Abstract: A scraper for removing debris from the floor of an animal stall is provided with a first motorized drum, a second motorized drum, a cable extending between the first and second drums, a scraper and a switch tripper carried by the cable. The switch tripper actuates a switch in communication with the first motorized drum to stop and reverse direction of the scraper and cable.

Abstract: A door opener mechanism for the side doors in a feed or grain elevator or conveyor in which the doors are hinged to the sides of the conveyor includes a crank arm pivotally connected to the conveyor at a point intermediate the side walls to provide rotation of the crank arm about a vertical axis. The crank arm is connected to the hinged doors by links and the crank arm is connected to a control arm by a link. The control arm is arranged to be connected to ropes for remote control of the door opening device. The control mechanism employed provides a relatively low profile, thus enabling placement of the conveyor and door opening mechanism close to a ceiling, which is desirable in places of limited space such as old barns.