Control device for mine-roof support

Details Control device for mine-roof support Control device for mine-roof support

1993-12-20

1995-03-28

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Ground stabilization or reinforcement

405296, 91170MP, E21D 2316

Patent

active

054011230

ABSTRACT:
The control device is adapted to be inserted between the control valves of a pilot device and the pressure-medium consumers (hydraulic prop and hydraulic working cylinder) in an hydraulic self-advancing mine-roof support and is connected to a pressure-medium line and to a return line. The control device comprises a valve block with continuous longitudinal bores for connection to a multiple tubing line leading to the pilot device, the valve block having bores for receiving piloted 3/2-way valves and bores for connection to the directly-controlled working cylinders of the mine-roof support.

REFERENCES:
patent: 4225271 (1980-09-01), Nerlich
patent: 4247226 (1981-01-01), Weirich
patent: 4657443 (1987-04-01), Blumenthal
patent: 4692067 (1987-09-01), Ward et al.

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