U.S. patent number 3,929,273 [Application Number 05/505,228] was granted by the patent office on 1975-12-30 for tray for strawberries and the like.
This patent grant is currently assigned to Hoerner Waldorf Corporation. Invention is credited to Elmer G. Swanson.
United States Patent |
3,929,273 |
Swanson |
December 30, 1975 |
Tray for strawberries and the like
Abstract
A tray is provided of two tray sections. The bottom portion
comprises a rectangular bottom panel, side and end walls extending
upwardly therefrom, and corner flaps hinged to the end walls and
secured in face contact with the side walls. The other portion
telescopes over the bottom portion and includes a top portion and
side and end walls, the end walls being provided with corner flaps
secured in face contact with the side walls. The trays are
impregnated with a wax containing coating and are very rigid. The
top of the top portion is cut to provide end wall liner panels, and
the corner flaps extend the full height of the side walls to
reinforce the corners.
Inventors: |
Swanson; Elmer G. (Salinas,
CA) |
Assignee: |
Hoerner Waldorf Corporation
(St. Paul, MN)
|
Family
ID: |
24009510 |
Appl.
No.: |
05/505,228 |
Filed: |
September 12, 1974 |
Current U.S.
Class: |
206/562; 206/509;
229/178; 229/120.14; 229/918; 229/161; 229/122.32 |
Current CPC
Class: |
B65D
5/48048 (20130101); B65D 5/0075 (20130101); B65D
5/321 (20130101); Y10S 229/918 (20130101) |
Current International
Class: |
B65D
5/48 (20060101); B65D 5/00 (20060101); B65D
5/498 (20060101); B65D 5/32 (20060101); B65D
005/22 (); 229 () |
Field of
Search: |
;229/23BT,34R,34HW,32 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Moorhead; Davis T.
Attorney, Agent or Firm: Best; Jerry F.
Claims
I claim:
1. A tray-like shipping container formed from a pair of separate
blanks of corrugated paperboard, said container including:
a first tray including a rectangular bottom wall, side and end
walls hingedly connected to the sides and ends of said bottom
panel,
corner flaps connected to the sides of said end walls and
adhesively secured in face contact with the inner surfaces of said
side walls,
a second tray including a top flange at each end thereof, side and
end panels hingedly connected to said top flanges and extending
downwardly therefrom,
corner panels hingedly connected to opposite ends of said end
panels and adhesively secured to the inner surfaces of said second
tray side panels,
said first and second trays being telescoped together with the side
walls of said first tray engaging the inner surfaces of said corner
panels of said second tray,
end wall liner panels hingedly connected to said flanges and
extending downwardly therefrom in spaced relation to said end
panels and engaging said bottom wall,
tongues projecting downwardly from said liner panels and engaging
in apertures in said bottom wall to form a hollow end wall, and
said structure resulting in side wall portions underlying said
flanges which are of four thicknesses of paperboard, and three
thickness hollow end walls.
2. The structure of claim 1 and in which:
said second tray includes a top connecting strap connecting the
center portions of said side walls,
supporting panels connected to opposite edges of said connecting
strap and extending downwardly therefrom into engagement with said
bottom wall of said first tray, and
tab means interconnecting said supporting panels and said bottom
wall extending through apertures in said bottom wall and
terminating substantially flush with the lower surface of said
bottom wall.
Description
This invention relates to an improvement in trays of the type used
in containing smaller open-top trays of strawberries and other
fruits and vegetables.
BACKGROUND OF THE INVENTION
Open top trays have been produced for containing various types of
fruits and vegetables, and also which can be used for other
materials if so desired. These trays are usually provided with
stacking means so that one tray may be stacked upon the other
without slipping any great amount laterally or endwise. It is this
general type of tray which the applicant has provided, but the
structure is such that it may be more readily made.
One such structure is shown in Reissue U.S. Pat. No. 26,386 issued
May 7, 1968 to W. B. Crane for a shipping container. In this
construction, a two part container is provided in which both of the
sections forming the container include corner flaps hingedly
secured to the side walls of the two sections, and which are folded
into connection with the container end walls. As a result, there
are five thicknesses of corrugated paperboard extending along the
side portions of the end walls to provide strength for the corner.
However, this leaves only two walls extending along the ends of the
side walls to support the corners so that the weight of the stack
of containers is supported only by these two walls in the event the
stack becomes slightly offset in a longitudinal direction.
In the formation of the containers shown in the patent, one side
wall of the flat blank forming the bottom portion of the container
is overlapped with a side wall of the flat blank forming the top
portion of the container and is adhered in face contact therewith.
The blank forming the top portion is folded to overlie the blank
forming the container bottom while the other side wall of the
bottom forming blank is folded through one hundred eighty degrees
and the second two side walls are secured together. This forms a
tubular container with open ends which may be closed in much the
manner of a conventional container by first folding the side wall
corner flaps inwardly, and then folding the bottom and top end wall
closure flaps inwardly.
SUMMARY OF THE INVENTION
In the present device, the tray is quite similar to that shown in
the above mentioned patent, but the corner flaps are hingedly
connected to the end walls of the two sections rather than to the
side walls thereof. As a result, the corners of the container are
supported by four thicknesses of paperboard extending along the
ends of the side walls, and three thicknesses of corrugated
paperboard extending along the ends of the corners. The trays thus
formed are accordingly extremely strong, and the strength is
increased by impregnating the corrugated board by passing the
blanks or the sheets forming the blanks through a cascade of molten
coating material which may be wax, plastic, or a combination
thereof. The trays thus formed are extremely strong and weather
resistant.
A feature of the present invention lies in the manner in which the
containers are formed. In place of combining the two portions of
the blank in the manner shown in FIG. 6 of the drawings of the
above mentioned patent the blanks are separately formed into trays
on a tray forming machine which is readily available on the market.
This forming machine accepts the flat blanks, folds the side and
end walls up into right angular relation to the base panel, folds
the corner flaps on the end walls inwardly of the side walls, and
adheres the corner flaps in place, thus forming two rigid trays.
These trays are telescoped together with the upper tray inverted
relative to the bottom tray, so that a telescoped container
structure is produced.
These and other objects and novel features of the present invention
will be more clearly and fully set forth in the following
specification and claims .
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the completed container.
FIG. 2 is a longitudinal vertical section, the position of the
section being indicated by the line 2--2 of FIG. 1.
FIG. 3 is an enlarged vertical section through an end of the side
wall, the position of the section being shown by the line 3--3 of
FIG. 1.
FIG. 4 is an enlarged exploded perspective view of a corner of the
two sections before they are telescoped together.
FIG. 5 is a diagrammatic view of the blank from which the bottom
section of the container is formed.
FIG. 6 is a perspective view of the blank from which the upper
portion of the container is formed.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The container, which is indicated in general by the letter A, is
formed of thw two blanks illustrated in FIGS. 5 and 6 of the
drawings. The blank 10, illustrated in FIG. 5 includes a bottom
wall 11 which is hingedly connected along parallel side edges by
hinge lines 12 to side walls 13. The rectangular bottom wall 11 is
also connected along fold lines 14 to end walls 15. The bottom wall
11 is rectangular so that the fold lines 12 and 14 are in right
angular relation.
Corner flaps 16 are hingedly connected to the sides of the end
walls 15 along fold lines 17, the fold lines 17 being slightly
inset from the fold lines 12 to allow for the thickness of the
corner flaps 16. Each of the side walls 13 is provided with a pair
of spaced generally U-shaped notches, the notches 19 being on
opposite sides of the center portions 20 of the side walls which
are the full height of the end portions 21 of the side walls. The
ends or upper corners of the corner flap 16 are notched as
indicated at 22 to fit the contour of the notches 19, the portions
of the corner flaps 16 adjoining the fold lines 15 being the full
height of the side and end walls as indicated at 23.
Pairs of apertures 24 extend in widely spaced relation along each
fold line 14, the apertures 24 being in the bottom wall 11 near the
fold lines 12 connecting the bottom wall to the side walls 13.
Central apertures 25 are provided in the bottom wall 11 adjoining
the fold lines 14 and midway between the fold lines 12 and are
designed to accommodate stacking lugs of the type which will be
described. Midway between the apertures 24 are rectangular
apertures 26 which are also spaced from the fold lines 12.
Ventilation apertures 27 may be provided in the bottom wall 11 if
it is so desired. The notches 19 are provided so that a similar
container stacked upon a lower container may be readily grasped and
removed from the stack.
The top section of the container is indicated in general by the
numeral 30, it includes a top portion 31 which is mainly cut away
to form vertically extending panels. The top panel 31 is hingedly
connected along a pair of fold lines 32 to end panels 33 and along
right angular fold lines 34 to side panels 35. Corner flaps or
panels 36 are foldably connected to the sides of the end walls 32
along fold lines 37 which are preferably slightly inset from the
fold lines 34 to allow for the thickness of the paperboard in
folding.
Each side wall 35 is provided with a pair of spaced notches 39
which are arranged on either side of center. These notches
correspond in shape to the notches 19 in the blank 10 as indicated
in FIG. 1 of the drawings. The top panel includes a flange 40
connected to each end wall 33, the inner edge of the flange 40
being connected along a fold line 41 to an end wall liner panel 42.
The end wall liner panels are similar in height to the end walls 33
and include downwardly projecting tabs 43 designed to engage in the
apertures 24 of the bottom wall 11 when the two blanks are
assembled. Each flange 40 is interrupted by U-shaped cut line 44
which terminates in the end wall liner panels 42. These cut lines
44 form tabs 45 which extend upwardly above the remainder of the
flange 40 as indicated in FIG. 1 so as to extend into an aperture
25 of the bottom wall 11 of a similar container stacked upon the
first. The top of the container also includes a transverse
connecting strip 46 connecting the opposite side walls. The
connecting strip 46 is connected along parallel fold lines 47 to
supporting panels 49 which are of a width substantially equal to
the height of the side and end walls 35 and 33. The supporting
panels 49 are provided with projecting tabs 50 which are designed
to engage in the apertures 26 in the bottom wall 11 when the two
parts of the container are connected together.
In forming the container A, the blanks 10 and 30 in flat form are
stacked in a forming machine which acts to apply glue either to the
corner flaps or panels such as 16 and 36 or to the side walls 13 or
35, and form the blank into a tray in which the side and end walls
extend up vertically from the base panel such as the bottom wall 11
or the top panel 31. Thus two trays are formed, and the proportions
are such that the top tray formed by the blank 30 can telescope
down over the bottom tray illustrated in general by the numeral
10.
The manner in which the two trays may telescope together is
diagrammatically illustrated in FIG. 4 of the drawings. As
indicated, the ends of the top flanges 40 are preferably of
generally triangular form as illustrated at 51 so as to provide a
greater length of hinge connection between the top and the side
walls 35. Once the two trays have been telescoped together, the end
wall liner panels 42 are folded downwardly, the tongues or lugs 43
engaging in the apertures 24 in the bottom wall 11. The supporting
walls 49 are also folded downwardly along the fold lines 47, the
tongues 50 on the lower edges of the supporting walls 49 engaging
in the apertures 26 in the bottom wall.
The two telescoping sections may frictionally engage, as they are
normally lifted by engagement with the lower section. However,
preferably some means are provided for locking the two sections.
This means may comprise locking tabs, or may comprise adhesive
applied between the inner surface of the corner panels 36 and the
outer surface of the walls 13. This adhesive may be applied just
before the two sections are telescoped together.
In accordance with the Patent Statutes, I have described the
principles of construction and operation of my improvement in TRAY
FOR STRAWBERRIES AND THE LIKE; and while I have endeavored to set
forth the best embodiment thereof, I desire to have it understood
that obvious changes may be made within the scope of the following
claims without departing from the spirit of my invention.
* * * * *