Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1992-04-03
1993-03-02
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405297, 405299, E21D 2310
Patent
active
051904144
ABSTRACT:
A walking mining prop has a skid-lifting assembly in the region of the ram which braces the roof cap with respect to the skid formed by a bridge from which lifting cylinders are articulated and suspended. The pistons of these lifting cylinders are articulated to a pressure plate which at least partly surrounds the guide rods of a guide-rod assembly on which the skid is guided, a mechanism being provided to advance the skid relative to the guide-rod assembly.
REFERENCES:
patent: 3811288 (1974-05-01), Wehner et al.
patent: 4600340 (1986-07-01), Rosenberg
patent: 5039257 (1991-08-01), Bithell
patent: 5100263 (1992-03-01), Woodford et al.
Bemmerl Hans-Ferdinand
Bollmann Alfred
Kroninger Peter
Rose Peter
Scheunert Alois
Corbin David H.
Dubno Herbert
Strebtechnik Bochum GmbH & Co.
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