Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1983-08-29
1985-12-10
Husar, C. J.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
411 21, 411 54, E21D 2000, E21D 2100, F16B 1306
Patent
active
045576319
ABSTRACT:
An off-center rock bolt anchor includes a wedge nut having a modified frusto-conical lower end portion having a first surface portion with an enlarged radius of curvature matching that of the mine roof bolt hole. A threaded hole for receiving the shaft of a roof bolt extends longitudinally through the wedge nut parallel to and close to the first surface. A locking cam with outwardly oriented teeth is pivotally connected to an off-center portion of the top surface of the wedge nut. A plurality of expansion wings are positioned around the lower conical portion of the wedge nut and expand outwardly to engage the walls of the bolt hole as the wedge nut is tightened onto the roof bolt. Initial rotation of the bolt causes eccentric rotation of the wedge nut that urges the teeth of the locking cam to engage the side of the bolt hole. Further rotation of the wedge nut causes the pivot connection of the locking cam to act as a pivot point, urging the wedge nut and the teeth of the locking cam against opposite walls of the bolt hole, preventing further rotation of the wedge nut.
REFERENCES:
patent: 1767019 (1930-06-01), Sergeeff
patent: 2988950 (1961-06-01), Dempsey
patent: 3938420 (1976-02-01), Draa
patent: 4147458 (1979-04-01), Elders
patent: 4195547 (1980-04-01), Giannuzzi
patent: 4293244 (1981-10-01), Donan, Jr.
patent: 4295760 (1981-10-01), Warner
patent: 4380407 (1983-04-01), Donan, Jr.
patent: 4403894 (1983-09-01), Clark
patent: 4437795 (1984-03-01), White
Donan David M.
Donan, Jr. David C.
Husar C. J.
Stodola Nancy J.
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