U.S. patent number 3,616,987 [Application Number 05/015,331] was granted by the patent office on 1971-11-02 for carton with reclosable corner portion.
This patent grant is currently assigned to Milprint, Inc.. Invention is credited to Robert A. Krzyzanowski.
United States Patent |
3,616,987 |
Krzyzanowski |
November 2, 1971 |
CARTON WITH RECLOSABLE CORNER PORTION
Abstract
A carton, and a blank therefor, including a wraparound corner
locking flap construction comprising a T-shaped first element
joined to part of the carton and two other elements joined to
another part of the carton. Reclosure after the initial opening of
the carton is obtained by engagement of the T-shaped element with
the other locking elements. The construction of the wraparound
corner locking flap is of a particular configuration which will
give especially effective reclosure of a carton having a wall panel
with a corner portion which can be articulated about a diagonal
fold line formed in such wall panel.
Inventors: |
Krzyzanowski; Robert A.
(Milwaukee, WI) |
Assignee: |
Milprint, Inc. (Milwaukee,
WI)
|
Family
ID: |
21770797 |
Appl.
No.: |
05/015,331 |
Filed: |
March 2, 1970 |
Current U.S.
Class: |
229/231;
229/131 |
Current CPC
Class: |
B65D
5/701 (20130101) |
Current International
Class: |
B65D
5/70 (20060101); B65d 005/42 () |
Field of
Search: |
;229/44R,17R,51SC,51TC,7R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Leclair; Joseph R.
Assistant Examiner: Marcus; Stephen
Claims
I claim:
1. In a carton blank for assembly into a rectangular container
having first and second side walls hinged to opposite sides of an
end wall, the improvement comprising the combination therewith
of:
1. a closure flap hinged to the first sidewall along a first fold
line and adapted to extend to the second sidewall,
a. a diagonal fold line defined in the closure flap to form a
movable corner portion thereof,
b. a first skirt panel hinged to a first side of the corner portion
and adapted to extend over the end wall when the blank is assembled
into a carton,
c. a second skirt panel hinged to a second side of the corner
portion at right angles to the first side and adapted to extend
over the second sidewall when the blank is assembled into a
carton,
2. a wraparound corner locking panel hinged to the end wall and to
a portion of the second sidewall along the first fold line,
a. a severance line dividing the corner locking panel into a
generally T-shaped locking flap having its central section
connected to the first fold line and a pair of locking tabs hinged
to the first fold line,
b. the corner locking panel adapted to be positioned between the
skirt panels of the movable corner portion and the end wall and
second sidewall when the blank is assembled into a carton.
2. A carton blank according to claim 1, wherein:
the severance line in the corner locking panel has a central
portion arranged along the first fold line, a first leg extending
from each end of the central portion about halfway across the
panel, and a second leg extending from the end of each first leg to
the adjacent edge of the corner locking panel.
3. In a carton having first and second sidewalls connected by end
walls to define a container body, the improvement comprising the
combination therewith of:
1. a top closure flap connected to one of the sidewalls and
extending across the top of the carton, a diagonal fold line
defined across a corner of the top closure flap to form a movable
corner portion thereof, a skirt panel depending from each side of
said movable corner portion, with one of the skirt panels extending
over one end wall of the carton and the other extending over a
sidewall of the carton,
2. a corner locking panel hinged to the top edge of said one end
wall and an adjacent sidewall and being positioned between said
depending skirt panels and the carton walls, the corner locking
panel including a severance line dividing it into a central
T-shaped locking flap and two locking tabs, the T-shaped locking
flap having its central section connected to the top edge of the
carton and being adhered to said depending skirt panels of the
corner portion.
Description
BACKGROUND OF THE INVENTION
1. Field
This invention relates to the field of cartons having a movable
corner portion of the type adapted to provide an open corner
through which packaged contents can be dispensed.
2. Prior Art
Although various types of reclosable cartons having a locking
construction formed by coacting elements carried between the body
of the carton and a cover of the carton are known, the prior art
constructions have generally been suitable only for a trunk-style
carton wherein an entire top wall is moved in order to achieve
opening. The reclosure obtained with such constructions has usually
been only single-edge contact between the cooperating locking
elements. Normally, the locking structure has been attached either
to only one wall of the carton or on two parallel sidewalls of the
carton. For these reasons, the known carton constructions employing
reclosure structure similar to that of the carton of the present
invention have been unsatisfactory for or failed to achieve maximum
effectiveness with a carton of the type having a movable corner
portion.
SUMMARY OF THE PRESENT INVENTION
My present invention relates to a carton having a movable corner
portion of one of its walls, skirt panels depending from two edges
of the movable corner portion to overlie intersecting walls of the
carton at a corner of the carton body, and a wraparound corner
locking panel which in its initial condition is folded over two
intersecting walls of the carton to underlie the skirt panels
depending from the movable corner portion. The corner locking panel
is divided into three sections: a central T-shaped flap and a pair
of locking tabs or ears, with the T-shaped flap being joined to the
skirt panels of the corner portion and the locking tabs joined to
the body of the assembled carton. The T-shaped flap is joined to
the two locking tabs before the carton is opened but upon opening,
the T-shaped flap separates from the two locking tabs along a
severance line defined in the corner locking panel. After part of
the contents of the package is used, reclosure is obtained by
folding the corner portion downwardly so that the T-shaped locking
flap engages the two locking tabs along a side and end edge
thereof.
One of the main objects of my invention is to provide a carton with
a movable corner portion which can be used as a pour spout and
which can be easily reclosed by engagement of structure carried by
the movable corner portion with other structure remaining attached
to the body of the carton. A further object is to provide a
reclosable carton with a corner pour spout construction embodying a
T-shaped panel as one of the locking elements adapted to cooperate
with two other elements attached to intersecting walls of the
carton to thereby provide a strong, rigid but effective reclosure
corner construction. A more specific object is to provide the
particular carton and blank constructions hereinafter specifically
claimed.
DESCRIPTION OF THE DRAWINGS
The present invention is described herein with reference to the
accompanying drawings which illustrate a presently preferred
embodiment. The drawings are meant to illustrate, not limit, this
invention inasmuch as it is anticipated that those skilled in the
art will be able to devise changes from the illustrated embodiment
that will remain within the true scope of this invention and it is
intended to embrace all such changes within the scope of the
claims. In the drawings:
FIG. 1 is a plan view of a carton blank constructed in accordance
with this invention;
FIG. 2 is a perspective view of a carton assembled from the blank
of FIG. 1;
FIG. 3 is a partial perspective view illustrating the carton with
its movable corner portion in its closed condition;
FIG. 4 is a partial perspective view illustrating the movable
corner portion in its open condition; and
FIG. 5 is a view partly in section and partly broken away which
illustrates the reclosure action obtained with the carton
construction of this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 illustrates a sheet of carton material cut and scored to
define a carton blank 1 wherein spaced horizontal fold lines 2 and
3 and spaced vertical fold lines 4, 5, 6 and 7 divide the blank
into sidewall 8, end wall 9, sidewall 10, end wall 11 and glue flap
12. The vertical fold lines 4-7 extend between the two horizontal
fold lines 2 and 3. At the bottom of the blank 1, closure flap 13
is hinged to sidewall 8, end closure flap 14 is hinged to end wall
9, closure flap 15 is hinged to sidewall 10, and end closure flap
16 is hinged to end wall 14, with fold line 3 forming the hinged
connection between the foregoing wall panels. Closure flap 15
includes ears 17 and 18 connected to its main panel along short
fold lines 19 and 20 respectively, formed as extensions of vertical
fold lines 5 and 6. At the top edge of blank 1, end closure flap 21
is hinged to end wall 11 and closure flap 22 is hinged to sidewall
10, both flaps being hinged to their respective walls along
horizontal fold line 2. Flap 22 includes ear 23 hinged thereto
along fold line 24 extending from vertical fold line 6.
The present invention relates to the configuration, and locking
function achieved thereby, of the top closure flap 25 and
wraparound corner locking panel 26. The flap 25 is hinged to
sidewall 8 along horizontal fold line 2 and the corner locking
panel 26 is hinged to end wall 9 and a portion of sidewall 10 along
horizontal fold line 2.
The top closure flap 25 is formed as a rectangular panel including
a diagonal fold line 30 extending from a corner of the flap 25
(adjacent end wall 9 along the fold line 2) across to its outer
edge at a 45.degree. angle to thereby define a movable corner
portion 31 of the flap 25. A foldable skirt panel 32 is connected
to one side of the corner portion 31 along fold line 33, which is
an extension of fold line 4, and a similar skirt panel 34 is
connected to the other side of the corner portion 31 along fold
line 35 which is aligned with the outer edge of the flap 25.
The corner locking panel 26 is hinged to the horizontal fold line 2
and is twice as long as the width of the end wall 9 for the purpose
hereinafter explained and includes a center fold line 36 extending
from the vertical fold line 5. Panel 26 is divided into a generally
T-shaped locking flap 37 and locking tabs 38 and 39 along a
severance line 40 which includes a central section 41 disposed
along the horizontal fold line 2, vertical legs 42 and 43 extending
from each end of the section 41 about halfway across the panel 26,
and horizontal arms 44 and 45 extending from the ends of each leg
42 and 43, respectively, outwardly to the inclined side edges of
the locking panel 26.
FIG. 2 illustrates a carton assembled from the blank 1 formed upon
folding the panels 8, 9, 10 and 11 about their respective vertical
fold lines, and folding the glue flap 12 inwardly and joining it,
as by a suitable adhesive, to the inner edge portion of the
sidewall 8, thereby forming a rectangular carton. The bottom
portion is closed by folding the end closure flaps 14 and 16
inwardly across the open bottom, then folding the closure flap 13
over the two end flaps, joining them to the flap 13 by adhesive if
desired, and thereafter folding the closure flap 15 over and
joining it to the flap 13 while at the same time folding the ears
17 and 18 over and joining them to the end walls 9 and 11
respectively. The wraparound corner locking panel 26 is folded
downwardly about the fold line 2 so that it lies over the end wall
9 and a portion of the sidewall 10. Closure of the top of the
carton is obtained by first folding end closure flap 21 inwardly
and then folding closure flap 22 over part of the top end of the
carton, joining flap 21 to flap 22 by means of adhesive if desired,
and gluing ear 23 of flap 22 to the upper portion of the end wall
11. The final step is to fold over the top closure flap 25 and join
it to the closure flap 22, this final condition being illustrated
in FIG. 3. Skirt panels 32 and 34 are each adhesively secured to
the T-shaped flap 37 of the locking panel 26 by means of adhesive
as indicated by the stippling of the flap 37 in FIG. 2.
The carton, of course, is filled with the commodity which is to be
packaged therein prior to achieving the final closure, it usually
being preferable to complete the top closure first, load the carton
through the open bottom, and then close the bottom end after
loading is completed. The carton of this invention may be used to
package both food and nonfood items, such as soap powder, cereal,
granular products in general, snack food items, etc. The packaged
contents can be contained inside the carton directly or in a liner
or interior bag carried inside the carton if the packaged materials
need special protection.
The user opens the carton by grasping the skirt panels 32 and 34 of
the movable corner portion and pulling the corner portion upwardly
about the diagonal fold line 30. This opening action severs the
wraparound corner locking panel 26 into two sections along the
severance line 40 formed therein to obtain the condition
illustrated in FIG. 4. It will be noted from FIG. 4 that the
locking tabs 38 and 39 remain attached to the body of the carton
whereas the T-shaped locking flap 37 remains adhered to the skirt
panels 32 and 34 attached to the movable corner portion 31. This
provides an open corner of the carton which is used as a dispensing
opening through which the contents of the carton can be poured.
When only a portion of the contents packaged in the carton is to be
dispensed, the user can reclose the carton by moving the corner
portion 31 and its attached skirt panels 32 and 34 downwardly to
its original position as illustrated in FIG. 3. The corner portion
will be held in this position by the locking action achieved
through engagement of the T-shaped locking flap 37 adhered to the
skirt panels 32 and 34 with the locking tabs 38 and 39 that remain
attached to the body of the carton. Referring now to FIG. 5, upon
closure of the corner portion the T-shaped flap 37 will engage the
end and lower edge of each of the tabs 38 and 39 to secure the
corner portion in place. As indicated with reference to tab 38, the
lower arm of the T-shaped flap 37 engages the bottom edge 50 of the
tab 38 and the edge of the central portion of the T-shaped locking
flap 37 engages the end 51 of the tab 38. The end and bottom edges
of the ear 39 will be engaged in the same fashion.
The locking action achieved upon reclosure of the corner portion as
described above provides for effective yet rapid reclosure of the
carton. Because the T-shaped flap 37 is attached to skirt panels of
the movable corner portion, a strong rigid double-layer locking
element is formed. The flap 37 is used as a structural member to
hold the skirt panels in the desired configuration, in addition to
its function as part of the locking structure. Furthermore, when in
the reclosure position, the T-shaped locking flap 37 engages or
surrounds the two locking tabs 38 and 39 along two of their sides
so that it is impossible not to achieve the desired locking
engagement between the flap 37 and tabs 38, 39. The central section
of the T-shaped locking flap 37 remaining connected to the corner
portion of the top further adds strength and rigidity to the
reclosure structure, in distinction to the type of locking action,
achieved in which one flap may extend horizontally without being
connected to the corner portion about a central section. The
locking action is an improvement over that wherein there is only a
single edge engagement utilized between the two elements of the
locking structure. Also, the fact that locking is achieved on two
walls of the carton rather than only one wall seems to enhance the
reclosure action.
The carton and the blank therefor as described herein can be formed
of any suitable carton material typically used in the converting
art such as paperboard, cardboard, plastic material, etc. The
material may be uncoated or include a functional coating such as a
barrier coating, heat seal coating, etc. and may be of single layer
or multiple layer construction. The several panels and flaps can be
cut from the material of the blank by the usual converting
diecutting operations, and the fold lines and severance lines can
be formed therein by suitable scoring, creasing, slitting or
perforating operations. The term fold line as used herein is
defined as any construction along which the material of the blank
can be hinged or articulated and includes a continuous crease
extending partly through the material, a series of slits extending
partially or entirely through the material, etc. A severance line
as used herein means any construction along which the panel or flap
can be separated and can be a line of perforations, a line of short
or long slits interrupted by short portions of the carton material
or similar constructions. As mentioned previously, the carton of
this invention is useful for the packaging of a variety of both
food and nonfood items and can be combined with an interior liner
or inner pouch. A convenient manner of supplying the carton blank
to a packager is by folding the blank about the fold lines 4 and 6,
joining glue flap 12 to the side wall 8, and folding the locking
panel 26 over the walls 9 and 10; this forms a flattened sleeve
which the packager can open quickly, close the top, fill through
the open bottom and then close the bottom to complete the container
enclosure.
* * * * *