Torque control apparatus for power tools

Details Torque control apparatus for power tools Torque control apparatus for power tools

G - Physics

05

D

341/108.1

G05D 15/01 (2006.01) B25B 23/145 (2006.01) G05D 17/02 (2006.01)

Patent

CA 1037592

ABSTRACT This disclosure deals with a control circuit for a tool including a motor for turning a rotatable power output shaft of the tool. A torque measuring device is coupled to the shaft and generates a signal which is a function of the torque output. The control circuit responds to the torque output and to a reference signal representing a preselected torque, and automatically turns off the motor when the torque output reaches the preselected torque. Further, the control circuit may cyclically turn the tool on and off at very short time intervals as the preselected torque valve is being ap- proached, in order to reduce the reaction torque felt by an operator of the tool. In addition, the lengths of the on times in successive cycles may be gradually decreased as the torque output level increases, with the result that the aver- age reaction torque remains substantially constant even though the peak torque output increases.

214318

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