Advance mechanism for a mine roof support unit

Details Advance mechanism for a mine roof support unit Advance mechanism for a mine roof support unit

1980-09-09

1983-04-12

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405291, E21D 2308

Patent

active

043796613

ABSTRACT:
A roof support unit has a pair of spaced floor girders and an advance mechanism comprising a hydraulic advance ram and a pair of relay rods connected, at one end, to a head-piece which is attached to a longwall conveyor. The other ends of the relay rods are attached to a guide element which is slidably guided by a pair of guide rails attached to the mutually-facing sides of the floor girders. The hydraulic advance ram is pivotally attached to the guide element and to the floor girders. Means are provided for aligning the ends of the floor girders remote from the head-piece when the hydraulic advance ram is pressurized.

REFERENCES:
patent: 3925995 (1975-12-01), Harmsma
patent: 3991580 (1976-11-01), Allen
patent: 4028898 (1977-06-01), Blumenthal
patent: 4075857 (1978-02-01), Elsner et al.
patent: 4217067 (1980-08-01), Lagodka et al.
patent: 4227833 (1980-10-01), Plester et al.
patent: 4231685 (1980-11-01), Rosenberg et al.

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