| 摘要 |
PCT No. PCT/SE93/01066 Sec. 371 Date Jun. 13, 1995 Sec. 102(e) Date Jun. 13, 1995 PCT Filed Dec. 14, 1993 PCT Pub. No. WO94/14580 PCT Pub. Date Jul. 7, 1994In the front head (11) of a machine hammer (10), transversely disposed wedges (18) are adapted to lock the working tool (12) so that the working tool (12) is axially movable by form-restricted cooperation with recesses (16) on the working tool (12). Each wedge (18) is locked in the front head (11) by a key (20), which extends across the wedge (18) into engagement with a transverse bore (21) therein. The key (20) has a releasable locking device including a locking element affixed in the front head (11) and formed by a polyurethane block (24). The block (24) is provided with a through bore (27) and has elastically form-recovering material properties. When, for purposes of locking the key (20), the key (20) is pressed through the bore of the block (24), the block (24) is caused to expand resiliently into an annular groove (22) on the key (20), thereby locking the key (20) in the front head (11) and providing its wedge (18) locking function. In use of two wedges (18), one single key (20) is set to lock both wedges (18) and is locked by one single block (24). |
