Patent GB-419652-A (GB)
Title: Improvements in and relating to systems for controlling traffic on railways
IPC: B61L23/24
Filed: 1934-05-24
Abstract: 419,652. Controlling traffic on railways. TYER & CO., Ltd., and LEAKE, F. W., Ashwin Street, Dalston, London. May 24, 1934, No. 15527. [Class 105.] Tokens for " up " or " down " travel in a single or double track railway or for trolley occupation are altered in configuration to denote the direc. tion of travel authorized and can only be withdrawn from the apparatus when the configuration denotes travel towards the other end of the section. The tokens can only be inserted in the apparatus at the end to which they are to travel and their configuration can be altered only while they are in the apparatus. The token shown in Fig. 1<a> has an internal spindle 4 locked to the main shank 3 by a pin. tumbler lock 7 and adapted to expose the words "UP" or " DOWN " through an aperture in the shank according to the angular position of the spindle. The internal spindle 4 at the end adjacent the sector lug 2 of the shank is formed with a cross slot which must be positioned at one angular setting with respect to the sector lug 2 for insertion in the apparatus and at a different angular setting for withdrawal from the apparatus. The change of the angular setting is effected by means of the lever 11, Fig. 4<e>, which is hinged on the casing of the token apparatus and carries pins 12 to release the pin-tumbler lock 7 so that the shank 3 can be turned relatively to the spindle. The lever 11 carries a claw 14 which engages over a ring 6 on the shank 3 and can only be removed through slots in such ring provided at the correct angular positions Fig. 5 shows the electrical control arrangements for issuing tokens for a double track railway. For a token to be issued at a station X authorizing travel to a station Y, the operator at X signals by bell code whereupon the operator at Y depresses his push 24Y to apply a positive current to line wire a over drum commutator 1Y. This current passes by segments 5X, 6X of a drum commutator 2X and segments 4X, 11X (when the operator at X has started to withdraw the token and so has moved the commutator 90‹) to a polarized relay 20X which then applies battery 27X to a magnet 21X, whereby the drum commutator 2X is released for rotation to the 180‹ position. The token can now be withdrawn, it being understood that the token must have its internal spindle correctly set so that the slot can receive a key on the drum to allow the axial inward movement of the token required for its sector lug to pass a stop member in the channel of the apparatus. This stop member also prevents incorrect turning of the token. The change over of the drum commutator 2X reverses the connections to the polarized relay 21X so preventing the issue of a further token. When the train reaches station Y the token is inserted and reverses the drum commutator 1Y so that now a further token can be issued at X since the two reversed commutators 1Y and 2X normalize the current flowing to the polarized relay 21X. For travel on the other track the tokens are controlled by the drum commutators 2Y, 1X which are independent of the first pair 2X, 1Y and therefore tokens can be simultaneously issued for the two tracks. Polarized indicators with the needles held at the last operated position show the block conditions. Fig. 7 shows an arrangement for issuing tokens authorizing a trolley to occupy the up or the down line of an outdoor-signal doubletrack railway. When a track is in the " line blocked " condition a contact such as 22Y at the exit end of that track is closed at the block instrument. To allow a trolley on the " up " track, that is from X to Y, the operator at Y after being called moves over a hand switch 15Y and depresses a push 19Y whereby the positive of battery 23Y is applied to the line a over switch arm 24Y in the dotted position. This current operates a polarized relay 27X at station X to close its right hand contact, whereupon the battery 23X energizes the token release magnet 2X over drum segments 3X (the operator at X having started to withdraw the token) and the drum can now be rotated to the full 180‹ position and the token withdrawn. The hand switch 15Y at the dotted position breaks the circuit of the magnet 18Y so that the switch 15Y cannot be returned to release the block instruments for normal working until a token has been inserted at the station Y or at an intermediate post on the " up line. The insertion of a token at station Y operates a cam 14Y to close briefly a contact 29Y whereby a relay 30Y is picked up, the armature 31Y then feeding a stick winding 32Y and also the switch-arm lock magnet 18Y. The switch arm 15Y can now be returned to restore the block working. If the token is inserted at the " up intermediate post and the push 4U depressed, then a positive current is applied to the line a by the battery 3U to energize the polarized relay 27Y at Y which effects the energization of lock magnet 18Y. To release the token from the " up " intermediate post the station Y must apply a positive current to the line a in the manner described above so that the polarized relay 7U (when the token has been partly operated to close segment 8U) can close the circuit of lock magnet 6U whereupon the token can be turned fully and withdrawn. It will be seen that the switch arm 15Y cannot be moved from the normal position unless the block instruments are in the " line blocked " condition to close contact 22Y. The arm 15Y when at the reverse position may cause the block instruments to indicate that the section is occupied. When the " up " token has been inserted at Y its configuration is changed, by using the lever key 10Y, to that of a " down " token. In all cases the token must have the correct configuration before it can be withdrawn or inserted in the apparatus. Specification 23417 /12, [Class 105], is referred to.