Stabilized railway car truck

Claim 1

A STABILIZED CAR TRUCK INCLUDING A SIDE FRAME HAVING A BOLSTER WINDOW THEREIN, A BOLSTER HAVING A BOX END PORTION PROJECTING INTO SAID WINDOW AND FORMED WITH A WEDGESHAPED POCKET WHICH OPENS THROUGH ONE SIDE FACE AND THROUGH THE TOP AND BOTTOM WALLS OF SAID BOX END PORTION AND IS DEFINED BY PARALLEL SIDE WALLS AND A REAR WALL HAVING AN UPWARDLY AND OUTWARDLY INCLINED PORTION WHICH EXTENDS ABOVE AND BELOW THE TOP WALL OF THE BOLSTER, LOAD SPRINGS INTERPOSED BETWEEN THE BOLSTER AND A SUBJACENT PORTION OF SAID FRAME TO SUPPORT THE BOLSTER, EACH LOAD SPRING BEING OF SUCH LENGTH THAT IT CAN BE INSTALLED, WHEN FREE OF COMPRESSION, ONLY WHEN THE BOLSTER IS ELEVATED TO THE TOP OF THE WINDOW, MEANS FOR DAMPING THE VERTICAL OSCILLATIONS OF SAID LOAD SPRINGS COMPRISING A WEDGE POSITIONED IN SAID POCKET AND HAVING AN INCLINED FACE IN WEDGING ENGAGEMENT THROUGHOUT ITS LENGTH AT ALL TIMES WITH THE INCLINED PORTION OF THE REAR WALL OF SAID POCKET INCLUDING THE PORTION THEREOF EXTENDING ABOVE THE TOP WALL OF THE BOLSTER AND HAVING ALSO A VERTICAL FACE FRICTIONALLY ENGAGING AN OPPOSING VERTICAL FACE OF THE SIDE FRAME, AND A WEDGE SUPPORTING HELICAL SPRING REACTING BETWEEN SAID WEDGE AND A SUBJACENT PORTION OF THE SIDE FRAME; THE SAID WEDGE SPRING BEING SO ARRANGED THAT ITS LONGITUDINAL AXIS INTERSECTS THE MIDPOINT OF SAID INCLINED FACE OF WEDGE, WHEREBY THE HORIZONTAL THRUST OF THE WEDGE IS SUBSTANTIALLY UNIFORMLY DISTRIBUTED TO AREAS OF THE INCLINED WALL AT LOCATIONS ABOVE AND BELOW SAID MIDPOINT OF SAID INCLINED FACE OF THE WEDGE TO PREVENT TURNING OF THE WEDGE IN SAID POCKET AND THEREBY INSURE UNIFORM WEAR ON THE BOLSTER AND ON THE FRICTION FACE OF THE WEDGE, AND THE PORTION OF THE FRAME DEFINING THE TOP OF THE BOLSTER WINDOW BEING FORMED WITH AN OPENING FOR RECEIVING THE UPPER END PORTION OF THE WEDGE AND THE EXTENDED UPPER END PORTION OF THE INCLINED REAR WALL OF SAID POCKET WHEN THE BOLSTER IS ELEVATED TO THE UPPER END OF THE BOLSTER WINDOW.