Patent ID: 6725976
Filing Date: 2004-04-27
Classification: F16K,F24F,Y10T

Abstract:
A rotary actuator, comprising:a motor; a gear train; an output coupling driven by the motor through the gear train, the gear train multiplying the torque of the motor to drive the output coupling; a manual override mechanism having a first user accessible interface, the manual override mechanism operating in conjunction with the gear train to allow manual positioning of the output coupling; and a manual locking mechanism having a second user accessible interface, the manual locking mechanism engaging the gear train to prevent rotation of the output coupling in a first direction; and a spring return mechanism including a torsion spring coupled to the gear train, the torsion spring being wound upon energization of the motor driving the output coupling in a second direction, the torsion spring unwinding upon de-energization of the motor to drive the output coupling through a portion of the drive train in the first direction.