Rock formation support plate

Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor

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411531, E21D 2100

Patent

active

044988150

ABSTRACT:
A load-bearing support plate for use in coal mines or other such excavations to be held in supporting engagement with the roof or walls of the excavation by an elongated bolt or rod anchored in a blind drill hole. The plate is preferably rectangular in outer periphery with a central opening for passage of the bolt or rod. It is formed from an initially flat piece of sheet steel, embossed in certain areas by a die to push portions of the metal away from the side of the plate which contacts the load-bearing qualities of the plate. The pattern includes a plurality of elongated, parallel identations in the rock-engaging surface of the plate, with the portion surrounding the central opening remaining in the plane of the original metal. Preferably, at least one on each side of the central opening; various modifications of the embossed pattern are disclosed within the general scope of the invention.

REFERENCES:
patent: D236428 (1975-08-01), Stewart et al.
patent: 2854824 (1958-10-01), Curry et al.
patent: 4037418 (1977-07-01), Hannan
patent: 4112693 (1978-09-01), Collin et al.
patent: 4189891 (1980-02-01), Johnson et al.
patent: 4249835 (1981-02-01), White
patent: 4371293 (1983-02-01), Wilcox et al.

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