| 摘要 |
A readily removable tool holder constructed to be held in a receptacle which may be carried on the spindle of a tapping attachment. A torque release clutch is built into the removable tool holder for the purpose that when one tool holder is substituted for another, it is not necessary to make adjustments in the torque release clutch of the tapping attachment itself. The parts of the torque release clutch are of relatively small diameter to fit into the tool holder. Improvements are embodied in the torque release clutch. Clutch members are provided including a first clutch member and a second clutch member. The main biasing spring acts on the first clutch member. When the clutch parts are disengaged, the first member is moved against the spring and held in an inactive position wherein it is completely out of engagement with the teeth of the other clutch member to eliminate wear. The second clutch member is biased by a relatively light spring to provide just enough engagement between the clutch faces so that upon reversal such faces will re-engage.
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