U.S. patent number 3,802,590 [Application Number 05/255,398] was granted by the patent office on 1974-04-09 for linerless container closure.
This patent grant is currently assigned to Bernardin, Inc.. Invention is credited to Robert M. Culver.
United States Patent |
3,802,590 |
Culver |
April 9, 1974 |
LINERLESS CONTAINER CLOSURE
Abstract
A linerless container closure includes a closure body having a
base and an integral skirt extending from the base, retaining means
on the skirt engageable with retaining means on a container for
releasably securing the closure on the container in sealing
relationship, an annular internal sealing surface on the base
adjacent the skirt, an integral pressure ring projecting from the
base adjacent the radially inner periphery of the sealing surface
therearound, and an integral annular sealing flange projecting
divergently from the base around the radially inner periphery of
the pressure ring and extending radially outwardly across and
beyond the pressure ring, the sealing flange being engageable by
the sealing rim and the adjacent inside edge of a container neck to
clamp the flange between the sealing rim and the base sealing
surface and between the inside edge and the pressure ring to
thereby form a seal between the container and the closure.
Inventors: |
Culver; Robert M. (Evansville,
IN) |
Assignee: |
Bernardin, Inc. (Evansville,
IN)
|
Family
ID: |
22968149 |
Appl.
No.: |
05/255,398 |
Filed: |
May 22, 1972 |
Current U.S.
Class: |
215/344;
215/DIG.1 |
Current CPC
Class: |
B65D
41/0428 (20130101); Y10S 215/01 (20130101) |
Current International
Class: |
B65D
41/04 (20060101); B65d 041/04 () |
Field of
Search: |
;215/DIG.1,40,43 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
1,107,541 |
|
May 1961 |
|
DT |
|
1,213,812 |
|
Nov 1959 |
|
FR |
|
274,657 |
|
Sep 1969 |
|
OE |
|
Primary Examiner: Norton; Donald F.
Claims
Having thus described the invention what I claim as new and desire
to secure by letters patent is:
1. A linerless container closure which comprises:
a closure body having a base and an integral skirt extending from
the base,
retaining means on said skirt engageable with retaining means on a
container for releasably securing the closure on the container in
sealing relationship,
an annular internal sealing surface on said base adjacent said
skirt,
an integral pressure ring projecting from said base adjacent the
radially inner periphery of said sealing surface therearound,
and
an integral annular sealing flange projecting divergently from said
base around the radially inner periphery of said pressure ring and
extending radially outwardly across and beyond the pressure ring,
the free end of said sealing flange being adapted to extend over
said base sealing surface for sealing purposes,
said sealing flange being engageable by the sealing rim and the
adjacent inside edge of a container neck to move the flange into
intimate contact with the radially outer surface of said pressure
ring and also with said base sealing surface, whereby upon
tightening the closure on a container, said flange is sealingly
clamped both between the sealing rim and the base sealing surface
with the application of sealing force in parallel to the container
axis, and between the inside edge and the outer surface of the
pressure ring with the application of sealing force angularly with
respect to the container axis.
2. A closure as defined in claim 1 wherein said pressure ring is a
relatively rigid element having an inclined radially outer surface,
and said sealing flange is a relatively flexible element capable of
cold flow.
3. A closure as defined in claim 1 and constructed of molded
plastic.
4. An integrally molded linerless plastic container closure which
comprises:
a closure body having a base and an integral skirt extending from
the base,
retaining means on said skirt engageable with retaining means on a
container for releasably securing the closure on the container in
sealing relationship,
an annular internal flat sealing surface on said base adjacent said
skirt,
a relatively rigid integral pressure ring having a substantially
V-shaped cross section projecting from said base adjacent the
radially inner periphery of said sealing surface therearound,
and
a relatively flexible integral annular sealing flange capable of
cold flow projecting divergently from said base around the radially
inner periphery of said pressure ring and spaced therefrom, and
extending radially outwardly across and beyond the pressure ring,
the free end of said sealing flange being adapted to extend over
said base sealing surface for sealing purposes,
said sealing flange being engageable by the sealing rim and the
adjacent inside edge of a container neck to move the flange into
intimate contact with the radially outer surface of said pressure
ring and also with said base sealing surface, whereby upon
tightening the closure on a container, said flange is sealingly
clamped both between the sealing rim and the base sealing surface
with the application of sealing force in parallel to the container
axis, and between the inside edge and the outer surface of the
pressure ring with the application of sealing force angularly with
respect to the container axis, and said flange is stretched over
the inside edge.
5. A closure as defined in claim 4 and constructed of molded
polyolefin.
6. A closure as defined in claim 5 wherein said polyolefin is
polypropylene.
7. A closure as defined in claim 4 and wherein said skirt retaining
means comprise screw thread means.
8. A container and closure therefor comprising, in combination,
a container having a neck provided with external retaining means
and terminating in a sealing rim and an adjacent inside edge;
and
a linerless container closure which comprises:
a closure body having a base and an integral skirt extending from
the base, said skirt receiving said container neck therein,
retaining means on said skirt engageable with said retaining means
on said container neck for releasably securing the closure on the
container in sealing relationship,
an annular internal sealing surface on said base adjacent said
skirt,
an integral pressure ring projecting from said base adjacent the
radially inner periphery of said sealing surface therearound, the
ridge of said pressure ring having a diameter less than the outer
diameter of said inside edge of said container neck, and
an integral annular sealing flange projecting divergently from said
base around the radially inner periphery of said pressure ring and
extending radially outwardly across and beyond the pressure ring,
the free end of said sealing flange being adapted to extend over
said base sealing surface for sealing purposes;
said sealing flange being engageable by said sealing rim and said
inside edge of said container neck to move the flange into intimate
contact with the radially outer surface of said pressure ring and
also with said base sealing surface, whereby upon tightening the
closure on said container, said flange is sealingly clamped both
between the sealing rim and the base sealing surface with the
application of sealing force in parallel to the container axis, and
between the inside edge and the outer surface of the pressure ring
with the application of sealing force angularly with respect to the
container axis, and said flange is stretched over the inside
edge.
9. A combination as defined in claim 8 and wherein said closure is
constructed of molded plastic, said pressure ring is a relatively
rigid element having a substantially V-shaped cross section, and
said sealing flange is a relatively flexible element capable of
cold flow and is spaced from the inner periphery of said pressure
ring.
10. A combination as defined in claim 9 and wherein said respective
retaining means comprise screw thread means.
11. A combination as defined in claim 10 and wherein said inside
edge on said container neck is a radiused edge.
12. A combination as defined in claim 10 and wherein said inside
edge on said container neck is a chamfered edge.
13. A combination as defined in claim 10 and wherein said plastic
is polypropylene.
Description
BACKGROUND OF THE INVENTION
The invention relates to container closures, more particularly, to
linerless closures, that is, closures requiring no liner or gasket
to effect a seal with a container.
Linerless container closures that will effect a tight seal with a
container are in demand, for markedly reducing the closure cost,
and for sanitary, assembly and other reasons. Heretofore, a number
of such closures have been proposed but have been lacking in one or
more respects. The principal problem has been the provision of a
closure that will reliably seal a container, especially such
containers as commonly suffer from surface irregularities. Sealing
problems have been greatest with glass bottles used to package
alcoholic or oily liquids.
A linerless container closure previously employed with a particular
glass container design is illustrated in Miller et al. U.S. Pat.
No. 3,255,909. This combination of closure and container requies
that the container be specially manufactured for use with the
closure, with the container neck held to close tolerances, all
rendering the container relatively expensive. Other prior linerless
closures were unsuccessful in sealing glass containers and/or were
expensive to manufacture, with the result that, apparently, none of
them are used to a significant extent with glass containers, and
especially, for packaging alcoholic or oily liquids.
It would be desirable to provide a linerless container closure that
would reliably seal containers having common irregularities,
especially standard articles of commerce including glass bottles.
More particularly, it would be desirable for achieving and
maintaining reliable sealing to provide a closure that affords an
increased area of firm sealing engagement between the closure and a
container, and, further, produces a tighter, more lasting seal.
Also, it would be desirable to provide such a closure that could be
manufactured readily and economically, and, further, could take
advantage of the potential manufacturing ease and economy afforded
by plastic materials of construction.
SUMMARY OF THE INVENTION
The invention provides a linerless container closure including a
closure body having a base and an integral skirt extending from the
base, retaining means on the skirt engageable with retaining means
on a container for releasably securing the closure on the container
in sealing relationship, an annular internal sealing surface on the
base adjacent the skirt, an integral pressure ring projecting from
the base adjacent the radially inner periphery of the sealing
surface therearound, and an integral annular sealing flange
projecting divergently from the base around the radially inner
periphery of the pressure ring and extending radially outwardly
across and beyond the pressure ring, the sealing flange being
engageable by the sealing rim and the adjacent inside edge of a
container neck to clamp the flange between the sealing rim and the
base sealing surface and between the inside edge and the pressure
ring to thereby form a seal between the container and the closure.
The closure advantageously is constructed of molded plastic,
preferably a polyolefin. The invention also provides a new and
improved combination of a container and the closure.
The container closure of the invention performs outstandingly in
providing a reliable seal on a container. Leakproof sealing is
achieved on glass bottles filled with alcoholic or oily liquids.
For example, the new closure reliably seals glass bottles that are
manufactured commercially with GCMI (Glass Container Manufacturers
Institute) tolerances, and which commonly have irregularities on
the rim or on the adjacent inside edge or so-called inside top
radius of the bottle neck. Sealing is effected both on the rim and
on the inside edge, which may be a radiused edge or a chamfered
edge, as conventionally provided. It is a feature of the preferred
embodiments of the invention that, owing to the construction of the
closure, an integral sealing flange thereof is stretched over the
inside edge of the container neck, to completely fill and tightly
seal irregularities on the surface of the neck.
The construction of the new container closure is also advantageous
in that the pressures exerted in use act to prevent the closure
from backing off of the container, which may occur with other
closures, especially upon moving or handling. Also, there is no
loss of the seal upon normal relaxation of the closure construction
material. The closure continues to be effective when used for
resealing a container subsequent to its initial application and
removal.
The new closure is useful both for pressurized and unpressurized
containers, constructed of various materials, including glass,
plastic and metal. The closure may be manufactured readily and
economically of molded plastic, preferably polyolefin, and the
physical properties of the plastic, including appropriate rigidity,
flexibility, resilience, cold flow and deformability are utilized
to advantage.
DESCRIPTION OF THE DRAWINGS
The attached drawings illustrate preferred embodiments of the
invention, without limitation thereto. In the drawings, like
elements are identified by like reference symbols in each of the
views, and:
FIG. 1 is an exploded or disassembled longitudinal sectional view
of a linerless container closure according to the invention and the
outer portion of the neck of a container with which the closure may
be employed, taken along the common longitudinal axis of the
articles;
FIG. 2 is an elevational and partly sectional view of the members
illustrated in FIG. 1, showing them in assembled relationship;
FIG. 3 is an enlarged fragmentary longitudinal sectional view of
the members illustrated in the preceding views, showing the closure
as it is being threaded onto the container neck and prior to
reaching sealing interengagement of the members;
FIG. 4 is a view similar to FIG. 3, but illustrating the closure
tightly threaded on the container neck, as finally assembled in
sealing interengagement; and
FIG. 5 is a view similar to FIGS. 3 and 4, but illustrating another
form of container neck to which the closure may be applied, and
illustrating in full lines the container neck as it appears when
the closure is being applied prior to reaching sealing engagement,
and in broken lines the container neck as it appears when the
closure is finally applied in sealing engagement.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIGS. 1-4 of the drawings, a linerless container
closure or cap 10 is illustrated in combination with the neck 12 of
a glass bottle or container, in accordance with a preferred
embodiment of the invention. In FIG. 5, the closure 10 is
illustrated in combination with a bottle neck 12' constituting a
modification or variation of the bottle neck 12 illustrated in the
preceding views.
The illustrative bottle necks 12 and 12' embody conventional
finishes, such as are provided on commercial 4/5 quart liquor
bottles. In each case, the finish includes an annular external
transfer ring 14, an external screw thread 16 thereabove, and a top
sealing finish 18 or 18'. The top sealing finish 18 of the bottle
neck of FIGS. 1-4 includes a generally flat normally horizontal
sealing rim 20 and an adjacent radiused inside or inner edge 22,
also referred to at times as the inside top radius. The sealing rim
constitutes the outer or upper end surface of the bottle neck 12.
The inside edge 22 extends from the rim 20 to the inner wall 24 of
the bottle neck 12, and defines the mouth of the bottle neck. The
top sealing finish 18' of the bottle neck 12' illustrated in FIG. 5
similarly includes a generally flat sealing rim 26 and a chamfered
inside or inner edge 28 extending from the rim 26 to the inside
wall 24 of the bottle neck and defining the mouth thereof.
The neck 12 or 12' of a glass bottle as manufactured for commercial
use within acceptable tolerances frequently suffers from
irregularities on its rim 20 or 26 and on its inside edge 22 or 28.
In order to produce a liquid-tight seal, it is necessary for the
closure to accommodate the irregularities, and especially, to
tightly and completely fill in any depressions. A tight seal should
be produced both upon initial application of the closure to the
container and upon resealing after opening the container. The seal
should not be broken upon standing or handling, as a result of
relaxation of the sealing members or backing off of the
closure.
The closure 10 is constructed to cooperate with bottles having the
conventional necks 12 and 12', without need for any special
construction or finishing of the bottle neck. The closure itself is
readily and economically manufactured by molding. In general, the
closure 10 is constructed to fit a bottle neck or other container
neck of predetermined size and dimensions, but the closure
structure accommodates a certain amount of variation in neck
dimensions.
In the preferred embodiments of the invention, the closure 10 is
molded as a unit of plastic material suitable for performing the
intended functions. As will appear from the description which
follows, the material should be sufficiently rigid to form a
closure body and produce the necessary pressure, yet sufficiently
flexible in an appropriate thickness to form a pliable sealing
element. The material should provide for cold flow or deformation
of the sealing element, to accommodate irregularities in the
container neck. The material while somewhat resilient preferably
also has a relatively poor elastic memory, so as to minimize any
tendency for the sealing element to cause the closure to back off
of the container neck. The closure 10 may be constructed of a
polyolefin, as conventionally used for the manufacture of prior
container closures. The preferred material of construction is a
polymer of propylene and/or ethylene, including polypropylene,
polyethylene, and copolymers of propylene and ethylene.
Polypropylene is employed in the preferred illustrative
embodiment.
The closure 10 includes a body 30 having a circular base or panel
32 and a cylindrical tubular skirt 34 extending around the outer
periphery of the base 32 and normal thereto. An inner wall 36 of
the skirt 34 is provided with an integral molded screw thread 38.
The base 32, the skirt 34, and the thread 36 in general may be of
conventional construction, so that the body 30 is relatively rigid
and the structure is capable of forming a tight, strong and durable
closure. The screw thread 38 mates with the screw thread 16 on the
bottle neck 12 or 12'. The screw threads 16 and 38 serve as
interengageable retaining means for releasably securing the closure
10 on the bottle neck in sealing relationship.
The base 32 of the closure 10 includes a substantially flat inner
wall 40. A relatively rigid integral circular pressure ring 42
having a relatively shallow substantially V-shaped cross section
projects from the inner wall 40 of the base, in spaced relation to
the inner wall 36 of the closure skirt 34. As clearly seen in FIGS.
3 and 4, the pressure ring 42 includes inclined radially outer and
inner surfaces 44 and 46 extending at respective angles A and B of
45.degree. to the longitudinal axis of the closure 10, thus
enclosing an angle of 90.degree. between them, in the illustrative
preferred embodiment. The respective surfaces 44 and 46 of the
pressure ring are joined to the inner wall 40 of the closure base
32 by fillets 48 and 50. The pressure ring surfaces 44 and 46 are
of equal width, and the altitude of the triangle formed by the
surfaces with the inner wall surface 40 is parallel to the
longitudinal axis of the closure 10, which in use normally is
vertical. The pressure ring surfaces 44 and 46 intersect or adjoin
around a circular ridge, peak or apex 52.
An annular internal flat sealing surface 54 remains on the inner
wall 40 of the closure base 32, and it extends from the inner wall
36 of the skirt 34 to the fillet 48 adjoining the outer surface 44
of the pressure ring 42. The pressure ring 42 bounds the base
sealing surface 54, projecting from the base 32 adjacent the
radially inner periphery of the sealing surface 54 therearound.
An integral frusto conical, annular sealing flange or fin 56
capable of cold flow or deformation projects divergently from the
inner wall 40 of the base 32 around the radially inner periphery of
the pressure ring 42 and spaced inwardly from the inner surface 46
thereof. The sealing flange 56 is a relatively thin and flexible
element having respective inclined radially outer and inner
surfaces 58 and 60, which converge slightly in a direction away
from the base 32 and thereby form a slightly tapered element. The
flange outer and inner surfaces 58 and 60 extend at respective
angles C and D of 40.degree. and 46.degree. with respect to the
longitudinal axis of the closure 10. The respective surfaces 58 and
60 are joined to the inner wall 40 of the base 32 by fillets 62 and
64. The flange 56 extends from the base 32 radially outwardly
across and beyond the pressure ring 42, with the free end 66 of the
flange adapted to extend over or reach the base sealing surface 54
for sealing purposes, as illustrated in FIG. 4.
The sealing flange 56 is adapted to flex around the pressure ring
42 and intimately follow the outer surface 44 of the pressure ring,
the adjacent fillet 48, and the base sealing surface 54, to form a
seal therewith, as seen in FIG. 4. An annular air pocket 68 then
may remain between the base of the sealing flange 56 and the inner
surface 46 of the pressure ring 42. At times, the sealing flange 56
is pulled so tightly against the pressure ring 42 that the pocket
68 is eliminated or substantially so.
Referring to FIG. 3, the sealing flange 56 projects obliquely into
the path of relative movement of the bottle neck 12 as the closure
10 is threaded onto the neck. The sealing flange 56 is contacted by
the neck 12, more specifically, by the rim 20 thereon. As the
closure 10 is threaded onto the neck 12, the flange 56 is moved or
displaced by the neck upwardly into interengagement of the several
elements as illustrated in FIG. 4. The sealing rim 20 and the
adjacent inside edge 22 of the container neck 12 clamp the sealing
flange 56 between the sealing rim 20 and the base sealing surface
54, and between the inside edge 22 and the outer surface 44 of the
pressure ring 42, to thereby form a seal between the neck 12 of the
container and the closure 10. The seal extends over the rim 20 and
over the adjacent inside edge 22, to seal the neck in the two
significant areas. The rigidity of the pressure ring 42 and of the
closure base 32 cause the sealing flange 56 to cold flow or deform
into any surface irregularities on the sealing rim 20 or inside
edge 22 of the bottle neck. With both the rim 20 and inside edge 22
areas sealingly engaged, the possibility of a leak due to an
imperfection in either is effectively foreclosed.
It is an important feature of the preferred embodiments of the
invention that the structure of the closure 10 functions
additionally to stretch the sealing flange 56 over the inside edge
22 of the bottle neck 12, or over a portion thereof, so that the
sealing flange conforms very tightly to the surface of any
irregularity in the edge of the bottle neck, to form an
exceptionally tight, reliable seal. The stretching of the sealing
flange takes place when the portion of the sealing flange adjacent
its free end 66 is clamped between the bottle neck rim 20 and the
base sealing surface 54, and the pressure ring 42 moves inwardly
with respect to the inside edge 22 on the bottle neck, whereby the
intermediate portions of the sealing flange 56, clamped between the
pressure ring 42 and the inside edge 22, are stretched or pulled
inwardly and downwardly. This result is obtained upon applying
sufficient torque to the closure 10, for example, about 25-30 lbs.
for the illustrative embodiment. The seal is maintained despite
relaxation of the stressed closure material.
The closure 10 cooperates with the bottle neck 12' of FIG. 5 in
essentially the same manner. Thus, as the bottle neck 12' is
received within the closure 10, the sealing rim 26 contacts the
free end 66 of the sealing flange 56, and with further relative
movement, the elements become interengaged in the manner
illustrated in broken lines. At this time, the sealing flange 56 is
clamped between the sealing rim 26 and the base sealing surface 54,
and between the chamfered inside edge 28 and the pressure ring 42,
to thereby form a seal between the container neck and the closure.
The sealing flange 56 is stretched over the inside edge 28 by the
action of the pressure ring 42 in cooperation with the remaining
structure, in like manner to the described cooperation with the
preceding embodiment of the bottle neck 12.
The structure of the closure 10 avoids any wrinkling or folding of
the sealing flange 56. Rather, the flange 56 extending outwardly
into engagement with the bottle neck 12 or 12' is stretched over
the rim 20 or 26 and the inside edge 22 or 28 thereof. Sealing
forces are exerted both in parallel to the longitudinal axis of the
bottle neck, between the sealing rim 20 or 26 and the base sealing
surface 54, and angularly or obliquely with respect to such axis,
between the inside edge 22 or 28 and the outer surface 44 of the
pressure ring 42. The forces exerted by the pressure ring 42
angularly in the direction of the inside edge 22 or 28 tend to
prevent the closure 10 from backing off, particularly as compared
to the axial or vertical forces exerted if, for example, only a
resilient sealing or gasket member were inserted between the
sealing rim 20 or 26 of a bottle neck and the base sealing surface
54 of the closure.
The closure 10 is constructed in appropriate size and with an
appropriate screw thread 38 to receive the bottle neck 12 or 12' or
other container neck therein. While it is preferred to provide on
the container neck and on the closure mating screw threads 16 and
38, as illustrated, it will be apparent that other interengageable
retaining means may be provided on the respective members for
securing them together.
The diameter of the ridge 52 of the pressure ring 42 is determined
for the container neck to be used with the closure. Thus, the
diameter of the ridge 52 is less than the outer diameter of the
inside edge 22 or 28, or less than the inner diameter of the rim 20
or 26, of the bottle neck 12 or 12'. The sealing flange 56 is
spaced inwardly from the pressure ring 42, in the manner
illustrated, with permissible variation in spacing. Some variation
in the inside diameter of the inner wall 24 of the bottle neck 12
is acceptable, so long as the ridge 52 of the pressure ring 42 is
within the outside diameter of the inside edge 22. With greater
variation, the diameter of the ridge 52 may be increased or
decreased with or without a change in the diameter of the sealing
flange 56, as may be necessitated by a change in the diameter of
the ridge 52 or for molding facility or other reason. It is
relatively simple and economical to change a mold to vary the
location of the pressure ring 42, and this represents an advantage
of the invention. The closure 10 similarly is constructed for
cooperation with the bottle neck 12'. In certain cases, as with the
respective illustrative embodiments, the closure 10 may be used
alternatively with conventional bottles of either type.
Illustrative typical dimensions for a bottle neck 12 or 12' include
a diameter for the inner wall 24 of 0.760 inch and a diameter for
the outer wall 70, adjacent to the rim 20 or 26, of 0.978 inch. The
inside edge 22 of the container neck 12 has a radius R of about
0.031 inch and an outer diameter of about 0.822 inch. The inside
edge 28 of the container neck 12' extends at an angle of about
45.degree. to the longitudinal axis of the bottle neck 12' and has
an outer diameter of 0.830 inch.
Referring to FIGS. 3 and 4, the thickness E of the base 32 in the
illustrative embodiment is 0.060 inch, and the altitude F of the
pressure ring 42 is 0.025 inch. The diameter of the ridge 52 of the
pressure ring is 0.815 inch. The diameter of the inner wall 36 of
the closure skirt 34, exclusive of the screw thread 38, is 0.982
.+-. 0.012 inch.
The horizontal distance G from the outer fillet 62 adjacent the
sealing flange 56, to the ridge 52 of the pressure ring is 0.055
inch in the illustrative embodiment. The horizontal distance H from
the fillet 62 to the free end 66 of the sealing flange 56 is 0.120
inch. The vertical distance J from the free end 66 of the sealing
flange 56 to the inner wall 40 of the base 32 is 0.110 inch. The
sealing flange 56 is 0.010 inch thick at its free end 66, and 0.012
inch at its juncture with the base inner wall 40, measured in the
direction parallel to the wall 40 and exclusive of the fillets 62
and 64.
The invention thus provides a linerless closure that reliably seals
a container in liquid-tight engagement therewith. The closure seals
standard containers manufactured with normal tolerances and having
the common irregularities in the finish. Glass containers are
effectively sealed, with no necessity for special molding,
finishing or other techniques to provide a reliable sealing
surface. The seal is maintained even with the more difficult
alcohol and oil-containing liquids. The new closure provides for
sealing engagement both with the sealing rim of a container neck
and with the inside edge thereof, whether it be radiused or
chamfered. The preferred embodiments of the closure further
cooperate with the container neck to stretch a sealing flange over
and tightly against the surface of the inside edge of the bottle
neck, in intimate leak-proof engagement therewith.
The new closure is readily and economically molded in one piece of
plastic material. A single closure may be employed with a number of
containers of variable neck dimensions, and the sealing elements of
the closure may be manufactured to cooperate with container necks
having greater variations in dimension. The closure will continue
to function effectively as the container mold wears normally, with
resulting changes in the contour of the container neck,
particularly the inside edge thereof.
While preferred embodiments of the invention have been described
and illustrated, it will be apparent to those skilled in the art
that various changes and modifications may be made therein within
the spirit and scope of the invention. It is intended that such
changes and modifications be included within the scope of the
appended claims.
* * * * *