Stilts for use in mine workings

Details Stilts for use in mine workings Stilts for use in mine workings

1975-09-22

1976-11-30

Staab, Lawrence J.

Supports

Props and braces

Adjustable length

188 1C, E04G 2500

Patent

active

039944670

ABSTRACT:
A yieldable mining stilt comprises a tube formed with diammetrically opposite, longitudinally extending slots. A bar spans the tube and has its end portions engaged in the slots. The relative dimensions of the end portions of the bar and of the slots are such that movement of the bar along the slots causes deformation of the tube adjacent to the slots. In use, the bar supports the leg of a roof arch. There may be two bars, one above the other, the upper one reversing the deformation caused by the lower one.

REFERENCES:
patent: 3492888 (1970-02-01), Nishimura et al.
patent: 3856328 (1974-12-01), Koizumi

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