Patent GB-189803163-A (GB)
Title: Improvements in and connected with Stopping-place and like Signals and Indicators for use on Railway Engines.
Inventor: BROMHEAD SAMUEL SIDNEY
Filed: 1898-02-08
Granted: 1898-05-07
Abstract: 3163. Bromhead, S. S., [Wallace, H. de]. Feb. 8. Indicators, station and lilce.-Relates to apparatus for reminding the engine-driver of the orders which he has received and is required to execute during his journey, by indicating the places, such as stations &c., at which such orders are to be executed. At each such place, an alarm bell on the engine is automatically started to ring, and continues to ring until stopped by the driver. In case the driver fails to attend to the indication within a suitable interval of time, the mechanism then acts to automatically apply the air brakes and stop the train. The mechanism shown is operated by the shaft 5, which is rotated continuously, while the train is travelling, by belt gearing &c., from one of the locomotive wheels. The shaft 5 is geared through the friction pulley 64 and disc 63 to the worm shaft 71, from which the motion is transmitted through the worm-wheel 76, shaft 77, and worm 78 to the worm-wheel 13, which carries the indicator hand 14. A reserve supply of rubber collars 65 for the friction-wheel 64 is mounted on the shaft 5, and the disc 63 is held against the wheel 64 by the adjustable spring 73. To permit of adjustment of the apparatus to locomotive wheels of different sizes, the position .of the wheel 64 on the shaft 5 is adjusted by means of the screw rod 69. When desired, the wheel 64 can also be adjusted to produce a forward rotation of the shaft 5 while the engine is shunting. The shaft 77 is mounted so that the worm 78 can be disengaged from the wheel 13 during adjustment of the wheel 64. The hand 14 is provided with a pointer 18, which indicates on the dials 17, 20 the position of the train at any time during the journey. These dials are marked with mile graduations, and with reference letters which, in conjunction with a reference card on the side of the indicator, indicate the various stopping- stations &c. The bell 23 is mounted on the revoluble shaft 2, which is driven from the shaft 5, and the bell hammers 24 are normally held inoperative by the trigger 35, which prevents the clutch 30 from engaging with the operating-wheel 29 of the hammers. The dial plate 20 is provided with a series of triggers 51, one for each station &c., which are normally held retracted by the projections 46 on the trigger bolts 42 engaging in corresponding notches in the edge of the plate 20. When the train reaches a station &c., the cam 47 on the pointer 18 releases the corresponding trigger 51, which then forces up the boss 38 and releases the trigger 35, so permitting the bell to start ring- ing. The trigger mechanisms are reset by the driver retracting the knobs 45, 33. The air-brake valve, Fig. 4, is connected to the spring-controlled bell-crank lever, and is normally held closed by a pawl on this lever engaging a worm on the shaft 55, Fig. 2. Should the driver fail to reset the bell mechanism, this shaft is rotated by the wheel 29 until it releases the pawl, on which the lever opens the brake valve and so applies the brakes.