Roof bolts

Details Roof bolts Roof bolts

1992-04-07

1993-08-10

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

405258, 411 3, 411417, 470 10, E21D 2102

Patent

active

052342913

ABSTRACT:
The roof bolt tendon comprises a length of square twist steel with a partial thread formed directly thereon over at least part of its length. The partial thread, which may extend for the full length of the tendon and which is preferably formed by rolling, is composed of thread portions formed at the corners of the square cross-section of the square twist steel. A roof bolt in which the tendon is employed is also disclosed.

REFERENCES:
patent: 250134 (1881-11-01), Coy
patent: 332359 (1885-12-01), Paine
patent: 1327934 (1920-01-01), Alcock
patent: 2562516 (1951-07-01), Williams
patent: 3218656 (1965-11-01), Reiland
patent: 3460428 (1969-08-01), Charles
patent: 4247224 (1981-01-01), Killmeyer
patent: 4325657 (1982-04-01), Elders
patent: 4630971 (1986-12-01), Herbst et al.
patent: 4971493 (1990-11-01), Herbst et al.
Automatic Machining, pp. 46-47, Jul. 1957.

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