Motors: expansible chamber type – Independently operated timer – delay – pattern or cyclic control – Independent distributor actuation for cyclic control
Patent
1982-01-25
1984-04-17
Garrett, Robert E.
Motors: expansible chamber type
Independently operated timer, delay, pattern or cyclic control
Independent distributor actuation for cyclic control
91364, 13762521, 13762413, F15B 2102
Patent
active
044427557
ABSTRACT:
A power stage servo valve for a seismic vibrator includes a stationary orifice plate defining a plurality of valve ports having a first shape. A rotary orifice plate, abutting the stationary orifice plate, defines a like plurality of valve ports that have a shape different from the valve ports in the stationary orifice plate. The configuration and shape of the rotary valve ports is such that the valve opens more quickly than it shuts off when the plate is rotating continuously in one direction at a desired angular velocity.
REFERENCES:
patent: 523077 (1894-07-01), Loss
patent: 1141218 (1915-06-01), Sparks
patent: 3552891 (1971-01-01), Woodling
patent: 3696710 (1972-10-01), Ortelli
patent: 3720136 (1973-03-01), Uchida et al.
patent: 3745885 (1973-07-01), Fair et al.
patent: 3941154 (1976-03-01), Bishop
patent: 4308924 (1982-01-01), Boguth
Garrett Robert E.
Knox William A.
Li H.
Litton Resources Systems, Inc.
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