Anchor assembly for a mine roof bolt

Details Anchor assembly for a mine roof bolt Anchor assembly for a mine roof bolt

E - Fixed Constructions

21

D

85/24

E21D 21/00 (2006.01) F16B 13/06 (2006.01) F16B 13/00 (2006.01)

Patent

CA 2027728

Anchor assembly for a mine roof bolt or the like in which the bail of an anchor shell having leaves for engaging the side wall of a bore hole has spring fingers for snagging the side wall of a bore hole to prevent downward movement to the anchor shell. The bail has a central opening for the roof bolt to pass through with the central opening having projections that extend inwardly of the opening to form an interference fit with the threads of the bolt as it is rotated through the opening. The leaves of the anchor shell which are clamped against the side wall have surfaces which diverge from tapered surfaces of the plug nut for expanding the anchor shell to prevent plowing between the plug nut and anchor leaves. The surfaces on the leaves extend downwardly from the top to about the bottom of the leaves.

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