Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1995-07-14
1997-07-08
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
181115, 181120, H04R 2300
Patent
active
056469098
ABSTRACT:
A pneumatic gun having a fast-acting sliding sleeve valve member reciprocating between two axial positions, first to open an exhaust port for the explosive release of gas from a pressurized charge chamber in a stationary housing while simultaneously closing a pressurized intake port to said chamber, and then to close said exhaust port while simultaneously opening said pressurized intake port for recharging said charge chamber, all for the purpose of generating repetitive trains of impulsive sounds at a rapid rate with increased efficiency. The sliding valve member comprises a sleeve and may include a piston in a cylinder within the housing. The sliding valve member has a sealing flange which forms a lip seal with a stationary annular mating surface of the gun to close an exhaust port. A wall of the charge chamber is provided with an intake port in communication with a source of high-pressure gas. The intake port is closed when the exhaust port is opened by the sliding action of the sleeve valve member, and is opened when the lip seal is formed to close the exhaust port. The sleeve is fitted with an annular cocking flange which is disposed in a cocking chamber supplied with high-pressure gas which exerts a continuous closing force against the cocking flange to form and maintain the lip seal except for those periods when the gun is actuated. A portion of one of the mating surfaces forming the lip seal is relieved to provide an activating chamber. High-pressure gas is provided selectively to the activating chamber generating in the activating chamber an opening force against the sealing flange, which force is larger than the closing force exerted against the cocking flange, thereby breaking the lip seal and permitting gas to acceleratively discharge from the charge chamber. In the piston embodiment, the acoustic output of the gun includes not only the explosive acceleration of gas from the exhaust port, but also the abrupt volume acceleration off the face of the piston.
REFERENCES:
patent: 4623033 (1986-11-01), Harrison, Jr.
patent: 4825973 (1989-05-01), Harrison
patent: 5001679 (1991-03-01), Harrison
patent: 5228010 (1993-07-01), Harrison
patent: 5315917 (1994-05-01), Mayzes
patent: 5365493 (1994-11-01), Harrison
A New Generation Air Gun, E. R. (Harry) Harrison and L. M. Glacoma, Dec., 1994.
Eldred J. Woodrow
Hyroacoustics Inc.
Lukacher M.
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