Mine roof supports

Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention

Patent

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Details

E21D 1702

Patent

active

041249844

ABSTRACT:
A mine roof support embodying a roof engaging cover and a forepole. The cover is composed of a leading part and a trailing part relatively adjustable with respect to one another. A base member is provided with a plurality of hydraulic rams engagable with said cover for raising and lowering same. The forepole is capable of being extended and retracted with respect to the leading part of the cover.

REFERENCES:
patent: 3240021 (1966-03-01), Meriaux et al.
patent: 3732699 (1973-05-01), Stevenson

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