Mounting for replaceable hammers in impact crusher

Claim 1

A crusher rotor for an impact crusher comprising: an elongate rotor shaft and at least a pair of rotor plates spaced from each other on the shaft and secured to the shaft, a pair of cavities, one recessed inwardly from the perimeter of each plate and the cavities being axially aligned, a backing bar extending between and mounted within the cavities secured to the rotor plates, the backing bar having a front side facing the direction of travel of the rotor and including an axially extending channel indented into said side, an elongate hammer bar extending between and mounted within the cavities with the hammer bar located forwardly of the backing bar and the hammer bar having a rib seated within said channel, said hammer bar having a front side that faces the direction of travel of the rotor and inner and outer shoulders on said front side extending longitudinally of the bar from adjacent one end to adjacent the other end of the bar and a recess on said front side extending longitudinally of the bar intermediate said shoulders, the cavity of each rotor plate having a wedge-engaging surface extending within it and the hammer bar having a wedge-engaging surface in its said recessed region disposed opposite and facing the wedge-engaging surface of the rotor plate and the wedge-engaging surface of a cavity and the wedge-engaging surface of a rotor plate converging on each other progressing radially outwardly on the rotor plate, and a separate detachable wedge member for each of said rotor plates, each wedge member being wedged between the wedge-engaging surface of the rotor plate and the opposed wedge-engaging surface of the hammer bar, the hammer bar further having a transverse raised flange disposed immediately axially outwardly of each wedge member at each end of the hammer bar extending transversely of the shoulders and forming an end of the recessed region.