U.S. patent number 3,749,275 [Application Number 05/212,562] was granted by the patent office on 1973-07-31 for lock-down for a pull tab on a container wall.
This patent grant is currently assigned to Aluminum Company of America. Invention is credited to Hans H. Diekhoff, George L. Smith, Jr..
United States Patent |
3,749,275 |
Smith, Jr. , et al. |
July 31, 1973 |
LOCK-DOWN FOR A PULL TAB ON A CONTAINER WALL
Abstract
An easy opening device is provided which includes a score line
in the container wall defining an opening flap adjacent an edge of
the container wall and a tab having a nose end overlying the
opening flap and affixed thereto and a handle end toward the
opposite edge of the container wall with a line of weakening in the
tab between its nose and handle ends for depressing the handle end
of the tab to a non-obstructing position on the container wall, and
which further includes an upwardly embossed hook in the container
wall for engagement over an edge portion of the handle end of the
tab to restrain it in a non-obstructing position on the container
wall. A method of forming an embossed hook for engaging a tab is
also provided.
Inventors: |
Smith, Jr.; George L.
(Vandergrift, PA), Diekhoff; Hans H. (Greensburg, PA) |
Assignee: |
Aluminum Company of America
(Pittsburgh, PA)
|
Family
ID: |
22791541 |
Appl.
No.: |
05/212,562 |
Filed: |
December 27, 1971 |
Current U.S.
Class: |
220/269 |
Current CPC
Class: |
B65D
17/4012 (20180101) |
Current International
Class: |
B65D
17/00 (20060101); B65d 017/00 () |
Field of
Search: |
;220/54,48,27,47 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Hall; George T.
Claims
What is claimed is:
1. In an easy opening device in a sheet metal container wall
including a score in the container wall defining an opening flap,
and further including a tab with a nose portion and a handle
portion and weakening line therebetween, the nose portion of the
tab overlying the opening flap and affixed thereto; the improvement
comprising,
said container wall having an integral hollow upwardly embossed
hook with an outwardly projecting rounded nose thereon near its top
for engaging an edge of the handle end of the tab to restrain it in
a non-obstructing position on the container wall after a pouring
orifice has been formed in the container wall and the handle end of
the tab has been depressed against the container wall.
2. An easy opening device as set forth in claim 1 in which said tab
has a relatively large aperture in its handle end and said hook is
located on the container wall for engagement over an inside edge of
the tab around the aperture distal the nose end of the tab.
3. An easy opening device as set forth in claim 2 in which said
hook is located on the container wall for engagement of an edge of
the tab on a radial line which extends from approximately the
center of the aperture in the tab at approximately a 45.degree.
angle to the longitudinal axis of the tab toward the outer end of
the tab.
4. In an easy opening device in a sheet metal container wall
including a score line in the container wall defining an opening
flap, a pull tab attached to the flap and means for depressing at
least a portion of the pull tab to a non-obstructing position on
the container after opening, the improvement comprising an integral
hollow upwardly embossed hook with an outwardly projecting rounded
nose near its top on the container wall for engagement over an edge
portion of the tab to restrain it adjacent the container wall.
Description
BACKGROUND OF THE INVENTION
It is known to provide easy opening devices with pull tabs thereon
which remain attached to a container wall after opening in order to
reduce litter problems which may be caused by small tabs which are
sometimes carelessly discarded. For example, U.S. Pat. No.
3,618,815 illustrates and describes an easy opening device
comprising a V-shaped opening flap in a container wall and a tab
attached to the opening flap for depressing the flap into a
container on which the easy opening device is attached. The tab on
this easy opening device has a nose end and a handle end with a
weakening line therebetween so that, after opening, the handle end
of the tab can be depressed to a non-obstructing position on a
container wall without closing the pouring orifice which has been
formed. U.S. Pat. No. 3,618,815 discloses no means for retaining
the handle end of the tab in a non-obstructing position on a
container end after opening. Means for retaining a non-severable
tab in a non-obstructing position on a container are disclosed in a
number of United States patents including U.S. Pats. Nos.
3,269,586; 3,386,613; 3,420,398 and 3,442,416.
SUMMARY OF THE INVENTION
This invention provides an improvement upon an easy opening device
with a non-removable tab such as that which is illustrated and
described in U.S. Pat. No. 3,618,815, which improvement comprises
means on the container end wall for engaging the handle end of a
tab and restraining it in a non-obstructing position on a container
wall. In a preferred embodiment of the invention, such means
comprises an embossed hook configuration which is engageable over
an edge of the handle end of a tab. A method of forming such an
embossed hook is also provided.
Accordingly, an object of the invention is to provide an easy
opening device having a tab which remains on a container end wall
after opening and means on the container wall for restraining the
handle end of the tab in a non-obstructing position.
Another object of the invention is to provide a non-removable easy
opening device which includes an embossed hook means in a container
wall for engaging over an edge portion of the handle end of a tab
to hold such handle end in a non-obstructing position on the
container wall.
Another object of the invention is to provide a method of forming
an embossed hook means in a container wall for engaging over an
edge portion of a tab to hold the tab in non-obstructing position
on the container wall .
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects and advantages of the invention will be
more fully understood and appreciated with reference to the
following description and the drawings appended hereto wherein:
FIG. 1 is a top plan view of a container wall of the invention with
an embossed hook means thereon for engaging the handle end of a tab
on the container wall;
FIG. 2 is a cross-sectional view taken along line II--II of FIG.
1;
FIG. 3 is a top plan view of the container wall of FIGS. 1 and 2
after opening;
FIG. 4 is a cross-sectional view taken along lines IV--IV of FIG.
3;
FIG. 5 is a fragmentary cross-sectional view illustrating a first
step in forming an embossed hook means;
FIG. 6 is a fragmentary cross-sectional view illustrating tools and
a container wall preparatory to a second step in forming an
embossed hook means;
FIG. 7 is a plan view of the punch of FIG. 6;
FIG. 8 is a side view of the punch of FIG. 6;
FIG. 9 is an end view of the die of FIG. 6;
FIG. 10 is a fragmentary cross-section similar to FIG. 6 subsequent
to the second forming step;
FIG. 11 is a fragmentary cross-sectional view illustrating tools
and a container preparatory to a third step in forming an embossed
hook means;
FIG. 12 is an end view of the punch of FIG. 11;
FIG. 13 is a side view of the punch of FIG. 11; and
FIG. 14 is a fragmentary cross-sectional view similar to FIG. 11
subsequent to the third forming step.
DESCRIPTION OF A PREFERRED EMBODIMENT AND MODE OF MAKING
A preferred embodiment of a container end wall 10 with a
non-removable pull tab 12 affixed thereto and a lockdown hook 14
for restraining the tab in a non-obstructing position on the
container wall after opening is illustrated in FIGS. 1 and 2.
Container wall 10 is preferably made of aluminum or an alloy
thereof and has a peripheral seam 16 therearound which may be
joined to a container body by conventional methods. A peripheral
groove 18 may also be provided adjacent to and inwardly of seam 16
to strengthen end wall 10 against reversal or outward doming.
To provide a pouring orifice in a container wall 10, a V-shaped
score line 20 may be formed in the container wall to define a flap
22 which can be depressed into a can on which the container wall is
affixed. Opening flap 22 is preferably located near the periphery
of container wall 10 with the apex of score 20 toward the edge of
the wall and with the ends of the score diverging approximately
60.degree. from such apex. An anti-fracture score, not shown, may
also be provided in opening flap 22 adjacent and parallel to score
20 to relieve the stresses in the residual metal in the score and
thereby substantially eliminate any stress cracks from forming in
the score.
Container wall 10 may further include a U-shaped score 24 defining
a tear strip 26 which has a starting end in a central portion of
the container wall and a terminal unscored end toward flap 22. Tab
12 is affixed to tear strip 26 and to opening flap 22 by means of
rivet attachments 28 and 30 respectively. Scores and tabs exemplary
of those which can be used are more fully illustrated and described
in application Ser. No. 212,561, filed concurrently herewith on
Dec. 27, 1971. As described in that application, tab 12 may include
a handle end 32 and a nose end 34 and may have a weakening line 36
in its upper wall between its nose and handle ends to facilitate
depressing the handle end to a non-obstructing position on the
container wall after opening. End wall 10 may also have a finger
well 37 formed therein for facilitating initial lifting of a tab
from the end wall as is well known in the art.
To form a pouring orifice in a container wall 10, tab 12 is first
lifted to rupture score line 24 around tear strip 26 and initiate
rupture of score 20 around flap 22. Continued lifting of tab 12
plunges opening flap 22 downwardly into a container on which
container wall 10 is affixed. Handle end 32 of tab 12 is preferably
pushed against seam 16 on end wall 10 at the end of the lifting
step to insure that flap 22 is fully opened and to facilitate
lockdown of the handle end after opening as will be explained
later. During such lifting, tab 12 remains substantially rigid
since weakening line 36 is in the upper wall of the tab and does
not effect the strength of the tab. After tab 12 has been
manipulated to form a pouring orifice 42 in wall 10, the last step
is to depress handle end 32 of the tab downwardly into a
non-obstructing position against the upper surface of container
wall 10. Weakening line 36 in the upper surface of tab 12 permits
bending of the tab between its handle end 32 and nose end 34 in
this direction so that when the handle end is depressed against the
container wall, the nose end remains in the container. This leaves
a substantially open pouring orifice through which the contents of
the container can be emptied. Such a pouring orifice 42 is
illustrated in FIG. 3.
It is a feature of the invention that means is provided for
retaining handle end 32 of tab 12 in a depressed non-obstructing
position on container wall 10 after opening has been effected. The
container end illustrated in U.S. Pat. No. 3,618,815 included no
such retaining means, and the handle end of the tab in that
structure could become raised above the surface of the container
wall and could interfere with drinking or pouring from the
container. When such a raised handle portion of a tab interferes
with drinking from the container, the consumer may break the tab at
the weakening line between its nose end and handle end and discard
the handle end of the tab to cause a litter problem. The purpose of
a non-removable tab could therefore be defeated by a tab which has
a handle portion which can spring back to an obstructing position
on a container wall. This invention substantially eliminates any
problems with such a raised handle end of a tab after opening.
In its preferred form, means for locking down handle end 32 of tab
12 after opening is provided in the form of an upwardly embossed
hook 14 formed in end wall 10 within the large finger aperture in
the tab so that the hook is engageable over an edge portion of the
tab around the finger aperture. Lock-down hook 14 is preferably
engageable with the edge of tab 12 around the aperture in handle
end 32 thereof offset from the longitudinal axis of the tab. In the
embodiment selected for illustration, hook 14 is located on a
radial line extending from approximately the center of the finger
aperture at approximately a 45.degree. angle to the longitudinal
axis of tab 12 toward the outer end of the tab. This location may
be on either side of the longitudinal axis of tab 12, although in
the container end 10 selected for illustration it is located
between 10 and 11 o'clock on the periphery of the finger aperture
when the tab oriented as illustrated with its nose down or toward
the bottom of FIG. 3. As will be explained, location of a lock-down
hook 14 offset from the longitudinal axis of tab 12 facilitates
engagement of the hook with the edge of the tab even if there are
small variations in the dimensions of an end, and also avoids
possible interference of the lock-down with a tab 12 which could
make it difficult to affix the tab on end wall 10.
Referring to FIGS. 2 and 4, it is seen that the edge of tab 12
around the finger aperture in its handle end 32 is curled in the
form of a bead 38. It is also seen that lock-down hook 14 has an
outwardly projecting rounded nose 40 on or near its top. As
illustrated in FIG. 2, nose 40 and curled bead 38 are preferably
not to be in contact prior to opening of a pouring orifice in
container end 10 and do not contact during opening. If nose 40
engages bead 38 during opening, hook 14 could interfere with
lifting of handle end 32 of tab 12 which could make opening
difficult.
After a pouring orifice is formed in container end 10 and handle
end 32 of the tab 12 is depressed to a non-obstructing position as
illustrated in FIGS. 3 and 4. When handle end 32 of tab 12 is so
depressed, the handle end will be disposed a short distance further
toward the pouring orifice than it was before opening. This means
that nose 40 on lock-down hook 14 will engage curled bead 38 on tab
12 when the handle end is depressed against the container end to
hold the handle end against the container end as illustrated in
these Figures. Handle end 32 of tab 12 has been moved axially
toward pouring orifice 42 because the handle end is attached to
nose end 34 which is plunged into a container. As nose end 34 of a
tab 12 is plunged into a container, the tab is rotated about a
fulcrum located approximately in the plane of the container end,
and this pulls the tab forward on the end. When handle end 32 is
then depressed to a non-obstructing position on the end, its
attachment to nose end 34 of the tab, which remains in the can,
holds the handle end of the tab in a slightly forward position with
respect to its original position on the ends. Accordingly, curled
edge 38 around the finger aperture in tab 12 will now contact nose
40 on lock-down hook 14. Since both nose 40 and bead 38 are
rounded, depression of handle end 32 against the lock-down will
cause the rounded edge of the bead to slide over the rounded edge
of the nose and catch under the nose as illustrated in FIG. 4.
Pushing handle end 32 of tab 12 against seam 16 during opening, as
described above, helps to insure that lockdown hook 14 will hold
the handle end of the tab against container wall 10 after opening.
This pushes flap 22 further into a container and pulls tab 12
further forward on container wall 10 to provide positive engagement
between the hook and curled bead 38 when the tab is depressed
against the container wall. Such positive engagement prevents
spring back in tab 12 from lifting its handle end 32 off end wall
10 and interfering with emptying of a container.
As discussed above, the location of lock-down hook 14 so as to
engage edge 38 slightly offset from the longitudinal axis of tab 12
toward the outer end of the tab also facilitates locking engagement
of the hook on the tab. If there is substantial interference
between nose 40 and curled bead 38 when handle end 32 is depressed
against container end 10, the handle end of the tab can twist
slightly in its plane so that its longitudinal axis is rotated
toward lock-down hook 14. This moves the finger aperture in tab 12
so that it extends further outwardly with respect to hook 14 to
reduce the interference between head 38 and nose 40 and permit the
bead to slide over the nose and engage thereunder. If lock-down
hook 14 were located on the longitudinal axis of tab 24, the hook
would engage the edge of the finger aperture at its farthest
extent, and rotation of the tab would not facilitate the sliding of
bead 38 over nose 40. Instead, in instances of substantial
interference between the hook and the curled edge around the finger
aperture, it might be necessary to pull the tab rearward so that
the bead could slide over the lock down. Location of lock-down hook
14 offset from the longitudinal axis of tab 12 also facilitates
location of finger well 37 under the end of the tab.
From the above, it is also seen that it is preferable to locate
hook 14 so that it is engageable with curled bead 38 on the
one-half of the periphery of the finger aperture toward the outer
end of the tab. Since tab 12 is moved toward the pouring orifice by
the opening mechanics, hook 14 would either interfere with
affixation of the tab to end 10 or would not engage the edge of the
finger aperture upon opening if the hook were located adjacent bead
38 toward the nose end of the tab.
Turning to FIGS. 5 through 14, a method and tools for forming a
lock-down hook of the invention are illustrated. FIG. 5 illustrates
a punch 44 with a hemispherical working end 46 which is advanced
against a container end 10 and against a die 48 with an aperture 50
therein and an annular shoulder 52 around the aperture. Shoulder 52
preferably has a radius of curvature approximately corresponding to
that of the hemispherical end 46 of punch 44 and may have small
radii 54 and 56 between the shoulder and the upper surface of the
die and the inner surface of the aperture 50 in the die. Advancing
punch 44 against die 48 draws metal from container end 10 into
aperture 50 and extrudes metal from between hemispherical end 46 on
the punch and shoulder 52 to form a bubble 58 in the container end.
Extrusion of metal from between punch 44 and die 48 may also form a
small protrusion 59 on the end bubble 58 as illustrated in this
Fig. Although other tools and methods can be employed for a forming
bubble to be reformed into a lockdown hook, the tools and method
illustrated in FIG. 5 are preferred since they facilitate the
formation of a relatively high bubble which facilitates the forming
of such a hook.
FIGS. 6 through 10 illustrate tools and a method for reforming
bubble 58 into a boss 60. These tools include a punch 62 with an
upwardly extending projection 64 thereon over which a bubble 58 in
the end wall 10 is positioned and reformed by means of a die 66
with a nose 68 thereon for co-acting with the projection on the
punch. Projection 64 and nose 68 may have parallel curved surfaces
69 and 70 thereon for reforming bubble 58 therebetween. As
illustrated in FIG. 10, advancing punch 62 against die 66 reforms
bubble 58 over projection 64 on the punch to form a boss 60 having
a shape substantially corresponding to the shape of projection
64.
FIGS. 11 through 14 illustrate tools and a method of reforming boss
60 into a lock-down hook 14. These tools include a punch 72 with an
upwardly projecting button 74 thereon over which boss 60 is
reformed by means of a die 76 with a substantially flat forming
surface 78 thereon. Forming surface 78 and the upper surface 80 of
button 74 are substantially parallel and are inclined at an angle
of approximately 15.degree. to horizontal. Button 74 on punch 72
has a substantially oval-horizontal configuration so that boss 60
will fit thereover, and has an inwardly and upwardly sloping outer
surface 82 around approximately two-thirds of its upper surface 80
(FIGS. 12 and 13). Boss 60 on end wall 10 is higher than is button
74 on punch 72 so that excess metal is provided to be buckled
outwardly to form nose 40 on lockdown hook 14 as illustrated in
FIG. 14. Nose 40 provides a hook for engaging an edge of a tab for
locking the handle end of the tab in a non-obstructing position on
a container end as discussed above.
It is therefore seen that an improved easy opening device is
provided which has a non-severable tab thereon and which includes a
lock-down hook formed in the container wall for engaging an edge of
the tab to hold it in a nonobstructing position on the container
end. Although a preferred embodiment and method of making the same
are illustrated and described, it will be apparent to those skilled
in the art that numerous variations can be made in the details of
the preferred embodiment and mode of making the same without
departing from the scope of the appended claims.
* * * * *