Rock bolt drive assembly

摘要

A drive assembly for a rock bolt having a shaft, the drive assembly comprising a drive receiving portion adapted to be part of or disposed on or about the shaft, the drive receiving portion having a dolly engagement end surface, and a dolly having a bolt engagement end surface, the bolt engagement end surface and the dolly engagement end surface each having a profile adapted such that operative engagement to impart rotary drive between the drive receiving portion and the dolly is effected by contact in an end-to-end arrangement between the bolt engagement end surface and the dolly engagement end surface.