Articulated structure for railway cars

Claim 1

IN AN ARTICULATED STRUCTURE FOR INTERCONNECTING AND SUPPORTING ADJACENT ENDS OF TWO RAILWAY CAR BODIES HAVING UNDERFRAMES AND CENTER SILLS, A TRUCK BOLSTER HAVING A CENTER BEARING AND A PIVOT PIN SOCKET, A PRIMARY END CASTING SECURED TO THE CENTER SILL OF ONE CAR BODY AND HAVING AN ANNULAR BEARING BOSS ROTATABLY SUPPORTED UPON SAID CENTER BEARING, A SECONDARY END CASTING SECURED TO THE CENTER SILL OF THE OTHER OF SAID CAR BODIES AND HAVING A HEAD SUPPORTED FOR UNIVERSAL MOVEMENT ON THE PRIMARY END CASTING, SAID HEAD AND BEARING BOSS HAVING OPENINGS IN VERTICAL ALIGNMENT WITH SAID PIVOT PIN SOCKET, AND A PIVOT PIN EXTENDING DOWNWARDLY THROUGH SAID OPENINGS AND HAVING ITS LOWER END JOURNALED IN SAID SOCKET, SAID HEAD AND BEARING BOSS HAVING COMPLEMENTARY ABUTTING CONCAVO-CONVEX SURFACES, SAID PRIMARY END CASTING HAVING A TOP WALL SPACED ABOVE SAID BEARING BOSS AND HAVING AN APERTURE TO RECEIVE THE UPPER END OF SAID PIVOT PIN, AND MEANS ON SAID TOP WALL TO ENGAGE SAID PIVOT PIN AGAINST UPWARD MOVEMENT THROUGH SAID APERTURE.