Hydraulic walking roof-support frame

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

1978-06-23

1979-05-22

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405293, E21D 1544

Patent

active

041556755

ABSTRACT:
A hydraulic, walking, roof-support frame comprising a vertically-movable, pivotable control lever pivotally connected at its lower end portion to a rigid inextensible rocker arm pivotally mounted on a floor runner or skid of the frame and guided at a distance therefrom by a second rocker arm disposed nearer the coal-face end of the frame and pivotally connected to the floor runner and to the control lever, the free or coal-face end of the control lever being pivotally connected to a roof bar or plate pivotably born by hydraulic vertically-adjustable props, in which the said second rocker arm is longitudinally adjustable and is so constructed that it can be held at a predetermined intermediate length between pivots at its ends to enable its length to be changed in either direction as a result of a thrust from the roof.

REFERENCES:
patent: 3885396 (1975-05-01), Snowden et al.
patent: 3898845 (1975-08-01), Plevak et al.
patent: 3915500 (1975-10-01), Schlusener et al.

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