Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1980-02-06
1982-02-02
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405299, E21D 2300
Patent
active
043136982
ABSTRACT:
The invention is concerned with a hydraulic shield-type support for supporting roofs in mines comprising a pair of base slides between which is located a channel-section guide beam supporting an hydraulic ram. At the rear end of the hydraulic ram a yoke is pivotally connected at a central part thereof to the rear end of the guide beam, the two outer portions of the yoke being pivotally connected to the rear end portions of the base slides. The front extendable end of the ram is connected to an elongate flat tongue which is longitudinally slidable in the guide beam underneath the hydraulic ram.
REFERENCES:
patent: 4028898 (1977-06-01), Blumenthal et al.
patent: 4048804 (1977-09-01), Elsner et al.
patent: 4147459 (1979-04-01), Koppers
Maykemper Alfred
Schorradt Gerhard
Werth Gunter
Corbin David H.
Hermann Hemscheidt Maschinenfabrik GmbH & Co.
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