Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1976-11-11
1978-07-18
Birmiel, Howard A.
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181114, 181118, 340 155SW, G01V 110
Patent
active
041009916
ABSTRACT:
Within a stationary upstanding cylindrical housing, a piston and a base member resting on the ground are separated by an expansible detonation chamber. Means are provided for feeding successive charges of a combustible gas mixture into the chamber at a rapid rate and initiating a corresponding series of gas explosions therein. Recoil of the piston following each explosion compresses a first air spring which then forcibly thrusts the piston downwardly. Piston recovery for the next cyclic operation is thereafter slowed by means of a second air spring-dashpot combination.
REFERENCES:
patent: 3198282 (1965-08-01), Dunaway
patent: 3958661 (1976-05-01), Dransfield et al.
patent: 3981379 (1976-09-01), Sayous
Atlantic Richfield Company
Betz Robert M.
Birmiel Howard A.
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