Patent GB-121603-A (GB)
Title: Improved Method of and Apparatus for Controlling Railway Points and Signals.
Inventor: MONARD ALFRED
IPC: B61L19/14
Filed: 1918-12-07
Abstract: 121,603. Monard, A. Dec. 19, 1917, [Convention date]. Interlocking and controlling and locking; handlevers and hand gearing; hand-levers and hand gearing, interlocking.-Points and signals for any given route are operated electrically and controlled by one hand-lever, forming part of a combiner, relays and control circuits being so arranged that the signals can be operated only after all the points have been fully operated. Each route lever is connected to a spindle carrying cams which co-act with points' planes, each corresponding to a set of points; the use of such cams and planes for locking and interlocking is described in Specification 9382/08 in connection with mechanical control. An electric look controlled by a track circuit is fitted to the points' planes in order to prevent operation of the points while a train occupies the track approaching the points. A lever for operating each points' plane individually is fitted. Fig. 10 shows the combiner, Fig. 13 shows the track-controlled locking device for a points' plane, Fig. 1 shows the general arrangement of the circuits for operation and control of the points 12 and signal A<1> by means of a hand-lever A (Fig. 1), 34 Fig. 10. The lever 34 is movable in a notched quadrant 35, and is connected by a pinion to a rack 36 which, in turn, rotates the spindle 30 carrying cams, so placed thereon as to engage the points' planes 31 which refer to those points concerned in the route controlled by the lever 34 and to operate or lock these planes as may be necessary. The planes carry cams or ramps by means of which contacts 1, 5 in the circuits of the motors for operating the points to normal or reverse position are closed according to the position of the planes. The spindles 30 are also geared to spindles 40 carrying contact-making members forming, with fixed springs, the commutator C in the signal controlling circuits. In connexion with each set of points, two controlling magnets 4, 8 are provided in the cabin to control armatures E in the signal controlling circuits. These coils are so connected to contacts 3, 7, closed by the points that, when the points are fully home in either position, the corresponding magnet is energized, and the other magnet is earthed at both poles, while when the points are at any intermediate position, both magnets are earthed and de-energized. Contacts 2, 6 at the points are arranged in the motor circuit so as to put in circuit after operation of the points, the field magnet required for the next reversal, and also to close the control circuit just mentioned. A similar set of contacts 15, 16, 22 are provided on the signal, but only one indication magnet 17, for the danger position, is provided. The signal apparatus includes a control or clutch magnet 20 which is energized in series with the contacts E and contacts 25, 21 of the commutator C when the hand-lever is pulled over and the points are fully operated. In the case of a route including several sets of points, the contacts E are all arranged in series with the signalcontrol magnet 20. In order to lock the lever when a train is approaching the points, an electromagnetic look D, shown in detail in Fig. 13, is provided, and its circuit is controlled by a relay 144 connected in series with a battery 143 by way of a rail section 142 so as to be shunted by a train on this portion of track and de-energize the magnet 132, the armature of which carries a lever 133 having a projection 137 which engages the lever 134 in its movement in conjunction with the points plane 135. The plane can, therefore, only be moved to reverse the points if the magnet 132 is energized. The circuit of this magnet includes, in addition to the contacts of relay 144, the contact plate 136 which is engaged by the lever 134 except when the plane is in its extreme end positions.