Mine roof expansion anchor with improved bore hole engagement me

Details Mine roof expansion anchor with improved bore hole engagement me Mine roof expansion anchor with improved bore hole engagement me

1992-05-14

1993-06-15

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

4052591, 411 65, 411 67, E21D 2000

Patent

active

052192482

ABSTRACT:
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.

REFERENCES:
patent: 2799201 (1957-07-01), Genter
patent: 3620120 (1971-11-01), Warner
patent: 3726181 (1973-04-01), Dickow et al.
patent: 3896627 (1975-07-01), Brown
patent: 3941028 (1976-03-01), Lobello et al.
patent: 4437795 (1984-03-01), White
patent: 5018908 (1991-05-01), Laphon
patent: 5028188 (1991-07-01), Prince
patent: 5033910 (1991-07-01), Wright
patent: 5094577 (1992-03-01), Clark et al.

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