便携式手持动力工具。手柄部位振动量的测量。第7部分：具有冲击，冲力和棘轮传动动作的扳手，螺锥和螺母拧紧器。

Hand - held portable power tools. measurement of vibrations at the handle. part 7: wrenches, screwdrivers and nut runners with impact, impulse or ratchet action.

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它由地轮、传动销、传动拐臂、传动插杆、回位弹簧和传动棘轮组成。

The utility model is composed of a land wheel, a driving pin, a driving crank arm, a driving inserted link, a release spring, and a driving ratchet.

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