Patent ID: 7055795
Filing Date: 2006-06-06
Classification: F16D,F16K

Abstract:
1. A motorized valve actuator wherein the drive from the motor to the output shaft of the actuator is via a gear mesh which is incapable of being back driven, the actuator having an alternative manual drive, the manual drive comprising a hand wheel and a clutch and lever to change from motor power drive to hand drive mode, the actuator further having an intermediate shaft between the motor and output shaft, the hand wheel being carried by or at least operatively linked to the intermediate shaft to drive the intermediate shaft, characterized in that the intermediate shaft is positioned between the motor and the gear mesh whereby when the lever is operated to bring the actuator into hand drive mode the clutch mechanism operates substantially freely, the output shaft torque generated by the previous motor powered run and locked into the output shaft by the non-back driving gear mesh not being locked into the clutch mechanism, wherein the clutch comprises a moving clutch member and a co-operating clutch operator having co-operating conical surfaces.