Torque responsive motor shutoff for power tool

Details Torque responsive motor shutoff for power tool Torque responsive motor shutoff for power tool

1975-07-03

1976-07-20

Purser, Ernest R.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

B23B 4504

Patent

active

039701514

ABSTRACT:
A pneumatic power tool for tightening threaded fasteners includes a planetary gear unit in which the ring gear is rotatable against the bias of a torsion coil spring to actuate a motor shutoff control valve at a predetermined torque reaction exerted on the ring gear. The torsion spring is in a substantially relaxed state during fastener rundown and before torque buildup on the fastener regardless of the torque setting at which motor shutoff is to occur. Adjustment of the motor shutoff torque setting is obtained by changing the positional relationship between a control valve pushrod and a cam surface on the ring gear member.

REFERENCES:
patent: 3645341 (1972-02-01), Amtsberg
patent: 3666021 (1972-05-01), Whitehouse
patent: 3821991 (1974-07-01), Alexander
patent: 3834467 (1974-09-01), Fuchs

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