U.S. patent number 3,581,970 [Application Number 04/821,296] was granted by the patent office on 1971-06-01 for disposable serving tray.
This patent grant is currently assigned to Plastics, Inc.. Invention is credited to Albert E. Colato.
United States Patent |
3,581,970 |
Colato |
June 1, 1971 |
DISPOSABLE SERVING TRAY
Abstract
A serving tray including a body formed of a plastic material
having a thickness requiring external support including a bottom,
the bottom having an upstanding wall extending about the periphery
thereof with rib means formed on the outer surface of the bottom
together with a flat stiffening member of cardboard positioned upon
and in contact with the lower outer surface of the bottom and
extending within the rib means and the stiffening member secured
upon the bottom by an adhesive.
Inventors: |
Colato; Albert E. (West St.
Paul, MN) |
Assignee: |
Plastics, Inc. (St. Paul,
MN)
|
Family
ID: |
25233031 |
Appl.
No.: |
04/821,296 |
Filed: |
May 2, 1969 |
Current U.S.
Class: |
220/626;
D7/554.3 |
Current CPC
Class: |
A47G
23/06 (20130101) |
Current International
Class: |
A47G
23/06 (20060101); A47G 23/00 (20060101); B65d
001/34 () |
Field of
Search: |
;229/1.5,2.5
;220/69,71,72,97 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Bockenek; David M.
Claims
Having now therefore fully illustrated and described my invention,
what I claim to be new and desire to protect by United States
Letters Patent is:
1. A serving tray comprising:
a. a body formed of a plastic material having a thickness requiring
external support and including a bottom,
b. said bottom having an upstanding relatively low wall extending
about the periphery thereof,
c. rib means formed on and extending downwardly from said
bottom,
d. a flat stiffening member having a thickness substantially equal
to the height of the rib means positioned upon and in contact with
the lower outer surface of said bottom and extending within said
rib means, and
e. means for securing said stiffening member against the bottom
whereby the tray body when held at an edge thereof in an extended
horizontal position does not require other external support.
2. The device of claim 1 in which said rib means extends
substantially about the periphery of said bottom.
3. The device of claim 2 in which the outline of the stiffening
member is coterminous with that circumscribed by the inner edge of
the rib means.
4. The device of claim 3 in which the means for securing said
stiffening member against the bottom and within said rib means
includes an adhesive.
5. The device of claim 3 in which the stiffening member is of a
material different from the material from which said body is
formed.
Description
SUMMARY OF THE INVENTION
The invention relates to an improvement in serving trays and more
particularly to a disposable tray used for serving food, beverages
and the like. The use of plastic for serving trays is highly
desirable due to ease of manufacture, appearance and ease of
cleaning the tray. However, to provide an all plastic tray which
has enough serving area and is sufficiently rigid to support the
necessary objects, requires an amount of plastic material which in
many requirements makes the cost of the tray prohibitive for
disposable applications.
It is therefore an object of the invention to provide a serving
tray which has substantially all of the benefits and appearance of
an all plastic tray but with a cost which is materially less. With
the cost materially less the tray is, from an economic standpoint,
disposable. It is a further object of the invention to provide a
tray formed of a plastic of a thickness requiring external support
having a bottom and sidewalls with a peripheral rib formed on the
bottom within which a stiffening member is secured by an adhesive.
The rib aids in preventing displacement of the stiffening member
and conceals the edges of the stiffening member. The stiffening
member provides sufficient rigidity for the tray although the
remainder of the tray is made from plastic of a thickness
insufficient in itself for a tray.
These and other more detailed and specific objects will be
disclosed in the course of the following specification, reference
being had to the accompanying drawings, in which -
FIG. 1 is a top plan view of a tray embodying the invention.
FIG. 2 is a sectional view on the line 2-2 of FIG. 1.
FIG. 3 is an enlarged fragmentary sectional view on the line 3-3 of
FIG. 1 and represents a section taken at any similar position on
the periphery of the tray.
Referring to the drawings in detail, the tray A includes the body
10 formed of a plastic material of such a thin nature that it
requires external support for use as a tray. The tray body includes
the flat bottom 12, and formed on the bottom surface thereof and
extending downwardly therefrom is the rib 14 which extends
substantially about the periphery of the bottom, the rib being
spaced slightly inwardly of the outer edge of the bottom. The rib
14 may be formed hollow and open at the top as shown in particular
in FIGS. 2 and 3, or the same may be solid in cross section.
Extending upwardly from the edges of the bottom 12 about the
periphery thereof is the substantially upstanding wall 16.
Further provided is the stiffening member 18 which is a flat sheet
of relatively inexpensive material such as conventional corrugated
cardboard. The stiffening member 18 has a thickness substantially
equal to the height of the rib 14 whereby the edges of the member
18 are concealed. The rib 14 also prevents dislodgment of the
member 18. The outline of the member 18 is coterminous with that
circumscribed by the inner edge of the rib so that the stiffening
member snugly fits at all edges within the peripheral rib 14. The
member 18 is secured within the peripheral rib by adhesive 20
applied upon the upper surface of the member 18 and/or the bottom
surface of the bottom 12.
With the member 18 in position as described the entire bottom of
the tray is made rigid with little deflection of the tray in
use.
With the stiffening member 18 in place the tray is complete and may
be held by one hand of the operator in an extended horizontal
position with several articles thereon such as glasses, plates,
etc. with very little deflection. This is possible due to the
construction set forth although the body is formed of very thin
plastic. If the entire tray was formed of sufficient plastic to
provide little deflection when loaded and held in extended
horizontal position, the cost of the plastic would be substantially
more than the cost of the tray disclosed. In the present day market
and for many requirements the cost would be prohibitive. Further,
with the construction disclosed the stiffening element is not
observed from the top of the tray nor is observable from the edge
of the tray.
* * * * *