Bogie with elastomerically sprung bolster

Claim 2

A FRAME COMPRISING TWO SIDE MEMBERS, BEARING MOUNTINGS FOR AT LEAST FRONT AND BACK WHEEL AXLES PROVIDED ON THE SIDE MEMBERS, AXLES MOUNTED IN SAID BEARINGS, WHEELS ON SAID AXLES, AT LEAST ONE CROSS MEMBER EXTENDING BETWEEN THE SIDE MEMBERS WITH ENDS PROJECTING INTO THROUGHWAYS FORMED IN THE SIDE MEMBERS EACH SAID CROSS-MEMBER BEING TERMINALLY PROVIDED WITH FRUSTOCONICAL CAVITIES, A SWIVEL BEARING SUPPORTED AT LEAST PARTLY BY SAID CROSS MEMBER, AND A PLURALITY OF SPACED BELL SPRINGS ON EACH SIDE MEMBER MOUNTED IN SAID CAVITIES TO SUPPORT THE CROSS-MEMBER ENDS, A FRUSTO-CONICAL CENTER PIN WITHIN SAID CAVITY, EACH SAID BELL SPRING HAVING A UNITARY RESILIENT ELASTOMERIC FRUSTO-CONICAL MEMBER FORMED WITH COAXIAL INTERNAL AND EXTERNAL FRUSTO-CONICAL THRUST SURFACES, RESPECTIVELY ENGAGING THE WALL OF SAID CAVITY AND FRUSTO-CONICAL CENTER PIN, SAID BELL SPRINGS FORMING THE SOLE CONNECTION BETWEEN SAID SIDE MEMBERS AND SAID CROSS-MEMBER.

Claim 3

A BOGIE FRAME COMPRISING TWO SIDE MEMBERS, CORRESPONDING AXLE BEARINGS PROVIDED ON EACH OF SAID SIDE MEMBERS FORWARDLY AND REARWARDLY THEREOF, FRONT AND BACK AXLES MOUNTED IN SAID AXLE BEARINGS, WHEELS ON SAID AXLES, A BOGIE SWIVEL BEARING SUPPORT COMPRISING AT LEAST ONE CROSS MEMBER HAVING ITS ENDS INTERSECTING THE LINES OF THE SIDE MEMBERS AS SEEN IN PLAN, EACH SAID CROSSMEMBER BEING TERMINALLY PROVIDED WITHE FRUSTO-CONICAL CAVITIES, A PLURALITY OF BELL SPRINGS SPACED APART AS VIEWED IN PLAN ON EACH SIDE OF SAID SIDE MEMBERS A FRUSTO-CONICAL CENTER PIN MOUNTED ON EACH SAID SIDE MEMBER WITHIN SAID CAVITY, SAID BELL SPRINGS BEING INTERPOSED BETWEEN THE CROSS MEMBER ENDS AND THE SIDE MEMBERS AND FORMING THE SOLE CONNECTION THEREBETWEEN, EACH SAID BELL SPRING HAVING A UNITARY RESILIENT ELASTOMERIC FRUSTO-CONICAL MEMBER FORMED WITH COAXIAL INTERNAL AND EXTERNAL FRUSTOCONICAL THRUST SURFACES RESPECTIVELY ENGAGING THE WALL OF SAID CAVITY AND SAID CENTER PIN, AND A SWIVEL BEARING CARRIED CENTRALLY ON SAID SUPPORT.

Claim 4

A BOGIE FRAME COMPRISING TWO SIDE MEMBERS, CORRESPONDING AXLE BEARINGS PROVIDED ON EACH OF SAID SIDE MEMBERS FORWARDLY AND REARWARDLY THEREOF, FRONT AND BACK AXLES MOUNTED IN SAID AXLE BEARINGS, WHEELS ON SAID AXLES, A BOGIE SWIVEL BEARING SUPPORT COMPRISING AT LEAST ONE CROSS MEMBER HAVING ITS ENDS INTERSECTING THE LINES OF THE SIDE MEMBERS AS SEEN IN PLAN, EACH SAID CROSSMEMBER BEING TERMINALLY PROVIDED WITHE FRUSTO-CONICAL CAVITIES, A PLURALITY OF BELL SPRINGS SPACED APART AS VIEWED IN PLAN ON EACH SIDE OF SAID SIDE MEMBERS A FRUSTO-CONICAL CENTER PIN MOUNTED ON EACH SAID SIDE MEMBER WITHIN SAID CAVITY, SAID BELL SPRINGS BEING INTERPOSED BETWEEN THE CROSS MEMBER ENDS AND THE SIDE MEMBERS AND FORMING THE SOLE CONNECTION THEREBETWEEN, EACH SAID BELL SPRING HAVING A UNITARY RESILIENT ELASTOMERIC FRUSTO-CONICAL MEMBER FORMED WITH COAXIAL INTERNAL AND EXTERNAL FRUSTOCONICAL THRUST SURFACES RESPECTIVELY ENGAGING THE WALL OF SAID CAVITY AND SAID CENTER PIN, AND A SWIVEL BEARING CARRIED CENTRALLY ON SAID SUPPORT.