Torque responsive motor shutoff for power tool

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

F - Mech Eng,Light,Heat,Weapons

01

C

121/6

F01C 13/02 (2006.01) B23B 45/04 (2006.01) B25B 23/145 (2006.01)

Patent

CA 1037796

TORQUE RESPONSIVE MOTOR SHUTOFF FOR POWER TOOL ABSTRACT OF THE DISCLOSURE 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 shut- off 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.

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