| 摘要 |
The holder (3,6) comprises a first part (3) with a recess (4) fixed to the shaft (1), the recess comprising part of a drill hole, and having inner threads corresponding to those on the bolt (12). It also has a second part (6) which is movable along the shaft between a rear position in which the recess (4) is freed, and a front position in which it projects over the recess (4). The second part (6) has a locating surface (9) which in the front position of the part maintains the end of an engaged bolt in threaded engagement with the recess. The first part (3) of the holder consists of a part of a cylindrical casing with central threaded hole, whilst its second part (6) constitutes a completing part of a casing with unthreaded central hole. A lock component (8) releasably locks the second part (6) of the holder in its front position. |
