Patent GB-835955-A (GB)
Title: Improvements in or relating to interlocking plants for railway safety systems
IPC: B61L19/06
Filed: 1957-09-13
Abstract: 835,955. Interlocking plant for railway safety systems. SIEMENS & HALSKE A.G. Sept. 13, 1957 [Sept. 17, 1956], No. 28922/57. Class 105. In an interlocking plant for railway safety systems electronic switching elements such as those incorporating transistors or ferromagnetic elements, effect the storage and re-transmission of order signals and the indication or supervisory signals and the testing of interlockings in the establishing, supervision and release of train routes. The storage devices S-, e.g. SWFSR1, Fig. 4b, may take the form of bistable flip-flop circuits which provide an output of the same sign as the original input signal or a signal of opposite sign. The electronic switches may take the form of " AND " and " OR " gate circuits and NO " circuits, distributers and time delay elements. The " AND " gates, e.g. GTP3, GTP8, Fig. 4a, provide an output only when all the inputs to the gate are applied concurrently and these inputs may be decoupled from each other by, e.g. unidirectional conductor elements and serve for resting the track locking. The "OR"-gates, e.g. GTP11, GTP31, Fig. 4a, produce an output - in accordance with the application as regards times and amplitudes of one or more input signals. A "NO"-circuit, e.g. N1-N4, Fig. 4b, always provides an output potential with no input control potential. Distributers VT-, e.g. VTFS1-VTFS6, Fig. 4b, feed a control potential to a plurality of circuit elements. Each point has assigned to it a storage device SWL1- SWL5, Fig. 4e, which are shown in the home or 0-position corresponding to the left-hand position of the facing points as indicated in Fig. 1. These storage devices are brought into the alternative or 1-position on application of the necessary control potential to the input of the unhatched part when no control is effective at the input. The setting up of a route from station track B to main line a, for example, is initiated by the concurrent operation of the route entrance key 42 and route exit key 31, Figs. 1 and 4a. On operation of the key 31, the AND-gate GTP15, Fig. 4a, is opened, having been prepared for opening by the storage device STP, to apply potential to AND-gate GFT6 together with a potential on operation of key 42 so that this latter gate opens to supply potential to line LFA6 and at the same time AND gate GTP9 receives potential from key 42 through the OR-gate GTP2 and from key 31 through the OR-gate GTP1 and brings the storage device STP into the 1-position through the OR-gate GTP12, time delay device LZ1 and OR-gate GTP13, to block the feed-in gates GTP15-GTP20. The storage device STP is reset, when the keys 31, 42 return to the home positions; through the NO-circuit N6 when the OR-gate GTP10 supplies no further potential. The potential on line LFA6 opens the AND- gates GFZP6, GFZ6, Fig. 4. The other potentials applied to the inputs of gate GFZP6 are dependent upon points setting storage devices SWFSR1, SWFSL1, &c. concerned in the route, one for each position of each set of points. The gates GFZP6 and GFZ6 apply through the distributer VTFS6 control potentials to the lines VFWP6, points setting lines VWFS2, VWFS7 and VWFS9, points protection setting lines VWSA1, VWSA4 and VWSA5, and through the lines LSA7 and LSA8 to the shunting and main signal control storage devices (not shown). The points route setting storage devices SWFSL1, SWFSR4, SWFSR5, points protection order storage devices SWSA1, SWSA4, SWSA5, and the relevant said signal order storage devices are all brought to the 1- position. Potential for the necessary flank protection by the points W2, W3 is applied to the lines VWS4, VWS5, Fig. 4b and 4e, through AND-gates GSS1, GSS4, Fig. 4b, and distributers VTSS1, VTSS4 and the OR-gates GFSS2, GFSS3. Since storage-devices SWSA1, SWSA5 are in the 1-position the control potential on lines LSWSA5 and LSWSA1 which are applied to train route locking storage devices, not shown, disappears. Also as storage devices SWFSL1, SWFSR4, SWFSR5 are in the 1-position, the control potentials on the lines VFZP2, VFZP7, VFZP9, Fig. 4b, disappear and these storage devices supply control potential respectively through the OR-gates GFSS1, GFSS4 and directly to the lines VWS2, VWS7, VWS9. The potential on line VWS2 opens the AND-gate GWLP1 in the control arrangements of the points W1, Fig. 4e, to which gate the required points position " left " is indicated by the storage device SWL1, and the existing points end position-indication " left " is signalled through the line LL 1. The gate GWLP 1 brings the points locking storage device SWF1 into the 1-position through the OR-gate GWF1. The gate GWLP1 and the storage device SFW1 open the AND- gate GWLP(R)1 and, if control potential is present on line VNAS1, giving a points-free indication, the AND-gate GWLP(Z)1 opens. These two AND-gates apply control potential to lines VZW2 and VRW2 to effect points locking of points W1. Correspondingly the potential on line VWS4 brings about the application of control potentials on the lines VRW4 and VZW4 for locking the points W4. The potential on line VWS9 brings the storage device SWL5 into the 1-position through the OR-gate GWRTF5 and the AND-gate GWRFF5, thereby testing the 0-position of the points-locking storage device SWF5, the potential of which is applied to the gate and the free condition of points W5 by the potential from storage device SWFM5, Fig. 4d, on line VWAS9 (from Fig. 4d) which is also applied to the gate. The points W5 thus set into the required right-hand position by the device SWFSR5 is locked in that position by device SWF5. Should the points end position already indicate " right " through potential on the line LR5, the AND-gate GWRP5 opens with the potential on line VWAS9 and brings the storage device SWF5 into the 1-position through the OR-gate GWF5. Gate GWRP5 also applies potential to AND-gates GWRP(R)5 and GWRP(Z)5 which open and apply potential to lines VRW9 and VZW9 to effect shunting signal control and train-route signal control respectively. In dependence upon the control potentials on the lines VWS5, VWS7, the points W3, W4 are brought into the left-hand positions and locked in a corresponding manner, the points W3 acting as safety points. There is also control potential on lines VRW5, VRW7 and VZW5, VZW7 which open the AND-gates GRWP4, GRWP5 and GZWP2, GZWP6 to apply potential to the shunt route testing lines VRS(W)4, VRS(W)5 and the train route testing lines VZS(W)2, VZS(W)6. The potential on line VZS(W)2 brings a storage device for train route locking for the departure from track B to line a into the 1-position and changes control potential from the cancellation and emergency release heating lines to the train route locking lines. The potential on the line LGRSP4 through gate GRWP4 is instrumental along with potentials from shunting and main signal storage devices and potential representing essential route apparatus conditions in opening a gate which applies an order to operate the main signal S4 to proceed aspect without speed limitation. An off-normal contact of the signal acting device resets the signal storage device to the O-position. The signal S4 set to " stop " on the passage of a train is prevented from being again set to " proceed " before the route set has been completely released. When the points W5 are occupied, the associated storage device SWFM5, Fig. 4d, is brought to the 1-position and control potential then exists on line VWAS10, and through the AND-gate GWFMP9 brings the release order storage device SWA9 into the 1-position. The 1-position of device SWFM5 blocks the gate GWRP(Z)5, Fig. 4e, as a result of the disappearance of the control potential on line VWAS9 and line VZW9 receives no further control potential and gates GZWP2, and the corresponding signal control gate, are blocked and the signal S4 moves into " stop " aspect. When the points section W4 is occupied the storage device SWA3 is brought into the 1-position through the AND-gate GWFMP3. When points W5 have been freed the storage device SWA10 is brought into the 1-position through the AND-gate GWFMP10. The AND-gate GWA10 is opened and brings storage device SWFSR5 into the 0-position through the distributer VTWA4, the AND-gate GRV3 which tests the " stop " position of the main signal S4 through the contact rhS4 of that signal detector and the release line VWA10. When device SWFSR5 takes up its 0-position the shunting signal indication storage device (not shown) is reset over the line VSH4, Fig. 4b. Points protection storage device SWSA5, Fig. 4b, and the points lock storage device SWF5, Fig. 4e, are reset through the AND-gate GWGSP5, Fig. 4b, and line VWG5. The device SWF5 blocks the AND-gate GWRP(R)5, which in turn blocks the gate GRWP4, and the gate (not shown) to the shunting signal setting device over line LGRSP4, resulting in the shunting signal R4 Fig. 1, being reset to " stop." With devices SWFSR5 and SWFSL5 in the 0-position, the AND-gate GA13, Fig. 4d, is opened over lines VFZP9,10 and brings storage device SWA9 into the 0-position through the OR-gate GGWA5. The device SWA10 moves into the 0-position when points W4, W5 are cleared, since only then is the gate GWFMP10 blocked and the resetting potential applied through the OR-gate GGWA5 is able to become effective. When points W1 are occupied and the points W4 are free, the storage device SWA4 is brought into the 1-position through the AND-gate GWFMP4. The potential supplied through the gate GWA4 to the route-setting release line VWA8 resets the storage device SWFSR4. With devices SWFSR4 and SWFSL4 in the 0-position, device SWSA4 is reset through the AND-gate GWGSP4, Fig. 4b, and the points locking storage device for points W4 is reset over line VWG4 and the AND-gate GWBP4, Fig. 4b. The AND-gate GSS4, Fig. 4b, connected to the inverting outputs of the devices SWFSR4 and SWSA4 is blocked and the storage device of the safety points W3 receives a re-settin