Patent GB-1045919-A (GB)
Title: Retaining devices for use in the marshalling of rail-borne wagons
IPC: B61K7/00
Filed: 1963-10-11
Abstract: 1,045,919. Railway wheel stops. A. M. HOWARD. Dec. 21, 1964 [Oct. 11, 1963], No. 40222/63. Heading B7L. A retaining device for stopping a railway wagon running on a track 25, Fig. 1, comprises a fixed frame 21 in a pit 20 below the track; an arm 22, pivoted on the frame 21 and carrying a shoe 23 for engagement with the flange 241 of a wagon wheel; a guide frame 30 pivoted at 301 to the frame 21; a cross-head 29 slidable in the frame 30; toggle levers 28, 31 pivoted by pins 291 to the cross-head and at 27 and by a shaft 32 to the arm 22 and frame 30 respectively; a resilient shock absorber 39 fixed to the pit at 201 and having a domed head 394 engaging a domed head 304 on the frame 30; a screwed shaft 34 mounted in the frame 30 and passing slidably through a hole in the crosshead 29; a nut 29a on the screwed shaft 34 and slidable in the frame 30; and an electric motor 35 carried by the frame 30 and connected by a chain and sprocket to the shaft 34. The shoe 23 is raised from below the track to a wagon wheel obstructing position either manually by a lever 38 which may be keyed to the shaft 32 or by a marshalling bogie, movable between the tracks in the manner described in Specification 932,008, engaging a lever 37 keyed to the shaft 32 and provided with a counterweight 37a. The shoe is lowered by operating the motor 35 whereby the nut 29a will move the crosshead 29. Alternatively, a further lever 36 may be keyed to the shaft for operation by the marshalling bogie when moving in the direction A. The shock absorber 39 comprises a stack of rubber rings 391 alternating with metal discs 392, prestressed by nuts 401 or bolts 40 and supported on a fixed guide rod 393, as described with reference to Fig. 3 (not shown). Under severe impacts the complete device is depressed against the action of the shock absorber when the parts still in the position shown in Fig. 1 and finally rebounds into the obstructing position for the next approaching wagon wheel. In another form the cross-head 29 is tapped to engage the threads on the shaft 34 and in this case the shoe is both raised and lowered by the motor 35 which is controlled remotely, limit switches 351, 352 being provided on the pivoted frame 30. The screwed shaft 34 may be omitted and the shoe 23 then raised by the marshalling bogie and lowered manually. In another embodiment described with reference to Figs. 4, 11 and 12 (not shown), wherein the device is raised by the bogie and lowered manually, the device is generally similar to that shown in Fig. 1 except that the shock absorber is pivoted both to the pit base 201 and to the guide frame 30. Moreover, the cross-head is replaced by a roller movable in the guide frame 30 and which at the lower end of the frame engages a rubber-metal shock absorber. The manual lever in this instance is pivoted to a fixed guide track below the rail track 25 and has a short arm to engage the roller. The lever 37 in this instance is engaged in a shoe member slidable on the track 44 and operable by the marshalling bogie as described with reference to Figs. 11 and 12 (not shown).