Patent GB-1282202-A (GB)
Title: Sealed non-spin hand brake operating arrangement
IPC: B61H13/04
Filed: 1970-03-13
Abstract: 1282202 Railway brake-operating mechanism CARDWELL WESTINGHOUSE Co 13 March 1970 [27 Oct 1969] 12221/70 Heading F2E An American-type hand-wheel-operated brake mechanism for railroad cars including a geardriven winding-drum on which a brake-applying chain may be wound has the gear elements totally enclosed, and the casing of the mechanism is indented, the drum being mounted on a shaft journalled between the indentation and a removable cover plate. These and other characteristic features are described in greater detail below. As shown, the mechanism closely resembles that shown and described in Specification 1,176,761, and the operation of it is identical, but the differences which are features of the present invention are as follows. The housing 11 comprising front casing 14 and back attaching plate 16, Fig. 1, secured together by bolts Fig. 2, journalling the operating shaft 66 and housing the pinion 62, the ratchet means 96, the jaw clutch 118, the brake holding means 150 and the drum gear 34, does not house the winding drum 30. Instead, the front casing 14 is indented at 200, Fig. 1, to define an operating space 202 for the drum, and a drum cover plate 236 is removably secured to the front casing over the space 202. A drum shaft 230 is journalled between the front casing 14 and the drum cover plate 236 but includes an end portion 248 extending into the space between the front casing 14 and the attaching plate 16, stopping short of the attaching plate 16. The drum gear 34 is welded to the end portion 248, while the portion 232 of the drum shaft within the drum operating space 202 has a polygonal cross-section corresponding to the bore of the drum hub 220. The drum hub 220 is fixed against longitudinal movement by a shear pin 262, and means are provided for centering the drum and shaft within the drum operating space so as to maintain the drum gear 34 spaced from the attaching plate 16. Also a seal element 214 is compressed between the front casing 14 and the attaching plate 16, Fig. 1, to seal the space 204 enclosed thereby. Preferably the journalling for the drum shaft 230 includes annular bearings 244, 256, and the means for centering the drum comprises end portions 264, 266 of the hub 220 disposed adjacent the respective bearings. Preferably the seal element 214 is received in an indent 210 formed all the way around a flange 206 extending from the rim of the front easing 14, and the bolts 26 securing parts 14, 16, serve also to clamp the seal element into engagement with both. The operating mechanism may be mounted vertically, or may be turned on its side and secured to the underframe of the railroad car to extend longitudinally between a pair of mounting plates secured to the car sides. In the latter case the hand wheel 68 and release handle 136 are removed, and extension shafts 17, 19, Fig. 4, each having a hand wheel (not shown) at the end, and extension shafts 25, 27, each having a release handle at the end (not shown), are provided. Fig. 4 also shows an extension outwards of the operating space 202B to accommodate a longer drum hub 326 provided with a chain anchor and guide 362 of the type described in Specification 2,723,832 for double chain wind for increased brake-chain take-up