Control circuit for a power tool

Details Control circuit for a power tool Control circuit for a power tool

1975-10-10

1978-01-03

Schaefer, Robert K.

Electricity: motive power systems

Limitation of motor load, current, torque or force

318432, H02K 1732, H02K 2368, H02K 2730

Patent

active

040669424

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 value is being approached, 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 average reaction torque remains substantially constant even though the peak torque output increases.

REFERENCES:
patent: 3412307 (1968-11-01), Welsh
patent: 3551774 (1970-12-01), Rusch
patent: 3564366 (1971-02-01), Worrell
patent: 3569807 (1971-03-01), Ulrich

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