Shield supports suitable for use in mines

Details Shield supports suitable for use in mines Shield supports suitable for use in mines

1985-02-05

1986-12-16

Husar, Cornelius J.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405291, E21D 1544, E21D 1900

Patent

active

046293680

ABSTRACT:
A shield support, suitable for use in mines, comprising a floor-engaging structure, a roof-engageable canopy, extendible and contractible prop means disposed between the floor-engaging structure and the canopy, and a shield assembly pivotally-connected to the canopy at or near its rearward end portion. The shield assembly includes a lazy tongs linkage, one element of which is pivotally-connected directly to the floor-engaging structure and another element of which is pivotally-connected to the floor-engaging structure through the intermediary of a further element.

REFERENCES:
patent: 4048804 (1977-09-01), Elsner et al.
patent: 4197035 (1980-04-01), Siebenhofer et al.

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