Speed responsive motor shutoff mechanism for fluid operated...

Details Speed responsive motor shutoff mechanism for fluid operated... Speed responsive motor shutoff mechanism for fluid operated...

B - Operations, Transporting

23

P

121/124, 121/6

B23P 19/06 (2006.01) B25B 23/145 (2006.01) F01C 13/02 (2006.01)

Patent

CA 1125593

ABSTRACT OF THE DISCLOSURE A portable pneumatic tool includes a valve closure member interposed in the tool motor exhaust passage and engaged with a speed responsive mechanism comprising a plurality of flyweights operable to move the closure member to an open position on starting of the tool motor. On decreasing motor speed a coil spring assisted by a fluid pressure drop across the closure member forces the closure member to move against the decreasing centri- fugal force exerted by the flyweights to shut off-motor exhaust fluid flow to stop the motor. The closure member is normally held in a partially open position by a second spring to enable the motor to be started. -10-

337500

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