Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1983-05-19
1988-03-22
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405291, E21D 2304
Patent
active
047325119
ABSTRACT:
A mine roof support includes a pair of substantially-parallel floor-engaging members, a roof engageable member, a shield pivotally-connected to the floor-engaging members, by at least one pair of parallel links, and pivotally-connected to the roof-engageable member, and prop means carried by the floor-engaging members by which the roof-engageable member can be urged into engagement with a mine roof. A strengthening member connects the pair of parallel links. The strengthening member and the pair of parallel links provide the sole connection between the rear-end portions of the floor-engaging members by which the forces tending to cause relative displacement of those rear-end portions in the vertical direction are substantially resisted.
REFERENCES:
patent: 4048804 (1977-09-01), Elsner et al.
patent: 4231684 (1980-11-01), Oppenlander et al.
Corbin David H.
Dowty Mining Equipment Ltd.
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