Hydraulic walking roof-support frame

Details Hydraulic walking roof-support frame Hydraulic walking roof-support frame

1978-05-09

1979-05-22

Shapiro, Jacob

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

E21D 1710

Patent

active

041556763

ABSTRACT:
An hydraulic walking roof-support frame for a coal mine has a roof support assembly comprising a main support and an auxiliary support pivotally connected to the main support for pivoting about a horizontal axis through an angle of 180.degree.. The auxiliary support is caused to pivot by a pair of hydraulically operated extensible and retractable jacks connected between the main support and the auxiliary support, the pivot points where the jacks are connected to the auxiliary support being angularly spaced apart relative to the axis of pivoting of the auxiliary support whereby when (during pivoting of the auxiliary support) one jack is in a "dead center" position the other jack can still pivot the auxiliary support permitting remote control thereof.

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