U.S. patent number 3,613,940 [Application Number 05/024,280] was granted by the patent office on 1971-10-19 for slice feeding lid.
This patent grant is currently assigned to Sweetheart Plastics, Inc.. Invention is credited to Paul Davis.
United States Patent |
3,613,940 |
Davis |
October 19, 1971 |
SLICE FEEDING LID
Abstract
A slice feeding lid designed for use in automatic handling
equipment and having a closure wall with a central portion offset
from the plane of the periphery of the central portion and joined
thereto by a camming surface which cooperates with an identical
adjacent lid in a stack to cause the stacked lids to displace
axially when the bottom lid is sliced from the stack.
Inventors: |
Davis; Paul (Swampscott,
MA) |
Assignee: |
Sweetheart Plastics, Inc.
(Wilmington, MA)
|
Family
ID: |
21819781 |
Appl.
No.: |
05/024,280 |
Filed: |
March 31, 1970 |
Current U.S.
Class: |
220/781; 229/400;
220/380 |
Current CPC
Class: |
B65D
43/021 (20130101); B65D 2543/00796 (20130101); B65D
2543/00296 (20130101); B65D 2543/00027 (20130101); B65D
2543/00509 (20130101); B65D 2543/00351 (20130101); B65D
2543/00555 (20130101); B65D 2543/0062 (20130101); B65D
2543/00092 (20130101); B65D 2543/00537 (20130101); B65D
2543/00685 (20130101); B65D 2543/00731 (20130101) |
Current International
Class: |
B65D
43/02 (20060101); B65d 043/10 (); B65d
021/00 () |
Field of
Search: |
;220/60,97 ;229/1.5B,43
;150/.5 ;215/41 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Hall; George T.
Claims
Having described this invention in detail, what I claim is:
1. A disposable one-piece coverall, plastic lid comprising
a closure wall and an upstanding sidewall joined to the periphery
of the closure wall,
a flange extending outwardly from and joined to the sidewall,
and a downwardly extending skirt joined to the periphery of the
flange,
said sidewall, flange and skirt defining a U-shaped pocket to
receive the rim of a container with which said lid may be used,
an axially displaced central portion provided in the closure wall
and extending at least in one direction axially beyond the axial
limits of the skirt and sidewall,
and a camming surface joining the central portion of the closure
wall with its surrounding portion which would be engaged by an
identical lid stacked below to move the lid axially when said
identical lid is sliced from the stack.
2. A disposable one-piece coverall, plastic lid as described in
claim 1 further characterized by
said central portion lying below the bottom of the skirt and
sidewall,
said camming surface extending upwardly and outwardly from the
central portion of the surrounding portion.
3. A disposable one-piece coverall, plastic lid as described in
claim 1 further characterized by
said central portion lying above the top of the skirt and
sidewall,
said camming surface extending from the central portion downwardly
and outwardly to the surrounding portion.
4. In combination with the lid of claim 1,
a container having side and bottom walls, and a rolled rim,
and a lid seat in the sidewall disposed below the rim for receiving
the periphery of the closure wall and the bottom of the lid
sidewall,
said central portion of the sidewall lying outside the plane of the
lid seat.
5. In the combination of claim 4,
said central portion lying below the plane of said lid seat,
and said central portion having a greater diameter than the bottom
wall of the container.
6. A disposable one-piece coverall, plastic lid as described in
claim 1 further characterized by
said skirt and sidewall being of the same axial height causing
their bottoms to rest on the tops of the skirt and sidewall of the
next lower lid when two such lids are nested together.
7. In the combination of claim 4,
said central portion lying above the plane of the rim.
8. In the combination of claim 4,
said rolled rim lying below and spaced from the flange of the
lid.
9. In the combination of claim 5,
said rolled rim lying below and spaced from the flange of the
lid.
10. A disposable one-piece coverall, plastic lid as described in
claim 1 further characterized by
an upwardly and outwardly inclined wall joining the top of the
sidewall to the inner edge of the flange.
Description
This invention relates to plastic lids, and more particularly
comprises a new and improved disposable one-piece coverall plastic
lid such as those used with food containers filled on automatic
filling machines.
At the present time it is common practice to use coverall lids made
of plastic in combination with food containers filled on automatic
filling equipment. The machines presently available to fill the
containers and subsequently cap them include automatic lid-handling
mechanisms which slice feed the lids in stack form one at a time to
a capping station. In such mechanisms the lids are stacked in
nested relationship, and stacking facilities are designed into the
lids in an effort to avoid compacting of the lids, which makes them
difficult to separate. Nevertheless, because the lids are often
made of relatively thin plastic material, they are quite flexible
and distort readily, and they frequently compact together during
shipment or in the magazine of the lid-handling mechanism. When
lids are in a compacted state while in the magazine, the feeding
mechanism cannot separate the lids properly, and the mechanism jams
and special attention is required of the operator. In certain prior
art devices, special mechanisms such as revolving stack posts and
motor-driven discs are built into the dispensers to create
agitation in the stack. These mechanisms are expensive and are not
altogether satisfactory.
One object of this invention is to provide a coverall lid capable
of being handled in automatic lid-feeding mechanisms and which
itself serves to agitate the lids in the magazine as each lid is
fed so as to separate compacted lids and prevent additional
compacting.
Another object of this invention is to provide a coverall lid which
is suitable for use with so-called rim-stacking containers so as to
establish a standard fill depth for the container when the bottom
of the stacking facility is substantially above the normal fill
height.
Another object of this invention is to provide means for enabling a
single container to be used for different fill volumes.
FIG. 1 is a cross-sectional elevation view showing a lid and
container constructed in accordance with this invention;
FIG. 2 is a cross-sectional view similar to FIG. 1 showing another
container and lid constructed in accordance with this
invention;
FIG. 3 is a fragmentary cross-sectional elevation showing a lid
magazine and shuttle feed mechanism containing a stack of lids
shown in FIG. 1;
FIG. 4 is a cross-sectional view similar to FIG. 3 and showing the
manner in which the lowermost lid in the magazine is sliced from
the stack and the effect of that action on other lids in the
magazine;
FIG. 5 is a cross-sectional view similar to FIG. 4 and showing the
mechanism filled with lids of the FIG. 2 embodiment;
FIG. 6 is a fragmentary cross-sectional view of two lids in nested
relationship that comprise another embodiment of this
invention;
FIG. 7 is a view of the lids shown in FIG. 6 compacted in jammed
relation; and
FIG. 8 is a cross-sectional elevation view showing yet another
embodiment of lid and container constructed in accordance with this
invention.
In FIG. 1 a container 10 and lid 12 are shown with the lid seated
on the container rim in sealed relationship. The container which
may be of any configuration is shown in the drawing to include a
bottom wall 14 and a sidewall 16 integrally joined at the lower
corner 18. The upper portion 18 of the sidewall 16 of the container
is provided with a lid seat 20 in the form of a shoulder which
extends outwardly from the plane of sidewall 16. The upper margin
of the sidewall 16 is provided with a rolled rim 22, and the
container is designed to nest with other identical containers with
the lower surface of shoulder 20 supported on the crown of the rim
22 of the next lower container, to prevent the containers from
compacting, in accordance with well known techniques in the
container art.
The lid 12 includes a closure wall 24 having a central portion 26
and a surrounding peripheral portion 28 joined by camming surface
20. Preferably the diameter of the central portion 26 of the lid
exceeds the diameter of the bottom wall 14 of the container to form
a seat when filled containers are stacked one on the other. The lid
also contains a sidewall 32 joined to the peripheral portion 28 by
bead 34 which is designed to cooperate with the lid seat 20 and/or
inclined intermediate wall 35 of the upper portion 18 of the
container to form a seal between the container and lid. As will be
explained more fully below, the bead 34 also enhances nesting of
identical lids of the type shown in a magazine, shipping carton,
etc.
An outwardly extending flange 36 is connected to the top of
sidewall 32 of the lid at corner 38, and a skirt 40 is joined to
the outer edge 42 of the flange 36 and extends downwardly to the
plane of the peripheral portion 28 of the closure wall 24. To seat
the lid as shown in FIG. 1, the bead 34 is snapped by the inner
edge 44 of the rim 22, and because the inner diameter of the rim 22
is less than the outer diameter of the bead 34, once in place it
remains in place unless substantial force is applied to remove
it.
It is to be understood that to effect a seal about the container
mouth the peripheral portion 28 of the closure wall 24 of the lid
need not be seated on the shoulder 20. The height of the sidewall
32 of the lid may be substantially shorter axially than the axial
distance between the crown of the rim 22 and the shoulder 20, in
which case the bead will not sit on the shoulder. The bead 34
normally should bear against the inclined wall 35 between the
shoulder 20 and the rim 22, to effect the seal, which may or may
not be supplemented by contact between shoulder 20 and peripheral
portion 28.
When the lid is on the container, it will be noted that the central
portion 26 extends substantially below the shoulder 20 so as to
give the lid a depth d which is greater than the shoulder depth s.
There are several desirable features which flow from this
particular configuration. The food packaging industry has
established a more or less standard lid depth which makes a most
attractive package. That is, the cylindrical wall of the lid
established by the rim-covering structure provides an esthetically
pleasing appearance by giving the container the impression of
strength and mass. However, with containers designed as rim
stackers with lid seats very close to the top, less than the
desired depth is provided if the closure wall of the lid is
confined substantially to the plane of the lid seat shoulder 20.
And it is desirable to reduce the axial extent between the rim
crown and the lid seat 20 so as to reduce the stack height of a
given number of containers when nested together, which obviously
reduces shipping costs. Thus, the invention serves opposing
interests by allowing the axial height between the rim and the lid
seat 20 to be reduced while preserving the desired depth of the lid
between the central portion 26 and the flange 36.
Another important advantage of this invention is illustrated in
FIGS. 3 and 4. In those figures a magazine 50 is suggested composed
of a number of spaced posts 52 secured together at their lower ends
by plate 54 which in turn may be connected to the filling machine
frame or other support. A typical magazine of the type shown is
used on automatic filling equipment such as shown in copending
application Ser. No. 607,251, filed Jan. 4, 1967 entitled LIQUID
FILLING MACHINE. In that equipment containers are automatically
filled, lids are fed automatically to the containers, and the lids
are snapped in place. In the mechanism of FIG. 3 a shuttle 56 is
movable back and forth below the magazine 50 on platform 58 to feed
to the lids to a capping station (not shown). The lids 12 are
stacked in the magazine 50 in the manner shown with the bottom of
the sidewall 32 and the skirt 40 seated on the top of the sidewall
and skirt of the next lower lid in the stack. In this arrangement a
relatively stable stack is provided which tends to preserve the
orderly arrangement of the lids in the magazine when stacked one
upon the other as suggested. The bead 34 rests on flange 36 of the
next lower lid to resist lid jamming.
With the shuttle 56 in the position illustrated, its recess 60
receives the lowermost lid in the magazine 50 so that the
peripheral wall portion 28 rests on the surface 62 of support 58. A
slot 64 may be provided in the support 58 to receive the camming
surface 30 and the central portion 26 of the lowermost lid. To
separate the lowermost lid from the stack, the shuttle 56 moves to
the right, and this technique is ordinarily called slice feeding.
When the lid is slice fed in this manner, it will be apparent that
the corner 38 of the lowermost lid as viewed on the left in FIG. 3
will engage the camming surface 30' of the next upper lid 12' in
the stack, and as the lowermost lid continues to move to the right
it will elevate the stack of lids above it. This is clearly shown
in FIG. 4. Thus, as each lid is sliced from the bottom of the stack
during each actuation of the shuttle 56, the lowermost lid agitates
the stack by pushing the lids upwardly in the magazine. This
agitation serves to maintain the several lids in the stack in an
uncompacted condition. That is, the lids have a tendency to jam
together particularly when they are formed of thin sheet plastic
material, and the agitation of the stack serves to unstick any of
the lids which have become fully or partially jammed. The agitation
will also serve to disturb the stack sufficiently to prevent the
flange 36 of one lid from entering between the skirt and sidewall
of the next upper lid. The stack is agitated during each cycle of
the shuttle 56.
The camming surface 30 in each lid serves an additional function by
providing axial stiffness in the closure wall 24 while enhancing
radial flexibility. Thus it allows the bead 34 to snap more easily
by the inner edge 44 of the rim.
The lid shown in FIG. 2 in one sense is the reverse of the lid of
FIG. 1 in that its closure wall 70 has a central portion 72 that is
displaced upwardly above the cylindrical wall 74 composed of the
flange 76, sidewall 78, and skirt 80. The flange, sidewall and
skirt of the lid of FIG. 2 may be identical to the corresponding
parts of the lid of FIG. 1, as is the bead 82 which joins the
sidewall 78 to the closure wall 70.
The container 10 illustrated in FIG. 2 is identical to that of FIG.
1, and it will be appreciated that with the lid of FIG. 2 the
container volume is significantly increased. The extent of the
increase is of course dependent upon the axial displacement of the
central portion of the lid. It will be appreciated that significant
savings may be realized by reducing inventory requirements if one
size of container may be used for different volumes and only
different lid configurations are used. Thus by providing a line of
lids having central portions of different depth between the
extremes of FIGS. 1 and 2, the same container could be used over a
range of several ounces to pack ice cream or other foods.
In FIG. 5 the manner in which the lids of FIG. 2 may be slice fed
from a magazine is suggested. When the lowermost lid is displaced
to the right, the camming surface 86 of the lowermost lid on the
right is shown to engage the camming surface 86' of the next upper
lid so as to elevate that lid and as a result agitate all those
lids above it in the magazine. Thus with each ejection of a lid
from the magazine, the entire column of lids in the magazine is
agitated to loosen them and prevent jamming. It will be appreciated
if the closure wall 24 or 70 of either of the lids shown is
confined to the axial space between the flange 36 or 76 and the
bottoms of the skirt 40 or 80 and sidewall 32 or 78, no agitation
will be imparted to the lids above the lowermost lid in the stack
when the lowermost lid is slice fed by the shuttle but rather the
column of lids will only fall in the magazine as each lid is sliced
from the bottom.
In FIGS. 6 and 7 a slight modification of the invention is shown,
and in connection with this embodiment the tendency of the lids to
compact is illustrated. In FIG. 6, the lids 100 are provided with a
beveled surface 102 which joins the sidewall 104 with the outwardly
extending flange 106 at the cylindrical peripheral wall 108 that
surrounds the closure wall 110. The beveled surface 102 serves as a
support for the bead 112 at the bottom of the sidewall 104. It is
evident in FIG. 6 that when the bead 112 of the upper lid rests on
the beveled surface 102' of the next lower lid, and simultaneously
the foot 114 of the skirt 116 engages the radius 118' of the next
lower lid, the stack of lids has considerable lateral stability
when nested in proper relationship with the lid axes coincident
with one another. The beveled surface which adds to stack stability
has the disadvantage of somewhat increasing the opportunity of the
lids to compact. In FIG. 7 it will be noted that the bead 112 at
the bottom of the sidewall 104 has moved down to engage the top of
the sidewall 104' of the next lower lid, while the foot 114 at the
bottom of skirt 116 has slipped down to engage the skirt 116' of
the lower lid. Because the lids are often made of a very thin and
flexible sheet material, the peripheral cylindrical structure of
the lid can distort so as to bind on the lid below in the manner
illustrated in FIG. 7. The inclined surface 102 may serve as a
wedge to spread the gap between the skirt and sidewall to open it
sufficiently to receive the peripheral structure of the next
adjacent lid.
In connection with the embodiment of FIG. 1 mention was made of the
advantage achieved by the lid of preserving the desired lid depth
even when the stack height of the rim-stacking type of container is
very small. This desirable feature may be served also by the
embodiment of this invention shown in FIG. 8. In that figure the
container 10 is identical to the container of FIGS. 1 and 2, but
the manner in which the lid cooperates with the rim of the
container to seal the container mouth is somewhat modified. Thus,
the lid 120 includes a peripheral cylindrical structure 122 which
surrounds the closure wall 124 in turn composed of the central
portion 126, camming wall 128 and peripheral portion 130. In this
form, the bead 132 which joins the peripheral portion 130 to the
sidewall 134 engages the very bottom of the lid seat as defined by
the shoulder 136 in the container, and the sidewall 134 extends
upwardly an appreciable distance above the crown 138 of the
container rim 140. The flange 142 thus spans the rim 140 spaced
above the rim, and the skirt 144 of the lid extends downwardly from
above the rim, to enclose it. By this arrangement, a standard or
desired depth lid may be achieved. To gain the total desired lid
depth, a part of that depth is made up by the extent of the
sidewall 134 of the lid and the remainder by the depression in the
closure wall 124. Significantly, the closure wall still contains
the camming surface 128 to cause agitation of the lid as it is
slice fed from the magazine. It will be appreciated that the lid
may contain the inclined surface 102 as shown in the embodiment of
FIG. 6, but that surface is not necessary.
While in the embodiments shown the skirt and sidewall of each lid
are shown to be axially coextensive, it is to be understood that
the lids need not have that configuration, and either the outer
skirt or the sidewall alone may be used for nesting purposes.
However, if the two are to cooperate as shown in FIG. 3 to support
the lids in nested relation in the stack, then the axial height of
the sidewall and skirt should be identical, but they need not be
coextensive.
* * * * *