Mine roof support unit

Details Mine roof support unit Mine roof support unit

1984-12-31

1986-07-15

Husar, Cornelius J.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405299, E21D 1552, E21D 2300

Patent

active

046003401

ABSTRACT:
A mine roof support unit includes a pair of generally parallel floor girders, and an advance mechanism positioned between the floor girders. The advance mechanism comprises a hydraulic advance ram and a guide rod system. The advance ram is pivotally connected between the guide rod system and a cross member which interconnects the floor girders. The guide rod system is attachable to a longwall conveyor positioned adjacent to a work face. The cross member is engageable with the floor girders in such a manner that the floor girders are relatively displaceable in a vertical direction. Each of the floor girders is provided with a respective hydraulic lifting ram, the arrangement being such that the lifting rams can be operated to lift one of the floor girders relative to the other floor girder.

REFERENCES:
patent: 3218812 (1965-11-01), Wilkenloh
patent: 3640581 (1972-02-01), Rassman et al.
patent: 3748861 (1973-07-01), Groetschel
patent: 3811288 (1974-05-01), Wehner et al.
patent: 3915500 (1975-10-01), Schlusener et al.
patent: 3990251 (1976-11-01), Wehner et al.
patent: 4102139 (1978-07-01), Wake
patent: 4139325 (1979-02-01), Bower et al.
patent: 4217067 (1980-08-01), Lagodka et al.
patent: 4311417 (1982-01-01), Bower et al.
patent: 4379661 (1983-04-01), Wojaczek et al.

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