Patent ID: 8256850
Filing Date: 2012-09-04
Classification: B61D,F15B,Y10T

Abstract:
1. A control device for controlling at least one bottom dump fluid pressure operated door for a railroad car movable between a closed position in which material within the railroad car is retained within the railroad car and an open position in which the material within the railroad car is released therefrom comprising: a housing supported by the railroad car; a piston movable in said housing in first and second directions between a door opening position and a door closing position in response to fluid pressure acting in a first direction on said piston to move said piston in its first direction to cause movement of the door to its open position and to fluid pressure acting in a second direction on said piston to move said piston in its second direction to cause movement of the door to its closed position; and a control arrangement including a control element movable between first and second positions in a direction substantially perpendicular to the direction of movement of said piston in its first and second directions, said control element engaging said piston when said control element is in its first position to prevent movement of said piston in its first direction in response to fluid pressure acting on said piston in the first direction, and said control element ceasing to prevent movement of said piston in its first direction when the railroad car is at a first predetermined position along a predetermined path at which said piston is to move to its door opening position to cause movement of the door to its open position.