Fail-safe electric actuator

Details Fail-safe electric actuator Fail-safe electric actuator

1981-04-08

1988-07-19

Kyle, Deborah L.

Power plants

Pressure fluid source and motor

Apparatus having means responsive to or ameliorating the...

60328, 60371, 60413, 60911, 251 59, 251 71, F15B 1512

Patent

active

047576847

ABSTRACT:
A fail-safe electric actuator, for use with a control mechanism such as a valve, is disclosed. The actuator device eliminates the possibility of the control mechanism being locked in operative position by the interruption of electric power, by automatically and mechanically returning the control mechanism to its inopertive position as soon as current is cut off. This is accomplished by the release of a torsion spring, wound previously by the rotation of a fluid-driven vaned torque actuator in turning both the control-mechanism and the electric fail-safe actuator into operative position.

REFERENCES:
patent: 3279744 (1966-10-01), Fieldsen et al.
patent: 3430916 (1969-03-01), Raymond, Jr.
patent: 3572032 (1971-03-01), Terry
patent: 3752041 (1973-08-01), Smith
patent: 3753350 (1973-08-01), Nott
patent: 3808895 (1974-05-01), Fitzwater
patent: 4246753 (1981-01-01), Redmond

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