US2224420A - Switch control and indication system - Google Patents

Description

Dec. 10,

H. s. YOUNG SWITCH CONTROL AND INDICATIDN SYSTEM Filed Feb. 14, 1939 INVENTOR m H U N 0 m T y .m mmw .Jh W NN t for t wind n s c th st ck re a s to he r? Patented Dec. 10, 1940 swrron common AND INDICATION SYSTEM Henry S. Young, Wilkinsburg, 2a., assignor to The Union Switch & Signal" Compan Swissvale, Pa., a corporatipnof Pennsylvania Application reb ary 14, 1939, Serial No. 256,325

11 Claims. My invention relates tora control and; indication system for railway track switches, and particu-,

larly to an improved system employing neutral control and indication circuits.

In the interlocking machines of the, type now widely employed switch control levers are provided and each is movable between a normal and a reverse indication position to, efiect movement of a switch or switches to corresponding positions. In these machines each of the switch control levers is also movable, to a normal and a reverse position to permitmovement ofa signal control lever from an intermediate position to one position or another toeffect clearing of selected ones of the signals associated with the switch or switches.

The switch control levers are arranged so that they can be moved to one or the other of their operating positions, that is the normal or reverse position, only when the. indication magnet for that position of the lever is energized, while means is provided which is operable only. when the switch is in the corresponding one of. its positions to energize the indication magnet forthat position of the switch control lever.

It is an object of my invention to provide an improved system of the type described and incorporating means to insure against improper operation of the system in the event a cross or other faulty condition should be present in any part of the circuits of the indication magnets.

A further object of my invention is to provide an improved system of the type described which employs neutral indication circuits, and which incorporates means to insure that after movement of the switch control lever to either of its operating positions both of the indication relays must thereafter become released before the lever can be moved to the other of its operating positions or before movement of the switch controlled thereby can be effected.

Another object of my invention is to provide an improved system of the type described which employs stick relays to control the circuits of the indication magnets, and having means controlled by the switch control lever for controlling the pick-up and the stick circuits for the windings of the stick relays.

A further object of my invention is to providean improved system of the type described incorporating means independent of the switch control lever for interrupting the pick-up cirby previ e t ascerta n itbeiheterei the. stick circuits for the stick relays are, func:

tioning as intended.

Another object of the invention is to provide an improved system of the type described and incorporating means operative in a manner such 5 thaton movement of the switch control lever out ofa zone adjacent either of itsv operating, positions the. indication relay for that leverposition must become released before the lever can be. returned. to that operating position or before a change can be; effected in the, position of the switch.

A further object of the invention is to. provide an improved system of the type, described, ,the indication relays controlling the signal control circuits so, that the signals for either position of the switch can be cleared only when the conests of e indi at n r lavfor ha p s t o the swit h are picke up, w ereby if the switch creeps from either. oi its positions the signals will be caused to. display a stop indication until he w ch s re ored to i o nal pos t n- Another object of my invention is to provide an mn q d w tc on o a d in i a on Y5 tern adapted for use in controlling the switches at a rossov A i rthe b ect o m invent i t p d n imp ov d s t ont o a nd ti tem.

Other. objects of my invention and features of novelty will be apparent from the following descr ptio ta n in c ne tiqn w t e. mr Pe v ns d aw I shall describe one form of apparatus embodyin; my invention and shall then point out the novel features thereof in claims.

drawing the single figure is a diagram of an improved switch control and indication een e e eq i nv n o "lteierrin g to the drawing, the reference numerals I and {designate stretches of railway trackwhichare connected by a crossover, While movement of trains through the track stretches and over the crossoveris.controlled by switches MN and 2W which aremounted in the track stretches l and 2,respectiv'ely.

Each of these switches 'is'movable between a normal and a reverse position by means of a suitable motor, here shown" diagrammatically as a pneumatic motor, but itis contemplated that otherty pes of motors. as for example an electric motor, may b-e'mpldyed if desired.

Each of the switches is operable when in the eqr al 99 919 11; a sh w o e t u h which the switch is asthma, while when the switches are both in their reverse positions trains will pass through the crossover from one of the tracks to the other.

The switches |W and 2W have associated therewith signals, not shown, which are controlled in the manner well known in the art and which govern movement of trains across the switches.

Each switch motor has associated therewith a lock magnet valve device LMV which when energized permits the supply of fluid under pressure to the switch motor, while there is, in addition, a normal magnet valve device NMV which controls the supply of fluid from the lock magnet valve device to the switch motor to effect operation of the motor to move the switch to the normal position.

Similarly each motor has associated therewitha reverse magnet valve device RMV which when energized controls the supply of fluid under pressure from the lock magnet valve device LMV to the motor to effect operation of the motor to move the switch to the reverse position.

The reference characters for the magnet valve devices associated with the switch IW are preceded by the numeral I, while those for the devices associated with the switch 2W are preceded by the numeral 2.

The windings of the corresponding magnet valve devices associated with the two switches are connected in series, as hereinafter explained in detail, so that when the winding of a valve device associated with either switch is energized,

the winding of the corresponding valve device associated with the other switch is also energized.

A switch control lever L which forms a part of an interlocking machine is provided to control the circuits for energizing the magnet valve devices, and thereby eifect movement of the switches |W and 2W from one position to the other.

The interlocking machine of which the control lever L forms a part is of a construction well known in the art and the details of its construction, except as hereinafter pointed out in detail, are not a part of this invention. The lever L is movable between a normal position N and a reverse position R, while intermediate points in its range of movement are indicated at X, B, D

and Y. The position B is the normal indication position of the lever L, while the position D is the reverse indication position of the lever L.

The lever L has associated with it several contacts which are closed at different points in the range of movement of the lever. These contacts are identified in the drawing by the letters indicating the points in the range of movement of the lever between which the contacts are closed, while these contacts are also closed when the control lever L is at or substantially at one or the other of the points between which the contacts are closed. Where there are several contacts which are closed in the same zone of movement of the lever they are preceded by a distinguishing numeral.

' The shaft on which the lever L is mounted has secured thereon segments with which coop-' segment has associated therewith thereverseindication magnet RM which controls the dog associated with this segment. The segments are identified in the drawing by the same reference characters as are employed for the magnets with which the segments are associated.

The circuits of the windings of the indication magnets NM and RM are controlled by contacts of a normal indication relay NKR, and of a reverse indication relay RKR, as well as by contacts Ill and II which are movable in accordance with movement of the switches |W and 2W, respectively.

As hereinafter explained in detail, the contacts of the indication relays NKR and RKR also control the circuits for energizing the magnet valve devices associated with the motors for operating the switches lW and 2W.

The interlocking machine of which the switch control lever L forms a part has associated therewith a battery l2. The terminal F of the battery I2 is connected by wire l5 to one terminal of the windings of the indication relays NKR and RKR, to one terminal of the windings of the indication magnets NM and RM, and also to one terminal of the windings of the magnet valve devices ZLMV, 2NMV and 2RMV.

The terminal G of battery I2 is connected by wire I6 to contacts 2RY, 2NX, 3RY and 3NX associated with the lever L, while a branch of wire I6 is connected to back points of contact l8 and IQ of reverse indication relay RKR.

The other terminal of the winding of the reverse indication relay RKR is connected by wire 20 to a contact 2| of reverse push button RPB. Contact 2| is normally engaged by movable contact 22 which also engages a contact 23 which is connected by wire 24 to contact IRY associated with the lever L. Contact IRY is connected by wire 26 to a stationary contact 21 associated with the switch controlled contact l.

The other terminal of the winding of the normal indication relay NKR is connected by wire 28 to a contact 30 of normal push button NPB. Contact 30 is normally engaged by movable contact 3| which also engages a contact 32 which is connected by wire 33 to contact INX associated with the switch control lever L. Contact INX is connected by wire 36 to contact 31 associated with switch controlled contact The lever operated contacts 2RY and 2NX, to which are connected wire l6 leading from terminal G of battery l2, are connected by a wire 40 to contacts 4| and 42 associated with switch controlled contact I0.

When the switch 2W is in the normal position, as shown, contact I engages contact 31 and also engages contact 44 which is connected by wire 45 to contact 46 associated with switch controlled contact Ill. When the switch |W is in the normal position, as shown, contact Ill engages both contacts 42 and 46. Accordingly, when switches |W and 2W are both in their normal positions a circuit is established between wires 35 and 40, this circuit being traced from wire 36 through contacts 31, II and 44, wire 45, and contacts 46, I0 and 42 to wire 40.

When the switch 2W is in the reverse position contact engages contact 21 and also engages contact 48 which is connected by wire 49 to contact 50 associated with switch controlled contact l0.

When switch |W is in the reverse position contact l0 engages contacts 4| and 50. Accordingly, whentheswitches |W and 2W are both in their reverse positions a circuit is established between XLQQQABQ wires 26 and 40, this circuit being traced 3. 1

cuits controlled thereby when and only when of wire 26.

the switches 1W and 2W are substantially in their normal or their reverse positions, and so that the circuits controlled by the contacts lil and H are interrupted as soon as the switches move away from their normal or reverse positions.

While the contacts I and II have been described as establishing the circuits controlled thereby when the switches IW and 2W are in their normal or their reverse positions, it is contemplated that these contacts may operate in the manner well known in the art to establish the circuits controlled thereby when and only when the switches are in their normal or reverse positions and are locked in those positions.

The reverse indication relay RKR has a movable contact 52 to which is connected. a branch Contact 52 when released engages a contact 53 which is connected by wire 54 to one terminal of the winding of reverse indication magnet RM, the other terminal of which has a branch of wire l5 connected thereto. Contact 52 when picked up engages a contact 55 to which is connected a branch of wire 20 leading from one terminal of the winding of reverse indication relay RKR.

The normal indication relay NKR has a movable contact 51 to which is connected a branch of wire 35. Contact 51 when picked up engages a stationary contact 58 to which is connected a branch of wire 28 leading from one terminal of the winding of relay NKR, while contact 51 when released engages a stationary contact 59 which is connected by wire 60 to one terminal of the winding of the normal indication magnet NM.

The indication relays RKR and are slow releasing so that the contacts of these relays when picked up remain picked up for a time interval subsequent to the interruption of the supply of current to the relay winding.

The indication relays RKR and NKR. have contacts which control the circuits for supplying current to the windings of the magnet valve devices so that the windings of these devices can be energized only when both indication relays are released at times when lever L is in certain positions.

The reverse indication relay RKR has a contact 6| which when released engages contact l8 to which is connected a branch of wire l6 leading from terminal G of battery l2. Contact 6| of relay RKR is connected by wire 62 to contact 63 of relay NKR. The relay NKR has a movable contact 64 which when released engages contact 63, while contact 64 is connected by wire 65 to one terminal of the lock magnet valve device lLMV. The other terminal of the winding of this valve device is connected by wire 61 to one terminal of the winding of lock magnet valve device 2LMV, the other terminal of which is connected by wire IE to terminal F of battery l2.

It will be seen that when the contacts of both indication relays NKR. and RKR are released a circuit is established to energize the windings of the lock magnet valve devices in series.

circuit is traced from terminal G of batmy 2 thr gh ire 1.6, ccnta t lie-1 of. r lay 11KB, w re taco ac iii of r la NKE re 65. wind n i m s-net a ve device LM wi e 6 w ndin of m ne va v d c LMV, and wire 15 to termi a F at bat er 1 It wi b seen. also that circu t s inter usted; ii the contacts either indication re ay are picked 1. .1

The la .RKR else has a mov le c ntact 1 wh ch wh n rele sed eng e ccn a H o which s onn cteda branch 0i wire llix ca ine fr m ermi al G o battery 12, Co a s. conne tccl y Wi e 1| to contac 12 i relay Relay NKR has a movable contact 13 which w e re e sed e gages ccntac 12 and whi h i nccte y tc leve operate ontacts BD, B andBll.

The centact BD- al o h s connected hereto a r n o i e leading o co acts 1 and 42 associated with switch lW.

The lever operated contact NB has connected thereto wire 16 leading to one terminal of the winding of the normal magnet valve device INMV, the other of which is connected by wire l! to one terminal of the winding of magnet valve device 2NMV. The other terminal of the winding of magnet valve device ZNMV is con-.

nected by wire l5 to terminalF of battery l2.

The contact RD has connectedthereto wire 80 leading to one terminal of the winding of magnet valve device IRMV, The other terminal of the winding of this magnet valve device is connected by wire 8| to one terminal of the winding of magnet valve device ZRMV, the other terminal of which is connected by wire [5 to terminal F of battery l2 l It will beseen that when the contacts of both indication relays are released a circuit is established from wire 16 leading from terminal G of battery I2 to wire [4. This circuit is traced from wire 16 through contacts l9-.-10 of relay RKR, wire H, contacts 12-.-'l3 of relay NKR to wire 14. It will be seen also that this circuit is interrupted if the contacts of either indication relay are picked up.

When the lever L is in any position between the points N and B, or is at either of these points, a circuit is established by contact NB from wire 14 to wire 16 to energize the windings of normal magnet valve devices INMB and 2NMB in series.

Similarly, when the lever L is in any position between the points D and R, or is at either of these points, a circuit is established by contact RD from wire 14 to wire 80 to energize the windings of reverse magnet valve devices IRMV and ZRMV in series.

The lever L also has associated therewith contacts 3NX and 3RY which establish connection directly from the wire IE to the wires 16 and 80 in certain positions of the lever L to thereby effect energization of the windings of the normal and reverse magnet valve devices at times when the indication relays are not both deenergized.

Wire 16 leading from terminal G of battery 12 is connected to contacts 3NX and 3RY, while contact 3NX has a branch of wire 16 connected thereto, and contact SRY has a branch of wire 8 connected thereto.

Accordingly when lever L is in the zone NX, or is at either of the positions N or X, contact 3NX establishes a circuit from wire it to wire 15' leading to the normal magnet valve devices, while when the lever L is in the zone RY, or is at either of the positions R or Y, the contact energized. Y

This segment also has formed thereon a tooth 86 which prevents movement of the lever L The segment associated with the normal indication magnet NM has projections 01- teeth thereon which are shaped 'so that movement ofthe lever L away from the position N is permitted regardless of whether or not the winding of the magnet NM is energized or deenergized.

The segment associated with the magnet NM has a tooth 85 formed thereon which preventsmovement of the lever L towards the position N farther than apoint substantially at the position B unless the winding of magnet NM is towards the position N farther than a point substantially intermediate the points 3 and D unless the winding of magnet NM is deenergized.

In order to effect movement of the lever L from position R to position N, therefore, it is necessary to move the lever L to the position B at a time when the winding of magnet NM is deenergized,

I then effect energization of the winding of magnet NM, and thereafter complete movement of the lever L to position N.

. The segment associated the reverse indication magnet 'RM has projections or teeth ,thereon' which are shaped so that movement of the lever L away from the position R is permitted regardless of whether or not the winding of the magnet RM is energized or deenergi zed. I

The segment associated with the magnet RM has a tooth 88 formedthereon which prevents 'movement of the lever L towards the position R farther than a point substantially at theposition D unless the winding of magnet RM is energized. This segment also has formed thereon a tooth 89 which prevents movement of the lever L towards the position R farther than a point substantially intermediate the points B and D unless the winding of the magnet'RM is deenergized.

In order to effect movement of the lever L from the position N to the position R. it is necessary to move the lever L to position D at a time when the magnet RM is deenergized, then effect energization of the magnet RM, and thereafter complete movement of the lever L to position R.

- The interlocking machine of which the lever L 50 from right to left as viewed in the drawing,

Similarly, the signal control lever is movable in the other direction from the center or intermediate position to a right position in which it conditions selected ones of the signals associated "with the switches IW and 2W to permit train movements-from left to right as viewed in the drawing. I

The signal controlv lever is mechan cally or otherwise interconnected withthe switch control lever L in such a manner that the signal control lever can be moved from its center or intermediate position only when the switch control lever L is in the position N or the position R. In addition the signal and switch control levers are intercon- Jne cted in suchmanner that the position of the SRY establishes a'circuit from wire IE to wire leading to the reverse magnet valve devices.

switch control lever can be changed only when the signal control lever is in its center or intermediate position.

v The indication relays NKR and RKR have in addition, contacts which control the circuits for controlling the signals not shown, associated with the switches IW and 2W.

The normal indication relay NKR has a contact which when picked up engages a contact 9| to complete a circuit to permit clearing of those signals which it is proper to have cleared when the switches l W and 2W are in their normal positions. I

Similarly the reverse indication relay RKR has a contact 92 which when picked up engages a contact 93 to complete a circuit to permit clearing of those signals which it is proper to have clearedwhen the switches IW and 2W are in their reverse positions.

The equipment is shown in the drawing with the switch control lever L and the switches IW and 2W in their normal positions. At this time switch controlled contacts In and H establish connection between wires 36 and 40.

As the switch control lever L isin the position N, contact IRY is open and interrupts the circuit of the winding of the reverse indication relay RKR so that this relay cannot become ener-.

gized, and, therefore, the contacts of this relay are released.

As the lever L is in the position N, contacts INX and 2NX are closed and a circuit is established to energize the winding of the normal indication relay NKR with current supplied from battery I2.

This circuit is traced from terminal G of battery [2 through wire l6, contact ZNX, wire 40, switch controlled contacts I0 and I l to wire 36, contact INX, push button NPB, wire 28, winding of relay NKR, and wire l5 to terminal F of battery 12.

As the winding of relay NKR is energized, the

contacts of the relay are picked up and contact 57 engages contact 58 to establish a stick circuit from wire 36 to wire 28 shunting the contact, INX and thepush button NPB.

In addition, contact 64 of relay NKR is picked up and interruptsthe circuit from terminal G of battery I2 to wire 65 leading to the lock magnet valvedevices ILMV and ZLMV. Accordingly, at this time the windings of the lock magnet valve devices are not energized and these valve devices prevent thesupply of fluid under pressure to the motors associated withthe switches IW and 2W.

At this time the contact '13 of relay NKR is picked up and interrupts the-connection from wire l6, leading from terminal G of battery [2, to wire 14 from which connection is established by contact NB to wire 16 leading to the normal magnet valve devices. However, as the lever L is in position N, the contact 3NX establishes connection from wire I6 to the wire 16, and, accordingly, the windings of the normal magnet valve devices INMV and ZMV are energized, but as the windings of the lock magnet valve devices are not energized, no fluid is supplied to the switch motor.

If at this time either of the switches IW or 2W should creep from the normal position, the contact controlled by that switch would interrupt the circuit between the wires 40 and 36, and thereby interrupt the supply of current to the winding of the relay NKR, Accordingly, the winding of this relay willbe deenergized and the relay contacts will become released. On the release of contact 64 the circuit from the terminal G of battery l2 to wire 65 leading to the lock magnet valve devices is complete. 'I'hewindings of these valve devices become energized and fluid under pressure is supplied to the switch motors to return the switches to the normal position.

When both switches are again in the normal position, the contacts l0 and H reestablish connection between wires 40 and 36 and the winding of relay NKR is again energized. Contact-64 of relay NKR, therefore, is picked up and interrupts the circuit of the locli magnet valve devices, thereby eflecting operation of these valve devices to cut ofi the supply of fluid under pressure to the switch motors.

In addition, on the release of the contacts of a the normal indication relay NKR. contact 90 becomes disengaged'from contact 9!, thereby interrupting the signal control circuit to cause the signals associated with the switches 1W and 2W to display the stop indication.

When the switch is restored to the normal position and the contacts of the normal indication relay become picked up, contact 90' again engages contact 9| to complete the signal control circuit and thereby cause the signals to again display the clear indication.

It will be seen, therefore, that if one of the switches creeps from the normal position, the signals associated with the switches will be automatically conditioned to display a stop indication until the switch is restored to the normal position, whereupon the signals will again display the clear indication.

If at this time the operator wishes to move the switches IW and 2W to their reverse positions to permit movement of trains between the two tracks, he can do so by moving the lever L from the position N to the position R. In order to effect this movement of the switch control lever L it is necessary to first move the signal control lever, not shown, to its center or intermediate position to thereby condition all ofv the signals associated with the switches IW and 2W to display the stop indication.

On movement of lever L away from position N I beyond position X, the contacts INX, ZNX and 3N2! are opened.

Onopening of contact 3NX the circuit controlled thereby for connecting wire Ifito wire 16 leading to the normal magnet valve devices is interrupted. However, contact. NB remains closed until the lever L is moved away from position N farther than position B,,and hence the circuit for energizing the normal magnet valve devices may not be interrupted until the lever L is moved beyond position ".8.

On opening of contact INX the pick-up circuit for the winding of relay NKR is interrupted, but at this time since contact 5! of.1relay NKR is picked up, a stick circuit is established by this contact from wire 36 to wire 28 leading to one terminal of the winding of .relay NKR. Accordingly, opening of contact INX is ineffective to deenergize the'winding of relay NKR.

.On opening of contact ZNX, however, .the supply of current from wire l6 leadingfromterminal G of battery It! to wire 40 leading to the contacts 4] and 6'2 associated with switch operated contact *1 il is interrupted and the circuit of the winding of relay NKR should be interrupted at this time. a i

If the equipment is operating in the intended manner, on opening of contact ZNX the supply of current to the'winding of relay NKR is .cut. ofi and contact 51, as well as the othercontacts of relay NKR, will become released after a brief time interval, thereby interrupting the stick circuit for the winding of relay NKRQ On release of contact 13 of relay NKR it engages contact 12 to thereby establish connection from wire I 6 to wire 14. This connection is traced from wire l6 through contacts 19-40 of relay RKR, wire "H, contacts 12-13 of relay NKR. and wire 14.

On movement of the lever L into the zone intermediate the points B and D, contact BD becomes closed and establishes connection from wire 14 towire 40. Since, as just pointed out,

connection is established from wire IE to wire 14 by the contacts of the indication relays, a circuit is now complete from wire I6 to Wire 40.

It will be seen that on release of contact 51 of relay NKR a circuit is established from wire 36 to one terminal of the winding of normal indication magnet NM, this circuit including wire 36, contacts 5'i59 ofrelay NKR and wire 6%.

As previously pointed out, the relay'NKR. is slow releasing so that the contacts of the relay remain picked up for a time interval subsequent 1 to movement of the lever L beyond the position X with resultant interruption of the circuit of the winding of relay NKR.

The slow releasing characteristic of the contacts of relay NKR insures that the winding of the normal indicationmagnet NM cannot be en- .ergized until after a brief time interval has elapsed subsequent to movement of lever L beyond position X. This time interval is of such duration that if the lever L is moved promptly and with the usual speed, it will be moved far enough so that the sloping face of the tooth 8t associated with the segment NM will not be engaged by the latch'or dog associated with the normal magnet NM when that latch becomes pickedup as a result of energization of the Winding of the magnet NM. I

If the latch should strike the sloping face of the teeth 85, it would not prevent movement of the lever-L, but the pressure of the latch on the face of the tooth would retard movement of the lever L and make movement of the lever diificult.

As pointed out above, on movement of the lever ing of normal indication magnet NM. Thewind ing of this magnet, therefore, is energized, but

aspreviously pointed out, before the magnet be comes energized the segment associated with this magnet will be moved far enough so that the latch does not engage the teeth carriedby the segment. v

The circuit for energizing the winding of the return movement of the lever NM to the p sition Nsinoe ifsuch movement of the lever is attempted at a time while the winding of normal'indication magnet NM is energized, the latch controlled by this magnet will engage tooth 86. s

It will be seen that on movement of the lever L to the zone BD to close the contact BD, the circuit for supplying current irom wire I6 to wire 40 is not complete until the contact I3 of relay NKR becomes released. Accordingly, on completion of the circuit from wire IE to wire 40, and resultant supply of current to wire 36 through the switch controlled contacts I and II, there is no possibility that current will be supplied to the winding of relay NKR' through the stick circuit which includes contact 51 of the relay, since the aforementioned connection between wire I6 and wire 36 is not complete until the contacts of the relay NKR become released, and hence not until the contact 51 interrupts the stick circuit for the winding of the relay NKR.

At this time the reverse indication magnet RM is not energized, and hence the latch controlled by this magnet will not engage tooth 89 carried by the segment associated with the magnet, and the lever L may be moved until the latch controlled by the magnet RM engages tooth 88,

When the lever L has been moved to the position permitted by tooth 88 on segment RM, the lever will be substantially at the position D and accordingly the contacts BD and RD will both be closed. As the contact RD is closed, a circuit is complete from wire I6 leading from terminal Gof battery I2 to wire 88 leading to the reverse magnet valve devices IRMV and 2RMV. This circuit is traced from wire I6 through contacts Iii-10 of relay RKR.,wire II, contacts 12-13 of relay NKR, wire 14 contact RD, wire 80 to one terminal of the winding of magnet valve device IRMV, wire 8I, winding of magnet valve device 2RMV, and wire I5 to terminal F of battery I2.

At this time as the lever L is at position D, the contact NB is open with the result that the windings of the normal'magnet valve devices NMV are interrupted while as the contacts of both indication relays arereleased, the previously traced circuit is established to energize the windings of the lock magnet valve devices As the reverse magnet valve devices RMV are energized and as the lock magnet valve devices LMV are also energized, fluid under pressure is supplied to the motors associated with the switches IW and 2W to effect movement of the switches to their reverse positions.

As the contact ED is closed at this time, connection is established from Wire 14 to wire 40 so that when the switches IW and 2W complete their movement to the reverse position, and switch controlled contacts III and II establish connection from wire 48 to wire 26, a circuit is established to energize the winding of reverse indication magnet RM. This circuit is traced from terminal G of battery I2 through wire I5,

contacts Iii-l8 of relay RKR, wire II, contacts 12'I3 of relay NKR, wire 'I4, lever controlled contact BD, wire 48, switch controlled contacts I0 and I I, wire 26, contacts 52--53 of relay RKR, wire 54, winding of reverse indication magnet RM, and wire I5 to terminal F of battery I2.

It should be observed that atthis time the contact IRY is open, and hence no circuit is established from wire 26 to the winding of reverse indication relay RKRwith the result thatthis winding is deenergized and contact 52 of the relay remains released.

When the lever L isin the position determined by the" tooth 88 the tooth 89 is-disposed' so that it will not interfere with further movement of the lever L towards position R on energization of the magnet RM.

Accordingly, on energization of the winding of magnet RM and movement of the latch as a result of energization of the magnet winding, the latch is moved out of the path of movement of the tooth 88 to thereby permit movement of the lever L to the position R.

On movement oi. the lever L'beyond the position D towards position R the contact BD becomes opened, thereby interrupting connection from wire 14 to wire 48, and accordingly inter- I rupting the energizing circuit of the winding of the reverse indication magnet RM. However, before this circuit is interrupted the lever L will have been moved far enough so that further movement of the lever will not be prevented by engagement of the tooth 88 with the latch associated with the reverse indication magnet RM. Accordingly, the lever L may be moved all of the way to the position R.

0n movement oi! the lever L'to the zone RY contact ZRY establishes connection from wire I6 leading from terminal G of battery I2 to wire 40, while asthe switches IW and 2W are still in their reverse positions, the switch controlled contacts I0 and II continue to establish connection between wire 40 and wire 26. Accordingly, on closing of contact IRY to establish connection from wire 26 to wire leading to one terminal of the winding of reverse indication relay RKR, the circuit for energizing the winding of relay RKR is complete and the winding of relay RKR becomes energized.

The energizing circuit for the winding of relay RKR is traced from terminal G of battery I2 through wire I6, contact ZRY, wire 40, switch controlled contacts I 0 and II, wire 25, contact IRY, wire 24, push button RPB, wire 20, winding of relay RKR, and wire I5 to terminal F of battery I2.

When the lever L is in the position R contact 3RY is closed and establishes a circuit from wire I 6 to wire 88 leading to the reverse magnet valve devices RMV to maintain those valve devices energizedto restore the switches IW and 2W to the reverse positions in the event either should creep therefrom. I

On picking up of the contacts of the reverse indication relay RKR contact I0 interrupts connection from wire I6 to Wire II, and thus interrupts the supply of current to the reverse magnet valve devices over the circuit which includes contact 13 of normal indication relay NKR. However, at this time the windings of these valve devices are energized by current supplied over the circuit controlled'by contact 3RY.

In addition, contact 6| of relay RKR is picked up and interrupts theconnection from wire I6to wire 62, and. thus interrupts the supply of current to wire 65 leading to the lock magnet valve device LMV. Accordingly, thelock magnet valve devices LMV are deenergized and prevent the supply of fluid under pressure to the motors associated with the switches [W and 2W.

When the switch control leverL is in the position R the signal control lever, not shown, may be moved from its intermediate or center position to permit clearing of selected ones of the signals associated with the switches IW and 2W. At this time. the contacts .of relay RKR are picked up. and contact 92 engagescontact 93 to complete the signal control circuit and permit clearing of the signals.

If while the lever L is in the position R one of the switches l W or 2W should creep from the reverse position, the contact controlled by that switch will interrupt connection from wire 40 to wire 26 with the result that the winding of reverse indication relay RKR will become deenergized. 1

On deenergization of the winding of relay RKR contact SI of the relay becomes released and reestablishes the supply of current to wire 65 leading to the lock magnet valve devices LMV. Accordingly, the windings of the lock magnet valve devices LMV will be energized and fluid under pressure will be supplied to the switch motors for the switches IW and 2W to restore these switches to their reverse positions.

On return of both of the switches to their reverse positions the contacts controlled by these switches again establish the circuit from wire to wire 25 with the result that the winding of relay RKR is again energized, and its contact 6| becomes picked up to interrupt the circuit for energizing the windings of the lock magnet valve devices LMV, and these valve devices thereupon operate to cut oil the further supply of fluid under pressure to the motors of the switches.

In addition on picking up of the contacts of relay RKR contact 52 is again picked up and engages contact to establish the stick circuit shunting the contact lRY and the reverse push button RPB.

On release of the contacts of relay RKR contact 92 becomes released and interrupts the signal control circuit which it controls to thereby condition the signals associated with the switches lW and 2W to display the stop indication.

When the switch is restored to the reverse position and the contacts of relay RKR become picked up, contact 92 again engages contact 93 to complete the signal control circuit so that the signals associated with the switches IW and 2W again display a clear indication.

If while the switches IW and 2W are in their reverse positions the operator desires to efiect movement of the switches to their normal positions, he may do so by moving the lever L from the reverse position R' to the normal position N. In order to efiect this movement of the switch control lever L it is necessary to first move the signal control lever, not shown, to its center or intermediate position to thereby condition all of the signals associated with the switches l W and 2W to display the stop indication- When the signal control lever, not shown, is in its center or intermediate position the switch control lever L may be moved from position R towards position N. On movement of the lever L away from position R beyond the point Y the contacts RY controlled by the switch are open. Opening of contact ERY interrupts. the supply of current from wire it leading from terminal G of battery H to wire 80 leading to the reverse magnet valve devices RMV.

Opening of contact ZRY interrupts connection from wire it leading fromterminal G of battery E2 to wire at, and thereby interrupts the sup-ply of current to the circuit for energizing the wind-. ing of reverse indicated relay RKR.

On opening of contact IRY the circuit con,- trolled thereby for establishing connection from wire it to wire 2!! leading-to one terminal of the. winding of reverse indication relay RKR is interrupted. However, at this time a circuit shunting the contact IRY is established by contact 52 of the relay RKR so that opening of contact IRY isz in'eiiective to cause deenergization of the wind ing of relay RKR, but, as previously pointed out, the winding ofv thisrelay normally becomes deenergized as a-result of opening of contact ZRY. Ondeenergization of'the relay winding contact 52 of the relay becomes released and interrupts the stick circuit'shunting the contact IRY.

In addition on release of the contacts of reverse indication relay RKR contact 6! of the relay becomes released and reestablishes the circuit for supplying currentto wire leading 'to the lock magnet: valve devices ILMV and, ZLMV with the result that the windings of these valve devices are energized, and the valve devices are conditioned to' permit the supply of fluid under pressure to the motors associated with the switches and interrupts this circuit to thereby efifect deenergization of the reverse magnet valve devices.

On release of the contacts of relay RKR. contact 52 engages contact 53 and a circuit may be established to energize the winding of reverse indication magnet RM. The relay RKR, however, is slow releasing so that its contacts will remain picked up for a brief time interval subsequent to interruption of the circuit of the relay winding by the contact 2RY, and this time in- .tervalis long enough to insure that if the lever L is moved away from position R. promptly and with the usual. speed, the lever will have been moved far enough before the Winding of reverse indication magnet RM becomes energized that the latch controlled by this magnet will not engage the sloping face' onthe tooth 89 on the segment associated with. the magnet RM. This insures; that movement of the lever L will not be impeded by engagement of the latch with the tooth 89. Y

On movement of the lever L to the position intermediate the points B and D,"the contact ED is closed to complete the circuit from terminal G of battery i2: to wire 413. This circuit is traced from wire it leading from terminal G of battery 12 through contacts 10+! of relay RKR, as soon as these contacts become released, wire ll, contacts l 2 l3 ofzrelay wire '54, and contact EU to; wire 40. r 1

' At this time-the switches 5W and 2W are still in their reverse positions with'the result that the switch controlled contacts it and II establish the circuit from wire 40: towire 26. At this time contact '52 of relay RKR is released so that a circuit is established from wire 26 to wire 55 leading from one terminal; of the winding of the reverse magnet RM, the other terminal of which has a branch of wire l5 leading'from terminal F of battery 12 connected thereto. Accordingly, the winding of the reverse magnet RM is energized and the latch controlled thereby becomes picked up and cooperates with tooth 89 to prevent return movement of the lever L'to the position R.

It willbe seen that on movement of the lever L to the zone BD to closethe contact BD, the circuit for supplying current from. wire- 16 to wire 4% is not complete until the contact it of relay RKR becomes released. Accordingly, on completion of'the circuit from wire it 'to wire 40, and "resultant supply of current to wire"2 6 through the switch controlled contacts I!) and II, there is no possibility that current will be supplied to the winding of the reverse indication relay RKR through the stick circuit which includes contact 52 of the relay, since the aforementioned circuit from wire IE to wire 26 is not complete until the contacts of the relay RKR. become released, and hence until contact 52 interrupts the stick circuit for the winding of relay RKR.

At this time the winding of the normal indication magnet NM is not energized and hence the latch associated with the magnet is not picked up. Accordingly, the lever L may be moved beyond the position intermediate the points B and D since the tooth 86 carried by the segment associated with the magnet NM will not engage the associated latch. However, the tooth on the segment will engage the associated latch and will prevent further movement of the lever L when the lever L has been moved substantially to the position B.

On movement of the lever L to the position B contact BD remains closed, while contact NB is closed.

At this time as the contacts of the reverse indication relay'RKR are released, as previously pointed out, and as the contacts of the normal indication relay NKR are also released, the circuit controlled by the contacts of these relays for establishing connection from wire IE to wire 65 leading to the lock magnet valve devices LMV is complete, and these valve devices are conditioned to permit the supply of fluid under pressure to the motors for the switches IW and 2W.

On closure of contact NB the circuit is completed from wire 16 to wire 16 leading to the normal magnet valve devices NMV. This circuit is traced from wire l6 through contacts l9-10 of relay RKR, wire I I contacts 12-13 of relay NKR, wire 14, contact NB and wire 16.

At this time, therefore, the windings of the normal magnet valve devices NMV will become energized, and will efiect the supply of fluid under pressure to the motors for the switches IW and 2W to cause movement of the switches to their normal positions.

On movement of the switches IW and 2W away from their reverse positions, the contacts I!) and II interrupt connection from wire 40 to wire 26 with the result that the winding of reverse indication magnet RM becomes deenergized.

When the switches IW and 2W complete their movement to the normal position the contacts In and II establish connection from wire 40 to wire 36, and, as contact 5'! of relay NKR is released, a circuit is established from wire 36 to wire 60 leading to one terminal of the winding of normal indication magnet NM, and the winding of this magnet becomes energized.

The circuit for energizing the winding of normal indication magnet NM is traced from terminal G of battery I! through wire l6, contacts Ill-Hi of reverse indication relay RKR, wire ll, contacts 12-13 of normal indication relay Nm, wire 14, lever controlled contact BD, wire 40, switch controlled contacts In and I l, wire 35, contacts 5'l-59 of normal indication relay NKR, wire 60, winding of magnet NM, and wire l5 to terminal F of battery l2.

On energization of the winding of the normal indication magnet NM, the latch controlled by the magnetwinding becomes picked up and no longer is engaged by tooth 85 of the segment as- -'s'ociated with the magnet so that the lever L may be moved from position 13 to position N.

Onmovement of the lever L out of the zone between: the points B and'D the contact ED is opened, "thereby interrupting connection from terminal G of battery It to wire 4% with resultant deenergization of the winding of magnet NM. However, before the winding of this magnet is deenergized, the lever L will have been moved far enough towards the position N that the latch associated with the magnet NM will not engage the tooth 85 and interfere with continued movement of the lever L towards the position N.

On movement of the lever L to position N the contacts NX become closed, and contact 3NX establishes a circuit from wire l6 to wire 16 leading to the normal magnet valve devices NMV to maintain these valve devices energized so that they will effect the'su'pply of fluid under pressure to the motors for the switches IW and 2W, and cause the motors to return the switches to their normal positions if either switch should creep therefrom.

When the lever L is in position N contact 2NX is closed and establishes connection directly from wire I 6 to wire 40, while contact INX is closed and establishes connection from wire 36 to wire 28 leading to one terminal of the winding of normal indication relay NKR. As the switches IW and 2W are now'in their normal positions, the switch controlled contacts I!) and II. establish connection between wire 40 and wire 35 so that the energizing circuit for the winding of normal indication relay NKR is complete. This circuit is traced fromterminal G of battery l2 through wire I6, contact ZNX, wire 40, switch controlled contacts I!) and H, wire 36, contact INX, push button NPB, wire 28, winding of relay NKR, and wire l5 to terminal F of battery l2.

On energization of the winding of the normal indication relay -NKR, the contacts of this relay become picked up and contact 51 becomes picked up to both interrupt the circuit for energizing the win-ding of normal indication magnet NM, and to establish a stick circuit from wire 36 to wire 28 which shunts the contact INX.

On picking up of the contacts of relay NKR contact 13 of there-lay interrupts one connection from wire [6 to wire 16 leading to the normal magnet valve devices NMV, but at this time a circuit is established directly from wire I6 to wire 16 by contact 3NX so that the normal magnet valve devices are maintained'energized as previously explained.

In addition on picking up of the contacts of normal indication relay NKR contact 64 interrupts the circuit from wire I6 to wire 65 leading to the windings of the lock magnet valve devices LMV, and these valve devices cut off the supply of fluid under pressure to the motors for the switches'lW and 2W.

If while the lever L is in position N either of the switches should creep from its normal position, the contact controlled by that switch will interrupt connection from wire 40 to wire 36, thereby interrupting the energizing circuit for the winding of the normal indication relay NKR, and the contacts of this relay will become released. As a result, contact 64 of relay NKR will again establish the circuit for energizing the lock magnet valve devices LMV, and these valve devices will operate to supply fluid under pressure to the motors for the switches IW and 2W to effect return of the switch to the normal position.

On return of the switch to the normal position connection will again be established between wire 48 and wire 36, and the winding of the normal indication relay NKR. will again be energized, while the contacts of the relay will be picked up and contact 64 will interrupt the circuit for energizing the lock magnet valve devices, and these valve devices will cut off the supply of fluid under pressure to the switch motors.

While the lever L is in position N, the signal control lever, not shown, may be moved from its intermediate position to effect clearing of selected ones of the signals associated with the switches [W and 2W. These signals may be cleared at this time since contact 96 of relay NKR. is picked up and completes the circuit which it controls.

The system provided by this invention is arranged to prevent improper operation of portions of the system in the event a cross should exist between the circuits for energizing the indication relays, or if for any other reason current is improperly supplied to one of these circuits at any point therein at a time when current should not be so supplied.

For purposes of illustration it will be assumed that the lever L is in the position N, that the switches IW and 2W are in their normal positions, and that a cross or other condition exists which results in a connection independent of contact ZNX from terminal G of battery l2 or other source of current to wire 40 or wire 36.

When the lever L is in position N and the switches IW and 2W are in their normal positions, the winding of the normal indication relay NKR is energized by current supplied over a circuit which is traced from terminal G of bat,- tery l2 through wire'l6, contact ZNX, wire 40, switch controlled contacts [0 and II, wire 36,

contact INX, push button NPB, wire 28, winding of relay NKR, and wire IE to terminal F of battery [2.

As the winding of indication relay NKR is energized, the contacts of this relay are picked up and contact 57 engages contact 58 to establish a stick circuit for the relay winding, this stick circuit shunting the contact INX and the push button NPB.

Under normal operating conditions opening of contact ENX interrupts the circuit of the winding of relay NKR so that the contacts of this relay become released.

When a connection independent of the contact ZNX is established to wire 48 or to wire 36, as is here assumed to be the case, opening of contact ZNX does not result in deenergization of the winding of relay NKR since current is improperly supplied thereto at this time.

As the relay winding remains energized, contact 51 remains picked up and establishes the stick circuit shunting the contact INX so that opening of contact INX will not interrupt the circuit of the winding of relay NKR.

Under the circumstances outlined above on movement of the lever L away from position N to a point in the zone BD, which movement is permitted when the normal indication magnet NM is deenergized, opening of the contacts INX and ZNX will not result in deenergization of the winding of relay NKR, and the contacts of relay NKR will remain picked up.

At this time the winding of the reverse indication magnet RM is deenergized as no connection is established by the switch control contacts I0 and H to wire 26, and hence the lever L may be moved towards the position R as far as the tooth 88 permits, that is, to the position D.

When the lever L is in position D contacts BD and RD are closed, but as the contact 13 of relay NKR is picked up, no connection is established from Wire I6 to wire M, and hence closing of contacts BD and RD is without result, and no current is supplied through contact RD to energize the reverse magnet valve devices RMV. These valve devices, therefore, are deenergized, while the normal magnet valve devices became deenergized when contact 3NX was opened as a result of movement of the lever L to the zone BD.

At this time, since the contacts of the relay NKR are picked up, contact 64 interrupts the,

circuit of the lock magnet'valve devices LMV.

It will be seen, therefore, that at this time all of the magnet valve devices are deenergized, and the switches IW and 2W, therefore, will remain in their normal positions.

As the switches [W and 2W remain in their normal positions, the switch controlled contacts l8 and II do not complete a circuit to the wire 26 and the reverse indication magnet RM remains deenergized. Since the reverse indication magnet RM remains deenergized, the latch associated with this magnet continues to engage the tooth 88 and prevent movement of the lever L farther towards the position R.

At this time as the contacts of relay NKR are picked up, contact 51 interrupts the circuit of the winding of the magnet NM with the result that on movement of lever L away from'position N farther than position B, the latch associated with the magnet NM will engage tooth to prevent return movement of the lever L beyond the position B.

Lever L, therefore, will be confined to the zone BD and cannot be moved therefrom until one or the other of the indication magnets NM or RM is energized.

Normal indication magnet NM cannot be energized until contact 51 of relay NKR is released,

which will not occur until the improper supply of current to the relay winding is prevented.

The reverse indication magnet RM cannot be energized until the switches IW and 2W are moved to their reverse positions so that the contacts I8 and II establish connection from wire 40 to wire 26. The switches [W and 2W'cannot be moved to the reverse positions until the contacts of relay NKR become released and permit the circuits of the magnet valve devices to be completed. The contacts of the relay NKR will not become released until the improper supply of current to the relay winding is prevented.

It will be seen, therefore, that the lever Lwill be confined to the zone 3-D and cannot be moved therefrom until the defective condition which results in improper energization of the winding of relay NKR is corrected.

The inability of the operator to move the lever L in the customary manner will inform him that the equipment is not functioning as intended and he must thereupon take steps to correct the difficulty.

The equipment operates in a similar manner if while the control lever L is in position R and the switches IW and 2W are in their reverse positions, a circuit isimproperly establishedfrom terminal G of battery l2 or some other source of current to the wire 48 or to the wire 26.

When the lever L is in position R .and. the

switches IW and 2W are in their reverse posi- 75 tions, the winding of reverse indication relay RKR is energized by current supplied over a circuit which is traced from terminal G of battery I! through wire l6, contact ZRY, wire 40, switch controlled contacts I and H, wire 26, contact IRY, push button RPB, wire 20, winding of relay RKR and wire I to terminal F of battery l2.

As the winding of relay RKR is energized, the contacts of this relay are picked up and contact 52 engages contact 55 to establish a stick circuit for the winding of the relay RKR, this stick circuit shunting the contact IRY and the push button RPB.

Under normal operating conditions the opening of contact ZRY interrupts the circuit of the winding of the relay RKR so that the contacts of this relay will become released.

When a connection independent of the contact ZRY is established to wire 40 or when connection is established to wire 26, as is here assumed to be the case, opening of the contact 2RY does not result in deenergization of the Winding of relay RKR.

As the winding of relay RKR is energized, contact 52 is picked up and establishes the stick circuit shunting the .contact lRY so that opening of contact lRY will not interrupt the circuit of the winding of the relay RKR.

Under the circumstances outlined above, on movement of the lever L away from the position R to a position in the zone intermediate the points B and D, which movement is permitted when thereverse indication magnet RM is deenergized, opening of the contacts IRY and ZRY will not result in deenergization of the winding of the relay RKR, and the contacts of the relay RKR, therefore, will remain picked up. H I

At this time the normal indication magnet NM is deenergized since it is assumed that the switches IW and 2W are in their reverse posi-. tions, and hence the contacts l0 and II, do not establish connection to the wire 36. Since the normal indication magnet NM is deenergized, the lever L may be moved towards the position N as far as the tooth 85 permits, that is, to the position B.

When the lever L is in the position B contacts BD and. NB are closed, but as the contacts of relay RKR is picked up, no connection is established from wire l6 to wire I4, and hence closing of the contacts BD and NB is without result, and no current is supplied through contact NB to energize the normal magnet valve devices NMV. These valve devices, therefore, remain deenergized, while the reverse magnet valve devices became deenergized when the contact 3RY was opened on movement of the lever L to position B.

At this time since the contacts of the relay RKR are picked up, contact 6| interrupts the circuit of the lock magnet devices LMV.

It will be seen, therefore, that at this time all of the valve devices are deenergized, and accordingly the switches IW and 2W will remain in their reverse positions.

As the switches IW and 2W remain in their reverse positions, the switch controlled contacts [0 and II do not establish connection fromwire 40 to the wire 36 and the normal indication magnet remains deenergized. Since the magnet NM remains deenergized, the latch associatedwith this magnet continues to engage the tooth 85 and prevents movement of the lever L farther towards the position N than point B.

At this time as the contacts of relay RKR are picked up, contact 52'interrupts the circuit of the winding of the reverse indication magnet RM with the-result that on movement of the lever L away from the position R farther than the position D, the latch associated with the magnet RM will engage the tooth 88 to prevent return movement of the lever L beyond the position D. 1 V

The lever L,'therefore, will be confined to the zone D-B and cannot be moved therefrom until one or the other of the indication magnets is energized.

The reverse indication magnetRM cannot be energized until the contact 51 of relay RKR is released, which will not occur until the improper supply of current to the relay winding is prevented.

The normal indication magnet NM cannot be energized until the switches IW and 2W are moved to their normal positions and the contacts l0 and II establish connection from wire 40 to wire 36. The switches IW and 2W cannot be moved to their normal positions until the contacts of the relay RKR become released and permit the circuits of the magnet valve devices to be completed. The contacts of relay RKR will not be released until the improper supply of ourrentto the relay winding is prevented.

It will be seen, therefore, that lever L will be confined to the zone DB and cannot be moved therefrom until the defective condition which results in improper energization of relay RKR. is corrected.

The inability of the operator to move the lever Lin the customary manner will inform him that the equipment is not functioning as intended, and he must thereupon take steps to correct the difficulty.

The push buttons NPB and RPB provide convenient means to test the integrity of the stick circuits for the normal and reverse indication relays to thereby enable an inspector or other service attendant to ascertain Whether or not the stick circuits will operate as intended to maintain the relay windings energized in the event of a crossed wire or other condition which results in the improper supply of current to the relay winding.

The push buttons NPB and RPB are preferably located adjacent the relays with which they are associated so that an inspector may operate the pushbutton to interrupt the circuit for one of the relays, and at the same time observe the relay armature to see whether or not it remains picked up or-becomes released.

In order to test the stickcircuit for the normal indication relay NKR the switch control lever L is moved to the position N, if it is not already in that position, to thereby cause the switches IW and 2W to occupy their normal positions.

At this time connection is established from terminal G of battery [2 to one terminal of the winding of relay NKR by a circuit which includes wire [6, contact 2NX, wire 40, switch controlled contacts I0 and II, wire 36, contact INX, push button NPB, wire 28 to one terminal of the windforthe' relay winding,.this circuit shunting the contact INX and the push button NPB.

In order to test the integrity of the stick circuit for relay NKR pressure is supplied to the movable contact 3! of the push button NPB to move it out of engagement with contacts 38 and 32. This opens one circuit for establishing connection from wire 36 to wire 28 leading to one terminal of the winding of relay NKR.

If at this time the stick circuit is intact and establishes connection from wire 35 to wire 28, the winding of relay NKR will be maintained energized by current supplied to the stick circuit.

By observing the relay armature to see whether it remains picked up or becomes released, the inspector or attendant may ascertain whether or not the winding of relay NKR continues to be energized after the push button contacts are opened. I

If the relay winding does continue to be energized, the relay armature will' be maintained picked up on opening of the push button contact, while if the relay winding is not maintained energized at that time, the relay armature will become released .and the attendant will know that measures should be taken to reestablish the stick circuit for the relay winding.

The integrity of the stick circuit forthe winding of reverse indication relay RKR is tested in a similar manner. In order to test this circuit the switch control lever L is moved to the position R, if it is not already in that position, to thereby cause the switches IW and 2W to occupy their reverse positions.

At this time connection is established from terminal G of battery l2 to one terminal of the winding of reverse indication relay RKR by a circuit which includes wire It, contact ZRY, wire 46, switch controlled contacts l0 and H, wire 25, contact IRY, push button RPB, and wire 20 to one terminal of the winding of relay RKR, the other terminal of which is connected by wire 15 to terminal F of battery i2.

As the winding of relay RKR is energized, the contacts of the relay are picked up and contact 52 engages contact 55 to establish a stick circuit for the relay winding, this stick circuit shunting the contact IRY and the push button RPB.

In order to test the integrity of the stick circuit pressure is applied to the movable contact 22 of push button RPB to move it out of engagement with contacts 2| and 23. This opens one circuit for establishing connection "from wire 26 to wire 20 leading to one terminal of the winding of relay RKR.

If at this time the stick circuit for the relay winding is intact and establishes connection from wire 26 to wire Ell, the winding of relay RKR will be maintained energized by current supplied to the stick circuit.

By observing the relay armature to see whether it remains picked up or becomes released, the inspector or attendant may ascertain whether or not the winding of relay RKR continues to be energized after the push button contacts are opened.

If the relay winding does continue to be energized after opening or" the push button contacts, the relay armature will be maintained picked up, while if the relay winding is not maintained energized at that time, the relay armature will become released and the attendant will know that measures should be taken to reestablish the stick circuit for the relay winding,

It will be seen that the system provided by this invention checks the integrity of the circuits for energizing the windings of the indication relays in such a manner that a cross between the wires for supplying current to the relay windings, or the improper supply of current to one of these wires for any other reason, will be promptly detected. This will be true because if such condition exists, an indication relay will be improperly energized and the switch control lever cannot thereafter be moved to its other position, while the positions of the switches cannot be changed.

Thus it will be seen that if for any reason connection is improperly established from terminal G of battery it or other source of current to wire it or to the wires 28 or St, or ii a cross should exist between these or other wires .so that current is improperly supplied to one of the wires 26 or 35, or if an improper connection should be established by the contacts associated with the switches, the stick circuits controlled by the contacts of the indication relays will maintain one of the indication relays energized to thereby prevent manipulation of the switch controlled lever L, and prevent a change in the position of the switches lW and 2W.

Although I have herein shown and described only one form of improved switch control and indication system embodying my invention, it is understood that various changes and modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of my invention.

Having thus describedmy invention, what I claim is:

1. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a control lever. movable between a normal and a reverse position, said lever also having a normal, indication position in which it conditions the motor to move the switch to the normal position and a reverse indication position in which it conditions the motor to move the switch to the reverse position, a normal indication magnet operable only when energized to permit movement of the control lever from the normal indication position to thenormal position, a reverse indication magnet operable only when energized to permit movement of the control le er from the reverse indication position to the reverse position, a normal indication relay operablev only when deenergized to establish a circuit to permit energization of the normal indication magnet, a reverse'indication relay operable only when deenergized to establish a circuit to permit energization of the reverse indication magnet, a common supply conductor, means operable only in the normal position of the switch to establish connection from said common supply conductor to a normal supply conductor, means operable only in the reverse position of the switch to establish connection from said common supply conductor to a reverse supply conductor, and

means controlled by the control lever for establishing connection from a source of current to said common supply conductor, for establishing connection from the normal supply conductor to the winding of the normal indication relay, and for establishing connection from the reversesupply conductor to the winding of the reverse indication relay, each of the indication relays being operable when energized to establish a connection independent of the control lever from the corresponding supply conductor to the relay winding.

2. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a control lever movable between a normal and a reverse position, said lever also having a normal indication position in which it conditions the motor to move the switch to the normal position and a reverse indication position in which it conditions the motor to move the switch to the reverse position, a normal indication magnet operable only when energized to permit movement of the control lever from the normal indication position to the normal position, a reverse indication magnet operable only when energized to permit movement of the control lever from the reverse indication position to the reverse position, a normal indication relay operable only when deenergized to establish a circuit to permit energization of the normal indication magnet, a reverse indication relay operable only when deenergized to establish a circuit to permit energization of the reverse indication magnet, a common supply conductor, means operable only in the normal position of the switch to establish connection from said common supply conductor to a normal supply conductor, means operable only in the reverse position of the switch to establish connection from said common supply conductor to a reverse supply conductor, and means controlled by the control lever for establishing connection from a source of current to said common supply conductor, for establishing connection from the normal supply conducQor to the winding of the normal indication relay, and for establishing connection from the reverse supply conductor to the winding of the reverse indication relay, each of the indication relays being operable when energized to establish a connection independent of the control lever from the corresponding supply conductor to the relay winding, each of the indication relays having associated therewith means for interrupting the connection established by the control lever between the relay winding and the corresponding supply conductor.

3. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch,*a control lever movable between a normal and a reverse position, said lever also having a normal indication position in which it conditions the motor to move the switch to the normal position and a reverse indication position in which it conditions the motor to move the switch to the reverse position, a normal indication magnet operable only when energized to permit movement of the control lever from the normal indication position to the normal position, a reverse indication magnet operable only when energized to permit movement of the control lever from the reverse indication position to the reverse position, a common supply conductor, means operable only in the normal position of the switch to establish connection from said common supply conductor to a normal supply conductor, means operable only in the reverse position of the switch to establish connection from said common supply conductor to a reverse supply conductor, a normal indication relay operable only when deenergized to establish connection from the normal supply conductor to the winding of the normal indication magnet, a reverse indication relay operable only when deenergized to establish connection from the reverse supply conductor to the reverse indication magnet, and means controlled by said control lever for establishing connection from a source of current to said common supply conductor, for establishing connection from the normal supply conductor to the winding of the normal indication relay, and for establishing connection from the reverse supply conductor to the winding of the reverse indication relay, each of the indication relays being operable when energized to establish a connection independent of the control lever from the corresponding supply conductor to the relay winding.

4. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a control lever movable between a normal and a reverse position, said lever also having a normal indication position in which it conditions the motor to move the switch to the normal position and a reverse indication position in which it conditions the motor to move the switch to the reverse position, a normal indication magnet operable only when energized to permit movement of the control lever from the normal indication position to the normal position, a reverse indication magnet operable only when energized to permit movement of the control lever from the reverse indication position to the reverse position, a common supply conductor, means operable only in the normal position of the switch to establish connection from said common supply conductor to a normal supply conductor, means operable only in the reverse position of the switch to establish connection from said common supply conductor to a reverse supply conductor, a normal indication relay operable only when deenergized to establish connection from the normal supply conductor to the winding of the normal indication magnet, a reverse indication relay operable only when deenergized to establish connection from the reverse supply conductor to the reverse indication magnet, and means controlled by said control lever for establishing connection from a source of current to said common supply conductor, for establishing connection from the normal supply conductor to the winding of the normal indication relay, and for establishing connection from the reverse supply conductor to the winding of the reverse indication relay, each of the indication relays being operable when energized to establish a connection independent of the control lever from the corresponding supply conductor to the relay winding, each of the indication relays having associated therewith means for interrupting the connection established by the control lever between the relay winding and the corresponding supply conductor.

5. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a control lever movable between a normal and a reverse position, said lever also having a normal and a reverse indication position, a normal indication magnet operable only when energized to permit movement of the control lever from the normal indication position to the normal position, a reverse indication magnet operable only when energized to permit movement of the control lever from the reverse indication position to the reverse position, a normal indication relay operable only when deenergized to establish a circuit to permit energization of the normal indication magnet, a reverse indication relay operable only when deenergized to establish a circuit to permit energization of the reverse indication magnet, the control lever being operable in the normal indication position to establish a normal controlcircuit to condition the motor to move the switch to the normal position, the control lever being operable in the reverse indication position to establish a reverse control circuit to condition the motor to move the switch to the reverse position, said con trol circuits being complete only when both indication relays are deenergized, means operable only in the normal position of the switch to establish a circuit through which current may be supplied to energize the normal indication relay or the normal indication magnet, means operable only in the reverse position of the switch to establish a circuit through which current may besup plied to energize the reverse-indication relay or the reverse indication magnet, and means controlled by the control lever and controlling the circuits of the windings of the normal and reverse indication relays.

6. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a control lever movable between a normal and a reverse position, said lever also having a normal and a reverse indication position, a normal indication magnet operable only when energized to permit movement of the control lever from the normal indication position to the normal position, a reverse indication magnet operable only when energized to permit movement of the control lever from the reverse indication position to the reverse position, a normal and a reverse supply conductor, means operable only in the normal position of the switch to establish connection from a source of current to the normal supply conductor, means operable only in the reverse position of the switch to establish connection from a source of current to the reverse supply conductor, a normal indication relay operable only when deenergized to establish connection between said normal supply conductor and the winding of the normal indication magnet, and a reverse indication relay operable only when deenergized to establish connection between said reverse supply conductor and the winding of the reverse indication magnet, the control lever.

being operable in the normal indication position to establish a normal control circuit to condition the motor to move the switch to the normal position and being operable in the reverse indication position to establish a reverse control circuit to condition the motor to move the switch to the reverse position, said control circuits being controlled by said indication relays and being complete only when said indication relays are both deenergized, the control lever being operable in the normal position to establish connection from the normal supply conductor to thewinding of the normal indication relay, said control lever being operable in the reverse position to establish connection from the reverse supply conductor to the winding of the reverse indication relay.

'7. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a control lever movable between a normal and a reverse position, said lever also having a normal and a reverse indication position, a normal indication magnet operable only when energized to permit movement of the control lever from the normal indication position to the normal position, a reverse indication magnet operable only when energized to permit movement of the control lever from the reverse indication position to the reverse position,

a normal and a reverse supply conductor, means operable only in the normal position of the switch to establish connection from a source of current to the normal supply conductor, means operable only in the reverse position of the switch to establish connection from a source of current :to the reverse supply conductor, a normal indication relay operable only when deenergized to establish connection between said normal supply conductor and the winding of the normal indication magnet, and a reverse indication relay operable only when deenergized to establish connection between said reverse supply conductor and the winding of the reverse indication mag- ,net, the control lever being operable in the normal indication position to establish a normal control circuit to condition the motor to move the switch to the normal position and being operable in the reverse indication position to establish a reverse control circuit to condition the motor to move the switch to the reverse position, said control circuits being controlled by said indication relays and being complete only when said indication relays are both deenergized, the control lever being operable in the normal position to establish connection from the normal supply conductor to the winding of the normal indication relay, said control lever being operable in the reverse position to establish connection from the reverse supply conductor to the winding of the reverse indication relay, each of said indication relays being operable when energized to establish connection independent of the control lever from the corresponding supply conductor to therelay winding.

8. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a control lever movable between a normal and a reverse position, said lever also having a normal and a reverse indication position, a normal indication magnet operable only when energized to permit,

movement of the control lever from the normal indication position to the normal position, a reverse indication magnet operable only when energized to permit movement of the control lever from the reverse indication position to the reverse position, a common supply conductor, a normal and a reverse supply conductor, means operable only in the normal position of the switch 'to establish connection between the common and the normal supply conductors, means operable" only in the reverse position of the switch to establish connection between the common and. the reverse supply conductors, a normal indication relay operable only when deenergized to establish connection between said normal supply conductor and the winding of the normal indication magnet, and a reverse indication relay operable only when deenergized to establish connection between said reverse supply conductor and the winding of the reverse indication magnet, thecontrol lever being operable in the normal indication position to establish a normal control circuit to condition the motor to move the switch to the normal position and being operable in the reverse indication position to establish a reversecontrol circuit to condition the motor to move the switch to the reverse position, said control circuits being controlled by said indication relays and being complete only when said indication relays are both deenergized, said control lever being operable in the normal or reverse position and also in the normal indication or reverse indication position to establish connection from one terminal of a source of current to said common supply conductor, the control lever being operable to interrupt such connection when in a position intermediate the normal indication and normal positions or intermediate the reverse indication and reverse positions, the control lever being bperable in the normal position to establish connection from the normal supply conductor to the winding of the normal indication relay and being operable in the reverse position to establish connection from the reverse supply conductor to the winding of the reverse indication relay.

9. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a control lever movable between a normal and a reverse position, said lever also having a normal and a reverse indication position, a normal indication magnet operable only when energized to permit movement of the controllever from the normal indication position to the normal position, a reverse indication magnet operable only when energized to permit movement of the control lever from the reverse indication position to the reverse position, a common supply conductor, a normal and a reverse supply conductor, means operable only in the'normal position of the switch to establish connection between the common and the normal supply conductors, means operable only in the reverse position of the switch to establish connection between the common and the reverse supply conductors, a normal indication relay operable only when deenergized to establish connection between said normal supply conductor and the winding of the normal indication magnet, and a reverse indication relay operable only when de- .energized to establish connection between said reverse supply conductor and the winding of the reverse indication magnet, the control lever being operable in the normal indication position to establish a normal control circuit to condition the motorto move the switch to the normal position and being operable in the reverse indication position to establish a reverse control circuit to condition the motor to move the switch to the reverse position, said control circuits being controlled by said indication relays and being complete only when said indication relays are both deenergized, said control lever being operable in the normal or reverse position and also in the normal indication or reverse indication position to establish connection from one terminal of a source of current to said common supply conductor, the control lever being operable to interrupt such connection when in a position intermediate the normal indication and normal positions or intermediate the reverse indication and reverse positions, the control lever being operable in the normal position to establish connection from the normal supply conductor to the winding of the normal indication relay and being operable in the reverse position to establish connection from the reverse supply conductor to the winding of the reverse indication relay, each of said indication relays being operable when energized to establish connection independent of the control lever from the corresponding supply conductor to the relay winding.

10. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a control lever movable between a normal and a reverse position, said lever also having a normal and a reverse indication position, a normal indication magnet operable only when energized to permit movement of the control lever from the normal indication position to the normal position, a reverse indication magnet operable only when energized to permit movement of the control lever from the reverse indication position to the reverse position, a normal and a reverse supply conductor, means operable only in the normal from a source of current to the normal supply conductor, means operable only in the reverse position of the switch to establish connection from a source of current to the reverse supply conductor, a normal indication relay operable only when deenergized to establish connection between said normal supply conductor and the winding of the normal indication magnet and a reverse indication relay operable only when deenergized to establish connection between said reverse supply conductor and the winding of the reverse indication magnet, the control lever being operable in the normal indication position to establish a normal control circuit to condition the motor to move the switch to the normal position, and being operable in the reverse indication position to establish a reverse control circuit to condition the motor to move the switch to the reverse position, said control circuits being conposition of the switch to establish connection trolled by said indication relays and being complete only when said indication relays are both deenergized, the control lever being operable in the normal position to establish connection from the normal supply conductor to the winding of the normal indication relay, said control lever being operable in the reverse position to establish connection from the reverse supply conductor to the winding of the reverse indication relay, each of said indication relays being operable when energized to establish connection independent of the control lever from the corresponding supply conductor to the relay winding, each of said indication relays having associated therewith means for interrupting the connection established by the control lever between the relay winding and the corresponding supply conductor.

11. In combination, a railway track switch movable between a normal and a reverse position, a motor for moving said switch, a switch control lever movable between a normal and a reverseposition and controlling said motor, a normal and a reverse indication magnet controlling movement of said switch control lever, a normal and a reverse indication relay, means controlled by said lever and by the position of the switch for energizing said indication relays, means controlled by the position of the switch and by each of said relays for also energizing its own winding, and. means controlled by said relays and by the position of the switch for energizing said indication magnets.

HENRY S. YOUNG.

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