U.S. patent number 3,675,815 [Application Number 05/098,285] was granted by the patent office on 1972-07-11 for bakery tray.
Invention is credited to Houston Rehrig.
United States Patent |
3,675,815 |
Rehrig |
July 11, 1972 |
BAKERY TRAY
Abstract
A stacking, cross nesting bakery tray molded from a single
homogeneous mass of thermoplastic material and including a
rectangular, open grid bottom panel, opposed upwardly extending end
walls having vertically registering stacking means along their top
and bottom edges, and opposed upwardly extending side walls having
a vertical height no greater than half the height of the end walls
to permit cross nesting of two vertical stacks of the trays. The
end walls and side walls each include means facilitating filling of
the tray with packages of bakery products.
Inventors: |
Rehrig; Houston (Pasadena,
CA) |
Family
ID: |
22268627 |
Appl.
No.: |
05/098,285 |
Filed: |
December 16, 1970 |
Current U.S.
Class: |
206/507; 206/512;
211/126.2; D6/705.7 |
Current CPC
Class: |
B65D
21/046 (20130101) |
Current International
Class: |
B65D
21/04 (20060101); B65d 021/04 () |
Field of
Search: |
;220/97R,97C,97D,21,94A,72,74 ;211/126 ;206/45.31 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Lowrance; George E.
Claims
I claim:
1. In a molded plastic bakery tray including a rectangular bottom
wall, opposed generally vertical end walls having vertically
registering stacking means along their top and bottom edges, and
opposed side walls having a height no greater than one-half the
height of said end walls to permit cross nesting of two vertical
stacks of the trays, the improvement comprising first outwardly
inclined camming surface means extending along the top edge surface
of said end walls for substantially the full length thereof, said
first camming surface means forming an outwardly flaring extension
of the inner surface of said end walls, and second outwardly
inclined camming surface means on the top of said side walls and
extending substantially the full length thereof, said second
camming surface means forming an outwardly flaring extension of the
inner surface of said side walls, said first and second camming
surface means cooperating to cam bakery products inwardly when said
products engage the top surface of said end walls and said side
walls when the bakery products are being loaded into said tray
whereby the tendancy of the bakery products to become fouled on the
top of said end and side walls is greatly reduced.
2. In a bakery tray as defined in claim 1, the further improvement
comprising a generally triangular handhold opening in said end
walls, said triangular handhold openings each having one side edge
extending generally parallel to and spaced below the top edge
surface of its associated end panel and its remaining two side
edges extending downwardly and inclined inwardly toward one
another, and outwardly directed flange means reinforcing said end
walls adjacent the periphery of said handhold openings.
3. In a bakery tray as defined in claim 2, the further improvement
comprising a plurality of inspection openings formed in each of
said end walls in spaced relation to said handhold opening, said
inspection openings each having a pair of lower edges inclined
toward one another in the general configuration of an upwardly open
V whereby the tendency of bakery products being loaded into said
tray adjacent said end walls to become fouled on said inspection
openings is reduced.
4. In a bakery tray defined in claim 1, the further improvement
wherein the stacking means extending along the top surface of said
end walls comprises an outwardly and upwardly inclined flange, the
inner inclined surface of said flange defining said first camming
surface, and integrally molded webs reinforcing said flange at
spaced intervals along the outer surface thereof.
5. In the bakery tray defined in claim 4, the further improvement
comprising gusset means integrally molded with and extending
downwardly from said bottom wall at spaced intervals around the
outer periphery thereof, said gusset means connecting said bottom
wall with said end walls and said side walls to reinforce said
crate.
6. In the bakery tray defined in claim 5, the further improvement
comprising shoulder means on said gussets adapted to engage the
tops of said side walls to locate said tray with respect to a
similar tray nested therebeneath and rotated 90.degree. with
respect thereto.
7. In a bakery tray as defined in claim 6, the further improvement
wherein said bottom wall is of open grid construction and comprises
a plurality of longitudinal beams extending parallel to said side
walls and a plurality of transverse beams extending parallel to
said end walls.
8. The bakery tray defined in claim 7, wherein said parallel and
said transverse beams have a cross section in the general
configuration of the letter M, and wherein said bottom walls are
connected to said side walls and said end walls by beams offset
with respect to other beams in said bottom wall parallel thereto.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to molded plastic tray structures
of the type employed to carry a plurality of packages of bakery
products such as loads of bread, and more particularly to such a
tray which may be stacked with other like trays when filled, and
which may be cross nested with like trays when empty.
2. Description of the Prior Art
In the marketing of bakery products, and particularly relatively
delicate articles such as loaves of sliced bread which are easily
mashed, it is convention practice to employ shallow stackable trays
to handle a plurality of the individual packages. One such tray is
illustrated, for example, in U.S. Pat. No. 197,672. The prior art
trays have conventionally employed a generally rectangular bottom
panel with generally vertical opposed end walls incorporating
vertically registering stacking means along their top and bottom
edges to permit a plurality of the filled trays to be stacked one
upon the other. The side walls of the tray, if any are employed,
are normally only of sufficient height to prevent the loaves of
bread from sliding out of the tray so that the contents of the
individual trays in a stack of trays can readily be seen. Also, by
rotating alternate empty trays 90.degree., two vertical stacks may
be nested together to occupy only slightly more than one-half the
space of the stacks of filled trays.
While these prior art trays have enjoyed substantial commercial
success, they have not been entirely satisfactory in that their use
has frequently produced the very damage to the bakery products
which they are intended to prevent. For example, it is not uncommon
for the wrapper of the package such as a loaf of bread to catch on
the top edge of one of the walls of the tray, or on a protruding
edge surface of an inspection or other opening in a wall of the
tray so that the package does not drop completely into the tray.
This loaf of bread is then mashed to produce an unsightly and
unmarketable product when a second tray is stacked thereon.
SUMMARY OF THE INVENTION
The foregoing and other disadvantages of the prior art are avoided
in the bakery tray of the present invention by providing a
relatively rigid, strong, yet light weight construction which
resists excessive warping upon removal of the tray from the forming
mold, resists excessive deflection under normal loads, and which
incorporates novel means for preventing the individual packages
from becoming caught on the upwardly directed edge surfaces of the
end and side walls of the tray. The bottom panel is of an open grid
construction, with the openings in the bottom being bounded by
perpendicularly arranged bars each having a cross sectional shape
substantially in the form of the letter m which provides a very
high strength-to-weight factor for the panel to prevent sagging
under load to damage a filled tray stacked therebeneath. The top
edge surfaces of the end and side walls are inclined outwardly to
reduce the tendency of the product to hang thereon, and to act as a
cam to assist in loading the tray. Also, handhold and inspection
openings in the end, or stacking wall have outwardly directed
flanges formed therearound to reduce the tendency or the panel to
buckle inward in the area of the openings, and the lower portion of
such openings are generally V-shaped to reduce the tendency of
these openings to interfere with the free fall of the product into
the tray.
BRIEF DESCRIPTION OF THE DRAWINGS
Other objects and advantages of the present invention will become
apparent from the accompanying detailed description, taken in
conjunction with the drawings, wherein:
FIG. 1 is a perspective view of a bakery tray embodying the
invention;
FIG. 2 is a top plan view of the structure shown in FIG. 1;
FIG. 3 is a side elevation view thereof;
FIG. 4 is an end elevation view thereof;
FIG. 5 is a fragmentary bottom plan view thereof;
FIG. 6 is a fragmentary sectional view taken along line 6--6 of
FIG. 2;
FIG. 7 is a fragmentary sectional view taken on line 7--7 of FIG.
2;
FIG. 8 is a fragmentary sectional view taken along line 8--8 of
FIG. 2;
FIG. 9 is a fragmentary sectional view taken along line 9--9 of
FIG. 2;
FIG. 10 is a fragmentary sectional view taken along line 10--10 of
FIG. 9; and,
FIG. 11 is a fragmentary sectional view taken along line 11--11 of
FIG. 2.
DESCRIPTION OF A PREFERRED EMBODIMENT
Referring now to the drawings in detail, a bakery tray embodying
the present invention is indicated generally by the reference
numeral 10, and is illustrated as being molded from a single
homogeneous mass of thermoplastic material such, for example, as
high density polyethylene. The tray comprises a bottom panel 12,
opposed generally vertical end walls 14, 16 and opposed side walls
18, 20. The bottom panel 12 has a plurality of square or
rectangular openings 22 formed therein to define the open grid
pattern illustrated in FIG. 2. The openings 22 are bounded by
perpendicularly arranged, integrally joined beam members 24, each
having a substantially smooth top surface and having a cross
sectional shape substantially in the configuration of the letter M.
The downwardly directed legs 26 of the beam members 24 provide a
relatively high moment of inertia, and a correspondingly high
strength-to-weight ratio for the bottom panel 12. Thus, the bottom
panel 12 provides adequate support for a full tray load of bakery
products without excessive deflection which might cause the bottom
surface of the panel to sag sufficiently to engage and depress the
top surface of bakery products in a tray stacked thereunder.
As best seen in FIGS. 2 and 5, the individual beam members 24
positioned around the outer periphery of the bottom panel 12 are
offset with respect to other beam members in the grid. This offset
relation of the beam members 24 around the periphery of the bottom
panel provides, in effect, an expansion joint which accommodates
limited differential shrinkage between the bottom panel structure
and the side wall structure of the tray to thereby minimize the
tendency of the bottom panel to buckle upon removal of the tray
from the mold.
The walls 14, 16 are identical in construction, each comprising a
generally vertical, smooth panel 28 having a generally triangular
shaped handhold 30 formed therein, with one leg 32 of the
triangular opening extending generally parallel to and spaced below
the top edge of the panel 28, and with the other two legs 34, 36
being included downwardly therefrom. An outwardly directed flange
38 is integrally formed around the periphery of the handhold 30 to
provide stiffness to the panel 28 in the vicinity of the handhold
opening and to minimize the tendency of the panel to buckle out of
its plane in this area.
The panels 28 also have four identical, substantially square
inspection openings 40 formed therein to permit the contents of the
tray to be viewed through the end walls. The square openings 40 are
arranged with their sides inclined at approximately 45.degree. with
respect to the plane of the bottom panel 12, and each opening has
an outwardly directed flange 42 formed around its periphery to
stiffen and provide strength for the panel 28 and to minimize
buckling. Thus, the tendency for the lower edge of the side
openings and the handhold openings to buckle inward and thereby
interfere with the free fall of bakery products into the tray is
minimized, both by the use of the outwardly directed flanges around
the openings and by the configuration of the upwardly directed
surfaces of the openings which are inclined toward one another and
thereby act as a cam urging a dropping product inwardly.
As most clearly seen in FIGS. 8 and 9, the end panels 14, 16
terminate at their top edge in an upwardly extending flange 50
which is adapted to fit within an elongated upwardly directed
groove 52 in the lower edge of the respective end walls. Flange 50
is preferably inclined outwardly approximately 15.degree. with
respect to the vertical, and a plurality of integrally molded
gussets or web members 54 reinforce the flange 50 at spaced
intervals therealong. Gussets 54 connect the flange 50 with a
substantially E-shaped beam portion extending along the upper edge
of the end walls, with the inclined flange 50, the gussets 54, and
the beam 56 cooperating to provide substantial strength and
rigidity to the top of the end walls. Vertical webs 58 extend
between the beam 56 and an outwardly and downwardly inclined flange
60 which defines the outer portion of the groove 52.
As illustrated in FIG. 9, groove 52 is defined by a plurality of
reinforcing webs 62 integrally joining the flange 60 and flange 64.
Also, a plurality of integrally molded gussets 66 connect the
bottom edge of flange 64 to adjacent beam members 24 at spaced
intervals around the periphery of the bottom panel 12 to reinforce
the connection between the bottom panel and the end walls. Gussets
66 terminate at their inner end in a shoulder 68 adapted to engage
the outer surface of side walls 18,20 of a similar tray nested
therebelow to interlock the nested trays as will be described more
fully hereinbelow. Gussets 66 are dimensioned to provide minimum
interference with bakery products in a tray stacked therebelow.
As illustrated in FIGS. 1-3, the side walls 18, 20 and end walls
14, 16 are joined together at the respective corners of the tray by
a corner post section 70 of the same height as the end walls. The
posts 70 act as a lateral brace, adding substantial strength and
rigidity to the end walls at the corners of the tray. Also, an
upwardly extending web 72 on the top of each post section 70 forms,
in effect, a continuation of the stacking flange 50 extending
around the corners of the tray in position to project into the open
bottom end of a corresponding post 70 when the trays are stacked to
interlock the stacked trays against movement in a direction
parallel to the end walls.
Each of the corner posts 70 have an inclined lateral surface 74
which facilitates cross nesting of the trays by providing a wider
opening at the top of the tray than at the base of the corner post.
Inclined surface 74 merges into a short horizontal stacking
platform 76 on the top of the respective side walls 18, 20 at
opposed ends thereof, to provide a horizontal support or seat for a
nested tray. The inner edge 78 of platform 76 is positioned to
engage the shoulder 68 of a tray nested thereon to interlock the
trays against relative movement. Support surface 76 extends along
the top of side walls 18, 20 only a distance sufficient to extend
beneath and engage one bottom beam 24 at each corner of a tray
nested thereon.
As illustrated in FIGS. 6 and 7, walls 18 and 20 are made up of
laterally spaced inner and outer panels 80, 82, respectively joined
together at their top edges either by the platform 76 or by the
inclined web element 84 to define a hollow, inverted channel
structure. The side walls are reinforced by a plurality of webs 86
joining the panels 80, 82 at spaced intervals along their length to
provide a light weight, strong beam construction. The top web 84 is
illustrated as being inclined at approximately 45.degree. with
respect to the plane of the bottom panel 12, thereby serving to
facilitate loading the tray by acting as a cam to guide any package
contacting the top of the side wall into the interior of the
tray.
From the above, it can be seen that the molded plastic bakery tray
according to this invention is a substantial improvement over the
known bakery tray. The cam surfaces along the top of the end and
side walls provide a very simple, yet effective means for
eliminating the perplexing problem of packages of bakery products,
particularly loaves of bread, hanging or becoming fouled on the top
of the tray during the loading operation and thereafter being
mashed by a second tray stacked thereabove. A similar problem is
effectively overcome by the V-shaped upwardly directed surfaces of
the handholds and inspection openings in combination with the
reinforcing flanges around the openings which minimize the tendancy
of the pannels to buckle. The adverse effect of any limited inward
buckling is overcome by the camming action of the V-shaped openings
which tend to urge the packages inward as they drop so that they
fall onto the bottom of the tray.
While I have disclosed and described a preferred embodiment of my
invention, I wish it understood that I do not intend to be
restricted solely thereto, but that I do intend to include all
embodiments thereof which would be apparent to one skilled in the
art and which, within the spirit of the scope of my invention.
* * * * *