Switching mechanism

Details Switching mechanism Switching mechanism

1977-01-21

1978-10-24

Maslousky, Paul E.

Motors: expansible chamber type

Cyclically operable

Working member controlled motive fluid for distributor motor

91293, 91300, 91321, 92108, F01L 2506, F01B 718

Patent

active

041214994

ABSTRACT:
The invention provides a hydraulically-driven reciprocatory tool comprising piston with a shoulder reciprocable in a cylinder, and a shuttle valve for controlling supply of fluid to a first face of the piston, the fluid producing a force on the first face which is alternately greater than and less than a constant bias force applied to a second face of the piston, wherein the position of the shuttle valve is determined by the pressure of fluid in a fluid connection between the shuttle valve and first and second ports in the wall of the cylinder, the fluid connection including a first non-return valve for preventing flow of fluid from one of the ports to the shuttle valve and a second non-return valve for preventing flow of fluid from the shuttle valve to the other of the ports. Preferably, each non-return valve has associated with it a variable throttle in the fluid connection and further means are provided for controllable flow of fluid along a branch of the fluid connection.

REFERENCES:
patent: 1306301 (1919-06-01), Chadwick
patent: 1594217 (1926-07-01), Smith, Jr.
patent: 2698517 (1955-01-01), Witt
patent: 2914037 (1959-11-01), Johnston
patent: 3094842 (1963-06-01), Johnston
patent: 3552269 (1971-01-01), Arndt
patent: 3887019 (1975-06-01), Reynolds et al.

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