COLLET CHUCK OPERATED BY THROTTLE CONTROL FOR ROTARY POWER TOOL

摘要

A portable rotary power tool including a housing having a vane-type pneumatic motor disposed therein. The motor is coupled to an output shaft rotatably supported within the housing. A collet is keyed within the shaft and is adapted to releaseably grip a tool bit. A throttle valve controls operation of the motor and is operated by a pivoted lever mounted on the housing. When the lever is moved in a direction opposite to that required for operation of the motor, the collet is positively released from the bit.