Patent GB-190409273-A (GB)
Title: Improvements relating to Brake Mechanism for Trains and Vehicles.
Inventor: GRESHAM JAMES
Filed: 1904-04-22
Granted: 1905-04-20
Abstract: 9273. Gresham, J., Gresham, H. E., and Kiernan, G. April 22. Brakes, combined steam and vacuum. Relates to a valve apparatus for connecting the vacuumbrake system of a train to the steam brakes on the engine and tender, so that the vacuum and steam brakes are operated simultaneously, and to modifications of the valves and combining-tubes of the ejector. The apparatus may be fitted to the ejector described in Specification No. 20,304, A.D. 1903, or, in a modified form, to the boiler or a steam pipe. In the arrangement shown in Figs. 1, 8, and 9, the conical valve a, controlling the passage of steam to the steam brake, is screwed to a ring g on webs h extending upwards from the spindle i, and is guided by a plunger y supported by its lugs z entered loosely between the shoulder 2 in the casing and the end of the liner 3. When air is admitted to the train-pipe, it passes also through the port t to the cylinder r, and the piston u falls, so that the hand-lever m opens the valve a, and the steam, entering the passage d, as described below, passes into the chamber f, which is connected directly to the steam brake, and is cut off from the exhaust passage x by the valve 5 formed on the spindle i. The valves a, 5 are provided with cylindrical parts 42, 43, which, fitting easily the corresponding passages, enable both the steam and exhaust passages to be closed. The latch 36, which may be engaged with the pin 37 so as to prevent the steam brake from operating when the air is in the train-pipe, is removed automatically by the rise of the piston w. The valve casting contains the steam valve 7, Fig. 9, described in the prior Specification, which admits air to the chamber d, the casings of the valves a, 7 being connected by a passage 32. The casting is secured by its flange 8 to the flange 9 of the ejector 10, and the passage t, 12 between the train-pipe connection and the cylinder r is fitted with a ball valve 11. In removing the brakes, the valve 11 allows the air to be withdrawn rapidly from above the piston u, and, in applying the brakes, the valve closes, and the air passes slowly through the bye-pass 14<1> and causes the steam brake to be applied in about the same time as the vacuum brakes. The valve 16, Fig. 8, admits steam from the chamber 41 to the chamber 14 connected with the chamber above the valve 7, and the steam passes through the valve 7 to the chamber 15 and the ejector. When the valve 16 is open, its upper conical surface seats upon the seating 20 and prevents leakage. To reduce the necessity for accurate adjustment of the combining cones, a small tube 28 with a perforation 30 is fitted so as to lead from the steam space 29 into the air cone 24. In another arrangement of the valve a, its spindle i is placed horizontally, as shown in Fig. 13, and the valve casing is modified to allow the steam valve 7 to be placed in the ejector casing, and to admit of the passages t, 4, 32, being reduced to circular ports in the oval flanges 8. The main stop valve, shown at 16, Fig. 8, is omitted. Fig. 15 shows another modification which may be attached by the flange 33 to the boiler or to a steam connection leading from it. The cylinder r is connected by a pipe 34 to the train-pipe, and the exhaust chamber x is fitted with an exhaust pipe.