| 摘要 |
<p>In the field of borehole creation there is a need for a reciprocable impact hammer with a tool that is rotatable while under load. A reciprocable impact hammer (10) for use in a downhole location comprises a tool support member (11); a hammer member (12); a jack mechanism (13); a connector member (14); and a transmission (16). The transmission (16) converts linear motion of the connector member (14) to rotary motion of the hammer member (12) whereby when a force acts on the connector member (14) via the hammer member (12) and the tool support member (11) operation of the jack mechanism (13) causes initial elongation of the impact hammer (10) followed in succession by: (i) collapsing of the hammer member (12) and the tool support member (11) together such that the hammer member (12) separates from the connector member (14) and imparts an impulse to the tool support member (11); and (ii) movement of the connector member (14) towards the hammer member (12) under the influence of the force whereby the transmission (16) causes rotation of the remainder of the impact hammer (10).</p> |
