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Railway hopper car with bottom door discharge mechanism

  • US 3,994,238 A
  • Filed: 06/27/1975
  • Issued: 11/30/1976
  • Est. Priority Date: 06/27/1975
  • Status: Expired due to Term
First Claim
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1. In a railway hopper car having a body structure and a hopper bottom dump door means movable between closed and open positions for discharging material from said hopper,door actuating mechanism including an L-shaped arm pivotally mounted on each hopper for pivotal movement about a longitudinal axis,said arm including an upright portion and a laterally extending portion,said door means including a door pivoted on said hopper for downward movement to an open position,means connecting said laterally extending arm portion to said door whereby during pivotal movement of said arm in one direction said door is opened and when pivotally moved in an opposite direction said door is closed, the improvement comprising;

  • a cam engaging member connected to said arm and projecting outwardly with respect thereto,a cam edge on said member,an opening cam positioned adjacent the railway on which said car is moving,said cam including a cam surface engaged by said cam edge during car movement whereby said cam engaging member is moved to pivot said arm in said one direction,a closing cam spaced longitudinally from said opening cam having a cam surface engaged by said cam edge during continued car movement to pivot said arm in said opposite direction to close said door,a releasable lock mechanism supported on said hopper for locking said door in said closed position including,a lock element movable into and out of engagement with said arm for respectively locking and unlocking said arm against pivotal movement,a cam follower connected to said lock element,said cam follower being movably supported on said hopper,said follower being longitudinally spaced in front of said cam engaging member in the direction of movement of said car,whereby said follower engages said opening cam to unlock said lock element prior to said movement of said arm in said one direction by said engagement of said cam engaging member with said opening cam.

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