| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric tool which enables replacement of a bit not by using a special tool such as a spanner but by de-mounting or mounting the bit.SOLUTION: An engaging member 61 comes, when positioned at an engaging position (P2), into engagement with the outer circumference of a nut member 51 so that the nut member 51 can turn a screw along a rotation axis 40 thereof. On the contrary, the engaging member 61 goes, when positioned at a retracted position, out of engagement with the outer circumference of the nut member 51 so that the nut member 51 cannot turn the screw. Here, a biasing screw 75 biases the engaging member 61 backward so that the arrangement of the engaging member 61 is switched from the engaging position (P2) to the retracted position. In other words, the engaging member 61 of an operation mechanism 60 can be positioned at the retracted position in the ordinary state. In the operation time, a bit B can be removed or attached by operating the engaging member 61 to move to the engaging position (P2). |
