Patent ID: 8262169
Filing Date: 2012-09-11
Classification: E21C

Abstract:
1. A rack bar haulage system forming part of a drive system for moving the mining machine along a conveyor including a plurality of conveyor pans, the pans being arranged end to end, said rack bar haulage system including a plurality of rack bars having a longitudinal axis, each having spaced apart gear teeth extending between cheek sections at opposite sides of the rack bar, each rack bar including an end, the end including a pillar portion extending downwardly perpendicular to the longitudinal axis of the rack bar, one rack bar adapted to be mounted adjacent an end of a line pan, and another rack bar adapted to be mounted adjacent the adjacent end of the adjacent line pan, a chain-link, the chain-link surrounding and engaging the two adjacent pillar portions on the ends of the one rack bar and the adjacent other rack bar, said chain-link adapted to extend over the adjacent ends of the line pans, and means for retaining the chain link on said rack bar pillar portions.