Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1979-11-28
1981-10-06
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405295, E21D 1544
Patent
active
042932475
ABSTRACT:
A mine roof support has a roof-engaging frame structure supported by hydraulic props on a floor frame and pivotably linked to a goaf shield. The roof frame and goaf shield have L-shaped seal plates at their sides. The seal plates are subjected to a lateral-outwardly-biasing spring force by means of springs and push rods accommodated in guide bores in both the roof frame and goaf shield. To adjust the distance between the plates, there are piston and cylinder units and coupling rods likewise accommodated in guide bores in both the roof frame and goaf shield. The seal plates of the roof frame overlap with those of the goaf shield. The plates are reduced in thickness at their overlapping regions and are pivotably interconnected thereat to correspond to the pivotal connection between the roof frame and the goaf shield. To facilitate assembly in situ, detachable push-in pins are located in bores in the coupling rods and push rods and in lower transverse walls of both the roof frame and goaf-shield. The pins fix the seal plates in a set position with clearance between the overlapping regions of the plates.
REFERENCES:
patent: 1923123 (1933-08-01), Stahlecker
patent: 3090600 (1963-05-01), Smith
patent: 3739586 (1973-06-01), Wehner et al.
patent: 3837170 (1974-09-01), Martinko et al.
patent: 3911686 (1975-10-01), Becker et al.
Holken Norbert
Rosenberg Harry
Gewerkschaft Eisenhutte Westfalia
Taylor Dennis L.
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