Scraper chain conveyor

A scraper chain conveyor comprising a supporting trough defining a bottom plate, side walls and intermediate guides provided on said bottom plate, a conveying chain assembled of ring-shaped chain elements arranged substantially perpendicularly to the bottom plate, flat chain elements arranged substantially parallel to said bottom plate, and of scraping elements, said flat chain elements being guided between said intermediate guides and being linked to said ring-shaped elements with a play sufficient to permit sliding motion of respective chain elements in the longitudinal direction of the chain, said scraping elements being shaped to enclose with a predetermined play the contour of the adjoining flat chain elements, and at least one driving unit arranged between said side walls of said trough and including a chain wheel drivingly engaging said flat chain elements, said conveyor chain being a double chain having two parallel sets of said ring-shaped chain elements connected by said flat chain elements with a play sufficient to permit said longitudinal sliding motion without any self-locking effect, said flat chain elements being provided in the range of said ring-shaped chain elements with oblong holes for accommodating the latter and with a central hole for engaging said chain wheel.