Self advancing support chocks
AssigneeMines de Potasse d'Alsace S.A.
InventorPierre Deffontaine
Life of this patent
Estimating the term…
Abstract
A self-advancing chock for supporting the roof of the gallery of a mine near the working face utilizing one or more lever arms articulated to the forward portion of a base (nearer the working face) and to the rear portion of a roof-supporting cap. The cap has sufficient area to cover the other elements of the chock in all positions of the lever arms and may have a slightly concave upper surface. If two lever arms are used they may be rigidly or flexibly interconnected and the cap may be in two sections for use with sloping or irregular roof areas. The base element may also be in two sections.
Claims14
A self-shielding support chock for use in mine galleries proximate the mining face in mines having horizontal or moderately dipping veins comprising:
- a base;
- a cap for interacting with the upper surface of the vein, said cap having sufficient area to cover the other elements of the chock when said cap is interacting with said upper surface;
- at least one lever arm articulated at one end at a first articulation point on said base toward the front thereof in the direction of the mining face and articulated at the other end at a second articulation point on said cap toward the rear thereof away from the mining face;
- and
- a prop supported on said base, one end of said prop being in engagement with said at least one lever arm, said pro containing means for raising and lowering said at least one lever arm.
Dependencies are inferred from the claim text.