US2162927A - Switch control and indication system - Google Patents

Description

June 20, 1939. H. s. YOUNG 2,152,927

SWITCH CONTROL AND INDICATION SYSTEM Filed NOV. 26, 1958 2 Sheets-Sheet 1 I 20 L BM T7513 I cf 46' 16 20 1a aw 15- 11 19? A M 2? NM@ 2 jg 20 WV 1 I REA 24 22 T323 1 27 DM 15 s 5131 0 ""p, .120 62 E 1 l 53 '50 w 19 20 a @49 429 2 82 DM RD 64 l '64 Fig.1. B D

INVENTOR Henry S. Yazzg.

hiv M H16 ATTORNEY June 20, 1939. H. s. YOUNG SWITCH CONTROL AND INDICATION SYSTEM Filed Nov. 26, 1938 2 Sheets-Sheet 2 EMA INVENTOR S.Y0azzg.

Fig.4.

i ill 21B Patented June 20, 1939 UNITED STATES PATENT OFFICE- swrrcu CONTROL AND INDICATION SYS TEM

Application November 26, 1938, Serial No. 242,535

16 Claims.

My invention relates to a switch control and indication system, and particularly to improved means for preventing improper operation of the switch.

It has heretofore been proposed to provide switch control means incorporating a lever movable between a normal and a reverse position to effect control of the switch so that it will move to a position corresponding to that occupied by the lever. It has also been proposed to provide means such as a signal control lever associated with the switch control lever for controlling signals which control movement of trains through the track stretch in which the switch is mounted. It has been proposed heretofore to have associated with the switch control lever mechanism known as the quick switch and operative on movement of the control lever from either of its positions towards the other position to prevent return of the control lever to its initial position unless the switch completes its movement to the other position and effects 'energization of an indication magnet for such other position of the switch.

It is an object of my invention to provide a switch control system in which a stick relay performs the functions heretofore performed by the quick switch mechanism.

A further object of my invention is to provide a system of the type described in which neutral switch repeating relays are employed, the system being arranged to prevent undesired energization of either of the indication magnets in the event the energizing circuits for the switch repeating relays become crossed.

Another object of my invention is to provide an improved switch control and indication system.

Other objects of my invention and features of novelty will be apparent from the following description taken in connection with the accompanying drawings.

I shall describe one form of apparatus embodylng my invention, together with three modifications which I may employ, and shall then point out the novel features thereof in claims.

Referring to the drawings, Fig. l is a diagram illustrating one embodiment of the improved switch control and indication system provided Fig. 3 is a fragmentary diagram illustrating anothermodification which I may employ, and

'Fig. A is a fragmentary diagram illustrating a further modification of the system provided by my invention.

Referring to Fig. 1 of the drawings, the reference character W identifies a railway track switch which is movable between a normal and a reverse position by suitable power driven means. This power driven means is here shown diagrammatically as a fluid pressure motor which is controlled in the manner well-known in the art by a lock magnet valve device LMV, a normal magnet valve device NMV, and a reverse magnet valve device RMV.

The lock magnet valve device LMV, when energized, permits the supplyof fluid under pres sure to the motor, while the normal and reverse magnet valve devices NMV and RMV control the supply of fluid under pressure to the motor in such manner as to effect operation of the motor to cause movement of the switch W to the normal or reverse position.

The lock magnet valve device LMV, when deenergized, cuts off the supply of fluid under pressure to the motor and thereby prevents operation of the motor to move the switch.

The supply of current for energizing the magnet valve devices LMV, NMV and RMV is controlled by a control lever L which may form a part of an interlocking machine. The control lever L is controlled by a normal magnet NM, a reverse magnet RM, and a lock magnet DM.

The supply of current for energizing the magnets NMand RM is controlled in a manner hereinafter explained in detail by a normal indication relay N'KR, a reverse indication relay RKR, a stick relay S, and by contacts associated with the control lever L.

The lock magnet DM is energized by current supplied over a circuit which is controlledby contacts 8 and 9 which are operated by a latch, not shown, associated with the lever L, while this circuit is also controlled in the manner wellknown in the art by relays, not shown, responsive to trafiic conditions in the vicinity of the switch so that the circuit can be completed only when it is safe to effect a change in the position occupied by the switch W.

- The circuits for energizing the normal and reverse indication relays N'KR and RKR are controlled by a contact l0 which is movable in accordance with movement of the switch W. I v The control lever L is movable about an axis throughout a segment of a circle between normal and reverse points N and R, while intermediate points in the range of movement of the lever L are designated in the drawings by the letters X, B, D and Y. The positions B and D are the normal and reverse indication positions of the control lever L.

The lever L has associated therewith a plurality of contacts which are arranged so that the circuits controlled thereby are complete when and only when the lever L is at or between predetermined points in its range of movement. The contacts are shown diagrammatically in the drawings and the positions of the lever L in which the contacts are closed are indicated by the letters identifying the contacts.

The lever L has associated therewith two contacts BD which are closed when the lever L is in any position between the points B and D, or is at either of these positions. The lever L also has associated therewith a contact D which is closed when and only when the lever L is substantially at the position D, while there is a contact B which is closed when and only when the lever L is substantially at the position B.

In addition the lever L has associated therewith a contact NB which is closed when the lever L is in any position between the points N and B, or is at either of these points, while there is a contact RD which is closed when the lever L is in any position between the points R and D, or is at either of these points.

The lever L is mounted on a shaft, not shown, on which are also mounted three segments, one for each of the magnets RM, NM and DM. Each of these magnets has an armature which controls a dog which cooperates with the associated segment to limit or prevent movement of the lever L.

The segment associated with the magnet RM is arranged so that unless the magnet RM is energized the lever L cannot be moved towards the position R, farther than the position D.

Similarly, the segment associated with the magnet NM is arranged so that unless the magnet NM is energized the lever L cannot be moved towards the position N farther than the position 13.

The segment associated with the magnet RM is also arranged so that the lever L may be freely moved away from the position R even though the magnet RM is deenergized. Likewise, the segment associated with the magnet NM is arranged so that the lever L may be freely moved away from the position N even though the magnet NM is deenergized.

The segment associated with the magnet DM is arranged so that whenthe magnet DM is deenergized the lever L, if in the position N, can'- not be moved farther from this position than the position X, while if the lever L is in the position R, and the magnet DM is deenergized, the

lever L cannot be moved farther away from the position R than the position Y.

The details of the construction of the lever L and the associated contacts, segments and cooperating dogs are not a part of this invention, and these portions of this system are the same as the corresponding portions of interlocking machines now in service.

The interlocking machine of which the switch control lever L forms a part includes a signal control lever, not shown, associated with the switch control lever L and controlling the signals for governing movement of trains through the track stretch in which the switch W is located.

The signal control lever has an intermediate position in which all of the signals, not shown, associated with the switch W are at stop, while the lever is movable inone direction from this intermediate position to effect or permit clearing of selected ones of the signals associated with the switch W, as for example the signals governing movement of trains in one direction across the switch W.

Similarly the signal control lever is movable in the other direction from the intermediate position to effect or permit clearing of other ones of the signals associated with the switch W, as for example the signals governing movement of trains in the other direction across the switch W.

The switch control lever L and the signal control lever, not shown, are mechanically or otherwise interconnected in the manner well known in the art so that the signal control lever may be moved from the intermediate position only when the switch control lever is in the normal position N or the reverse position R, and so that the switch control lever L may be moved only when the signal control lever is in the intermediate position.

The switch operated contact In controls connection from terminal B of a battery l2 to the windings of the normal and reverse indication relays NKR and RKR. One terminal of the winding of each of these relays has connected thereto a branch of wire 15 leading from terminal C of battery l2. The other terminal of the winding of relay NKR is connected by wire IE to contact I8 which is engaged by switch operated contact l when and only when the switch W is in the normal position. In this position of the switch W contact l0 also engages a contact 19 to which is connected a branch of wire 20 leading from terminal B of battery [2. Accordingly in the normal position of the switch W a circuit is established to energize the winding of relay NKR, this circuit being traced from terminal B of battery I2 through wire 20, contacts I9, 10 and I 8, wire I 6, winding of relay NKR, and wire l to terminal C of battery [2.

When the switch W is in the reverse position, the contact I0 engages contacts 22 and 24. A branch of wire 20 is connected to contact 22, while contact 24 is connected by wire 25 to one terminal of the winding of relay RKR. When the switch W is in the reverse position, therefore, a circuit is establishedto energize the winding of relay RKR, this circuit being traced from terminal B of battery l2 through wire 20, contacts 22, I0 and 24, wire 25, winding of relay RKR and'wire [5 to terminal C of battery l2.

Although the switch operated contact ID has been described as being in engagement with the stationary contacts associated therewith when the switch W is in the normal or the reverse position, it is contemplated that the apparatus may be arranged so that the contact l8 will engage the associated stationary contacts only when the switch W has been moved to its normal or reverse position and the operating mechanism for the switch has been conditioned to lock the switch in such position.

The normal indication relay NKR has a movable contact 21 which when released engages a stationary contact 28 to which is connected a branch of wire 20 leading from terminal B of battery l2. The contact 21 is connected by wire 29 to movable contact 30 of reverse indication relay RKR. Contact 30 when released engages a stationary contact 3| which is connected by wire 32 to one terminal of the winding of stick relay S, the other terminal of which has connected thereto a branch of wire I5 leading from terminal C of battery l2. Contact 30 of relay RKR when picked up engages a stationary. contact 34 to which is connected wire 35 leading to a front contact 36 of stick relay S.

The normal indication relay NKR has, in addition, a movable contact 38 which when picked up engages a stationary contact 39 which is connected by a wire 40 to front contact 4| of stick relay S.

Contact 38 of relay NKR is connected by wire 42 to movable contact 44 of relay RKR, while contact 44 when released engages stationary contact 45 to which is connected a branch of wire 20 leading from terminal B of battery l2.

The contact 38 of relay NKR when released engages a stationary contact 41 to which is connected wire 48 leading to one terminal of the lock magnet valve device LMV.

The stick relay S has a movable contact 50 which when picked up engages a stationary contact 5| to which is connected a branch of wire 32 leading to one terminal of the winding of the Wire IE to terminal 0 of battery I2.

The stick relay S has, in addition, a contact which when picked up engages contact 36. Contact 55 has connected'thereto a wire 51, while lever operated contact D controls connection between wire 51 and one terminal of the winding of reverse indication magnet RM, the other terminal of which has connected thereto a branch of wire l5 leading from terminal C of battery l2.

The stick relay S also has a movable contact 58 Which when picked up engages a stationary contact 4|, while contact 58 has connected thereto a wire 68. Lever operated contact B controls connection from wire 60 to one terminal of the normal indication magnet NM, the other termiof battery l2, to wire 62 leading to one terminal valve device RMV. Similarly lever operated con- 'a branch of wire l5 leading from terminal C of of the winding of the normal magnet valve device NMV, while lever operated contact RD controls connection between wire 2|! and wire 84 leading to one terminal of the winding of'reverse magnet tact BD controls connection from wire 20 to wire 48 leading to the lock magnet valve device LMV. The other terminal of the winding of each of the magnet valve devices is constantly connected to battery l2.

The equipment is shown in Fig. l of the drawings in the position which it assumes when the switch W and the control lever L are in their "normal positions.

At this time contact l8 establishes the circuit for energizing the winding of the normal indication relay NKR, while the circuit of the winding of the reverse indication relay RKR is interrupted. As contact 21 of relay NKR is picked up, the pick-up circuit for the stick relay S is interrupted, and as contact 50 of relay S is released, the stick circuit for the relay winding is interrupted. The stick circuit is also interrupted by contact BD associated with lever L since contact ED is open when the lever L is in the normal position, thatis position N.

In addition at this time the circuit of the winding of the lock magnet valve device LMV is interrupted since contact BD controlling the circuit to wire 48 is open, and since contact 38 of relay NKR is picked up. As the lock magnet valve device LMV is deenergized, the supply of fluid under pressure to the switch motor is cut ofi and the switch, therefore, cannot be moved,

At this time, since the lever L is in the position N, contact NB is closed and a circuit is established from wire 28 to wire 62 leading to the normal magnet valve device NMV with the result that the winding. of this device is energized. However, since the lock magnet valve device LMV is deenergized at this time, energization of the normal magnet valve device NMV is without eifect, but is maintained to restore the switch to normal in event of creepage as explained later.

It is assumed at this time that the latch operated contacts 8 and 9 controlling the circuit of the winding of the lock magnet DM are open with the result that the winding of magnet DM is deenergized.

In addition, at this time the windings of the magnets NM and RM are interrupted by the lever operated contacts D and B, and also by the contacts of the stick relayS.

If at this time the operator wishes to elfect movement of the switch W from the normal to the reverse position, he may do so by moving the lever L from the normal position N to the reverse indicating position indicated at D.

As explained above, the signal control lever, not shown, and the switch control lever L are interconnected in such manner that the switch control lever can be moved to efiect movement of the switch only when the signal control lever is in its intermediate position, at which time all of the signals controlled thereby are conditioned.

to display the stop indication.

In order to effect movement of the lever, it is necessary first to close the latch contacts 8 and 9, thereby energizing the lock magnet DM. As previously explained, the circuit of the winding of the lock magnet DM is controlled not only by the latch contacts 8 and 9, but also by relays, not shown, responsive to traiiic conditions in the vicinity of the switch W so that the circuit of the winding of the lock magnet DM can only be completed if it is safe to effect movement of the switch W. Assuming that the circuit of the winding of the lock magnet DM is completed by closing of contacts 8 and 9, this winding becomes energized and the dog controlled thereby is released to permit movement of the lever L past the position X and to the reverse indicating position D, While further movement of the lever L is prevented by the dog controlled-by the armature of the reverse indication magnet RM.

0n movement of the lever L out of the zone NB, the previously traced circuit-to the normal magnet valve device NMV is interrupted, while on movement of the lever L to the zone intermediate the points B and D, the contact BD completes the circuit for energizing the lock magnet valve device LMV. On movement of the lever L to the position D, at which point further movement of the lever is restrained by the dog associated with the reverse indication magnet RM, the contact RD completes the circuit from wire 20 to wire 64 leading to the winding of the reverse magnet valve device RMV.

On energization of the reverse magnet valve' device RMV, fluid under pressure is supplied to the motor to cause the motor to move the switch W away from the normal position to the reverse position. On movement of the switch W away from the normal position, contact ID is moved out of engagement with contacts I8 and I9, there by interrupting the circuit for energizing the normal indication relay NKR with the result that the contacts of this relay become released. On release of contact 38 of relay NKR, a circuit is established to maintain the lock magnet valve device LMV energized. This circuit is traced from terminal B of battery 12 through wire 2!], contacts 45-44 of relay RKR, wire 42, contacts 38-41 of relay NKR, Wire 43, Winding of lock magnet valve device LMV and wire I 5 leading to terminal C of battery l2. The lock magnet valve device LMV, therefore, will remain energized to permit the supply of fluid under pressure to the motor as long as both of the indication relays are deenergized.

On release of contact 2'! of relay NKR, it engages contact 28 and completes the pick-up circuit for the stick relay S. This circuit is traced from terminal B of battery I! through wire 20, contacts 28-21 of relay NKR, wire 29, contacts 30'3| of relay RKR, wire 32, winding of relay S and wire IE to terminal C of battery l2.

On energization of the winding of relay S, its contacts become picked up and its contact establishes the stick circuit for the relay winding. This circuit includes wire 20 leading from terminal B of battery 12, contact BD of lever L;

wire 53, contacts 505I of relay S and wire 32 to one terminal of the relay winding. It will be seen, therefore, that on energization of the winding of relay S, a stick circuit is established to maintain the relay Winding energized as long as the lever L remains in the zone BD and contact BD remains closed. On movement of lever L outside of the zone BD, contact BD becomes opened and the stick circuit for the relay winding in interrupted.

On picking up of the contacts of the stick relay S, contact engages contact 35 to establish a circuit for energizing the winding of the reverse indication magnet RM. This circuit, however, does not become completeuntil contact 30 of relay RKR is picked up.

When the switch W reaches the reverse position, contact H] is moved into engagement with contacts 22 and 24, thereby completing the energizing circuit for the winding of relay RKR, and on energization of this winding, contact 30 of the relay is picked up and completes the circuit for energizing the winding of reverse indication magnet RM. In addition, on energization of the winding of relay'RKR, contact 44 is picked up, thereby interrupting the circuit for establishing connection from wire 28 to wire 48 leading to the lock magnet valve device LMV.

Furthermore, on picking up of contact 30 of relayRKR, the pick-up circuit of the stick relay S is interrupted, but at this time the winding of relay S remains energized by current supplied over the stick circuit established by contact 50 of the relay.

When the contacts of relay S are picked up at a time when relay RKR is energized, relay NKR is deenergized, and lever L is at position D, a. circuit is established for energizing the reverse indication magnet RM. This circuit is traced from terminal B of battery l2 through wire 20, contacts 2821 of relay NKR, wire 29, contacts 3034 of relay RKR, wire 35, contacts 36--55 of relay S; wire 51, lever operated contact D,

Winding of reverse indication magnet RM, and wire l5 to terminal C of battery l2.

On energization of the winding of reverse indication magnet RM, the dog operated by the armature of this magnet is released to permit movement of the lever L past the position D and all of the way to the position R.

On movement of the lever L away from the reverse indication position D towards the position R, contact D operated by the lever becomes opened, thereby interrupting the circuit of the winding of reverse indication magnet RM. However, before contact D is opened the lever L will have been moved far enough to prevent reengagement of the dog with the shoulder on the segment associated with the magnet RM, and hence lever L may be moved all of the way to the position R.

On movement of the lever L to the right from position D, contact BD becomes opened, thereby interrupting the stick circuit for the winding of relay S with the result that the contacts of relay S become released. At this time the pickup circuit for the winding of relay' S is interrupted since contact 30 of relay RKR is picked up, while on release of the contacts of relay S, contact 50 further interrupts the stick circuit for the relay winding with the result that subsequent reclosing of' the contact BD will not effect picking up of the stick relay contacts.

In addition, on movement of the lever L out of the zone between the positions B and D, the contact BD controlling the circuit of the lock magnet valve device LMV is opened, and the winding of the lock magnet valve is deenergized with the result that the lock magnet valve cuts off the supply of fluid under pressure to the motor for operating the switch W.

However, as the switch W has already been moved to the reverse position, fluid under pressure is no longer required by the motor for operating the switch, and deenergization of the lock magnet valve device serves to' prevent undesired movement of the switch.

After the lever L has been moved all of the way to the position R, the operator releases the latch and contacts 8 and 9 interrupt the circuit of the lock-magnet DM and the dog associated with this magnet serves to prevent undesired movement of the lever L away from the position R.

It will be seen that when the lever L is in the position R, contact RD controlling the circuit of the winding of the reverse magnet valve device RMV is closed with the result that the winding of the valve device RMV remains energized;

However, as the lock magnet valve device LMV is normally deenergized at this time, energization of the reverse magnet valve device is without effeet, but the energization is maintained for the purpose of restoring the switch to the full reverse position in event of creepage as explained later. a

When the lever L is in the'reverse position R the signal control lever, not shown, associated with the lever L maybe actuated to establish circuits to permit clearing of the proper signals and thus permit suchtrain movements across the switch W as may be carried out when the switch W is inthe reverse position.

The system operates in a manner similar to that just described if with the switch in the reverse position the operator desires to effect move ment thereof to the normal position.

As previously explained, the signal control lever and the switch control lever L are interconnected in such manner that the switch control lever can be moved to effect movement of the switch only when the signal control lever is in its intermediate position, at which time all of the signals controlled thereby are conditioned to display the stop indication.

In order to eifect movement of the switch, the operator first closes the latch contacts 8 and 9 to energize the lock magnet DM to permit movement of the lever L away from the position R. The lever L may then be moved from position R to the normal indication position B where further movement of the lever is prevented by the dog and segment associated with the normal indication magnet'NM.

On movement of the control lever L out of the zone RD, contact RD becomes opened, thereby interrupting the circuit of the reverse magnet valve device RMV. On movement of the control lever L to the zone BD, contact BD becomes closed and establishes the circuit for energizing the lock magnet valve device LMV, while on movement of the lever L to the normal indication position B, contact NB is closed and establishes the circuit for the normal magnet valve device NMV. When the lever L is in the position B, therefore, magnet valve devices NMV and LMV are both energized and fluid under pressure is supplied to the motor for the switch W to effect movement of the switch from the reverse to the normal position.

On movement of the switch W away from the reverse position, contact l8 moves out of engagement with contacts 22 and 24, thereby interrupting the circuit of the winding of relay RKR with the result that its contacts become released. At

this time contact 2'! of relay NKR is released so that on release of contact 30 of relay RKR, the pick-up circuit for the winding of relay S is complete and the contacts of relay S become picked up. On picking up of contact 50 of relay S at a time when lever L is in the zone BD, the stick circuit for the winding of relay S is established so that the contacts of relay S remain picked up after picking up of contact 21 of relay NKR.

When the switch W completes its movement to the normal position, contact 10 engages contacts l8 and [9, thereby completing the circuit for energizing the winding of relay NKR. The contacts of relayNKR, therefore, become picked up and contact 21 is opened to interrupt the pickup circuit for the stick relay S, while contact 38 of relay NKR becomes picked up to establish the circuit for energizing the normal indication magnet NM. This circuit includes wire 20, contacts 4544 of relay RKR, wire 42, contacts 38-49 of relay NKR, wire 40, contacts dl-ES of relay 5, wire 60, lever operated contact B, winding of normal indication magnet NM, and wire I5 to terminal B of battery [2.

magnet NM.

When the lever L is moved to the left from the normal indication position B, the contacts BD are opened, thereby interrupting the stick circuit of the stick relay S and also interrupting the energizing circuit for the lock magnet valve device LMV. When the lever L is moved all of the Way to the position N, the operator releases the latch and permits the latch operated contacts 8 and 9 to separate, thereby deenergizing the winding of the lock magnet DM.

As previously pointed out on movement of lever L to the normal position N, the signal control lever, not shown, associated with the lever L may be actuated to establish circuits to permit clearing of the proper signals and thus permit such train movements across the switch W as may be carried out when the switch W is in the normal position.

The control system provided by my invention is arranged so that when the switch W is in either position, if the switch should creep from that position, fluid under pressure will be supplied to the motor to return the switch to the position which it should occupy.

When theswitch W is in the normal position, the lever L is also in the normal position and con tact ND completes the circuit to the normal magnet valve device NMV. At this time, however, contact ED is open and the circuit of the lock magnet valve device LMV is interrupted with the result that no fluid under pressure is supplied to the motor.

When the switch W is in the normal position, contact 18 engages contacts l8 and it to maintain the normal indication relay NKR energized, while relay RKR is deenergized.

, If the switch W creeps from the normal posi tion, contact I0 is moved out of engagement with contacts I8 and I 9, thereby interrupting the energizing circuit for the winding of normal indication relay NKR. On release of contact 38 of relay NKR, a circuit is established to energize the lock magnet valve device LMV. This circuit is traced from wire 20 leading from terminal B of battery I2 through contacts 4544 of relay RKR,'wire 42, contacts 38-4! of relay NKR, wire 48 to one terminal of the winding of lock magnetvalve device LMV and wire I5 to terminal C of battery l2.

As magnet valve device LMV is now energized, fluid under pressure is supplied to the motor W to effect return of the switch W to the normalposition. When the switch reaches the normal position, contact l0 again engages contacts l8 and I9 and establishes the circuit for the winding of relay NKR. On energization of the winding of relay NKR, contact 38 becomes picked up and interrupts the circuit for energizing the winding of lock magnet valve device LMV with the result that this valve device operates to out 01f further supply of fluid under pressure to the motor for operating switch W.

The system operates in a similar manner if the switch W creeps from the reverse position,

When the switch W is in the reverse position,

control lever L is at position R and contact RD is closed with the result that reverse magnet valve device RMV is -energized. At this time, however, lock magnet valve device LMV is deenergized, while relay RKR is energized and relay NKR is deenergized.

When the switch W creeps from the reverse position, contact Ii no longer engages contacts 22 and 24, thereby interruptingthe circuit for energizing the winding of relay RKR with the result that contact 44 of this relay becomes released and establishes the previously tracedcircuit for energizing the lock magnet valve device LMV.

On energization of lock magnet valve device LMV at a time'when reverse magnet valve device RMV is energized, fluid under pressure is supplied to the motor for the switch W to return the switch W to the reverse position. When the switch W attains the reverse position, cont-act [0 again engages contacts 22 and 24 and relay RKR becomes energized, while its contact 44 is picked up and interrupts the circuit for energizing lock magnet valve device LMV.

The control system provided by this invention is arranged so that if the wires for energizing the normal and reverse indication relays NKR and RKR should become crossed so that both relays are energized at a time when only one should be, the normal and reverse indication magnets NM and RM cannot be energized, and

hence the control lever L cannot be moved all of the way from its normal or reverse position to the other.

This feature of the system prevents clearing of the signals controlled by the lever L, while inability of the operator to complete movement of the lever L to either its normal or reverse position will indicate to the operator that the equipment is not functioning properly,

When the switch W is being moved from the reverse to the normal position, the normal indiis in its normal position, while relay RKR should cation magnet NM should become energized to permit movement of the control lever L to the left beyond the position B. The circuit for energizing the normal indication magnet NM'is controlled by both indication relays as well as by a contact of the stick relay S, and is complete only when the contact 38 of relay NKR is picked up and contact 44 of relay RKR is released. Relay NKR. is normally energized when the switch W be deenergized at this time. When the equipment is functioning in the intended manner, therefore, the circuit of the winding of normal indication magnet NM is complete when the lever L is at position B, and the lever L may then be moved to the left from position B to position N.

If, however, on movement of the switch W to the normal position, the wires for energizing the relays NKR and RKRbecome crossed so that both of these relays are energized, or if the winding of relay RKR is improperly energized by current supplied from any other source, the circuit for energizing the winding of normal magnet NM will be interrupted since contact 44 of relay RKR is picked up.

Accordingly the winding of normal indication magnet NM cannot be energized, and the dog associated with this magnet will prevent movement of the lever L beyond the position B towards the position N. As long as relays NICR and RKR are both energized, therefore, the winding of normal indication magnet NM cannot be energized, and as long as normal indication magnet NM cannotbe energized, movement of the lever L to the normal position N cannot be completed.

' Accordingly, the signal control lever, not shown,

associated with the lever L cannot be operated to effect clearing of the signals controlled thereby, while inability of the operator to move the lever L to the normal position will indicate to him that the equipment is not functioning properly. c

The equipment operates in a similar manner to prevent movement of the control lever L to the reverse position if both the relays RKR and NKR are energized at a time when the switch W is in the reverse position. 7

Thus it will be seen that thecircuit for energizing the reverse indication magnet RM is controlled by a contact of the reverse indication relay RKR and also by a contact of the normal indication relay NKR.

When the equipment is functioning as intended on movement of the switch W to the reverse position, the relay RKR becomes energized and its contact 30 will be picked up, while relay NKR is deenergized and its contact 2'! is released. Under these conditions a circuit is established to permit energization of the winding of reverse indication magnet RM when the stick relay S is energized and the lever L is at position D.

On energization of reverse indication magnet RM, the dog controlled thereby is released and the lever L may be moved from position D to position R.

If, however, on movement of the switch W to the reverse position relay NKR as well as relay RKR is energized due to a cross between the wires leading to the windings of these relays, or if relay NKR is energized from any other source, the circuit for the winding of reverse.

indication magnet RM cannot be completed and this magnet will remain deenergized. This will be true since contact 21 of relay NKR will be picked up, thus interrupting the circuit of the reverse indication magnet RM.

Accordingly since the Winding of reverse indication magnet RM cannot be energized, this magnet will prevent movement of the control lever L to the right beyond position D, and the operator will be unable to complete movement of the lever L to the position R.

The system provided by this invention is also arranged so that if for any reason, such as a crossed wire leading to the Winding of one of the indication relays, one or both of the indication relays NKR and RKR failsto become deenergized during movement of the switch W from one of its positions to the other, the normal and reverse indication magnets NM and RM cannot be energized, and hence movement of the lever L to either of its positions N or R cannot be completed.

When the switch W is moved away from either the normal or the reverse position, contact In is moved out of engagement with the stationary contacts associated therewith and the circuits for energizing both indication relays are interrupted until the switch W completes its movement to the other of its positions. During movc ment of the switch W between its two positions, therefore, both of the indication relays NKR and RKR should be deenergized.

When the indication relays NKR and RKR are both deenergized, the pick-up circuit for the stick relay S is established, while on movement of the lever L to the region between positions B and D, contact ED is closed, thereby completing the stick circuit for the relay S with the result that when the contacts of relay S become picked up they remain picked up.

On picking up of the contacts of relay S, contact 55 is closed to permit the circuit of the winding of reverse indication magnet RM to be completed, while contact 58 is closed to permit the circuit of the winding of normal indication magnet NM to be completed.

If the equipment does not function in the intended manner, however, and if both of the indication relays NKR and RKR do not become deenergized during movement of the switch W between its two positions, the stick relay S will not become energized and its contacts will not become closed. 75-

Thus it will be seen that if either'relay NKR or relay RKR remains energized, the pick-up circuit for relay S is not established and the contact 59 of this relay remains released with the result that the stick circuit for the relay winding cannot be established even though contact ED is closed.

Accordingly, ,under such circumstances, the contacts and 58 of the relay S remain open and the windings of the reverse indication magnet RM and of the normal indication magnet NM cannot be energized, and hence these magnets operate to restrict movement of the lever L and prevent it being moved either to the position N or to the position R. As previously stated, this inability of the operator to complete movement of the switch control lever. L indicates to him that the system is not functioning in the intended manner, while since the lever L cannot be moved to its normal or reverse position the signal control lever cannot be moved out of its intermediate position. i

From the foregoing, it will be seen that the stick relay S performs the function of the quick switch, that is, on movement of the lever L from either the normal or the reverse position, the relay S requires operation of the switch in response to this lever movement before movement of the lever to the other position can be completed, or before the lever can be returned to its initial position. Thus it will be seenthat the stick relay S is normally deenergized and becomes energized only when the contacts of both indication relays are released. The contacts of both indication relays are released only when the switch W is in transit between its two positions, and, accordingly, in order. for the relay. S to become energized the switch W must move away from either the normal or the reverse position to an intermediate position.

If for any reason on movement of the lever L away from. eitherof its positions to effect movement of the switch W to theother of its positions the switch fails to move, the relays NKR and RKR will not both be deenergized and the relay S will not become energized. As relay S does not become energized under these circumstances, its

contacts 55 and 58 remain released and interrupt the lcircuits of the windings of the normal and reverse indication magnets NM and RM so that neither of these magnets can be energized.

Unless one of these magnets is energized, the lever L cannot be moved out of the zone between the points B and D. Hence on movement of the lever L to this zone, the lever cannot thereafter .be returned to the position from which it was 'moved, nor can it complete its movement to the other position unless the switch W moves in response to movement of the lever L and effects deenergization of both of the indication relays.

Since operation of the switch W must follow movement of the lever L to prevent locking of lever L in an intermediate zone, and since the indication-magnets can only be energized in the event such movement of the switch does occur, the system insures that. when an indication is received, that is, when one of the indication magnets is energized and permits movement of the control lever out of the intermediate zone to either its normal or reverse position, that there is correspondence between the position occupied by the switch and the position of the control lever.

In Fig. 2 of the drawings, I have shown a modification of the system shown in Fig. 1 which I may employ and which provides further protection against improper operation ofthe system bypreventing energization of the lock magnet DM, and, therefore, preventing movement of the control lever L away from either its normal or reverse position unless the positions of the control lever and of the switch are in agreement.

The system shown in Fig. 2 of the drawings is the same as that shown in Fig. l of the drawings except as hereinafter explained in detail.

Referring to Fig. 2 of the drawings, it will be seen that the circuit of the winding of the lock magnet DM is controlled not only by the latch contacts 8 and 9 but also by the contacts NX and RY associated with the lever L, and by contacts of the indication relays NKR and RKR.

One terminal of the winding of the lock magnet DM is connected to wire 21 by a circuit controlled by latch contacts 8 and 9, while the other terminal of the winding ofthe lock magnet DM is connected by a wire 10 to lever controlled contacts NX and RY.

The contact NX is controlled by the lever L in such a manner that the contact is closed when and only when the lever L is in a zone intermediate the positions N and X or is at either of these positions, while contact RY is controlled by the lever L in such a manner that it is closed when and only when the lever L is in a zone intermediate the positions R and Y or is at either of these positions.

The contact NX is connected by a wire ll with a front contact 72 of relay NKR, while contact RY is connected by a wire 14 with front contact '15 of relay RKR. Relay RKR has a movable contact 16 which is connected by a wire 1! to movable contact 19 of relay NKR.

Contact'lfi of relay RKR is adapted when released to engage a stationary contact 80 to which is connected a branch of wire 8|, while contact 19 of relay NKR is adapted when released to en-' gage a stationary contact 83 to which is connected another branch of wire 8|.

Wire 8| is connected to one terminal of a suitable source of current, such asthe battery l2 in Thei circuit of the wire 8! may be controlled by means the system shown in Fig.1 of the drawings.

well known in the art, such as lock relays, not

shown, responsive to trafiic conditions in the vi-- is picked up and engages stationary contact 12, while when relay RKR is deenergized, its contact F6 is released and engages stationary contact 80 to which is connected wire 8| leading from one terminal of the source of current. A circuit,

therefore, is established between wire BI and wire 1 ll], this circuit including contacts 80-46 of relay RKR, wire 11, contacts 19'I2'of relay NKR, wire H, lever controlled contact NX and wire 10 lead- I ing to the winding of the lock magnet DM.

When the switch W is in the normal position BOZ ing the latch contacts 8 and 9, providing that the contacts of the lock relays, not shown, in the circuit of the wire 8| are closed. On energization of the lock magnet DM, the dog controlled by the armature of this magnet is released to permit movement of the lever L away from the position N, and when the lever L is moved beyond the position X, the contact NX is opened, thereby interrupting the circuit for energizing the winding of the lock magnet. However, before the winding becomes deenergized lever L will have been moved far enough so that the segment. and dog associated with the lock magnet DM will not interfere with further movement of the lever L.

In like manner, when the switch W is in the reverse position, the contacts of the normal and reverse indication relays establish a circuit to permit energization of the winding of the lock magnet DM providing the control lever L is in the reverse position.

When the switch W is in the reverse position, relay RKR is normally energized and relay NKR is deenergized. Accordingly contact 19 of relay NKR is released and engages contact 83, while contact 16 of relay RKR is picked up and engages contact 15. If at this time the control lever L is in the reverse position, contact RY is closed and a circuit is established from wire 8| to wire 10, this circuit being traced from wire 8| through contacts 83-19 of relay NKR, wire Tl, contacts 16-15 of relay RKR, wire 14, contact RY and wire 10.

v If at this time it is desired to effect movement of the control lever L away from position R the latch contacts 8 and 9 are closed, and if the contacts of the locking relays, not shown, are closed, the winding of lock magnet DM will be energized and the control lever L may be moved away from the position R. On movement of the control lever L beyond the position Y, contact RY becomes open, but before this occurs the lever will have been moved far enough so that the dog and segment associated with the lock magnet DM will not interfere with further movement i; of the lever.

From the foregoing it is clear that the modification shown in Fig. 2 of the drawings operates in such manner that if the normal and reverse indication relays NKR and RKR are energized in the proper manner, the lock magnet DM may be energized to permit movement of the control lever away from either its normal or reverse position.

This system also operates so that if for any L reason the indication relays NKR and RKR are not properly energized, the lock magnet DM cannot be energized, and hence the control lever L cannot be moved away from either its normal or reverse position.

Thus it will be seen that the circuit of the Winding of the lock magnet DM is controlled by contacts of both of the indication relays, and also by contacts controlled by the lever, and the circuits are arranged so that the circuit of the lock magnet winding is complete when and only when there is correspondence between the position of the control lever and the switch, and when the indication relays are properly energized.

If for any reason both of the indication relays NKR and RKR should be deenergized or both should be energized, no connection would be established between wire 8! and wire 1!]. Hence the winding of lock magnet DM could not be energized and the lock magnet would not permit movement of the control lever L away from either the normal or the reverse position.

Similarly, if one of the indication relays is energized'and the other is deenergized, a circuit will be established from the wire 8| to one of the wires II or 14. However, if at this time the positions of the control lever and the switch are not in correspondence so that the contact NX is closed at a time when relay NKR is released and relay RKR is picked up, or if contact RY is closed at a time when relay RKR is deenergized and relay NKR is energized, no circuit can be established to energize the winding of the lock magnet DM.

From the foregoing it is clear that unless the equipment is operating in the intended manner, the winding of the lock magnet DM cannot be energized and movement of the control lever will be prevented.

In Fig. 3 of the drawings there is shown a modification in which the indication magnets NM and RMA perform the functions performed by the lock magnet DM in the systems shown in Figs. 1 and 2 of the drawings.

With the modification shown in Fig. 3 of the drawings somewhat differently shaped segments are employed with the indication magnets than are employed in the system shown in Fig, 1. In the system shown in Fig. 3 the segment associated with the normal indication magnet NMA is arranged so that movement of the lever L to the position N and also away from this position is prevented unless the magnet winding is energized.

Similarly in the system shown in Fig. 3 the segment associated with reverse indication magnet RMA is arranged so that movement of the lever L to the reverse position R and also away from that position is prevented unless the winding of the magnet is energized.

The system shown in Fig. 3, is the same as that shown in Fig. 1 except as hereinafter explained in detail.

In the system shown in Fig. 3 of the drawings, as in the system shown in Fig. 1, circuits controlled by the stick relay S and by contacts B and D associated with the control lever L are provided for energizing the normal and reverse indication magnets to permit movement of the lever to the normal or to the reverse position.

The system shown in Fig. 3 of the drawings includes, in addition, circuits controlled by the normal and reverse indication relays, the latch controlled contacts and the lever controlled contacts as well as by contacts of the locking relays, not shown, for energizing the indication magnets to permit movement of the lever L away from either the normal or the reverse positions.

The circuits including the wires 51a. andGOa for energizing the reverse magnet RMA and normal magnet NMA, are the same as described in detail in connection with the system shown in Fig. 1 of the drawings, and the description of the operation of this portion of the system shown in Fig. 3 need not be repeated.

The circuits shown in Fig. 3 of the drawings are similar to those shown in Fig. 2 and operate so that neither of the indication magnets can be energized unless the positions of the control lever L and the switch W are in correspondence, and unless the indication relays are functioning in the intended manner.

When the switch W is in the normal position, relay NKR should be energized and relay RKR should be deenergized. Under these circumstances, assuming that the contacts of the route or locking relays, not shown, controlling the circuit of wire Blw are closed, and that the lever L is in the normal position N so that contact NX is closed, a circuit for energizing the normal indication magnet NMA is established by closing the latch contacts 8a and 9a. This circuit is traced from wire Bla, leading from one terminal of a source of current, through contacts 80a16a of relay RKR, Wire 1101., contacts 19a12a of relay NKR, wire I la, latch contacts 9a8a, lever controlled contact NX, winding of normal indication magnet NMA and wire IE to the other terminal of the source of current.

On energization of the winding NMA, the armature of this magnet is operated to release the dog controlled thereby so that the lever L may be moved away from the normal position.

When the lever L is moved beyond the position X, the contact NX becomes open, thereby interrupting the circuit of the winding of the magnet NMA, but before this winding is deenergized the lever will have been moved far enough so that the dog and segment associated with the magnet NMA will not prevent further movement of the lever L towards the reverse position.

On movement of the lever L to the position D, a circuit is established to energizethe winding of the reverse magnet RMA, this circuit being controlled by a contact of the stick relay S and being complete only if the contacts of the stick relay are picked up.

If on movement of the control lever L to the position D the winding of reverse indication magnet RMA becomes energized, the lever may be moved all of the way to the reverse position.

When the lever L is moved beyond the position D, contact BD interrupts the stick circuit of the stick relay S (see Fig. 1) with the result that the.

contacts of this relay become released and interrupt the energizing circuit of the reverse indication magnet RMA.

However, before the contact ED is opened to effect deenergization of the reverse indication magnet RMA the lever L will have been moved far enough towards the position R so that further movement of the lever in this direction is not prevented by the reverse indication magnet and its associated segment and dog.

The system operates in a similar manner when the lever L is being moved from the reverse posiition R to the normal position N.

In order to effect movement of the lever'L away from the reverse position R it is necessary first to effect energization of the reverse indication magnet RMA. This can be accomplished if the reverse indication relay RKR is energized and the normal indication relay NKR is deenergized as they should be when the switch W is in the reverse position. Under these circumstances, providing the contacts of the locking relays, not shown, are closed, on closing of the latch contacts 8b and 9ba circuit is established for energizing the winding of the reverse indication magnet RMA, this circuit being traced from wire 8| (1 through contacts 83a 19a of relay NKR, wire 1.1a, contacts 15a15a of relay RKR, wire 14a, contacts lib-8b, lever controlled contact RY, and winding of reverse indication magnet RMA to wire l5.

On energization of the winding of the magnet RMA, the lever L may be moved away from the position R into the zone DB, and on movement of the lever to this Zone, contact RY becomes opened,

thereby interrupting the circuit of the winding of the magnet RMA. However, before this occurs the lever will have been moved far enough so that further movement of the lever is not restricted by the magnet RMA.

On movement of the lever L to the position B,

contact NB is closed (see Fig. 1), and the normal magnet valve device NMV is energized to effect the supply of fluid under pressure to the motor for operating the switch W to eifect movement of the switch to the normal position.

On movement of the switch W toan intermediate position, the pick-up circuit for the stick relay S (see Fig. 1) is established, and on picking up of the contacts of relay S while the lever L is at position B the stick circuit for the winding of relay S is established. In addition, on picking up of the contacts of relay S at a time when the lever L is at position B, the circuit for energizing the winding of the normal indication magnet NMA is complete and on energization of the winding of this magnet, its armature moves the dog associated therewith so that the lever L may be moved all of the way to the normal position N.

On movement of the lever L to the position N, contact ED is opened (see Fig. 1), thereby interrupting the stick circuit for the winding of relay S and effecting deenergization of the winding of normal indication magnet NMA.

In the system shown in Fig. 3 the circuit for energizing either of the indication magnets can only be established if there is agreement between the position of the switch W and the position of the lever L, and if the indication relays are functioning properly.

Thus, when the lever L is in the normal position, at which time contact NX is closed and contact RY is open, a circuit forenergizing the normal indication magnet NMA can be established if and only if the normal indication relay NKR is energized and the reverse indication relay RKR is deenergized.

If for any reason both indication relays NKR and RKR are energized or both are deenergized, or if when the lever L is in the normal position relay RKR is energized and relay NKR is deenergized, the circuit of the winding of the normal indication magnet NMA cannot be completed, and. this magnet will prevent movement of the lever L away from the normal position.

Similarly, if when the lever L is in the reverse position, at which time contact RY is closed and contact NX is open, a circuit for energizing the reverse indication magnet RMA can be established if and only if the reverse indication relay RKR is energized and the normal indication relay NKR is deenergized.

If for any reason both indication relays NKR and RKR are energized or both are deenergized, or if when the lever is in the reverse position relay NKR is energized and relay RKR is deenergized, the circuit of the winding of the reverse indication magnet RMA cannot be completed and this magnet will prevent movement of lever L away from the reverse'position.

From the foregoing it is clear, therefore, that the modification shown in Fig. 3 of the drawings is arranged so that preliminary agreement is required between the position of the switch 'W and the control lever L or movement of the lever L away from either its normal or reverse position is prevented. 7

Furthermore, the modification shown in Fig. 3

of the drawings requires proper operation of the indication relays NKR and RKR before the lever L may be moved from either the normal or the reverse position.

In Fig. 4 of the drawings there is shown a modification similar to that shown in Fig. 3 in that the normal and reverse indication magnets NMB and RMB perform the functions performed by the lock magnet DM in the system shown in Fig. 1 of the drawings. The system shown in Fig. 4 of the drawings employs segments associated with the indication magnets RMB and NMB of the same type employed in the system shown in Fig. 3 of the drawings.

The modification shown in Fig. 4 differs from that shown in Fig. '3, however, in that the system shown in'Fig, '4does not incorporate the preliminary agreement feature of the system shown in Fig. 3, that is,-themodification shown in Fig. 4 does not require agreement between the position of the lever L and of the switch W to permit energization of the indication magnets and thus permit movement of the lever L away from either the normal or the reverse position.

The system shown in Fig. 4 of the drawings is the same as that shown in Fig. 1 of the drawings except as hereinafter explained in detail.

The system shown in Fig. 4 of the drawings includes circuits controlled by contacts B and D associated with the lever L for energizing the normal and reverse indication magnets NMB and RMB. These circuits are similar to the corresponding circuits of the system shown inFig. 1 of'the drawings and may be established'when the contacts of the stick relay S are picked up. These circuits provide means to energize the-indication magnets to permit movement of the lever L from an intermediate position to the'normal or reverse position.

The system shown in Fig. 4 of the drawings includes, in addition, circuits controlled by con-' tacts associated with the lever'L and by the latch contacts as well as by contacts of the looking or route relays, not shown, for energizing the indication magnets. These circuits provide means for energizing the indication magnets to permit movement of the lever L away from either-the normalor the reverse position.

Referring to thedrawings, it will be seen that the modification shownin Fig. 4 has a wire- 83b leading from one terminal of a source of current. The circuit of this wire is controlled by contacts of route or looking relays, not shown, so that the circuit of the wire can be completed only when it is safe to efiect movement of the switch W between its positions. The circuit is also controlled by the latch contacts 8c and' 9c, while connection from wire Blb to one terminal of the winding of the normal indication magnet NMB is controlled by a contact NX associated with the lever L. In addition, connection from latch contact 80 to one terminal of the winding of the reverse indication magnet RlVlIB is controlled by contact RY associated with the lever L.

When the leverL is in the normal position, contact NX is closed, and if the latch contacts 80 and 9c are now closed, a circuit will be established to energize the normal indication magnet NMB, providing the contacts of the route and locking relays, not shown, are picked up. On this energizationof the normal indication magnet NMB, the magnet operates to permit movement of the lever L away from the normal position.

When the lever L has been moved away from the normal position beyond point X, contact NX becomes open, but by this time the lever will have been moved'far enough so that its further movement will not be interfered with by the normal indication magnet NMB.

When the lever L'is in the reverse position, contact RY is'closed so that on closing of the latch contacts 80 and 90, a circuit is established to energize the winding of reverse indication magnet RMB, provided the contacts of the looking or route-relays, not shown, controlling the wire 8| b are picked up.

On energization of the reverse indication magnet RMB, the lever L'may be moved away from the reverse position R, whileon movement of the lever beyond the-position Y, contact RY becomes open to interrupt the circuit of the winding of the reverse indication magnet. However, before this circuit is interrupted-the leverwill have been moved far enough so that further movement of .the lever will not beinterfered with by the reverse indication magnet.

It will be seen that in the system shown in Fig, 4 of the drawings if thecontacts of the locking or route relays associated with wire 8lb are open, neitherof the indication magnets can be energized and hence the lever L cannot be moved away from either its normal or reverse po sition.

In this system, therefore, the indication magnets performthefunction performed by the lock .magnet DM employed in the system shown in Fig.1 .of the'drawings.

Although I have herein shown and described one embodiment of the improved'switch control and indication system provided by my invention, together with three modifications thereof which I-may employ, it should be understood that the invention isnot limited to these details of constructiom-and that numerous'changes and modifications maybe. made therein within the scope of the-appended claims-without departing from the spirit and scopeof my invention.

Having thus described myinvention, what I claim is:

1. In combination, a railway track switch, a motor "for moving said switch between a normal and a reverse position, a normal and a'reverse indication relay, a lever-movable between a normaland .areverse position, said lever also having a'normal indication position in which it 'efiects operation of the motor to move the switch to the normal position and having a reverse'indication position in which it effects'operation of 'the'mo tor to move the switch'to the reverse position, a member I movable in "accordance with movement of the-switch, said member being operable when and only when the switch is'in the'normal position to establish a circuit for energizing the normal indication relay and being operable when and only when the switch is in the reverse position-to establish a circuit for energizing the reverse'indication relay, a stick relay, a pick-up circuit for said stick relay which is complete when and only'when' both of the indication relays are deenergized, a stick circuit for said stick relay, said stick circuit'being established on picking up of the contacts of the stick relay, a normal indicationmagnet operable when 'deenergized'to prevent movement of the lever to the normal position, said magnet being operable when energized to permit such lever movement, and circuitscontrolled bythe lever, .by contacts of the stick relay, and by contacts of the indication relays for energizing said indication magnets.

2. In combination, a railway track switch, a motor for moving said switch between a normal and a reverse position, a normal and a reverse indication relay, a lever movable between a normal and a reverse position, said lever also having a normal indication position in which it effects operation of the motor to move the switch to the normal position and having a reverse indication position in which it effects operation of the motor to move the switch to the reverse position, a member'movable in accordance with movement of the switch, said member being operable when and only when the switch is in the normal position to establish a circuit for energizing the nor mal indication relay and. being operable when and only when the switch is in the reverse position to establish a circuit for energizing the reverse indication relay, a stick relay, a pick-up circuit for said stick relay which is complete when and only when both of the indication relays are deenergized, a stick circuit for said stick relay, said stick circuit being established on picking up of the contacts of the stick relay, said 1ever being operable on movement to either its normal or reverse position to interrupt said stick circuit, a normal indication magnet operable when deenergized to prevent movementof, the lever to the normal position, said magnet being operable when energized to permit such lever movement, a reverse indication magnet operable when deenergized to prevent movement of the lever to the reverse position, said magnet being operable when energized to permit such lever movement, and circuits controlled by the lever, by contactsof the stick relay, and by contacts of the indication relays for energizing said indication magnets.

3. In combination, a railway track switch, a motor for moving said switch between a normal and a reverse position, a normal and a reverse indication relay, a lever movable between anormal and a reverse position, said lever also having a normal indication position in which it eiTects operation of the motor to move the switch to the normal position and having a reverse indication position in which it effects operation of the motor to move the switch to the reverse position, a member movable in accordance with movement of the switch, said member being operable when and only when the switch is in the normal position to establish a circuit for energizing the normal indication relay and being operable when and only when the switch is in the reverse position to establish a circuit for energizing the reverse indication relay, a stickrelay, a pick-up circuit for said stick relay which is complete when and only when both of the indication re lays are deenergized, a stick circuit for said stick relay, said stick circuit being established on picking up of the contacts of the stick relays, a normal indication magnet operable when deener gized to prevent movement of the lever to the normal position, said magnet being operable when energized to permit such lever movement, a reverse indication magnet operable when deenergized to prevent movement of the lever to the reverse position, said magnet being operable when energized to permit such lever movement, a circuit controlled by said lever for energizing the normal indication magnet, said circuit being complete only when the normal indication relay and the stick relay are energized and the reverse indication relay is deenergized, and a circuit controlled by said lever for energizing the reverse indication magnet, said circuit being complete only when the reverse indication relay and the stick relay are energized and the normal indication relay is deenergized.

4. In combination, a railway track switch, a motor for moving said switch between a normal and a reverse position, a normal and a reverse indication relay, a lever movable between a normal and a reverse position, said lever also having a normal indication position in which it effects operation of. the motor to move the switch to the normal position and having a reverse indication position in which it effects operation of the motor to move the switch to the reverse position, a member movable in accordance with movement of the switch, said member being operable when and only when the switch is in the normal position to establish a circuit for energizing the normal indication relay and being operable when and only when the switch is in the reverse position to establish a circuit for energizing the reverse indication relay, a stick relay, a pick-up circuit for said stick relay which is complete when and only when both of the indication relays are deenergized, a stick circuit for said stick relay, said stick circuit being established on picking up of the contacts of the stick relay; said lever being operable on movement to either its normal or its reverse position to interrupt said stick circuit, a normal indication magnet operable when deenergized to prevent movement of the lever to the normal position, said magnet be ing operable when energized to permit such lever movement, a reverse indication magnet operable when deenergized to prevent movement of the lever to the reverse position, said magnet being operable when energized to permit such lever movement, a circuit controlled by said lever for energizing the normal indication magnet, said circuit being complete only when the normal indication relay and the stick relay are energized and the reverse indication relay is deenergized, and a circuit controlled by said lever for energizing the reverse indication magnet, said circuit being complete only when the reverse indication relay and the stick relay are energized and the normal indication relay is deenergized.

5. In combination, a railway track switch, a motor for moving said switch between a normal and a reverse position, a normal and a reverse indication relay, a control lever movable between a normal and a reverse position, said lever also having a normal indication position in which it effects operation of the motor to move the switch to the normal position and having a reverse'indication position in which it effects operation of the motor to move the switch to the reverse position, a member movable in accordance with move-- ment of the switch, said member being operable when and only when the switch is in the normal position to establish a circuit to energize the norand only when the switch is in the reverse position to establish a circuit to energize the reverse indication relay, a stick relay, means operable only during movement of the switch between its two positions'for establishing a pick-up circuit for said stick relay, said stick relay being operable when energized to establish a stick circuit for energizing its own winding, a normal indication magnet operable when deenergized to prevent movement of the lever to the normal position, said magnet being operable when energized to permit such lever movement, a reverse indication magmal indication relay and being operable when net operable when deenergized to prevent movement of the lever to the reverse position, said magnet being operable when energized to permit such lever movement, and circuits controlled by contacts of the stick relay, by contacts of the indication relays, and by contacts associated with the lever for energizing said indication magnets.

6. In combination, a railway track switch, a motor for moving said switch between a normal and a reverse position, a normal and a reverse indication relay, a control lever movable between a normal and a reverse position, said lever also having a normal indication position in which it effects operation of the motor to move the switch to the normal position and having a reverse indication position in which it effects operation of the motor to move the switch to the reverse position, a member movable in accordance with movement of the switch, said member being operable when and only when the switch is in the normal position to establish a circuit to energize the normal indication relay and being operable when and only when the switch is in the reverse position to establish a circuit to energize the reverse indication relay, a stick relay, means operable onlyduring movement of the switch between its twp posi tions for establishing a pick-up circuit for said stick relay, said stick relay being operable when energized to establish a stick circuit for energizing its own winding, said lever being operable on movement to either its normal or reverse position to interrupt said stick circuit, a normal indication magnet operable when deenergized to prevent movement of the lever to the normal position, said magnet being operable when energized to permit such lever movement, a reverse indication magnet operable when deenergized to prevent movement of the lever to the reverse position, said magnet being operable when energized to permit such lever movement, and circuits controlled by contacts of the stick relay, by contacts of the indication relays, and by contacts associated with the lever for energizing said indication magnets.

7. In combination, a railway track switch, a motor for moving said switch between a normal and a reverse position, a normal and a reverse indication relay, a lever movable between a normal and a reverse position, said lever also having a normal indication position in which it efiects operation of the motor to move the switch to the normal position and having a reverse indication position in which it efiects operation of the motor to move the switch to the reverse-position, a member movable in accordance with movement of the switch. said member being operable when and only when the switch is in the normal position to establish a circuitfor energizing the normal indication relay and being operable when and only when the switch is in the reverse position to establish a circuit for energizing the reverse indication relay, a stick relay, a pick-up circuit for said stick relay which is complete when and only when both of the indication relays are deenergized, a stick circuit for said stick relay, said stick circuit being established on picking up of the contacts of the stick relay, a normal indication magnet operable when deenergized to prevent movement of the lever to the normal position, said magnet being operable when energized to permit such lever movement, a reverse indication magnet operable when deenergized to prevent movement of the lever to the reverse position, said magnet being operable when energized to permit such lever movement, circuits controlled by the lever, by contacts of the stick relay, and

by contacts of the indication relays for energizing said indication magnets, a lock magnet operable when deenergized to prevent movement of the lever away from either its normal or reverse position to either of its indication positions, said lock magnet being operable when energized to permit such lever movement, and a circuit controlled by the lever and also by the indication relays for energizing said lock magnet.

8. In combination, a railway track switch, a motor for moving said switch between a normal and a reverse position, a normal and a reverse indication relay, a lever movable between a normal and a reverse position, said lever also having a normal indication position in which it effects operation of the motor to move the switch to the normal position and having a reverse indication position in which it effects operation of the motor to move the switch to the reverse position, a member movable in accordance with movement of the switch, said member being operable when and only when the switch is in the normal position to establish a circuit for energizing the normal indication relay and being operable when and only when the switch is in the reverse position to establish a circuit for energizing the reverse indication relay, a stick relay, a pick-up circuit for said stick relay which is complete when and only when both of the indication relays are deenergized, a stick circuit for said stick relay, said stick circuit being established on picking up of the contacts of the stick relay, a normal indication magnet operable when deenergized to prevent movement of the lever to the normal position, said magnet being operable when energized to permit such lever movement, a reverse indication magnet operable when deenergized to prevent movement of the lever to the reverse position, said magnet being operable when energized to permit such lever movement, circuits controlled by the lever, by contacts of the stick relay, and by contacts of the indication relays for energizing said indication magnets, a lock magnet operable when deenergized to prevent movement of the lever away from either its normal or reverse position to either of its indication positions, said magnet being operable when energized to permit such lever movement, a circuit for energizing said magnet when the lever is in the normal position, said circuit being complete only when the normal indication relay is energized and the reverse indication relay is deenergized, and a circuit for energizing said magnet when the lever is in the reverse position, said circuit being complete only when the reverse indication relay is energized and the normal indication relay is deenergized.

9. In combination, a railway track switch, a motor for moving said switch between a normal and a reverse position, a normal and a reverse indication relay, a lever movable between a normal and a reverse position, said lever also having a normal indication position in which it effects operation of the motor to move the switch to the normal position and having a reverse indication position in which it effects operation of the motor to move the switch to the reverse position, a member movable in accordance with movement of the switch, said member being operable when and only when the switch is in the normal position to establish a circuit for energizing the normal indication relay and being operable when and only when the switch is in the reverse position to establish a circuit for energizing the reverse indication relay, a stick relay, a pick-up circuit for Saidstick'relay which is complete whenand only when both of the indication relays are deener: gized, a stickqcircuit for said stick relay, said stick circuit being established on picking up of the contacts of the stick relay, a normal indication magnetoperable when denergized to prevent movement of the lever to or from the normal position, said magnet being operable when energized to permit such lever movement, a reverse indication magnet operable when deenergized to prevent movement of the lever to or from the reverse position, said magnet being operable when energized to permit such lever movement, a circuit for energizing the normal indication magnet, said circuit: beingcomplete when and only when the lever is in the normal indication position, the stick relay and'the normal indication relay are energized and the reverse indication relay is deenergized, another circuit for energizing the normal indication magnet, said other circuit being complete. only when the lever is in the normal position, the normal indication relay is energized andthe reverse indication relay is deenergized, a circuit for energizing the reverse indication magnet'jsaid circuit being completewhen and only when the lever is in the reverse indication position, the stick relay and thereverse indication relay are energized, and the normal indication relay is deenergized, and another circuit for energizing thereverse indication magnet, said circuit being complete only when the lever is in the re verse position, the reverse indication relay is energized and the normal indication relay is deenergized.

10. In combination, a railway track switch, a motor for moving said switch between a normal and a reverse position, a normal and a reverse indication relay, a lever movable between a normal and a-reverse position, said lever also having a normal indication position in which it effects operation of the motor to move the switch to the normal position and having a reverse indication position in which it effects operation of the motor to move the switch to the reverse position; a member movable in accordance with'movement of the switch, said member being operable when and only when the switch is in the normal position to establish a circuit for energizing the nor mal indication relay and being operable when and only when the switch is in the reverse position to establish a circuit for energizing the reverse indication relay, a stick relay, a pick-up circuit for said stick relay which is complete when and only when both of the indication relays are deenergized, a stick circuit for said stick relay, said stick circuit being established on picking up of the contacts of the stick relay, a normal indication. magnet operable when cleenergized to prevent movement of the lever to or from the normal position, said magnet being operable when energized to permit such lever movement, a reverse indication magnet operable when deenergized to prevent movement of thelever to or from the reverse position, said magnet being operable when energized to permit such lever movement, a circuit through which current may be supplied to energize the normal indication magnet provided the stick relay is energized and the lever is in the normal indication position, another circuit independent of the stick relay for energizing the normal indication magnet when the lever is in the normal position, a circuit through which current maybe supplied to energize the reverse indication magnet provided the stick relay is energized and the lever is in the reverse indication position, and

another circuit independent of the stick relay for energizing the reverse indication magnet when the lever: is in the reverse position.

:;l'1. ;In combination, a railway track switch, a motor for moving said switch between a normal and areverse position, a normal and a reverse indication relay, a lever movable between a normal anda reverse position, said lever alsorhav ing a normalindication position in which it efiects operation of the motor to move the switch to the normal position and having a reverse indication position in which it effects operation of the motor to move the switch to the reverse position, a member movable in accordance with movement of the switch, said member being operable when and only when the switch is in the normal position to establish a circuit for energizing the normal indication relay and being operable when and only when the switch is in the reverse position to establish a circuit for energizing the reverse indication relay, a stick relay, a pick-up circuit for said stick relay which is complete when and only whenboth of the indication relays are deenergized, a stick circuit for said stickrelay, said stick circuit being established; on picking up of the contacts of the stick relay, a normal indication magnet operable when deenergized to prevent movement of the lever to or from the normal position, said magnet being operable when energized to permit such lever movement, a reverse indication magnet operable when deenergized to prevent movement of the lever to or from-the reverse position, said magnet beingoperable when energized to permit such lever movement, a circuit through which current may be supplied to energize the normal indication magnet provided the stick relay is energized and the lever is in the normal indication position, another circuit independent of the stick relay and through 'whichcurrent may be supplied to energize the normal indication magnet when the lever is in the normal position provided the normal indication relay is energized and the reverse indication relay is deenergized, a circuit through which current may be supplied to energize the reverse indication magnet provided the stick relay is energized and the lever is in the reverse indication position, and another circuit independent of the stick relay and through which current may be supplied to energize the reverse indication magnet when the lever is in the reverse position provided the reverse indication relay is energized and. the normal indication relay is deenergized.

12. In combination, a railway track switch, a motor for moving said switch between a normal and'a reverse position, a lever movable between a normal and a reverse position, said lever also having a normal indication position in which it effects operation of the motor to move the switch to the normal position and having a reverse indication position in which it effects operation of being operable in either its normal or its reverse position to interruptsaidstick circuit, a circuit 1 for supplying current to energize the normal indication magnet, said circuitbeing complete only when the lever is-in the normal indication position and the stickrelay isenergized, means responsive to the position ofthe switch for also controlling said last-named circuit, said means being operable to-establish said circuit only when the switch is in the-normal position, a circuit for supplying current to energize the reverse indication magnet, said circuit being complete only when the lever is in the reverse indication position and the stick relay is energized, and means responsive to the position of the switch for also controlling said last-named circuit, said means being operable to establish said circuit only when the switch isin the reverse position.

13. In combination, a railway'track switch, a motor for moving said switch between a normal and a reverse position, a control lever movable between a normal and a reverse position, said control lever also having a normal indication position in which it effects operation of the motor to move the switch to the normal position and a reverse indication position in which it effects operation of the motor to move the switch tothe reverse position, a normal indication magnet operable when deenergized to prevent movement'of the control lever from the normal indication position to the normal position, said magnet being operable when energized to' permit such lever movement, a reverse indication magnet operable when deenergized to prevent movement of-the control lever from the reverse indication position to the reverse position, saidmagnet being operable when energized to permit such lever movement, a normal supply circuit for energizing the normal indication magnet and a reverse supply circuit for energizing the reverse indication magnet, a stick relay having contacts controlling said normal and reverse supply circuits, said stick relay contacts also controlling a stick circuit for energizing its own winding, said stick re' lay contacts being operable to permit said circuits to be completed whenand onlywhen the relay winding is energized, means operable when and only when the switch is in transit between its two positions to establish a pick-up circuit for the stick relay, contacts controlled by said lever for controlling said supply circuits and said stick circuit, said contacts being operable to interrupt said circuits when the lever is in either its normal or'its reverse position and being operable to permit said stick circuit to be completed when the lever is in either of its indication positions, said contacts being also operable when and only when the lever is in the normal indication position to permit the normal supply circuit to be completed and being operablewhen and only when the lever is in the reverse indication position to permit the reverse supply circuit to be completed, and means governed by the switch for also controlling said supply circuits, said means being operable to permit completion of, the normal supply circuit when and only when the switch is in the normal position and being operable to permit completion of the reverse supply circuit when and only when the switch is in the reverse position.

'14. In combination, a railway track switch, a

and a reverse position, a control lever movable between anormal and a reverse position, said control lever also having a normal indication position in which it effects operation of the 'motor to move the switch'to thenormal position and a reverse indication position in which it effects operation of the motor to move the switch to the reverse position, a normal indication magnet operable when deenergized to prevent movement of the control lever from the normal indication position to the normal position, said magnet being operable when energized to permit such lever movement, a reverse indication magnet operable when deenergized to prevent movement of the control lever from the reverse indication position to the reverse position, said magnet being operable when energized to permit such lever movement, a normal supply circuit for energizing the normal indication magnet and a reverse supply circuit for energizing the reverse indication magnet, a stick relay having contacts controlling said normal and reverse supply circuits, said stick relay contacts also controlling a stick circuit for energizing its own winding, said stick relay contacts being operable to permit said circuits to be completed when and only when the relay winding is energized, means operable when and only when the switch is in transit between its two positions to establish a pick-up circuit for the stick relay, contacts controlled by said lever for controlling said supply circuits and said stick circuit, said contacts being operable to interrupt said circuits when the lever is in either its normal or its reverse position and being operable to permit said stick circuit to be completed when the lever is in either of its indicationpositions, said contacts being also operable when and only when the lever is in the normal indication position to permit the normal supply circuit to be completed and being operable when and only when the lever is in the reverse indication position to permit the reverse supply circuit to be completed, a normal and a reverse indication relay, means governed by the switch for energizing said indication relays, said means being operable when and only when the switch is in the normal position to energize the normal indication relay and being operable when and only when the switch is in the reverse position to energize the reverse indication relay, the indication relays controlling said supply circuits in such manner that the normal supply circuit is complete only when the normal indication relay is energized and the reverse indication relay is deenergized, and so that the reverse supply circuit is complete only when the reverse indication relay is energized and the normal indication relay is deenergized.

15. In an interlocking machine, in combination, a railway track switch, a motor for moving said switch between a normal and a reverse position, a control lever movable between a normal and a reverse position, said control lever also having a normal indication position in which it efiects operation of the motor to move the switch to the normal position and a reverse indication position in which it efiects operation of the motor to move the switch to the reverse position, a normal indication magnet operable when deenergized to prevent movement of the control lever from the normal indication position to the normal 7 position, said magnet being operable when energized to permit suchlever movement, a reverse indication magnet operable when deenergized to prevent movement of the control lever from the reverse indication position to the reverse position, said magnet being operable when energized to permit such lever movement, a normal supply circuit for energizing the normal indication magnet and a reverse supply circuit for energizing the reverse indication magnet, means operable when and only when the switch is in transit between its two positions and the control lever is in either of its indication positions to establish connections to permit the supply circuits to be completed and to maintain such connections until the control lever is moved to either its normal or reverse position, contacts associated with the control lever and controlling said supply circuits, said contacts being operable when and only when the lever is in the normal indication position to permit the normal supply circuit to be completed and being operable when and only when the lever is in the reverse indication position to permit the reverse supply circuit to be completed, and means governed by the switch for also controlling said supply circuits, said means being operable to permit completion of the normal supply circuit only when the switch is in the normal position and being operable to permit completion of the reverse supply circuit only when the switch is in the reverse position.

16. In an interlocking machine, in combination, a railway track switch, a motor for moving said switch between a normal and a reverse position, a control lever movable between a normal and a reverse position, said control lever also having a normal indication position in which it effects operation of the motor to move the switch to the normal position and a reverse indication position in which it effects operation of the motor to move the switch to the reverse position, a normal indication magnet operable when deenergized to prevent movement of the control lever from the normal indication position to thenormal position, said magnet being operable when energized to permit such lever movement, a reverse indication magnet operable when deenergized to prevent movement of the control lever from the reverse indication position to the reverse position, said magnet being operable when energized to permit such lever movement, a normal supply circuit for energizing the normal indication magnet and a reverse supply circuit for energizing the reverse indication magnet, means operable when and only when the switch is in transit between its two positions and the control lever is in either of its indication positions to establish connections to permit the supply circuits to be cmpleted and to maintain such connections until the control lever is moved to either its normal or reverse position, contacts associated with the control lever and controlling said supply circuits, said contacts being operable when and only when the lever is in the normal indication position to permit the normal supply circuit to be completed and being operable when and only when the lever is in the reverse indication position to permit the reverse supply circuit to be completed, a normal and a reverse indication relay, means governed by the switch for energizing said indication relays, said means being operable when and only when the switch is in the normal position to energize the normal indication relay and being operable when and only when the switch is in the reverse position to energize the reverse indication relay, the indication relays controlling said supply circuits in such manner that the normal supply circuit is complete only when the normal indication relay is energized and the reverse indication relay is deenergized, and. so that the reverse supply circuit is complete only when the reverse indication relay is energized and the normal indication relay is deenergized.

HENRY S. YOUNG.

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