| 摘要 |
The present invention relates to a multi-purpose tool having particular, although not exclusive, use in conjunction with milling machines in which a drawbar is employed to engage and disengage a tool collet wherein the drawbar protrudes above the machine tool and is rotatable to release and secure the collet. The tool of the present invention combines a socket wrench for rotating the drawbar and a mallet for tapping the bar to free up the collet taper. The tool is dynamically balanced about the axis of the center of mass which is fitted to the protruding end of the drawbar. A handle is provided which is extendable to increase the torque or leverage available to the user and the handle itself is weighted to take advantage of centrifugal force to urge the handle towards its retracted position. A beveled pin or wedge device is also provided to inhibit the lowering of the drawbar with the tool still engaged with the protruding end. Finally, a safety cut off switch is provided in conjunction with the tool holder which is selectively actuated to preclude operation of the machine with the tool elsewhere than in the tool holder.
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