Note: Descriptions are shown in the official language in which they were submitted.
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
CLOSURE DEVICE FOR A RECLOSABLE POUCH
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] The present application is a continuation-in-part of U.S. Patent
Application Serial
No. 10/861,674 filed on June 4, 2004.
REFERENCE REGARDING FEDERALLY SPONSORED RESEARCH OR
DEVELOPMENT
[0002] Not applicable
SEQUENTIAL LISTING
[0003] Not applicable
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
[0004] The present invention relates to closures for reclosable pouches, and
more
particularly, to such closures that include two closure mechanisms comprised
of male and
female closure elements.
DESCRIPTION OF THE BACKGROUND OF THE INVENTION
[0005] A thermoplastic pouch for the storage of items typically includes a
closure
mechanism comprising multiple profiles disposed on opposed inner surfaces of
pouch walls.
In a specific example, two sets of profiles are disposed on pouch walls
wherein each set
includes a male and a female closure element.
[0006] Ausnit U.S. Patent No. 3,656,147 discloses a plastic bag having male
and female
resealable interlocking elements integrally attached thereto for selectively
opening and
closing an end of the bag. The bag further includes a pair of stiffener ribs
formed integrally
with the bag and disposed below the resealable elements to provide increased
rigidity along
an open end of the bag to prevent inadvertent separation of the elements.
[0007] Ausnit U.S. Patent No. 4,787,880 discloses a bag having first and
second zipper
strip bases secured to opposing wall panels of the bag. The bases each include
at least two
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-2-
arrow-shaped profiles extending therefrom to engage with the profiles of the
opposing base,
wherein the profiles of the same base are adjacent one another.
[0008] Ausnit U.S. Patent No. 4,792,240 discloses a bag having a reclosable
zipper
including first and second base members each having a plurality of
interlocking zipper profile
parts extending therefrom. The bottom-most profile part has a head having a
greater mass
than the head of the other profile parts to resist opening of the zipper due
to internal
pressures.
[0009] Johnson U.S. Patent No. 6,138,329 discloses a reclosable bag having an
assembly
that includes first and second male arrow-shaped profiles extending
perpendicularly from a
first base. The assembly further includes first and second female U-shaped
members
extending perpendicularly from a second base to engage the first and second
male profiles,
respectively. Each of the male arrow-shaped profiles includes two prongs
extending
therefrom that engage with a female profile. The prongs of the second male
profile are
longer than the prongs of the first male profile to increase the opening force
of the second
male profile when interlocked with a respective female profile.
[0010] Malin U.S. Patent No. 6,167,597 discloses a zipper strip for a
reclosable package,
wherein the zipper strip includes a male and a female profile. There are at
least two male
interlocking members that extend from a base toward the opposite female
interlocking
members, wherein each male member has an asymmetrical arrow shape so that the
zipper is
easier to open from one side than the other. One or both of the profiles
includes at least one
high compression member that extends from a base thereof to touch a base of
the opposite
profile to allow the profiles to be sealed without crushing or distorting the
interlocking
members.
[0011] Linton U.S. Patent No. 6,691,383 discloses a webless zipper for a
reclosable bag
including interlocking male and female profiles. The male profile includes
three ribs,
wherein each of two of the ribs includes double-barbed end sections at the end
of a shaft.
The barbs of each end section are asymmetrical with a longer barb facing a
product side of
the bag to increase the opening force for the product side of the bag. The
female profile
includes two grooves, defined by legs that interlock with the double-barbed
end sections.
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-3-
SUMMARY OF THE INVENTION
According to one embodiment of the present invention, a reclosable pouch
comprises
a body portion having first and second pouch walls. A first closure mechanism
is disposed
on internal sides of the first and second pouch walls. The first closure
mechanism includes a
first female profile with first and second spaced legs. The first and second
spaced legs have
first and second female hook portions disposed on a distal end thereof,
respectively. The first
closure mechanism also includes a first male profile. A second closure
mechanism is
disposed on the internal sides of the first and second pouch walls. The second
closure
mechanism includes a second female profile with third and fourth spaced legs.
The third and
fourth spaced legs have third and fourth female hook portions disposed on a
distal end
thereof, respectively. The second closure mechanism also includes a second
male profile.
One of the first, second, third, or fourth female hook portions is thinner
than the other female
hook portion of the same female profile.
[0012] Other aspects and advantages of the present invention will become
apparent upon
consideration of the following detailed description and the attached drawings,
in which like
elements are assigned like reference numerals.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1 is an elevational view of a first embodiment of a reclosable
thermoplastic
storage bag according to the present invention;
[0014] FIG. 2 is an enlarged, fragmentary, sectional view taken generally
along the lines
2-2 of FIG. 1 depicting a first embodiment of a closure mechanism of the
present invention;
[0015] FIGS. 2A and 2B are enlarged fragmentary views of FIG. 2;
[0016] FIGS. 3-12 are views similar to FIG. 2 illustrating alternative closure
mechanisms
of the present invention; and
[0017] FIG. 13 is an enlarged fragmentary view of FIG. 12.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0018] Referring to FIGS. 1 and 2, a reclosable bag in the form of a
thermoplastic storage
pouch 20 comprises first and second body portions 22, 24 joined to one another
to form first
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-4-
and second pouch walls 26, 28. The first and second pouch walls 26, 28 are
joined at first
and second side portions 30, 32, respectively, and further are either integral
with one another
or are joined together at a bottom portion 34. An opening 35 is disposed at a
top portion 36
of the pouch 20. First and second closure mechanisms 38a, 38b and two lips 40
are also
disposed at the top portion 36 of the pouch 20. The first closure mechanism
38a is disposed
between the second closure mechanism 38b and an upper edge 42 of the top
portion 36.
[0019] Referring to FIG. 2, male and female closure elements or portions 44a,
44b,
respectively, of the first closure mechanism 38a are disposed on opposing
internal sides or
surfaces 46, 48, respectively, of the first and second pouch walls 22, 24,
respectively. In
addition, male and female closure elements or portions 50a, 50b of the second
closure
mechanism 38b are disposed on the internal sides or surfaces 48, 46,
respectively.
Preferably, although not necessarily, the first closure mechanism 38a is
parallel to the second
closure mechanism 38b and the two are spaced from one another by a distance
that is
sufficiently small to create the perception that mechanisms act as a single
closure. In
addition, the mechanisms 38a, 38b are preferably disposed sufficiently far
apart such that a
user's fingers and/or thumb are guided during the closing operation.
Typically, these results
are accomplished by spacing the mechanisms 38a, 38b between about 0.1 inch
(2.54 mm) and
0.3 inch (7.62 mm) apart, and, more preferably, between about 0.15 inch (3.81
mm) and
about 0.25 inch (6.35 mm) apart and most preferably about 0.20 inch (5.08 mm)
apart,
although a different spacing may instead be used.
[0020] Preferably, the closure elements or portions 44, 50 have a cross
sectional shape
and/or may be formed in accordance with the teachings of U.S. Patent
Application Serial No.
10/821,341, filed Apri19, 2004 (the application is entitled "Closure Device
for a Reclosable
Pouch," and was filed with an attorney docket No. 29252/3676A), owned by the
assignee of
the present application and the disclosure of which is hereby incorporated by
reference
herein. Also preferably, the first closure mechanism 38a exhibits a first
closure characteristic
and the second closure mechanism 38b exhibits a second closure characteristic
different than
the first closure characteristic. For example, either or both of the first and
second closure
mechanisms 38 may exhibit a relatively low level of resistance to pouch
opening forces but
provide a high level of deformation so as to exhibit a clicking feel and/or
sound when the
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-5-
pouch is opened or closed. In addition, either or both of the first and second
closure
mechanisms 38 may exhibit a low level of deformation but provide a relatively
high overall
resistance to pouch opening forces. Further, either or both of the male
closure elements 44a,
50a may be symmetric or asymmetric about a longitudinal centerline thereof and
either or
both of the female closure elements 44b, 50b may be symmetric or asymmetric
about a
longitudinal centerline thereof. Thus, for example, either or both of the
first and second
closure mechanisms 38 may have an asymmetric configuration so that the closure
mechanism
38 exhibits a first resistance to opening forces exerted on one side of the
mechanism 38 and
further exhibits a second, different resistance to opening forces exerted on
another side of the
mechanism 38.
[0021] The first female closure element 44b of FIG. 2 is substantially
symmetric about a
centerline 52. The first female closure element 44b comprises a C-shaped
profile and
includes a base 54b with a first spaced leg 56 and a second spaced leg 58
extending
therefrom. The first male closure element 44a is substantially asymmetric
about the
centerline 52. The first male closure element 44a includes a base 54a with a
body 60
extending therefrom. An engagement member 62 is disposed on an end of the body
60,
wherein the engageinent member 62 has a first hook portion 64 extending
therefrom. The
first female closure element 44b is adapted to receive the first male closure
element 44a when
pressure is exerted on the closure elements by a user's finger(s) during
closing of the pouch.
In one embodiment, the second female closure element 50b is substantially
symmetric about
a centerline 66. The second female closure element 50b also has a C-shaped
profile and
includes a base 68b with third and fourth spaced legs 70, 72, respectively,
extending
therefrom. The second female closure element 50b is also adapted to receive
the second male
closure element 50a when pressure is exerted on the closure elements by a
user's finger(s)
during closing of the pouch. The second male closure element 50a includes a
base 68a with a
body 74 extending therefrom. An engagement member 76 is disposed on an end of
the body
74, wherein the engagement member 76 has a second hook portion 78 extending
therefrom.
[0022] As may be seen in FIG. 2, the first male closure element 44a of the
first closure
mechanism 38a is adjacent the second female closure element 50b of the second
closure
mechanism 38b on the first pouch wall 26. The first male closure element 44a
is disposed
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-6-
closer to an upper edge 42 of the pouch on the first pouch wall 26 than the
second female
closure element 50b. Additionally, the first female closure element 44b of the
first closure
mechanism 38a is adjacent the second male closure element 50a of the second
closure
mechanism 38b on the second pouch wall 28. The first female closure element
44b is also
disposed closer to an upper edge 42 of the pouch on the second pouch wall 28
than the
second male closure element 50a. In other embodiments, the first female
closure element 44b
and the second male closure element 50a are disposed on the pouch wall 26 and
the first male
closure element 44a and the second female closure element 50b are disposed on
the pouch
wall 28. In still another embodiment, the first and second male closure
elements 44a, 50a are
disposed on either of the first or second pouch walls 26, 28 and the first and
second female
closure elements 44b, 50b are disposed on the opposing first or second pouch
walls 26, 28.
[0023] The first closure mechanism 38a is opened by disengaging the closure
elements
44a, 44b with a first opening force and the second closure mechanism 38b is
opened by
disengaging the closure elements 50a, 50b with a second opening force. In one
embodiment,
the first male closure element 44a disengages from the first female closure
element 44b with
a first external opening force and the second male closure element 50a
disengages from the
second female closure element 50b with a second external opening force. The
first and
second external forces are exerted from a side of the pouch nearer the upper
edge 42, as
opposed to internal bursting forces that act on the closure mechanisms 38a,
38b from within
the pouch. In another embodiment, the first male closure element 44a
disengages from the
first female closure element 44b with a first internal opening force and the
second male
closure element 50a disengages from the second female closure element 50b with
a second
internal opening force. The first and second internal opening forces are
exerted from a side
of the pouch nearer the content side of the pouch 20 and typically comprise
bursting forces.
Preferably, the first external and internal opening forces of the first
closure mechanism 38a
are different from each other and the second external and internal opening
forces of the
second closure mechanism 38b are different from each other.
[0024] The embodiment depicted in FIG. 2 includes the second hook portion 78
extending from the engagement member 76 toward the bottom portion 34 of the
pouch 20.
By not providing a similar hook portion on the opposite side of the engagement
member 76
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-7-
that is directed toward the opposing upper edge 42 of the pouch 20, differing
internal and
external opening forces can be established. The elimination of an extra hook
portion on the
opposing side (toward the upper edge 42) of the engagement member 76 allows
for the
second female closure element 50b to flex less around the second male closure
element 50a
during opening of the pouch 20. The result of the reduced flexing in the
second closure
mechanism 38b is a lower external opening force than exhibited by the first
closure
mechanism 38a. Conversely, the first male closure element 44a includes a first
hook portion
64 extending from the engagement member 62 toward the upper edge 42 of the
pouch 20.
The elimination of an extra hook portion on the opposing side (toward the
bottom portion 34)
of the engagement member 62 allows for the first female closure element 44b to
flex less
around the first male closure element 44a when the pouch 20 is opened from an
internal side
of the pouch 20. The result of the reduced flexing in the first closure
mechanism 38a is a
lower internal opening force than exhibited by the second closure mechanism
38b.
[0025] The provision of a single hook portion on either of the first or second
male closure
elements 44a, 50a also reduces the closing force necessary to engage the first
and second
closure mechan isms 38a, 38b. Similar to the opening of the closure mechanisms
38a, 38b
above, the first and second female closure elements 44b, 50b do not have to
stretch as far
around the first and second male closure elements 44a, 50a during closure,
because the male
closure elements 44a, 50a only include the first and second hook portions 64,
78,
respectively. This reduced stretching allows the first and second closure
mechanisms 38a,
38b to be closed with less force than would be required if the respective male
closure
elements 44a, 50a had extra hook portions.
[0026] The force required to open a closure mechanism utilizing an asymmetric
male
closure element may be adjusted by varying the thickness of the male closure
element. As
may be seen in FIG. 2A, the first male closure element 44a has a thickness A
at a portion of
the body 60 and a thickness B at the widest part of the hook portion 64. In
one embodiment,
the thicknesses A and B are substantially equal. Alternatively, the thickness
B can be
increased, thereby increasing the external opening force developed by the
closure mechanism
38a. In some embodiments that utilize multiple asymmetric male closure
elements, all of the
male closure elements have similar thicknesses and opening forces. In other
embodiments,
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-8-
each respective male closure element may have its own unique thickness and
opening force
requirements.
[0027] The force required to close a closure mechanism utilizing an asymmetric
male
closure element may also be adjusted by varying the thickness of the male
closure element.
As may be seen in FIG. 2B, the male closure element 44a includes a thickness C
that extends
from a tip of the first hook portion 64 to a back side of the first hook
portion 64. By
decreasing the thickness C relative to the rest of the male closure element
44a, the closing
force developed by the first closure mechanism 38a is decreased. Similarly,
increasing the
thickness C increases the closing force developed by the first closure
mechanism 38a. In
some embodiments that utilize multiple asymmetric male closure elements, all
of the male
closure elements have similar or identical thicknesses and closing forces. In
other
embodiments, each respective male closure element may have its own unique
thickness and
closing force requirements.
[0028] In other embodiments of the present invention, additional symmetric or
asymmetric closure mechanisms may be provided. While it is possible to combine
any
number of symmetric or asymmetric closure mechanisms within the pouch 20, it
is preferred
that only a third and a fourth additional closure mechanism 38c, 38d,
respectively, be
provided. In one embodiment depicted in FIG. 3, the first male closure element
44a is
asymmetric. The first hook portion 64 extends from the engagement member 62
toward the
upper edge 42 of the pouch 20. Disposed beneath the first closure mechanism
38a are
second, third, and fourth closure mechanisms 38b, 38c, 38d, respectively. The
second, third,
and fourth closure mechanisms 38b, 38c, 38d, include second, third, and fourth
male closure
elements 50a, 100a, 102a, respectively, that are also asymmetric. Second,
third and fourth
hook portions 78, 104, 106, respectively, extend from engagement members 76,
108, 110,
respectively, of the second, third, and fourth male closure elements 50a,
100a, 102a,
respectively. The engagement members 62, 76, 108, 110 are disposed on bodies
60, 74, 112,
114, respectively, that extend from bases 54a, 68a, 116a, 118a, respectively.
The second,
third, and fourth hook portions 78, 104, 106 extend toward the bottom portion
34 of the
pouch 20 in a direction opposite that of the first male closure element 44a.
Additionally, the
first, second, third, and fourth male closure elements 44a, 50a, 100a, 102a,
are in opposing
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-9-
and mating relationships with first, second, third, and fourth female closure
elements 44b,
50b, 100b, 102b, respectively. The first female closure element 44b includes
first and second
spaced legs 56, 58 extending from the base 54b, the second female closure
element includes
third and fourth spaced legs 70, 72 extending from the base 68b, the third
female closure
element includes fifth and sixth spaced legs 120, 122 extending from a base
116b, and the
fourth female closure element includes seventh and eight spaced legs 124, 126
extending
from a base 118b.
[0029] In another embodiment depicted in FIG. 4, a first closure mechanism
138a
includes a symmetric first male closure element 140a. The first male closure
element 140a
includes an engagement member 142 having two hook portions 144a, 144b. The
engagement
member 142 is disposed on an end of a body 145, wherein the body is further
connected to a
base 146a. A first female closure element 140b is also provided and includes a
base 146b
with a first spaced leg 148 and a second spaced leg 150 extending therefrom.
The first
female closure element 140b is adapted to receive the first male closure
element 140a when
pressure is exerted on the closure elements by a user's finger(s) during
closing of the pouch
20. Similar to the prior embodiment, second, third, and fourth closure
mechanisms 138b,
138c, 138d are provided with asymmetric second, third, and fourth male closure
elements
152a, 154a, 156a, respectively. The second, third, and fourth male closure
elements 152a,
154a, 156a are disposed beneath the first male closure element 140a and
comprise single
hook portions 78, 104, 106, respectively, that extend from engagement members
76, 108,
110, respectively. The second, third, and fourth male closure elements 152a,
154a, 156a also
include respective second, third, and fourth female closure elements 152b,
154b, 156b. The
second, third, and fourth female closure elements 152b, 154b, 156b include
pairs of spaced
legs similar to prior embodiments.
[0030] In yet another embodiment depicted in FIG. 5, a first closure mechanism
238a is
located adjacent the upper edge 42 of the pouch 20 and includes an asymmetric
first male
closure element 240a. The first male closure element 240a includes the
engagement member
62, wherein the first hook portion 64 extends from the engagement member 64
toward the
upper edge 42 of the pouch 20. A second closure mechanism 238b is disposed
below the first
closure mechanism 238a and closer to a bottom portion 34 of the pouch 20. The
second
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-10-
closure mechanism 238b includes an asymmetric second male closure element
242a, wherein
the second hook portion 78 extends from the engagement member 76 toward the
bottom
portion 34 of the pouch 20. A third closure mechanism 238c is disposed between
the first
closure mechanism 238a and the second closure mechanism 238b. The third
closure
mechanism 238c includes a second male closure element 244a, wherein the second
male
closure element 244a comprises an engagement member 246 having two hook
portions 248a,
248b. The first, second, and third male closure elements 240a, 242a, 244a
include opposing
first, second and third female closure elements 240b, 242b, 244b that are
similar to the
previous embodiments.
[0031] The provision of symmetric male closure elements provides for different
closer
characteristics than the asymmetric male closure elements. Specifically,
closure mechanisms
utilizing symmetric male closure elements can be formed to exhibit a high
degree of
deformation so as to develop a clicking feel when the pouch is opened or
closed. Preferably,
the closure mechanisms are produced in accordance with the teachings of Dais
et al., U. S.
Patent No. 5,140,727, owned by the assignee of the present application and the
disclosure of
which is hereby incorporated herein.
[0032] In some embodiments, a channel 300 may be provided for guiding the
user's
fingers during closure of the pouch 20. The channel 300 may be formed by
bending or
curving the pouch walls 26, 28 adjacent the closure mechanism near the top
portion of the
pouch 20. In a different embodiment, the size of at least one of the closure
mechanisms of
any of the embodiments described herein may be selected to be smaller than
adjacent closure
mechanisms. For example, FIG. 6, which is similar to the embodiment depicted
in FIG. 5,
shows the third closure mechanism 238c being smaller than the first and second
closure
mechanisms 238a, 238b. In so doing, the third closure mechanism 238c, which is
disposed
between the first and second closure mechanisms 238a, 238b, creates the
channel 300 for
guiding the user's fingers. It is also envisioned that the first and second
closure mechanisms
238a, 238b of the present embodiment could instead or in addition be made
larger. Further,
multiple closure mechanisms of any of the embodiments of the present invention
could be
made smaller or larger depending on the user's requirements.
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-11-
[0033] As should be evident, differing closure mechanisms may be constructed
to close
with differing closing forces. For example, the first male closure element
140a of FIG. 4
engages with the first female closure element 140b with a first closing force,
the second male
closure element 152a engages with the second female closure element 152b with
a second
closing force, the third male closure element 154a engages with the third
female closure
element 154b with a third closing force, and the fourth male closure element
156a engages
with the fourth female closure element 156b with a fourth closing force. In
one embodiment,
the first closing force is greater than the second, third, or fourth closing
forces. In another
embodiment, the second, third, and fourth closing forces are greater than the
first closing
force. Still further, other embodiments have first, second, third, and fourth
closing forces that
are approximately equal. Additionally, the second, third, and fourth closing
forces may also
be different from each other. The spacing, thickness, and type of material
used for the male
and female closure elements are a few of the characteristics that that can be
adjusted to
provide for differing closing force requirements. For example, a zipper at a
64 mil thickness
(1.6 mm) was found to have an average closing force of 0.15 lb. (0.07 kg.) for
the first
closure mechanism 138a and an average closing force of 0.05 lb. (0.02 kg.) for
the second
closure mechanism 138b. When the zipper thickness was increased to 75 mils
(1.9 mm) an
average closing force for the first closure mechanism 138a was found to be
0.18 lb. (0.08
kg.), an average closing force for the second closure mechanism 138b was found
to be 0.09
lb. (0.04 kg.).
[0034] In a further embodiment, a closure mechanism may comprise male and
female
closure elements that are both asymmetrical. FIG. 7 shows a zipper profile
that is similar to
FIG. 2, wherein first and second closure mechanisms 438a, 438b are provided
between first
and second pouch walls 26, 28. The first closure mechanism includes a first
male closure
element 440a and a first female closure element 440b. The first male closure
element 440a
comprises an asymmetrical male profile similar to those described above. The
first male
closure element 440a includes the body 60 extending from the base 54a, wherein
the
engagement member 62 is disposed on the end of the body 60. The first hook
portion 64
extends from the engagement member 62 toward the upper edge 42 of the pouch
20. The
first female closure element 440b comprises a symmetrical C-shaped profile
with first and
second spaced legs 56, 58. The first and second legs 56, 58 extend from the
base 54b. The
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-12-
second closure mechanism 438b includes a second male closure element 442a that
is similar
to the first male closure element 440a. The second male closure element 442a
includes the
body 74 extending from the base 68a, wherein the engagement member 76 is
disposed on the
end of the body 74. The second hook portion 78 extends from the engagement
member 76
toward the bottom portion 34 of the pouch 20 in the opposite direction of the
first hook
portion 64. The second female closure element 442b comprises an asymmetrical C-
shaped
profile that includes third and fourth spaced legs 444, 446, respectively,
wherein the third leg
444 is disposed closer to the upper edge 42 than the fourth leg 446. In a one
embodiment, the
third leg 444 is longer than the first, second, and fourth legs 56, 58, 446.
The longer third leg
444 increases the resistance of the second closure mechanism 438b to internal
opening forces.
[0035] The first and second male closure elements 440a, 442a have similar
opening
characteristics as discussed in the embodiments above. However, by providing
for longer
legs, such as the third leg 444 of FIG. 7, the opening forces of the closure
mechanisms may
be increased. For example, the longer third leg 444 of the second closure
mechanism 438b
forces the second female closure element 442b to flex more during internal
opening of the
pouch 20 than does the first female closure element 440b. Similar to the other
embodiments
discussed above, the first and second male closure elements 440a, 442a and the
respective
first and second female closure elements 440b, 442b, may be disposed on either
of the first
and second pouch walls 26, 28 and in any order with respect to the upper edge
42 of the
pouch as desired. It is also envisioned that additional closure mechanisms may
be provided
with at least one of the closure mechanisms utilizing a longer spaced leg.
[0036] The longer spaced leg 444 of FIG. 7 comprises an extension 450. The
extension
450 extends from the base 68b that is attached to the internal side 46 of the
first pouch wall
26 toward the internal side 48 of the second pouch wall 28. The extension 450
includes a
proximal portion 452 adjacent the base 68b and a distal portion 454 that abuts
the base 68a of
the second male closure element 442b and/or a proximal portion 456 of the body
74 when the
male and female closure elements 442a, 442b are engaged with one another. When
pressure
is applied from internal opening forces, the distal portion 454 of the
extension 450 creates a
contact point 458 against the base 68a and/or the proximal portion 456 of the
body 74. FIG.
8 shows another embodiment of the present invention similar to the embodiment
of FIG. 7.
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-13-
Instead of an extension 450, the third spaced leg 444 includes a wedge portion
460. The
wedge portion 460 extends from the base 68b toward the second pouch wall 28.
The wedge
portion includes a proximal portion 462, a medial portion 464 and a distal
portion 466. The
proximal portion 462 of the wedge portion 460 is adjacent the base 68b, while
the distal
portion 466 is closest to the second pouch wall 28. The medial portion 464 is
disposed
between the proximal portion 462 and the distal portion 466 and extends closer
to the bottom
portion 34 of the pouch 20 than the proximal and distal portions 462, 466. The
medial
ortion 464 defines a trou h or wed e sha e= When is applied from internal
opening
g g P pressure g
forces, the medial portion 464 creates a contact point 468 against the body 74
and the distal
portion creates a contact point 470 against the base 68a of the second male
closure element
442a and/or the internal side 48 of the opposing pouch wall 28. By increasing
the length
and/or shape of the legs of the second female closure elements 442b, an
increase in the
amount of force and/or flexure may be needed to open the second closure
mechanism 438b of
some embodiments.
[0037] In a different embodiment of the present invention, two or more female
closure
elements include a longer spaced leg, such as the longer legs of FIGS. 7 and
8. Some of these
embodiments include longer legs disposed in opposing directions, wherein one
leg increases
the internal opening force of a closure mechanism while the other longer leg
increases the
external opening force of a different closure mechanism. Indeed, some
embodiments include
female closure elements with both spaced legs being longer to provide for an
overall increase
in the external and internal opening forces required to open the closure
mechanism. For
example, FIG. 9 shows an embodiment that utilizes two longer spaced legs. A
first closure
mechanism 538a comprises a first male closure element 540a and a first female
closure
element 540b, wherein the male closure element 540a, which is similar to the
asymmetrical
male closure elements described above, has the first hook portion 64 extending
toward the
upper edge 42 of the pouch 20. A second closure mechanism 538b comprises a
second male
closure element 542a and a second female closure element 542b, wherein the
second male
closure element 542b has the second hook portion 78 extending toward the
bottom portion 34
of the pouch 20 in the opposite direction of the first hook portion 64. The
first female closure
element 540b includes a first spaced leg 544 and a second longer spaced leg
546 that includes
an extension 548, wherein the first spaced leg 544 is closer to the upper edge
42 than the
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-14-
extension 548. The second female closure element 542b includes a third longer
spaced leg
550 that includes an extension 552 and a fourth spaced leg 554, wherein the
third longer
spaced leg 550 is closer to the upper edge 42 than the extension 552. The
extension 548 of
the first female closure element 540b provides additional resistance against
external opening
forces, while the extension 552 of the second female closure element 542b
provides
additional resistance against internal opening forces. Specifically, when an
internal opening
force is exerted on the pouch 20, a distal portion 556 of the extension 552
abuts the base 68a
of the second male closure element 542a and/or a proximal portion 558 of the
body 74 to
create a contact point 560. When an external opening force is applied to the
pouch 20, a
distal portion 562 of the extension 548 abuts the base 54a of the first male
closure element
540a and/or a proximal portion 564 of the body 60 to create a contact point
566.
[0038] FIG. 10 depicts a similar embodiment to that shown in FIG. 9. However,
instead
of the first hook portion 64 being directed toward the upper edge 42, the
first hook portion 64
is directed toward the bottom portion 34 of the pouch 20. Also, the second
hook portion 78 is
directed toward the upper edge 42. The first leg 544 has the extension 548 as
opposed to the
second spaced leg 546, and the fourth spaced leg 554 has the extension 552 as
opposed to the
third spaced leg 550. Therefore, the extension 548 of the first female closure
element 540b
provides for additional resistance against internal opening forces, while the
extension 552 of
the second female closure element 542b provides for additional resistance
against external
opening forces.
[0039] FIG. 11 shows yet another embodiment of the present invention. In this
embodiment, both the first and second female closure elements 540b, 542b are
disposed on
the second pouch wall 28, while the first and second male closure elements
540a, 540b are
disposed on the first pouch wall 26. Also, the lengths of the extensions 548,
552 have been
selected to be sufficiently long enough to press against the opposing first
side pouch wall 26.
Because the first leg 544 and the fourth leg 554 have increased lengths, the
first and second
pouch walls 26, 28 are pushed outwardly at areas above the first spaced leg
544 (toward the
upper edge 42) and below the fourth spaced legs 554 (toward the bottom portion
34). The
engagement of the legs 544 and 554 with the first pouch wall 26 also forces
the first and
second pouch walls 26, 28 inwardly at an area below the first leg 544 and
above the fourth
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-15-
leg 554. A channel 568 is therefore created between the first and fourth legs
544, 554.
Similar to the embodiment depicted in FIG. 6, the channel 568 may be used to
guide the
user's fingers during closure of the pouch 20.
[0040] FIG. 12 shows another embodiment of a closure mechanism according to
the
present invention. Similar to previous embodiments disclosed above, a first
closure
mechanism 638a includes first male and female closure elements 640a, 640b,
respectively,
that are symmetrical. The first male closure element 640a includes an
engagement member
642 that has two hook portions 644a, 644b extending therefrom. The first male
closure
element 640a also includes a body 646 extending from a base 648a, wherein the
engagement
member 642 is disposed on an end of the body 646. The first female closure
element 640b
comprises a C-shaped profile that includes first and second spaced legs 650,
652 extending
from a base 648b. The first and second spaced legs 650, 652 further include
first and second
female hook portions 653a, 653b, respectively, on distal ends thereof.
[0041] A second closure mechanism 638b includes second male and female closure
elements 654a, 654b, respectively, that are asymmetrical. The asymmetrical
second male
closure element 654a is similar to the male elements described above, wherein
the second
male closure element 654a includes a body 656 extending from a base 658a. An
engagement
member 660 is disposed on an end of the body 656 and a hook portion 662
extends from the
engagement member 660 toward the bottom portion 34 of the pouch 20. The hook
portion
662 is smaller (i.e., has a lesser top-to-bottom extent as seen in FIG. 12) as
compared to the
hook portions found in the embodiments of FIGS. 2-5. The second female closure
element
654b comprises an asymmetrical C-shaped profile with third and fourth spaced
legs 664, 666.
The third and fourth spaced legs 664, 666 extend from a base 658b, wherein
distal ends of the
third and fourth spaced legs 664, 666 include third and fourth female hook
portions 668, 670,
respectively.
[0042] FIG. 13 depicts the third and fourth female hook portions 668, 670
having a width
D and E, respectively, and a length F and G, respectively. In the present
embodiment, the
width D and length F of the third female hook portion 668 are smaller than the
width E and
length G, respectively, of the fourth female hook portion 670 (the width D and
length F may
also be smaller than the corresponding dimensions of hook portions of the
previous
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-16-
embodiments). Therefore, the third female hook portion 668 is thinner than the
fourth female
hook portion 670. The decreased size (i.e., the width and/or the length) of
the third female
hook portion 668 in comparison with the fourth female hook portion 670, in
combination
with the reduced size of the hook portion 662, cause the second closure
mechanism to exhibit
a decreased closing force. The decreased closing force arises from the fact
that the third and
fourth spaced legs 664, 666 do not have to stretch as far around the second
male closure
element 654a during closing. In addition, the third female hook portion 668 is
flexible to
further reduce closing force, but has sufficient rigidity to hold tightly to
the male closure
element 654a and thereby reduce leakage.
[0043] In another embodiment, the width D and/or the length F of the third
female hook
portion 668 are larger than the width E and length G, respectively, of the
fourth female hook
portion 670. The larger third female hook portion 668 therefore provides for
an increase in
the closing force of the second closure mechanism 638b. In some embodiments,
the external
and internal opening forces are also increased when the width D and/or the
length F are
increased. By varying the width and length of single or multiple female hook
portions in
different closure mechanisms, numerous combinations of increased and/or
decreased opening
and/or closing forces may be obtained. Similar to the other embodiments
discussed above,
the first and second female closure elements 640b, 654b and the respective
first and second
male closure elements 640a, 654a, may be disposed on either of the first and
second pouch
walls 26, 28 and in any order with respect to the upper edge 42 of the pouch
as desired. It is
also envisioned that additional closure mechanisms (i.e., three or more) may
be provided with
at least one of the spaced legs of one or more of the closure mechanisms
having a hook
portion larger than a hook portion of another spaced leg of the same closure
mechanism(s).
[0044] It should be readily apparent to those skilled in the art that numerous
combinations of symmetric and asymmetric male and female closure elements are
possible to
create pouches with a multitude of differing opening and closing forces. The
number of
closure mechanisms and the order and placement on the pouch walls may be
varied to adjust
the opening and closing characteristics of the pouch. Additionally, it is
envisioned that
various other closure characteristics, such as tactile feedback, aural
feedback, etc., can be
used in conjunction with the aforementioned embodiments of the present
invention.
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-17-
[0045] In any of the embodiments illustrated in FIGS. 3-6, a pouch may include
at least
three closure mechanisms that are adjacent each other but spaced from one
another by a
distance that is sufficiently small to create the perception that the
mechanisms act as a single
closure. In addition, the closure mechanisms are preferably disposed
sufficiently far apart
such that a user's finger(s) and/or thumb are guided during the closing
operation. Similar to
the dual closure mechanism embodiments above, these results are accomplished
by spacing
adjacent closure mechanisms between about 0.05 inch (1.27 mm) and 0.15 inch
(3.81 mm)
apart, and, more preferably, between about 0.08 inch (2.03 mm) and about 0.12
inch (3.05
mm) apart and most preferably about 0.1 inch (2.54 mm) apart, although
different spacing
may instead be used.
[0046] For example, in the embodiment depicted in FIG. 4, the first closure
mechanism
138a is adjacent the second closure mechanism 138b but is spaced a first
distance therefrom.
The second closure mechanism 138b is adjacent the third closure mechanism 138c
but is
spaced a second distance therefrom. The third closure mechanism 138c is
adjacent the fourth
closure mechanism 138d but is spaced a third distance therefrom. When the
pouch 20 is
closed, none of the closure mechanisms contact one another. In addition, no
closure elements
are disposed between adjacent closure mechanisms. In the present example, this
means there
is no closure element between the first and second closure mechanisms 138a,
138b, the
second and third closure mechanisms 138b, 138c, and the third and fourth
closure
mechanisms 138c, 138d. As noted above, the first, second, and third distances
are
sufficiently small enough to permit a user to concurrently close the first,
second, third, and
fourth closure mechanisms. Additionally, the first, second, and third
distances are
sufficiently large enough to assist in guiding the user during closure of the
pouch 20. Other
embodiments may utilize three closure mechanisms or more than four. In any
embodiment,
the distance between adjacent closure mechanisms may be adjusted so long as
the
aforementioned properties are still evident.
[0047] Further, in any of the embodiments depicted in FIGS. 3-6, the multiple
closure
mechanisms may include differing closure characteristics. For example, the
first closure
mechanism of FIG. 4 has a first closure characteristic, the second closure
mechanisms has a
second closure characteristic, the third closure mechanism may has a third
closure
CA 02568867 2006-12-04
WO 2005/120971 PCT/US2005/019121
-18-
characteristic, and the fourth closure mechanism has a fourth closure
characteristic. In any of
the embodiments depicted in FIGS. 3-6, one or more of the first, second,
third, and fourth
closure mechanisms may have a different closure characteristic than one or
more of the
remaining closure mechanisms. For example, the first closure characteristic
comprises the
first closure mechanism having a greater resistance to external opening forces
than one or
more of the remaining closure mechanisms. In another embodiment, the first
closure
characteristic comprises the first closure mechanism having a greater
resistance to internal
opening forces than one or more of the remaining closure mechanisms. In yet
another
embodiment, the first closure characteristic comprises the first closure
mechanism having a
greater resistance to closing forces than one or more of the remaining closure
mechanisms.
INDUSTRIAL APPLICABILTTY
[0048] The present invention comprehends multiple closure mechanisms that have
opening and closing force characteristics that can permit easy closing of a
pouch yet provide
a desired level of resistance against external and internal opening forces.
Thus, closing and
opening is improved and the expenditure of wasted effort by the user is
minimized.
[0049] Numerous modifications will be apparent to those skilled in the art in
view of the
foregoing description. Accordingly, this description is to be construed as
illustrative only and
is presented for the purpose of enabling those skilled in the art to make and
use the invention
and to teach the best mode of carrying out same. The exclusive rights to all
modifications
which come within the scope of the appended claims are reserved.
