US Patent 11649597 Self-propelled street cleaner

A self-propelled sweeping machine, having a chassis comprising at least one driven drive axle with wheels, for cleaning drivable, preferably solid, ground surfaces such as roads, streets, paths and cycle paths, squares or the like, consists of a refuse collection container which is built onto the chassis for receiving refuse which is lifted from the ground surface by means of generated suction air and/or suction force of a suction air unit comprising a suction air blower, by a suction device provided at the front end of a suction air line, and which is supplied via the connected, preferably rising, suction air line to the interior of the refuse collection container, wherein the refuse collection container has a screening device which is arranged spaced apart from the upper container wall for separating the refuse and, for conducting the suction air, has a downstream air outlet line for the suction air to be discharged, and wherein for the emptying process the refuse collection container is configured at the rear end so as to be pivotable about a horizontal axis arranged transversely to the forward direction of movement, and for emptying refuse the inner face of the rear wall of the refuse collection container is configured as a sliding surface which rises, respectively is inclined, to the rear, wherein the suction air unit, which is line-connected by a suction air opening to the interior of the refuse collection container, is arranged on the outer face of the rear wall of the refuse collection container configured with an internal sliding surface.