Roof bolt anchor

Details Roof bolt anchor Roof bolt anchor

1985-02-19

1986-12-02

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

411 33, 411 47, 411 67, E21D 2100

Patent

active

046261397

ABSTRACT:
A mine roof bolt expansion anchor utilizes a plurality of transversely bent elongated leaves which are compressed within a bail by the rotation of the roof bolt. The compression results in movement of the leaves toward a flattened position whereby the outer edges of the leaves engage the bore hole walls to anchor the bolt. Downwardly extending flanges on each end of the leaves increase the bearing surface which engages the bore hole wall, while spacers near the center of the leaves act as a spine to evenly distribute the compression to all the leaves so that they all engage the bore hole wall simultaneously and with the same pressure.

REFERENCES:
patent: 1367080 (1921-02-01), Ogden
patent: 2783673 (1957-03-01), Lewis et al.
patent: 2950602 (1960-08-01), Lang
patent: 4147458 (1979-04-01), Elders
patent: 4295760 (1981-10-01), Warner

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