| 摘要 |
A hole opener or reamer (10), for use in a downhole environment to enlarge a drilled hole, comprises an opener body (12) that includes a retention member (14) coupled therewith to retain a cutter (16) relative to the opener body. The retention member and the opener body cooperate with one another to define a locking chamber (18, figure 3a) that lies therebetween. The locking chamber confines movement of a locking member (26, 42) received therein relative to the opener body. The locking member includes one or more actuator members (28, 48), which may be screws, to move the locking member relative to the opener body. The locking member and one of the opener body and the retention member include formations that are cooperable with one another to drive the retention member and opener body into engagement upon movement of the locking member relative to the opener body caused by operation of the or each said actuator member to inhibit movement of the retention member relative to the opener body and thereby securely retain the cutter relative to the opener body. |
