U.S. patent number 3,651,976 [Application Number 05/024,493] was granted by the patent office on 1972-03-28 for molded packaging tray.
This patent grant is currently assigned to Keyes Fibre Company. Invention is credited to Gilbert R. Chadbourne.
United States Patent |
3,651,976 |
Chadbourne |
March 28, 1972 |
MOLDED PACKAGING TRAY
Abstract
Molded packaging tray nestable with like tray comprises
plurality of interconnected elongate container sections. Each
container section has bottom wall with upwardly and outwardly
flaring side and end walls connected thereto. Outwardly extending
marginal rim is at top of side and end walls of each section.
Weakened tear lines along selected portions of marginal rims in
area where container sections are connected together enable
individual container sections to be separated from one another.
Trays are arranged for stacking one above the other with alternate
trays oriented differently from adjacent ones. Marginal rims of
each tray support bottom walls of container sections of tray
directly thereabove in stack.
Inventors: |
Chadbourne; Gilbert R.
(Oakland, ME) |
Assignee: |
Keyes Fibre Company
(Waterville, ME)
|
Family
ID: |
21820865 |
Appl.
No.: |
05/024,493 |
Filed: |
April 1, 1970 |
Current U.S.
Class: |
220/23.4; 47/86;
206/518; 206/558; 220/23.8; 229/406; 206/503; 206/519;
220/23.6 |
Current CPC
Class: |
B65D
1/30 (20130101); B65D 21/045 (20130101) |
Current International
Class: |
B65D
1/22 (20060101); B65D 1/30 (20060101); B65D
21/04 (20060101); B65d 021/04 (); B65d
001/34 () |
Field of
Search: |
;220/23.4,23.6,23.8,97D
;229/2.5 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Lowrance; George E.
Claims
What is claimed is:
1. A unitary molded packaging tray nestable with a like tray
comprising a plurality of individual elongate container sections
connected together, each section having a bottom wall with upwardly
and outwardly flaring side and end walls connected thereto, an
outwardly extending marginal rim at the top of the side and end
walls, and weakened tear lines along selected portions of the
marginal rims in the area where the container sections are
connected together whereby the individual container sections of the
tray may be separated from one another along the tear lines, and at
least two container sections connected together along their sides
with at least one additional container section connected along one
of its sides to the ends of the other container sections whereby a
second substantially identical tray oriented 180.degree. relative
to the first tray may be stacked directly above the first tray with
portions of the marginal rims of the first tray supporting the
bottom walls of the container sections of the second tray, and
shallow portions in the upwardly and outwardly flaring side and end
walls extending to a height below the uppermost plane of the tray
whereby ventilating currents circulate through and around the
container sections of a stack of packaging trays.
2. A unitary molded packaging tray as in claim 1 comprising five
elongate container sections with three of the sections connected
side-by-side and the other two sections connected end-to-end with
one of their sides connected to the ends of the other three
sections, and wherein shallow portions are provided in at least
three of the side and end walls of each container section.
Description
BACKGROUND OF THE INVENTION
The present invention relates to a molded packaging tray capable of
being stacked with other similar trays one above the other, and
more particularly to a stackable packaging tray comprising a
plurality of interconnected elongate container sections.
Packaging trays molded of fibrous wood and/or paper pulp material,
thermoplastics, and similar materials, are widely used today for
packaging a variety of items ranging from foodstuffs, like eggs and
easily bruised fruits, to other products, such as lightbulbs and
fragile ornaments. From a commercial standpoint packaging trays of
this general type must be easy and inexpensive to manufacture in
view of the relatively inexpensive nature of the products to be
packaged therein. Also, shipment to the ultimate user requires that
a maximum number of unfilled trays occupy a minimum volume; thus
the need for nesting tray arrangements. Finally, and most
important, the packaging trays must fulfill the needs of the
persons using them. In many packaging operations, trays loaded with
easily bruised fruit, for example, must be stacked one above the
other in order to conserve space. Often, the required individual
containers are rather small thereby rendering the stacking
operation extremely difficult if not impossible. Also, in cases
where easily perishable foods are packaged, care must be taken to
insure adequate ventilation and circulation of air around the
product to avoid or lessen spoilage.
Accordingly, it is an object of the present invention to provide a
nestable and stackable packaging tray having a plurality of
interconnected elongate container sections.
SUMMARY OF THE INVENTION
In accordance with the present invention, a unitary molded
packaging tray comprises a plurality of interconnected elongate
container sections. Each section has a bottom wall with upwardly
and outwardly flaring side and end walls connected thereto. An
outwardly extending marginal rim is at the top of the side and end
walls. Weakened tear lines are located along selected portions of
the marginal rims in the area where the container sections are
connected together so that the individual sections may be separated
from one another along the tear lines. At least several container
sections are connected together along their sides with at least one
additional container section connected along one of its sides to
the ends of the other container sections. A second substantially
identical tray oriented 180.degree. relative to the first tray may
be stacked directly above the first tray with portions of the first
tray supporting the bottom walls of the container sections of the
second tray.
The upwardly and outwardly flaring side and end walls of the
packaging tray of the present invention include shallow portions
that extend to a height below the uppermost plane of the tray. The
shallow wall portions enable ventilating currents to circulate
through and around the container sections of a stack of packaging
trays. Preferably, the packaging tray comprises five elongate
container sections with three of the sections connected
side-by-side and the other two sections connected end-to-end with
one of their sides connected to the ends of the other three
sections. Each container section includes a series of drainage
slots in the area where the side and end walls are connected to the
bottom wall. Also, the weakened tear lines may comprise
perforations along selected portions of the marginal rims in the
area where the container sections are connected together.
BRIEF DESCRIPTION OF THE DRAWING
Novel features and advantages of the present invention in addition
to those mentioned above will become apparent to those skilled in
the art from a reading of the following detailed description in
conjunction with the accompanying drawing wherein:
FIG. 1 is a top plan view of the lower molded packaging tray of a
stack of two trays according to the present invention;
FIG. 2 is a front elevational view of the stack of trays
illustrated in FIG. 1;
FIG. 3 is a sectional view taken along line 3--3 of FIG. 1; and
FIG. 4 is a fragmental sectional view showing a pair of trays in
nested position.
DETAILED DESCRIPTION OF THE INVENTION
Referring in more particularity to the drawing, the molded
packaging tray may be formed as a unitary structure integrally
molded of fibrous wood and/or paper pulp material according to
known pulp slurry deposition processes to provide a unitary molded
tray 10 of generally uniform thickness throughout. Each packaging
tray 10 comprises a plurality of individual container sections 12
arranged as best illustrated in FIG. 1. Each section 12 has a
substantially flat and rigid bottom wall 14 with upwardly and
outwardly flaring side and end walls 16, 17 connected thereto.
Slots 18 are located at the juncture of the bottom wall and the
side and end walls. The slots extend from the side and end walls
into the bottom wall to provide openings for the passage of air or
drainage of liquids. An outwardly extending marginal rim 20 is
positioned at the top of the side and end walls of each container
section. Weakened tear lines 22 formed by perforations, for
example, are provided along the marginal rims 20 in the area where
the container sections 12 are connected together. As explained more
fully below, the weakened tear lines facilitate separation of the
individual sections from one another.
In the embodiment of the invention illustrated in the drawing, the
packaging tray 10 includes a first grouping of three container
sections 12 arranged in side-by-side relationship. The middle
section of this grouping is connected along each of its side walls
16 to one of the side walls of each of the other two sections.
Also, the packaging tray 10 of the present invention includes a
second grouping of two container sections arranged in end-to-end
relationship with one of the sides 16 of the container sections of
the second grouping connected to the aligned end walls 17 of the
container sections of the first grouping, as best illustrated in
FIG. 1.
For purposes explained more fully below, the upwardly and outwardly
flaring side and end walls 16, 17 of each individual container
section 12 include shallow portions 24 that extend to a height
below the uppermost plane of the tray. The shallow portions 24
define air flow passageways when a plurality of similar packaging
trays are vertically stacked in the manner described below. The
passageways allow air currents to pass over and around the contents
of the container sections 12 to thereby lessen spoilage when the
trays are filled with delicate perishables.
In the vertical stack of molded packaging trays 10, every other
tray in the stack is oriented 180.degree. from its immediately
adjacent trays. Thus, as is clear from the drawing, portions of the
marginal rims 20 of each packaging tray 10 supportingly engage the
bottom walls 14 of the packaging tray directly thereabove in the
stack. Each packaging tray in the stack is supported at the
uppermost plane of the tray directly therebelow in the stack. As is
clear from FIGS. 2 and 3, the shallow portions 24 of the upwardly
and outwardly flaring side and end walls of the container sections
of each tray define a network of passageways for the flow of air
for ventilation purposes. The slots 18 in the individual sections
12 also assist in channeling air around the contents of the
container sections.
Ultimately, the container sections 12 comprising each packaging
tray 10 are separated from one another along the weakened tear
lines 22. A flexible overwrap may be sealed around each filled
section 12 with the bottom wall 14 serving as an anchor surface for
adhering the ends of the flexible overwrap. In certain instances it
may be desired to simply cover the individual sections 12 without
covering the slots 18.
FIG. 4 illustrates the manner in which the molded packaging trays
10 of the present invention are nested one within the other. Corner
ledges 26 are formed at the upper portion of each corner of each
container section 12. A nearly vertical side wall segment 28
extends upwardly from each corner ledge 26. As shown in FIG. 4,
when two or more molded packaging trays 10 are nested, one within
the other, the corner ledges 26 of the uppermost tray rest upon the
marginal rim of the tray directly therebelow. The side and end
walls 16, 17 of the individual sections 12 are thereby slightly
spaced from one another to prevent frictional engagement between
the side and end walls of adjacent trays in the nested array. As is
well known, this arrangement prevents locking frictional engagement
between nested trays.
* * * * *