Patent GB-1133370-A (GB)
Title: Railway car truck brake apparatus
IPC: B61H1/00
Filed: 1966-12-13
Abstract: 1,133,370. Brakes, arrangement and disposition of. WESTINGHOUSE AIR BRAKE CO. 13 Dec., 1966 [27 Dec., 1965], No. 55703/66. Heading B7L. [Also in Division F2] Fluid-pressure brake apparatus on a rail vehicle comprises a hollow cylindrical portion formed at one or both ends of a side frame of the vehicle and either directly providing, or providing a housing to receive, a brake cylinder for applying brake blocks to the vehicle wheels. In the embodiment shown, a brake cylinder 12 has an integral pressure head and flange 13 by which it is bolted to the end of a hollow cylindrical portion formed at one end of a side frame 1 of the vehicle, the side frame being one of a pair which interconnect the axle boxes 7 at opposite ends of the vehicle and which also provide support portions 2 for nests of springs 3 on which bolsters 4 supporting the vehicle body (not shown) rest. There is thus one cylinder 12 at each corner of the vehicle for applying a brake shoe 88 to the respective wheel 10. Each cylinder contains a piston 22 carrying a packing cup 21 and a resilient ring 23 to prevent hammer. A rod 34 having an integral guide member 33 which carries an 0-ring 35, is received within a cylindrical extension 25 of the piston and is connected by a clevis 43 to the upper end of a lever formed of two parts 44, 45, which are received together by bolt 57 and pin 56 and connected by splines (61, Fig. 7, not shown) to a splined crankshaft 64 having a depending arm which carries the brake shoe. This arrangement facilitates shoe replacement since it is only necessary to remove pin 55 to enable the crank to be rotated sufficiently for this purpose, the parts 44, 45 then pivoting relatively to each other about the bolt 57. The shoe 88 is secured conventionally by a key 89 to a block 76 which is pivotally mounted on a shaft (73, Fig. 6, not shown), integral with the crank arm and is adjustably secured in relation to the shaft (73) by the provision of two interengaging toothed members 77, 80, the former of which is associated with the block 76 and the latter, by means of a pin 83, to a reduceddiameter end portion 74 of the shaft (73). By removing the pin 83, the members 77, 80 can be disengaged and relatively rotated so that the shoe conforms to the wheel periphery. The association of member 77 to the block 76 is by way of a stop lug 84 on the member 77, which engages the upper portion of the block, and a compression spring 86 between abutments 85, 87 on the member and block respectively, whereby limited rotation of the block in one direction is possible to prevent binding of the shoe when foreign matter enters between the shoe and wheel. Handbrake linkage is provided at one side of the vehicle and comprises a modified crank 71, Fig. 12, associated with the brake on one wheel, crank 71 having an arm 72 which is connected by a link 91 to a floating lever 95 one end of which is connected to a clevis 103 which surrounds the clevis 43 and is connected to the lever 44, 45 by a common pin 107, and the other end of which is connected by link 110 to a hand wheel-operated applying mechanism. In modifications (Figs. 13 and 14, not shown), the cylinder at each end of each frame side member may be either formed directly as a bore (112) in the hollow cylindrical portion, or may be a pressed steel cylindrical member (120) formed separately from a pressure head (122) and provided with a flange (124) by which it is secured, together with the pressure head, to the end of the hollow cylindrical portion, a plastic locating ring (126) being fitted at the inner end of the hollow cylindrical portion to locate the inner end of the cylinder.