Mine coal cutting pick cone fixing lug - has reverse cone and circular sections, and reducing collar on ledge

摘要

The pick is used esp. on mineral extracting or forward-driving machines in underground mining. The shaft and head of the pick are circular in cross-section, and a fixing lug on the cone is inserted in a hole on the end of the head, with solder in an annular gap. There is a reducing collar (2) between cone (3) and lug (4), set on a ledge (8). The lug comprises a section (11) attached to the collar, of inverted cone shape, and a cylindrical section (12) attached to it, and it fits the lug hole (5). An intervening peripheral soldering-medium gap is cut out, with the reducing collar seated on the ledge. This prevents the fixing lug from becoming prematurely detached from its hole during pick operation.