Electric fail-safe actuator

Details Electric fail-safe actuator Electric fail-safe actuator

1975-10-29

1979-11-06

Scott, Samuel

Machine element or mechanism

Automatic operation or control

74625, 251 66, 251 68, 251 69, 251 70, 251 71, F16H 540, G01G 1700

Patent

active

RE0301353

ABSTRACT:
An electrically operated fail-safe valve actuator employs a spring which is wound to store energy during operation of the electric drive motor, an electric clutch operable to disengage the drive motor from the actuator output shaft in response to loss of power from the electrical supply whereby the spring drives the valve in the opposite direction.

REFERENCES:
patent: 3279744 (1966-10-01), Fieldson et al.
patent: 3466005 (1969-09-01), Kleeberg
patent: 3572163 (1971-03-01), Clark
patent: 3606980 (1971-09-01), Simpson et al.

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