Patent GB-358525-A (GB)
Title: Improvements in controlling apparatus for railway points, signals, and the like
IPC: B61L21/06
Filed: 1930-07-09
Abstract: 358,525. Railway signalling systems. WESTINGHOUSE BRAKE & SAXBY SIGNAL CO., Ltd., 82, York Road, King's Cross, London.-( Assignees of Brooks, C. A. ; 1429, Macon Avenue, Swissvale, Pennsylvania, U.S.A.) July 9, 1930, No. 20835. Convention date, July 18, 1929. [Class 105.] Electrical systems, non-automatic; signals and points, interlocking ; interlocking.-For the control of an electrically operated signal points or other traffic governing device, such as a signal S<1>, a normally open pushbutton contact U<1> is momentarily closed to effect the continued energization of a relay R<1> which controls the operation of the signal S<1> and is interlocked with corresponding relays, such as relay R<2>, for other devices and with relays, such as P<3>, K, T<2>, T<3>, controlled in accordance with traffic conditions. As described, the momentary closure of contact U<1> picks up a stick relay I<1> which is held over a circuit comprising a normally closed pushbutton contact U<2> and a track-relay contact 48T<2>; the stick relay I<1> effects the energization of the signal control relay R<1> which is electrically interlocked with relay R2 over front contacts of the stick relay I<1>, back contacts of other stick relays such as I<3>, and front contacts of approach-locking relays P<3> and track relays T<2>, T<3>. By actuating the normally closed pushbutton contact U<2> the signal is cancelled or, if a train has entered an approach section, the signal goes to danger but the apparatus is not in this case restored to its unoperated state. The Figure shows the arrangements for a double track with a cross-over, track relays T<1>, T<3>, T<4>, T<6> being provided for the approach sections and T2, T<5> for the detector or points sections. The cross-over is put to normal or reverse by means (not shown) controlled by a polarized points relay m which is normally or reversely energized according to the position of a manual contact Q. The points when home energize normally or reversely a polarized indication relay K. The signals S<1> .. S<6> are put to clear by normally open pushbutton contacts U<1>, U<3>, U<5>, U<6> and can be put to danger by normally closed pushbutton contacts U<2>, U<4>. The apparatus is shown in the unoperated position with the points normal, the points relay m being normally energized from source B over manual contact 30, contacts 31 .. 42 of detector track relays T<2>, T<5> and approach-locking relays P<1>, P<3>, P<5>, p<6>, and manual contact 43 to terminal 0. A stick circuit for the points relay m extends from a terminal B through a relay i, polar contacts 44 or 45 and any back contacts 31 .. 42. To clear the signal S<1> for a move to the right over track Y the button U<1> is pressed and picks up the stick relay I<1> which is held over its own contact 49 and contacts 48T<2> and U<2>. The signal control relay R<1> is then energized over a circuit from terminal B, through a relay rr<2>, contacts 54P<3>, 551<3>, 56, 57 of points indication relay K, 58J<1>, front contacts 59I<1>, 60T<2>, through a relay r<1>, contacts 61K, 62T<3>, 63, relay R', front contact 64I<1>, contacts 65, 66 of points indication relay K and contact 67I<3>. When the train passes through, the dropping of detector track-relay T<2> opens the stick circuit of the stick relay I<1> at contact 48T<2> and consequently' the signal goes to danger by the opening of front contacts 59I<1>, 64I<1> in its circuit ; further all the apparatus is now in the unoperated position shown, since the approachlocking relay P<1> which was de-energized at front contacts 5R<1>, 6I<1> is now picked up over back contact 8T<2> and held over its own contact 10. By depressing the button U<2> the signal is returned to danger since the stick relay I<1> and therefore the signal relay R<1> are both de-energized; the apparatus returns to the position shown unless a train has entered the approach section in which case the approach-locking relay P<1> remains de-energized at the dropped contact 7T<1>. The relay P<1> can be picked up by operating a time release contact 9J<1> and thereafter by depressing button U<3> a signal S<3> can be cleared for a movement to the left; the circuit to the control relay R<3> of this signal is from terminal B, through relay rr<3>, contacts 79P<1>, 59I<1>, 58J<1> (the time release having been returned), 57, 56 of points indication relay K, front contact 55I<3>, relay r<3>, relay R<3>, front contact 67I<3>, contacts 66. 65 and 64I<1>. If, when a train is being held in the section of track relay T<3>, the button U<1>. is depressed, a callon signal S<2> is actuated by the energization of signal relay R<2> over the circuit previously traced for relay R<1> as far as contact 61K, then over back contacts 62T<3> and 78 to relay R<2>. If the points are set to reverse by means of the device Q and the button U' is depressed, the signal S<2> is put to clear, the circuit to its control relay R2 being from terminal B through relay rr<1>, contacts 68P<5>, 6915, 70J<5>, front and reverse contacts 71, 72, 56 and 57 of points indication relay K, contact 58J<1>, front contacts 59I<1>, 60T<2>, relay r<1>, reverse contact 61K, contact 78, relay R2, front contacts 64I<1>, 65, reverse contacts 66, 75 of relay K, and contacts 76, 77I<5>. To restore the points operating device Q it is not necessary to wait until the train has left, since the points relay m is held by its stick circuit until the train has passed and only thereafter when the detector track and approach locking relays T<2>, T<5>, P<1>, <p3>, P<5>, P<6> are all energized, is this relay restored. To change the points setting after a train has entered the approach section the signal, for example S<2>, is put to danger by depressing the button U<2> and then the time release is actuated so that the relay P<1> is picked up over contact 9J<1> whereupon the points can be changed by actuating the device Q since the points relay m is then energized over its pick-up circuit; depression of button U<1> then puts the signal S' to clear. Indication lamps such as e<1>, ee<2> are lit when the corresponding signal such as S<1> is put to clear, and a lamp d is lit when the points relay m is energized by its stick circuit; these lamps are controlled by the auxiliary relays such as r<1>, rr<2>, i in the signal control and points relay circuits described above.