Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1979-08-01
1981-02-24
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405295, E21D 1544
Patent
active
042524776
ABSTRACT:
A mine roof support has a base and a roof shield pivoted to the base and carrying at its upper end a pivoted cap which is urged upwardly against the mine roof by a hydraulic pit prop reacting between the cap and the base. The lower end of the roof shield is connected to the base by two links each having a pivot cooperating with a pivot on the roof shield, and a pivot cooperating with a pivot on the base. In addition, the base and/or the lower end of the roof shield has an auxiliary for each link and each link has an auxiliary pivot which can be connected with one of the auxiliary pivots of the base or lower end.
REFERENCES:
patent: 3854293 (1974-12-01), Spies
patent: 3874178 (1975-04-01), Kunzer
patent: 3885396 (1975-05-01), Snowden et al.
patent: 4056941 (1977-11-01), Watermann
Bochumer Eisenhutte Heintzmann GmbH & Co.
Corbin David H.
Striker Michael J.
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