Fluid-pressure driving device

Details Fluid-pressure driving device Fluid-pressure driving device

1984-10-25

1987-01-27

Garrett, Robert E.

Motors: expansible chamber type

Relatively movable working members with one having motive...

Single valve unit controlling plural working chambers

91183, 91396, 91417R, 92 62, 92 65, F15B 1517

Patent

active

046387188

ABSTRACT:
A fluid-pressure driving device including a main actuator unit having a piston adapted to travel a full part of a predetermined stroke and an accelerating actuator unit having a piston adapted to travel only a part of the stroke and being capable of operating only during the acceleration of the object to be actuated. These actuator units are operated under the control of a control valve such that, in the accelerating range in which the speed of the object is still low, both actuator units operate to produce a large actuating force, while, after the acceleration, only the main actuator unit operates to fully travel the required stroke.

REFERENCES:
patent: 787480 (1905-04-01), Tanner
patent: 3312146 (1967-04-01), Ouere et al.
patent: 3623694 (1971-11-01), Goldberg
patent: 4289063 (1981-09-01), Nakamura

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