Spring dampened bolster

Claim 1

IN A RAILWAY CAR TRUCK: (A) A SIDE FRAME AND A BOLSTER, SAID FRAME HAVING A COMPRESSION MEMBER AND A TENSION MEMBER JOINED BY A PAIR OF SPACED VERTICAL COLUMNS DEFINING THEREBETWEEN A BOLSTER-RECEIVING OPENING, SAID BOLSTER HAVING AN END PORTION DISPOSED WITHIN SAID OPENING FOR GUIDED VERTICAL MOVEMENT WITH RESPECT TO THE SIDE FRAME, AND EACH COLUMN HAVING A PAIR OF SIDE WALLS SPACED TRANSVERSELY RELATIVE TO THE LENGTH OF THE SIDE FRAME AND A REAR WALL BETWEEN THE SIDE WALLS SLOPING AWAY FROM SAID OPENING AND DEFINING A POCKET FOR RECEIVING A FRICTION WEDGE; (B) A WEDGE DISPOSED WITHIN EACH OF SAID POCKETS COMPRISING A PAIR OF TRANSVERSELY SPACED SIDE MEMBERS UNITED BY A REAR INCLINED WALL AND A FRONT VERTICAL WALL, SAID INCLINED WALL HAVING A SURFACE ENGAGING IN ROCKABLE RELATION SAID REAR SLOPING WALL, AND SAID FRONT WALL HAVING A VERTICAL SURFACE IN FRICTIONAL ENGAGEMENT WITH AN OPPOSING WEAR FACE OF THE BOLSTER, SAID VERTICAL SURFACE HAVING A TRANSVERSE DIMENSION SUBSTANTIALLY EQUAL TO THE DISTANCE BETWEEN THE OUTER SURFACES OF SAID SIDE MEMBERS, SAID WEAR FACE BEING HORIZONTALLY RECESSED TO DISPOSE A A PORTION FO SAID WEDGE WITHIN SAID OPENING, SAID BOLSTER HAVING A PAIR OF GUIDE MEANS FLANKING SAID PORTION OF THE WEDGE THEREBY ENABLING SAID WEDGE TO INERLOCK SAID FRAME AND BOLSTER AND LIMIT RELATIVE DISPLACEMENT OF THE BOLSTER TRANSVERSELY OF SAID FRAME; (C) SPRING MEANS URGING SAID WEDGE INTO ENGAGEMENT WITH SAID WEAR FACE AND THE REAR WALL; (D) DETENT MEANS ON EACH OF SAID COLUMNS PROJECTING INTO SAID OPENING TO LIMIT BOTH RETRACTION AND VERTICAL MOVEMENT OF SAID WEDGE RELATIVE TO SAID FACE A PREDETERMINED AMOUNT AND TO DEFINE THE UPPER LIMIT OF A RANGE OF MOVEMENT OF THE WEDGE AWAY FROM SAID WEAR FACE WITHIN SAID OPENING TO MAINTAIN SAID INTERLOCKING RELATIONSHIP BETWEEN SAID GUIDE MEANS AND WEDGE PORTION; AND (E) STOP MEANS WITHIN SAID POCKET ADAPTED TO ENGAGE THE WEDGE AT SAID UPPER LIMIT TO PREVENT THE TILTING OF THE WEDGE WITHIN THE POCKET.