| 摘要 |
PROBLEM TO BE SOLVED: To provide a wrench that can rotate a screw component in one direction when an operation member moves forward and rotate the screw component in the same direction as the rotation direction in the forward movement when the operation member moves backward.SOLUTION: A wrench 10 comprises a gear case 12, an input shaft 17 rotatably supported by the gear case 12, an operation handle 21 that reciprocatively rotates the input shaft 17 by reciprocation, an output shaft 19 rotatably supported by the gear case 12 and coupled with the screw component, and a gear transmission mechanism 30 that converts the reciprocative rotation of the input shaft 17 into rotation in one direction of the output shaft 19 to have a constitution that the output shaft 19 is rotated in one direction by the forward movement of the operation handle 21 and rotated in the same direction by the backward movement of the operation handle 21. |
