GB820778A - Improvements relating to railway vehicle brake rigging - Google Patents

Abstract

820,778. Railway brake rigging. WESTING- HOUSE AIR BRAKE CO. Feb. 19,1958 [Feb. 25, 1957; Sept. 5, 1957], No. 5365/58. Class 103 (1). In railway brake rigging, the brake cylinder 10 is secured to the brake beam 3, as by means of bolts 14 and straps 24, as shown in Fig. 1, and the piston 13 has a hollow piston-rod 12 that extends through the cylinder base-plate and the beam and has its end secured to a footplate 16 secured on the bolster by a pin 19. Application of fluid pressure to the spaces between the end of the piston 13 and the cylinder causes the latter to move away from the bolster carrying with it the brake beam 3 and the brake heads 7 at each end, the ends of the beam 3 being guided in guide feet 4 of channel section. In such construction since, even if the shoes 8, which are of composition friction material, instead of the cast iron generally used, wear completely away, the piston 13 will not have been moved through its full travel to compress the spring 21. It is, therefore, not necessary, with such construction, to provide any form of automatic wear adjustment mechanism. The clearance of the foot-plate 16 in the bracket 20 secured to the bolster 15 allows for some freedom of motion for the brake beam to allow for uneven wear of the plates 5. The construction shown in Fig. 5, includes two brake cylinders 31 and 32 spaced apart on the brake beam 3, a strut 33 being interposed between the beam 3, and the strap 24, the strut having a slot 34 therein, in which is pivoted a lever 35 whereby the brakes may be applied by hand mechanism. In Fig. 7, there is shown a brake mechanism, wherein the braking cylinder 112 is secured to one brake beam 103, and the piston has a thrust-rod 121 extending therefrom and secured to the other brake beam 104, handoperated mechanism 136, 138, 139 and 141 being pivoted to the rod 121 by pin 140.