Abstract: A tool device includes a main body, a cutting member and a locking mechanism. The main body is formed with a receptacle for receiving the cutting member. The cutting member is movably mounted on the main body and selectively moves between a first position of being received in the main body and a second position of being removed from the receptacle and ready to use. The locking mechanism is mounted on the main body and changeable between a locking mode and a release mode. In the locking mode, the cutting member cannot be moved from the first position to the second position. While, in the release mode, the cutting member is free to move to the second position for use.

Abstract: A safety mechanism of a rotational tool includes at least a tool unit, a safety pivot with a long end part and a control device. The tool unit has a fixed shaft with a tail end. The safety pivot is disposed at the shaft with a perimeter having variable distance to the axis itself. The control device controls the safety pivot. The long end part of the safety pivot can resist the tail end of the tool unit from rotating during being disposed to face the fixed shaft.

Abstract: A tool device includes a main body, a working piece and a locking mechanism. The main body is formed with a receptacle for receiving the working piece. The working piece is movably mounted on the main body and selectively moves between a first position of being received in the main body and a second position of being removed from the receptacle and ready to use. The locking mechanism is mounted on the main body and changeable between a locking mode and a release mode. In the locking mode, the working piece cannot be moved from the first position to the second position. While, in the release mode, the working piece is free to move to the second position for use.