Patent GB-1019086-A (GB)
Title: Improvements in or relating to railway vehicles
Inventor: PETERSON WILLIAM HARTIN
IPC: B61D45/00
Filed: 1962-08-27
Abstract: 1,019,086. Railway vehicle undercarriages. PULLMAN Inc. Aug. 27, 1962, No. 32775/62. Heading B7L. A railway vehicle 10, Fig. la, comprises an underframe 12 in the form of a centre sill supported at its ends on bogies 13, a load carrier 14 mounted for longitudinal sliding movement on the underframe and an hydraulic cushioning device 18 connected between the underframe and carrier to cushion impact shocks, the resistance of the device 18 being varied by selfadjusting means 92-114, Fig. 2, in accordance with the weight of the load carried. Referring to Fig. 6, the cushioning device comprises an hydraulic cylinder 48 having a closure member 54 and a tubular piston rod 52 for a piston head 50 slidable in the cylinder, the outer end of the rod 52 having a closure 56. Tandem springs 62 are disposed between the closures 54, 56 which engage stop plates 46, Fig. 2, on the centre sill and lugs 44 on the carrier 14. The piston head 50 has an orifice 66 slidable over a tubular meter rod 64 secured to the closure 54. The piston rod 52 is slidable in a cylinder head 196 secured in the cylinder 48 and provided with orifices 208. The head 196 is connected to the piston rod by an invaginating boot 190, and has sets of apertures 204 and 214. Hydraulic liquid fills the cylinder 48 between the piston 50 and closure 54; the interior of the meter rod and the interior of the piston rod 52; the space between the piston 50 and the head 196; and the space between the rod 52 and the flexible boot 190. The meter rod 64 comprises a fixed tube 82 and an inner rotatable tube 80, the former being provided with longitudinally spaced apertures or ports 86 whilst the latter is provided with longitudinally spaced ports 84 alignable with the ports 86. The resistance of the device is altered by rotating the tube 80 to alter the effective size of the ports 86. The tube 80 is connected to a rod 92 slidable and rotatable in the associated stop plate 46 and having mounted thereon a gear-wheel 96 rotatable in a bracket 94 on the underframe. The wheel 96 meshes with a rack 98 on a piston rod 100 having a piston 104 slidable in an hydraulic cylinder 102 secured to the underframe. The cylinder 102 has a manifold 108 connected by tubing 110, 114 to four sensing devices 112 connected between the ends of the bolsters 127 of the two bogies and the bogie side frames. Each sensing device comprises an hydraulic cylinder 124, Fig. 5, connected to a tube 114 and having a piston 126 therein whose piston rod 122 is secured to a washer 120 movable in a sleeve 116 against the urge of opposed springs 118. The sleeve is connected to the bolster and the cylinder to the bogie side frame. Clearly as each bolster moves vertically relative to its side frame according to variations of the load carried by the underframe carrier, the movement of the pistons 126 will cause the piston 104 to move and cause rotation of the gearwheel 96 and the rod 92 and thus alter the resistance of the cushioning device 18. The springs 118 are provided so that sudden deflections of the bogie springs due to track variations do not operate the rod 92. Means are provided to prevent rotation of the device 18, as a whole, relative to the carrier 14. Rotation of the meter tube 80 relative to the tube 82 is limited by a pin 294 on the tube 80 engaging a slot 295 in the tube 82. In a modification of the tube 80, the ports 84 are elongated and each have a teardrop configuration transversely of the tube. According to another embodiment, Fig. 15, the load carrier slidable on the underframe is provided with two side-by-side cushioning devices 621 and the control rods 651 thereof are operable by a cross arm 710. Feeler plates 660 and 66] engaging the front and rear bogie side frames on opposite sides of the vehicle are secured to rods 657 and 658 rotatably mounted in the underframe to cause relative transverse sliding movements of drive-bars 664 and 665. The bar 664 has rotatably mounted therein a gearwheel 698 which engages a rack portion of the bar 665. The shaft 697 of the gear-wheel 698 is connected by a flexible connector 701 to a link 706 rotatably mounted in the underframe at 705, the link having a slot and pin connection 707, 708 with a bracket 709 on the cross-arm 710. Clearly movements of the load carrier relative to the bogies are summed by the bars 664, 665 and the wheel 698. Deflections of the bogie springs due to track variations are prevented from operating the control rods, by the provision of a shock-absorbing device 672 in the bar 665. An hydraulic damper 678 is also connected between the bars 664 and 665.