| 摘要 |
PROBLEM TO BE SOLVED: To provide a portable impact driver that is operatively engageable with the chuck of an electric drill or the like.SOLUTION: An impact mechanism 20 for use with a drive motor comprises a drive engaging member 30 and a tool bit retaining member 40 operatively inter-connected with the drive engaging member. The tool bit retaining member has a main body portion 42, and an anvil portion and a tool bit retaining portion each securely attached to the main body for co-rotation therewith. A hammer is mounted on one of the drive engaging member for guided movement between an anvil contact position whereat force is transmitted from the hammer to the anvil portion so as to create a moment about the longitudinal axis, and a release position whereat the hammer is temporarily removed from the anvil portion. A spring 70 biases the hammer to the anvil contact position. |
