Mine roof expansion anchor with improved bore hole...

Details Mine roof expansion anchor with improved bore hole... Mine roof expansion anchor with improved bore hole...

E - Fixed Constructions

21

D

E21D 21/00 (2006.01) E21D 20/00 (2006.01)

Patent

CA 2073572

A mine roof expansion anchor having a conventional tapered camming plug and radially expansible shell having associated therewith an element which resiliently engages the wall of a bore hole as a roof bolt carrying the anchor is inserted in the hole. The resilient element may be incorporated in the structure of a bail having bore wall engagement portions position in a plane closer to the lower end of the expansion shell than the lowest position of the tapered plug after full expansion. The engagement portions may comprise outwardly and downwardly extending portions of the bail legs, either at the terminal ends or pierced from the bail material slightly above the ends. In another embodiment, the engagement portions extend from a support nut positioned on the bolt below the lower end of the shell.

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