GB190522928A - Improvements in Automatic Air Brakes for Railway and other Vehicles - Google Patents

Abstract

22,928. Turner, W. V., and Farmer, C. C. Nov. 19, 1904, [date applied for under Patents Act, 1901]. Brakes.-In addition to the ordinary train - pipe 62 on electrically - propelled or other cars, a control pipe line 70 is employed. It is kept constantly supplied with air at the maximum train-pipe pressure from the main reservoir or reservoirs 66 through a reducing valve or valves 71, and it is in communication with the train-pipe 62 through the driver's valve or valves 69 and with all the triple valves 64 of the train through branch connexions 81 in such a manner that, when the triple valves are moved by reduction of pressure in the train-pipe to cause a service application of the brakes, the connexions 81 are shut off and air passes as usual from the auxiliary reservoirs 63 to the brake cylinders 65, but, when the triple valves return to release the brakes, the connexions 81 are opened and allow air from the control pipe 70 to pass to the auxiliary reservoirs, which are thus quickly re-charged. Where there are several motor cars in a train, each equipped with a main reservoir 66, compressor 67, and governor 68, the pipe 70 serves to connect up all the main reservoirs, which are thus all utilized in the operation of the system, all the driver's valves except that on the car from which the brakes are to be operated being turned to lap position. Fig. 2 shows a section of the ordinary triple valve as modified for connexion with the pipe 81 from the control pipe 70. In the release position shown, air from the pipe 81 enters by the additional port 90 in the slide-valve seat and passes to the auxiliary reservoir on the left of the valve casing through a port 89 in the slide valve. On a service application of the brakes, the slide valve moves to the right and closes the port 90, thus shutting off the pipe 81, while air from the auxiliary reservoir passes to the brake cylinder in the usual manner. The pressure in the cylinder may then be graded down by turning the driver's valve momentarily to 'release' and then back to ' lap.' The consequent wave of pressure in the train-pipe moves the triple valve to the release position, and air from the brake cylinder discharges to the atmosphere throuch ports 87, 86, 88, 92 and exhaust port 91 until the air entering from the control pipe through the port 90 moves the graduating slide valve 84 back sufficiently to close the communication between the ports 86, 92, thus stopping the exhaust from the cylinder, and to close also the port 89 and thus prevent further movement of the triple-valve piston.