Spring return rotary actuator

Details Spring return rotary actuator Spring return rotary actuator

1991-11-27

1993-01-26

Ro, Bentsu

Electricity: motive power systems

With particular motor-driven load device

Power- or motion-transmitting mechanism

318 40, 318 51, 318160, 185 40R, 25112911, 251 69, F16K 3104

Patent

active

051824981

ABSTRACT:
A rotary actuator uses a two degree of freedom gear train with three torque members to provide torque to the output element from a first torque member. The torque is supplied to a second torque member from a drive motor. A torsion spring on the third torque member is normally wound tight and held wound by a brake which locks the third torque member during normal operation when electrical power is available for the drive motor. When power is lost, the brake releases the third torque member, allowing the spring to apply torque to the third torque member to drive the output element through the first torque member to a return position. This allows loads such as valves to be returned to a safety condition upon loss of electrical power to the system of which the load and the actuator are a part.

REFERENCES:
patent: Re32610 (1988-02-01), Washbourn et al.
patent: 4270452 (1981-06-01), Gertsch et al.
patent: 4595081 (1986-06-01), Parsons
patent: 4677355 (1987-06-01), Baumann
patent: 4741508 (1988-05-01), Fukamachi
patent: 5016589 (1991-05-01), Terazawa
patent: 5085401 (1992-02-01), Botting et al.

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