Patent GB-809041-A (GB)
Title: Railway route setting equipment
IPC: B61L19/06
Filed: 1956-07-27
Abstract: 809,041. Railway route-setting equipment. STANDARD TELEPHONES & CABLES Ltd. July 27, 1956 [July 28, 1955], No. 23306/56. Class 105. In a railway route-setting equipment of the type in which a route is established by the manual operation of route-entrance and routeexit switches located on a track diagram control board and in which the locked points in an established route are successively released with the passage of a train over the route, a route is cancelled by the operation of a routecancelling key and of the route exit button of the established route. The same circuit is used to effect the locking and release of the points of an established route employing A.C. for one and D.C. for the other. Two releasing circuits are used, one being completed and the other interrupted in order to start the route-releasing operation. In the track layout shown in Fig. 1A the positions of the points is indicated by a thickened line, points 1 and 3 being normal and points 2 reversed, so to set up a route from signal 4 to signal 5 requiring all points normal it is necessary to move the points 2 to normal. The route is set up by operating the route entrance button 4T on the mimic diagram control board, Fig. 1B and the route exit button 5Z, these buttons initiating a chain of points selecting relay circuits, for facing points in the direction of travel, viz. points 1 and 3 and for trailing points in the direction of travel, viz points 2, resulting in the operation of two check relays 4Q and 5Q, Figs. 3 and 2, not shown, for the respective chain circuits providing none of the points are engaged for another route and a points setting relay 2X (not shown) is operated to cause the points 2 to move to the normal position. Manual points release relays 1K, 2K, 3K of one release circuit, Fig. 4, have operated, over back contact (b.c.) 5A2 of the exit button repeat relay 5A, front contact ( f.c.) 5E3 of the exit button relay 5E, Fig. 7, b.c. 3R6 of the points position, relay 3R, not shown, of points 3, b.c. 3R2, fc. 3P5 of normal points setting relay 3P, not shown, of points 3, and b.c. 3V2 of the points lock relay 3V, Fig. 5, of points 3. Similarly relays 1K and 2K of points 1 and 2 are operated. The windings I of all points lock relays such as 2V, Fig. 5, of points 2 are energized with A.C. current over f.c. 5Q3, Fig. 5, of the route check relay 5Q, Fig. 2, not shown; b.c. 5Z2 of the now released exit key 5Z; f.c. 5E5; b.c. 3R3 of the points position relay of points 3, f.c. 3K2 of the manual points release relay 3K for points 3, b.c. 3V3 of the points lock relay 3V of points 3, and over similar circuits for relays V and V2. The stick and latch relays V1, V2, V3 are reversed and the circuits of their windings I, Fig. 5, interrupted at f.c. 1V3, 2V3, 3V3, Fig. 5, respectively. At contacts IV2, 2V2, 3V2, Fig. 4, the energizing circuits of release relays 1K, 2K, 3K are opened but these relays are held over their front contacts 1K1, 2K1, 3K1, respectively. The release relays 1H, 2H, 3H of the second release circuit, Fig. 5, do not respond to A.C. The signal control relay 43, Fig. 6, is operated in a proving circuit over f.c. 5Q4, f.c. 5E6 ... b.c. 4E6 and at f.c. 4S1, Fig. 7, lights the proceed lamp 41 over f.c. 4Q6. As a train passes over the route and leaves the sections, relays IV, 2V, 3V and 1K, 2K, 3K are restored to their normal condition, e.g. through the energization of the windings II of points locking relay such as 2V by the track relays. To release manually the points locking, the exit button 5Z, Fig. 1B is operated simultaneously with a cancelling key F, Fig. 1B. At f.c. F5, Fig. 4, the exit button repeat relay 5A is operated over f.c. 5Z4 and is held over f.c. 5A4 and 5E4. Contact F4, Fig. 4, has no effect at this stage since contact 4Z4 is open. The operation of relay 5A causes the normal points setting relays 1P, 2P, 3P, not shown, to drop away as well as the check relay 4Q, not shown, causing the energizing circuit of winding II, not shown, of key repeat relay 4N to be interrupted and this relay drops away as well as check relay 5Q, not shown. At b.c. 5A2, Fig. 4, on opening, the relays 3K, 2K, 1K are released and at f.c. 5A3, Fig. 5, D.C. voltage is applied over f.c. 5Z2, 5E5 to operate the second release circuit relays 1H, 2H, 3H over b.c. 1R3, f.c. 2R3 and b.c. 3R3. At f.c. 2H1, Fig. 7, the winding II of points lock relay 2V is energized over b.c. 2K4 and over similar circuits, not shown, points lock relays IV, 3V for points 1 and 3 are energized so that the latching of the armatures of the windings I of the relays 2V &c. is released and these armatures drop away and latch the attracted armatures of windings II and the contacts of these relays are restored to the positions shown. At f.c. 3V4, 2V4; 1V4, Fig. 6, and f.c. 3K3, 2K3, 1K3 and 5Q4 which are all now open, signal control relay 4S drops away and at f.c. 4S1 switches off the proceed lamp 4L, Fig. 7, of signal 4. On release of the exit button 5Z, at b.c. 5Z2, Fig. 5, relays 1H, 2H, 3H are de-energized and drop away and at b.c. 3H2, Fig. 7, the winding II of relay 5E is energized over b.c. 3V5, 5Q5 and fc. 5E7 and this relay is restored with its contacts to the positions shown. At f.c. 5E4, Fig. 4, the holding circuit of exit button repeat relay 5A is interrupted and the relay drops away, all the relays being then in the positions shown with the exception of relay 2R, Fig. 7, which remains in the reversed position because the points 2 have been reversed.