Patent GB-190416059-A (GB)
Title: Improvements in Apparatus for the Generation of Electricity Primarily Designed for the Electric Lighting of Trains.
Inventor: HUTCHINS THOMAS WILLIAM STAINE
Filed: 1904-07-20
Granted: 1905-07-20
Abstract: 16,059. Hutchins, T. W. S. July 20. Dynamos, driving; dynamos, regulating.-In using an ordinary dynamo for the electric light. ing of trains and other purposes, the armature revolves at constant speed owing to a system of gearing by expanding pulleys. As shown in Fig. 2, a shaft 1 carries a loose pulley 2 driven from the axle of the railway &c. carriage. The shaft 1, when caused to rotate by the magnetic clutch 3, communicates its motion to a sliding clutch 4 with teeth 5 to engage with teeth 6 on one of the bevelwheels 7, 8, and so drives a third bevel-wheel 9 in one direction only. The bevel-wheel 9 is mounted on a sleeve 10, Fig. 1, loose on the fixed shaft 11, which carries expanding pulleys 12, 13 and 14, 15. The part 12 is fixed on the sleeve 10, the part 15 is fixed on a sleeve 16, and the parts 13, 14 are loose on a nut 17 fitted on a screw-thread on the shaft 11. The position of the two parts 13, 14 is controlled by a governor which acts on the nut 17. The governor comprises the weight 19, carried by the spring 20, which may make contact with the rings 21, 22, and operate one of two sets of magnets 23, 24. The magnet energized attracts the part 13 or 14 of the pulleys, and the nut 17 rotates und travels along the shaft 11 to vary the diameters of the expanding pulleys. A belt or rope 25 is passed over the two expanding pulleys and two or more guide-pulleys. By this gearing the speed of the expanding pulley 14, 15 is made constant, and the armature 29 of the dynamo is driven from the sleeve 16. Fig. 4 shows the connections, and the arrangement for switching the accumulators on the lamps. The centrally-pivoted switch 33 makes contact with resistance coils 34, 36. A solenoid or wire 32 is fixed to the bar, and is heated by the passage of the current, its expansion and contraction adjusting the resistances in circuit. As shown, the cells are on the full voltage of the dynamo, but the full resistance 34 is between the dynamo and the lights. The dynamo may be driven by water or wind power &c. Armatures.-The Provisional Specification also describes a dynamo armature with two windings, one for the accumulators and one for the lights, the armature being connected to the second expanding pulley by a pawl and ratchet-wheel. The accumulator winding embraces more iron than the winding for the lights and has, in addition to the shunt field, a second field emanating from a small pole excited by a winding in series with the accumulators and armature. When the train is running and driving the armature, the lights are supplied by one winding and the accumulators charged through the other, the pressure being increased on the accumulator winding by the series coils adding to the shunt coils. When the driving power is below the low-speed limit, the current from the accumulators flows back through the accumulator windings and puts the series coils in opposition to the shunt coils, allowing the armature to run over the sleeve at its proper speed.