Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1980-01-23
1981-11-10
Purser, Ernest R.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
91170MP, E21D 1544
Patent
active
042995175
ABSTRACT:
The mine roof supporting structure comprises hydraulic props (3) which are pressing a swivelling cap (8) against the mine roof. A link lever (5) is pivotally linked to the floor frame (1) and a shield (4) is pivotally linked to the link lever (5) and to the cap (8). The shield (4) is pulled in direction to the floor frame (1) by means of a hydraulic tension strut (14). The working chamber (24) of the tension strut (16), which working chamber includes the piston rod and is facing the pivotal point (12) of the tension strut (16) to the shield (4), can be brought in connection with the supply conduit (19) for feeding pressurized fluid to the props (3) via a spring loaded check valve (22, 23), noting that the opening pressure of the spring (22) is smaller than the final supporting pressure exerted by the props (3). The piston surface of the working chamber (24) is smaller than the piston surface (4) delimiting the working chamber of the props (3). A change-over valve (25) is provided for connecting in one position the supply conduit (19) and in the other position a separate conduit (28) for pressurized fluid with the hydraulic tensions strut (14), noting that in the other position the connection between the conduit for pressurized fluid and the working chamber (21) of the props is closed (FIG. 3).
REFERENCES:
patent: 3898845 (1975-08-01), Plevak et al.
patent: 3915500 (1975-10-01), Schlusener et al.
patent: 4020640 (1977-05-01), Sigott et al.
patent: 4037419 (1977-07-01), Hill et al.
Siebenhofer Gottfried
Suessenbeck Heinrich
Zitz Alfred
Purser Ernest R.
Voest-Alpine Aktiengesellschaft
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