Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1978-05-18
1980-01-15
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
85 1JP, 85 50R, 85 63, 277191, E21D 2100
Patent
active
041836995
ABSTRACT:
An improved method and mine roof bolt assembly for sealing a roof bolt hole in a mine to reliably prevent ambient mine air from entering the roof bolt hole. The roof bolt assembly includes a support plate, a roof bolt extending through a hole in the support plate, a flexible washer/gasket for providing a reliable seal between the support plate and a portion of the mine roof surrounding the roof bolt hole and also providing a reliable seal to the roof bolt shaft. An expansion shell is attached to a threaded end of the mine roof bolt to anchor the mine roof bolt assembly in the roof bolt hole. The washer/gasket includes an outer annular portion for providing a reliable seal between the mine roof and the support plate. The washer/gasket also includes a flexible inner annular portion for providing a reliable seal to the roof bolt shaft. The inner annular portion includes a relatively thin sphincter annulus which grips the roof bolt shaft to produce the seal therewith. A flexible interstitial annular washer having a tapered surface is disposed in an interior annular groove within the washer/gasket and is forced inwardly to grip the roof bolt shaft by compression of the washer/gasket as the roof bolt is tightened during installation of the roof bolt assembly, thereby producing tighter sealing to the roof bolt shaft.
REFERENCES:
patent: 769684 (1904-09-01), Garlock
patent: 2235078 (1941-03-01), Meisterhans
patent: 2666354 (1954-01-01), Dim et al.
patent: 2829502 (1958-04-01), Dempsey
patent: 3326004 (1967-06-01), Williams
Donan David M.
Donan, Jr. David C.
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