Lemniscate mining supports

Details Lemniscate mining supports Lemniscate mining supports

1988-03-18

1989-08-15

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

E21D 2304

Patent

active

048569402

ABSTRACT:
This invention relates to a lemniscate mining support comprising a foot piece, a roof bar, an anti-fall shield connected between the foot piece and the roof bar, and movable props between the roof bar and the foot piece so as to move the roof bar. The joints connecting the anti-fall shield to the foot piece and the anti-fall shield to the roof bar are positioned so that the anti-fall shield can be positioned at a steep angle, relative to the roof bar so that damage to the anti-fall shield can be minimized while allowing the anti-fall shield to contribute to the support of the roof bar.

REFERENCES:
patent: 4037419 (1977-07-01), Hill et al.
patent: 4269546 (1981-05-01), Saunders
patent: 4708531 (1987-11-01), Plenter

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