Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1977-09-23
1978-11-14
Stein, Mervin
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
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
Corbin David H.
Huwood Limited
Stein Mervin
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