U.S. patent application number 15/114166 was filed with the patent office on 2017-01-12 for valve assembly.
This patent application is currently assigned to Jackel International Limited. The applicant listed for this patent is Jackel International Limited. Invention is credited to Peter Angus, Matthew O'Brien, Richard Parker, James Roe, Jason Roebuck.
Application Number | 20170007050 15/114166 |
Document ID | / |
Family ID | 57730323 |
Filed Date | 2017-01-12 |
United States Patent
Application |
20170007050 |
Kind Code |
A1 |
Parker; Richard ; et
al. |
January 12, 2017 |
Valve Assembly
Abstract
A valve assembly for a drinking vessel which includes a first
valve portion having a fluid outlet and a second valve portion
including a flexible diaphragm having a blocking portion movable
from a closed sealing position to an open position with the second
valve portion holding the flexible diaphragm relative to the first
valve portion such that when the flexible diaphragm is in the
closed sealing position the blocking portion seals the fluid outlet
of the first valve portion to prevent fluid flow therethrough, the
second valve portion further includes one or more apertures formed
therein and spaced from the blocking portion such that a fluid flow
path is formed from the fluid outlet of the first valve portion to
at least one of the apertures of the second valve portion when the
blocking portion is moved from the closed sealing position to the
open position.
Inventors: |
Parker; Richard; (Newcastle
Upon Tyne, GB) ; O'Brien; Matthew; (Newcastle Upon
Tyne, GB) ; Roe; James; (Glossop, Derbyshire, GB)
; Roebuck; Jason; (Glossop, Derbyshire, GB) ;
Angus; Peter; (Newcastle Upon Tyne, GB) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Jackel International Limited |
Northumberland |
|
GB |
|
|
Assignee: |
Jackel International
Limited
Northumberland
GB
|
Family ID: |
57730323 |
Appl. No.: |
15/114166 |
Filed: |
January 28, 2015 |
PCT Filed: |
January 28, 2015 |
PCT NO: |
PCT/EP2015/051728 |
371 Date: |
July 26, 2016 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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14570476 |
Dec 15, 2014 |
|
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15114166 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A47G 19/2272 20130101;
Y10T 29/49405 20150115; B65D 47/24 20130101; F16K 15/144 20130101;
B65D 47/32 20130101 |
International
Class: |
A47G 19/22 20060101
A47G019/22; B65D 47/32 20060101 B65D047/32; B65D 47/24 20060101
B65D047/24 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 29, 2014 |
GB |
1401497.1 |
Jun 19, 2014 |
GB |
1410978.9 |
Claims
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73. A valve assembly for a drinking vessel, comprising: a first
valve portion having a fluid outlet formed therein; a second valve
portion including a flexible diaphragm having a blocking portion
movable from a closed sealing position to an open position; the
second valve portion holding the flexible diaphragm relative to the
first valve portion such that when the flexible diaphragm is in the
closed sealing position the blocking portion of the flexible
diaphragm seals the fluid outlet of the first valve portion to
prevent fluid flow therethrough; wherein the second valve portion
further includes one or more apertures formed therein and spaced
from the blocking portion of the flexible diaphragm such that a
fluid flow path is formed from the fluid outlet of the first valve
portion to at least one of the apertures of the second valve
portion when the blocking portion of the flexible diaphragm is
moved from the closed sealing position to the open position.
74. The valve assembly of claim 73 wherein the one or more
apertures formed in the second valve portion are formed in the
flexible diaphragm.
75. The valve assembly of claim 73 wherein the second valve portion
further comprises a frame coupled to the flexible diaphragm and the
one or more apertures are formed in the frame.
76. The valve assembly of claim 75 wherein the frame of the second
valve portion holds the perimeter of the flexible diaphragm in
place relative to the first valve portion.
77. The valve assembly of claim 73 wherein the flexible diaphragm
of the second valve portion is sealingly tensioned over the fluid
outlet of the first valve portion when the flexible diaphragm is in
the closed sealing position.
78. The valve assembly of claim 73 wherein the blocking portion of
the flexible diaphragm comprises a central portion of the diaphragm
and is impermeable to the passage of liquid.
79. The valve assembly of claim 73 wherein the fluid outlet of the
first valve portion is a first fluid outlet and wherein the valve
assembly further comprises a second fluid outlet.
80. The valve assembly of claim 79 wherein the valve assembly is
arranged to couple to a lid of a drinking vessel with the second
fluid outlet located within the drinking cup when the drinking cup
is joined to the lid such that when suction is applied to a
drinking hole of the drinking cup the flexible diaphragm is caused
to lift off the first fluid outlet of the first valve portion
thereby allowing fluid in the vessel to flow from the first fluid
outlet to the second fluid outlet.
81. The valve assembly of claim 80 wherein the flexible diaphragm
is arranged to lift off the first fluid outlet of the first valve
portion in a substantially similar direction to a direction of
fluid flow through the first fluid outlet.
82. The valve assembly of claim 73 wherein the valve assembly is
arranged to be integrated in a base of a drinking vessel for
venting air into the drinking vessel.
83. The valve assembly of claim 73 wherein at least a portion of
the second valve portion adjacent the flexible diaphragm comprises
a crenelated perimeter.
84. The valve assembly of claim 73 wherein the second valve portion
is formed of a slightly compressible silicone material.
85. The valve assembly of claim 73 wherein the fluid outlet
comprises a bowed portion arranged to cause a corresponding bowing
in the blocking portion of the flexible diaphragm when in the
closed sealing position.
86. The valve assembly of claim 73 further comprising an air inlet
and a further flexible diaphragm arranged to seal off the air
inlet.
87. The valve assembly of claim 73 wherein the valve assembly is
arranged to couple to a drinking spout of a drinking vessel, and
wherein the flexible diaphragm is arranged relative to the drinking
spout such that when the flexible diaphragm moves from the closed
sealing position to the open position the blocking portion of the
flexible diaphragm is arranged to move in a direction substantially
non-parallel to a direction of fluid flow through the drinking
spout.
88. The valve assembly of claim 87 further comprising an air inlet
and a further flexible diaphragm arranged to seal off the air inlet
wherein the valve assembly is further arranged such that when
suction is applied to the drinking hole the further flexible
diaphragm is caused to lift off the air inlet thereby allowing air
to flow into the drinking vessel.
89. A drinking vessel comprising a valve assembly, the valve
assembly comprising: a first valve portion having a fluid outlet
formed therein; a second valve portion including a flexible
diaphragm having a blocking portion movable from a closed sealing
position to an open position; and the second valve portion holding
the flexible diaphragm relative to the first valve portion such
that when the flexible diaphragm is in the closed sealing position
the blocking portion of the flexible diaphragm seals the fluid
outlet of the first valve portion to prevent fluid flow
therethrough; wherein the second valve portion further includes one
or more apertures formed therein and spaced from the blocking
portion of the flexible diaphragm such that a fluid flow path is
formed from the fluid outlet of the first valve portion to at least
one of the apertures of the second valve portion when the blocking
portion of the flexible diaphragm is moved from the closed sealing
position to the open position.
90. The valve assembly of claim 89 wherein the fluid outlet of the
first valve portion is a first fluid outlet and wherein the valve
assembly further comprises a second fluid outlet.
91. The valve assembly of claim 90 wherein the valve assembly is
arranged to couple to a lid of a drinking vessel with the second
fluid outlet located within the drinking cup when the drinking cup
is joined to the lid such that when suction is applied to a
drinking hole of the drinking cup the flexible diaphragm is caused
to lift off the first fluid outlet of the first valve portion
thereby allowing fluid in the vessel to flow from the first fluid
outlet to the second fluid outlet.
92. The valve assembly of claim 91 wherein the flexible diaphragm
is arranged to lift off the first fluid outlet of the first valve
portion in a substantially similar direction to a direction of
fluid flow through the first fluid outlet.
93. The valve assembly of claim 89 wherein the fluid outlet
comprises a bowed portion arranged to cause a corresponding bowing
in the blocking portion of the flexible diaphragm when in the
closed sealing position.
94. A drinking vessel comprising a valve assembly, the valve
assembly comprising: a first valve portion having a fluid outlet
formed therein; a second valve portion including a flexible
diaphragm having a blocking portion movable from a closed sealing
position to an open position; the second valve portion holding the
flexible diaphragm relative to the first valve portion such that
when the flexible diaphragm is in the closed sealing position the
blocking portion of the flexible diaphragm seals the fluid outlet
of the first valve portion to prevent fluid flow therethrough; the
second valve portion further includes one or more apertures formed
therein and spaced from the blocking portion of the flexible
diaphragm such that a fluid flow path is formed from the fluid
outlet of the first valve portion to at least one of the apertures
of the second valve portion when the blocking portion of the
flexible diaphragm is moved from the closed sealing position to the
open position; wherein the valve assembly is arranged to couple to
a lid of a drinking vessel with the second fluid outlet located
within the drinking cup when the drinking cup is joined to the lid
such that when suction is applied to a drinking hole of the
drinking cup the flexible diaphragm is caused to lift off the first
fluid outlet of the first valve portion thereby allowing fluid in
the vessel to flow from the first fluid outlet to the second fluid
outlet, and the flexible diaphragm is arranged to lift off the
first fluid outlet of the first valve portion in a substantially
similar direction to a direction of fluid flow through the first
fluid outlet.
95. The valve assembly of claim 94 wherein the fluid outlet
comprises a bowed portion arranged to cause a corresponding bowing
in the blocking portion of the flexible diaphragm when in the
closed sealing position.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a valve assembly, and in
particular to a valve assembly for a drinking cup. In some
embodiments, the invention relates to a novel valve assembly for
use with a no-spill infant drinking cup.
BACKGROUND TO THE INVENTION
[0002] It is common for infant cup valve assemblies, and their
respective components, to be formed from various types of plastic,
and as such injection moulding is a common manufacturing method.
However, valve assemblies often comprise complex arrangements of
small components. This has traditionally led to the components
being moulded separately and subsequently being assembled during
manufacture to form the completed valve assembly. Thus, different
moulds are required depending on the size, form and desired type of
material to be used when forming the valve assembly components.
These parts may then need to be glued or otherwise coupled together
during manufacture. For example, in EP2134617B1, there is described
a no-spill infant cup valve assembly. The assembly, however,
consists of at least two separately moulded parts, and therefore
requires at least one assembly step during the manufacturing
process. In addition, the valve requires the user to reassemble it
by coordinating small locating features every time the valve is
removed for cleaning; failure to reassemble the valve correctly
results in liquid leaking from the cup. Clearly, therefore, there
is a need for both an improved method of manufacture, and a simpler
valve assembly, which can benefit from reduced cost and
manufacturing time.
[0003] One type of well-known drinking cup is the so-called
no-spill drinking cup, suitable for infant usage. The aim of a
no-spill cup and associated valve is to provide a cup which allows
the contents of the cup to escape through the valve only upon usage
by the user, for example via the application of suction.
Suction-operated valves may sometimes be referred to as `demand
valves` to differentiate them from other non-spill valves, such as
`bite valves`, which are opened by the user temporarily deforming
the closure device with their teeth or lips to allow liquid to
escape. A demand valve incorporated into a no-spill cup should
therefore prevent the contents of the cup from escaping when for
example when the cup is vigorously shaken, when the cup is
inverted, or when the cup is accidentally dropped. However, there
is always a risk that such a valve having, for example, a flexible
component designed to move in response to a pressure differential
can be easily deformed by the impact of liquid on the component,
which often occurs during such shaking or dropping. Thus,
undesirable leakage can occur. Conversely, a user should not have
to apply excessive suction in order to open the valve. There is
therefore a need in the art for a valve assembly suitable for a
drinking cup in which an improved seal is provided, whilst ensuring
that a user is not inconvenienced when using the drinking cup.
[0004] In EP2134617B1, the closure element relies on a stem that
passes through the same channel that the liquid flows through.
There is therefore only a small space around the stem for liquid to
flow and flow rate is limited accordingly. If the stem were made
narrower (to allow more water to flow around it), there may not be
sufficient closure force on the `mushroom head` to seal the valve
closed, and the mushroom head may become difficult to install by
pushing through the channel. Alternatively, if the mushroom head
and liquid channel were made larger relative to the stem, to
accommodate more flow, then the head may become too flexible to cap
the channel inlet.
[0005] It is also a known problem with demand valves that control
liquid flow via a slit in a flexible material that they have a
tendency to `heal` (see for example EP1014839B1). This can affect,
for example, slits in silicone diaphragms and may mean that the
material can repair itself during shipping so that the user finds
difficulty in getting the valve to work when they first try to use
it.
[0006] The present invention seeks to address these and other
disadvantages encountered in the prior art, by providing an
improved valve assembly for a drinking cup.
SUMMARY OF THE INVENTION
[0007] In a first aspect of the present invention, there is
provided a valve assembly for a drinking cup. The valve assembly
comprises a first arm having a first valve portion and a second arm
having a second valve portion. Each valve portion has a respective
aperture for fluid flow. The valve assembly is foldable from an
unfolded state to a folded state, such that the first arm is
movable relative to the second arm. This allows the first valve
portion to be engaged with the second valve portion to form, in the
folded state, a fluid flow path between the first and second
apertures.
[0008] The inventive valve assembly, hereinafter referred to as an
assembly, chassis or frame, may be used with any type of drinking
cup or vessel, such as an infant drinking cup or beaker. The valve
assembly may be particularly well suited for use with a no-spill
drinking cup as described above. The provision of first and second
arms, which may take a variety of forms and structures, may allow
the assembly to be moulded in a single part according to known
techniques. The arms of the assembly may also be referred to as,
for example, extending members, appendages, attachments or
limbs.
[0009] The first and second valve portions may be sub-components or
sub-units of a completed valve. For example, one of the valve
portions may comprise a valve seat whilst the second valve portion
may be arranged to receive a flexible valve face. Only when the
first and second valve portions are brought together may the two
function together as a completed valve. The valve portions may be
located at any position on their respective arms such that when one
arm is moved relative to the other the valve portions may be
brought into engagement.
[0010] Each valve portion may comprise one or more apertures formed
therein. In particular, the apertures may be designed such that,
when the first and second valve portions are brought into
engagement, only some of the apertures may be arranged to allow
fluid flow therethrough, whilst others may be designed to be sealed
off with a flexible member or other diaphragm.
[0011] The folding of the first arm relative to the second arm may
take place along a predetermined fold line or other point along
which folding, rotating or bending may take place. The engagement
of the first valve portion with the second valve portion may
comprise a non-fixed joining or contacting of the two valve
portions, or may also comprise more permanent attachment such as
coupling or fixed connection of one valve portion to the other.
[0012] The assembly may also comprise a third arm. The valve
assembly may be further foldable such that the third arm is movable
relative to the first and second arms. The third arm may be rotated
or moved relative to the first arm, the second arm, or both. The
third arm may also be joined to only of the first and second arms,
or both.
[0013] The third arm may also comprise a locking mechanism for
locking the first and second valve portions together in the folded
state. The provision of a locking mechanism may ensure that the
first and second arms do not detach or spring apart post-assembly.
Even without the locking mechanism, the engagement of the third arm
with the first and/or second arms may serve to reinforce the
coupling or engagement of the first and second valve portions. The
third arm may incorporate a spout, and may also incorporate
attachment means to a drinking cup.
[0014] The third arm may comprise a third aperture. In the folded
state, the third arm may engage at least one of the first and
second valve portions to form a fluid flow path between the first,
second and third apertures. Thus, when in the folded state, a fluid
flow path may be formed through the valve assembly, running from
each of the apertures of the first and second valve portions and
the third arm.
[0015] In the folded state, the first and second valve portions may
be detachably interlocked, for example, with a locking tab and
clasp, or by other means known in the art. Advantageously, when a
user wishes to clean the valve components, the locking mechanism
may be disengaged and the assembly reverted to its unfolded state
for cleaning. Such unfolding is generally a simple process. The
valve assembly components can then be cleaned, and the assembly can
be easily returned to the folded state.
[0016] In the folded state the first and second valve portions may
be engaged to form a demand valve. A demand valve may be defined as
a valve that switches from a closed to an open configuration due to
suction.
[0017] A length of the fluid flow path may be less than a width of
the valve assembly. Other lengths of fluid flow paths are
contemplated within the scope of this disclosure. Thus, the
inventive assembly may avoid the more tortuous and lengthy flow
paths that are associated with prior art valve assemblies. Such
tortuous flow paths generally require the sucking out of a lot of
air before liquid arrives, and generate a relatively higher amount
of drag/friction as a result of their long flow paths.
[0018] The valve assembly may further comprise a flexible
diaphragm. The flexible diaphragm may comprise at least one
aperture. The diaphragm may comprise apertures of different shapes
and sizes, positioned at different points on the diaphragm. This
set of apertures may correspond to the type in either of the first
or second valve portions which is not sealed off with a flexible
member or other diaphragm. The diaphragm may also be referred to
herein as a membrane, flexible cover, valve face or other such
term. The flexible diaphragm may be coupled to one of the first and
second arms such that in the folded state the flexible diaphragm
may act to block the fluid flow path between the aperture(s) in the
first and second valve portions. Thus, when the first and second
valve portions are engaged to one another, a completed valve may be
formed such that the flexible diaphragm may block the fluid flow
path and at times flex so as to open the fluid flow path.
[0019] In the folded state, a blocking portion of the flexible
diaphragm may act to block the fluid flow path between the first
and second apertures. The blocking portion may be spaced from an
aperture formed within the flexible diaphragm. The blocking portion
may be a central portion of the flexible diaphragm.
[0020] In the folded state the flexible diaphragm may be sealingly
coupled to at least one of the first and second valve portions. The
flexible diaphragm may be positioned so as to seal off the aperture
in the first/second valve portion.
[0021] The first arm may further comprise a third valve portion.
The second arm may further comprise a fourth valve portion. Each of
the third and fourth valve portions may have a respective aperture
for air flow. Thus, an air valve may be incorporated into the valve
assembly.
[0022] The valve assembly may be foldable from an unfolded to a
folded state such that the first arm is movable relative to the
second arm, to allow the third valve portion to be engaged with the
fourth valve portion and to thereby form in the folded state an air
flow path between the third and fourth apertures.
[0023] The valve assembly may further comprise a second flexible
diaphragm. The second flexible diaphragm may comprise at least one
aperture. The second flexible diaphragm may be coupled to one of
the first and second arms such that in the folded state the second
flexible diaphragm acts to block the air flow path between the
third and fourth apertures. Thus, much like the first flexible
diaphragm, the second flexible diaphragm may combine with the third
and fourth valve portions to form a completed valve, such that the
second flexible diaphragm may block the fluid flow path and at
times flex so as to open the fluid flow path through the third and
fourth valve portions.
[0024] In the folded state, a blocking portion of the second
flexible diaphragm may act to block the air flow path between the
third and fourth apertures. The blocking portion being spaced from
an aperture formed within the second flexible diaphragm. The
blocking portion may be a central portion of the second flexible
diaphragm.
[0025] The valve assembly may further comprise a gripping member
extending away from a plane of the valve assembly. The gripping
member may takes various shapes and sizes, and is primarily
designed to allow a user to easily handle the valve assembly
(especially in its folded state), for example by assisting in
engaging or disengaging the valve assembly with a lid of a drinking
cup.
[0026] In a further aspect of the present invention, there is
provided a method of manufacturing a valve assembly for a drinking
cup. The method comprises moulding a first arm and a second arm,
the first and second arms being coupled to one another. The first
arm has a first valve portion and the second arm has a second valve
portion. Each valve portion has a respective aperture for fluid
flow. A fold line is formed in the valve assembly such that the
valve assembly is foldable from an unfolded state to a folded
state, and such that the first arm is movable relative to the
second arm to allow the first valve portion to be engaged with the
second valve portion. A fluid flow path is therefore formed between
the first and second apertures.
[0027] Advantageously, the fold line allows the first arm to be
moved relative to the second arm so as to bring valve portions into
engagement with one another. According to this method, a relatively
complex valve may therefore be formed in a single moulding process.
By forming the valve as different valve portions located on
different arms, the valve portions can then be brought together and
engaged without the need to manufacture them as separate,
individual parts.
[0028] The method may further comprise moulding a first flexible
diaphragm such that the first flexible diaphragm is coupled to the
first arm.
[0029] The method may further comprise moulding a second flexible
diaphragm such that the second flexible diaphragm is coupled to the
first or second arm.
[0030] The first and second arms may comprise a first material,
such as a rigid plastic, for example polypropylene. The first
and/or second flexible diaphragms may comprise a second, different
material, such as a thermoplastic elastomer or silicone.
[0031] In a further aspect of the invention, there is provided a
method of using a valve assembly as described above. The method
comprises folding the valve assembly so as to move the first arm
relative to the second arm. The first valve portion is thus brought
into engagement with the second valve portion to form a fluid flow
path between the first and second apertures.
[0032] In a further aspect of the invention, there is provided a
valve assembly for a drinking cup. The valve assembly comprises a
liquid inlet, a liquid outlet, a blocking member, and a flexible
member arranged to seal against the blocking member. The valve
assembly further comprises a conduit extending from the liquid
inlet to the liquid outlet. The conduit comprises at least one bend
and is arranged such that fluid may flow from the liquid inlet,
past the bend and through the liquid outlet to at least indirectly
impinge the flexible member.
[0033] The blocking member may be any component or member arranged
to prevent the flow of liquid therethrough, and for example is
impervious to the passage of a liquid. The flexible member may take
different shapes and forms and may be arranged to form a seal
around at least a portion of the blocking member. The bend acts as
a baffle and may comprise any feature of the conduit designed to
induce a not insubstantial deviation in a flow path defined by the
conduit, such that a liquid flowing through the conduit will
undergo a velocity change. The bend may be curved or straight in
nature. The bend may have any suitable angle, and in one embodiment
is a right-angle bend. The conduit may be arranged such that liquid
exiting the conduit is directed directly onto the flexible member.
Alternatively, the liquid may be directed such that it may rebound
off a surface (for example the blocking member) and then in so
doing indirectly impinge the flexible member.
[0034] Advantageously, the bend or other similar deformation in the
conduit reduces the momentum of a liquid flowing through the
conduit such that the pressure exerted by the flowing liquid on the
flexible member is reduced. Thus, the seal of the flexible member
is improved and is weakened less over time through repeated usage
of the valve assembly. In prior art valve assemblies, liquid
generally impinges the flexible member without any slow-down effect
induced by one or more bends in a conduit, which can result in
weakening of the seal.
[0035] The blocking member may comprise a valve seat having the
liquid outlet formed therein. The flexible member may comprise a
flexible valve face arranged to seal against the liquid outlet so
as to prevent fluid flow therethrough.
[0036] The valve assembly may be arranged to couple to a lid of a
drinking cup with the liquid inlet located within the drinking cup
when the drinking cup is joined to the lid. When suction is applied
to a drinking hole of the drinking cup, the flexible member may be
caused to lift off the blocking member. Thus, the inventive valve
assembly may be incorporated with a drinking cup to provide an
improved drinking cup in which the valve's seal is stronger and
more durable as a result of the bent conduit.
[0037] The conduit may comprise a first section and a second
section. The first section may extend from the liquid inlet to the
bend, and the second section may extend from the bend to the liquid
outlet. Further sections in the conduit may be provided. For
example, the conduit may comprise a plurality of bends, each bend
acting to slow down the flow of liquid drawn through the conduit as
a user applies suction so as to consume the contents of the
cup.
[0038] The first and second sections may be substantially
linear.
[0039] The first section may be longer than the second section. In
other words, the bend may be located proximal or adjacent to the
liquid outlet such that the reduction in speed of the liquid is
maximised before the liquid exits through the liquid outlet. In one
embodiment, the first section is approximately 13 mm long and the
second section is approximately 5 mm long.
[0040] A cross-section of the first section may have a smaller
surface area than a corresponding cross-section of the second
section. Increasing the cross-section of the first section in this
manner may further improve the dampening or baffle-like effects of
the bend. In one embodiment, the cross-section of the first section
is approximately 8 mm.sup.2 and the cross-section of the second
section is approximately 12.5 mm.sup.2.
[0041] In a further aspect of the invention, there is provided a
valve assembly for a drinking cup. The valve assembly comprises a
valve seat having a liquid outlet formed therein. The valve
assembly further comprises a flexible valve face having a blocking
portion arranged to seal the liquid outlet so as to prevent fluid
flow therethrough. The flexible valve face comprises one or more
apertures formed therein and spaced from the blocking portion.
[0042] Thus, by having a blocking portion of a flexible valve face
seal a liquid outlet of the valve, the flexible valve face (and in
particular the blocking portion) may flex in the same direction as
liquid flowing through the liquid outlet, therefore making it
easier for a user to break the seal when using a drinking cup with
the inventive valve assembly. Thus, the valve assembly may make it
easier for the user to apply suction and open the valve.
[0043] The blocking portion may comprise a central portion of the
flexible valve face. The blocking portion may impermeable to the
passage of liquid. A peripheral portion of the flexible valve face
may be fixed to the valve seat. The peripheral portion may be
spaced from the blocking portion, and for example may form part of
a periphery of the flexible valve face. A periphery of the flexible
valve face may be fixed to the valve seat. The peripheral portion
may be spaced from the liquid outlet. The one or more apertures may
be formed adjacent the peripheral portion.
[0044] The valve assembly may further comprise a liquid inlet. The
valve assembly may be arranged to couple to a lid of a drinking cup
with the liquid inlet located within the drinking cup when the
drinking cup is joined to the lid. When suction is applied to a
drinking spout of the drinking cup, the flexible valve face may be
caused to lift off the liquid outlet, thereby allowing fluid in the
cup to flow from the liquid inlet to the liquid outlet.
[0045] The flexible valve face may be arranged to lift off the
liquid outlet in a substantially similar direction to a direction
of fluid flow through the liquid outlet.
[0046] The one or more apertures of the flexible valve face may be
located such that when the valve is closed (e.g. when the flexible
member seals off the aperture in the valve seat) the apertures in
the flexible valve face are not in fluid communication with the
aperture formed in the valve seat. In particular, the one or more
apertures of the valve face may be located substantially along a
periphery of the flexible valve face. A central portion of the
flexible valve face may seal off the aperture of the valve
seat.
[0047] At least a portion of the flexible valve face may be held
fixedly in a position (using any suitable means) such that the
blocking portion is sealingly tensioned over the liquid outlet. An
improved seal can be achieved as a result, as the tension in the
flexible member assists in creating the seal.
[0048] The valve assembly may further comprise an air inlet and a
flexible diaphragm arranged to seal off the air inlet. The valve
assembly may be further arranged such that when suction is applied
to the drinking hole the flexible diaphragm is caused to lift off
the air inlet, thereby allowing air to flow into the drinking cup.
Thus, an air valve may be provided which may serve to equalise the
pressure within the drinking cup when the valve assembly is in
use.
[0049] In a further aspect of the invention, there is provided a
valve assembly for a drinking cup. The valve assembly comprises a
valve seat having a liquid outlet formed therein. The valve
assembly further comprises a flexible valve face having a blocking
portion arranged to seal the liquid outlet so as to prevent fluid
flow therethrough. A peripheral portion of the flexible valve face
is fixed to the valve seat. This further aspect of the invention
may further comprise any of the above-described features.
[0050] In a further aspect of the invention, there is provided a
valve assembly as set out in the appended claims.
[0051] The first valve portion may comprise a part of the valve
assembly against which the flexible diaphragm (such as a valve face
or other flexible member) may seal against. Thus, the first valve
portion may comprise a valve seat or similar valve component. The
second valve portion may comprise a supporting frame or similar
structural member arranged to hold or fix the flexible diaphragm
relative to the first valve portion. The apertures may be formed in
either the flexible diaphragm, or a portion of the supporting
frame, or both.
[0052] The flexible diaphragm may be sealingly tensioned over the
fluid outlet such that the flexible diaphragm may take on a curved
or bowed appearance. The curve may be in a direction of fluid flow
through the fluid outlet.
[0053] The second valve portion adjacent the flexible diaphragm may
comprise a crenelated perimeter. The crenelations or other such
projections may improve the adhesion of the flexible diaphragm to
the supporting frame or other such element of the second valve
portion.
[0054] In some embodiments, the valve assembly may be integrated
into a drinking spout of a drinking vessel such that the valve
assembly may take on a substantially vertical orientation. Thus,
the movement of the diaphragm, and in particular the blocking
portion, may be substantially perpendicular, or at least
non-parallel, to the direction of fluid flow through the spout.
This design may be more space-efficient.
[0055] The fluid outlet may comprise a bowed portion arranged to
cause a corresponding bowing in the blocking portion when in the
closed sealing position. This may serve to improve the seal between
the blocking portion and the fluid outlet.
[0056] In a further aspect of the invention, there is provided a
valve assembly for a drinking vessel. The valve assembly comprises
a valve element having a supporting frame and a flexible diaphragm,
the supporting frame dividing the flexible diaphragm into first and
second diaphragm portions. The valve assembly further comprises a
movable valve base having a fluid outlet formed therein. The valve
base is arranged relative to the valve element such that the valve
base contacts the supporting frame with the second diaphragm
portion sealing the liquid outlet, and such that a tension in the
second diaphragm portion is independent of movement of the valve
base.
[0057] The first and second diaphragm portions may be integrally
formed with the supporting frame, or may be individual components
each attached to or otherwise coupled to the supporting frame.
[0058] The valve base may be arranged during movement to push
against the supporting frame. In particular, the valve base may be
arranged to move relative to the flexible diaphragm in a direction
of fluid flow through the fluid outlet.
[0059] During movement of the valve base, a tension in the second
diaphragm portion may remain substantially constant.
[0060] The valve base may be further arranged relative to the valve
element such that a tension in the first diaphragm portion may
depend on movement of the valve base. Thus, during movement of the
valve base a tension in the first diaphragm portion may change.
[0061] The valve base may be integrated into a base of a drinking
vessel.
[0062] Further embodiments of the invention are set out below. In
one such embodiment, there is provided a valve assembly adapted to
be connected to a lid of a drinking vessel comprising:
[0063] an upper case being engageable with the lid of the drinking
vessel, the upper case having a valve outlet, and an air inlet, the
air inlet having a valve seat,
[0064] a lower case having a liquid inlet, an air outlet, and a
liquid outlet, the liquid outlet having valve seat,
[0065] at least one flexible diaphragm interposed between the upper
case and lower case such that the flexible diaphragm seals both the
air inlet and the liquid outlet; and
[0066] wherein the upper case engages the lower case to form a
first fluid flow path between the liquid outlet and valve outlet
and a second fluid flow path between air inlet and air outlet.
[0067] Optionally, engagement of the upper case with the lower case
comprises a non-fixed joining or contacting of the two cases.
[0068] Optionally, a peripheral edge of the flexible diaphragm is
supported by a supporting frame.
[0069] Optionally, the flexible diaphragm is movable in response to
a reduced pressure in the valve outlet, the air outlet, or
both.
[0070] Optionally, the flexible diaphragm further comprises a first
flexible diaphragm arranged to block the liquid outlet, and a
second flexible diaphragm arranged to block the air inlet.
[0071] Optionally, the first flexible diaphragm and liquid outlet
are selectively closer to a liquid in the drinking vessel than the
second flexible diaphragm.
[0072] Optionally, a conduit extends from the liquid inlet to the
liquid outlet valve portion.
[0073] Optionally, the conduit further comprises at least one
bend.
[0074] In a further embodiment, there is provided a valve assembly
for a drinking vessel, comprising:
[0075] an upper case arranged to be removably attached to a lid of
the drinking vessel, the upper case having a valve outlet and air
inlet,
[0076] a lower case arranged to be coupled to the upper case, the
lower case having a liquid inlet, a liquid outlet, and an air
outlet,
[0077] an intermediate frame arranged to be located between the
upper case and the lower case, the intermediate frame supporting a
first flexible diaphragm and a second flexible diaphragm,
[0078] the first flexible diaphragm adapted to block the liquid
outlet,
[0079] the second flexible diaphragm adapted to block the air
inlet; and
[0080] wherein negative pressure in the valve outlet moves the
first flexible diaphragm up from the liquid outlet and negative
pressure in the air outlet moves the second flexible diaphragm down
from the air inlet.
[0081] In a further embodiment, there is provided a method of using
a valve assembly for a drinking vessel, the method comprising:
[0082] applying a pressure to the valve assembly, thereby folding
the valve assembly so as to move an upper case towards a lower
case,
[0083] aligning a first valve portion having a first aperture with
a second valve portion having a second aperture,
[0084] engaging the first valve portion with the second valve
portion; and
[0085] forming a fluid flow path between the first aperture and the
second aperture.
[0086] In a further embodiment, there is provided a valve assembly
for a drinking vessel, comprising:
[0087] a liquid inlet,
[0088] a liquid outlet,
[0089] a valve seat,
[0090] a flexible diaphragm, and
[0091] a conduit extending from the liquid inlet to the liquid
outlet; the conduit comprises at least one bend.
[0092] Optionally, the valve seat has the liquid outlet formed
therein, and the flexible diaphragm is arranged to seal against the
valve seat and block the fluid flow from the liquid outlet.
Optionally, the bend is a right-angle bend.
[0093] Optionally, the valve assembly further comprises:
[0094] a lid for enclosing the drinking vessel, the lid having a
liquid outlet tube,
[0095] the valve assembly being arranged to couple with the liquid
outlet tube; and
[0096] the liquid inlet is located within the drinking vessel when
enclosed with the lid.
[0097] Optionally, the conduit further comprises a conduit first
section and a conduit second section, the conduit first section
extending from the liquid inlet to the bend, and the conduit second
section extending from the bend to the liquid outlet.
[0098] In a further embodiment, there is provided a valve assembly
for a drinking vessel, comprising:
[0099] a valve portion having a fluid outlet,
[0100] a frame comprising:
[0101] at least one flexible diaphragm having a blocking portion
movable from a closed sealing position to an open position,
[0102] at least one aperture, the at least one aperture being
spaced from the blocking portion; and
[0103] wherein the frame positions the at least one flexible
diaphragm relative to the valve portion such that in the closed
sealing position the blocking portion seals the fluid outlet so as
to prevent fluid flow and in the open position a fluid flow path is
formed from the fluid outlet to the at least one aperture of the
frame.
[0104] Optionally, the valve assembly further comprises:
[0105] a lid for enclosing the drinking vessel, the lid having a
liquid outlet tube,
[0106] the valve assembly being arranged to couple with the lid;
and
[0107] wherein the flexible diaphragm is arranged relative to the
liquid outlet tube such that when moving from the closed sealing
position to the open position the blocking portion moves in a
direction parallel to a direction of fluid flow through the liquid
outlet tube.
[0108] Optionally, the valve assembly further comprises:
[0109] a lid for enclosing the drinking vessel, the lid having a
liquid outlet tube and an air inlet tube,
[0110] the valve assembly being arranged to couple with the
lid,
[0111] a second valve portion having an air inlet,
[0112] a second flexible diaphragm having a blocking portion
movable from a closed sealing position to an open position; and
[0113] wherein the frame positions the second flexible diaphragm
relative to the second valve portion such that suction applied to a
liquid outlet tube causes a blocking portion of the second flexible
diaphragm to lift off the air inlet, thereby allowing air to flow
through the air inlet tube into the drinking vessel.
[0114] Optionally, the flexible diaphragm is sealingly tensioned
over the fluid outlet such that the flexible diaphragm has a convex
shape and protrudes in a direction away from the fluid outlet.
[0115] Optionally, the drinking vessel is a cup or a bottle.
[0116] Optionally, at least a portion of the frame comprises a
crenelated perimeter.
[0117] Optionally, the frame is formed of a compressible silicone
material.
[0118] Optionally, the second flexible diaphragm is selectively
higher than the flexible diaphragm.
BRIEF DESCRIPTION OF THE DRAWINGS
[0119] A preferred embodiment of the invention will now be
described in connection with the accompanying drawings, of
which:
[0120] FIG. 1 is a first perspective view of a valve assembly in
accordance with an embodiment of the invention, shown in its
unfolded state;
[0121] FIG. 2 is a second perspective view of the valve assembly of
FIG. 1;
[0122] FIG. 3 is a perspective view of the valve assembly of FIG.
1, including the liquid and air diaphragms;
[0123] FIG. 4a is a first perspective view a liquid diaphragm in
accordance with an embodiment of the invention;
[0124] FIG. 4b is a second perspective view the liquid diaphragm of
FIG. 4a;
[0125] FIG. 5a is a first perspective view an air diaphragm in
accordance with an embodiment of the invention;
[0126] FIG. 5b is a second perspective view the air diaphragm of
FIG. 5a;
[0127] FIG. 6a is a perspective view of the valve assembly of FIG.
3 during folding;
[0128] FIGS. 6b and 6c show cross-sections of a hinge that may be
used with the valve assembly of FIG. 6a;
[0129] FIG. 7 is a perspective view of the valve assembly of FIG.
3, shown in its folded state;
[0130] FIG. 8 is a cross-sectional view of the valve assembly of
FIG. 7 with the liquid and air valves closed;
[0131] FIG. 9 is a cross-sectional view of the valve assembly of
FIG. 7 with the liquid and air valves open;
[0132] FIGS. 10a-10g are perspective views of components of a valve
assembly in accordance with embodiments of the invention;
[0133] FIG. 11 is a cross-sectional view of the valve assembly of
FIGS. 10a-10g with the liquid and air valves closed;
[0134] FIGS. 12a and 12b are perspective views of a valve assembly
in accordance with an embodiment of the invention, shown in its
unfolded state;
[0135] FIG. 12c is a perspective view of a valve assembly in
accordance with an embodiment of the invention, shown in its
unfolded state;
[0136] FIGS. 13a-17d are cross-sectional views of various valve
assemblies integrated into bottles for venting;
[0137] FIGS. 18a-21b are cross-sectional views of various valve
assemblies in accordance with alternative embodiments of the
invention; and
[0138] FIGS. 21c-21e show the valve assembly of FIGS. 21a and 21b
in greater detail.
DETAILED DESCRIPTION OF SPECIFIC EMBODIMENT
[0139] The present invention seeks to provide an improved valve
assembly for a drinking cup. Whilst various embodiments of the
invention are described below, the invention is not limited to
these embodiments, and variations of these embodiments may well
fall within the scope of the invention which is to be limited only
by the appended claims.
[0140] In accordance with a preferred embodiment of the invention,
there is shown in FIG. 1 a valve assembly 10 suitable for use with
a drinking cup, in particular an infant drinking cup. FIG. 2 shows
an underside of assembly 10. In FIGS. 1 and 2, assembly 10 is shown
in an unfolded or disassembled state.
[0141] Assembly 10 comprises three arms 12, 14 and 16. Arms 12 and
14 are joined to one another along fold line 11. Arm 14 is further
joined to arm 16 by means of hinge 13. Arm 12 is in line with arm
14, whilst arm 16 extends perpendicularly away from arm 14 and in
the same plane as arms 12 and 14. Whilst in the present embodiment
arms 12 and 14 are shown to have a substantially elongate shape,
the invention is not limited to such a shape and the arms may take
any other shape provided they can still carry out their intended
function, as will be described below in more detail.
[0142] At an end of arm 12 is located a first valve portion 15
having a central aperture 15a and four peripheral apertures 15b
disposed around the outside of central aperture 15a. Apertures 15a
and 15b are formed within a circular recess of arm 12 such that a
fluid flow path extends from one side of arm 12 to the other side
of arm 12, through each of apertures 15a and 15b.
[0143] Adjacent valve portion 15 is located a third valve portion
17, comprising a nozzle 18. Nozzle 18 comprises an aperture 19 such
that a fluid flow path is formed from one side of arm 12 to the
other side of arm 12, though aperture 19. Aperture 19 defines an
air inlet 19a and air outlet 19b (see FIGS. 8 and 9). In
particular, the fluid flow path extends from air inlet 19a of
nozzle 18, on an upper side of arm 12 (FIG. 1), to air outlet 19b
of nozzle 18, on a lower side of arm 12 (FIG. 2).
[0144] Arm 14 comprises second and fourth valve portions 21 and 20.
Valve portion 20, adjacent fold line 11, comprises a circular
recessed portion 22 with a central aperture 23a formed therein and
two peripheral apertures 23b located on either side of central
aperture 23a. Apertures 23a and 23b extend from one side of arm 14
such that a fluid flow path is formed from one side of arm 14 to
the other side of arm 14, through each of apertures 23a and
23b.
[0145] Adjacent valve portion 20, at the opposite end of arm 14, is
second valve portion 21. Valve portion 21 comprises a circular
recessed portion with an upwardly extending sealing wall 24 along
its periphery. Sealing wall 24 is topped with an angled portion in
the shape of an inverted V (see FIGS. 8 and 9 for more detail).
Within the centre of the recessed portion is a nozzle or liquid
outlet 25. As will be described below in more detail, valve portion
21 further comprises a conduit extending from a liquid inlet 26
formed in arm 14 and extending to liquid outlet 25. On the
underside of assembly 10 (best seen in FIG. 2) is located a
fin-like projection or gripping member 30, extending away from arm
14. In other embodiments gripping member 30 may extend in other
directions away from assembly 10.
[0146] Adjacent arm 14 and extending substantially perpendicularly
away from arm 14 is arm 16. Arm 16 comprises a central aperture or
bore 27 extending from one side of arm 16 to the opposite side of
arm 16, such that a fluid flow path is formed from the one end of
bore 27 to the other. Arm 16 comprises a locking member 28
engageable with a clasp 29 positioned on arm 14 and adjacent valve
portion 21.
[0147] Assembly 10 is moulded as a single part using techniques
known in the art, to obtain the shape and structure shown in FIGS.
1 and 2. The arrangement of the components of assembly 10 means
that all features can be moulded in the line of draw such that
assembly 10 can be moulded using a simple injection moulding tool.
In the illustrated embodiment, liquid inlet 26 is not arranged in
the line of draw but this could still be achieved, if required.
Assembly 10 is preferably moulded using polypropylene, although
other materials may be used, for example common rigid plastics
capable of injection-moulding such as polyethylene, nylon or
polyester.
[0148] Once assembly 10 is moulded, a pair of flexible diaphragms,
liquid diaphragm 40 and air diaphragm 50, are moulded in receptive
positions on assembly 10. For simplest manufacturing, the pair of
flexible diaphragms may be moulded immediately after moulding
assembly 10, for example by known co-moulding techniques, or they
may be moulded separately at a later time. In particular, liquid
diaphragm 40 is moulded in position over valve portion 15 to
acquire the shape shown in FIGS. 4a and 4b. Likewise, air diaphragm
50 is formed by moulding over valve portion 20 to acquire the shape
shown in FIGS. 5a and 5b. FIG. 3 shows assembly 10 in its unfolded
state following the moulding of liquid diaphragm 40 and air
diaphragm 50 in their respective positions over valves portions 15
and 20.
[0149] Both sides of liquid diaphragm 40 are shown in more detail
in FIGS. 4a and 4b. Liquid diaphragm 40 comprises a double-layered
disc-like shape with an internal recessed portion 41. Four
equally-spaced apertures 43b extend from one side of liquid
diaphragm 40 to its other side, each passing through a
double-walled peripheral section 42. Other shapes of liquid
diaphragm are contemplated within the scope of the invention. For
example, fewer or more apertures 43b may be incorporated into
liquid diaphragm 40. Liquid diaphragm 40 is made of a flexible
material, preferably a thermoplastic elastomer.
[0150] Air diaphragm 50 is illustrated in FIGS. 5a and 5b and
comprises a disc-shaped flexible member having a pair of apertures
53b extending through it, on opposite sides of the member. Air
diaphragm 50 further comprises a shallow, circular recessed portion
52 on one side of air diaphragm 50. Again, fewer or more apertures
53b may be incorporated into air diaphragm 50.
[0151] Returning to FIG. 3, as a result of the moulding, note that
apertures 43b are aligned with apertures 15b, and that apertures
53b are aligned with apertures 23b. Note also that liquid diaphragm
40 and air diaphragm 50 are preferably moulded with their recessed
portions, respectively 41 and 52, on the underside of the moulding,
as shown in FIG. 3.
[0152] Fold line 11 and hinge 13 are known as `live hinges`, which
are regions designed by their shape to be deformable and to allow
relative movement between two components of the same moulded
part.
[0153] In order to assemble valve assembly 10, assembly 10 must be
moved from an unfolded state (as in FIGS. 1 and 2) to a folded,
ready state. This is shown in more detail in FIG. 6a. Arm 12 is
first moved relative to arm 14 by folding assembly 10 along fold
line 11. When arm 12 is rotated through 180 degrees about fold line
11 and relative to arm 14, valve portion 15 is engaged with
corresponding valve portion 21 such that liquid diaphragm 40 is
sandwiched between arm 12 and arm 14. Similarly, valve portion 17
is engaged with corresponding valve portion 20 such that air
diaphragm 50 is sandwiched between arm 12 and arm 14.
[0154] In some cases folding of assembly 10 may be difficult due to
the restricted movement of fold line 11, and fold line 11 may be
placed under stress when folded and may cause distortion of
assembly 10 such that the seal formed around the air vent is
broken. One solution is to have a longer, more flexible fold line
or hinge that allows assembly 10 to be folded whilst ensuring arms
12 and 14 come together in parallel and without distortion. An
example of such an elongate hinge 11c is shown in FIG. 6c, whilst
FIG. 6b shows a shorter hinge 11b which may lead to distortion
during folding.
[0155] Once arm 12 has been rotated relative to arm 14, arm 16 is
then rotated using hinge 13 so as to bring it into engagement with
the underside of arm 12. Arm 16 therefore engages with valve
portion 15 and detachably locks arm 12 to arm 14 by means of
locking member 28 engaging with clasp 29. Locking member 28 and
clasp 29 may be based on known devices and may be chosen to be
permanently closed, to prevent unfolding by users, or to be
operable by users so that valve assembly 10 may be readily unfolded
and re-folded e.g. for thorough cleaning. However, it may be
possible to do away with arm 16 altogether by location of a
suitable clasp on arm 12.
[0156] In its folded state, ready for use, assembly 10 is shown in
more detail in FIG. 7. A cross-section of assembly 10 in its folded
state is shown in FIG. 8. As can be seen, air diaphragm 50 seals
against nozzle 18 so as to close off or cap air outlet formed by
aperture 19. When arm 12 is rotated relative to arm 14, nozzle 18
contacts the central portion of air diaphragm 50 and pushes the
central portion downwards, thereby tensioning air diaphragm 50
around the rim of aperture 19. The periphery of air diaphragm 50 is
held sealingly in place between valve portion 17 and valve portion
20. Apertures 23b of valve portion 20 are aligned with apertures
53b of air diaphragm 50.
[0157] Similarly, when arm 12 is rotated relative to arm 14, the
central blocking portion of liquid diaphragm 40 contacts the rim of
liquid outlet 25 in valve portion 21, which causes the central
blocking portion of liquid diaphragm 40 to be pushed upwards
relative to the periphery of liquid diaphragm 40. Thus, liquid
diaphragm 40 is tensioned around the rim of liquid outlet 25 so as
to seal off liquid outlet 25, and the central portion of liquid
diaphragm 40 takes on the shape of an inverted V. The periphery of
liquid diaphragm 40 is held sealingly in place by the engagement of
valve portion 15 with valve portion 21. In particular, sealing wall
24 is resiliently biased into double-walled peripheral section 42
of liquid diaphragm 40 so as to form a seal. Apertures 15b of valve
portion 15 are aligned with apertures 43b of liquid diaphragm
40.
[0158] Although not shown in FIG. 8, arm 16 serves to hold arm 12
in engagement with arm 14, thereby assisting with the engagement of
valve portion 15 with valve portion 21, and valve portion 17 with
the engagement of valve portion 20.
[0159] FIG. 8 also shows in more detail the conduit 50 extending
from liquid inlet 26 to liquid outlet 25. Conduit 50 comprises a
right-angle bend 51 such that bend 51 divides conduit 50 into a
first horizontal section starting at liquid inlet 26, and a second
vertical section ending at liquid outlet 25.
[0160] In use, valve assembly 10 in its folded state may be
incorporated into the lid of a drinking cup, especially an infant
drinking cup. For example, the lid may be arranged to receive and
engage with valve assembly 10. By grasping gripping member 30, a
user may more easily engage assembly 10 with the lid. Once assembly
and lid are coupled, the lid may be screwed on or otherwise placed
over a lidless drinking cup (such as a cup designed for engagement
with the particular lid), such that liquid inlet 21 and gripping
member 30 are positioned within the cup.
[0161] The lid preferably comprises a spout (or other apertured
element) for drinking from. When a user sucks on the spout,
pressure is reduced within a chamber 60 of assembly 10 (see FIGS. 8
and 9). The negative pressure causes the central blocking portion
of liquid diaphragm 40 to lift off liquid outlet 25 and thereby
break the seal between liquid diaphragm 40 and the rim of aperture
forming liquid outlet 25. A fluid flow path is then formed
extending from liquid inlet 26, past bend 51, through liquid outlet
25 and through apertures 15b and 43b of valve portion 21 and liquid
diaphragm 40, to reach chamber 60. Fluid may then flow from chamber
60 out through the spout. For example, if a user sucks on the spout
whilst the cup is up-ended, fluid may flow out from drinking cup
and into the user's mouth.
[0162] Recessed portions 41 and 52 of liquid diaphragm 40 and air
diaphragm 50 may vary in depth, or may even be absent, depending on
the thickness of diaphragms 40 and 50. For example, the thickness
of liquid diaphragm 40, and hence the depth of recessed portion 41,
can be adjusted to best balance the need for liquid diaphragm 40 to
respond to low suction levels, for example by being thin and easily
stretched, with the desire to retain enough tension in liquid
diaphragm 40 to reliably seal against liquid outlet 25. These
characteristics may also be adjusted by changing the grade of
elastomer for a harder or softer grade. Air diaphragm 50 may be
adjusted in the same manner.
[0163] As fluid is sucked from the drinking cup, the pressure
within the drinking cup decreases. This creates a negative pressure
within drinking cup which causes air diaphragm 50 to lift off of
air outlet 19 in a downwards manner, thereby breaking the seal
between air diaphragm 50 and nozzle 18. A fluid flow path is then
formed from air inlet 19a to air outlet 19b, such that air may flow
from air inlet 19a, through air outlet 19b, and subsequently
through apertures 23b and 53b of valve portion 20 and air diaphragm
50. Entry of air within drinking cup serves to equalise the
pressure within drinking cup such that suction on spout is not
impeded.
[0164] A further embodiment of a valve assembly in accordance with
the present invention is shown in FIGS. 10a-10g. Assembly 100 is
similar to assembly 10, though, unlike assembly 10, assembly 100 is
formed of three individually moulded components: upper case 110,
lower case 130 and intermediate frame 120 arranged to support two
flexible diaphragms 121 and 122.
[0165] Upper case 110 comprises valve outlet 111 and air inlet 112,
whilst lower case 130 comprises liquid outlet 131 and air outlet
132. As shown in FIG. 10c, intermediate frame 120 comprises two
central apertures 127 and 128 formed within rigid frame portion
123. Outer projecting wall 126 runs substantially along the
perimeter of intermediate frame 120. Although only one side of
intermediate frame 120 is shown in FIG. 10c, the other side of
intermediate frame 120 is identical. FIG. 10f shows intermediate
frame 120 with diaphragms 121 and 122 received and held in
respective central apertures 127 and 128.
[0166] A plurality of apertures or fluid outlets 124 are formed
within rigid frame portion 123 of intermediate frame 120, adjacent
central apertures 127 and 128. Thus, unlike apertures 43b and 53b
of assembly 10, apertures 124 are formed within rigid frame portion
123 as opposed to within diaphragms 121 and 122 themselves.
[0167] FIG. 10d shows a modified version of intermediate frame 120.
In this embodiment, in-between apertures 124 are located indents,
castellations or crenalations 125' formed within rigid frame
portion 123'. Projections 125' allow for an increased surface area
of diaphragms 121 and 122 to contact intermediate frame 120' so as
to aid adhesion and improve the seal between the co-moulded parts,
as can be seen in more detail in FIG. 10g.
[0168] Unlike intermediate frame 120 of FIG. 10d, intermediate
frame 120' comprises a notched aperture 129' for locating a
corresponding notch 129 in the underside of upper case 110, which
can be seen in more detail in FIG. 10e. Without notched aperture
129', intermediate frame 120 would be symmetrical between its upper
and lower faces, and there would be the possibility that
intermediate frame 120' could be loaded into lower case 130 upside
down and as a result diaphragm 121 may not engage and cap liquid
outlet 131 (as described in more detail below). Notched aperture
129' ensures intermediate frame 120' can only be loaded into lower
case 130 with diaphragm 121 in the correct orientation.
[0169] Intermediate frame 120 (or intermediate frame 120') may be
made from a rigid material over-moulded or co-moulded with a
second, flexible material. In particular, relatively rigid frame
portion 123 of intermediate frame 120 may be made from
polypropylene, whilst diaphragms 121 and 122 may be made from a
relatively flexible thermoplastic elastomer. Of course, other
materials may be used if desired.
[0170] In order to assemble assembly 100, diaphragms 121 and 122
are first received in their respective central apertures 127 and
128 of intermediate frame 120/120'. Preferably, diaphragms 121 and
122 are over-moulded or co-moulded onto intermediate frame 120,
either immediately after intermediate frame 120 is formed in the
injection moulding tool, or in a later, separate moulding step.
Intermediate frame 120 is then attached to lower case 130 such that
diaphragm 121 caps liquid outlet 131 in lower case 130, and such
that outer projecting wall 126 of intermediate frame 120 is
received in a corresponding groove along the perimeter of lower
case 130.
[0171] When attaching intermediate frame 120/120' to lower frame
130, notched aperture 129' points away from lower case 130. Upper
case 110 is then attached to lower case 130 by engaging a groove
along its perimeter with corresponding outer projecting wall 126 of
intermediate frame 120. Notch 129 is received in notched aperture
129'. The preferred method of attachment between intermediate frame
120, lower case 130 and the upper case 110 is ultrasonic welding,
but other methods could be employed, e.g. using adhesives, so long
as they create a seal around each valve compartment.
[0172] As described above, intermediate frame 120 (or intermediate
frame 120') may be made from two-part silicone. In particular,
relatively rigid frame portion 123 of intermediate frame 120 may be
made from hard grade silicone, whilst diaphragms 121 and 122 may be
made relatively soft grade silicone. An advantage of this
arrangement is that the relatively hard silicone of rigid frame
portion 123 is generally not as hard as typical plastics, and so
retains a small degree of compressibility. Hence, the assembly of
valve assembly 100 may be simplified such that only upper case 110
need be welded to lower case 130, without requiring the step of
welding intermediate frame 120 to lower case 130 or upper case 110.
Instead, the sealing around each valve compartment may rely on
compression of rigid frame portion 123 by upper and lower cases 110
and 130. The compression may be held by, for example, an ultrasonic
weld around the perimeter of lower and upper cases 110 and 130,
although other means could be used, e.g. using adhesives.
[0173] Once assembled, the structure and function of assembly 100
are largely identical as those of assembly 10. For example, an
angled channel or bent conduit may lead from the outside of
assembly 100 to liquid outlet 131, so as to minimise direct
pressure from moving water, e.g. as generated by a child shaking
the cup.
[0174] Once assembled, assembly 100 can be fitted to the underside
of a cup lid, with air inlet tube 133 and liquid outlet tube 134
plugging respectively into air inlet 112 and valve outlet 111, as
seen in FIG. 11. To ensure effective sealing, diaphragms 121 and
122 are located such that liquid outlet 131 and air inlet 121 press
on the underside of their respective diaphragms 121 and 122,
slightly stretching and deforming them.
[0175] Alternative embodiments to assembly 100 are shown in FIGS.
12a-12c. In these embodiments, the valve assembly incorporates the
foldability aspect described in connection with assembly 10. In
FIGS. 12a and 12b, upper and lower cases 210 and 230 are moulded as
a single, hinged piece. Intermediate frame 220 (with diaphragms 221
and 222) is then attached to lower case 230, as described above in
relation to FIGS. 10a-10d. Upper case 210 is then folded over and
attached to both lower case 230 and intermediate frame 220.
[0176] As seen in FIG. 10c, in an alternative embodiment valve
assembly 200 may also be moulded as a single part. Upper case 210
and lower case 230 are hingedly connected to and located on
respective sides of intermediate frame 220. To assemble valve
assembly 200, intermediate frame 220 is folded over (with upper
case 210) to locate into lower case 230. Intermediate frame 220 is
then attached to lower case 230 (e.g. by sonic welding) before
upper case 210 is folded over onto lower case 230 and intermediate
frame 220, and attached to both.
[0177] In the above embodiments, the upper/lower cases and
intermediate frame may be attached/folded over in different
sequences, and the above-described sequences of assembly steps are
merely exemplary and should not be construed as limiting.
[0178] The above embodiments describe a valve assembly that may be
used for example with an infant drinking cup so as to prevent
spillages. However, the valve concept may in addition be applied to
baby bottles or similar such drinking cups or vessels. In particle,
the valve assembly may therefore be used to vent a baby bottle when
suction is applied to the bottle's teat by the infant. To be used
with a baby bottle, the assembly may be simplified such that only
an air valve need be provided--in other words the liquid valve
portion of the valve assembly may be dispensed with.
[0179] FIGS. 13a-17b illustrate various embodiments in which the
valve assembly of the present invention is incorporated into a baby
bottle, in particular at the base of the bottle, to provide venting
capability. As the infant draws liquid out of the bottle through
suction at the bottle's teat, air may be automatically allowed to
enter into the bottle at the base, via the valve assembly, to
equalise the pressure and facilitate suction of the liquid out of
the bottle.
[0180] FIGS. 13a and 13b illustrate an open system wherein the
liquid product is allowed to flow around the valve, but is baffled
from any shocks to avoid leaks. Inner 1310 is a twin shot component
that uses a relatively soft diaphragm 1320 and bottle seal 1330. To
assemble the parts, inner 1310 is pushed into base 1340 of bottle
1350. Base 1340 is then screwed or otherwise attached to bottle
1350. A relatively thicker section of soft material between inner
1310 and base 1340 enables greater tolerance of the final base
position whilst maintaining the desired diaphragm interference.
[0181] The operation of the valve is similar to that described
above in connection with valve assemblies 10, 100 and 200, with
diaphragm 1320 lifting off first fluid inlet 1321 (the central
spigot) when suction is applied to bottle 1350. Air may then flow
into bottle 1350 through second fluid inlet 1322 and apertures
1323.
[0182] FIGS. 13c-13g illustrate a variant of the embodiment of
FIGS. 13a and 13b. FIG. 13c shows a closed system with a twin shot
inner component 1360 shown in more detail in FIG. 13f. On the
underside of inner component 1360 is a barrier seal 1362 arranged
to sealingly engage base 1370 (seen more clearly in FIGS. 13c and
13d). Inner component 1360 comprises a diaphragm 1364, with
apertures 1366 disposed adjacent the periphery of diaphragm 1364
and formed within inner component 1360. Base 1370 comprises air
inlet 1372. When compared to the embodiment of FIGS. 13a and 13b,
the redundant space between inner component 1360 and base 1370 is
reduced. In addition, barrier seal 1362 serves to insulate air
inlet 1372 from the milk or other contents of the bottle.
[0183] The operation of the valve is similar to that described
above in connection with valve assemblies 10, 100 and 200, with
diaphragm 1364 lifting off air inlet 1372 when suction is applied
to the feeding bottle. Air may then flow into the bottle through
air inlet 1372, pushing open barrier seal 1362, and subsequently
passing through apertures 1366.
[0184] In FIGS. 14a and 14b, the valve comprises a two-part valve
with a twin shot inner component 1410 that is spin welded onto
bottle 1420, with base 1430 being able to screw on and off inner
1410. The flexible diaphragm comprises an outer portion 1450 with
apertures 1480 formed therein, and a central portion 1440. Outer
portion 1450 and central portion 1440 are separated by a ring 1460
(or diaphragm frame) of rigid material that is formed as part of
the twin shot.
[0185] As base 1430 is screwed onto inner 1410, diaphragm frame
1460 is pushed up by central spigot 1470 allowing for a greater
base assembly tolerance. The distance between diaphragm frame 1460
and central spigot 1470 is a controlled dimension. In other words,
as base 1430 is screwed further onto inner 1410, the tension in
outer portion 1450 of the flexible diaphragm will increase, whilst
the tension in central portion 1440 will remain substantially
constant due in part to diaphragm frame 1460 which isolates the
central portion 1440 from upward movement of the push ring
1465.
[0186] The operation of the valve is similar to that described
above in connection with valve assemblies 10, 100 and 200, with
central portion 1440 lifting off the fluid inlet in central spigot
1470 when suction is applied to bottle 1420. Air may then flow into
bottle 1420 through apertures 1480. Apertures 1480 may be slits or
very small holes or similar in outer portion 1450 of the flexible
diaphragm that substantially prevent liquid from within bottle 1420
from entering into base 1430.
[0187] FIGS. 15a and 15b illustrate a further alternative
embodiment of the air valve assembly. The valve uses two
components: a twin shot base valve and base cover 1520. To assemble
the parts, base cover 1520 is rotated to a lock position on the
bottom of base 1530 and the assembled base is screwed onto bottle
1540. Base 1530 could also be spin welded onto bottle 1540, leaving
only base cover 1520 to remove for cleaning. As base cover 1520 is
locked into position, a push ring 1550 engages with diaphragm frame
1560 as described above in relation to the valve assembly of FIGS.
14a and 14b. Thus, the distance and relative heights from push ring
1550 to fluid inlet 1570 (e.g. the central spigot) is a controlled
dimension. In other words, as base cover 1520 is screwed further
onto base 1530, the tension in the outer portion of the flexible
diaphragm will increase, whilst the tension in the central portion
(within diaphragm frame 1560) will remain substantially
constant.
[0188] The operation of the valve is similar to that described
above in connection with valve assemblies 10, 100 and 200, with the
diaphragm lifting off the fluid inlet 1570 when suction is applied
to bottle 1540. Air may then flow into bottle 1540 through fluid
inlet 1580 and through apertures 1590 in the outer portion of the
diaphragm. Apertures 1590 may be slits or very small holes or
similar as per apertures 1480 described above.
[0189] FIGS. 15c-15g illustrate a variant of the embodiment of
FIGS. 15a and 15b. The valve comprises a twin shot base 1591 and a
removable base cover or insert 1592 including an air inlet 1593.
Base 1591 includes an umbrella flap 1594 or similar valve member
(as can be more clearly seen in FIGS. 15c and 15d) for creating a
secondary seal to reduce open headspace in the valve. Umbrella flap
1594 also serves to keep liquid away from air inlet 1593. Base 1591
may be either screwed onto the bottle for ease of
assembly/cleaning, or spin welded to reduce complexity. Base 1591
further comprises diaphragm 1595 and apertures 1596 disposed
adjacent the periphery of diaphragm 1595 and formed within base
1591. Base cover 1592 includes a gripping member to assist in
screwing base cover 1592 into base 1591. The operation of the valve
is similar to that described above in connection with valve
assemblies 10, 100 and 200, with diaphragm 1595 lifting off air
inlet 1593 when suction is applied to the feeding bottle. Air may
then flow into the bottle through air inlet 1593, pushing open
umbrella flap 1594, and subsequently passing through apertures
1596.
[0190] In FIGS. 16a and 16b, the valve comprises base 1610 and twin
shot valve insert 1620. Valve insert 1620 is pressed into base 1610
which is then screwed onto bottle 1630. Valve insert 1620 can be
removed with finger and thumb. Unlike the valve of FIGS. 13a and
13b, the valve is a closed system in which the liquid is kept away
from the valve by flap 1680 that runs around valve insert 1620.
Flap 1680 therefore serves to keep the liquid out of the cavity
1640 in base 1610. An inner seal allows diaphragm 1650 to operate
with lower forces. The valve assembly uses a similar diaphragm
frame to FIGS. 14a, 14b, 15a and 15b, engaging with a push ring on
base 1610 to control the tension in the central portion of the
diaphragm during screwing of base 1610 onto bottle 1630.
[0191] The operation of the valve is similar to that described
above in connection with valve assemblies 10, 100 and 200, with the
central portion of diaphragm 1650 lifting off the fluid inlet 1660
(e.g. the central spigot) when suction is applied to bottle 1630.
Air may then flow into bottle 1630 through fluid inlet 1670 and
flap 1680.
[0192] FIGS. 16c-16g illustrate a variant of the embodiment of
FIGS. 16a and 16b. FIG. 16c shows a closed system with a twin shot
insert 1690 shown in more detail in FIG. 16f. On the underside of
inner component 1690 is a barrier seal 1691 arranged to sealingly
engage base 1692 (seen more clearly in FIGS. 16c and 16d). Insert
1690 comprises a diaphragm 1693, with apertures 1694 disposed
adjacent the periphery of diaphragm 1693 and formed within insert
1690. Air inlet 1695 is seen in the underside of base 1692. Insert
1690 is large enough to seal the opening in the base of the feeding
bottle.
[0193] The operation of the valve is similar to that described
above in connection with valve assemblies 10, 100 and 200, with
diaphragm 1693 lifting off air inlet 1695 when suction is applied
to the feeding bottle. Air may then flow into the bottle through
air inlet 1695, pushing open barrier seal 1691, and subsequently
passing through apertures 1694.
[0194] FIGS. 17a and 17b illustrate a further alternative
embodiment of the air valve assembly in which a larger silicone
diaphragm 1710 is used to keep the liquid out of the valve area and
to provide a bottle/base seal. Central diaphragm 1710 works in the
same way as the cartridge-type systems described above in relation
to FIGS. 13a-16b, but the larger size of diaphragm 1710 makes it
easier to open under suction. To maintain its shape, central
diaphragm 1710 is circled by a thicker section 1720 of silicone or
other similar material. Beyond this are a series of apertures 1730
that allow air into bottle 1740 from the lower chamber whilst
sealing against base 1750 to keep the liquid away from the valve.
To assemble bottle 1740, silicone diaphragm 1710 is pressed into
base 1750 which is then screwed onto bottle 1740 sealing against
the silicone, holding it in place.
[0195] The operation of the valve is similar to that described
above in connection with valve assemblies 10, 100 and 200, with
diaphragm 1710 lifting off first fluid inlet 1780 (the central
spigot) when suction is applied to bottle 1740. Air may then flow
into bottle 1740 through second fluid inlet 1790 and apertures
1730.
[0196] FIGS. 17c and 17d illustrate a variant of the embodiment of
FIGS. 16c-16g. Like features are therefore referenced using like
reference numbers. The operation of the valve is similar to that
described above in connection with valve assemblies 10, 100 and
200, with diaphragm 1793 lifting off air inlet 1795 when suction is
applied to the feeding bottle. Air may then flow into the bottle
through air inlet 1795 and subsequently apertures 1796.
[0197] Further examples of valve assemblies in accordance with the
present invention are shown in FIGS. 18a-21b.
[0198] FIGS. 18a and 18b show a two-part valve 1800 using
convoluted paths 1810 and 1820 to control the air intake and fluid
flow. Rigid retaining plate 1830 pushes the elastomer mouthpiece
1840 through the top of the lid 1860 so they can be clamped
together when the bottle is shut. Flap valves (such as flap valve
1850) in the elastomer act against retaining plate 1830, and open
(as shown in FIG. 18b) when negative pressure is applied, allowing
fluid around convoluted path 1810. Air returns along convoluted
path 1820. The multiple U-bends of convoluted paths 1810 and 1820
prevent fluid from easily leaking out of mouthpiece 1840.
[0199] FIGS. 19a and 19b show a two-part valve 1900 using a
flexible elastomer tube 1920 and a bi-injected retaining tube 1910.
In its natural state (FIG. 19a), inner tube 1920 blocks the
apertures 1930 in retaining tube 1910. When negative pressure is
applied to mouthpiece 1940 (FIG. 19b), inner tube 1920 deforms,
allowing fluid to pass through apertures 1930 and 1950. Retaining
tube 1910 may also be attached to and integral with the air-intake
valve 1960.
[0200] FIGS. 19c and 19d show a modified embodiment of valve 1900.
Like features are identified using like reference numbers. In
particular the valve now includes a bump or other protuberance 1970
to better seal against the hole 1950 in the flexible valve.
[0201] FIGS. 20a and 20b show a single-part valve 2000 whereby the
valving operation is moved into a removable mouthpiece 2010.
Mouthpiece 2010 is securely held in place in the cap 2020 but can
be removed for cleaning. When the valve is open (as in FIG. 20b),
fluid flows out of mouthpiece 2010 through an integral slit valve
2030 and air returns via an integral flap-style valve 2040 formed
by mouthpiece 2010.
[0202] FIGS. 21a and 21b show a single-part valve 2100 that uses a
rigid ring 2110 which folds and clips into a retaining plate 2120
around the mouthpiece 2130. A thin-walled elastomer 2150 forms the
valve allowing fluid to flow to mouthpiece 2130 when negative
pressure is applied (FIG. 21b). Instead of the elastomer 2150 shown
in FIGS. 21a and 21b, collapsible bellows could be used instead. An
easy-grip handle 2140 is formed on the bottom of retaining plate
2120 to assist removal. More details of rigid ring 2110 and
retaining plate 2120 are shown in FIGS. 21c-21e, showing how ring
2110 fits into retaining plate 2120.
[0203] Whilst the invention has been described in connection with
preferred embodiments, it is to be understood that the invention is
not limited to these embodiments, and that alterations,
modifications, and variations of these embodiments may be carried
out by the skilled person without departing from the scope of the
invention.
* * * * *