U.S. patent application number 09/759894 was filed with the patent office on 2002-07-18 for remotely located liquid dispensing valve.
Invention is credited to Bowman, Ronald L..
Application Number | 20020092877 09/759894 |
Document ID | / |
Family ID | 25057356 |
Filed Date | 2002-07-18 |
United States Patent
Application |
20020092877 |
Kind Code |
A1 |
Bowman, Ronald L. |
July 18, 2002 |
Remotely located liquid dispensing valve
Abstract
A flexible member is fabricated with side walls forming a
chamber which is coupled to a liquid source on one side and has a
slit through an end wall on the other side. The end wall is
generally curved toward the chamber on its interior surface. The
exterior surface of the end wall has ridges adjacent to the slit
that extends through the end wall. Deformation of the side walls of
the flexible member as by biting causes the end wall with the slit
to deform and open the slit which otherwise is retained closed by
the walls of the flexible member. This action establishes fluid
dispensing from the source through the slit. The thickness of the
end wall varies over its distance creating weaken areas in the end
wall. These weakened areas create areas in which the end wall
deforms opening the slit. In addition to the foregoing, the
interior surface forming the chamber has a minimal surface area.
The surface is smooth, allowing easier cleaning of the chamber.
Inventors: |
Bowman, Ronald L.; (Golden,
CO) |
Correspondence
Address: |
Ronald L. Bowman
11957 Brook Road
Golden
CO
80403-8581
US
|
Family ID: |
25057356 |
Appl. No.: |
09/759894 |
Filed: |
January 16, 2001 |
Current U.S.
Class: |
222/490 ;
220/714; 222/175; 251/342 |
Current CPC
Class: |
A45F 3/18 20130101; B65D
47/2031 20130101 |
Class at
Publication: |
222/490 ;
222/175; 220/714; 251/342 |
International
Class: |
B65D 035/38 |
Claims
1. A liquid dispensing valve for positioning in the mouth of an
individual for selectively delivering liquid from a liquid
container comprising: a unitary body portion sized to comfortably
fit in the mouth of a user and being constructed of a flexible
resilient material with an inlet side of said unitary body for
establishing fluidic communication with a fluid supply tube, an
internal cavity formed by side wall members, a top wall member
opposite of said inlet side enclosing said side wall members; said
top wall member having an inner surface facing said cavity and
outer surface and a normally closed slit extending through said top
wall member with said through slit opening upon pressure being
applied to an opposing pair of said side wall members thereby
establishing a fluid flow line through said cavity; said outer
surface of said top wall member includes a plurality of
discontinuity.
2. A liquid dispensing valve in accordance with claim 1 wherein
said inner surface of said top wall member being curved inward
toward said cavity.
3. A liquid dispensing valve in accordance with claim 1 wherein
said side wall members having an interior surface and exterior
surface; said exterior surface being planar.
4. A liquid dispensing valve in accordance with claim 3 wherein
said interior surface of said side wall member being continuous and
absent of interruptions.
5. A liquid dispensing valve for positioning in the mouth of an
individual for selectively delivering liquid from a liquid
container comprising: a unitary body portion sized to comfortably
fit in the mouth of a user and being constructed of a flexible
resilient material with an inlet side of said unitary body for
establishing fluidic communication with a fluid supply tube, an
internal cavity formed by side wall members, a top wall member
opposite of said inlet side enclosing said wall members; said top
wall member having an inner surface facing said cavity and outer
surface and a normally closed slit extending through said top wall
member with said through slit opening upon pressure being applied
to an opposing pair of said side wall members thereby establishing
a fluid flow line through said cavity; said outer surface of said
top wall member having ridges adjacent to said through slit, in
which said ridges extend against each other to close said slit and
prevent outside air from entering said cavity.
6. A liquid dispensing valve in accordance with claim 5 wherein
said inner surface of said top wall member being curved inward
toward said cavity.
7. A liquid dispensing valve in accordance with claim 5 wherein
said side wall members having an interior surface and exterior
surface; said exterior surface being planar.
8. A liquid dispensing valve in accordance with claim 7 wherein
said interior surface of said side wall member being continuous and
absent of interruptions.
9. A liquid dispensing valve for positioning in the mouth of an
individual for selectively delivering liquid from a liquid
container comprising: a unitary body portion sized to comfortably
fit in the mouth of a user and being constructed of a flexible
resilient material with an inlet side of said unitary body for
establishing fluidic communication with a fluid supply tube, an
internal cavity formed by side wall members, a top wall member
opposite of said inlet side enclosing said wall members; said top
wall member having an inner surface facing said cavity and outer
surface and a normally closed slit extending through said top wall
member with said through slit opening upon pressure being applied
to an opposing pair of said side wall members thereby establishing
a fluid flow line through said cavity; said side wall members
having an interior and exterior surface; said side wall members
having a plurality of discontinuity on said external surface; said
plurality of discontinuity creates weakened areas in said side wall
members, and are oriented in the direction of fluid flow through
said liquid dispensing valve.
10. A liquid dispensing valve in accordance with claim 9 wherein
said inner surface of said top wall member being curved inward
toward said cavity.
11. A liquid dispensing valve in accordance with claim 9 wherein
said exterior surface of said side wall members being planar.
12. A liquid dispensing valve in accordance with claim 9 wherein
said exterior surface of said top wall member having ridges, in
which said ridges extend against each other sealing the said slit
preventing air from entering said cavity.
13. A liquid dispensing valve in accordance with claim 9 wherein
said interior surface of said side wall member being continuous and
absent of interruptions.
14. A liquid dispensing valve for positioning in the mouth of an
individual for selectively delivering liquid from a liquid
container comprising: a unitary body portion sized to comfortably
fit in the mouth of a user and being constructed of a flexible
resilient material with an inlet side of said unitary body for
establishing fluidic communication with a fluid supply tube, an
internal cavity formed by side wall members, a top wall member
opposite of said inlet side enclosing said wall members; said top
wall member having an inner surface facing said cavity and outer
surface and a normally closed slit extending through said top wall
member with said through slit opening upon pressure being applied
to an opposing pair of said side wall members thereby establishing
a fluid flow line through said cavity; said side wall members
having an interior and exterior surface; said side wall members
having ridges on said exterior surface; said ridges create
strengthen areas in said side wall members, and are generally
oriented in the direction of fluid flow through said liquid
dispensing valve.
15. A liquid dispensing valve in accordance with claim 14 wherein
said inner surface of said top wall member being curved inward
toward said cavity.
16. A liquid dispensing valve in accordance with claim 14 wherein
said exterior surface of said side wall members being planar.
17. A liquid dispensing valve in accordance with claim 14 wherein
said exterior surface of said top wall member having ridges, in
which said ridges extend against each other sealing the said slit
preventing air from entering said cavity.
18. A liquid dispensing valve in accordance with claim 14 wherein
said interior surface of said side wall members being continuous
and absent of interruptions.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of Invention
[0002] The present invention relates to the field of liquid
replenishing hydration systems. In particular the present invention
relates to a liquid dispensing valve of a hydration system that
improves performance in sustaining a column of liquid and improved
liquid delivery flow and is easily cleaned and sanitized.
[0003] 2. Discussion of Relevant Art
[0004] Hydration systems are used to supply liquid and re-hydrate a
person that is generally losing body moisture as a result of heavy
physical exertion, heat or a combination of the two. Hydration
systems are generally constructed to hold water or a water based
drink in either a rigid or flexible container. A rigid container
generally denotes a plastic bottle or canteen while a flexible
container generally denotes a bota bag or bladder type system. A
rigid container is generally transported in lumbar packs worn
around the waist or backpacks and the flexible container is
generally transported in a small backpack situated high on the back
between the shoulder blades. In both systems the container may be
connected to a flexible tube and at the opposite end of the tube, a
liquid dispensing valve is secured. Since the liquid dispensing
valve is remotely connected to a liquid reservoir the user can
hydrate their body without stopping an activity. The liquid
dispensing valve is generally opened with a biting action and fluid
is removed by a sucking action on the liquid dispensing valve while
it is open. Once the biting pressure is discontinued the opening
closes stopping fluid flow. If a liquid reservoir is transported or
located at an elevation lower than the liquid dispensing valve a
negative static head is created in the liquid dispensing valve.
This negative pressure attempts to equalize the liquid draining it
from the liquid dispensing valve back into the reservoir. If a
liquid reservoir is transported or located at an elevation higher
than the liquid dispensing valve a positive static head is created
in the liquid dispensing valve. This positive pressure also
attempts to equalize the liquid wanting to drain the liquid
reservoir into the liquid dispensing valve. If the liquid
dispensing valve is unable to hold a sufficient negative static
head, liquid will drain from the liquid dispensing valve and tube
back to the liquid reservoir. If the liquid dispensing valve is
unable to hold a sufficient positive static head, liquid will drain
through the liquid dispensing valve eventually emptying the liquid
reservoir.
[0005] U.S. Pat. Nos. 5,085,349, 5,730,336, 5,816,457, 6,070,767
and 6,032,831 describe a liquid dispensing valve that is connected
to a liquid reservoir. U.S. Pat. No. 5,085,349 describes a liquid
dispensing valve with a positive static flow to the fluid
dispensing unit with the capability of maintaining an eight feet
positive column of liquid with a 0.350 inch material thickness at
the through slit area. U.S. Pat. No. 5,730,336 describes a liquid
dispensing valve that is designed to resist distortion by positive
pressure from within the container and intentionally deforms and
opens under negative pressure within the container. U.S. Pat. No.
5,816,457 describes a liquid dispensing valve that is designed to
maintain a seal under positive pressure within the container but
the design is inherent to fail with a negative pressure in the
container.
[0006] In U.S. Pat. No. 5,791,510 FIG. 1. shows a partial diagram
of a cyclist with a liquid container at or below the liquid
dispensing valve. In actual use this liquid dispensing valve must
incorporated an inline check valve to hold the liquid at the level
of the liquid dispensing valve due to the liquid dispensing valve
cannot accomplish this task separately. The check valve and liquid
dispensing valve are sold through a company named Check Water
located in California.
[0007] U.S. Pat. Nos. 5,730,336 and 5,791,510 are made of a
relatively thin uniform elastic or pliable material. In conjunction
with the resiliency of the material both patents teach of an
additional member to act as a spring to help force the through slit
in a closed position. U.S. Pat. No. 5,085,349 is made of a elastic
or pliable material with varying wall thickness. In conjunction
with the resiliency of the material it also relies on a pressure
angle that increases the seal but also increases material thickness
at the through slit area and decreases flow through the valve. The
material thickness at the through slit may be as thick as the
pressure angle will allow creating a liquid dispensing valve that
is to rigid to comfortably open with the mouth by a biting action.
The aforementioned U.S. patents show art to liquid dispensing
valves that will maintain a positive static head but no prior art
shows a liquid dispensing valve capable of maintaining a negative
static head in a personal hydration system.
[0008] U.S. Pat. Nos. 5,085,349, 6,070,767 and 6,032,831 show the
outer and inner surface of the through slit wall flexing outward
when a biting action is applied. As previously mentioned this
biting action is used to open the valve in order to draw liquid
from a reservoir. In U.S. Pat. Nos. 6,032,831 and 6,070,767 a
drawing designated as FIG. 8. Shows the dispensing face of a liquid
dispensing valve being forced outward into the user's mouth as the
through slit opens. This outward flexing of the through slit wall
increases the overall length of the bite valve portion inserted
into the user's mouth often touching the tongue during use. This
incident will interfere and hamper the flow of water through the
liquid dispensing valve. Also, in FIG. 8. through slit wall,
designated as number 50, shows a tremendous amount of external
exposure to the sealing surface (50) when the dispensing face is
forced into an open position. This external exposure allows dirt,
sand and foreign particles to adhere to the sealing surface (50)
hindering the seal of the liquid dispensing valve in a relaxed
state. It is preferred that the liquid dispensing face of a liquid
dispensing valve flex inward away from the tongue during operation,
insuring unrestricted water flow. It is also preferred that a
liquid dispensing face flex inward protecting the through slit wall
from external contamination insuring a reliable seal.
[0009] Liquid dispensing valves are also difficult to clean and
sanitize especially the interior cavity formed by the side walls
and liquid dispensing wall. Many liquid dispensing valves are
difficult to remove from the flexible tube, and after removal,
difficult to thoroughly clean. The surfaces of the interior cavity
will accumulate bacteria, germs and dirt in general, which is
common in this application. The more intricate the inner surfaces
facing the cavity, the more difficult is it to thoroughly clean the
interior cavity and the liquid dispensing valve. The accumulation
of bacteria, germs and dirt in a liquid dispensing valve presents a
heath hazard. Current methods of cleaning a liquid reservoir,
flexible tubes and liquid dispensing valve are laborious and
ineffective if not performed correctly and continuously.
[0010] U.S. Pat. Nos. 5,085,349, 5,730,336, 6,070,767, 5,816,457
and 6,032,831 show liquid dispensing valves that contain interior
cavities with multiple angles, curves, small surfaces, undercuts
and areas that are difficult to access. These areas and surfaces
are extremely difficult to clean and sanitize especially when the
inlet opening of these valves are small, making it difficult to
insert proper cleaning utensils. Two methods currently exist for
proper cleaning liquid dispensing valves. The first method is a
mechanical removal of interior contaminants with a brush. This
requires special brushes such as CamelBaks multiple brush cleaning
kit. Often these cleaning utensils are not purchased or available
for a particular liquid dispensing valve. The second method is a
chemical cleaning agent. These agents are effective in sanitizing
the liquid dispensing valve but great care must be taken to
thoroughly rinse the chemical completely from the liquid dispensing
valve. A mechanical removal of build up contaminants is often
necessary in conjunction with a chemical cleansing agent. Many
times the end user is simply unaware of the steps necessary to
properly clean their liquid dispensing valve. All liquid dispensing
valves need to be cleaned but a valve that has a minimum of complex
surfaces, angles and inaccessible areas in the interior cavity is
much easier to clean and less likely to accumulate contaminants. It
is preferred that a liquid dispensing valve is easily removed and
easily cleaned on all surfaces with minimal effort.
[0011] Based on the above and other problems with the relevant art,
it is the object of the present invention to create a liquid
dispensing valve that will flex inward and maintain liquid in the
valve being subjected to either a high positive static or a high
negative static head.
[0012] Another objective of the present invention is to create a
liquid dispensing valve that has a relatively thin wall at the area
of the through slit for improved fluid flow and is an assembly
without the need of an additional spring-like member.
[0013] Another objective of the present invention is to create a
liquid dispensing valve that has a minimum interior cavity surface
shape to minimize accumulation of contaminants making cleaning
easier and in less intervals. This can be accomplished by a liquid
dispensing valve constructed of elastic or pliable material using
the mechanics of properly located external hinge points for
calculated movement and stress of material.
SUMMARY OF INVENTION
[0014] The above discussed and other problems with the relevant art
are overcome by the liquid dispensing valve of the present
invention. The present invention comprises a liquid dispensing
valve that is constructed of elastic or a pliable polymer that
remains flexible over a wide temperature range. The present
inventions is generally attached to a flexible tube which, in turn,
is attached to a reservoir that generally holds water or a water
based drink. As the liquid dispensing valve is deformed by a biting
action and outside negative pressure is created by a sucking action
on the liquid dispensing valve, liquid is drawn from a reservoir
through a tube and through a deformed slit of the liquid dispensing
valve. After the user has received a sufficient quantity of liquid
he discontinues exerting a sucking pressure and biting action to
the liquid dispensing valve. The liquid dispensing valve returns to
a neutral state forcing the through slit to close stopping fluid
movement. It is preferred that liquid remain in the tube and the
liquid dispensing valve to avoid a delay in obtaining liquid and
additional effort required to draw liquid through the tube again. A
delay in liquid delivery is frustrating to a user as he attempt to
re-hydrate during a strenuous activity. It is also preferred that
the liquid dispensing valve does not leak which would empty the
container denying the user necessary hydration.
[0015] If the liquid reservoir is located at a significantly lower
elevation than the liquid dispensing valve the fluid will have a
propensity to drain back into the container. For this to happen the
through slit of the liquid dispensing valve must momentarily loose
its seal allowing air to enter the slit and occupy the area vacated
by the draining fluid. If the through slit seal remains intact the
fluid will maintain its position in the tube and liquid dispensing
valve and the pressure in the liquid dispensing valve will be less
than in the reservoir. The present invention utilizes hinge lines
to the through slit on the outer surface of the outlet side of the
liquid dispensing valve to effectively increase the seal during
this situation. The hinge lines are parallel to the through slit
and a hinge line exists equal distance on each side of the through
slit. This enables the pliable material to flex and swing about the
through slit to the hinge line, similar to two cabinet doors that
open from the center and minimize the gap between when closed. To
aid in the controlled manner in which the through slit is forced
open the outer surface of the outlet end may be scalloped on both
sides transverse of the through slit between the hinge lines. This
scalloped detail is an area where material has been removed from
the outer surface forming a weakened line through the outer
surface. As the liquid dispensing valve is compressed by biting,
the outer surface flexes inward. The scalloped areas provide an
external void in the liquid dispensing face for material to
compress and fold onto itself and lessen the biting force required
to open the through slit.
[0016] If the reservoir is located at a significantly higher
elevation than the liquid dispensing valve the liquid will increase
pressure in the liquid dispensing valve. This is due to the fluid
equalizing to the lowest level. At this time the pressure in the
liquid dispensing valve is greater than the liquid reservoir. To
contain this increase in pressure the present invention has a
curved surface on the inner wall of the dispensing face of the
liquid dispensing valve. The curve is directed toward the inner
chamber of the liquid dispensing valve. The seal of the through
slit of the inner curved surface increases as a curved surface
inherently resists distortion and the minimal distortion
encountered forces the curved surface to increase the seal, much
like a keystone is the focal point of pressure in an arched
structure. The liquid dispensing valve may be rectangle-like when
viewed from a transverse cross section. The opposing side walls
constructed parallel to the hinge lines have a substantial wall
thickness. This wall thickness forms a foundation for the liquid
dispensing valve and will flex less than remaining wall structures
of this device.
[0017] These opposing walls form a strong support for the
attachment of the inner curved surface of the outlet dispensing
wall member and strong support for the parallel hinge line to the
through slit on the outer surface of the outlet dispensing wall
side. These walls, being straight or nearly straight, exert a force
opposite of the biting action required to open the through slit and
return the slit to a closed position when the biting action is
removed. Parallel to the length of these walls may be voids located
about midway in the exterior surface. The void act as hinge line
along the length of the wall enabling the wall flex with less
effort. The adjacent opposing side walls are of substantially less
thickness than the previously mentioned walls. These opposing walls
are the thinnest of the wall structure including the wall structure
that forms the outlet side of the liquid dispensing unit. The
thinner construction of these walls causes them to flex before all
other walls encountering same pressure. Under a positive static
head of pressure these walls will flex outward effectively creating
a greater seal to the through slit. Under a negative static head of
pressure these walls will flex inward effectively creating a
greater seal to the through slit.
[0018] Surfaces forming the interior cavity of the present
invention are large smooth curved surfaces with minimal
projections, comers or angles. This creates an uninterrupted
interior cavity that is easy to clean and has less of a propensity
to accumulate contaminants. The present invention locates flex
points, comers, projections and smaller interrupted surfaces on the
outer surface of the liquid dispensing valve. The outer surface of
a liquid dispensing valve is much easier to clean and maintain so
the addition of such flex points, comers and projections does not
hinder performance or ability of the present invention to be
cleaned.
[0019] The liquid dispensing valve attaches to a flexible tube on
the inlet side of the valve. Two methods are used; one provides a
unitary liquid dispensing valve with an annular opening at the
inlet side of the liquid dispensing valve being smaller in
dimension than the outer diameter of the joining annular tube. The
pliability of material of the liquid dispensing valve allows the
inlet side of the device to be stretched and placed over the outer
surface of the tube. Friction between the outer surface of the tube
and inlet side of the present invention maintains the position of
the liquid dispensing valve to the tube.
[0020] The other method of attachment to the flexible tube consists
of an intermediate structure which attaches to the second end of
the flexible tube at one portion and at a second portion attaches
to the liquid dispensing valve of the present invention. This
structure allows continuity of liquid from a liquid reservoir to
the liquid dispensing valve. The liquid dispensing valve must be
stretched and deformed at the inlet side to be place over the
second portion of the intermediate structure engaging mating seals.
The liquid dispensing valve must have a larger inlet side to engage
the intermediate structure than the previously mentioned friction
fit method. The larger inlet opening allows the interior cavity of
the liquid dispensing valve to be readily exposed when the valve is
removed. The larger inlet opening makes cleaning of the interior
surfaces much easier.
BRIEF DESCRIPTION OF DRAWINGS
[0021] The accompany drawing, which constitute a part of the
specifications, illustrate a preferred embodiment of the invention
and together with the general description and the detailed
description serve to explain the principles of the invention.
[0022] FIG. 1 shows a general overview of a flexible reservoir as
it pertains to a hydration system. The liquid dispensing valve of
this illustration is positioned at an elevation lower than liquid
in the reservoir with +X denoting a positive static head in the
liquid dispensing valve.
[0023] FIG. 2 shows a general overview of a rigid reservoir as it
pertains to a hydration system. The liquid dispensing valve of this
illustration is positioned at an elevation higher than liquid in
the reservoir with -XX denoting a negative static head in the
liquid dispensing valve.
[0024] FIG. 3 shows a view of the liquid dispensing valve of the
present invention.
[0025] FIG. 4 shows a view of an alternate embodiment of the
present invention of FIG. 3.
[0026] FIG. 5 shows a view of an alternate embodiment of the
present invention of FIG. 3 with an intermediate mounting structure
between the present invention and the secondary end of the flexible
tube.
[0027] FIG. 6 shows a cross section view of FIG. 3 as shown by a
through line and arrows denoted as 6-6. This view also shows the
movement and sealing of the through slit in the end wall as the
liquid dispensing valve is placed under internal positive static
pressure.
[0028] FIG. 7 shows a view of FIG. 6 with movement and sealing of
the through slit in the end wall as the liquid dispensing valve
placed under internal negative static pressure.
[0029] FIG. 8 shows an alternate embodiment of the present
invention as viewed in FIG. 6. The outer surface of the liquid
dispensing wall is serrated.
[0030] FIG. 9 shows a view of FIG. 3 as shown by a view line and
arrows denoted as 9-9.
[0031] FIG. 10 shows an alternate embodiment of FIG. 9 with voids
located on the outer angled flat wall surface and projections on
opposing wall members.
[0032] FIG. 11 shows an alternate embodiment to FIG. 9 with voids
as described in FIG. 10 and wall members being curved.
[0033] FIG. 12 shows the preferred embodiment of the present
invention of FIG. 3 under a compressed biting force, as denoted by
arrows, showing the liquid dispensing valve compressing opening the
through slot.
[0034] FIG. 13 shows a cross section view of FIG. 12 as shown by a
though line and arrows denoted as 13-13.
[0035] FIG. 14 shows a cross section view of FIG. 12 as shown by a
through line and arrows denoted as 14-14.
[0036] FIG. 15 shows an alternate embodiment to FIG. 12 with a void
extending along external wall surface forming a flex line.
[0037] FIG. 16 shows a cross section view of FIG. 15 as shown by a
through line and arrows denoted as 16-16.
DETAILED DESCRIPTION OF THE INVENTION
[0038] Turning now to the drawings, wherein like components are
designated by like reference numerals. FIG. 1 depicts a flexible or
bladder liquid reservoir assembled as a hydration apparatus. Number
2 references the flexible hydration system and 4 references the
liquid dispensing valve, of the present invention, attached to
flexible tubing 6 on one end and flexible tubing 6 is connected to
flexible reservoir 8 on the other end. Liquid dispensing valve 4 is
shown in a relative accurate position to flexible reservoir 8 when
being worn on the back of a user. Liquid level 10 is shown about
midway in flexible reservoir 8 and distance +X shows a relative
elevation difference between liquid level 10 and liquid dispensing
valve 4. Distance +X may be greater or smaller due to the
positioning of liquid dispensing valve 4 in relation to flexible
reservoir 8 and liquid level 10. The distance +X denotes a positive
static head of pressure in liquid dispensing valve 4 and if liquid
dispensing valve 4 is unable to maintain a positive static head of
pressure, liquid will drain out of liquid dispensing valve 4
draining liquid reservoir 8.
[0039] Referring now to FIG. 2 shows an assembled rigid liquid
reservoir hydration system denoted as 12. One end of flexible tube
6 is connected to liquid dispensing valve 4 and the other end is
attached to a rigid reservoir 14. Liquid level 16 is shown about
midway in rigid reservoir 14. The relative position of liquid
dispensing valve 4 and rigid container 14 is an accurate
representation of a position in actual use with elevation distance
-XX generally denotes a distance maintained by liquid dispensing
valve 4 and liquid level 16 while being transported and operated by
the user. If liquid dispensing valve 4 is unable to maintain this
negative static pressure denoted as -XX the through slit seal will
fail and liquid will drain into reservoir 14.
[0040] In FIG. 3 of the drawings, numeral 4 broadly indicates the
present invention. The liquid dispensing valve 4 is connected to
the proximal end of partially shown flexible tube 6 by an annular
friction fit between the external surface of flexible tube 6 and
internal surface of area 36. Area 36 is annular in shape and open
on one end to the ambient surroundings 40 creating an inlet side of
liquid dispensing valve 4. Flexible tube 6 is connected to a liquid
reservoir (not shown) at a distal end. Annular area 36 is joined to
a rectangle-like chamber, in cross section, comprising opposing
surfaces 18, 20 and at an approximate right angle surface 22 and
24. At the other end of this chamber is an outlet wall that
comprises an inner and outer wall surface. The outer wall surfaces
is comprised of hinge point 28 and 30, scalloped area 32 and 34,
and surface 42 and 44, which will be discussed in later drawing
descriptions. Approximately centered in the outlet wall through
slit 26 connects the internal void of liquid dispensing valve 4 to
the outside area 40 when a significant opposing force is applied to
surface 18 and 20 distorting liquid dispensing valve 4 causing
through slit 26 to open. Through slit 26 is normally forced into a
closed position by tension exerted by the outlet wall and opposing
surfaces 22 and 24. Surfaces 22 and 24 exert a column tension to
the outlet wall as shown by arrows denoted as Y-Y thus aiding
through slit 26 to maintain a closed position.
[0041] FIG. 4 is an alternate embodiment of the present invention.
It functions identical to FIG. 3 with the exception that scalloped
area 32 and 34 are not present and void 70 on wall surface 22 and
void 72 on wall surface 24 are present. Void 70, 72 creates a
weakened area in wall member 22 and 24 respectfully. This weakened
area creates a hinge line for wall member 22 and 24 to flex about.
In the absence of scalloped area 32,34 and the addition of void
70,72 force required on surface 18 and 20 to distort liquid
dispensing valve 4, opening through slit 26 is somewhat equivalent
to the force required for the same action in the embodiment of FIG.
3.
[0042] FIG. 5 is an alternate embodiment to FIG. 3 where liquid
dispensing valve 4 is connected to intermediate component 64 and
intermediate component 64 is connected to outlet end of flexible
tube 6. Liquid dispensing valve 4 is connected to intermediate
component 64 by annular sealing structures 66. Sealing structures
66 mate with internal sealing structures (not shown) in liquid
dispensing valve 4.
[0043] FIG. 6 is a cross section of FIG. 3 being viewed by arrows
denoted as 6-6. Liquid dispensing valve 4 is shown under positive
internal static pressure with outlet wall flexing and increased
pressure denoted by the direction of the arrow. Outlet wall has
inner surface 54 and 56 that is bisected by through slit 26. Inner
wall surface 54, 56 form a curved surface that projects inward
toward the inlet side and is joined to inner surface 52 and 50
respectfully. Four chamber walls along with the outlet surface 54
and 56 forms internal cavity 48. Cavity 48 has continuity to liquid
stored in a liquid reservoir through the inlet side of the liquid
dispensing valve 4, flexible tube 6 and liquid reservoir.
[0044] Positive static pressure in cavity 48 exerts equal pressure
on all surfaces that define cavity 48. Liquid dispensing valve 4 is
constructed of a flexible pliable material and the surfaces
defining cavity 48 will flex under pressure. Positive static
pressure on inner curved surface 54 and 56 will cause surface 54
and 56 to be forced tightly together at through slit 26 thus
increasing the sealing of through slit 26. Inner cavity 48 has a
slight annular projection 58 on the inlet side dividing cavity 48
and annular surface 46. Projection 58 acts as a tactile stop for
engaging flexible tube 6 into annular area 36.
[0045] FIG. 7 is a view of FIG. 6 showing the liquid dispensing
valve 4 with negative static internal pressure. The arrow indicates
direction of pressure and material flexing. When cavity 48
encounters a negative static pressure all surfaces defining cavity
48 equally experience the pressure and flex with a thinner wall
flexing more than a wall of greater thickness. The inner surface 54
and 56 of the outlet wall containing through slit 26 bisecting both
inner and outer surfaces becomes the most flexible wall, due to
being attached by only three sides, and will flex more than the
remaining walls. The outer surface of the outlet wall designated as
42 and 44 are ridges and are designed to maximize sealing of
through slit 26 while under negative static pressure. This sealing
action of ridge 42 and 44 against each other prevents outside air
40 entering into chamber 48. As shown, inner surface 56 and 54 are
slightly separated by the pressure differential on the outlet
wall.
[0046] The outer surface of the outlet wall contains areas of
reduced wall thickness. This void forms a weaker more flexible area
in the pliable material and creates a hinge point. At equal
distance adjacent to through slit 26 is hinge point 28 and 30.
Hinge point 28 and 30 are formed parallel to through slit 26 and
create a controlled pivot of ridge 42 and 44 to its respected hinge
point as surface 42 and 44 cantilever under negative pressure.
Ridge 42 and 44 pivot inward toward cavity 48 increasing the seal
of through slit 26. Scalloped area 32 and 34 creates a weaker
outlet wall at the midline, perpendicular to through slit 26 and
hinge point 32 and 34 which will be discussed further in FIG.
12.
[0047] FIG. 8 shows an alternate embodiment of the present
invention of FIG. 7 showing the liquid dispensing valve 4 with
negative static internal pressure. The arrow indicates direction of
pressure and material flexing. When cavity 48 encounters a negative
static pressure all surfaces defining cavity 48 equally experience
the pressure and flex with a thinner wall flexing more than a wall
of greater thickness. The inner surface 54 and 56 of the outlet
wall containing through slit 26 bisecting both inner and outer
surfaces becomes the most flexible wall, due to being attached by
only three sides, and will flex more than the remaining walls. The
outer surface of the outlet wall designated as 74 and 76 maximizes
sealing of through slit 26 while under negative static pressure.
This sealing action of outlet wall 74 and 76 against each other
prevents outside air 40 entering into chamber 48. As shown, inner
surface 56 and 54 are slightly separated by the pressure
differential on the outlet wall.
[0048] The outer surface of the outlet wall contains areas of
reduced wall thickness. These voids create weaker more flexible
areas in the pliable material and form multiple hinge points. At
equal distance adjacent to through slit 26 on each side are
multiple hinge points 28 and 30. Hinge points 28 and 30 are formed
parallel to through slit 26 and create a controlled pivot of
surface 74 and 76 to its respected hinge point as surface 74 and 76
cantilever under pressure. Surface 74 and 76 pivot against each
other increasing the seal of through slit 26.
[0049] FIG. 9 is a view of FIG. 3 as viewed by arrows denoted as
9-9. This cross section defines cavity 48 with surface 50, 52, 60
and 62. The chamber defining cavity 48 can now be seen to be
rectangle-like in design. The straight walls defined by surface 22,
50 and 24, 52 provide the column strength to the outlet wall as
mentioned in FIG. 3. Walls defined by surface 18, 60 and 20, 62 are
thinner in cross section than walls that provide column strength.
Wall thickness generally defined by surface 24 and 52 will be
denoted as "A" and the wall thickness generally defined by surface
20 and 62 will be denoted as "B". The elastic material of wall
thickness "A" provides the main force to return the liquid
dispensing valve 4 to its original shape after being distorted and
provides additional tension on the outlet wall at all times to seal
through slit 26. When liquid dispensing valve 4 encounters pressure
or distortion of any nature walls with thickness "A" will be the
last to flex and the first to recover. The two walls defined by
surface 22, 50 and 24, 52 provide structure and a secure joining
area of both surfaces of the outlet wall. Walls with thickness "B"
will flex before and recover after walls with a thickness of "A"
recover. The general relationship of wall thickness is, "B" is
generally 40% to 75% of wall thickness "A".
[0050] FIG. 10 shows an alternate embodiment of FIG. 9 with void 70
in wall surface 22 and void 72 in wall surface 24. Void 70 and 72
weakens its respective wall member creating a location for flexing
of wall members and projection 78, 80 strengthen opposing wall
surfaces 18, 20 respectfully.
[0051] FIG. 11 shows an alternate embodiment of FIG. 9 with wall
surface 22,50 and 24,52 are curved outward away from cavity 48.
Void 70 in wall surface 22 and void 72 in wall surface 24 weakens
its respective wall member creating a fixed location for flexing of
wall members. All specifications of FIG. 9 also apply in FIG.
11.
[0052] FIG. 12 shows a view of the invention while being compressed
by a biting force on surface 18 and 20 as denoted by arrows. Force
applied to surface 18 and 20 exerts a force to collapse the outlet
wall opening through slit 26. Ridges 42 and 44 fold inward about a
lateral line denoted by dash line M-M. Scalloped area 32 and 24
form a void in the outer surface allowing 42 and 44 to flex inward
as noted.
[0053] FIG. 13 shows a cross section of FIG. 12 as viewed by arrows
denoted as 13-13. A biting action on surface 18 and 20 compresses
inner surface 60 and 62 to decrease volume in cavity 48. The biting
action forces the liquid dispensing wall to flex inward toward
cavity 48. Through slit 26 is forced open allowing liquid to pass
through liquid dispensing valve 4. Sealing surface 68 of through
slit 26 can now be viewed as it flexes inward protecting sealing
surface 68 from exposure to dirt and foreign objects.
[0054] FIG. 14 shows a cross section of FIG. 12 as viewed by arrows
denoted as 14-14. This view shows through slit 26 opening toward
cavity 48 and sealing surface 68 pivoting inward toward cavity 48.
The arrow depicts direction of liquid flow as liquid moves through
liquid dispensing valve 4 into outside area 40.
[0055] FIG. 15 shows an alternate embodiment of FIG. 12. Void 70
and 72 are present in wall surface 22 and 24 respectfully. Wall
surface 22 and 24 are shown flexing about the void present in each
surface.
[0056] FIG. 16 shows a cross section view of FIG. 15 as viewed by
arrows denoted as 16-16. Wall members 22, 50 and 24,52 are seen
flexing outward from cavity 48. Void 70 and 72 are extended as wall
members 22, 50 and 24, 52 force void 70 and 72 open under pressure.
Wall members 22, 50 and 24, 54 flex about dashed line denoted as
M-M which bisects void 70 and 72.
[0057] The present invention has been described and depicted in
terms of the preferred embodiment. The invention is not limited,
however, to the embodiment described and depicted. Rather the
invention is defined by the claims.
* * * * *