Actuator with neutral position return

Details Actuator with neutral position return Actuator with neutral position return

1992-02-14

1993-06-22

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

With safety means operable upon input signal loss

91392, 91410, 91459, 91467, 91468, F15B 2000, F15B 1304, F15B 1108

Patent

active

052208613

ABSTRACT:
The mechanism has an actuator provided with a piston, a servo control valve which is actuated by electric input and output signals for supplying working fluid to the actuator and exhausting working fluid from the actuator, a slider which closes an oil passage from the servo control valve to the actuator and which temporarily engages with the piston of the actuator via a link mechanism, when a system for transmitting the input and output signals or the servo control valve breaks down, and a centering valve which is constructed in one body with the slider and which stops supply and exhaust of working fluid after the actuator has been returned to its neutral position by supply of working fluid to the actuator when a system for transmitting the input and output signals or the servo control valve breaks down.

REFERENCES:
patent: 2346418 (1944-04-01), Dodson
patent: 2352470 (1944-06-01), Carlton
patent: 3468126 (1969-09-01), Mercier
patent: 3583285 (1971-06-01), Johnson
patent: 4936196 (1990-06-01), Kamimura et al.
patent: 4953445 (1990-09-01), Kervagoret et al.

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