Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber
Patent
1993-01-29
1995-01-31
Oberleitner, Robert J.
Brakes
Internal-resistance motion retarder
Having a thrust member with a variable volume chamber
188317, 92 85B, 92136, 91 23, F16F 928, F16F 500
Patent
active
053852184
ABSTRACT:
A pneumatic, rotary, rack and pinion actuator with counter-pressure actuated damping device. The actuator comprises first and second rack and piston assemblies reciprocable inside corresponding pneumatic cylinders, which engage on the opposite sides of a pinion and output shaft. Each rack and piston assembly is provided with an axially extending duct opening at opposite ends into a drive chamber and a counter-pressure control chamber, respectively; counter-pressure control and damping means are provided in the piston-assemblies and cylinders, comprising a throttling valve opening into the control chamber and a check valve in said ducts; a thrust pin member protrudes in the control chamber and into the duct end to open the check valve and feed in a controlled manner pressurised air from the drive chamber into the control chamber, before each rack and piston assembly reaches the end of its stroke.
REFERENCES:
patent: 2233521 (1941-03-01), Ernst et al.
patent: 2279160 (1942-04-01), Davis
patent: 2389654 (1945-11-01), Van Der Werff
patent: 3447423 (1969-06-01), Henry
patent: 3831500 (1974-08-01), Kitamura et al.
patent: 4088063 (1978-05-01), Sheppard
patent: 5076090 (1991-12-01), Cetnarowski
"Actuators, rotary", Fluid Power Handbook & Directory, 1986-1987, pp. 36 and 37.
Oberleitner Robert J.
Rutherford Kevin D.
Univer S.p.A.
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