Patent GB-144243-A (GB)
Title: Improvements relating to apparatus for controlling the brakes and the car doors on railway vehicles and the like
IPC: B61H11/00
Filed: 1919-11-07
Abstract: 144,243. Thomas, T. H. June 4, 1919, [Convention date]. Doors; steps.-When the conductor's valve for controlling the doors of a car is in position for opening the doors, it effects also a straight air application of the brakes and prevents the release of the brakes by the motorman's valve. An automatic emergency application of the brakes may also be made by the conductor's valve, the pressure which holds the doors closed is then released so that they may be opened by hand. The motorman's valve 1 at each end of the car is connected to the pipe 14 leading directly to the main reservoir 15, to the emergency brake pipe 11 to which reservoir air is supplied through the valve and to the straight air brake pipe 23, and is adapted also to control engines 8, 9 for actuating the end doors. At the centre of the car and on each side is a conductor's valve 3 controlling a side door engine 4 or 5 and the brake cylinder 7. An emergency brake valve 6 has the chamber 13 thereof connected to the main' reservoir pipe 14 and the piston chamber 10 connected to the emergency brake pipe 11. In running conditions and with the handles of the conductor's valves in doorclosed or handle-off position the straight air pipe 23 is connected by the port 45 and cavity 24 of one valve 3 to pipe 25, and thence by the port 45 and cavity 24 of the other valve 3 to pipe 26, which is connected through the cavity 27 of the emergency valve 6, and pipe 28 to the brake cylinder 7. The motorman can thus make a straight air application of the brakes by supplying air to the pipe 23 through the valve 1. Normally the piston chamber 30 of the door-engines 4, 5 is connected to exhaust by the pipe 43, and ports 42, 46, cavity 38, ports 39, 40 of the valve 3 and the piston chamber 29 is connected to the pipe 11 by the pipe 35 and port 36, cavity 47, and port 48 of the valve 3. The door are therefore held closed. Assuming the valve 3 at the left of the Figure, to be moved to the door-open position, the piston chamber 30 of the door-engine 4 is connected to the main reservoir pipe 14 by the ports 42, 41 and chamber 20 of the valve 3, and the piston chamber 29 is connected to the exhaust port 40 by ports 36, 37. and cavity 38. The door is therefore opened. In this position of the valve 3 also, the ports 44, 45 register so that air is supplied to the brake cylinder by the pipe 14, chamber 20, pipe 26, and cavity 27 of the valve 6, and as the communication between the pipes 25, 26 is cut off, the motor-man cannot take the brakes off. The valve 3 mav also effect an emergency application of the brakes by connecting the pipe 11 to the exhaust port 40 by ports 48, 49 and cavity 38, thereby moving the piston 12 and slide 16 of the valve 6 to the left so that air flows to the brake cylinder 7 from the chamber 13 of the lever 6. In this position of the valve 3 both of the chambers 29. 30 of the door-engine 4 are connected to exhaust port 40 by the ports 36, 42, cavity 47, and port 50, so that though the door is not opened by the engine it may readily be opened by a passenger. The valve 6 may include a relay valve 17 held closed by pressure in the pipe 18. This pressure is released when the hand is removed from the usual pilot valve on the controller 2. According to the Specification as open to inspection under Sect. 91 (3) (a), the conductor's valve may control the steps as well as the doors. This subject-matter does not appear in the Specification as accepted.