GB1195472A - Draft and Buff Gear for a Railway Vehicle - Google Patents

Abstract

1,195,472. Draft and buff gear for railway vehicles. MIDLAND-ROSS CORP. 18 Jan., 1968, No. 2735/68. Heading B7T. A draft and buff gear for railway vehicles comprises a housing 5 secured centrally and longitudinally to the underframe of a railway vehicle and containing an hydraulic, friction or resilient cushioning unit 7 pivoted at its ends to the housing 5 and a coupler 6 by means of partspherical concave and convex surfaces on the unit 7 and having a common centre of curvature located on the draft gear axis, these surfaces engaging complementary surfaces associated with the housing 5 and the coupler 6. In an embodiment, the unit 7 has a concave surface 41 engaging the convex surface of a bowl member 45, and a stud 40 on to which is screwed a nut 42 having a convex surface 43 engaging the concave surface of the bowl member 45, the member 45 being secured to the housing by direct welding thereto or by the sliding of its flanges 46, 47 into recesses in stops 12, 14, plates 51 and 52 being riveted to the housing 5 to retain the gear. The unit 7 has a piston-rod 16 on to which is screwed a nut 17, the convex surface 18 thereof seating on a concave surface 19 of a casing 21 connected by a pin 34 with the coupler 6, and the concave surface 23 thereof engaging the convex surface 24 of a follower 25 in the casing 21. In buff, a block 26 transmits the force through resilient pads 27, 28 and the follower 25 to the piston-rod 16, and in draft the casing 21 is pulled forwards by the pin 34 and acts at 19, 18 on the nut 17 and piston-rod 16. Spring unit 55 establishes the neutral condition of the gear. In other embodiments, the unit 7 is turned end-for-end, and the unit 7 and the members in the casing 21 are contained in a single casing. In a further embodiment, a single block directly engages the piston-rod end and the coupler butt.