Fluid powered control system with a load pressure feedback

Details Fluid powered control system with a load pressure feedback Fluid powered control system with a load pressure feedback

2006-10-17

2006-10-17

Look, Edward K. (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Both inlet and exhaust controlled by motive fluid pressure...

C060S493000

Reexamination Certificate

active

07121187

ABSTRACT:
An apparatus controls fluid flow to an actuator. A feedback mechanism responds to a pressure differential that occurs across the actuator by altering the fluid flow. That pressure differential indicates acceleration of the actuator that can occur when the load acting thereon varies. Thus as the actuator accelerates, the apparatus reduces the flow of fluid which counteracts the acceleration and maintains the actuator speed relatively constant. A unique directional control valve incorporates the feedback mechanism that functions regardless of the direction in which the actuator moves.

REFERENCES:
patent: 3799200 (1974-03-01), Tipton
patent: 3872671 (1975-03-01), Verlinde
patent: 4320782 (1982-03-01), Pauliukonis
patent: 4643225 (1987-02-01), Imhof
patent: 5251671 (1993-10-01), Hiroki
patent: 5284220 (1994-02-01), Shimizu et al.
patent: 5497692 (1996-03-01), Marcott
patent: 5992294 (1999-11-01), Seddon

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