Canopy and shield structure for a supporting shield in a seam-li

Details Canopy and shield structure for a supporting shield in a seam-li Canopy and shield structure for a supporting shield in a seam-li

1977-02-02

1979-01-30

Stein, Mervin

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

299 11, 405296, E21F 506

Patent

active

041369998

ABSTRACT:
A canopy and shield structure for supporting a shield adjacent a working face in a seam-like mine deposit, comprises a floor skid which is connected through an extensible and contractable prop at the working face end to the working face end of a canopy adapted to be positioned in parallel relation to the roof strata. The working space is covered at the waste removal end by a shield which includes a lower two-arm lever portion which is pivotally mounted on the skid and an upper portion which is pivotally connected to the longer arm of the two-arm lever adjacent the upper end thereof and is also pivotally connected to the canopy. The two-arm lever is driven by a hydraulic drive motor and a parallel linkage is connected between the upper shield part and the canopy in order to provide a guidance of the canopy in a direction substantially perpendicular to the strata. The upper part of the shield also includes an opening for the passage of a blast pipe and the canopy advantageously includes a guideway for supporting the blast pipe for shifting movement toward and away from the working face.

REFERENCES:
patent: 3874178 (1975-04-01), Kunzer
patent: 3928981 (1975-12-01), Parker et al.

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