Appeal No. 2000-1327
Application No. 08/402,624
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.
Thus, the mechanism for expelling water out the exit orifice
of the water gun of Johnson is the air trapped and compressed in
the pressure reservoir 3 as water and air are introduced into the
pressure reservoir during the pumping operation.
The present invention differs from the prior art Johnson
device in the way it expels water from the gun. More
specifically, the present device employs “an expandable pressure
tank adapted to hold liquid and to expand upon depositing liquid
therein so as to exert a force upon the liquid” (specification,
page 3; emphasis added). As explained in the paragraph spanning
pages 5 and 6 of appellant’s specification:
To release the pressurized water from the gun the
trigger 17 is manually pulled to overcome the biasing
force exerted by spring 48 upon pinch bar 47. Movement
of pinch bar 47 from delivery tube 45 causes the
pressurized water within tube 41, delivery tube 45 and
pressure tank bladder 30 to be released as a stream
from nozzle 21. The bladder contracts with expulsion
of water therefrom but maintains a pressure upon the
water until the bladder reaches a relaxed
configuration.
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