Dual piston actuator

Details Dual piston actuator Dual piston actuator

1981-12-28

1985-01-29

Hershkovitz, Abraham

Brakes

Operators

Fluid pressure

91173, 92 52, 92 60, 92 63, 92132, 188 724, 188348, B60T 1100, F01B 720

Patent

active

044960336

ABSTRACT:
A pair of axially aligned and nested pistons are mounted in a pressure sealed arrangement within the bore of a pressure housing. A primary piston is moved in response to increasing pressure to provide an actuating output force while a secondary piston simultaneously moves to overcome a reverse bias on it by a tension spring and adds to the actuating force by engaging the primary piston only when the pressure exceeds a specific higher threshold. The primary and secondary pistons thereafter operate in conjunction under the influence of high pressure to provide the output actuating force.

REFERENCES:
patent: 2826277 (1958-03-01), Hawley
patent: 3191506 (1965-06-01), Ledeen
patent: 3584536 (1971-06-01), Hillberry
patent: 3687015 (1972-08-01), Chavarria
patent: 3831999 (1974-08-01), Sonneborn
patent: 4000758 (1977-01-01), Meisenheimer, Jr.
patent: 4125059 (1978-11-01), Tuji
patent: 4195714 (1980-04-01), Massing
patent: 4306639 (1981-12-01), Mitchell
patent: 4341105 (1982-07-01), Gerrick, Jr.
patent: 4375781 (1983-03-01), Bessho

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