Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1979-02-14
1981-10-06
Holko, Thomas J.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
405303, 411373, 411548, A47G 300, E21D 2100
Patent
active
042932432
ABSTRACT:
A guard for a mine roof bolt assembly is disclosed. The guard consists of a cap having a cavity into which the mine roof bolt head is inserted. The cavity wall includes serrations which grip the bolt head and secure the guard on it. A continuous annular skirt depends from the cap and extends outward to completely cover the bolt plate. The skirt curves in the radial direction towards the plate so that the guard presents a substantially smooth curved surface to a passing miner. The skirt includes cut-outs corresponding to the positions of hanger loops on the bolt plate. The guards may also include luminescent or colored material.
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"Slide Fastener" Brochure from Steck Manufacturing Co. of Dayton Ohio, 1956, 2 pages.
Cox Joseph V.
Graybeal Carl N.
Rogers Basil E.
Rogers Roy R.
Graybeal Carl N.
Holko Thomas J.
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