| 摘要 |
PURPOSE: A screw driver is provided to easily release a screw and to tighten the screw as needed by installing a foldable auxiliary handle in the handle of a driver with a hinge pin. CONSTITUTION: A fordable auxiliary handle(3) is combined with a handle(2) of a driver(1) with a hinge pin(4). To release or tighten a screw, the auxiliary handle is deployed and rotated to add rotation force to the handle. Therefore, the screw is easily released or tightened with little force.
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