Dual thrust anchor shell assembly

Details Dual thrust anchor shell assembly Dual thrust anchor shell assembly

1981-07-27

1983-04-19

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

411 25, 411 27, 411 33, E21D 1100

Patent

active

043804071

ABSTRACT:
A dual thrust anchor shell assembly for use with mine roof bolts or rock bolts include first and second opposed pivotal upper wing elements and first and second opposed, pivotal lower wing elements disposed about a mine roof bolt between a movable upper nut and a fixed lower nut so that tightening of the roof bolt forces the upper wing elements downward toward the lower wing elements. The upper wing elements each have a plurality of sloped camming surfaces. The lower wing elements also each have a plurality of sloped camming surfaces that engage camming surfaces of the upper wing elements as the roof bolt is tightened. Tightening of the roof bolt first causes the upper wing elements to pivot outward and dig into the walls of a roof bolt hole, anchoring the upper wing elements. Further tightening of the roof bolt causes a roof plate to be drawn tightly against the mine roof, binding strata of the mine roof and reinforcing the mine roof. Still further tightening of the roof bolt, if necessary, causes outward pivoting of the lower wing elements, further anchoring the dual thrust anchor shell assembly in the roof bolt hole.

REFERENCES:
patent: 703796 (1902-07-01), Lakhovsky
patent: 2918840 (1959-12-01), Roesler
patent: 2950602 (1960-08-01), Lang
patent: 4187757 (1980-02-01), Frischmann et al.

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