Roof support unit

Details Roof support unit Roof support unit

1979-01-02

1980-11-04

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405299, E21D 1544

Patent

active

042316855

ABSTRACT:
A roof support unit for use in a mineral mining working has a roof shield supported on a floor sill by means of at least two hydraulic props. A goaf shield is pivotally linked to both the roof shield and the floor sill. At least one of the hydraulic props is inclined towards the face-side of the unit and engages the roof shield. At least one of the hydraulic props is inclined towards the goaf-side of the unit and engages the roof shield.

REFERENCES:
patent: 4065930 (1978-01-01), Spies
patent: 4094155 (1978-06-01), Blumenthal et al.
patent: 4132081 (1979-01-01), Walker et al.
patent: 4140430 (1979-02-01), Blumenthal et al.

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