U.S. patent number RE35,412 [Application Number 08/296,438] was granted by the patent office on 1996-12-31 for double tank pinch trigger pump water gun.
This patent grant is currently assigned to Larami Limited. Invention is credited to Bruce M. D'Andrade, Lonnie G. Johnson.
United States Patent |
RE35,412 |
Johnson , et al. |
December 31, 1996 |
Double tank pinch trigger pump water gun
Abstract
The present invention is directed toward a toy water gun which
is operated by selectively releasing water from a water reservoir
pressurized with air. The present invention has a manually operated
pump incorporated into the design. As the pump is cycled, water and
air is drawn from a water storage tank. Once drawn, the water and
air are forced into a pressure reservoir. As the amount of water
and air forced into the pressure reservoir increases, the pressure
on the water within the pressure reservoir increases. The pressure
of the water and air within the pressure reservoir increases with
each cycle of the pump, until the pump can no longer overcome the
pressure of the water and air within the pressure tank. The
pressurized water and air within the pressure tank has an avenue of
release that is regulated by the trigger mechanism of the
invention. When no force is applied to the trigger, the pressurized
water and air are held at bay with no means of release. When force
is applied to the trigger, the water is first released from the
pressurized container and is channeled through a narrow nozzle. The
escape of the water, under pressure, through the narrow nozzle
creates a stream of propelled water that lasts as long as the
trigger is engaged or until the air pressure propelling the water
equals the ambient pressure.
Inventors: |
Johnson; Lonnie G. (Smyrna,
GA), D'Andrade; Bruce M. (Whitehouse Station, NJ) |
Assignee: |
Larami Limited (Mt. Laurel,
NJ)
|
Family
ID: |
27077439 |
Appl.
No.: |
08/296,438 |
Filed: |
August 26, 1994 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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680247 |
Apr 3, 1991 |
|
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578145 |
Sep 6, 1990 |
5074437 |
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Reissue of: |
841762 |
Feb 28, 1992 |
05150819 |
Sep 29, 1992 |
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Current U.S.
Class: |
222/79;
222/400.8; 222/401; 273/349; 42/54; 446/473 |
Current CPC
Class: |
B05B
9/0426 (20130101); B05B 9/0805 (20130101); B05B
9/0816 (20130101); B05B 9/0894 (20130101); F41B
9/0018 (20130101); F41B 9/0028 (20130101); F41B
9/0068 (20130101) |
Current International
Class: |
B05B
9/08 (20060101); B05B 9/04 (20060101); F41B
9/00 (20060101); A63H 003/18 () |
Field of
Search: |
;222/79,130,325,396,400.7,400.8,401 ;42/54 ;446/473 ;273/349
;124/70,73 ;239/99 ;141/25 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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431955 |
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Jul 1935 |
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GB |
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669983 |
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Apr 1952 |
|
GB |
|
Primary Examiner: Huson; Gregory L.
Attorney, Agent or Firm: Kennedy & Kennedy
Parent Case Text
REFERENCE TO RELATED CASE
This application is a continuation of U.S. Ser. No. 07/680,247
filed Apr. 3, 1991 now abandoned, which is a continuation-in-part
of copending U.S patent application Ser. No. 07/578 145, filed on
Sep. 06, 1990 now U.S. Pat. No. 5,074,437 by Bruce M. D'Andrade and
Lonnie Johnson, inventors, entitled "Pinch Trigger Pump Water Gun".
Claims
What is claimed is:
1. A toy water gun having a housing with extending handle trigger
and barrel, said water gun comprising:
(a) a water storage reservoir connected to said housing, said water
storage reservoir having at least one orifice formed thereon for
the addition and subtraction of water therefrom; and said water
storage reservoir having at least one vent to the surrounding
ambient air;
(b) a pressurized water storage tank connected to said housing,
said pressurized water storage tank having only one orifice through
which all liquids and gasses pass;
(c) a pumping means that can selectively draw air or water or a
combination thereof from said vented water storage reservoir,
depositing same into said pressurized water storage tank to thus
vary the ratio of air to water therein;
(d) a plurality of one-way flow valves, wherein at least one of
said one-way flow valves prohibits water and air from flowing from
said pressurized water storage tank to said pumping means and
another at least one of said one-way flow valves prohibits water
and air from flowing from said pumping means to said water storage
reservoir;
(e) a nozzle having a narrow orifice therethrough, said nozzle
being affixed to the end of said barrel;
(f) an avenue of release connecting said nozzle to said pressurized
water storage tank; and
(g) a controlling means for regulating the flow of water and air
through said avenue of release, said controlling means being
attached to said trigger of said water gun and regulated by the
movement of said trigger.
2. The water gun of claim 1, whereto a one-way venting valve allows
ambient air to enter said water storage reservoir through said vent
while preventing water from exiting said water storage reservoir
through said vent.
3. The water gun of claim 1, wherein said pumping means is the
reciprocation of a piston within a cylinder, said reciprocation of
said piston having two-cycle strokes, a priming stroke whereto said
piston retreats within said shaft, and a compression stroke wherein
said piston advances within said shaft.
4. The water gun of claim 3 wherein said piston is affixed to a
rod, said rod terminating at a handle.
5. The water gun of claim 3 wherein said priming stroke of said
pumping means draws water or air into said cylinder from said water
storage reservoir, past at least one said one-way flow valves.
6. The water gun of claim 5 wherein said compression stroke of said
pumping means forces said water or said air, drawn from said water
storage reservoir, out of said cylinder and into said pressurized
water storage tank.
7. The water gun of claim 4 wherein said handle is slidably affixed
to said barrel.
8. The water gun of claim 1 wherein said avenue of release is a
flexible tube.
9. The water gun of claim 1 wherein the level and orientation of
water within said water storage reservoir determines whether said
pumping means draws water or air from within said water storage
reservoir.
10. The water gun of claim 9 wherein a user of said gun can
selectively draw air or water from said water storage reservoir
with said pumping means by changing the orientation of said
gun.
11. The water gun of claim 8 wherein said controlling means for
regulating the flow of water through said avenue of release is a
spring biased pinch bar that presses a length of said avenue of
release against said housing of said water gun, collapsing said
length of said avenue of release.
12. The water gun of claim 11 wherein said spring bias of said
pinch bar is overcome by a force applied to said trigger, whereby
said pinch bar is formed as part of said trigger and said force
applied to said trigger through a lever action, causes said pinch
bar to move in opposition of said spring bias.
13. The water gun of claim 1 wherein said water storage reservoir
is detachable from said gun.
14. The water gun of claim 11 wherein said spring bias is created
by a leaf spring having one end affixed to said housing of said
gun.
15. The water gun of claim 2 wherein said one-way venting valve
opens each time the air pressure within said water storage
reservoir is less than that of the ambient air.
16. The water gun of claim 1 wherein said pressurized storage tank
can safely hold water or air at a pressure of at least one hundred
pounds per square inch.
17. The water gun of claim 1 wherein said water storage reservoir
has a sealable orifice thereon for the addition of water
thereto.
18. The water gun of claim 13 wherein water stored within said
pressurized water storage tank can be discharged from said gun
while said water storage reservoir is detached from said gun.
19. The water gun of claim 11 wherein said spring bias pinch bar is
calibrated to yield to pressure within said avenue of release, when
said pressure within said avenue of release exceeds a predetermined
maximum value. .Iadd.20. A toy water gun comprising a storage
reservoir adapted to hold water and air, said storage reservoir
having a vent which allows air to enter said water storage
reservoir; a pressure tank adapted to hold water and air; first
conduit means for conveying water or air from said storage
reservoir to said pressure tank, said first conduit means being
coupled with said storage reservoir in a position so that the
orientation of water within the storage reservoir determines
whether water or air is drawn from within said storage reservoir;
drawing means for selectively drawing air or water or a combination
of air and water from said storage reservoir and depositing the
drawn air or water or combination thereof into said pressure tank
through said first conduit means; second conduit means for
conveying water from said pressure tank to ambience; and control
means for controlling the flow of water through said second conduit
means. .Iaddend..Iadd.21. The toy water gun of claim 20 wherein
said drawing means comprises a pump. .Iaddend..Iadd.22. The toy
water gun of claim 20 wherein said second conduit means includes a
nozzle. .Iaddend..Iadd.23. A toy water gun comprising a housing; a
storage reservoir adapted to hold a combination of water and air,
said storage reservoir being removably mounted to said housing; a
pressure tank adapted to hold a combination of water and air; first
conduit means for conveying water or air from said storage
reservoir to said pressure tank; pump means for selectively pumping
water or air into said pressure tank from said storage reservoir to
vary the air to water ratio therein and thereby increase pressure
of air exerted upon the water by compression of the air; second
conduit means for conveying water from said pressure tank to
ambience, and control means for controlling the flow of water
through said second conduit means. .Iaddend..Iadd.24. The toy water
gun of claim 23 wherein said water storage reservoir has a vent
which allows air to enter said water storage reservoir from
ambience. .Iaddend..Iadd.25. The toy water gun of claim 23 wherein
said second conduit means includes a nozzle. .Iadd.26. The toy
water gun of claim 23 wherein said first conduit means is coupled
with said storage reservoir in a position so that the orientation
of water within said storage reservoir determines whether said
pumping means draws water or air from within said storage
reservoir. .Iaddend.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is directed toward a toy water squirt gun,
and more particularly to such toy water squirt guns that use a
self-contained pumping means to draw water from a storage
reservoir, compress an air cushion with the drawn water, and store
the water pressurized by the compressed air in a second pressurized
reservoir. The water is then released in a selective manner through
a narrow nozzle, causing the stored water to be propelled forward
in a narrow stream. 2. Prior Art Statement
Water guns have for decades been a very popular child's toy. Since
the toy industry is very competitive, hundreds of different style
water guns have been developed in an attempt to profit from the
toy's inherent popularity. The most traditional forms of water guns
are activated by a pumping action, either manually through the
trigger or automatically through a battery operated motor. Such
pump action water guns work, but the guns are limited in the
distance the water traveled, the amount of water projected and the
duration of the pumping cycle. In an attempt to improve upon water
guns, the toy industry has developed pressure activated water guns.
Such pressure water guns work upon the principle of pressure
differentials between the water held within the toy and the
atmosphere. The water within the toy is held at a pressure higher
than that of the ambient air. As a result, when the water within
the toy is given an avenue of escape, the water will stream out
under the pressure. Prior art that shows pressure differential
types of water guns are exemplified by the following:
U.S. Pat. No. 3,197,070 to Curtis F. Pearl et at, shows a water gun
activated by trapping water in a collapsible area. As the device is
collapsed, the pressure of the water builds, spraying the water out
of the one small orifice left within the pressured volume. Once the
confined volume is fully collapsed, the reexpansion of the volume
draws forth more water from a reservoir, thus priming the water gun
for another cycle. The water being pressurized is limited to the
volume of the collapsible volume. The Pearl invention cannot store
pressurized water for use at a later time, nor can the pressure of
the water be increased by cycling the pumping action of the
invention while restraining water discharge.
U.S. Pat. No. 4,854,480 to Robert S. Shindo and U.S. Pat. No.
4,735,239 to Michael E. Salmon et al, both show toy water devices
that use an elastic bladder to pressurize water. The bladders are
filled with high pressure water, and the bladders respond by
elastically deforming. The source of pressurized water is then
removed and the water within the expanded bladder is held in place
by a clamping device activated by a trigger. The water gun is used
by selectively releasing the water from the expanded bladder.
Water guns have also been developed that use air pressure to
pressurize water and force water through squirt channels. Such toys
that use air pumps to pressurize water are exemplified by the
following:
U.S. Pat. No. 4,214,674 to Jones el al, shows a two piece apparatus
consisting of a pressurized water reservoir and a discharging gun.
Air is introduced into the water reservoir via a hand operated
pump. The air pressurizes the water, forcing it up through the
discharging gun, where the rate of discharge can be regulated by a
trigger.
Thus, although prior art does show toy water guns that have
collapsible water chambers and self-contained pumping means, prior
art neither teaches nor suggests a toy water gun that uses a
self-contained water pumping device to draw both water and air from
a storage reservoir, pressurize air with the water drawn, and store
the pressurized air and water in a second pressurized reservoir,
where it can accumulate until discharged. Additionally, the safety
of the invention is assured by a triggering device that
automatically and safely discharges pressurized water when over
pressurized, until the maximum allowable pressure is reached.
SUMMARY OF THE INVENTION
The present invention is directed toward a toy water gun which is
operated by selectively releasing water from a pressurized water
reservoir. The present invention has a manually operated pump
incorporated into the design. As the pump is cycled, water and air
is drawn from a water storage tank. Once drawn, the water and air
are forced into a second pressure reservoir. As the amount of water
and air forced into the pressure reservoir increases, the pressure
of the air displaced by the water within the pressure reservoir
increases. The pressure of the air and water within the pressure
reservoir increases with each cycle of the pump, until the pump can
no longer overcome the pressure of the air and water within the
pressure tank. The pressurized air and water within the pressure
tank has an avenue of release that is regulated by the trigger
mechanism of the invention which has a safety pressure release
within its design. When no force is applied to the trigger, the
pressurized water and air are held at bay with no means of release.
When force is applied to the trigger, the heavier water is first
released from the bottom of the pressurized container and is
channeled through a narrow nozzle. The escape of the pressurized
water through the narrow nozzle creates a stream of propelled water
that lasts as long as the trigger is engaged or until the pressure
within the pressurized container equals the ambient air
pressure.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be more fully understood by referring to the
following detailed specifications, the above specification and the
claims set forth herein, when taken in connection with the drawings
appended hereto, wherein:
FIG. 1 shows a perspective view of one preferred embodiment to the
present invention; and
FIG. 2 shows a partially fragmented side view of the embodiment
depicted in FIG. 1, illustrating the claimed inner mechanisms.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
The present invention is, as mentioned, directed toward a toy water
gun that uses a manually operated pump to draw and pressurize water
and air, storing the water and air under pressure until selectively
discharged. The science of pressurized water toys is not new, and
over the years many different designs have been developed utilizing
a pumping action to pressurize water. As applied to the art of toy
water squirt guns, the most common type of device involves a
two-stroke pump, wherein the pump draws water into a chamber
through a large orifice during the priming stroke, and forces water
out of the chamber through a very narrow orifice during compression
stroke. This simple system forms the basis of thousands of devices
in addition to water guns, such as non-aerosol dispensing devices
for hair spray, perfume, window cleaner, and countless other
products that are dispensed in a narrow stream or mist.
The problem with simple two-stroke squirting systems is that the
amount of fluid that can be expelled is limited to the volume of
the compressible area; also, the pressure of the liquid exiting the
device is dependent directly upon the force being applied during
the time of expulsion. Consequently, when water is squirted in this
manner, only a small volume is released with each pumping action.
When attempts are made to increase the amount of water propelled by
increasing the volume of the compressible area, the pumping action
cannot displace the water at a high pressure, resulting in
expulsion of water at low pressures.
Water guns need the characteristics of squirting a large volume of
water at high pressures. The higher the pressure, the longer the
distance the water can be propelled, thus increasing the range and
power of the water gun. The present invention water gun uses a
common two-stroke pump to store and pressurize large amounts of
water. The present invention draws predetermined volumes of water
and air from a storage container, pressurizes air with the drawn
water and deposits the pressurized air and water in a second
storage tank, where it remains under pressure. As more and more
water and air are drawn, pressurized and deposited within the
second storage container, the volume and the pressure of the stored
water increases, compressing the air within the second container.
The water propelled by the compressed air can then be selectively
released through a narrow orifice, creating a stream of propelled
water. The double tank system of the present invention allows the
user of the invention to determine the volume and pressure of the
water to be discharged, and also allows a user to refill and
replace the non-pressurized water storage tank without disabling
the water gun's ability to discharge water. The double tank system
gives water guns a variety of firing characteristics that is unique
in the art of toy water guns, allowing an operator to choose and
adjust the range and power of the water gun.
The present invention also has other advantages over other
pressurized container water guns, in that, instead of pumping only
air into a chamber that already contains water, the present
invention pumps water into a chamber which is filled with air. The
pumping of water is more efficient than the pumping of air, thus
less pumping strokes are required and higher pressures are easier
to achieve.
When designing toys involving pressurized air and water, the
problem becomes one of safety. Toys are designed to be inexpensive
so as to be widely marketable. As such, most toys are made of
plastics or other inexpensive materials. Such materials do not have
large tensile strengths or fatigue characteristics, and therefore
do not lend themselves well to containing pressurized fluids.
Plastic containments of pressurized liquids, if not properly
designed, can rupture and explode, causing injury. The present
invention has a unique design that allows for both the use of high
pressure air and the elimination of potential rupturing hazards.
The present invention has a cylindrical pressurized reservoir with
a single opening. The single orifice, in conjunction with the
generous radii used at the cylinder ends, serve to maintain the
integrity of the water reservoir walls and minimize the stress
points throughout the material of the pressurized reservoir,
thereby allowing for the safe use of pressures generated by the
present invention. Referring now to FIGS. 1 and 2, one preferred
embodiment of the present invention 1 is shown. FIG. 1 shows a
perspective view of the present invention 1 and FIG. 2 shows a
fragmented side view of the present invention, exposing the
internal mechanisms with like parts being like numbered. As shown
from FIGS. 1 and 2, the embodiment shown of the present invention
has two tanks, a water storage tank 38 and a pressurized tank 3.
Both tanks 38, 3 attach to a main housing 60 that is shaped
generally in the form of a gun having a handle 95, trigger 65 and
barrel 81. The water storage tank 38 is held firmly to the housing
60 with a hoop 37. The hoop 37 minimizes the stresses on the
tapered neck of the storage tank 38 as the water 69 within shifts
during movement.
Referring now solely to FIG. 2, the inner workings of the present
invention 1 can best be visualized and explained. Water 69 is
placed within water storage tank 38. The water 69 is introduced in
one of two ways. First, the water 69 can be poured through the
optional filling cap 83, or the water storage tank 38 can be
removed from the housing 60 and water can be poured through the
neck opening of the storage tank 38. The water storage tank 38 is
shown in FIG. 2 as being bottle shaped, with a neck terminating in
a threaded head 28. The storage tank 38, in the shown embodiment,
screws into the housing 60. However, it should be understood that
the storage tank 38 can be formed unistructurally with the housing
60, and if so formed, the optional filling cap 83 would become a
necessary part of the design. It should also be understood that the
storage tank 38 can be formed in any shape or size, as long as the
design holds and stores water.
Water 63 and air 35 are drawn from the storage tank 38 through an
orifice 29 that connects with the storage tank 38. The invention
will draw either water 63 or air 35 from the storage tank 38,
depending on the orientation of the invention when the operator
draws materials from the storage tank 38. As water 69 or air 35 are
taken from the storage tank 38, a partial vacuum is produced
within. The vacuum is eliminated by a vent valve 19 that allows air
35 to enter into the storage container 38 as the vacuum develops.
The vent valve 19 is biased by a spring 9 in the closed position,
preventing water from escaping, and an optional elastomeric washer
7 helps seat the vent valve 19, enhancing its ability to prevent
the escape of water. It should be understood that although a vent
valve 19 is the best mode of the invention. the invention may
function without such a valve so long as the storage container has
an open vent to the ambient air. Similarly, an elastomeric seal 25
can be used to help seat the water storage tank 38 against the
housing 60, the elastomeric seal having an orifice therethrough,
allowing for the passage of the draw tube 29 and the vacuum venting
passage 21.
The force drawing the water 69 or air 35 from the storage tank 38
is created by the movement of the piston 33 within its cylinder 34.
The movement of the piston 33 within the cylinder 34 has two-cycle
strokes, a priming stroke where water 69 or air 35 are drawn forth
from the water storage reservoir 38, and a compression stroke
wherein water 69 or air 35 are displaced by the piston 33. The
priming stroke starts when the piston 33 is retreated within its
cylinder 34, creating a large volume chamber 15. The vacuum created
by the expanding chamber 15, draws water 69 or air 35 through the
draw tube 29 and into the chamber 15. The flow of water 69 or air
35 into the expanding chamber 15 opens a one-way valve that is
normally biased in a closed position. The one-way valve that is
shown in FIG. 2 consists of a ball 30 that is biased against an
elastomeric seal 11 by a spring 13. As a vacuum is created by the
piston 33, the force of the spring 13 is overcome and the ball 30)
drops away from the elastomenc seal 11, allowing water 69 or air 35
to pass. As the piston 33 is advanced within its cylinder 34, the
compression stroke begins and water 69 or air 35 now within the
chamber is compressed, closing the one-way valve by assisting the
spring 13 to push the ball 30 against its seal 11. Although a ball
and seal one-way valve is illustrated, it should be understood that
any design of a one-way valve would work within the present
invention as long as the valve made a seal that is both air and
water tight.
The compression stroke created by the advancement of the piston 33
within the cylinder 34 causes the water 69 or air within the
chamber 15 to become pressurized. The water 69 or air 35, as a
result of the diminishing volume of the chamber 15, opens a second
one-way valve that leads to the pressurized storage tank 3. As the
piston 33 is reciprocated within its cylinder 34, water 69 or air
35 is repeatedly drawn from the storage tank 38 and deposited into
the pressurized storage tank 3. As more and more water 69 or air 35
is drawn and forced into the pressurized storage tank 3, the
pressure with tank 3 increases until the force used to drive the
piston 33 can no longer overcome the stored pressures, or until the
pressure is released through the safety trigger 65.
The movement of the piston 33 within cylinder 34 draws water 69 or
air 35 from storage tank 38 through an orifice 29. However, when
the storage tank 34 is positioned so that the air 35 within the
storage tank 38 is in contact with the orifice 29, the movement of
the piston 33 will draw air 35 into the pumping chamber 15. When
the pumping chamber 15 is compressed, the air 35 will become
pressurized and flow into the pressurized storage tank 3, forming
an air cushion, while not increasing the pressure of any water 91
present within the pressurized storage tank 3. By having a pumping
action that can introduce both air 92 and water 91 into the
pressurized storage tank 3, the pressure of the air 35 can be
increased above that available by an air pumping system alone
because of the inefficiency of a normal hand pump. The pumping of
water 91 is more efficient than that of air 92 because of the
incompressibility of liquids, therefore the work available from the
pumping system is maximized when used to pump water against an air
cushion.
The operation of the pumping action is achieved by the piston 33
being driven by a piston rod 31 that is affixed to a handle 73. The
handle 73, as shown in this embodiment, is slidably attached to the
barrel 81. As the handle 73 is manually reciprocated along the
barrel 81, the motion is transferred to the piston 33, creating the
desired pumping effect. Although a linear pumping action is shown,
it should be understood that a variety of orientations and multiple
linkage configurations could be manipulated by a user to create the
desired pumping motion.
Once the desired pressure is obtained within the pressurized tank
3, the water 91 stressed by the compressed air 92, is discharged by
selectively opening an exit orifice to the surrounding ambient air.
The pressure differential between the ambient air and the water 91
causes the water 91 to stream out. In the shown embodiment of the
present invention, the pathway connecting the pressurized tank 3 to
the ambient air is a pair of tubes, a flexible exit tube 67 and a
pump connection tube 47. As water or air leaves the pumping chamber
15, it passes by a one-way valve 43 and into a T-shaped connection
53. The T-shaped connection 53 on one side attaches to the flexible
exit tube 67, and on the other side attaches to connection tube 47.
As water or air is forced into the T-shaped connection 53, the
water or air tries to enter both the exit tube 67 and the
connection tube 47. However, the exit tube 67 is closed by the
trigger pinch bar 63, leaving the connection tube 47 as the only
pathway through which the water may pass. The connection tube 47
leads to the pressure tank 3, consequently all or air water
expelled by the pump is led into the pressure tank 3. When
pressurized water 91, stored within the pressure tank 3 is to be
discharged, the trigger 65 is depressed. The trigger 65 is formed
with a pinch bar 63 that is biased against the exit tube 67 by a
spring 57. As the trigger 65 is depressed, the bias of the spring
57 is overcome and the pinch bar 63 is lifted away from the exit
tube 67. With the exit tube 67 open, the integrity of the pressure
tank 3 is now breached and the pressurized water 91 is offered an
avenue of escape to the ambient air. The pressure differential
between the pressurized water 91 and the ambient air causes the
water 91 to flow back out through the connection tube 47, through
the T-shaped connection 53 and through the exit tube 67, until the
water 91 is discharged through the exit orifice 75 formed at the
end of the exit tube 67.
The amount of pressurized water 91 being discharged through exit
orifice 75 is controlled by the user in a variety of ways. A user
can control the amount of water discharged by controlling the
depression of the trigger 65. If the trigger 65 is depressed and
left in that position, the pressurized water 91 will be discharged
until the pressure tank 3 is empty, or until the pressure of the
compressed air 92 equals that of the ambient air. The user may
choose to discharge the pressurized water 91 selectively,
depressing the trigger 65 for short periods of time, resulting in
numerous shots being allowed before the pressure tank 3 needs to be
refilled. A user may also choose to vary the pressure and amount of
water being discharged by selectively adding the air 92 within
pressure tank 3. The more water 91 or air 92 is added, the higher
the pressure and the farther and longer the invention may propel
water.
As mentioned, the present invention water gun is operated by
selectively releasing the pressurized water 91 through a narrow
nozzle 75. The selective release of the pressurized water is
controlled by the trigger mechanism of the water gun. Since the
present invention has the ability to operate at high pressures, the
trigger release mechanism performs two functions. First, it
controls the amount of water released, and second, the trigger
mechanism serves as a safety valve. The trigger 65 of the present
invention has a pinch bar extension 63 that pinches the exit hosing
67 for the pressurized water 91 against a stop 59 that is part of
the main housing.
The pinch bar 63 is biased against the stop 59 by a calibrated
spring 57. The spring 57 is held at one end by a formation 55 of
the main housing. The strength of the spring 57 in its biased
configuration is calibrated, so that when the pressure of water 91
within the exit tubing 67 reaches a predetermined maximum valve,
the spring 57 will allow the pinch bar 63 to rise and water 67 will
be released until a safe pressure is maintained.
FIGS. 1 and 2 show only one embodiment of the present invention,
and although these figures show the best mode of the invention, it
should be understood that the present invention can be practiced in
many forms other than that shown. The basis of the present
invention is a double tank design that uses a manual water pump and
a series of one-way valves and tubes to draw ambient water from one
tank, pumping said water into a second tank, where it is
presssurized against an air cushion and discharge that water
selectively to the ambient air. The illustrated embodiment shown in
FIGS. 1 and 2 shows a design for the present invention that is both
efficient and inexpensive to manufacture. It should therefore be
understood that in light of the appended claims, the invention may
be practiced other than is specifically described, and individual
parts may be modified or connected in orientations other than those
shown.
* * * * *