. Typical heating
apparatuses include microwaves and conventional ovens. The
container assemblies may contain solid food products. The container
assemblies may be used for storage in the refrigerator and/or the
freezer.
[0086] The containers to be used in forming the container
assemblies of the present invention may be formed using
conventional thermoforming (e.g., by pressure, vacuum or the
combination thereof), injection-molding processes, or rotational
molding. According to one method of thermoforming, pellets of a
polymeric resin and additives, if any, are added into an extruder.
The pellets of the polymeric resin and additives, if any, are
melted to form a blend. The blend is extruded through a die to form
an extruded sheet. The extruded sheet is thermoformed to a desired
shape of a container to be used in forming the container
assembly.
[0087] The thickness of the container to be used in forming the
container assemblies generally ranges from about 0.002 to about
0.15 inch, but is typically from about 0.005 to about 0.04 inch.
The container assemblies may be opaque or a variety of colors or
color combinations. The container assemblies typically have at
least one transparent container if it is desired for the customer
to ascertain the nature of the accommodated product and the
condition thereof without having to open the container
assembly.
[0088] While particular embodiments and applications of the present
invention have been illustrated and described, it is to be
understood that the invention is not limited to the precise
construction and compositions disclosed herein and that various
modifications, changes, and variations may be apparent from the
foregoing descriptions without departing from the spirit and scope
of the invention as defined in the appended claims.
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