EXPANSION ASSEMBLY

摘要

An expansion assembly for use with resin on a mine roof bolt includes an expandable shell and a camming plug having a first end wall spaced from a second end wall by a tapered body portion. Four equidistantly spaced grooves extend longitudinally in the tapered body portion. Pairs of grooves are connected across the second end wall by transverse grooves that form resin flow channels. A rib formation extends outwardly from the side wall adjacent to and removed from a groove. The rib formation defines the edge of the groove and abuts an edge of one of the fingers of the expandable shell to align the grooves of the plug with the respective slots formed between the shell fingers. This alignment assures unobstructed flow of the mixed resin downwardly through the plug grooves and shell slots into surrounding relation with the expansion assembly for secure bonding of the assembly with the walls of a bore hole.