Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1993-01-28
1993-11-09
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
4052591, 4053022, E21D 2102
Patent
active
052597032
ABSTRACT:
A passive-type mine roof bolt is constructed of multi strand steel cable. The bolt head is constructed of a hexagonal- or other drive-headed collar having an internally tapered funnel-shaped bore therethrough, and a tapered plug having a frusto-conical outer surface that engages the funnel-shaped 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 steel cable, the hexagonal head drive collar fitting over the tapered plug such that pressing the tapered plug and steel cable into the inner funnel-shaped 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 rigid 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. A number of alternative embodiments enhance the bolt's retention strength in the bore hole to aid in stabilizing the rock formation.
REFERENCES:
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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), Stephen
patent: 4724639 (1988-02-01), Moser
patent: 4798501 (1989-01-01), Spies
patent: 4832534 (1989-05-01), Duvieusart
patent: 4884377 (1989-12-01), Matt
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