U.S. patent application number 10/844825 was filed with the patent office on 2005-09-08 for closure with linerless seal.
This patent application is currently assigned to Drug Plastics & Glass Company, Inc.. Invention is credited to Sprishen, Gregory.
Application Number | 20050194343 10/844825 |
Document ID | / |
Family ID | 34915714 |
Filed Date | 2005-09-08 |
United States Patent
Application |
20050194343 |
Kind Code |
A1 |
Sprishen, Gregory |
September 8, 2005 |
Closure with linerless seal
Abstract
A closure sealingly engages with a container having a generally
annular neck having a top edge and inner and outer surfaces and
defining a container opening. The closure comprises a generally
circular top wall having opposed inner and outer surfaces. A
generally annular skirt extends downwardly from the inner surface
of the top wall. A plurality of annular seal members, extending
downwardly from and integral with the inner surface of the top
wall, includes at least a plug seal that engages with the inner
surface of the neck to create a first seal therebetween, a V-ring
seal that engages with the top edge of the neck to create a second
seal therebetween, and a flexible seal that engages with the top
edge of the neck to create a third seal therebetween.
Inventors: |
Sprishen, Gregory; (Newtown
Square, PA) |
Correspondence
Address: |
AKIN GUMP STRAUSS HAUER & FELD L.L.P.
ONE COMMERCE SQUARE
2005 MARKET STREET, SUITE 2200
PHILADELPHIA
PA
19103
US
|
Assignee: |
Drug Plastics & Glass Company,
Inc.
|
Family ID: |
34915714 |
Appl. No.: |
10/844825 |
Filed: |
May 13, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60551125 |
Mar 8, 2004 |
|
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|
Current U.S.
Class: |
215/344 ;
215/354 |
Current CPC
Class: |
B65D 41/0421
20130101 |
Class at
Publication: |
215/344 ;
215/354 |
International
Class: |
B65D 041/04; B65D
053/00 |
Claims
We claim:
1. A closure for a container having a generally annular neck
defining a container opening, the neck having a top edge and inner
and outer surfaces, the closure comprising: a generally circular
top wall having opposed inner and outer surfaces; a generally
annular skirt extending downwardly from the inner surface of the
top wall, the generally annular skirt having opposed outer and
inner surfaces; and a plurality of annular seal members extending
downwardly from and integral with the inner surface of the top
wall, the plurality of seal members having at least a plug seal
that engages with the inner surface of the neck to create a first
seal therebetween, a V-ring seal that engages with the top edge of
the neck to create a second seal therebetween, and a flexible seal
that engages with the top edge of the neck to create a third seal
therebetween.
2. The closure of claim 1 wherein the plug seal is generally rigid
and has an indentation proximate the top wall that engages with a
lip on the inner surface of the neck proximate the top edge to form
an interference fit between the lip and the indentation.
3. The closure of claim 1 wherein the plug seal is generally rigid
and has an outside surface that engages with the inner surface of
the neck to form an interference fit between at least a portion of
the outside surface of the plug seal and at least a portion of the
inner surface of the neck.
4. The closure of claim 1 wherein the V-ring seal is generally
rigid and engages with the top edge of the neck to form an
interference fit.
5. The closure of claim 1 wherein the flexible seal deflects to
become compressed between the top edge of the neck and the inner
surface of the top wall.
6. The closure of claim 1 wherein the inner surface of the skirt
and the outer surface of the neck have mating threads, whereby the
closure is threadingly engaged with the neck of the container to
engage the plurality of seal members with the neck of the
container, thereby sealing the opening of the container.
7. A combination container and closure system comprising: a
container having a generally annular neck defining a container
opening, the neck having a top edge and inner and outer surfaces;
and a closure having a generally circular top wall having opposed
inner and outer surfaces, a generally annular skirt extending
downwardly from the inner surface of the top wall, the generally
annular skirt having opposed outer and inner surfaces, and a
plurality of annular seal members extending downwardly from and
integral with the inner surface of the top wall, wherein the
plurality of annular seal members includes at least a plug seal
that engages with the inner surface of the neck to create a first
seal therebetween, a V-ring seal that engages with the top edge of
the neck to create a second seal therebetween, and a flexible seal
that engages with the top edge of the neck to create a third seal
therebetween.
8. The combination of claim 7 wherein the plug seal is generally
rigid and has an indentation proximate the top wall that engages
with a lip on the inner surface of the neck proximate the top edge
to form an interference fit between the lip and the
indentation.
9. The closure of claim 7 wherein the plug seal is generally rigid
and has an outside surface that engages with the inner surface of
the neck to form an interference fit between at least a portion of
the outside surface of the plug seal and at least a portion of the
inner surface of the neck.
10. The combination of claim 7 wherein the V-ring seal is generally
rigid and engages with the top edge of the neck to form an
interference fit.
11. The combination of claim 7 wherein the flexible seal deflects
to become compressed between the top edge of the neck and the inner
surface of the top wall.
12. The combination of claim 7 wherein the inner surface of the
skirt and the outer surface of the neck have mating threads,
whereby the closure is threadingly engaged with the neck of the
container to engage the plurality of seal members with the neck of
the container, thereby sealing the opening of the container.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional
Patent Application No. 60/551,125, filed Mar. 8, 2004, with the
same title.
BACKGROUND OF THE INVENTION
[0002] This invention generally relates to closures for containers
and, more particularly, to caps that seal containers without the
use of a separate liner or O-ring seal.
[0003] Caps having separate liners or O-ring seals are generally
known. The liners and O-rings in these types of caps are generally
located on an inner side of a top wall of the cap. These caps
generally operate by compressing the liners or O-ring seals between
a top edge of a neck of the container and the top wall of the
cap.
[0004] Caps having flexible or rigid flanges that extend from an
inner top wall of the cap to seal a mouth of a bottle when the
flexible seal is brought into contact with the surface of the
bottle adjacent the neck are generally known. Specifically, caps
having rigid plug seals, rigid V-ring seals, or flexible flap seals
are known. However, none incorporate all three types of seals in a
single cap.
[0005] The present invention seeks to improve upon the prior art by
eliminating the additional cost and manufacturing time required to
produce caps with separate liners or O-rings. Additionally, the
present invention seeks to improve upon the prior art by providing
a closure having multiple types of seals to decrease the
possibility of leaking.
BRIEF SUMMARY OF THE INVENTION
[0006] Briefly stated, the present invention is a closure for a
container having a generally annular neck defining a container
opening. The neck has a top edge and inner and outer surfaces. The
closure comprises a generally circular top wall having opposed
inner and outer surfaces. A generally annular skirt extends
downwardly from the inner surface of the top wall. The generally
annular skirt has opposed outer and inner surfaces. A plurality of
annular seal members extends downwardly from and is integral with
the inner surface of the top wall. The plurality of seal members
has at least a plug seal that engages with the inner surface of the
neck to create a first seal therebetween, a V-ring seal that
engages with the top edge of the neck to create a second seal
therebetween, and a flexible seal that engages with the top edge of
the neck to create a third seal therebetween.
[0007] In another aspect, the present invention is a combination
container and closure system comprising a container having a
generally annular neck defining a container opening. The neck has a
top edge and inner and outer surfaces. A closure has a generally
circular top wall having opposed inner and outer surfaces. A
generally annular skirt extends downwardly from the inner surface
of the top wall. The generally annular skirt has opposed outer and
inner surfaces. A plurality of annular seal members extends
downwardly from and is integral with the inner surface of the top
wall. The plurality of annular seal members includes at least a
plug seal that engages with the inner surface of the neck to create
a first seal therebetween, a V-ring seal that engages with the top
edge of the neck to create a second seal therebetween, and flexible
seal that engages with the top edge of the neck to create a third
seal therebetween.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0008] The foregoing summary, as well as the following detailed
description of the preferred embodiment of the invention, will be
better understood when read in conjunction with the appended
drawings. For the purpose of illustrating the invention, there is
shown in the drawings an embodiment which is presently preferred.
It should be understood, however, that the invention is not limited
to the precise arrangements and instrumentalities shown.
[0009] In the drawings:
[0010] FIG. 1 is a cross-sectional view of a closure having a
linerless seal in accordance with the present invention;
[0011] FIG. 2 is a greatly enlarged fragmentary view of the closure
of FIG. 1;
[0012] FIG. 3 is a cross-sectional view of the closure of FIG. 1
secured to a container; and
[0013] FIG. 4 is a greatly enlarged fragmentary view of the closure
and container of FIG. 3.
DETAILED DESCRIPTION OF THE INVENTION
[0014] Certain terminology is used in the following description for
convenience only and is not limiting. The words "right," "left,"
"upper," and "lower" designate directions in the drawings to which
reference is made. The terminology includes the words above
specifically mentioned, derivatives thereof, and words of similar
import.
[0015] Referring to the drawings in detail, wherein like numerals
indicate like elements throughout, there is shown in FIGS. 1-4 a
preferred embodiment of a closure, indicated generally at 10,
having a linerless seal in accordance with the present invention.
Referring to FIGS. 1-2, the closure 10 has a generally flat and
generally circular top wall 12 having opposed inner and outer
surfaces, a generally annular skirt or sidewall 13 extending
downwardly from the inner surface of the top wall 12 and having
opposed inner and outer surfaces, and an open bottom side. Closure
threads 14 are disposed on the inner surface of the sidewall
13.
[0016] Referring now to FIGS. 2 and 4, extending downwardly from
and integral with the inner surface of the top wall 12 are a
plurality of annular seal members, including at least a cylindrical
plug seal 16, a V-ring seal 18, and a flexible seal 20. The plug
seal 16 is generally rigid and has a generally finger-shaped
cross-section. The plug seal 16 has a small indentation 16a
proximate its junction with the top wall 12. The V-ring seal 18 is
generally rigid and has a generally V-shaped cross section. The
V-ring seal 18 is located slightly radially outwardly from the plug
seal 16. The flexible seal 20 is located slightly radially
outwardly from the V-ring seal 18 and has a generally finger-shaped
cross-section. The plug seal 16, the V-ring seal 18, and the
flexible seal 20 are all generally circular when viewed from below
and generally centered about a center of the top wall 12.
[0017] Referring now to FIGS. 3-4, the closure 10 is intended to be
sealingly engaged with a container 40. The container 40 has a
generally annular neck 42 having container threads 44 along an
outer surface of the neck. The neck 42 defines a generally circular
opening therein. The neck 42 has a top edge 42a and a small lip
42b, protruding inwardly from an inner surface and located
proximate the top edge 42a of the neck 42.
[0018] Interaction of the closure threads 14 with the container
threads 44 allow the closure 10 to be threadingly engaged onto the
neck 42 of the container 40. The closure 10 acts to seal the neck
42 of the container 40 in order to inhibit contents (not shown) of
the container 40 from leaking out of or otherwise escaping from the
container 40.
[0019] Preferably, the closure 10 is made of polypropylene and the
container 40 is made of high density polyethylene, and both are
formed through an injection or blow molding process. Although this
is preferred, it is within the spirit and scope of the present
invention that the closure 10 and the container 40 be made of
different types of polymeric material (or even materials other than
polymeric material) using a process other than injection or blow
molding, such as vacuum molding, for instance.
[0020] In operation, the closure 10 is threadably secured to the
container 40. As the closure 10 is rotated into a seated position,
the lip 42b of the neck 42 of the container 40 slides along an
outside surface 16b of the plug seal 16. As the closure 10 moves
further into the seated position, a tip of the flexible seal 20
interacts with the top edge 42a of the neck 42 and begins
deflecting upwardly and outwardly. When the closure 10 reaches the
seated position, the lip 42b of the neck 42 snaps into the
indentation 16a of the plug seal 16 to create an interference fit
between the lip 42b and the indentation 16a. Additionally, the
outside surface 16b of the plug seal 16 preferably engages with the
inner surface of the neck 42 to form an interference fit between at
least a portion of the outside surface 16b of the plug seal 16 and
at least a portion of the inner surface of the neck 42. The
flexible seal 20 is deflected further outward and upward so as to
become compressed within a gap between the top edge 42a and the top
wall 12, thereby effectively closing the gap. Lastly, the V-ring
seal 18 engages with the tope edge 42a, slightly biting into the
top edge 42a to form an interference fit between the V-ring seal 18
and the top edge 42a of the neck 42.
[0021] In this way, the closure 10 effectively forms three seals
with the neck 42 of the container 40: (1) the interference fit
between the plug seal 16 and inner surface of the neck 42, (2) the
interference fit between the V-ring seal 18 and the top edge 42a of
the neck 42, and (3) the compression of the flexible seal 20
between the top edge 42a of the neck 42 and the top wall 12. By
sealing the neck 42 of the container 40 at three separate
locations, as above-described, the contents of the container 40 are
effectively inhibited from escaping from the container 40 without
the need for a separate liner or O-ring seal.
[0022] Although the closure 10 shown is of a simple screw-on
configuration, it is understood by those skilled in the art that
the present invention can be used with any type of cap. For
instance, the present invention could be used with a double-shell,
child-resistant cap which requires a user to push downwardly on the
top surface of the outer shell of the cap while rotating it in a
loosening direction in order to remove the cap from the bottle. A
more detailed explanation of the structures and operation of the
double-shell, child-resistant cap are set forth in U.S. Pat. No.
6,206,216 B1, entitled "Child-Resistant Cap", which is hereby
incorporated by reference herein.
[0023] The closure 10 of the present invention overcomes two major
drawbacks of the prior art. Firstly, there is no need for a
separate liner or separate O-ring seal when using the closure 10 of
the present invention. Therefore, the additional expense and time
of performing the extra step of attaching such a liner or seal is
avoided. Secondly, the closure 10 incorporates three different
seals, namely the plug seal 16, the V-ring seal 18, and the
flexible seal 20, to inhibit leakage of the contents from the
bottle 40. Having three seals allows for a double-redundant system
in which there are two back-up seals to inhibit leakage should one
of the three seals allow leakage.
[0024] It will be appreciated by those skilled in the art that
changes could be made to the embodiment described above without
departing from the broad inventive concept thereof. It is
understood, therefore, that this invention is not limited to the
particular embodiment disclosed, but it is intended to cover
modifications within the spirit and scope of the present
invention.
* * * * *