Railway hopper car with bottom door discharge mechanism
Patent 3994238 Issued on November 30, 1976. Estimated Expiration Date: 
November 30, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 30, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3452886 3459317 3474920 3872796 InventorAssigneeApplicationNo. 591190 filed on 06/27/1975US Classes:105/241.2, Actuated by means external to car105/299, Crank and link105/304, Toggle or strut414/387Means comprises device or structure for cooperating with motion of vehicle to initiate relocation of body component (e.g., floor or floor section, gate, etc.) thereofExaminersPrimary: Kunin, Stephen G.Assistant: Sotelo, Jesus D. Attorney, Agent or FirmAbstractA bottom door discharge mechanism for a railway hopper car includes a bell crank arm for each of the doors located in pairs at the bottom of the hopper. The arms are tripped from track side cams on opposite sides of the car for movement to open and closed positions. A safety locking mechanism is provided which during transit positively locks the arms against rotation to an open position. The locking mechanism includes arms or cam followers which are actuated from the track side opening cam thereby disengaging said locking mechanisms just prior to engagement of a second cam follower with said track side cam whereupon the bell crank levers are actuated to move the doors to their open position.Other References
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