Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1977-02-04
1978-11-21
Shapiro, Jacob
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
E21D 1544
Patent
active
041260023
ABSTRACT:
A mine roof support comprising a floor-engaging member, one or more shielding members above the floor-engaging member, a flap pivotally mounted on the or on a shielding member and a sealing member pivotally mounted on the flap.
REFERENCES:
patent: 3800546 (1974-04-01), Holken et al.
patent: 3903703 (1975-09-01), Lubojatsky
patent: 4020640 (1977-05-01), Sigott et al.
Sutton James A.
Walker John H.
Dowty Mining Equipment Limited
Shapiro Jacob
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