Spring return rotary actuator

Details Spring return rotary actuator Spring return rotary actuator

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 31/04 (2006.01) F16H 3/72 (2006.01) F16H 33/00 (2006.01)

Patent

CA 2083191

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.

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