Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1992-06-29
1993-04-20
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
4052594, 411 33, 411 75, E21D 2100
Patent
active
052036472
ABSTRACT:
An anchor for securing a mine roof bolt within a hole preformed within a rock strata. The anchor comprises a plurality of transversely bent plastic leaves, each having an aperture through which the roof bolt is received, a support nut threadably connected to the bolt for supporting the plastic leaves, a stirrup supported on the support nut and on which the leaves are rested and a bifurcated compression nut having a biasing member threadably connected to the roof bolt and a horizontal member slidably connected to the bolt below the biasing member and above the leaves for compressing the leaves against the stirrup responsive to the rotation of the roof bolt in a selected direction. As the transversely bent leaves are compressed the edges thereof are urged against the strata to grip the same and thereby secure the roof bolt within the hole. The stirrup and the horizontal member are shaped to maintain the leaves at a selected inclination during compression. The horizontal member has two flanges on either end thereof that contact an upper plastic leaf adjacent the edges thereof to maintain the upper leaf and the supporing plastic leaves therebelow in the selected inclination.
REFERENCES:
patent: 2950602 (1960-08-01), Lang
patent: 3754401 (1973-08-01), Lipow
patent: 4147458 (1979-04-01), Elders
patent: 4295760 (1981-10-01), Warner
patent: 4472088 (1984-09-01), Martin
patent: 4626139 (1986-12-01), Blackwell
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