Patent GB-452980-A (GB)
Title: Improvements relating to traffic control systems for single line railways and the like
IPC: B61L23/24
Filed: 1935-03-02
Abstract: 452,980. Staff and ticket railway traffic control systems. ROGERS, W. D., 8, Walpole Road, Tottenham, LEVERSEDGE, G. H., 11, Blake Road, New Southgate, and SYKES INTERLOCKING SIGNAL CO., Ltd., W. R., 26, Voltaire Road, Clapham, all in London. March 2, 1935, No. 6599. [Class 105] To avoid the necessity of transferring the staff in a staff and ticket system working in the usual conjunction with block instruments there is provided for each end of the section a staff and a receiver ; the two receivers are so electrically interlocked that only one staff can be removed at a time, and such staff is used to obtain tickets as desired whereas the other staff remains locked in its receiver until all the tickets are in the two receivers and the first staff has been replaced. Fig. 4 shows one of the receivers. A staff, if free, can be withdrawn from an inactive aperture 4 and inserted in an active aperture 3 and turned to allow a ticket to be removed from an aperture 5. The staff is shown to the driver when the ticket is handed over. The turning of the staff in the aperture 3 closes a contact 71 which picks up a stick relay 72, Fig. 3, to allow the lock magnet 77 of the starting-signal lever to be energized on the closure of a catch-handle contact 76. The inter-control of the two receivers is shown in Fig. 1. Removal of insertion of a ticket moves a set of contacts 13 one step in the direction of the arrow O or I. A counting switch device 8 has an arm 11 to engage these contacts 13 and an arm 12 to effect closure of other contacts at various angular positions as denoted by the associated arcs. The receiver at A includes a set of counting relays 18... 14 so that the relay 14 will only be energized if all the tickets are in the receivers A, B. The apparatus is designed for eight tickets and is shown in the state with four tickets in each receiver, which is reflected in the angular positions of the two contact sets 13, and with the A staff withdrawn to establish the direction AB. When it is required to change to the direction BA the A staff is inserted in the inactive aperture 4 and is locked by the device 20; this staff then closes contacts 28 .. 31. Contacts 32, 33 lie as shown so long as the full number of tickets is not in the receiver A. The operator at A then steps the switch device 8 around by a ratchet drive through a handle 9 till the R position is reached. During this movement the arm 11 will apply potential from the positive supply point 39 only to the bottom four contacts 13 since, four tickets having been assumed withdrawn, the top four contacts 13 will have moved to a position where the arm 11 is no longer energized when they are reached. At the first contact 13 the relay 18 is picked up over wires 23, 40, back contact 18a, wire 41, back contact 16b, relay 18 and wire 43 to the negative point 44 ; the relay 18 then sticks by current from a positive supply point 39 over contact 28, contact XR (closed by arm 12 through the angular range X to R), back contact 14a, wire 47, front contact 18b, wire 41, back contact 16b, wire 42, relay 18 and wire 43 to the negative point. At the second contact 13 the relay 17 is likewise picked and stuck. At the third contact the relay 16 is picked and stuck, this action causing relays 18 and 17 to drop since their stick circuits include the back contacts 16b, 16a. At the fourth contact 13 the relay 15 is picked and stuck, incidentally dropping the relay 16. During the latter part of the stepping movement the contact Y is closed whereby positive current is sent from a point 39 over contacts 29, Y, to the line wire 1 and so to the receiver at B where a polar relay 26 then moves its contact 53 to pick up a stick relay 27 whereby an indicator 7 is energized. The operator at B, thus notified, steps his switch device 8 but not until the fifth stud 13a is reached is current applied to the line wire 1. This is due to the contact segment 11<1> of arm 11 not engaging the contact 84 until a position is reached corresponding to the arm 11 overlying the sector Z. This line wire current is positive from a supply point 24 and is applied over stud 13a, arm 11, segment 11<1>, contact 84, wire 59, front contact 60 of the stick relay 27 and a contact 35 (B staff locked in aperture 4) and accordingly causes the polar relay 19 at A to set its contact 62 to the left. The relay 18 is thus picked up and stuck as before since the wire 23 is at positive potential over the contact 62. The next line current sent from B is negative from the supply point 25 and thus the polar relay 19 at A sets its contact 62 to the right thereby applying potential to the wire 48 to pick up the relay 17. The third line current is positive and so causes relay 16 to be picked up and stuck but this time only the relay 18 is dropped by the relay 16 since a stick circuit for the relay 17 now exists over a front contact of the relav 15. The fourth line current is negative and energizes the relay 14 by the application of potential through right-hand contact 62 to wire 48, front contacts 17c, 15c, wire 63, back contact 18d and wires 64, 65 to the relay 14. The relay 14 sticks over back contact 18d and its own front contact 14a. The lifting of the relay 14 opens the stick circuits of relays 17 and 15, and also energizes an indicator 7. Relay 14 is thus energized only if the full number of tickets are in the two receivers. The operator at A is notified by the indicator 7 and therefore depresses his push 21 to apply negative current to the line wire from a supply point 44 over front contact 14c and contact 30 (staff locked in at A). This negative current energizes the polar relay 26 at B to set its armature 53 to the right thereby energizing the lock relay 20 to free the staff at B. Both receivers are now stepped further forward to the N positions as a contact Nbl must be closed to free the starting signal.