Mine roof support unit

Details Mine roof support unit Mine roof support unit

1981-09-16

1984-08-14

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405299, E21D 2308

Patent

active

044654065

ABSTRACT:
A mine roof support unit has a roof bar supported on a floor sill by hydraulic props. The floor sill is constituted by a face-side floor sill part and a goaf-side floor sill part. The two floor sill parts are telescopically interconnected. Each of the floor sill parts supports a pair of hydraulic props. Hydraulic rams are provided for moving each of floor sill parts relative to the other floor sill part in the direction of roof support unit advance.

REFERENCES:
patent: 4231684 (1980-11-01), Oppenlander et al.

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