U.S. patent number 3,853,080 [Application Number 05/300,384] was granted by the patent office on 1974-12-10 for container end and forming method.
This patent grant is currently assigned to National Can Corporation. Invention is credited to Arthur P. Zundel.
United States Patent |
3,853,080 |
Zundel |
December 10, 1974 |
CONTAINER END AND FORMING METHOD
Abstract
This invention relates to a can end construction wherein two
folded countersink portions are provided in opposed contiguous
relationship to each other and the connecting portion bridging such
countersinks is weakened as by scoring. When the weakened score is
ruptured thus removing the central panel, both the raw edges formed
by such rupture are in part protected by folded portions of each
respective countersink. Contacting portions of the opposed
countersinks also may overly and protect the scored line as
well.
Inventors: |
Zundel; Arthur P. (Chicago,
IL) |
Assignee: |
National Can Corporation
(Chicago, IL)
|
Family
ID: |
23158881 |
Appl.
No.: |
05/300,384 |
Filed: |
October 24, 1972 |
Current U.S.
Class: |
413/13 |
Current CPC
Class: |
B21D
51/383 (20130101) |
Current International
Class: |
B21D
51/38 (20060101); B21d 051/26 () |
Field of
Search: |
;113/121C,15A,15R
;220/54,90.6 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Lanham; C. W.
Assistant Examiner: Keenan; M. J.
Claims
I claim:
1. The method of forming a container having a central removable
panel comprising; partially forming a can end blank into a
configuration comprising a horizontal curl portion around the
periphery thereof, a vertical seaming wall connected to an inner
edge of said curl portion, a horizontal first upper run, a first
vertical intermediate run connected thereto at a first foldable
corner, a horizontal lower run in turn connected at one end thereof
to said first intermediate run, a second vertical intermediate run
connected to the other end of said lower run, said second
intermediate run in turn connected to a horizontal second upper
run, at a second foldable corner, forming a weakened line in said
lower run intermediate opposite edges therof and thereafter;
deforming said first and second vertical intermediate runs so that
said intermediate runs are generally parallel to said horizontal
lower run on one side thereof and said first and second foldable
corners are located in close proximity to said weakened line on
opposite sides thereof.
2. The method set forth in claim 1 wherein said weakened line is
formed in the upper portion of said lower run and wherein said
reforming crushes said first and second foldable corners into
deformed contact with each other and overlying said weakened
line.
3. The method of forming a container having a central removable
panel comprising; partially forming a can end blank into a
configuration comprising a horizontal curl portion around the
periphery thereof, a vertical seaming wall connected to an inner
edge of said curl portion, a horizontal first lower run, a first
vertical intermediate run connected thereto at a first foldable
corner, a horizontal upper run in turn connected at one end thereof
to said first intermediate run, a second vertical intermediate run
connected to the other end of said upper run, said second
intermediate run in turn connected to a horizontal second lower
run, at a second foldable corner; forming a weakened line in said
upper run intermediate opposite edges thereof and thereafter;
deforming said first and second vertical intermediate runs so that
said intermediate runs are generally parallel to said horizontal
upper run on one side thereof and said first and second foldable
corners are located in close proximity to said weakened line on
opposite sides thereof.
Description
BACKGROUND OF THE INVENTION
The present invention generally relates to a can end, and more
particularly to a can end in which that portion of the end commonly
known as the countersink or the chuck wall portion of the end is of
greater than single-ply thickness, resulting in a can end sometimes
referred to herein as a "folded countersink end." Such folded
countersink constructions are known and have been utiliized
primarily in the past with closures formed of weaker materials,
such as aluminum or thinner gage tin plate so that such may be more
readily pierced by a can opener. Such closures were previously
subject to buckling ie permanent deformation of the closure at the
periphery of its central panel adjacent to the double seam when
subject to the pressure generated within a can containing a product
such as beer or carbonated beverages. Container ends having such
folded countersink constructions are known and disclosed in such
prior art publications as U.S. Pats. Nos. 1,146,327,dated July 13,
1915; 2,700,355, dated Jan. 25, 1955; and 3,186,583, dated June 1,
1965 and which names the present inventor A. P. Zundel as
patentee.
It has also been proposed in line with the recent trend toward
consumer convenience features which has arisen in all fields of
merchandising, to provide easy open containers of the folded
countersink construction, wherein a manually removable section is
incorporated in the countersink center panel of the top end member.
One such construction is shown in U.S. Pat. No. 3,303,958 issued
Feb. 14, 1967 to W. E. Taylor. In such proposed construction, the
removable section is defined by a score line which, when ruptured
during the opening operation, produces raw edges which remain on
both the container and the removed closure portion. While the raw
edge so produced on the closure end portion remaining on the
container by reason of its connection by the double seam is
protected by reason of its alignment and shielding by the folded
countersink portion, the raw edge present on the detached portion
of the closure remains unprotected.
This unprotected raw edge frequently is objectionable in that it
has a tendency to cut the hand of the consumer and more
particularly if the user of the container is a child then more
seriously the tendency is present for the child to lick contents
such as puddings, toppings, fruits, desserts, etc., remaining on
the underside of the container closure therefrom and thus present
the possibility of tongue, lip and mouth injuries to such child. To
some extent this problem has been alleviated through educational
programs and warning notices placed on the containers by the food
packers and the manufacturers supplying such containers but the
presence of such raw edge remains of concern to such enterprises.
It is also possible that such ends once discarded may be later
picked up or otherwise encountered, e.g., in recycling or sanitary
land fill procedures and accordingly present a secondary hazard in
this manner.
SUMMARY OF THE PRESENT INVENTION
The present invention solves these problems by simultaneously
providing a multi-layered fold in the container end which fold is
located relative to both the periphery of the container end
remaining section an the periphery of the scored removable section
so that not only the raw edge remaining on the container is
protected, but further the raw edge remaining on the removable
container closure is protected as well. Such protection is brought
about by shielding effect produced by disposing folded portions of
the present novel end construction in overlying or underlying
relationship with the raw edge portions produced by the complete
opening thereof.
An object of the invention, therefore, is the provision of a scored
easy open container end which is constructed so as to prevent
injury to both the hand and oral regions of the consumer after the
container has been opened.
A futher object is the provision of such a container end wherein
the raw edge present on the periphery of a container closure which
is produced when the container is opened is effectively shielded by
an adjacent folded portion of the closure.
Still another object of the present invention is the development of
a high speed, reliable and low cost production process for the
formation of the novel container closure construction of the
present invention.
Numerous other objects and advantages of the invention will be
apparent as it is better understood from the following description,
which, taken in connection with the accompanying drawing, discloses
preferred embodiments thereof.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a plan view of the container end embodying the principles
of the present invention;
FIG. 2 is a cross-sectional view on an enlarged scale taken along
the line 2--2 in FIG. 1;
FIG. 3 is a cross-sectional view on an enlarged scale of that
portion of the container end shown in FIG. 2 and shows an
intermediate step in the process of forming the container end
construction shown in FIG. 1 and FIG. 2 of the drawing;
FIG. 4 is a cross-sectional view similar to FIG. 2, but wherein the
removable panel of the container end has been severed from that
portion designed to remain attached to a container body;
FIG. 5 is a schematic view of a can end, showing various regions of
the can end for purposes of illustrating the common terminology
applicable to portions of can ends;
FIG. 6 is a cross-sectional view similar to FIG. 4, but showing a
modified form of the invention; and
FIG. 7 is a cross-sectional view similar to FIG. 2, but showing a
modified form of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Before referring to the invention in greater detail, a number of
terms to be used herein will be defined, it being understood that
such terms are conventional and well known to those skilled in the
can making art. In considering a conventional can end before the
same is affixed, by means of a conventional double seam, to the end
of a container, the following terms are used, and the areas to
which these terms refer are illustrated by the numbers shown in
FIG. 5.
Thus, the outermost curve is referred to as the curl 20 and
proceeding inwardly as shown in FIG. 5, the following areas
respectively are encountered: a seaming panel 22, a seaming panel
radius 24, a chuck wall 26, a chuck wall radius 28, a chuck panel
30, a chuck panel radius 32, and a bead 34. It will thus be
understood that portions of such construction conventional, namely
the bead 34, may be eliminated when utilizing the construction of
the present invention.
Referring now in greater detail to the drawing, FIG. 1 shows a can
end 36 attached to a conventional cylindrical can body by means of
a conventional double seam construction. The can end 36 is provided
with a central panel 38 which is designed for complete removal from
the container to which the can end is joined. The periphery of the
central panel 38 is defined by a circular score line or weakened
portion 40 formed in the can end 36 in a manner which will be
hereinafter more fully brought out. A ring pull 42 is affixed to
the central panel 38 and is positioned so that the point 44 thereof
is located slightly above end line with a segment of the score line
40 so that an upward pivotal pull on a direction towards the edge
of the container on the ring portion 46 of the ring pull 42 will
force the point 44 through the remaining portions of the score line
and thus initially and partially sever the central panel 38 from
the peripheral ring portion 48 of the can end 36. Subsequent direct
upward force on the ring pull serves to completely sever the
central panel 38 from ring portion 48. The ring pull is attached to
the central panel by means of a rivet 50 as is well known in the
art.
The peripheral ring portion 48 is composed of a curl 52 and a
seaming panel 53 contiguous thereto and which together with
peripheral portion of the container will form the means by which
the can end 36 is double seamed to the container. Connected to the
seaming panel 53 is a first countersink 55 by means of a chuck wall
54. Such countersink 55 may be located directly beneath the chuck
wall 54 as shown thus assuring proximate positioning thereof to the
container wall or may be alternatively spaced therefrom by a
connecting portion (not shown) of the peripheral ring portion
48.
The countersink 55 includes an upper run 58 and a lower run 60
connected to each other by means of an intermediate or reverse run
62. The U-shaped connecting portions joining runs 58 and 60 to run
62 are respectively designated as folds 59 and 61. The runs 58, 62
and 60 are disposed in generally parallel planes directed generally
normal to the plane of the chuck wall 54 and further being
generally parallel with the major extent of the can end 36. Runs 58
and 62 and runs 62 and 60 respectively are also in closed contact
with each other.
The lower run 60 in turn extends inwardly of the first countersink
and in part forms the lower run 64 of a second countersink 65 which
in turn is located inwardly of countersink 55 and in opposed
position thereto. Countersink 65 includes in additon to lower run
64 an upper run 66 and an intermediate or reverse run 68 inter
connected to each other by means of a U-shaped fold 67. Such
reverse run 68 is in turn connected to the lower run 64 by means of
a U-shaped fold 69.
Turning now to FIG. 7 of the drawing a modified form of the
invention is shown wherein the uninterrupted connecting portion 70
joining the separate countersinks 55 and 65 from each other is
disposed uppermost in contrast to its lowermost disposition in FIG.
2 of the drawing. In such modified form the countersink 55 includes
an upper run 58' and a lower run 60' connected to each other by
means of an intermediate or reverse run 62'. The U-shaped
connecting portions joining runs 58' and 60' to run 62' are
respectively designated as folds 59' and 61'. The runs 58', 62',
and 60' are disposed in generally parallel planes directed
generally normal to the plane of the chuck wall 54 and further
being gnerally parallel with the major extent of the can end 36.
Runs 58' and 62' and runs 62' and 60' respectively are also in
closed contact with each other.
The upper run 58' in turn extends inwardly of the first countersink
and in part forms the upper run 66' of a second countersink 65
which in turn is located inwardly of countersink 55 and in opposed
position thereto. Countersink 65 includes in addition to upper run
66' includes a lower run 64' and an intermediate or reverse run 68'
inter connected to each other by means of a U-shaped fold 67'. Such
reverse run 68' is in turn connected to the lower run 64' by means
of a U-shaped fold 69'.
The disposition of the countersinks 55 and 65 is such that their
respective lower runs 60 and 64 in the form of the invention shown
in FIG. 2 and respective upper runs 58' and 66' in the form of the
invention shown in FIG. 7 form an essentially straight
uninterrupted connecting portion 70 between the two countersinks.
The score line 40 is provided in the connecting portion 70 and
located intermediate thereof and as previously described comprises
the mechanism by which the ring portion 48 and central panel 38
segments of the can end 36 are separated from each other. Such
separation which occurs by the breaking of those remaining portions
of connecting portion 70 lying opposite the score 40 also
necessarily separates countersinks 55 and 65 from each other,
countersink 55 remaining with the container and countersink 65
remaining with the removable portion of the can end.
The tearing of score 40 results in raw edges 72 and 84 being formed
at the terminal points of lower runs 60 and 64 respectively as best
shown by FIG. 4 of the drawing. It should be pointed out that
severing of the score 40 in the modified form of the invention
shown in FIG. 7 of the drawing also results in raw edges 72 and 74
produced at the terminal points of upper runs 58' and 66'
respectively. Such raw edges, however, by reason of their proximate
positioning to folds 59 or 59' and 67 or 67' respectively are
protected thereby. Thus in any contact across the severed portion
of either the peripheral ring portion 48 of the container as by
reaching into the container to spoon out contents or the central
panel 38 as by scraping any contents adhering thereto therefrom,
the potential for cutting injury to the user is eliminated or its
severity effectively reduced by the shielding effect of the folds
59 or 59' and 67 or 67' respectively.
Turning now to FIG. 3 of the drawing, the novel method by which one
form of double countersink end is produced is best shown. FIG. 3
depicts a portion of a can end blank prior to folding into the
configuration of FIG. 2 wherein the metal constituting the blank
has been partially shaped so as to present a generally vertical
orientation to the intermediate or connecting runs 62 and 68 of
countersinks 55 and 65 respectively while permitting connecting
portion 70 to remain essentially horizontally. This intermediate
configuration permits horizontal tooling support of and ready
vertical access to the connecting portion 70 and thus enables
scoring tooling to produce score 40 therein without reducing high
speed sequential formation of the present can end construction. The
can blank after scoring in score 40 and as shown in FIG. 3 is then
folded into the configuration shown in FIG. 4 in a futher step of a
multiple station metal forming press which are commercially
available. While no detailed description of the intermediate
configuration necessary for the production of the embodiment
depicted in FIG. 7 of the drawing is included, it should be brought
out that such is essentially similar to that shown in FIG. 3 except
that the connecting portion 70 is upwardly stepped from the main
surface of the can end 36.
It should be pointed out that such configuration also permits the
score 40 to be formed anywhere along the intermediate extent of
connecting portion 70, thus enabling more or less protection to be
given to either of the raw edges produced upon opening. Thus if it
is desired to more completely protect the raw edge 74 remaining on
the removable central panel 38 then the score 40 may be shifted to
the right of its central portion depicted in the drawings and such
alternate position would in turn place protecting fold 67 outwardly
of raw edge 74 as shown in FIG. 6 of the drawing. This construction
is particularly useful in conjunction with individual serving
pudding cans and the like wherein there is a greater likelihood of
cutting occurring from the removed end than that portion of the end
remaining attached to the container.
Another important feature of the invention is the protection
afforded the score 40 by the overlying positioning of upper runs 58
and 66 wherein the folds 59 and 67 thereof are brought into
intimate contact with each other upon the bending or crushing of
the can blank shown in FIG. 3 to the completed end construction
shown in FIG. 4. Such bending action may also include a deformation
of the folds 59 and 67 so as to assure intimate engagement there
between and thus provide protection to the score 40 from dirt,
corrosive or weakening atmospheric conditions, and direct physical
shock from shipment and handling.
It is thus apparent that the present can end construction and its
novel method of production meet the objects of the inventions set
out herein above and that the can end construction affords a
considerable edge in safety over prior art constructions and
furthermore presents a more aesthetically pleasing and functionally
stronger and cleaner end.
It is apparent that the various modifications above described and
shown e.g. score line placement, apply equally in regard to the
embodiments shown in FIGS. 2 and 7 of the drawing. It will also be
apparent that various changes may be made in the form, construction
and arrangement of the preferred embodiments disclosed herein, may
be made without departing from the spirit and scope of the
invention as set forth and claimed as follows.
* * * * *