Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1989-10-31
1991-05-28
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
411 52, 411 64, E21D 2100
Patent
active
050189085
ABSTRACT:
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.
REFERENCES:
patent: 2870666 (1959-01-01), Dempsey
patent: 2988950 (1961-06-01), Dempsey
patent: 3115056 (1963-12-01), Teeple
patent: 3522755 (1970-08-01), Mitchell
patent: 4437795 (1984-03-01), White
patent: 4516886 (1985-05-01), Wright
patent: 4904123 (1990-02-01), Calandra et al.
American Mining Supply, Inc.
Corbin David H.
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