| 摘要 |
The invention relates to a drill bit wrench (10) for use on a drilling apparatus for loosening a drill bit segment of a drill bit during drilling of holes into the ground. The wrench includes a carrier member (12) operatively supported on the drilling apparatus. A gripping member (26) is displaceably located on the carrier member and a lever arm (38) is pivotally located on the gripping member, displacement mechanisms (20, 34, 42) providing for required displacement of the parts of the wrench for its operation. One displacement mechanism (42) provides for an initial direct gripping force to be applied on a drill bit segment, which force is sufficient to permit loosening of the segment in normal circumstances, an additional gripping force, to be induced by a wedging action of a wedge face of the lever arm, being provided for, where required. |
