Pit prop with liftable front end

Details Pit prop with liftable front end Pit prop with liftable front end

1976-08-31

1977-08-16

Taylor, Dennis L.

Supports

Pipe or cable

Extending through plate

248357, E21D 1544

Patent

active

040417158

ABSTRACT:
A pit prop has a floor-engaging foot, at least one arm pivoted at the rear of this foot and extending forwardly, a roof-engaging shield carried at the front end of this arm, and at least one ram extending vertically between the arm and the foot for pressing the shield against the roof and the foot against the floor. A hydraulic ram has its rear end pivoted at the rear end of the foot and its front end pivoted on the rear end of a rigid link whose front end in turn is pivoted on the face conveyor. The rear end of this link is slidable in and pivoted on the foot. A second link has its front end pivoted on the rear end of the main link and its rear end bearing vertically down against the foot but slidable therealong. A short lifting ram has its rear end pivoted on the rear end of the second link and its front end pivoted on the rear end of the main link above the pivot for the other displacement ram pivoted on this link. Thus expansion of this lifting ram raises the front end of the foot of the pit prop off the floor.

REFERENCES:
patent: 3276819 (1966-10-01), Lobbe et al.
patent: 3649078 (1972-03-01), Grebe et al.
patent: 3874734 (1975-04-01), Plevak et al.
patent: 3915500 (1975-10-01), Schlusener et al.

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