TOOL LOCKING MEANS FOR MACHINE HAMMERS

摘要

In the front head (11) of a machine hammer (10) transversely disposed wedges (18) are adapted to lock the working tool (12) axially movably by form-restricted cooperation with side 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 consisting of 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 wedge (18) is pressed through the bore of the block (24), the latter is due to expand resiliently into an annular groove (22) on the key (20), thereby locking the key (20) in the front head (11) and securing 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 in its turn by one single block (24).