BOUCLIER DE SOUTENEMENT HYDRAULIQUE POUR LES INSTALLATIONS DE REMBLAYAGE PNEUMATIQUE

摘要

An hydraulic shield assembly for use in material-discharging operations in mines, comprising a pivotally-mounted shield which can be raised and lowered by at least one hydraulic prop and which is surmounted by a roof-supporting beam or cap, in which the shield has a forward portion which is more steeply inclined to the horizontal than its rear portion so as to provide a space between that rear portion and the overlying rear portion of the roof-supporting beam or cap in which is supported a pipe for the discharge of material.