Railway car center plate

Claim 1

IN A RAILWAY CAR, A TRUCK CENTER PLATE HAVING AN UPSTANDING ANNULAR SHOULDER SURROUNDING AN UPWARDLY PRESENTED HORIZONTAL LOAD CARRYING SURFACE, A CAR CENTER PLATE HAVING A DEPENDING ANNULAR SHOULDER SURROUNDING A DOWNWARDLY PRESENTED HORIZONTAL LOAD CARRYING SURFACE, SAID SHOULDERS BEING IN TELESCOPING RELATION, AN ANNULAR SANDWICH FORMING THE LOAD CARRYING CONNECTION BETWEEN THE CAR AND TRUCK CENTER PLATES, SAID SANDWICH HAVING AN ANNULAR TOP PLATE, MEANS FOR NON ROTATABLY ANCHORING THE TOP PLATE TO SAID DOWNWARDLY PRESENTED SURFACE, AN ANNULAR BOTTOM PLATE, MEANS FOR NON ROTATABLY ANCHORING THE BOTTOM PLATE TO SAID UPWARDLY PRESENTED SURFACE, AN ANNULAR BODY OF ELASTOMER SANDWICH BETWEEN AND BONDED TO THE TOP AND BOTTOM PLATES, THE TOP AND BOTTOM PLATES AND THE ELASTOMER BEING DESIGNED SO THE CAR WEIGHT APPLIED TO THE ELASTOMER LOADS THE ELASTOMER SUBSTANTIALLY SOLELY IN COMPRESSION AND RELATIVE ANGULAR MOVEMENT OF THE TOP AND BOTTOM PLATES LOADS THE ELASTOMER IN TORSIONAL SHEAR, AND MEANS FOR PREVENTING BULGING OF THE ELASTOMER UNDER VERTICAL LOAD AND THEREBY INCREASING THE STIFFNESS IN A VERTICAL DIRECTION AND MINIMIZING VERTICAL DEFLECTION WITHOUT AFFECTING THE SHEAR STIFFNESS OF THE ELASTOMER NECESSARY TO ACCOMMODATE RELATIVE ANGULAR MOVEMENT BETWEEN THE CENTER PLATES AND RAISING THE NATURAL FREQUENCY OF THE CAR IN THE VERTICAL DIRECTION ABOVE THE RANGE OF THE TRACK EXCITED FREQUENCIES OF TWO TO SEVEN CYCLES PER SECOND.