Variable frequency control for percussion actuator

Details Variable frequency control for percussion actuator Variable frequency control for percussion actuator

1990-09-26

1991-06-11

Ostrager, Allen M.

Motors: expansible chamber type

Cyclically operable

Working member controlled motive fluid for distributor motor

91284, 91300, 91319, 91335, 173134, F01L 2502

Patent

active

050223097

ABSTRACT:
A variable frequency control for a hydraulic percussion actuator includes a piston bore and a valve bore. A piston is axially disposed within the piston bore, while a valve is axially disposed within the valve bore. A first piston biasing member biases the piston in a first direction while a second piston biasing member, which overcomes the bias of the first piston biasing member to move the piston in a second direction. A first valve biasing pin biases the valve in a third direction while a second valve biasing pin overcomes the bias of the first valve biasing pin to move the valve in a fourth direction. A hydraulic valve actuator displaces the second valve biasing pin when the piston is extended in the second direction, and a piston actuator activates the second piston biasing pin when the valve is extended in the fourth direction. A valve response member controls the time required for the valve to be displaced in said fourth direction upon actuation of said valve actuating member.

REFERENCES:
patent: 217952 (1879-07-01), Neff
patent: 806128 (1905-12-01), Flottmann
patent: 3741072 (1973-06-01), Romell et al.
patent: 3995700 (1976-12-01), Mayer et al.
patent: 4077304 (1978-03-01), Bouyoucos
patent: 4143585 (1979-03-01), Selsam
patent: 4172411 (1979-10-01), Matsuda et al.
patent: 4425835 (1984-01-01), Krasnoff
patent: 4646854 (1987-03-01), Arndt et al.

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