HYDRAULIC CYLINDER WITH GUIDE BUSHING FOR A SLIDING DIPPER HANDLE OF A POWER SHOVEL

摘要

A crowd assembly (30) for a power shovel (10) includes a saddle block (34) adapted for pivotal connection to the shovel boom (24). A tubular dipper handle (32) is slideably supported by the saddle block. A hydraulic actuator (50) has a cylinder (52) and a piston rod (54) that is outwardly extendable from one end of the cylinder. One of the cylinder or the piston rod is fixed to the dipper handle and the other one is attached to the saddle block. The cylinder and the piston rod are within the tubular dipper handle which is able to slide longitudinally over the cylinder. A guide bushing (70) extends around the one end of the cylinder and engages an interior surface of the dipper handle. The guide bushing thereby supports that end of the cylinder and inhibits hydraulic actuator from deflecting within the dipper handle when the piston rod is extended from the cylinder.