Motors: expansible chamber type – With correlated control of motive fluid and locking means – By electrical control means
Patent
1991-06-24
1992-11-10
Denion, Thomas E.
Motors: expansible chamber type
With correlated control of motive fluid and locking means
By electrical control means
91 44, 92 8, 60562, 60581, 60591, F15B 1526
Patent
active
051614499
ABSTRACT:
The present invention provides a pneumatically powered actuator having hydraulic control for both locking and controlling the velocity of an output rod without any sponginess. The invention includes a double-acting pneumatic actuator having a bore, a piston slidably engaged within the bore, and a control rod connected to the piston. The double-acting pneumatic actuator is mounted to a frame. A first double-acting hydraulic actuator having a bore, a piston slidably engaged within the bore, and a follower rod mounted to the piston is mounted to the frame such that the follower rod is fixedly connected to the control rod. The maximum translation of the piston within the bore of the first double-acting hydraulic actuator provides a volumetric displacement V.sub.1. The present invention also includes a second double-acting hydraulic actuator having a bore, a piston slidably engaged within the bore, and an output rod mounted to the piston. The maximum translation of the piston within the bore of the second double-acting hydraulic actuator provides a volumetric displacement V.sub.2, where V.sub.2 =V.sub.1. A pair of fluid ports in each of the first and second double-acting hydraulic cylinders are operably connected by fluid conduits, one of which includes a valve circuit which may be used to control the velocity of the output rod or to lock the output rod in a static position by regulating the flow of hydraulic fluid between the double-acting cylinders.
REFERENCES:
patent: 2715389 (1955-08-01), Johnson
patent: 3064514 (1962-11-01), Wilson
patent: 3176801 (1965-04-01), Huff
patent: 3315768 (1967-04-01), Stuhler et al.
patent: 3850078 (1974-11-01), Polizzi
patent: 3894477 (1975-07-01), Tomikawa
patent: 4276813 (1981-07-01), Weyman
patent: 4526088 (1985-07-01), Reuschenbach et al.
Progress Report: Conceptual Design & Analysis of a Novel Actuator, by Evet, Jr. et al., Oct. 1988.
Thesis: Modeling and Controll of a Novel Robotic Actuator, by Ingram Dec. 1988.
Denion Thomas E.
Fendelman Harvey
Kagan Michael A.
Keough Thomas Glenn
The United States of America as represented by the Secretary of
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