Mine roof supports

Details Mine roof supports Mine roof supports

1983-09-21

1985-08-13

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405302, E21D 1544

Patent

active

045346810

ABSTRACT:
A mine roof support has a main roof-engaging structure 2 carried by hydraulic props 6 in known manner and an auxiliary roof-engaging structure at the front end of the main roof engaging structure. The auxiliary roof-engaging structure can be swung up and down and is itself of multi-part construction with one component 7 directly linked to the main structure and another selectively extendible forward component 8 mounted to the one component. One hydraulic piston and cylinder unit 9 is provided for swinging the auxiliary structure and for setting the structure against the roof and another such unit 10 is provided for selectively extending and retracting the forward component thereof. A hydraulic control arrangement 16-18 associated with the units ensures that when the forward component is being advanced the roof setting pressure acting on the auxiliary structure is automatically reduced.

REFERENCES:
patent: 3534559 (1970-10-01), Seddon et al.
patent: 4306822 (1981-12-01), Weirich et al.
patent: 4411558 (1983-10-01), Rutherford

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