Patent ID: 7111719

Claim:
A hub clutch device, comprising: a threaded shaft; a hub rotatably mounted on the shaft; a positioning sleeve secured in the hub for rotating the hub and having a first end having an inner wall formed with a tapered face; a movable sleeve movably mounted in the positioning sleeve and having a first end having an outer wall formed with a tapered face detachably urged on the tapered face of the positioning sleeve and a second end having a face formed with a plurality of arc-shaped adjusting slots; an elastic member mounted on the shaft and biased between the hub and the movable sleeve; a fixing seat rotatably mounted on the shaft and having a first end having a face formed with a plurality of arc-shaped adjusting slots each aligning with a respective one of the adjusting slots of the movable sleeve; and a plurality of urging balls each movably mounted between a respective one of the adjusting slots of the movable sleeve and a respective one of the adjusting slots of the fixing seat.