Conveyor trough, particularly for scraper chain conveyors

A conveyor trough particularly for scraper chain conveyors, comprising a plurality of transversely extending interconnected plates with adjacent plates having engaging edges and with alternately arranged projecting tongues and recesses which, together define a hinged connection between longitudinally adjacent plates, each of said plates having one engaging edge with an underlying coupling tongue disposed at a low level at each side of an overlying coupling tongue disposed at a level over said underlying tongue, and an opposite edge with an overlying coupling tongue on each side of an underlying coupling tongue, said overlying tongues engaging over corresponding ones of said underlying tongues, said tongues being sized to leave a clearance therebetween both vertically and horizontally to permit some vertical and some horizontal angling between said plates, each of said plates being substantially flat and having top and bottom faces, each plate having at least one recess on its top face forming one of said underlying tongues and a recess on its bottom face forming one of said overlying tongues said recesses being offset from each other across the engaging edges of each plate, each overlying tongue having an underlying tapered face extending from an inner end face which is perpendicular to said bottom face, upwardly to an outer end face which is perpendicular to said top face and each underlying face having an upper tapered face which extends from an inner end face extending perpendicularly to said top face downwardly to an outer end face which is perpendicular to said bottom face.