U.S. patent number 3,727,824 [Application Number 05/213,032] was granted by the patent office on 1973-04-17 for box with interlocking inner wall panels.
This patent grant is currently assigned to Union Camp Corporation. Invention is credited to Charles Calia, Buddy E. Giebel.
United States Patent |
3,727,824 |
Giebel , et al. |
April 17, 1973 |
BOX WITH INTERLOCKING INNER WALL PANELS
Abstract
A four sided box formed from a substantially rectangular blank
having reinforced side walls formed of inner and outer side panels,
which inner side panels are extensions of the outer side panels
folded to lie flat against the inner faces of the walls, the
adjacent edges of the inner side panels having matching projections
and indentations which form mating locks when the panels are folded
into place and the adjacent edges of the inner side panels are
pressed against each other.
Inventors: |
Giebel; Buddy E. (Monroe,
MI), Calia; Charles (Lancaster, PA) |
Assignee: |
Union Camp Corporation
(Township of Wayne, NJ)
|
Family
ID: |
22793461 |
Appl.
No.: |
05/213,032 |
Filed: |
December 28, 1971 |
Current U.S.
Class: |
229/165;
229/117.16; 229/185.1; 229/178 |
Current CPC
Class: |
B65D
5/0281 (20130101) |
Current International
Class: |
B65D
5/02 (20060101); B65d 005/00 () |
Field of
Search: |
;229/16A,16R,16C,34R,34HW,41R,41B,31FS ;220/DIG.9 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Moorhead; Davis T.
Claims
Having thus described the invention, what is claimed is:
1. A blank made from a generally rectangular sheet adapted for
folding into a box having side walls and a bottom comprising outer
side panels joined together along vertical score lines, the free
edges of the end panels being adapted to be joined together to form
the blank into a tube, and an inner side panel joined to each of
the outer side panels along a longitudinal score line, said inner
side panels being separated by slots extending outwardly from the
vertical score lines, the adjacent edges of such slots having
matching projections and indentations, whereby when the blank is
formed into a box and the inner side panels are folded inwardly to
lie flat against the inner faces of the walls the matching
projections and indentations will mate and interlock the adjacent
edges of the inner side panels together.
2. The blank of claim 1 in which the matching projections and
indentations are generally rectangular in shape.
3. The blank of claim 1 in which the matching projections and
indentations are generally scalloped in shape.
4. A box formed from a generally rectangular blank of sheet
material cut, scored and folded into said box having side walls and
a bottom comprising outer side panels joined together along
vertical hinge lines to form a tube, and an inner side panel joined
to each of the outer side panels along a longitudinal hinge line
and folded inwardly to lie flat against the inner face of the side
wall, the adjacent vertical edges of the inner panels having
matching projections and indentations which mate to interlock such
edges together.
5. The box of claim 4 in which the matching projections and
indentations are generally rectangular in shape.
6. The box of claim 4 in which the matching projections and
indentations are generally scalloped in shape.
Description
BACKGROUND OF THE INVENTION
Boxes with reinforced side walls formed of inner and outer side
panels, which inner side panels are extensions of the outer side
panels reverse folded to lie flat against the inner faces of the
wall panels, are well known. It is common practice to lock such
inner panels in place with one or more tabs on the inner panel
fitting into slots or cutouts in the side or bottom edges of the
box (U.S. Pat. Nos. 2,965,279, 1,926,608, 2,702,663). This
necessitates accurate cutting of the blank in remote areas of the
blank to insure registry of the tab and slot when the box is set
up.
The slots between the adjacent inner panels with the matching
projections and indentations in the adjacent edges, as illustrated
in the blank form and described and claimed herein, are more
accurate, insure a positive matching lock, and are simple to make.
Furthermore, even if the projections and indentations are not
uniform throughout, they will still mate if they match each
other.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a box with reinforced
side walls formed of inner and outer side panels with the adjacent
edges of the inner side panels having matching projections and
indentations which mate to lock the inner panels in place against
the wall panels.
It is a further object to provide a blank for the box of the
present invention which is simple and economical to manufacture and
can be easily set up into a box.
BRIEF DESCRIPTION OF THE DRAWINGS
Other objects and advantages will become apparent from the
following description which is to be taken in conjunction with the
accompanying drawings, in which:
FIG. 1 is a plan view of the blank showing the score lines, cutouts
and slots which define the various panels of the box of the present
invention;
FIGS. 2, 3 and 4 are perspective views of the blank of FIG. 1
showing the folding of certain panels to complete one form of
bottom;
FIG. 5 is a perspective view of the completed box with the inner
side panels folded inwardly against the side walls;
FIG. 6 is an enlarged cross-sectional view along the line 6--6 of
FIG. 5;
FIG. 7 is an enlarged cross-sectional view along the line 7--7 of
FIG. 5; and
FIG. 8 shows a modified form of the projections and indentations
for locking the inner panels in place.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings there is shown in FIG. 1 a flat
substantially rectangular blank of sheet material, such as
corrugated board, fiberboard or the like of a weight suitable for
the type of carton to be constructed. The blank 10 consists of
outer side panels 11, 12, 13 and 14, outside bottom panel 15,
intermediate side panels 16 and 17, inside bottom panel 18 and
inner side panels 19, 20, 21 and 22. The bottom panels 15 and 18
are attached to the outer side panels 11 and 13 along a
longitudinal score line 23. The side panels 11, 12, 13 and 14 are
attached along vertical score lines 24, 25 and 26. A score line 27
at one end of the blank defines a flap 28 which will be secured to
the opposite end of the blank in forming the blank into a flat tube
for shipment to customers. It will be understood that other forms
of attachment or joint such as tape can be used. The intermediate
side panels 16 and 17 are attached to the outside bottom panel 15
along the score lines 25 and 26 which are extended below the side
panels. The inner side panels 19, 20, 21 and 22 are attached
respectively to the side panels 11, 12, 13 and 14 along the score
line 29. Extending outwardly from the score lines 24, 25 and 26 are
slots 30, 31 and 32 which separate the inner panels 19, 20, 21 and
22 from each other.
The slots 30, 31 and 32 are so cut that the edge of one panel will
match with the adjacent edge of the next panel. For example, the
projection 31a of panel 20 will match with the indentation 31b of
panel 19. In like manner the outer edges of panels 19 and 22 will
likewise match when the blank is formed into a tube. The purpose of
such matching will be more apparent from the description of the
assembly of the blank to form a box.
After the blank has been formed into a tube (FIG. 2) it can be
shipped flat to the customer, who will set it up into a box by
forming the bottom and folding in the inner side panels. The bottom
illustrated in the drawings can be completed by first folding in
the inside bottom panel 18 (FIG. 3) so that it rests against the
inner surface of panel 11. The intermediate bottom panels 16 and 17
are then folded so that they are flat against the inner face of
outside bottom panel 15 after which such superimposed panels 15, 16
and 17 are folded so that they are flush with the bottom edges of
the side panels (FIG. 4). The intermediate panels 16 and 17 are
then folded upwardly to lie flush against the inner faces of side
panels 12 and 14 after which the inside bottom panel is folded
downward to lie against the inner face of the outside bottom panel
15, thus completing the formation of the bottom (FIG. 5). The
bottom shown herein does not form part of the present invention and
is merely one form of self-locking bottom which can be used in the
box of the present invention. Other forms of self-locking bottoms
can likewise be used. For example, the opposite flaps or panels can
be provided with a tab and slot which can be interlocked. Although
the bottom of a regular slotted carton could be used, it will be
apparent that any such form of bottom formation, which is not
self-locking, will require either stitching, gluing or other
similar means to retain the flaps or panels of the bottom in
position. Since no other equipment or device is necessary to
assemble the box of the present invention, it will be seen that
such other bottom formations are not desirable.
After the bottom has been formed, each of the inner side panels 19,
20, 21 and 22 are folded inwardly so that they lie flat against the
inner faces of the side walls. In the blank illustrated panels 19
and 21 will overlie outer outer side panels 11 and 13 respectively
and panels 20 and 22 will overlie intermediate side panels 16 and
17 respectively. However, if there is a bottom formation in which
there are no intermediate side panels, panels 20 and 22 will
overlie outer side panels 12 and 14. The widths of the slots 30, 31
and 32 and the slot between the inner side panels 19 and 22 is
sufficient to compensate for the thickness of the assembled side
panels but should provide for a tight fit in the corners when the
inner side panels are folded into place. When such panels are
pushed together at the corners the projections on the edge of one
panel fit into the indentations of the adjacent panels. Since the
slots are cut with matching scalloped projections and indentations,
the mating and locking of adjacent projections and indentations is
assured. It will be apparent that such projections and indentations
can be made in various forms and shapes so long as they are
matching. FIG. 8 illustrates a slot 33 with rectangular projections
33a and 33b. Circles, notches, triangles and the like or
combinations thereof are merely examples of other forms.
Since the inner side panels lock along the side corners, such side
panels do not have to extend to the bottom of the box. They can be
any depth into the box without making the locks less effective and
positive.
Handle portions may also be provided for the box as illustrated in
the drawings. Hand holes 34 are die cut in the intermediate panels
16 and 17 and in the inner side panels 20 and 22. Hand holes 35 are
also cut in the outer side panels 12 and 14 but flaps 35a are cut
only on three sides and remain hinged along line 35b. This permits
each flap 35a to be pushed through the holes 34 in the intermediate
and inner side panels to provide a grip surface for the hand
hole.
Thus among others, the several aforenoted objects and advantages
are most effectively attained. Although a somewhat preferred
embodiment of the invention has been disclosed and described in
detail herein, it should be understood that this invention is in no
sense limited thereby and its scope is to be determined by that of
the appended claims.
* * * * *