Patent ID: 6105475
Filing Date: 2000-08-22
Classification: B23P,B25B

Abstract:
A tightening device for tightening up a plurality of threaded members at the same time, the tightening device comprising plurality of rotary shafts each provided at a forward end thereof with a wrench portion fittable to one of a plurality of threaded members, drive means for individually driving the rotary shaft, and control means for detecting the amount of tightening of each threaded member and the tightening torque thereof and controlling the drive means based on the value detected, the control means comprising drive stop means for discontinuing the drive upon the amount of tightening of each threaded member reaching a specified value based on the time when the tightening torque reaches a predetermined value, and judging means for judging each threaded member to be properly tightened in the case where the tightening torque of the threaded member is within a predetermined range, with the difference in tightening torque between the threaded members within a predetermined range, when the drive is discontinued, said drive means comprising motors for driving the respective rotary shafts, each of said motors having a spur gear attached to a forward end of a drive shaft thereof, and each of the rotary shafts having a pinion attached to a base end thereof and meshed with said spur gear.