| 摘要 |
A quick change gear box for a hardware drilling machine includes a mounting plate having a catch pin bore hole and coupling bolt recesses provided with a coupling bolt bore hole and a coupling bolt slot having an upper surface. A fastening plate is provided with a spring biased catch pin insertable in the catch pin bore hole and spring biased headed coupling bolts receivable through the coupling bolt bore holes into the coupling bolt recesses. The coupling bolts are moveable in the coupling bolt recesses between an uncoupled position and a coupled with the coupling bolt heads urging a clamping force toward the fastening block on the coupling bolt slot upper surface. The coupling bolt slot upper surface ascends from one end of the coupling bolt recess to its other end, and the clamping force is increased by movement of the coupling bolt in the recess from the uncoupled position to the coupled position.
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