| 摘要 |
<p>The present invention relates to a powered hammer device including: a hammer with at least a first and a second projection; at least one translation dog adapted to engage with said projections, and a drive mechanism capable of moving the translation dog substantially reciprocally between a first and a second opposed directions, characterised in that the translation dog is adapted to engage with the first projection to move the hammer in the first direction, the translation dog then engaging the second projection to move the hammer in the reciprocal second direction.</p> |
