| 摘要 |
<p>This invention relates to a downhole tool (100) comprising a housing (101), an actuating member (105) which is movable relative to the housing, and at least one tool member (103) which is movable between a retracted position and a radially extended position, wherein the movement of said actuating member (105) induces the movement of said tool member. The tool comprises means (107, 125b) for preventing relative movement of the actuating member (105) and the tool member (103), preferably a profiled cam surface (107) cooperating with a contact surface (125b) of the tool member (103), such that the tool member (103) is locked in the retracted position and in the extended position when the actuating member (105) is in a first position and in a second position respectively.</p> |
