US1824127A - Interlocking system for railroads - Google Patents

Description

Sept. 22, 1931. F. DODGSON INTERLOCKING SYSTEM FOR RAILROADS Filed March 20, 1930 ATTORNEY Patented Sept. 22, 1931 UNITED STATES rmx L. DODGSON,,OF ROCHESTER, NEW YORK, ASSIGNOB 1'0 GENERAL RAILWAY SIGNAL COMPANY, OF ROCHESTER, NEW YORK INTEBLOGKIHG SYSTEM FOR RAILS/DADS Application filed March 20, 1980. Serial No. 487,472.

This invention relates to power interlocking systems, and more particularly pertains to the remote control of switch machines and signals used in such systems, and to the elec- 5 tric interlocking between such remotely controlled functions.

In interlocking plants, where a large number of switch machines and signals are governed from a central tower, it is desirable for m reasons familiar to those skilled in the art, to have those signals governing trafiic over a particular track switch dependent upon the position and locked condition of that switch. It is further desirable that all such governing signals shall give their most restrictive indications before the associated track switch is allowed to be operated to a new position.

Also, in interlocking plants, any one articular track section may be included in a go large number of the possible route combinations, which makes it desirable to provide each of the signals, controllin trafiic over a given section, with individua control. In other words, the clearing of the signals governing a certain route may be dependent and interlocked with the associated switch machines and still be dependent upon individual control to establish the final clearin and the direction of traflic to be set up over t at route,

as distinctive from that type of remote control in which the se uence of operation and the presence of a train establishes the direction of traflic over a van route.

With the above an other considerations in mind, it is proposed to provide in accordance with the present invention an interlocking system of the remote control ty e having the switch machine and si al circuits interlocked to revent contro of the switch machine unt the associated signals give most restrictive indications. The interlockin system is to be further provided with indivi ual control of the signals, which control is also interlocked with the associated switch machine. Also, the switch machine remote control circuit is to be organized to prevent the control lever in the tower from be 0 erated out of correspondence'with the circuit controlling relay associated therewith. V

5 Another object of the invention, is to provide that the relay indicating the position and locked condition of a particular track switch, shall also indicate the correspondence of the remote control relay, the remote controller and the signals with the position and locked condition of that particular track switch.

Various other objects, purposes and characteristic features of the present invention will be in part obvious from the accompan ing drawing, and in part pointed out as t e description of the invention progresses.

The single figure of the accompanying drawing represents in a diagrammatic manner one specific interlockin system with its circuits and devices arrange and constructed to embody the present invention.

With reference to the single figure of the drawing, a track switch TS is conventionally shown as operated b a suitable switch machine included within the dotted rectangle SM. This switch machine SM is preferabl of the type described in the patent to W. Howe Patent N 0. 1,466,903, dated September 4, 1923, but may be any other suitable switch machine having the usual armature A and field windin F and being capable of operating said trac switch TS to either of two extreme locked positions. Also, included within the switch machine SM is a brake BR normally biased to a braking position and included within the operating circuit of the switch machine SM, so that it will be actuated to a released condition upon the application of wer to said switch.

movable contact 5, which makes contact between a pair of fixed contacts when in a normal position and a certain other pair of fixed contacts when in the reverse position, is caused to assume these positions in correspondence with the switch machine SM at the end of each of its 0 tiona.

The contacts, shown wnhin a dotted rectangle designated PD, are known as point detector contacts, and include a movable contact block 6 of insulating material which is caused to assume extreme normal or reverse positions when the track switch T8 is in corresponding positions and locked; and which is caused to assume an poli- Ill tion when the track switch TS is being 0 rated from one extreme position to anot er, or any other such time that said track switch is unlocked. Contacts 7 and 8 are mounted on this movable contact block (5, which make contact between their respective pairs of fixed contacts when in the normal or reverse extreme positions only.

The point detector contacts PD include, a shunt contact 9 which is actuated to a noncontacting position when the contact block 6 is in a normal extreme position and assumes a biased contacting position at any such time that said movable contact block 6 is not in an extreme normal position; and also, a shunt contact 10 which is actuated to a noncontacting position when the movable contact block 6 is in a reverse extreme position and assumes a biased contacting iosition at any such time that said movab e contact block 6 is not in an extreme reverse position.

Associated with the switch machine SM is a circuit controller OR of. the mechanical stick or toggle type circuit controller which is operated by a control relay Z which in turn is controlled from the interlocking tower TR. The conditions, under which the remote controller CR may be operated, are determined by the positions assumed by a switch repeater relay SR and normal and reverse indication repeating relays N1 and RI respectively associated with t ie contacts PD.

A normal operating coil NC and a reverse operating coil RC serve to operate a plurality of contacts of the controller OR to corresponding normal or reverse positions respectively, in which positions said contacts are both electrically and mechanically held until the next succeeding operation.

The track switch TS allows trafiic to be routed over the main track represented by rails 1, or allows traffic to be routed onto a passin siding PS represented by rails 2. A detector track section TE is associated with the main track and the fouling portion of the passing siding and has the usual track batter 13 and track relay T. At the west end 0 the detector track section TE, signals and 8*, each being capable of giving two or more indications, govern the trafiic passing in an east bound direction over the main track or the passing siding respectively, in accordance with the position of the track switch TS as indicated by the indication relays N1 and RI, and also in accordance with the position of a remotely controlled relay Z which is controlled from the tower TR.

Associated with the track relay T and the remotely controlled relays Z is a section locking relay SLR which is energized through a circuit including the front contact of the track relay T and such other relays, for example, as approach locking relays, route locking relays, and the like, (not shown) commonl used in interlocking circuits. he relay 1 is of the polar magnetic stick type, that is, when its contacts are operated to an extreme position, they are held in that position by a ermanent magnet. Similarly, the relay Z is of the polar-neutral type in which the polar contacts operate the same as the polar contacts of relay Z, and in which a neutral contact assumes the same actuated position each time that the relay Z is energized.

In the interlocking tower represented by the dotted rectangle TR, a miniature track diagram corresponding in every particular to the actual track layout of the interlocking plant includes a miniature passing siding ps and detector track section te. An indicator light I, located above the track section te, indicates the occupancy of the detector track section TE associated therewith.

A switch machine lever SML is provided for controlling the track switch TS from the tower. This lever SML operates a switch of the two-position quick acting tumbler type having a lock L which, when deenergizcd, prevents movement of the switch contacts to a new position. The )osition of the lever SML determines the application of positive or negative potential upon a control circuit including an indication relay IR from any suitable source such as battery BT haviug its midpoint connected to a common wire C. A signal lever SL operates a switch of the three-position type for placing positive or negative potential from any suitable source such as battery BT upon the control circuit of relay Z located at the switch machine for governing the signals S and S It will be noted, that throughout the description of this embodiment of the present invention. that the opposite terminals of all sources of electrical potential will be designated as 13+ and B-, which sources may be the same sources of supply or other suitable sources all in accordance with the practical application of the invention. It is to be understood that these sources of electrical potential are preferably local to the points indicated, also that they may be either direct current or alternating current according to the circumstances to be met in practice.

It is believed that the usefulness of the system and the interrelated functions of the various circuits and devices will be more readily understood by further description being given from the standpoint of the operation of the interlocking system taken as a whole.

Operation of the system train to proceed in an east bound direction Inn over the track section TE, when the signal lever SL is in a right-hand extreme position.

With the track section TE unoccupied, the track relay T is energized by the battery 13 in the usual well known manner, w ich causes the front contact 15 of said track relay T to complete the circuit for the section locking relay SLR. This energizing circuit is traced as follows :from the positive terminal of a suitable source of electrical potential indicated as B+, through front contact 15 of track relay T, wire 16, winding of relay SLR, to the negative terminal of the suitable source indicated as B- The section locking relay SLR governs the normal and reverse energizing circuits of the remote controlled relay Z. The normal energizing circuit of this relay Z is traced as follows :from the positive terminal of battery BT, through wire 18, lever SML in a right-hand extreme position, wire 19, winding of the indicating relay IR, wire 20, front contact 21 of relay SLR, wire 22, winding of rela Z wire 23, front contact 24 of relay SL through the common wire C to the midpoint of the battery ET. The control relay Z has its polar contacts thus energized to right-hand extreme positions.

With the polar contact 25 of relay Z in a right-hand extreme position, the ener izing circuit of the switch repeating relayl R is completed which also includes the olding circuit of the circuit controller CR. This normal energizing circuit for relay SR is traced as follows :from the positive terminal of a suitable source of electrical potential indicated as B+, through back contact 26 of indicating relay RI, wire 27, polar contact 25 of rela Z in a normal position, wire 28, winding C of circuit controller CR, wire 29, contact 30 in a left-hand normal position, wire 31, contacts 7-32, wire 33, shunt contact 10, wire 34, winding of relay SR wires and 36, contacts 8-37, wires 38 an 39, to the negative terminal of the suitable source indicated as B- The energizing circuit for the relay N1 is completed, as the neutral front contact 40 of relay SR is in an energiz 'tion and the polar contact 41 of relay SR is in a left-hand normal extreme position, which ener circuit is traced as follows :-from the positive terminal of a suitable source of electrical potential indicated as B through front contact 40 of relay SR, wire 45, polar contact 41 of relay SR in a left-hand position, wire 46, winding of relay NI, wire 4 back contact 48 of relay III, to the negative terminal of the suitable source indicated as B.

The signals 8 and S are interlocked through contacts on the relays NI and R1 in a manner that the signal S me be cleared when the track switch TS isin a. normal lockedpoeition,mdtheeignsls'meybe cator lamp I. This is accom cleared when the track switch TS is in a reverse locked position. Thus, should the o erator at this time move the control lever to a ri ht hand position, the remote control relay would be energized and complete the energizing circuit for clearing the signal S.

Let us assume that the operator moves the signal lever SL to a right-hand extreme position, which ener 'zes the relagaz' from the positive termina of battery T, through 49, lever SL in a right-hand extreme position, wire 50, winding of relay Z, common wire C to the midpoint of battery ET. The circuit for clearing signal S is now completed with the front contact 51 of relay Z in an energized osition. This circuit is traced as follows rom the positive terminal of a suitable source of electrical potential indicated as 3+, through front contact 51 of re lay Z, wire 52, polar contact 53 of relay Z in a right-hand position, wire 54, back contact 55 of relay RI, wire 56, from contact 57 of relay NI, wire 58, through the control devices of ex nal S, to the negative terminal of the suitab e source indicated as B-.

If a train accepts signal S and passes onto the track section TE, the fact is indicated in the tower TR by the illumination of the indilished by the deenergization of the track re ay T which in turn 0 ns the circuit of the section locking rela LR. The dropping ,of the front contacts 21 and 24 of the rela SLR opens the normal energizing circuit o ;the relay Z and shunts the winding of this relay through wire 22, back contact 21 of rela SLR, wire 59, back contact 24 of relay SL wire 23, to the opposite side of the winding oi relay Z. The openinglszf the energizing circuit for the relay Z a opens the ener ing circuit of the indicating relay IR whic causes its contact to assume a deener zed position illuminoting the indicator lig t I from the positive terminal of a suitable source of positive potential indicated as B through back contact 65 of relay IR, wire 66, indicator lamp I, to the negative terminal of the suitable source indicated as B With the indicating relay IR deenergized, the lock L is deenergized due to the openin of front contact 65 as is obviwire ous from the rowing, which condition causes its locking member 82 to assume a position reventlipfi movement of the switch machine ever S Let us now assume that there is no train on the track section TiE and that the various route lockin other similar locking relays and track relay are in ener 'tions, so that the section locking role is ener- The indicator relay is now enerso that the locking member 62 of the ock L is actuated to an inactive position. Also, let us assume, that the operator moves he switch machine control lever SML to the hand position which energizes the relay III Z with negative potential through a circuit traced as follows :from the negative terminal of battery BT, through wire 67, lever SML in a left-hand extreme position, wire 19, winding of relay IR, wire 20, front contact 21 of relay SLR, wire 22, winding of relay Z, wire 23, front contact 24 of relay SLR, common wire C, to the midpoint of battery BT'. -\\'ith the reverse energizing circuit coniplcted for the relay Z, its polar contacts and T0 are caused to assume a left-hand extreme position which opens the holding circuit. of the controller CR and deenergizes the relay HR at the polar contact 25. The polar contact of relay Z, thus con pletes the energizing circuit of the coil Rb for controlling the contacts of the circuit controller (R to right-hand extreme ositions, as soon as both the relays NI and 151 assume deenergized positions. This energizing circuit for operating coil RC is traced as follows from the positive terminal of a suitable source of electrical potential indicated as 13+, through back contact 71 of relay NI, wire 72, polar contact 70 of 'relay Z in a left-hand extreme position, wire 73, 'coil RC, wire 74, contact 7 5 of circuit controller CR, wires 76 and 77, front contact 78 of relay T, wire 79, front contact 80 of relay SLR, wire 81, back contact 82 of relay NI, wire 83. back contact 84 of relay RI, to the opposite tcrminal of the suitable source indicated as B. It will he noted that the contact 75 is a breakeyond-center contact, which insures that the mechanical toggle arrangement will cause the reverse contacts to he made.

The contacts of the circuit controller CR are now operated to right-hand reverse extreme positions, in which positions a circuit is completed for operating the switch machine SM to a reverse position and thus control the track switch TS to a corresponding position. This reverse operating circuit for the switi h machine SM is traced as follows from the" positive terminal of a suitable source indicated as 13+, through contact 85 of circuit controller GR in a right-hand reverse position, wire 86, armature A, wires HT and 88, contacts 5-89, wire contact 91 of circuit controller GR in a right-hand reverse position, wire 92, field winding F, wire 923, winding of brake BR, to the opposite terminal of the suitable source indicated as B The switch machine SMnow unlocks the track switch TS and operates it to a reverse extreme position in the usual well known manner. at the completion of which the movable contact 5 is operated to a reverse position opening the energizing circuit of the switch machite at contacts 5-89.

As soon as the switch machine SM unlocks the track switch TS. the normal energizing circuit of the switch re eating relay SR is further opened due to t e operation of the point detector contacts PD. The movable contact. block 6 is operated to an intermediate position which causes the normal energizing circuit of the relay SR to he further opened at the contacts 7-452 and 837. Also, the shunt contact 5) assumes a contacting position thus shunting the relay SR from its left-hand terminal through Wire 35, shunt contact S1 in a contacting position, wire 94, shunt contact 10 in a contacting position, wire Ill, to the leftshand terminal of relay SR, which causes the neutral contact 40 to assume a dccnergized position during the operation of the track switch TS or at any such time that it is unlocked.

It will he noted, that should the operator fail to return the signal control lever SL to a central position, the signal S would be put to stop immediately as soon as the control relay Z reached a new governing position, due to the deenergization of the switch repeating relay SR and the normal indicating relay NI. In other words, the clearing of a signal depends u on the energization of either relay NI or I and the deenergization of one of them, while the operation of the switch machine depends upon the deenergization of both of said relays.

When the track switch TS has been operated to an extreme reverse locked position, the movable contact block 6 is operated to an extreme reverse position and the shunt contact 10 is actuated to a non-contacting position, which completed the reverse cner izing circuit for the switch repeating relay S l and included therewith the reverse holding circuit of the circuit controller OR.

The reverse energizing circuit for the switch repeater relay SR is traced as follows :from the positive terminal of a suitable source of electrical potential indicated as 13+, through back contact 71 of relay NI, wire 72, contact 700i relay Z in a left-hand position. wire 73, reverse operating coil RC, wire 74, contact 75 in a right-hand reverse position, wire 98, contacts 8-99, wire 100, shunt contact 9 in a contacting position, wire 35, winding of relay SR, wires 34 and 101, contacts 'i'102, wire 38 to the negative terminal of the suitable source indicated as B As the current in the winding of relay SR is flowing in a reverse direction, the polar contact 41 is actuated to a right-hand reverse position, after which the neutral contact 40 is actuated to an energized position. The reverse indicating relay BI is now energized through a circuit traced as follows :from the positive terminal of a suitable source of electrical potential indicated as B+, through front contact 40 of relay SR, wire 45. polar contact 41 of relay SR in a right hand position, wire 103 windin of relay RI, wire 104- hack contact 105 of reIay NI, to the negative terminal of the suitable source indieated as B.

With the reverse indicating relay RI energized, the signal S' may be caused to give a proceed indication for the passage of traffic in an east-bound direction over the track switch TS onto the passing siding PS. This is accomplished by the movement of the control lever SL to a left-hand position which places negative potential upon the control relay Z from the negative terminal of battery BT through wire 106, lever SL in a left-hand position, wire 50, winding 0 relay Z common wire C to the mid-point of battery ET. The polar contact 53 of control relay Z is now actuated to a lefthand reverse position and the neutral contact 51 is actuated to an energized position, which completes the circuit for signal S. This energizing circuit for the I signal S is traced as follows :-from the positive terminal of a suitable source of electrical potential indicated as B+ through front contact 51 of relay Z wire 52, polar contact 53 in a left-hand position, wire 107, front contact 108 of relay RI, wire 109, back contact 110 of relay.NI, wire 111, through the control devices of signal S", to the negative terminal of the suitable source of potential indicated as 13-.

Assuming that a train passes onto the detector track section TE, thence over the track switch TS onto the passing siding PS, the track relay T is deencrgized in the usual manner which results in the deenergization of the indicator relay IR. and the lever lock L in the same manner as heretofore explained. Thus, indication is given in the tower of the passage of a. train over the detector track sect'on TE by the illumination of the indicating lamp I. Also, the switch machine control lever SML is prevented from being operated to a new position with the locking member 62 of lock L in an active position.

Assume the detector track sections to be unoccupied, then the control lever SML may be returned to its normal position, thus controlling the track switch TS to its normal position in an operation which is merely an inverse function of the operation of the system from the normal condition to reverse condition'as just described in detail.

From the above descri tion, it is obvious that the governing signal S and S cannot give clear or proceed indications during the operation of the switch machine SM, or conversely, the switch machine cannot be oper-' ated unless said governing signals display their most restrictive indications. In other words, as soon as the'switch machine control lever is operated to a new position, the polar contacts ofthe control relay Z are operated to new positions which opens the circuit of the normal and reverse indication repeating relays NI and RI which must then assume deenergized positions before the switch maf establishment of the several routes.

chine circuit controller CR can be operated. When the indication repeatin relays N1 and RI assume deenergized positions to permit the operation of the circuit controller OR, the clearing circuits for the signals S and S are necessarily open at a front contact.

The above description points out the various conditions governing the signals S and S which are involved in the manuiil n other words, the signal circuits are interlocked with the associated switch machine control to prevent the false or improper clearing of a signal and to provide that it shall give its most restrictive indication before the established route may be changed.

The signals are also under the control of an operator. which control allows the signals to be caused by the operator to give most restrictive indications at any time, and allows the circuits to be conditioned b the operator for the signals to give clear in ications when the remaining conditions, not under the control of the operator, are such as to permit the clearing of the signals. These remaining conditions include those established by the interlocking as pointed out above and also preferably include conditions established in accordance with the traflic passing through the established route. Such traffic conditions govern the signals by automatic control means operated by the track circuits of the various routes, which automatic means is associated with the signals in a manner well known in the art, and is omitted for the sake of simplicity in the present disclosure.

By the provision of the lever lock L, the operations of the switch machine control lever SML and the control relay Z are coordinated although the intervening control circuits are open at certain times for transmitting the indication of detector track section occupancy. Also, premature switch machine lever movement is prevented before the associated track switch is in condition to receive such control.

It may be further noted, that the switch repeating relay SR not only indicates the position and locked condition of the track switch TS, but also indicates the correspondence of the circuit controller CR and the control relay Z with said switch TS. This interlocking of control operations and indication condiiions pre ents the clearing of any governing signal to permit the passage of a train, when any one of said elements are out of correspondence, which lack of correspondence might otherwise result in the operation of the track switch to an unlocked condition without proper authorization during the passage of a train.

Having described rather specifically an interlocking system embodying the present in- 6 1,sa4,1a1

vention, it is to be understood that the various circuits and devices included in this embodiment are used to facilitate in the disclosure of the invention, rather than to determine the s ecific nature and scope of the invention;

a so, it is to be understood that various modi-'.

fications, adaptations and alterations may be made to the interlocking system embodying the present invention to meet the varying reuirements of practice without departing Irom the spirit or scope of the present invention, as set forth in the appended claims.

Having described my invention, 1 now claim 1. In an interlocking system for railroads, a track switch having a detector track section a switch machine for operating said track switch, a control lever, a control relay for governing said switch machine said relay being controlled by said control lever, means indicating in the tower the occupancy of said detector track section and locking means preventing movement of said control lever to a new governing position during the indication of occupancy of said detector track section.

2. In an interlocking system for railroads, a track switch having a detector track section, a switch machine for operating said track switch, a control lever, a control relay for governing said switch machine, said relay being controlled by said control lever over a polarized line circuit, an indicating relay included in series in said polarized line circuit,

means for breaking said polarized line circuit during occupancy of said detector track section, whereby both said control and said indicating relays are deenergized, and locking means effective to prevent movement of said control lever to a new governing position when said indicating relay is deenergized.

3. In an interlocking system for railroads, a track switch, a switch machine having normal and reverse operating circuits, a two-position circuit controller for closing said operating circuits, a two-position control relay governed from the tower, means causing said circuit controller to be operated to a position in correspondence with said control relay, an indication relay giving indication of the correspondence of said control relay and said circuit controller with said track switch, holding circuits for said circuit controller including said indication relay completed when said track switch is in correspondence with said control relay and said circuit controller, and signals governed b said indication relay.

4. in an interloc ring system for railroads. a track switch, a switch machine, a circuit controller for controlling said switch machine, a control relay operated from a distant point for controlling said circuit controller, a plurality of relays indicating the position and locked condition of said track switch and also thecorrespondence of said control relay and said circuit controller with said track switch, a plurality of signals governing traific over said track switch and selected by said indication relays, means preventing operation of said circuit controller until said indication relays 've indication'of the non-correspondence 0 said control relay with said circuit controller, and means, including said indication relays, for insuring the non-selection of said signals except when said control relay and said circuit controller are in correspondence with said track switch.

5. In an interlocking system for railroads, a track switch, a switch machine having normal and reverse operating circuits, signals governing traffic over said track switch, a two-position circuit controller of the mechanical stick type for controlling said switch machine a two-position relay operated from a remote point, said relay operably governmg said circuit controller, an indication relay giving one indication when said track switch is in a normal locked position with said control relay and said circuit controller in correspondence therewith, giving another indication when said track switch is in a reverse locked position with said control relay and said circuit controller in correspondence therewith, and giving a third indication when said track switch is unlocked or when either said control relay or said circuit controller is out of correspondence with said track switc two indication operating relays, one of which is energized when said indication relay gives said one indication, the other of which is energized when said indication relay gives said other indication, and both of which are deenergizing when said indication relay gives said third indication. means preventing the operation of said circuit controller except when both said indication repeating relays are deenergized. and means preventing the clearing of said signals when both of said indication repeating relays are deenergized.

6. In an interlocking system for railroads, a track switch, a detector track section associated with said track switch, a switch machine for operating said track switch, a control lever, a control relay governed by said control lever over a polarized line circuit for causing said switch machine to operate, signals governing trailic over said detector track section, manually controlled means for clearlng said signals, means causing said manually controlled means to be inefi'ectivc to clear said signals when said switch machine is in operation, and means preventing the operation of said switch machine during occupancy of said detector track section.

7. In a railroad traiiic controlling system, a track switch, a switch machine for operating said track switch, a two-position circuit controller for governing said switch machine, a remotely controlled relay, operating circuits for said two-position circuit controller governed by said remotely controlled relay, holding circuits for said two-position circuit controller governed by said'remotely' controlled relay, a detector track section, means opening the operating circuits of said twoposition circuit controller when said detector track section is occupied, and means preventing operation of said remotely Controlled relay when said detector track section is occupied.

8. In a railroad traflic controlling system, a track switch, a switch machine foroperating said track switch, a two-position circuit controller for governing said switch machine, a remotely controlled relay, operating circuits for said two-position circu t controller governed by said remotely controllcd relay, holding circuits for said two-position circuit controller governed by said remotely controlled relay, a detector track section, means opening the operating circuits of said two-posltion circuit controller when said detector track section is occupied, and means preventmg the opening of said holding circuits for said two-position circuit controller when said detector track section is occupied.

9. In a railroad trafllc controlling system; a track switch; power actuated means for operating said track switch; an electro-responsive device for governing said power actuated means, said device being remotely controlled; indication means for indicating the position and locked condition of said track switch, said indication means being responsive to the correspondence between said electro-responsive device and said track switch; and signals governed by said indication means.

10. In a railroad trafiic controlling system a track switch operable to normal or reverse extreme positions; a power actuated means for operating and locking said track switch in either of said extreme positions; a manually controlled electro-responsive device for governing said power actuated means; point detector contacts operated by said track switch to opposite extreme positions in accordance with the normal or reverse extreme position of said track switch and actuated to intermediate positions when said track switch is unlocked; an indicating relay; operating circuits for said indicating relay governed by said point detector contacts and said manually controlled electro-responsive device, whereby said indicating relay is caused to indicate the condition of corres ondence between said manually controlled elbctro-responsive device and said track switch and also to indicate the normal or reverse position of said track switch together with its locked or unlocked condition; and signals selected by said indicating relay.

11. In a railroad trailic controlling system, a track switch, a switch machine for operating said track switch, a circuit controller for governing said switch machine, point detector contacts operated by said track switch and said switch machine jointly, a remotely controlled relay, an indication relay, operatin circuits for said circuit controller governs by said indication relay and said remotely controlled relay, holding circuits for said circuit controller governed by said remotely controlled relay and said point detector contacts said holding circuits including said indicating relay, whereby said indicating relay indicates the position and locked condition of said track switch together with the condition of correspondence between said remotely controlled relay and said circuit controller with said point detector contacts, and signals selccted by said indicating relay.

12. In a railroad tra c controlling system, a railroad track switch, power actuated means for operating said track switch, an electroresponsive device for actively governing said power actuated means when said electro-responsive device is operated out of correspondence with said track switch, indication means indicating the position and locked condition of said track switch, means causing said indication means to give an indication corresponding to the unlocked condition of said track switch when said electro-responsive device is'actuated out of correspondence therewith, and trafiic controlling means governed by said indication means.

13. In a railroad trafiic controlling system, a railroad track switch, power actuated means for operating said track switch, an electro-responsive device for actively governing said power actuated means when said electro-responsive device is operated out of correspondence with said track switch, indication means indicating the position and locked condition of said track switch, means causing said indication means to give an indication corresponding to the unlocked condition of said track switch when said electro-responsive device is actuated out of correspondence therewith, and means preventing said electro-responsive means from actively governing said power actuated means until said indication means gives an indication correspondin to the unlocked condition of said track swltch.

14. In a railroad trafiic controlling system, a railroad track switch, power actuated means for operating said track switch, an electro-responsive device for actively governing said power actuated means when said electro-responsive device is operated out of correspond ence with said track switch, indication means indicating the position and locked condition of said track switch, means causing said indication means to give an indication corresponding to the unlocked condition of said track switch when said electro-responsivedevice is actuated out of correspondence therewith, means preventing said electro-responsive means from actively governing said pow- \l actuated means until said indication means gives an indication corresponding to the unlucked condition of said track switch, and other traflic controlling means governed by said indication means.

L). In an interlocking system for railroads, :1 track switch, a switch machine for operating said track switch, means for controlling said switch machine, signals governing trafiic over said track switch, means for manually clearing said signals, means causing said signals to give most restrictive indications upon operation of said means for controlling said switch machine irrespective of said means for manually clearing said signals, means requiring said signals to give most restrictive indications before said switch nmchine can be controlled by said means for controlling said switch machine, and means preventing operation of said means for controlling said switch machine during the passa e of traffic over said track switch.

n testimony whereof I aflix my signature.

FRANK L. DODGSON.

15. In an interlocking system for railroads, a track switch, a switch machine for operating said track switch, means for controlling said switch machine, signals governing traffic over said track switch, means for manually clearing said signals, means causing said signals to give most restrictive indications upon operation of said means for controlling said switch machine irrespective of said means for manually clearing said signals, means requiring said signals to ive most restrictive indications before said switch machine can be controlled by said means for controlling said switch machine, and means preventing operation of said means for controlling said switch machine during the passa e of trafiic over said track switch.

n testimony whereof I afiix my signature.

FRANK L. DODGSON.

DISCLAIMER 1,824,127.Frank L. Dodgson, Rochester, N. Y. INTERLOCKING SYSTEM FOR RAIL- ROADS. Patent dated Sgptember 22, 1931. Disclaimer filed July 28, 1934. by the assignee, General azlway Signal Company.

Hereby enters this disclaimer to claims 6, 7, 8, and 15 of said Letters Patent, which are m the following words, to wit:

6. In an interlocking system for railroads, a track switch, a detector track section associated with said track switch, a switch machine for operating said track switch, a control lever, a control relay governed by said control lever over a polarized line circuit for causing said switch machine to operate, signals governing traffic over said detector track section, manually controlled means for clearing said signals, means causing said manually controlled means to be ineffective to clear said signals when said switch machine is in operation, and means preventing the operation of said switch machine during occu ancy of said detector track section.

'2'. In a railro traffic controlling system, a track switch, a switch machine for operating sa d track switch, a twoosition circuit controller for governing said switch machine, a remotely controlle relay, operating circuits for said two-position circuit controller. governed by said remotely controlled relay, holding circuits for said two-position circuit controller gpverned by said remotely controlled relay, a detector track section, means opening t e operating circuits of said two-position circuit controller when said detector track section is occupied, and means preventing o eration of said remotely controlled relay when said detector track section is occu ie "8. In a railroad traflic controlling system, a track switch, a switc machine for operating said track switch, a twoosition circuit controller for overning said switch machine, a remotely controlled re aly, operatin circuits for said two-position circuit controller governed b said remote y controlle relay, holding circuits for said twoposition circuit contro er governed by said remotely controlled relay, a detector track section, means opening the operating circuits of said two-position circuit controller when said detector track section is occupied, and means preventing the opening of said holding circuits for said two-position circuit controller when said detector track section is occupied.

15. In an interlocking system for railroads, a track switch, a switch machine for operatin said track switch, means for controlling said switch machine, signals governing trafl'ic over said track switch, means for manually clearing said signals, means causing said signals to give most restrictive indications upon operation of said means for controlling said switch machine irrespective of said means for manually clearing said signals, means requiring said si ale to give most restrictive indications before said switch machine can, be contro ed by saidmeans for controlling said switch machine, and means preventing o eration of said means for. controlling said switch machine during the passage of tra c over said track switc [Qflicial Gazette August 21. 1984.1

DISCLAIMER 1,824,127.Frank L. Dodgson, Rochester, N. Y. INTERLOCKING SYSTEM FOR RAIL- noans. Patent dated Se temher 22, 1931. Disclaimer filed July 28, 1934. by the assignee, General l ailway Signal Company. Hereby enters this disclaimer to claims 6, 7, 8, and 15 of said Letters Patent, which are in the following words, to wit:

6. In an interlocking system for railroads, a track switch, a detector track section associated with said track switch, a switch machine for operating said track switch, a control lever, a control relay governed by said control lever over a polarized line circuit for causing said switch machine to operate, signals governing traffic over said detector track sectioii, manually controlled means for clearing said signals, means causing said manually controlled means to be ineffective to clear said signals when said switch machine is in operation, and means preventing the operation of said switch machine during occu ancy of said detector track section.

7. In a railro traflic controlling system, a track switch, a switch machine for operating said track switch, a twoosition circuit controller for governing said switch machine, a remotely controlled relay, operating circuits for said two-position circuit controller. governed by said remotely controlled relay, holding circuits for said two-position circuit controller overned by said remotely controlled relay, a detector track section, means opening 510 operating circuits of said two-position circuit controller when said detector track section is occupied, and means preventing o eration of said remotely controlled relay when said detector track section is occu ie 8. In a railroad traffic controlling system, a track switch, a switc machine for operating said track switch, a twoosition circuit controller for overning said switch machine, a remotely controlled re a operatin circuits for said two-position circuit controller governed b said remote] controlle relay, holding circuits -for said twoposition circuit contr her governed by said remotely controlled relay, a detector track section, means opening the operating circuits of said two-position circuit controller when said detector track section is occupied, and means preventing the opening of said mg tr 0 over said track switch, means for manually clearing said signals, means causing said signals to give most restnctive indications upon operation of said means for controlling said switch machinejrrespective of said means for manually clearing said signals, means requiring said BIfiHBlB to give most restrictive indications before said switch machine can be contro ed by said-means for controlling sa d sw tch machine, and means preventing o eration of said means for. controlling said switch machine during the passage of tr 0 over said track switch."

[Qflicial Gazette August 21. 19311.1

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