Control device for railway hopper car trapdoors, hoppers fitted therewith

摘要

1. A control device for the trapdoor (6) of a hopper (4) of a car during the stages of the operating cycle of the trapdoor, i.e. the control of the closure of the trapdoor, the said cycle more particularly comprising the stages for maintaining the trapdoor (6) in the open position, then for releasing the trapdoor and for controlling the closure, the said control device comprising a means (20) for maintaining the trapdoor in the open position, a means (21) for releasing the said trapdoor, and a means (8) for controlling the closure of the said trapdoor, which is pivotable about an axis (7), which is fixed relative to the chassis (3) of the car, the said control device being characterised in that the means (20) for maintaining the trapdoor (6) in the open position is selected such that its maintaining action may be cancelled by means of a single oscillation of a part (22), and it makes the oscillation of the said part (22) necessary for the release of the trapdoor (6), whereas, when it returns into the position for maintaining the trapdoor open, the said means guides the said part (22) back into the position in readiness for the subsequent release command.