| 摘要 |
An electrically operated fastening appliance with an automatic controlling clutch mechanism by which on termination of the fastening operation the power transmission from the motor (13) to the driving spindle (36) is instantly discontinued to prevent application of the excessive torque to the screw-threaded connecting means to be tightened and transmission of undesired reversing torque. The automatic controlling clutch mechanism includes a central gear (40) secured to a drive shaft (38) derived from the motor (13), planetary gears (30) supported on a planet carrier (32) and an annulus member (29) with an internal gear (28) accommodated turnably in a cylindrical casing (14) and clutch elements interposed between the annulus member (29) and the casing (14). |
