Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1980-08-14
1983-02-01
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
411531, E21D 2100
Patent
active
043712932
ABSTRACT:
A bearing plate for supporting a portion of a mine roof or similar surface. The bearing plate includes a substantially planar, roof-bearing portion having a roof-bearing surface. Also included is a substantially planar bolt-head bearing surface. The bolt-head bearing surface includes a concentrically located aperature adapted to receive a roof bolt having a bolt head. The bolt-head bearing surface is spaced from the planar roof-bearing portion and is substantially parallel to the roof-bearing surface. A vertical wall extends from the bolt-head bearing surface about its outer periphery. A reinforcing wall extends radially outward from the distal end of the vertical wall and merges with the roof-bearing portion. The reinforcing wall defines a first frusto-conical portion, the base of which is conterminous with the roof-bearing portion, and a second frusto-conical portion, the base of which merges with the distal end of the first frusto-conical portion. The diameter of the base of the second frusto-conical portion is less than the diameter of the distal end of the first frusto-conical portion. The roof bearing surface of the bearing plate, when in use, supports a portion of the mine roof in response to a bearing force applied to the bolt-head bearing surface by the roof bolt. Some embodiments of the subject bearing plate contain embossed reinforcing ribs and dimples in the planar bearing portion.
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patent: 4095431 (1978-06-01), Hannan
patent: 4112693 (1978-09-01), Collin et al.
"Tazewell Underground Roof Control Products and Services", Tazewell Industries.
"Keeping the Roof Over Your Head", Keystone Bolt Company, 1979.
Powers Earl W.
Wilcox Raymond J.
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