U.S. patent application number 09/801997 was filed with the patent office on 2001-07-19 for limited flow device.
Invention is credited to Porter, Jerry.
Application Number | 20010008241 09/801997 |
Document ID | / |
Family ID | 23516754 |
Filed Date | 2001-07-19 |
United States Patent
Application |
20010008241 |
Kind Code |
A1 |
Porter, Jerry |
July 19, 2001 |
Limited flow device
Abstract
A container for dispensing a predetermined amount of liquid
through a dispensing tube is disclosed. A valve is dimensioned to
contain and dispense a predetermined about of liquid and dispense
the liquid through a dispensing tube in contact with the valve. The
liquid is in fluid contact with the inlet port when the base is in
a first position and out of fluid contact with the inlet port when
the base is in a second position. Thus, the valve fills with liquid
when the container is in a substantially horizontal position while
angling the container removes the liquid from contact with the
valve and stops the fluid flow. Preferably the container has a
sealable, watertight lid that receives the dispensing tube and
incorporates vent holes to enable airflow into the container. The
fluid inlet port can be placed in the side or top of the valve. The
valve can alternatively be a tube with fluid and tube inlets in
fluid communication. An air vent can be incorporated within the
dispensing tube to prevent using the dispensing tube as a straw, it
is preferable to include a drinking shield.
Inventors: |
Porter, Jerry; (Kensington,
MD) |
Correspondence
Address: |
Parker & DeStefano
300 Preston Avenue Suite 300
Charlottesville
VA
22902
US
|
Family ID: |
23516754 |
Appl. No.: |
09/801997 |
Filed: |
March 8, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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09801997 |
Mar 8, 2001 |
|
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09384296 |
Aug 26, 1999 |
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Current U.S.
Class: |
220/709 ;
220/714 |
Current CPC
Class: |
A47G 19/2266
20130101 |
Class at
Publication: |
220/709 ;
220/714 |
International
Class: |
A47G 019/22 |
Claims
What is claimed is:
1. A container for repeatedly dispensing a maximum, predetermined
amount of liquid directly into a user's mouth through a dispensing
conduit, said container comprising: a) a vessel, said vessel
comprising a liquid containing enclosure and a upper closure
member, said liquid containing enclosure and said upper closure
member being mated to form said vessel, b) a valve, said valve
having a liquid containing region and an inlet, said liquid
containing region being dimensioned to contain a predetermined
volume of liquid, said valve inlet being positioned to receive said
liquid when in a horizontal position and above the liquid level of
said liquid when in a dispensing position, c) an elongated
dispensing conduit, said dispensing conduit having a first region
and a second region, said first region first end being within said
vessel and being in fluid communication with said valve liquid
containing region, said dispensing conduit second region having an
outlet end outside of said container, said dispensing conduit first
region and said valve member having a predetermined combined
volume, said dispensing conduit first region having an interior
volume that is less than about 25% of said combined volume.
2. The container of claim 1, wherein each of said liquid containing
enclosure and said upper closure member being cup shaped members in
liquid tight engagement with each other.
3. The container of claim 2, wherein the diameter of said liquid
containing enclosure is greater than the maximum fill height of
said liquid containing enclosure.
4. The container of claim 3, wherein said maximum fill height is
approximately 80-90% of the diameter of said liquid containing
enclosure.
5. The container of claim 1, further comprising an anti-siphon
vent, said anti-siphon vent being between said dispensing conduit
second region outlet end and said first region first end, said
anti-siphon vent being out of fluid communication with liquid in
said liquid containing enclosure and in fluid communication with
ambient air.
6. The container of claim 5, wherein said anti-siphon vent is an
air break in said dispensing conduit second region outlet end.
7. The container of claim 1, further comprising an anti-siphon
vent, said anti-siphon vent being a conduit having a first end open
to the ambient air and a second end in communication with said
dispensing conduit.
8. A container for dispensing no more than a predetermined amount
of liquid directly into a user's mouth by gravity flow through a
dispensing conduit, said container comprising: a) a lower liquid
containing enclosure and a upper closure member, said liquid
containing enclosure and said upper closure member being mated to
form said container, said lower liquid containing enclosure having
an upper edge, said upper edge being a maximum fill level, b) a
valve member, said valve member having a liquid containing region
and an inlet, said liquid containing region being dimensioned to
contain a predetermined volume of liquid, c) a dispensing conduit,
said dispensing conduit having a first region and a second region,
said first region being within said container and having a first
end in fluid communication with said valve liquid containing
region, said dispensing conduit second region having an outlet end,
wherein when said liquid containing enclosure is filled with liquid
to a predetermined fill level, the relationship of the maximum fill
level of said liquid, the position of said valve in said container,
and said dispensing conduit outlet end is such that when said
container is rotated toward a gravity dispensing position,
dispensing cannot not commence until said valve inlet is above the
horizon of said liquid.
9. The container of claim 8, wherein the height of liquid at said
predetermined liquid fill line is equal to no greater than about 80
to about 90% of the diameter of said container.
10. The container of claim 8, wherein said dispensing conduit first
region and said valve member have a predetermined combined volume,
said dispensing conduit first region having an interior volume that
is less than about 25% of said combined volume.
11. The container of claim 8, wherein said valve is offset from a
center point of said liquid containing enclosure and is adjacent to
a liquid containing enclosure side, wherein said dispensing conduit
outlet end is offset from said center point in the direction
opposite said offset of said valve.
12. The container of claim 8, wherein said dispensing conduit's
total volume is less than said measuring valve's total volume.
13. The container of claim 12, wherein said dispensing tube volume
is less than about 25% of the combined volume of said measuring
valve and said dispensing conduit.
14. The method of gravity dispensing a measured amount of liquid
from a container, through a dispensing conduit directly into a
user's mouth, said container comprising a lower cup shaped member
and a closure member, said cup shaped member and said closure
member forming a vessel, a valve and a dispensing conduit, said
vessel having a diameter, said valve having a liquid containing
region and a valve inlet, said liquid containing region being
dimensioned to contain a predetermined volume of liquid, said
dispensing conduit having a first end and a second end, said first
end being in fluid communication with said valve liquid containing
region, said dispensing conduit extending through said vessel
closed end and having said second end spaced from said vessel
closed end, said method comprising the steps of; a) filling said
cup shaped member with a predetermined amount of liquid up to the
maximum capacity of said cup shaped member, b) rotating said
container from a first upright position to a second position, in
said second position said valve inlet being above the horizon of
said liquid when said cup shaped member is filled to its maximum
capacity, and c) commencing the gravity dispensing of liquid when
said container is in said second position, d) said lower vessel,
said dispensing conduit, and said valve liquid containing region
having relative dimensions and positions such that the gravity
dispensing of liquid terminates when no more than said measured
volume of liquid from said valve liquid containing region has been
dispensed through said dispensing conduit second end to said user's
mouth.
15. The method of gravity dispensing a measured amount of liquid
from a container, through a dispensing conduit directly into a
user's mouth, said container comprising a lower vessel, a closure,
a valve and a dispensing conduit, said valve having a liquid
containing region and said dispensing conduit having a first end
and a second end external of said container, said first end being
in fluid communication with said valve liquid containing region and
said second end providing gravity delivery of liquid to a user,
said method comprising the steps of: a) filling said lower vessel
with a predetermined amount of liquid, b) sealing said closure to
said lower vessel, c) rotating said container from a first upright
position to a second position, in said second position said valve
inlet being above the horizon of said liquid, said valve liquid
containing region and said dispensing conduit containing no more
than said measured amount of liquid, d) commencing the gravity
dispensing of liquid upon said container being in said second
position, and e) the maximum capacity of said lower vessel being
such that upon termination of the gravity dispensing of liquid no
more than said measured volume of liquid from said valve liquid
containing region and said dispensing conduit can be dispensed
through said dispensing conduit second end to said user's
mouth.
16. The method of claim 15, wherein said dispensing conduit's total
volume is substantially less than said measuring valve's total
volume.
17. The method of claim 15, said dispensing tube volume being less
than about 25% of the combined volume of said measuring valve and
said dispensing conduit such that a relatively consistent dispensed
volume is maintained during repeated dispensing of said measured
volume of liquid.
18. The method of claim 15, comprising repeating steps (c) through
(e), said dispensing tube volume being less than about 25% of the
combined volume of said measuring valve and said dispensing conduit
such that a relatively consistent dispensed volume is maintained
during repeated dispensing of said measured volume of liquid.
Description
CROSS-REFERENCE TO RELATED PATENT APPLICATION
[0001] The present application is a continuation-in-part of
copending patent application Ser. No. 09/384,296, filed Aug. 26,
1999. This application incorporates by reference, as though recited
in full, the disclosure of said co-pending patent application.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention discloses a cup that will dispense a
predetermined amount of fluid to a user using a valve having no
moving parts.
[0004] 2. Brief Description of the Prior Art
[0005] When a person suffering from dysphagia attempts to swallow
liquid in the normal amounts, the liquid often goes down the
bronchus and into the lungs, causing coughing, choking and even
aspiration pneumonia. This difficulty is exacerbated when the user
tilts his head backward in the normal drinking position. Dysphagia
is a condition associated with stroke, head injury, or other
neurological disorders, and aging, and frequently occurs as a
transient condition following some surgeries.
[0006] It is known that swallowing in people suffering from
dysphagia may be enhanced if the head is not angulated rearwardly
while drinking. In an attempt to take advantage of this,
"nose-cups" have been designed which include a container part whose
inner wall is circular in shape and a cutout on the rim to
accommodate the nose of the user. This permits drinking while the
user's head remains substantially vertical. However, such cuts have
an unusual appearance, which some users may find undesirable and
thus avoid using. Additionally, such conventional "nose-cups" have
cylindrical inner walls that do not facilitate controlled fluid
flow, tending to lead to fluid spillage. Another attempt to
overcome the problem includes a cup with an exaggerated
beaker-shaped pocket formed for the nose.
[0007] U.S. Pat. No. 5,323,928 to Stevens provides a drinking cup
that includes a hollow container portion having a base and an
upwardly extending side wall. The side wall defines an elliptical
aperture at its apex. The inner surface of the sidewall defines an
ellipse from a horizontal cross-sectional perspective at
substantially all elevations between the aperture and a point
proximate to the base of the container portion. The user's nasal
bridge is accommodated within the aperture during drinking to
prevent substantial backward angulation. Although the '928 patent
provides a better gripping area and funnels the liquid to the
center of the user's mouth, it does not control the amount of
liquid dispensed to the user.
[0008] One solution posed by practicing speech pathologists is a
drinking vessel which releases a measured amount of liquid, about 1
teaspoon, which is the amount that will be able to be swallowed by
the person with dysphagia by virtue of filling and emptying of the
diverticular pouches in larynx. Other solutions include
spoon-feeding liquids one teaspoonful at a time or using gelling
agents to thicken the liquid so it can be eaten like solid
food.
[0009] In U.S. Pat. No. 5,222,940 Wilk discloses a device for
facilitating the administration of medicine comprising a tube
having a cup-shaped member at the distal end. The cup-shaped member
contains markings to measure the medicine to be administered.
Although this device serves for applications of small amounts of
medicine, its overall design eliminates its use as a drinking cup
as disclosed herein.
[0010] Prior art devices are complex and none mimic the action of
simply lifting the drinking vessel to the lips. The disclosed
drinking cup incorporating the limited flow valve has overcome the
problems associated with the prior art.
SUMMARY OF THE INVENTION
[0011] The disclosed cup utilizes a measuring valve, having no
moving parts, situated in a container that regulates the flow of
liquid, delivering a predetermined quantity of liquid to the user
by rotating the container. Once the valve is filled, the container
is rotated to a position where fluid is no longer covering the
inlet of the valve. Once the inlet is exposed to the air within the
container, the fluid is free to move out of the valve and down the
dispensing tube. Further rotation delivers the fluid, through
gravity, with the process being repeated to dispense the desired
quantity of liquid. The container consists of a vessel having at
least one side, an open end and a base and, in most embodiments, a
watertight lid. If a lid is not used, a clip can be placed adjacent
the open end to receive the dispensing tube. Within the container
is a valve that has at least one side, a height, a dispensing tube
inlet and a fluid inlet port. Preferably the valve is adjacent to
the base in a position to receive liquid through the fluid inlet
port and in some embodiments the valve can be integral with the
base. The liquid is dispensed through use of a dispensing tube
having a first end in contact with the dispensing tube outlet port
and a second end exiting the vessel. To ensure proper dispensing,
the exiting point of the dispensing tube must have a distance from
the base greater than the height of the valve.
[0012] The valve is dimensioned to contain and dispense a
predetermined amount of liquid. The liquid is in fluid contact with
the inlet port when the base is in a first position and out of
fluid contact with the inlet port when the base is in a second
position. Thus, the valve fills with liquid when the container is
in a substantially horizontal position while angling the container
removes the liquid from contact with the valve, stopping further
fluid from entering the valve inlet port. The fluid within the
valve cannot be delivered until the container is in the second
position, bringing the inlet port into contact with the container
air.
[0013] Preferably the container has a sealable, watertight lid at
the open end that contains a dispensing tube receiving port
dimensioned to receive the dispensing tube. When sealing the
container with a lid, at least one vent hole, preferably within the
lid, must be used to enable airflow into the container. In some
embodiments, a retaining ridge can be placed within the interior of
the container and dimensioned to receive a lid. The lid and the
ridge should interact to prevent passage of fluid past the lid. The
lid can also contain a refill inlet to enable liquid access without
removal of the lid. The refill inlet can have a watertight lid to
prevent liquid transfer from the vessel or a cover to enable air
transfer into the vessel.
[0014] The valve can be a polygon with a top plate and can be
offset from a center point, and positioned adjacent to the
container side. It preferably is proximate the base of the vessel.
In some embodiments, when the valve is not placed adjacent to the
base, the valve has an opposing base. In most embodiments, at least
a portion of the valve tube inlet is cut within the top plate to
enable maximum effectiveness. The fluid inlet port can be in the
side of the valve, preferably with a height equal to the height of
the valve, or placed in the top plate of the valve. When the fluid
inlet port is on the side of the valve it is generally adjacent to
the container side. The valve can be removably maintained within
the container through the use of flanges that are integral to the
base and dimensioned to receive the valve in a friction fit. When a
side inlet is used, the flanges must be dimensioned so that they do
not impede fluid communication between the inlet port and the
vessel. In another embodiment the valve is a tube having a fluid
inlet at a first end and a tube inlet at a second end. The first
end of the dispensing tube and the valve tube inlet are in fluid
communication and can, optionally, be an integral unit. This
embodiment can also contain retaining clips affixed to the base
and/or sides to affix the valve and dispensing tube to the
container.
[0015] The container can have a raised base containing a valve
receiving area dimensioned to receive the valve. The height of the
raised base adjacent to the sides is greater than the base height
adjacent to the valve, sloping downward to the valve height at the
valve receiving area.
[0016] In embodiments where there is a tube vent incorporated
within the dispensing tube, it is preferable to include a drinking
shield with at least a portion of the interior dimensioned to
receive the dispensing tube and tube vent and an exterior
configured to facilitate drinking. The drinking shield can be
permanently or removably affixed to the lid or, as an option,
manufactured as an integral part of the lid. To facilitate removal
the lid can have flanges dimensioned to receive the drinking
shield, enabling the shield to snap on and off. The shield,
especially when an integral part of the lid, can have a base
containing air holes to enable air flow into the vessel.
[0017] In one design the container contains a vent chamber within
the container adjacent the lid, enabling the dispensing tube air
hole to be located within the container. The vent chamber is in air
communication with ambient air and can be positioned to vent the
dispensing tube air hole, thereby preventing inadvertent blockage
of the hole
[0018] The liquid measuring valve enables fluid to enter the valve
and the dispensing tube when the container is at a first position
and prevents liquid from entering the tube when the container is in
a second position. The valve and dispensing tube are dimensioned to
contain, and dispense, a predetermined amount of liquid. The amount
of liquid reduces, proportionally, to the reduction of liquid
volume within the container. In order for the valve to dispense a
regulated amount, the liquid must be at or below a predetermined
fill level. The predetermined fill level is determined by the
volume of liquid remaining in the container upon exposure of the
inlet to container air when in said second position.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The advantages of the instant disclosure will become more
apparent when read with the specification and the drawings,
wherein:
[0020] FIG. 1 is a cutaway side view of the limited flow cup of the
instant disclosure;
[0021] FIG. 2 is a perspective view of the valve of FIG. 1;
[0022] FIG. 3 is an exploded cutaway side view of the limited flow
cup of FIG. 1;
[0023] FIG. 4 is an alternate measuring valve having a floor;
[0024] FIG. 5 is a cutaway side view of a limited flow cup using
the valve of FIG. 4;
[0025] FIG. 6 is a cutaway perspective view of an alternate
embodiment incorporating flanges to maintain the valve in
position;
[0026] FIG. 7 is a perspective view of the valve and flanges of
FIG. 6;
[0027] FIG. 8 is a side view of a shield manufactured as part of
the top;
[0028] FIG. 9 is a top view of the shield of FIG. 8;
[0029] FIG. 10 is a cutaway side view of an alternate embodiment of
the invention for use as a replacement for a standard glass;
[0030] FIG. 11 is a cutaway side view of an alternate embodiment
using an L-shaped tube/valve combination;
[0031] FIG. 12 is an exploded cutaway side view of an alternate
embodiment of a limited flow cup;
[0032] FIG. 13 is a cutaway side view of a liquid dispenser
incorporating the limited flow valve;
[0033] FIG. 14 is a cutaway side view of an additional embodiment
of a limited flow cup having a recessed measuring valve and sloping
floor;
[0034] FIG. 15 is a cutaway side view of a limited flow cup using
an alternate valve design;
[0035] FIG. 16 is a perspective view of the valve design of FIG.
15;
[0036] FIG. 17 is an exploded side view of a mouthpiece, tube and
valve for use with the cup embodiments disclosed herein;
[0037] FIG. 18 is cutaway side view of an alternate design to FIG.
11 using clips to retain the dispensing tube
[0038] FIG. 19 is a cutaway side view of an alternate design
incorporating a venting chamber within the top; and
[0039] FIG. 20 is a cutaway side view of an open valved cup having
a dispensing tube retaining clip.
DETAILED DESCRIPTION OF THE INVENTION
[0040] The disclosed limited flow cup overcomes the difficulties of
efficiently and safely administrating thin liquids, such as water,
milk, etc., to people suffering from swallowing dysphagia. Although
dysphagia, or difficulty in swallowing, can have a number of
causes, they all result in the potential to choke or have fluid
pass directly into the lungs. In addition to its use by people
suffering from dysphagia, the limited flow cup can also be used to
administer medication; by bikers or runners for drinking water; or
by children as a special cup.
[0041] The disclosed cup, without the use of moving parts,
automatically dispenses liquids in a predetermined quantity. Unless
noted otherwise, all reference to sizing, ratios, etc. will be
directed to the use of the cup with people suffering from
dysphagia. Dysphagia provides the greatest number of criteria to
meet and any device meeting these criteria can be used for other
applications. In some applications the cup may be filled at the
place of manufacture and shipped pre-filled with medication, juice,
or other fluid. Pre-filling is advantageous when the cup is being
used for dispensing medications, such as liquid antibiotics. The
valves on the pre-filled cups would be calculated to dispense the
prescribed amount of medication, thereby increasing the ease of
administering the medication to the patient. Pre-filling also is
helpful in circumstances in which it is desirable to restrict the
patient's ability to open the cup and defeat its controlled dosage
mechanism. In most embodiments, the container is manufactured from
a rigid material to prevent the cup from being squeezed to dispense
additional fluid.
[0042] The limited flow cup 10, illustrated in FIGS. 1, 2, and 3 is
comprised of a container 12, measuring valve 14, valve inlet 16 and
dispensing tube, or straw, 18. The container 12 consists of a top
24 and vessel 22 that are retained together in a manner to prevent
leakage or accidental separation. One method of retaining the top
24 and vessel 22 is through use of a snap seal as illustrated in
FIGS. 1 and 3. In this Tupperwear.RTM. type of seal, a receiving
rim 36 is provided that interacts with a locking ridge 32 on the
vessel 22. Other methods, such as screw tops or simple snap seals,
can also be used and will be evident to those skilled in the art.
The measuring valve 14 is a chamber having a top and closed
side(s). As explained in more detail hereinafter, the interior
volume of the measuring valve 14 is less than the predetermined
amount of liquid to be dispensed. The liquid enters the measuring
valve 14 through an inlet port 16 and exits the measuring valve 14
through a dispensing tube outlet port 20. To ensure that an air
pocket will not form within the valve 14, the inlet port 16 has a
height equal to the height of the valve 14. Preferably, as
illustrated in FIG. 2, the inlet port 16 is cut a short distance
into the top of the measuring valve 14 to permit easy filling
without the creation of air pockets. A dispensing tube, or straw,
18 is secured to the dispensing tube outlet port 20 at one end and
exits the top 24 to permit the user to pour the liquid out of the
vessel 22. In the illustrated embodiment, air vents 34 have been
provided in the top 24 of the vessel 22 to permit air to enter the
closed container 12, thereby preventing a vacuum from forming.
Depending upon the application, air vents will not always be
required and the need to incorporate the vents will be obvious to
those skilled in the art.
[0043] Optimum functionality is dependent upon the dimensioning
between the elements disclosed herein which include:
[0044] the height of the valve body;
[0045] the diameter of the vessel;
[0046] the angle and diameter of the tube;
[0047] the position of the valve relative to the floor of the
vessel; and
[0048] the orientation of the valve to the fluid.
[0049] The disclosed cup is intended to repeatedly dispense a
predetermined amount of fluid. The predetermined amount of fluid is
initially measured by filling the valve and tube, through the inlet
port, when the container is in a first position on a horizontal
plane. The valve inlet breaks the fluid horizon in a second
position, stopping in flow to the valve and at the third position
the predetermined amount of fluid is, due to gravity, completely
dispensed. For ease of explanation, reference will be made to a
triangle formed within the container by the dispensing tube, wall
and base. Although this is, in most embodiments, not a literal
triangle but a figurative triangle, the triangle reference provides
references points to facilitate description. The angles of the
triangle are the junctures of the base/dispensing tube, the
dispensing tube/side wall and the side wall/base. In the first
position the tube outlet, at the dispensing tube/side wall
juncture, is at the apex of the triangle. The valve inlet breaks
the surface of the liquid in a second, intermediate position that
places the base/dispensing tube juncture about midway between the
base and the apex of the triangle. The measured dose of fluid is
completely dispensed when the container is rotated to a third,
non-horizontal position, placing the base/dispensing tube juncture
at the apex of the triangle. The placement of the inlet port above
the plane of the outlet during dispensing ensures that additional
liquid does not enter the valve during side-to-side movement. It
should be noted that the ratio of vessel size, valve size and
predetermined fill level prevents fluid from being dispensed from
the dispensing tube prior to the valve inlet breaking the liquid's
surface. The amount of liquid dispensed after each use decreases
after each dispensing. Since the fluid level within the cup is
lower, the quantity retained within the tube is lower, reducing the
dispensed amount. The quantity reduction presents no health or use
problems when the device is used as a drinking container and would
only be addressed when used to dispense medication, and can be
re-dimensioned according to the type of medication, etc. The
minimization of the quantity reduction is does, however, increase
the criticality of the dimensioning of the dispensing tube and the
valve. To avoid a dramatic drop in the quantity dispensed in each
use, the valve must contain the greater portion of the total
dispensing volume of liquid. In the preferred embodiment, the
volume of the dispensing tube is less than about 25% of the
combined volume of the dispensing tube and measuring valve. If the
diameter of the straw is sufficient to retain a major portion of
the total volume, the volume decrease between applications would be
more dramatic.
[0050] In some applications the foot valve, such as disclosed in
FIG. 2, provides benefits over the tube valve disclosed in FIGS. 11
and 18. In the foot valve embodiment, the design is such that
additional liquid is prevented from entering the valve during the
side-to-side movement of the cup that can occur during use. This
occurs because the foot valve fills with water and does not empty
until a point in the device's operational rotation where the valve
inlet is above the level of the liquid remaining within the
container. At that point, if the container is rotated from side to
side, the valve inlet does not come to a position where liquid can
again enter. The tube valve will also measure and dispense a
predetermined amount of liquid, however it does not prevent
additional liquid from entering the valve during any side-to-side
movement. Although the amount of additional liquid that would enter
at one time is not substantial, the additional liquid can cause
medical problems in some instances. It will be evident to those
skilled in the medical arts when the additional safety precautions
provided by the foot valve should be implemented.
[0051] To prevent the liquid from continuing to enter the measuring
valve, the liquid level must not cover the valve inlet from the
point where the container commences dispensing the fluid to the
completion of dispensing process. To achieve an optimum
predetermined dispensing, or fill, level, which provides safe
dispensability while holding the maximum amount of liquid, the base
and sides of the container must comprise sufficient volume to
accommodate the liquid, maintaining it clear of the inlet, while
drinking. To maintain the diameter of the container as small as
possible while holding the maximum "safe" quantity of liquid, the
top is preferably domed as this enables a portion of the liquid to
be retained in the top as well as the body of the cup during the
drinking process. Because the valve must be uncovered during the
tilting and drinking process, the amount of liquid able to be
placed within the container must be restricted. Two of the factors
determining the predetermined fill level are the diameter and
height of the container, and can be calculated on an individual
basis. The amount of fluid a vessel can contain is must also take
into consideration the diameter of the vessel to the height of the
valve inlet. Although the relationship will vary depending upon end
use, the preferred relationship is approximately 80-90% of the
diameter of the container equals the maximum height of fluid in the
container at which point the multiple dispensing effects begin.
When using the device on a day-by-day basis, the predetermined
dispensing level can be determined by filling the cup to about 90%
of capacity and pouring out the liquid until the valve inlet
reaches the second position of being above the water horizon. Any
of the embodiments disclosed herein can also be provided with a
maximum fill line.
[0052] When determining the ratios between the container diameter
and the valve and angle of the dispensing tube, the dispensing
angle of the container must also be taken into consideration. To
comfortably dispense the liquid, the user should not be required to
rotate their head beyond a normal drinking angle. Thus, a straw and
valve arrangement as illustrated in prior art sugar containers as
disclosed in U.S. Pat. No. 2,148,421 to H. E. Allan would require
too much head rotation to enable comfortable use. This arrangement,
wherein the straw and "valve" are parallel with the container wall
and in a direct line with the dispensing inlet further requires 180
degrees of rotation prior to the contents moving beyond the base
inlet. In addition to the discomfort cause by the need for
extensive head rotation, the amount of liquid dispensed would be
dependent upon the rapidity of rotation rather than any internal
measuring device. Further, since there is no method of measuring
then dispensing in the Allen device, there is no method of
measuring a predetermined amount and then safely dispensing that
amount. Since this, and similar devices, are designed to dispense
granular material, the methods for measuring and dispensing taught
in Allen would not be feasible for liquids. In the Allen device,
the liquid would continue to flow through the straw until
sufficient liquid has been dispensed to expose the dispensing
inlet.
[0053] As stated heretofore, the amount dispensed equals the volume
of the valve body, plus the volume of fluid in the dispensing tube.
Due to the pressure created by the level of the fluid within the
container, the tube will fill to the current level of the liquid
within the container. Thus, the total volume dispensed will
decrease with each dispensing, eventually falling below the volume
of the valve chamber. It is therefore critical when calculating the
volume to be dispensed that the maximum amount of liquid being
retained in the tube be added to the measuring valve chamber
volume. Thus, if a person can only swallow one (1) teaspoon of
liquid, the volume of the chamber plus the maximum contained within
the tube through pressure equalization should be one (1)
teaspoon.
[0054] In the embodiment of the limited flow cup 10, illustrated in
FIGS. 1 and 3, the dispensing tube 18 exits the closed container 12
at approximately a 45.degree. angle from the base vessel 22 of the
container 10. As described in more detail hereinafter, the tube can
be at a variety of angles, with the optimum angle being dependent
upon the end use. When the dispensing tube exits the container
along the sidewall, the point of exit must be a greater distance
from the base than the height of the valve inlet to maintain the
liquid within the container in a first, non-tilted position. The
45.degree. angle, achieved by placing the valve 14 opposite the
tube outlet 38, enables the user to drink from the container
without tilting his head back. The angle between the tube and the
base can be reduced dramatically; however the tube outlet must have
an outlet to base distance greater than the height of the
valve.
[0055] In the illustrated embodiment, the valve 14 is free to move
within the vessel 22. In order to maintain the desired angle
between the valve 14 and the outlet 38 while enabling the valve 14
to remain in contact with the bottom of the vessel 22, the
connections between the various parts must not be easily dislodged.
To accomplish this, the tube 18 and valve 14 are manufactured of a
rigid, inert material that can be safely affixed to each other. The
valve 14 can be formed without a bottom so that the base of the
vessel 22 forms a seal with the valve 14. The valve outlet port 20
is cut at an angle that ensures that the tube 18 can only be
inserted at the desired angle. The tube 18 is then secured to the
valve 14 by any means applicable to the materials of manufacture.
The outlet 38 in the top 24 is preferably a friction fit to
maintain the valve 14 in contact with the bottom of the vessel 22.
One advantage of maintaining the valve 14 as removable is the
ability to easily clean the unit. Alternatively, as illustrated in
FIGS. 4 and 5, the valve 450 can be provided with a bottom plate
452 so that firm contact with the bottom of vessel 457 is not
required for the cup to function. The inlet port 453, as
illustrated, is cut along the side and top of the valve 450, as
described heretofore. The inlet port in this embodiment can also be
located within the top of the valve.
[0056] To prevent the disclosed device from being used as a
standard cup and straw, a tube vent 40 is preferably cut into the
tube 18. Although the tube vent 40 can be of variable size, it is
preferable that the vent 40 be equal to or greater than the area of
the cross section of the tube 18. To prevent any liquid from
entering the tube vent 40, the vent 40 is cut from the tube 18 at a
point above the top 24. The vent 40 must be cut from the portion of
the tube 18 opposite the user to prevent the liquid from pouring
out while drinking. If the user sucks on the tube 18 while the cup
10 is in an upright or slightly rotated position, no fluid will be
removed from the vessel 22 as the vent 40 will simply draw air into
the tube 18. Since the area of the vent 40 is preferably larger
than the area of the cross section of the tube 18, air will be
easily drawn in rather than the fluid contained in the vessel.
[0057] In order to prevent a user from putting his finger over the
tube vent 40, either intentionally or inadvertently, a shield 42 is
placed over the tube 18. The shield 42 as illustrated, is
configured similar to a child's sipper cup mouthpiece; however this
is for design only and is not intended to limit the scope of the
invention. The purpose of the shield 42 is primarily to prevent the
tube vent 40 from being blocked, however the shield can be modified
to retain and permit liquid flow back into the cup. The shield 42
is provided with air vents 76 and is maintained on the tube 18
through a friction fit. The tube 18 should have a length sufficient
to enable the open end 78 of the tube 18 to be at, or slightly
beyond, the shield edge 70 while the base of the shield is in
contact with the top 24. The assembly of the valve 14, tube 18 and
shield 42 is illustrated in FIG. 17 incorporating an optional wrap
around shield 80. The wrap around shield 80 prevents the user from
covering the drinking shield with the mouth and defeating the
pressure equalization provided by the air vents. Alternatively, the
lid of the container can be designed in such a way as to prevent a
user from placing his/her mouth completely over the tube vent 40.
This can be accomplished by forming a radial groove around the lid
or an indentation positioned to receive the dispensing tube in a
manner to maintain the tube vent recessed below the lid surface.
Other methods of preventing contact with the tube vent will be
apparent to those skilled in the art.
[0058] The cup 10, as illustrated in FIGS. 1 and 3, is easily used
as a fill and ship unit that is filled by the manufacturer and
shipped to an end user. This is especially beneficial for hospitals
and nursing homes where the level to which the cup can be filled is
critical and attendant time is limited. The sealed units are also
advantageous for dispensing predetermined doses of medicine. When
manufactured as a disposable unit, the plastic can be lighter
weight than in the reusable units. Additionally, the valve within
the disposable units can be affixed to the units through either an
inert adhesive or manufactured as an integral part of the unit. The
diameter of the tube in the disposable units is also not as
critical as future cleaning is not an issue.
[0059] FIGS. 6 and 7 illustrate an alternate embodiment of the
limited flow cup 10. The vessel 54 of the limited flow cup 50 is
manufactured with a valve-retaining flange 62 that is dimensioned
to receive the valve 60 in a friction fit. By using the retaining
flange 62 to prevent the valve 60 from moving within the vessel 54,
the tube 56 can be of lighter weight and, if desired, replaceable.
Since a major concern is cleaning, the retaining flange 62 permits
the measuring valve 60 to be snapped in and out. The retaining
flange 62 can be manufactured as a single unit or multiple pieces,
depending upon manufacturing preference. As with the valve 14, the
angle of the outlet 64 is such to allow the tube 56 to only be
inserted at the predetermined angle. In this embodiment, the valve
inlet 68 has been moved to the top of the measuring valve 60,
adjacent the tube outlet 64. In embodiments where the inlet 68 is
on the top of the measuring valve 60, no fluid will be dispensed
once the level of the fluid drops below the height of the valve.
This provides the assurance that the minimum quantity dispensed is
equal to the volume of the valve.
[0060] The top 52 is provided with fill port 58 that permits
refilling of the vessel 54 without necessitating removal of the top
52. The fill port 58 can also contain the air hole(s) to prevent a
vacuum from being formed within the cup 50. In this embodiment the
tube 56 does not incorporate the air hole as illustrated in FIGS. 1
and 3. Difficulty in swallowing has various causes and the
precautions required for someone with impaired executive functions
are far more stringent than for a person with dysphagia caused by
surgery. Since not all people with swallowing difficulties require
the same careful monitoring, the limited flow cup 50 does not
include the "fail safe" features incorporated within the limited
flow cup 10. It should be noted, however, that any of the features
disclosed herein can be incorporated in any of the embodiments
disclosed herein.
[0061] An alternate to this valve design is illustrated in FIGS. 15
and 16 wherein the valve 408 has a base inlet 406. The pair of
retaining flanges 402 are positioned to form an inlet 404 that has
a size approximately equal to, or greater, that the size of the
base inlet 406. Alternatively, one flange can be used, with an
opening being left in the flange adjacent base inlet 406. This
enables the liquid to enter the valve 408 through the flange inlet
404 and base inlet 406. When the valve 408 is replaced after
cleaning, the base inlet 406 and the flange inlet 404 must be
aligned to permit maximum flow. As the valves in all embodiments
require alignment to enable the tube to be properly inserted, any
additional alignment between the inlets 406 and 404 will be
minimal.
[0062] FIGS. 8 and 9 illustrate a shield 70 that is molded as part
of the cup lid 80. The tube 72 of the shield 70 extends from the
liquid outlet 76 into the cup (not shown). To allow for sufficient
airflow and prevent the user from blocking the air hole 82, vents
78 are dispersed around the shield 70. This is an example of one
shield design and any number of designs can be incorporated. The
critical features of any design are the incorporation of the vents
and air hole while preventing blocking by the user's fingers.
[0063] The air hole, when combined with the vessel/valve and an
exhaust tube will prevent sucking fluid in any position. If the
vessel is level or tipped to the delivery of fluid from its
terminus, sucking will draw in air and any fluid contained in the
tube above the hole. The air hole can be incorporated into any of
the embodiments disclosed here.
[0064] FIG. 10 provides a substitute for a standard glass by
incorporating the limited flow valve 102 in a glass, or
Plexiglas.RTM., drinking glass 100. The valve 102 is provided with
the inlet 110 and is securely affixed to a tube 104. The glass 100
is provided with a fastening rim 106 around its interior periphery.
A domed top 108 snaps onto the rim 106 to prevent the liquid from
spilling out of the glass 100. The tube 104 can be either
permanently or removably secured to the top 108, depending upon
preference. Further, the tube 104 can end simply as a tube or can
be provided with a shield as disclosed above. This embodiment
permits the user to most closely emulate using a regular cup or
glass. When manufactured from a clear material, the glass 100 can
be used in public without drawing attention to the user.
Additionally, the outer body 112 can be manufactured from a
ceramic, a handle added, and the device can be used as a coffee
mug.
[0065] In FIG. 11 the drinking glass 150 uses the tube 152 as both
the drinking apparatus and the valve. In the illustrated embodiment
the tube 152 is illustrated as L-shaped, however other
configurations can be used and will be evident. The tube 152, for
ease of description herein, is divided into the dispensing tube 156
and the valve 158, although the tube 152 is a single unit. The
valve 158 and dispensing tube 156 fill to the level of the liquid
within the glass 154. Once tipped, the open end 160 of the valve
158 no longer receives liquid, thereby preventing more liquid than
is contained within the tube 152 from being dispensed. The maximum
amount of liquid to be dispensed is controlled by the diameter of
the tube 152, length of the valve 158 and the predetermined fill
level. The predetermined fill level can be determined as noted
heretofore. The cup 150 is not illustrated with a top; however any
of the tops and sealing mechanisms previously disclosed can be
incorporated herein.
[0066] An alternative to the cup of FIG. 11 is illustrated in FIG.
18 wherein the dispensing cup 600 contains a tube/valve combination
602 that is retained within the vessel 608 through use of wall clip
606 and base clips 604. Although one wall clip and two base clips
are illustrated, this number can be varied in accordance with the
configuration of the vessel. The tube/valve combination 602
illustrated is flexible plastic tube that is dimensioned to
dispense a predetermined amount of liquid. In some instances, a
disposable flexible straw can be used, dependent on the
dimensioning of the cup and amount of liquid to be dispensed.
[0067] In FIG. 12 an alternate limited flow cup 200 is illustrated
incorporating several of the options and alternatives available.
The valve 202 is placed approximately in the center of the vessel
212, placing the tube 204 at an angle with the valve closer to
90.degree.. The valve 202 in this embodiment has a top and bottom
panel and is positioned within the vessel rather than next to the
base. The inlet 208 of the valve 202 has been moved to the opposite
side of the valve 202 than disclosed heretofore. Although this
valve arrangement does work, it requires angulating the cup to
almost an up side down position. The top 214 is provided with a
filler inlet 216 with a snap or other closure top 210. The filler
inlet 216 permits the vessel 212 to be repeatedly filled without
having to dislodge the tube 204 or valve 202. The shield 206 of
this embodiment is simply placed over the tube 204, using a
friction fit to maintain the shield 206 in place. The shield 206
will be unable, due to general construction, to come in sufficient
contact with the top 214 to prevent airflow between the shield 206
and the tube 204. Air holes can also be provided under the shield
if desired.
[0068] FIG. 13 illustrates a measured flow-dispensing device 300
that contains a valve 302 with an inlet 304. The dispensing hose
306 extends from the valve 302 out the side of the vessel 308. The
top 310 is removable to allow for the addition of water, etc., as
well as for mixing. One of the uses for the flow-dispensing device
300 would be fertilizing plants where a pre-measured amount of
fertilizer is applied to the plant. The bend of the dispensing hose
is not critical, as the container can be tipped to any dispensing
level needed to deliver the contents through gravity flow.
[0069] FIG. 14 illustrates an alternate embodiment of the limited
flow cup 350 wherein the measuring valve 360 is recessed within the
base 365 of the vessel 354. This instantiation guarantees that all
of the fluid in the cup 350 will be dispensed efficiently. The base
365 of the vessel 354 is sloped at an angle to facilitate the
collection of fluid in the measuring valve 360. The vessel 354 is
manufactured with a recessed valve-retaining flange 362 that is
dimensioned to receive the valve 360 in a friction fit. As with the
valve 14 of FIG. 1, the angle of the outlet is such to allow the
tube 356 to only be inserted at the predetermined angle. In this
embodiment, the valve inlet 368 has been moved to the top of the
measuring valve 360, adjacent the tube outlet. In embodiments where
the inlet 368 is on the top of the measuring valve 360, no fluid
will be dispensed once the level of the fluid drops below the
height of the valve. The angle on the base 365 of the vessel 354 is
sloped so that all fluid flows into the measuring valve 360,
ensuring that all of the liquid is dispensed.
[0070] The top 352 is provided with a fill port 358 that permits
the refilling of the vessel 354 without necessitating removal of
the top 352. The fill port 358 additionally serves as an air hole
to prevent a vacuum from being formed within the cup 350. In this
embodiment the tube 356 does not incorporate the air hole of as
illustrated in FIG. 1, although the air hole can be readily
included in this embodiment.
[0071] In the limited flow cup 700 of FIG. 19, the dispensing tube
hole is placed within the container 700. To prevent a user from
removing the fluid from the container 700 through suction, the
dispensing tube 702 is vented directly by a venting tube 704 that
leads from the dispensing tube 702 to the vent chamber 710. Air
holes 706 within the vent chamber 710 enable ambient air to enter
the dispensing tube 702 and prevent the vacuum. The air holes 706
enable airflow into the venting chamber 710, thereby preventing a
user from sucking up liquid from the cup. In this embodiment, the
shield can be eliminated, as there is no need to protect the tube
vent hole 704 from being blocked by a user.
[0072] In FIG. 20 the valved cup 770 is provided with a clip 772,
or other securing device, that maintains the dispensing tube 774 in
position. This embodiment eliminates the need for a lid to maintain
the dispensing tube 774 is position. Although this embodiment has
limited use, as a lid is required in many applications to prevent
spillage, the valved cup 770 can be used when small amounts of
liquid are dispensed. The use of clips 772 enables the dispensing
tubes 774 to be easily inserted and removed with only the valved
cup 770 requiring cleaning.
[0073] The foregoing are examples of the uses and configurations
for containers incorporating the limited flow valve. Other designs
and uses will be obvious to those skilled in the art. Additionally,
it will be apparent to those skilled in the art, that the valve
dimensions can be altered to allow for more or less liquid to be
dispensed.
[0074] The cup 10, as illustrated in FIGS. 1-4, is easily used as a
fill and ship unit that is filled by the manufacturer and shipped
to an end user. This is especially beneficial for hospitals and
nursing homes where the level to which the cup can be filled is
critical and attendant time is limited. The sealed units are also
advantageous for dispensing predetermined doses of medicine. When
manufactured as a disposable unit, the plastic can be lighter
weight than in the reusable units. Additionally, the valve within
the disposable units can be affixed to the units through either an
inert adhesive or manufactured as an integral part of the unit. The
diameter of the tube in the disposable units is also not as
critical as future cleaning is not an issue.
[0075] It is an advantage of the present invention that the limited
flow cup performs its metering function the first time that liquid
is dispensed, as well upon subsequent uses. It is a farther
advantage of the present invention that the limited flow cup
performs the metering function regardless of how the inner cup is
filled. In other words, it is an advantage of the present invention
that the limited function of the cup cannot be circumvented by
over-filling the inner cup, and that the amount of liquid that is
dispensed to the user never exceeds the maximum volume of the
metering components.
[0076] A first aspect of the fail-safe feature of the invention is
attained through volume limitations placed on the lower cup. In the
preferred embodiments, the cup is manufactured to only contain a
predetermined, thereby ensuring that the maximum capacity of the
cup is no greater than the desired total amount that is to be
dispensed. In this way, if it is safe for a patient to have 1/2cup
of liquid, the cup can only contain that amount. Filling the cup
with less will not generally harm a patient. A second aspect of the
fail safe aspect of the invention is the limited dispensing per
rotation that results due to the dimensioning of the cup, the
combination of the maximum fill level, valve orientation and the
dispensing conduit. This combination is such that when the
container is rotated toward a gravity dispensing position, the
valve inlet will be above the horizon of the liquid before
dispensing can commence. Thus, the cup cannot be placed in a
position that would enable the conduit to drain the container of
liquid prior to the valve inlet breaking the water line. Viewed
from another perspective, the liquid flow terminates after the cup
is moved from the horizontal and prior to the cup being rotated to
the dispensing position. Therefore, no more than the measured
volume of liquid from the valve liquid containing region can be
dispensed through the dispensing conduit to the user's mouth.
[0077] Because of the specific dimensioning of the cup and lid, the
use of the upper edge of the lower cup as the maximum fill line
does not negate the ability of the limited flow cup to dispense a
measured dose commencing with the first dose dispensed. The dome
effect of the lid provides a reservoir for liquid as the cup is
rotated to the dispensing position. The reservoir provided by the
lid enables the liquid to move away from the wall adjacent the
valve inlet, thereby enabling the inlet to break through the water
prior to dispensing.
[0078] This is in contrast with the cup construction as shown in
U.S. Pat. No. 5,810,210. The fill line 10 of FIG. 1 of the '210
patent is shown to correspond to the fill line 10 of FIG. 3. As can
be seen in FIG. 3, the cup 1 has been rotated to the dispensing
position wherein the inlet can still receive liquid. The '210 cup
can thus be overfilled, thereby losing its measuring capabilities.
Conversely, in the cup of the present invention, as illustrated for
example, in FIGS. 1 and 3, the cup cannot be filled above the upper
edge of the lower cup or vessel 22. Upon rotation of the cup to the
dispensing position, liquid is accommodated in the dome shaped lid
34, placing the liquid at a level below the point where the inlet
to the valve 14 breaks the surface level of the liquid prior to the
conduit reaching the dispensing position.
[0079] This can be accomplished by making the cover 34 tall,
relative to the height of the cup 22, as shown in the figures. The
height of the cover 34 provides a relatively large inherently open
volume or "headspace". This headspace allows the liquid to be
displaced within the cup as shown in FIG. 21 when the cup is
tilted. In use, the cup is tilted until the water level 17 is below
the inlet 15 to the valve 14. It is in this position that the
"headspace" or "dome" region of the cup provides an area for
liquid. In the absence of the dome, the cup would have to be used
with less liquid. Viewed from another perspective, the liquid level
is higher for a given volume of liquid, in the absence of a dome
region. For the preferred embodiment, the cover geometry provides a
volume of headspace generally in the range of about 28% to 40% of
the volume of the inner cup.
[0080] The total headspace volume required to satisfy both safety
conditions, having a maximum fill point and controlled dispensing,
will depend upon the geometry of the cover in combination with the
volume of the cup. In order to more clearly explain this, reference
is made to an imaginary modified interior triangle 19 formed by the
exit point of the conduit, the wall directly below the exit point,
the floor and the valve. It should be noted that this triangle is
for description purposes only in relation to the flow of the liquid
and in no way creates any design or dimensioning limitations. The
total lid volume required will be less if the cup volume within the
interior triangle 19 is increased through use of a squat cup having
a larger footprint. If, however, the cup height is increased and
the footprint made smaller, the total lid volume must be increased
to compensate for the decreased volume within the interior triangle
19. In order to ensure that the controlled amount is dispensed upon
the initial rotation, it is important that the total volume of
headspace be designed to place a sufficient amount of liquid into
the interior triangle 19 when the cup is tilted. The combination
cup and lid design must ensure that the level of the liquid will
never be above line 19 when the cup is tilted to the dispensing
angle. This can only be accomplished by providing space within the
lid for additional liquid displacement. It should be noted that
space beyond the required amount will not cause any problems,
however insufficient space will not permit the inlet 15 to clear
the liquid line 17 prior to the cup reaching the dispensing
position.
[0081] Preferably, the amount of liquid dispensed to the user is
approximately the same whether the inner cup is 10% full or 100%
full. Advantageously, the amount of liquid dispensed to the user
does not vary by more than 25% from the initial dispensing to the
dispensing of a requisite quantity liquid. By having the dispensing
conduit volume no greater than 25% of the total volume of the
dispensing conduit volume plus the metering valve volume, a
relatively uniform dispensing of liquid is attained.
[0082] The foregoing are examples of the uses and configurations
for containers incorporating the limited flow valve. Other designs
and uses will be obvious to those skilled in the art. Additionally,
it will be apparent to those skilled in the art, that the valve
dimensions can be altered to allow for more or less liquid to be
dispensed.
* * * * *