Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1979-09-20
1981-10-06
Novosad, Stephen J.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
E21D 1544
Patent
active
042932467
ABSTRACT:
A mine roof support structure includes a floor skid, a supporting shield pivotally connected thereto by a pair of rocker arms forming a lemniscate guide, a roof cap pivotally connected at a roof cap joint to the shield, and hydraulic props supporting the roof cap. A hydraulic actuator is pivotally connected at opposite ends to the skid and to one of the arms, and the other of the rocker arms is disposed nearer the coal-face end of the support than the one arm. Such other arm is longitudinally adjustable and is pivotally connected at opposite ends to the skid and to the shield. This other arm is so constructed that its opposite ends may be adjusted relative to one another to enable the cap and the roof cap joint to follow a lemniscate path during settling of the roof and to follow a circular arc during a lowering of the cap toward the skid upon actuation of the hydraulic actuator.
REFERENCES:
patent: 3915500 (1975-10-01), Schlusener et al.
patent: 3928981 (1975-12-01), Parker et al.
patent: 4037419 (1977-07-01), Hill et al.
patent: 4048804 (1977-09-01), Elsner et al.
patent: 4114387 (1978-09-01), Rutherford
patent: 4140430 (1979-02-01), Blumenthal et al.
patent: 4155675 (1979-05-01), Friedrichs
Boer Werner
Lachner Hans
Maschonat Guenter
Richter Joerg
Schulte Heinrich
Klockner-Werke AG
Novosad Stephen J.
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