Patent GB-190714183-A (GB)
Title: Improved Electrical Signalling System for Railways and Apparatus therefor.
Inventor: ENDERLEIN CARL
Filed: 1907-06-19
Granted: 1908-06-19
Abstract: 14,183. Enderlein, C., Landwebr, W., and Schulz, K. June 19. Automatic systems; semaphore &c. signals. - A signalling-system is described in which, besides the working circuit for setting signals, there are three other circuits, namely : (1) a circuit to return the arrangement to its original position after a train has passed, (2) a resting circuit, which releases the circuit closers in the signal-setting circuits, and (3) a circuit to break the first circuit so that a following train cannot return the arrangement until the first train is off the track. A train passing over contacts 1, 2, 3, 4, Fig. 11, closes the signal circuit 34 through electro-magnets e, thus releasing the ratchet-wheel c, Fig. 4, from the pawl d, and allowing a weight j to revolve a shaft a one step at a time. The shaft a is provided with a number of projections by which the necessary movement is given to the semaphore signals through levers pivoted on a shaft r which contact with the projections. For single-line working, at least four sets of projections are necessary, two for each direction of running, in order to protect the train both in front and behind. The form of the track contacts used is shown in Fig. 6. The train depresses the rails 37<v>, thus lifting a lever 13 against the action of a spring 15. The lever 13 in rising closes the circuit 34 at the contact 14, and is held up by an electro-magnet 12 which is in the resting circuit 32, until this circuit is broken at the points 7, 8, Fig. 11, by the passing of a train. The lever 13 is provided with an insulating - block 16 to prevent the closure of the circuit 34 on its return. The circuit 36, which is closed by contacts 9, 10, includes two tumbler switches, which are arranged to include the electro-magnets e in the circuit except in the position in which the operating shaft should be when no train is in the section, so that, when a train passes out of the section, it will return the shaft to this position by closing the contact 10. To prevent a second train from coming on the track, and influencing the magnet e, the circuit 36 is broken when the train closes contact 5, 6 by a magnet, which is energized by the closing of either of the circuits 33, 35. This magnet attracts a lever, and breaks the circuit 36, the lever being held in its attracted position by a magnet in the resting circuit. The circuit 36 is consequently broken until the train, on leaving the section, breaks the resting circuit 32 at the contacts 7, 8. For single-line working, an arrangement is described for bringing the set of projections corresponding to the direction of running under the levers connected to the signals. For this purpose, the electro-magnets h, i are inserted in the circuits 33, 35. When a train coming from station Y actuates the circuit-closer 6, the magnets h attract their common armature k, Fig. 4, thus allowing the weight o to turn the shaft n which carries an eccentric ; this, by means of a rod q, presses the shaft r of the levers into its correct position. The shaft r also carries a sheave z held in its outer position by the armature of the electromagnets i, so that a train coming from the station X and closing the circuit 33 releases the shaft r, which is then pushed back by the spring s. As an additional security, the circuits 33, 35 are each led through one of the plates y, t, and the shaft a is provided with a projection w which presses down the levers x, thus breaking the contact between the plates y, t, except when a train is passing. The working of the train is as follows. When a train leaves X, it closes the circuit 36 at contact 9, but as the shaft is in its starting position, the tumbler switches do not include the magnets e in the circuit. The train then breaks the resting circuit 32 at 7, thus bringing the circuit-closers, Fig. 6, into position ; it then closes the contact 5, and completes the circuit 33, and the levers actuated by the shaft are brought into position. The circuit 36 is also broken. The contacts 1, 2, 3, 4 are then successively made, the shaft a is turned, and the section semaphores, which are placed at the contacts 2, 3, are actuated. Before entering the station Y, the circuit 35 is closed at 6, and the levers are thus arranged for a train coming from station Y, the circuit 32 is broken at 8 thus returning the contacts, and at 10 the circuit 36 is completed, thus allowing the shaft b to be returned to its starting position. For double-track working, the device for moving the levers is omitted. Instead of the shaft a, a number of correspondingly - formed sheaves may be used; in addition to the two semaphores at the points 2, 3, additional signals may be arranged at the points 1, 4, and the signals may be connected to a miniature signal in the one (or for single tracks two) miniature signals at the station.