Constant speed actuator

Details Constant speed actuator Constant speed actuator

1977-02-23

1979-03-27

Schwadron, Martin P.

Expansible chamber devices

With means to control flow of non-working arresting fluid...

92143, 137504, F15B 1522

Patent

active

041459598

ABSTRACT:
A constant speed actuator significantly characterized by being able to produce a displacement at constant speed, even though the loading on a hydraulically damped piston is substantially varied. The actuator consists of a pneumatic driving pressure which acts against a volume of hydraulic fluid, through a interface with a free piston. The hydraulic fluid, thus acted upon by the pneumatic pressure, flows to the opposite side of the hydraulic load piston through a hydraulic fluid by-pass at a constant volumetric rate regardless of the loading on the hydraulic piston. The constant volume by-pass flow is automatically controlled by employing a constant volume valve in the by-pass. Consequently, a consistent, predictable speed of actuation is achieved over a wide range of hydraulic piston loadings and pneumatic supply pressure.

REFERENCES:
patent: 2679827 (1954-06-01), Perdue
patent: 3142230 (1964-07-01), Bidlack
patent: 3336941 (1967-08-01), English
patent: 3424154 (1969-01-01), Kinsley
patent: 3425219 (1969-02-01), Oliver
patent: 3531065 (1970-09-01), Brown
patent: 3871527 (1975-03-01), Schimmeyer
patent: 4050359 (1977-09-01), Mayer

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