Patent ID: 6742765
Filing Date: 2004-06-01
Classification: F16K

Abstract:
A spring return type operating device comprising:a yoke adapted to be mounted on an object to be operated having a rotating shaft; an actuator having a drive unit and an output shaft rotated by the drive unit, said actuator being detachably mounted on said yoke; and a spring unit detachably mounted on said yoke so as to lie between said actuator and said object to be operated, said spring unit having a rotating shaft and a return spring for producing a spring force for rotating the rotating shaft in one direction, said rotating shaft having a first end portion thereof adapted to be coupled to the rotating shaft of the object to be operated and a second end portion thereof coupled to the output shaft of said actuator, said yoke defining a space for accommodating at least part of said actuator and at least part of said spring unit, said space having an open face for making coupling portions of the first and second end portions of the rotating shaft of said spring unit with the rotating shaft of the object to be operated and the output shaft of said actuator, respectively, visible from exterior.