| 摘要 |
An apparatus for providing repetitive percussive blows in tools and the like comprises an elongated hammer movable along its longitudinal axis from an extended position to a retracted position. A bias element urges the hammer towards the extended position. A cam member is attached to a face of a rotating drive member at a point removed from the drive member's rotational axis. The cam member bears against the hammer during only a portion of each revolution of the drive member so as to move the hammer against the bias force from the extended position to the retracted position and then release the hammer, which then moves toward the extended position to deliver a percussive blow.
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