Patent GB-190407614-A (GB)
Title: Improvements in or relating to Apparatus for Generating and Applying Electricity on Railway and other Vehicles.
Inventor: BEAUMONT FREDERICK JOHN
Filed: 1904-03-30
Granted: 1905-03-30
Abstract: 7614. Beaumont, F. J., and Still, W. M. March 30. Heating. - Relates to means for driving dynamos on railway and other vehicles from the axles and for connecting dynamos and secondary batteries to lighting or other circuits on such vehicles, and comprises improvements in the working of the switches and means for securing a constant pressure on the lighting-circuit in apparatus of the kind described in Specifications Nos. 6004 and 24,633, A.D. 1901, [Abridgment Class Dynamo-electric generators &c.]. The equipmeut consists of a compound-wound dynamo 18, Fig. 12, with two sets of windings, one having a commutator 23<a>, constituting a booster, a secondary battery 24, and two o automatically-operated switches, on e a being used for connecting the dynamo, or, as in the Figure, the secondary battery, with the lighting- circuit according as the armature attains or is below the normal working speed; the other 44 is a pole-changing switch which, for the purpose of avoiding the necessity of adjusting the dynamo brushes, is operated when the direction of motion of the vehicle is reversed. The dynamo is driven as shown in Fig. 2 by a belt passing over an axle of the vehicle and the pulley 61: This pulley has annular projections 61<b> adapted to engage grooves in the discs 60 keyed to the armature shaft, of which the outer one is capable of longitudinal motion along a feather and is normally kept in contact with the pulley 61 by a spring 70. When the speed of the pulley becomes excessive, the outer disc is drawn away by a governor, the arms of which bear against an abutment 69, and a certain amount of slipping takes place. Another frictional driving-device is also described of the multiple type. Fig. 4 shows the general arrangement of the circuit-controlling and pole-changing switches on the armature shaft l. In an opening in the lever a of the circuit controlling switch, which is pivoted at b, is a cam i, Fig. 9, on a sleeve j. This sleeve, which is capable of endways motion along the shaft, has lugs q, which can be engaged with lugs r on a collar s, fixed to the armature shaft, by the action of a spring t, and also a double cam or snail device u. The arms of a governor 3 bear against a plunger 8 in a contrary direction to the pressure of a spring 11. The end of this plunger has a grooved collar 10, in which rides a pin operating a framework 1, Fig. 7, by means of a system of levers. Pins 2 on the framework engage the snail device u on the sleeve j. The arrangement is such that the frame 1 will be moved in one direction by the action of the governor, when the speed rises to the normal working speed, and will cause the pin 2 to release the sleeve j. By the action of the spring 11, the lugs q will engage the rotating lugs r and cause the lever a to be moved by the cam i to make the desired contact. When this is effected, the other pin 2 will have engaged the other side of the inclined portion of the snail device u and withdrawn the sleeve from the action of the lugs r. The movable core 42 of a solenoid 43 in the lighting-circuit is attached to the frame 1 and controls the action of the spring 11 according to the load on the lighting-circuit. The movable lever 44. Fig. 6, of the pole-changing or reversing switch has a projecting lug 45, and rides on a stationary bearing having a cam lug 51. The actuating-lever 47, Fig. 19, rotates with and is pivoted at k to the armature shaft. When starting, a spring 53 causes the lug 49 on the lever 47 to engage the lug 45 and moves the switch over, if it be not already there, into the position making the desired connections. Further contact of these logs is then prevented by the action of the lugs 50, 51 and by the lever 47 assuming a radial position against the thrust of the spring 53 when the speed rises. It is assisted in maintaining this position by a spring catch 54. Another form of pole-changing switch and lubricating-means are also described.