Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1997-12-08
1999-03-23
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
4052591, 411 32, 411349, 411354, E21D 2100
Patent
active
058850317
ABSTRACT:
An anchor for a mine roof bolt incorporates a single large rib at the top of a segmented shell. This single large rib is forced into the wall of the bore hole by the downward movement of an associated threaded camming nut during the first few revolutions of the roof bolt. The remainder of the outer surface is generally smooth or unserrated and provides a large bearing surface which is urged against the bore hole wall upon further rotation of the bolt. The camming nut has a specific shape flaring substantially near its upper end such that a relative large area of the bore hole wall below the rib is forced into compression.
REFERENCES:
patent: 4655644 (1987-04-01), Lane et al.
patent: 4696611 (1987-09-01), Guay
patent: 4913593 (1990-04-01), Clark et al.
patent: 5011337 (1991-04-01), Clark et al.
patent: 5078547 (1992-01-01), Calandra et al.
patent: 5344257 (1994-09-01), Wright et al.
patent: 5413441 (1995-05-01), Heminger et al.
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