Mine roof supports
AssigneeFletcher Sutcliffe Wild Limited
InventorArthur Scarfe
Life of this patent
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Abstract
A mine roof support comprises a plurality of hydraulically extensible chock legs attached at their upper ends to one or more elongate roof bars by means of a projection on each chock leg passing through an aperture in the underside of the roof bar(s) to be located in articulated manner in any one of a plurality of positions along the roof bar(s) and within the roof bar(s) by abutment means.
Claims21
A mine roof support comprising a hydraulically extensible chock leg, an elongated roof bar supported by the upper end of said leg, means for attaching said upper end to said bar including a projection on said upper end of said leg, and abutment means defining a plurality of apertures along the underside of the roof bar, said projection to be adjustably located in an articulated manner in any one of said plurality of apertures, said abutment means being positioned to define said apertures and retain said projection.
Dependencies are inferred from the claim text.