Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1992-03-23
1993-07-27
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
4052591, 4052595, E21D 2100, E21D 2002
Patent
active
052305899
ABSTRACT:
An improved mine roof bolt is constructed of pre-tensioned, multi-strand steel cable. The bolt head is constructed of a hexagonal-or other drive-headed collar having an internally tapered frusto-conical bore therethrough, and a tapered plug having a frusto-conical outer surface that engages the frusto-conical inner surface of the drive collar. The tapered plug has an internal bore essentially concentric with the outer frusto-conical surface, and is adapted to fit over the multi-stranded steel cable, the hexagonal head drive collar fitting over the tapered plug such that pressing the tapered plug and steel cable into the inner frustoconical bore of the hexagonal-head drive collar causes serrations on the internal bore of the tapered plug to be urged down against, and bite into, the steel cable, resulting in a solid hexagonal head for the cable bolt. The tapered plug is in actuality, a pair of essentially identical diametrically opposed semi-frusto-conical tapered sections that more easily compress together to bite into the multi-strand steel cable. The improved mine roof bolt is intended for use in passive-type mine roof systems.
REFERENCES:
patent: 2850937 (1958-09-01), Ralston
patent: 3650112 (1972-03-01), Howlett et al.
patent: 4140428 (1979-02-01), McLain et al.
patent: 4449855 (1984-05-01), Langwadt
patent: 4648753 (1987-03-01), Stephan
patent: 4798501 (1989-01-01), Spies
patent: 4832534 (1989-05-01), Duyieusart
patent: 4884377 (1989-12-01), Matt
McCully Michael D.
Taylor Dennis L.
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