Reciprocating linear fluid motor

Details Reciprocating linear fluid motor Reciprocating linear fluid motor

1981-12-17

1984-08-21

Yost, Frank T.

Tool driving or impacting

Self-acting advance and retraction cycle

91165, 91220, 91300, 91325, 92134, 173119, E21C 304

Patent

active

044664931

ABSTRACT:
Hydraulic fluid pressure moves a piston (22) against a body of incompressible fluid (14), compressing a spring (42). The pressure is released, and the force of the stored energy in the spring (42) is transmitted to the piston (22) by the body of fluid (14) and drives the piston (22) through its power stroke. The fluid (14) is vented to an outlet (8) before the piston (22) reaches the end of its power stroke, removing the force from the piston (22) and allowing it to free travel through the remainder of the stroke. When the motor (2) is operating and the load is removed from the piston (22), the hydraulic fluid inlet (10) is short-circuited to the outlet (8) and the motor (2) automatically shuts off.

REFERENCES:
patent: 3399602 (1968-09-01), Klessig et al.
patent: 3431985 (1969-03-01), Bowen
patent: 3487752 (1970-01-01), James
patent: 3739863 (1973-06-01), Wohlwend
patent: 3782483 (1974-01-01), Wandell
patent: 3827507 (1974-08-01), Lance
patent: 3866690 (1975-02-01), Lance et al.
patent: 4264107 (1981-04-01), Janach et al.
patent: 4281587 (1981-08-01), Garcia-Crespo
patent: 4293045 (1981-10-01), Zeidman et al.
patent: 4380901 (1983-04-01), Rautimo et al.

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