Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1990-05-11
1991-08-13
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405295, 405298, 405299, E21D 2304, E21D 1544
Patent
active
050392573
ABSTRACT:
Mine roof support comprising a base including a pair of skids, a roof engaging canopy, jacks acting between the base and the canopy, an auxiliary jack connected to the base for lifting or lowering at least part of the base when the support advances and a lost motion arrangement connected between the base and the auxiliary jack for aiding movement of the base and the roof engaging canopy toward each other. The lost motion arrangement is connected to each of the skids by a pivotal connection which permits the front end of one skid to move vertically to a limited extent with respect to the front end of the adjacent skid.
REFERENCES:
patent: 4217067 (1980-08-01), Lagodka et al.
patent: 4940363 (1990-07-01), Brown et al.
Gullick Dobson Limited
Ricci John A.
Taylor Dennis L.
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