Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1978-04-19
1979-02-20
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
E21D 1544
Patent
active
041404300
ABSTRACT:
A walking mine roof support has a roof engaging cap element, two supporting units each including a floor engaging plate member and a prop extending between a respective one of the plate members and the roof supporting cap element so as to support the latter, which floor engaging plate members are displaceable in a first direction toward a mine face and are spaced from one another in a second direction transverse to the first direction, and displacing elements for displacing the floor engaging plate members in the first direction and including two guiding elements spaced from one another in the second direction and two hydraulic cylinder-piston units operative independently of one another. Each of the hydraulic cylinder-piston units connects one of the guiding elements with a respective one of the floor engaging plate members so as to displace the latter relative to but independently of one another in the first direction.
REFERENCES:
patent: 3434292 (1969-03-01), Heyer
patent: 3482878 (1969-12-01), Floter
patent: 3490243 (1970-01-01), Groetschel
patent: 4027489 (1977-01-01), Walker et al.
Bemmerl Hans-Ferdinand
Blumenthal Gunter
Bochumer Eisenhutte Heintzmann GmbH & Co
Striker Michael J.
Taylor Dennis L.
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