U.S. patent number 3,874,553 [Application Number 05/380,990] was granted by the patent office on 1975-04-01 for easy opening can end with embossed panel.
This patent grant is currently assigned to Aluminum Company of America. Invention is credited to James R. Morran, Fred R. Schultz.
United States Patent |
3,874,553 |
Schultz , et al. |
April 1, 1975 |
Easy opening can end with embossed panel
Abstract
A can end is provided which has a circular score in it defining
a removable panel, a rigid pull tab attached to the removable panel
adjacent the score line, and an X-shaped embossment in the
removable panel to control bending of the panel during removal.
Inventors: |
Schultz; Fred R. (Lower
Burrell, PA), Morran; James R. (New Kensington, PA) |
Assignee: |
Aluminum Company of America
(Pittsburgh, PA)
|
Family
ID: |
23503247 |
Appl.
No.: |
05/380,990 |
Filed: |
July 19, 1973 |
Current U.S.
Class: |
220/273; D9/438;
220/276 |
Current CPC
Class: |
B65D
17/4011 (20180101); B65D 2517/0079 (20130101) |
Current International
Class: |
B65d 017/20 () |
Field of
Search: |
;220/54,48,72,74,27 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Hall; George T.
Attorney, Agent or Firm: Brownlee, Esq.; David W.
Claims
What is claimed is:
1. In an easy opening can end having a circular score line therein
defining a removable panel and a substantially rigid pull tab
attached to the removable panel adjacent the score line, the
improvement comprising an X-shaped embossment substantially
centered in the removable panel and the centerline of the tab
substantially bisecting the included angle between two legs of the
embossment.
2. An easy opening can end as set forth in claim 1 in which a
downwardly embossed finger well is located in the center of said
embossment.
3. An easy opening can end as set forth in claim 2 in which said
finger is substantially square and the legs of the embossment
extend radially from the corners of the finger well.
4. An easy opening can end having a circular score line defining a
removable panel and a tab attached to the removable panel near the
score line, and further having an X-shaped embossment substantially
centered in the removable panel and oriented so that a diametrical
line drawn through the means for attaching the pull tab to the
removable panel bisects the included angle between two legs of the
embossment.
5. An easy opening can end as set forth in claim 4 in which said
tab is substantially rigid.
6. An easy opening can end as set forth in claim 4 in which the
legs of said embossment have included angles of approximately
90.degree.therebetween.
7. An easy opening can end as set forth in claim 4 in which the
legs of the embossment extend outwardly to within close proximity
of said score line.
8. An easy opening end as set forth in claim 4 in which said
embossment is formed downward in the end.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to easy opening can ends, and in particular
to a can end having means therein to facilitate severance of a
removable panel from the can end.
2. Description of the Prior Art
It is known to provide reinforcement means such as ribs and/or
embossments in a removable panel in a can end to either control or
prevent bending of the panel during opening as is disclosed in U.S.
Pat. Nos. 3,430,802; 3,478,918; 3,591,037 and 3,653,536 among
others. Additionally, U.S. Pat. No. 3,441,171 discloses a
rectangular embossment in the center of a rectangular removable
panel and arcuate indentations adjacent each corner of the
embossment to reduce flexure of the panel portion. U.S. Pat. No.
3,662,916 is also of interest for its disclosure of a relatively
large V-shaped embossment in a circular removable panel.
The prior art is lacking in the disclosure of means in a circular
full, pull-out removable panel for obviating the necessity to hold
the center of the panel down with the thumb or the like during
removal of the panel.
SUMMARY OF THE INVENTION
This invention provides an easy opening can end having a circular
score defining a removable panel, a rigid pull tab attached to the
removable panel, and an X-shaped embossment in the removable panel
to control bending of the panel during removal thereof.
Accordingly, an object of this invention is to provide means in a
removable panel for controlling bending of the panel during
opening.
Another object of the invention is to provide a can end having a
removable panel with an X-shaped embossment therein to obviate the
need to hold the center of the panel down during removal
thereof.
Other objects and advantages of this invention will be more fully
understood and appreciated with reference to the following
description and the drawings appended hereto.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a top plan view of a can end of the invention,
FIG. 2 is a cross-sectional view through the can end of FIG. 1
secured on a can,
FIG. 3 is a perspective view illustrating initiation of opening of
a can end of the invention,
FIG. 4 is a cross-sectional view illustrating initiation of opening
of a can end of the invention, and
FIG. 5 is a cross-sectional view illustrating completion of opening
of a can end of the invention.
DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
FIGS. 1 and 2 illustrate a metal can end 10 of the invention which
is preferably made of aluminum or an alloy thereof, and which has
been seamed on a can body 12 by conventional methods. Can end 10
includes a raised peripheral flange 16 therearound which has been
seamed onto the can body, a score line 18 defining a circular
removable panel 20 and a rigid pull tab 22 attached by means of an
integral rivet 24 to the removable panel adjacent the score line.
Can end 10 may further include an anti-fracture score, not shown,
which runs parallel to score line 18 as is well known in the
art.
In accordance with this invention, removable panel 20 in can end 10
includes an X-shaped embossment 26 located centrally in the panel
to control bending thereof during severance of the panel from the
can end. A square finger well 30 may be located in the center of
the embossment to facilitate gripping of tab 20 and to further
reinforce the panel. In the embodiment selected for illustration,
embossment 26 is formed downwardly in removable panel 20 or toward
the inside of can 12, but it can also be formed upwardly in the
panel if desired. Legs 28 of embossment 26 preferably extend
radially outwardly from the corners of finger well 30 to within
relatively close proximity of score line 18 around removable panel
20. Legs 28 preferably have approximately 90.degree. included
angles therebetween, but this is not considered to be critical.
In a preferred embodiment of the invention, a diametrical line
drawn through rivet attachment 24 bisects the included angle
between legs 28 of embossment 26 so that the two legs of the
embossment adjacent rivet 24 diverge outwardly along opposite sides
or the rivet. In can end 10, this means that the center line or
longitudinal axis of tab 22 also bisects the included angle between
the legs of the embossment, but other orientations of the tab will
be apparent to those skilled in the art. For example, there are
other tabs which could be used on a can end of the invention which
are attached to can end in biased orientation with respect to the
peripheral edge of the can end. With such tabs, the longitudinal
axis of the tab would not bisect the included angle between legs 28
of embossment 26.
To open a can end of the invention, the handle end of tab 22 is
first lifted to depress the portion of removable panel 20 which
underlies the nose end of the tab and thereby rupture score line 18
adjacent the rivet attachment. When tab 22 is so lifted, a bend
line 38 is formed in removable panel 20 across the panel behind
rivet 22 which results in a down-turned flange 32 on the removable
panel as is illustrated in FIG. 3. Flange 32 provides stiffening to
removable panel 20 as tab 22 is further pulled to progressively
rupture the score line 18 around both sides of removable panel
20.
When tab 22 on can end 10 is pulled to rupture score line 18 around
the remainder of removable panel 20, it is not necessary to hold
the center of the panel down as has been required with most prior
art can ends. If downward pressure were not applied against the
center of such heretofore known can ends, the removable panels
frequently domed upwardly placing the score line in tension rather
than in shear as is desired for easy rupture of the score. Some
prior art can ends have included reinforcing means therein such as
ribs or the like to help prevent doming of the can end while
permitting the removable panel to bend along lines transverse to
the center line of the tab, but such reinforcing means have not
been totally effective.
When tab 22 on can end 10 having an X-shaped embossment 26 in its
removable panel 20 is pulled, a triangular-shaped lever section 36
is formed between depressed flange 32 and legs 28 of embossment 26
and such lever section is fulcrumed or pivoted about a point 34
near the center of the removable panel 20. This pivoting of
triangular-shaped lever 36 about the center of the panel
progressively lifts the starting end of removable panel 20 to
progressively shear score 18 in opposite directions along both
sides of the removable panel. Such pivoting or fulcruming of the
starting portion of the removable panel greatly facilitates
severence of score line 18 and obviates any need to depress the
center of the panel during such opening. After opening has been
initiated by rupturing score 18 around the starting end of
removable panel 20, tab 22 can be further pulled to complete
rupture of the score around the complete circumference of the
removable panel, as is illustrated in FIG. 5, to separate the panel
from the can end and can.
From the above description and the drawings appended hereto, it is
seen that this invention provides a can end with means for
facilitating rupture of the score around a removable panel in the
can end by controlling bending of the panel. Although a preferred
embodiment of the invention has been selected for illustration and
description, it will be apparent to those skilled in the art the
numerous modifications can be made in the can end without departing
from the invention and the scope of the claims appended hereto.
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