Hydraulic vibrator

Details Hydraulic vibrator Hydraulic vibrator

1977-06-06

1978-08-15

Moskowitz, Nelson

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

73665, 92 136, G01V 114, G01V 104

Patent

active

041065867

ABSTRACT:
The present invention relates to an improved hydraulic vibrator of the type which includes a fixed double rod piston and a reaction mass reciprocally disposed around the piston forming a hydraulic cylinder therein so that when hydraulic fluid is introduced to the cylinder relative to the piston the reaction mass is reciprocated. By the present invention a pair of sleeves are slidably disposed on the piston rods, portions of which can be selectively moved into the cylinder to decrease the displacement of the cylinder and thereby increase the frequency range of vibrations producible by the vibrator.

REFERENCES:
patent: 356538 (1887-01-01), Hubner
patent: 2478790 (1949-08-01), Stephens
patent: 2596471 (1952-05-01), Densmore et al.
patent: 3287696 (1966-11-01), Cholet et al.
patent: 3731592 (1973-05-01), Kreiskorte
patent: 3866709 (1975-02-01), Mifsud
patent: 4046623 (1977-09-01), Schmid

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