Patent ID: 8657719

Claim:
A clutch for a rotary drive device, comprising: a rotary plate adapted to be synchronously rotated with a sun gear of a planetary gear set; at least one pawl pivotally mounted onto the rotary plate; an engaging ring sleeved on the rotary plate around the at least one pawl; a drive plate co-axially and rotatably mounted onto the rotary plate against the engaging ring, wherein the drive plate is adapted to drive an output structure; and a casing provided for receiving the rotary plate, the at least one pawl, the engaging ring and the drive plate so that there is friction between the engaging ring and the casing; whereby: the rotary plate is rotated with the sun gear when the planetary gear set is driven and the pawl is outwardly wiggled to engage and drive the drive plate due to a centrifugal force from the rotating rotary plate; and when the rotary plate is stopped, the engaging ring continues to rotate relative to the rotary plate due to inertia and the continually rotating engaging ring inwardly pokes the at least one pawl to disengage the at least one pawl from the drive plate.