| 摘要 |
A rack for mounting on a segmented mine wall face conveyor and for assisting the movement of a drum mining machine along the conveyor, the rack comprising a series of rack segments aligned substantially in an end-to-end relationship, each rack segment provided with a plurality of equidistantly spaced pins adapted for driving engagement with a pinion of the drum mining machine, each segment rotatably mounted on the conveyor, and adjacent rack segments rotatably joined together by a connection link. Means are disclosed for extending and contracting the connection link relative to each adjacent rack segment, and means are disclosed for maintaining the rack at a relatively constant position relative to the pinion in the region of engagement with the pinion.
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