US1929047A - Remote control apparatus - Google Patents

Description

Oct. 3, 1933. E. M. ALLEN ET AL REMOTE CONTROL APPARATUS Original Filed Feb. 17, 1950 INVENTORSZ 5..19/16/7, lq Q B Bro 0K5,

a if M (Lial bodying our invention.

Patented Oct. 3, 1933 1,929,047 nEMoT E ooN'rRoL APPARATUS Earl Allen and chimes A. Brooks; Swissvale, Pa.., assignorsto The Unionzswitch & Signal- "Company, Swissvale, 1 Pennsylvania Pa., a corporation of Application February 1 7, 1930. Serial No. 428,966

" Renewed March 27,1931

29 Claims (Cl. a n) Our invention'relates to remote control apparatus, and has for anobject the provision of novel and improved apparatus -for controlling railway trafiic governing-devices such as switches 5 and signals from a distant point.

We will describe one form of apparatus embodying our invention, andwill then point out 15, stretches Y and Z adj acent switch G are divided the novel features thereof in claims. ,7 The accompanying drawing is a diagrammatic view showing one form of apparatus em- 'Referring to the drawing, the reference characters 1 and 1f? designate the track rails of a stretch Y of railway track connected by means .of a switch G with a stretch Z. Portions of i by means of insulated joints 2 to form track sections AB, CD, B,E-D .and -E-F. Each of these sections is provided with a track circuit which includes a battery 3 connected across the j rails adjacent one end of the section, and a track relay designated by the reference character 'T with a distinguishing exponent and connected across the rails adjacent the v opposite end oi the section. V I Signalsdesignated by the reference characters S S 5 andS govern eastbound trallic moves, that is, moves toward the right as shown in the drawing, overswitch G, and signals S S and S 9. govern westbound moves over switch G. Signals Sl S S and S governmoves over switch G in its normal position as shown, for directing traflic along stretch Y only. Signals 8 S S and S 9; govern moves over switch G reversed, from or to stretch Z respectively. As shown in the drawing, each" ofthese signals is of the semaphore type. Each of the signals operates a contact arm which connectswith'a given terminal when the signal. is indicating stop,

' 4 andwhich connects With'a second terminal when the signal is indicating proceed, For example, signal S operates contact arm 35, which connects with terminal 35 when signal S is indicating stop, and which connects with terminal 35 when signal S 9 is indicating proceed.

Switch G, as here shown, is operated by a fluid pressure motor M which is controlled by a lock magnet L and by normal and reverse magnets N and 63 to theleft, asshown'in the drawing,;and

contact arms to theright; I a

Operated in conjunction with switch G are contact arms 21 and 27 which connect with terminals Zl and 27 respectively, when and only when switch G is in its'normal position. Conwhich,'when inagnet R is energized, swings these times except while switch G is in its normal position; Contacts 62- -62 6161 and 64,=also op.- erated in conjunction with switch G, are closed at all times except while switch G is in its. reverse position. Contacts-62-,62 and 61--61 are closed when and only verse position.

.S witch relay I-I is energizable inthe normal or the-reverse direction by a circuit whichsis controlled by amanually operable lever .V 1 Lever V .has two positions,- a normal'position n and .a

when switch G isin. its re- 7 Switch indication relay K is controlled by Fill:

contact arms 20 and 63 which are operated by magnets N andR, and is also controlled by the V 7 contact arms which are operated in conjunction with switch G, and by switchrelayH If the lay K is ,deen'ergized, relay H responds; but the resistance of the circuit is great enough to prevent the flow of suflicient current to operate-an H? and which is shown'adjacent levefV When motor M responds to control" by reIayJ-I -and moves switch G to a correspondingposition, relay K be comes energized in a direction which corresponds with the position" of switch G and control circuit for relay H is energized while reindication relay h whichisin series with relay I H with the directionof energizat-ion'of relayI-I Relay K uponbecoming -energized, forms a shunt path around, a resistance'9 in the clrcuit for relay H uand also around a portion of the winding of relay H ythus permitting suflicient andv at the sametime toret ain the contacts of relay H 'in an" energized position. r

' Normal and reverse switch indication relays. k and'k areenergized when relay K is enercurrent to flow in the circuit to;operate-relay]:

gized in the normal or thejreverse direction, re-

spectively. V V V Signals S are controlled by apolarizedzsigna relayH One of the signals'SP- or'one of the S are indicating stop. A proceed signal indica-- tion relay K is energized when and only when any one of the signals S or S is indicating proceed. A signal stick relay I is controlled by stop' signal indication relays K and K and by track relay T An approach locking stick relay U is controlled by traflic conditions .as well as by stop signal indication relay K and by a manually operable contact P An approach locking stick relay U is similarly controlled by traffic conditions as well'as by stop signal indication relay K and by a manually operable contact P "The energization of relay H in the normal or the reverse direction is controlled by a manually operable lever V having a normal position m, a reverseposition to the left I, and a reverse positiontothe right it. The. lever V operates a contact arm 70 which, when the lever is in its position, connects with a terminal 70 and whenthe lever is in its t position, connects with a terminal '70". A contact arm 93, also operated by lever V similarly connects with a terminal 93 when lever V is in its] position, and connects with a a terminal 93 when the lever is in its t position.

If the circuit for relay H is energized while I proceed signal indication relay K is deenergized,

relay H will respond, but the current flowing will. beinsufficient to operate a second proceed signal indication relay h which is connected in series with relay H Upon the clearing of a signal due to the .energization' of relay H relay K becomes energized. Relay K upon becoming energized, forms a shunt path around a resistance 67 which is in series with relays h? and H This shunt path also passes around a portion of the winding of relay H With the resistance of the circuit thus reduced, sufficient current will flow to operate relay h as well as to retain the contactsrof relay H in an energized position.

'; Indicators, here shown as electric lamps each of which is designated by the reference character e witha distinguishing exponent, are placed adjacent levers V and V5 for the information of theoperator. Lamp e is controlled by a back contact of relay h and, when lighted, at times indicates thattrack section BED is occupied. Lamp e ,.when lighted during an operation of switch G from one position to the other, indicates that the movement of switch G has not yetbeen completed. in response to a change of positionof lever .V Lamps e, and e arev controlled by contacts 2929 and 2929 respectively, of lever V as well as by a' front contact of relay, h Lamp e when lighted, indicates that switch G is in the normal position while lever V is in its nposition, and lamp .e indicates that switch G is inthe reverse position while lever V5 is in its 1 position. Lamp c is controlled by a back contact of relay h and, when lighted, indicatesthatnone ofthe signals is inspectively, of lever V ,and by a front contact of relay n5. Lamp e, when lighted, indicates that A one of the signals S controlled by lever V when in its j position, is indicating proceed. Lamp e,

and the winding of relay I to terminal 0.

and K are energized. Relay W has a, stick circuit which includes a portion'of'the circuit for relay H comprising relay h contact '?0--70 or "IO--70 of lever Y and a battery Q or a battery Q respectively.

As here shown, batteries Q and Q also supply energy for lighting indicator lamps e. Current for controllingthe local circuits for switch G and signals S is supplied by a battery Q and a battery Q In the drawing, the contacts operated by the various relays are identified by numbers, such numbers having suitable distinguishable exponents when'such contacts are not shown adjacent the respective relays by which they are operated. Theexponent for each of these contact numbers comprises the reference character and exponent for the respective relay. For example, the exponent K for contact '73 shown "in the local control circuits for signals S comprises the reference character K and the exponent S for stop signal indication relay K which operates;

contact. 73 Similarly, the exponent W for contact 89 in the local circuit for signal S comprises the reference character W for call-on relay W which operates contact 89 7 Having thus described, in general, the arrangement, operation, and location of the various parts comprising our invention, we'will now trace in detail the operation of the apparatus.

As shown in the drawing, all parts are in their normal condition, that is, lever V is in its n position, lever V is in its m position, switch G is in its normal position, all signals are indicating stop, and all track sections are clear.

With signals S indicating stop, stop signal indication relay K is energized by its circuit passing from terminal 3: of battery Q through contacts 35-35, 36-36, 37-37 and 3838 of signals S ts S and S, respectively, and the winding of relay K to the other terminal 0 'of battery Q 'With signals S indicating stop, stop signal indication relay K is energized by its circuit passing from terminal r through contacts 3939, 40-40 and 4141 of signals S S and 8 respectively, and the winding of relay K to terminal 0. I

With relays T and T energized, approach locking relay U is energized by its circuit passing from terminal 1 through contact 46 of relay T contact 47 of relay T and the winding of relay U to terminal 0. A stick circuit for relay U is also completed, passing from terminals r through contact 48 of relay K contact 51 of relay U and the winding of relay U to terminal 0. Withrelay T energized, approach locking relay U is energized by its circuit passing from terminal r through contact 52 of relay T and the winding of relay U to terminal 0. A

stick circuit for relay U is also completed, passing from terminal m through contact 53 of relay K contact 57 of relay U and the winding of relay U to terminal 0;

With relays T K and K energized, the pick-upcircuit for relay'I is completed, passing from terminal x through contact 42 of relay T contact 43 of relay-K contact 44 of relay K A stick Jt ry Q- s r f lay'H energized in' the normal direction, as well circuit for relay I is also completed, passing fi'om terminal :0 through contact 42 of relay atum ,5-5-of lever, V winding of relay h wire 6,

contact 7'", wirelO, contact 11 of relay K wire 12, aportion of the winding of relay H and wires 13 and 13 back to. batteryQ With relay H energized in thenormal direction and with relays I, U andU energized normal magnet N for switch G is energized byits circuit passing Iromterminal r of battery Q through-front contacts 14 1 5 and'lfi contacts 17 andlB of relay H wire 19, the winding ofmagnet N to terminal 0, and throughbattery Q back to bat- Wlth 'magnetN energized'and with reas with switch G inthe normal position, relay through contact 20 --2 0 operated by magnet N,

contact 21 -2l or switch contacts 22 and 23 of relay H winding of relay K contacts 24 and 25a *0: relay H wire. 26, and contact l7-2'7 of switch G to terminal 0. With relay K energized in thenormal direction, normal indication relay k is energized by its circuit passing from terminal :cflthrough contacts 33 and 34 of relay K f'andthewinding of relay k to terminal 0.

lflow to operate relay h With relay It? thus .28, contact 29-29 of, lever V and'contact 30 of relay 119 back to battery Q energized, lamp c is lightecl by its circuit passing Irom battery Q through wire 13, lamp'e wire The circuit Ior relays h and'I-li is open at contact arm '70 of 'lever v and henceboth these ,relaysare deenergized.

We will now assume that the operator desires to arrange for a train to move from stretch Z to stretch Y over" switch G reversed. He therefore moves lever V to the '1 position, and lever V to the t position. Lever V upon being moved from the n position toward the 1' position, breaks, at its contact 5 -5; the circuits for relays h and H Relay H upon becoming deenergized, opens its contacts 23 and 24 causing relay K to be deenergized and open its contact 11.

When lever V reaches its r position, relays h and H will be energized in the reverse direction by a circuit passing from battery Q through wires 13* and 13 winding of relay H resistance 9, wire 8, contact '7', wire 6, winding of relay h and contact 5'5' of lever'V back to battery Q Relay H upon becoming energized in the reverse direction, completes a shunt circuit for relay K passing from relay K, through contacts '23 and relayK will become deenergized eventhough'- the circuit first traced for relays h and H should be supplied with current of reverse polarity I h and; close its front contact 31*. With contact .il

before relay K has openedits contact 11.

With relay H energized in the. reverse direction, a circuit is completed for .magnet R of Gg passing from terminals: of battery'Q Upon the beginning of the operation of switch battery Q otmagnet R to terminal 0. -With relay K deenergized, a circuit for lock magnet L is also completed, passing fromterminal x of battery Q through contact 59 of relay K ,-wire 60, and the winding of magnet L to terminal 0. With magnetsLand R thus energized, motor M is so controlled as to move sw'itchG to the reverse position.

G, contact arms2l and 27 are moved to connect with terminals 21 and 27,"respectively, and contact"65"is closed; With contact 6 5"closed, a second circuit is completed'for magnet L, passing from terminal :2 of battery Q through contacts 64 and '65 of switch G, wire 60, and the winding of magnet L to terminal 0. Upon the completion of=the operation of switch G to its reverse position, contact arms 62 and 61 are moved to' connect-with terminals 62*. and 61 respectively, and contact 64 is opened.

K? is energized in the normal direction by its circuit passing from terminal 3: of battery On account, of magnet R being energized, armature has moved'contact arms 20 and 63 to connect'with terminals 20 and 63 respectivelyfand hence when contact arms 62 and 61100 are 'ino'ved; as just described, a reverse control circuit is'completed for relay K passing from tact 62-62 of switch G, and contact 6363 of rnagriet R to terminal'o. Relay K upon becoming energized, againcompletes, through its contact 11, the shunt path previously traced 'around resistance 9 and a' portion of the winding of relay H Uponthe completion of this shunt pathfsufficientcurrent flows through the circuit for relays h andH to cause relay h to again become energized. I

While relay M has been deenergizedJamp e has beenlighted by its circuit passing from battery Qfl through wire 13, lamp e and contact 30 of relay h back to batteryQ.

Lamp 6 while thus lighted, has been indicating to the leverman that switch G has not yet completed its movement to the reverse position. Upon the 'reenergization' of relay h as just described, lamp 6 becomes extinguished, and lamp e becomes lighted by its circuit passing from battery Q through wire 13*, lamp e, contact 29 29 of Iev'er'VQand contact 30 of relay h back to With lampe lighted, the operator knows that switch G has been moved to thereverse position in response to the movement of battery Q supplies current of reverse polarity to relays h and H 'by a circuitrpassing from battery Qflthrough wires 13?, 13", 13 and 13 winding of relay H resistance 67; wires 69 and 69, winding of relay 'h and contact 'l0'70 of lever V back to battery QM Relay H responds by closing its contacts 71 and 72', but the current flowing in the circuit is not suificient tocause' relay it to open its back contact 31 closed while leverfV is in its t position, lamp emialighted by its circuit passing from battery Qflthrough' wire liifielamp e wire 32, contact 150 31 of relay h and contact -70? of lever V back to battery Q. I i

.With relay H energized in the reverse direction as justldescribed, and with relay k energized, a circuit is completed for signal S P, passingfrom terminal 2 of battery Q through contacts 71 and 72 of relay H5, contacts 73 74 76'", andthe mechanism of signal S to terminal 0. The arm of signals now movesto its proceed position, breaking at its contact 37-37. the circuitrfor relay K and then completing at its contact 3737 the {circuit for relay K passing from terminal at of battery passing around resistance 67 and a portion of the winding of relay H reduces the resistance in the circuit for relays 11 and Hi and so permits suflicient current to flow through the circuitto cause relay it to open its back contact 31 and close its front contact 31 Upon the opening of contact 31 lamp e becomes extinguished, and

upon the closing of contact'31 lamp c becomes lighted by its circuit passingrfrom battery Q through wire 4 contact 31 of relay h contact 9393 of lever N lamp eRand wire 13 -back to battery Q With lamp e? lighted, the operator knows'that the arm of signal S has been operated to the proceed position in responseto the movement of lever V to its 25 position and the operation of switch G to its reverse position.

We will now assume that an eastbound train approaching signal S};deenergizes relay T The stickvcircuit already traced for relay U has been broken at contact 48 upon the deenergization of relay K and hence, upon the deenergization of relay T which causes its contact 47 to open in the pick-up circuit previously traced for relay U relay U becomes deenergized. Relay U upon becoming deenergized, breaks, at thefront point of'its contact 15, the circuit previously traced for magnet R of switch G, and completes at the back point of its contact l5 a second circuit for magnet R passing from terminal 3: of battery Q through front contact 14 back contast 15, contact 94 of relay K wire 58, and" the winding of magnet R to terminal 0. 7 It follows that with relay U deenergized, the position of switch G can not be influenced by a change in direction of the energization of relay H As the train proceeds past signal 8 it deenergizes relay T causing relay I to be deenergized. Relay 1, upon becoming deenergized,

breaks, at its front contact M the second circuit just traced for magnet R, and completes, at its back contact. 14 a third circuit for magnet R, which is the same as the second circuit except passing through the back contact 14 rinstead of through the front contact l4 and back contact 15. It follows, therefore, that while relay I is deenergized, switch G will not be influenced section -C-D, deenergizing relay U as previously by any change in the directionof energization of relay H Relay- I, upon becoming deenergized, also opens its contact 75 in the circuit previously traced for signals. The arm of signal S thereupon moves to its stop position, breaking, at it s'contact 37-37% the circuit/for relay K and then completing, at'its contact .37-37, the circuit previously traced for relay ing of relay H The current flowing in the cirt1 cuit of relaysh and H is thereby so reduced as to cause relay h toopen its front contact 31 and close its back contact 31 Lamp e is thus extinguished, and lamp e is again light as previously described, indicating to the operator that (111 the arm of signal sl 'has left its proceed position. k i J The circuit for .relays'h. and H 'is open at contact 7?, causing relay n to become deenergized and extinguishlamp e and then light I lamp e The lighting of lamp e now indicates to the operator that a train has entered section B-E-D. Relay H 'is also deenergized, causing relay K tobe deenergized and to again complete the circuit for lock magnet L through contact 59 of relayK With relay K deenergized, relay k is deenergize'd due to the opening of contact 33 of relay K The train, upon entering section EF while relay T is deenergized, completes, at contact 50 U to terminal o.- A pick-up circuit commonly" includes back contacts of ..tw0, track relays in series as, for example, contacts 49 and 50 of ;relays T and T respectively, in the second pickup circuit which we have traced for relay U The use of back contacts of two track'relays in series instead of a back contact of only one track relay prevents thepossibility of a relay such as relay U becoming, energized by an incorrect K then again becomes energized, completing the shunt path p'reviously traced around 'resisting pick-up circuit fora relay such as relay U T ance 9 anda portion of the winding of relay BED, relay I becomes energized by its pickupcircuit previously traced. I

When the train leaves section E,F, the circuit previously traced for the arm of signal 5 is again-completed at contact 76, causing the arm. of signal S to move to the proceed position All parts of the apparatus will now again attain the same condition as before the train entered section C-D while signal S was in dicating proceed. l I

We will now assume that another trainenters described in connection with the first'train. We

will further assume that before the train passes signal S the operator decides to hold the train at signal S and to arrange theapparatus .foreathird train to move along stretch Y over swltchG in the normal position. The operator The operator is rec from the operator, close contact P thereby completing a third pick-up circuit for relay U passing from terminal x through contact 48 of relay K contact P and the winding of relay U to terminal 0. With relay U energized,

the operator can, by returning lever V to its n position, cause the circuit previously traced for magnet N to be again completed and the circuit first traced for magnet L through. contact 59 of relay K to also be completed. Switch G will thereupon be returned to its normal position. .7

We will next assume that switch G has been again reversed as previously described, and that the arm of signal S has been moved to its proceed position. We will further assume that an eastbound train has passed signal S, and that, before the train has passed out of section EF, the operator desires to permit a following train to pass signal 8 On account of relay T or relay T being deenergized, the arm, of signal S 9 is now in its stop position, and hence relay K is'energized. The operator .will depress push button P thereby completing a pick-up circuit for relay W, passing from battery Q, through'wires 13*, -13 andl3, winding of relay W, contacts 87 and 86 push button P contact 31 of relay it and contact 70'l0 of lever V back to battery Q Relay W, upon becoming energized, completes its stick circuit passing from battery Q through wires 13 13 and 13; winding of relay W, contact 88 of relay W, wire 69, winding of relay h and contact 7070b of lever V back to battery Q With relay W energized, a circuit is completed for signal S, passing from terminal zt' 'of battery Q throughcontacts '71 and 72P'of relay H contacts 73 '74 and 90", and the mechanism of signal S to' terminal 0. The arm of signal S is thereupon moved to its proceed position.

We have described for a few typical conditions the operation of the apparatus comprising our invention. Following this description, the operation of the apparatus for every other possible condition will'b'e readily understood by re!- erence to the drawing.

is occupied, and that a second light is constantly displayed when switch F occupies its reverse position except while section B-E- -D is occnpied. It will alsobe noted that a light is constantly displayed when any one of the eastboundsignals is indicating proceed, and that a second light will be constantly displayed when any one of the westbound signals is indicating Although we have herein shown and described onlyone form of remote control apparatus embodying our invention, it is understood that variouschanges' and modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of our invention.

Having thus described our invention, what we claim is:

1. In combination, an electro-responsive de-j' vice,.a controlcircuit for said. device, an indication means responsive only to current of greater magnitude than the current necessary iOr controlling said device, and' means 'controlledfby" said device for reducing. the": resistance infs aid circuit to permit sufiicient currenti to flow for controlling said indication means as well as said device, Y: 7

2. In combination, an EIECtIOrIGSDOIlSlVQ 'device, a control circuit for said device, an indication means responsive only to current of greater magnitude than the current necessaryTor, putting said device into 'agiven condition, and means controlled by said device for reducing the resistance in said. circuit" to vpermit s ufllcieint current to flow for controlling said indication means as well as for continuingsaid device in said condition.

j 3. In combination, a railway tramcgoverning" device, a relay for controlling 'saiddevice, an ine dication means responsive only to current of greater magnitudethan is necessaryfor operating said relay, a circuit forsaid relay. and said indication means, and means controlled by saidv traflic governing device;for' removing'a portion of the'winding of saidrelay from said circuit to permit current to fiowfor controlling said indication means as well as for retaining the contact of said relay in the same position as before.

4. In combination, a railway'traflic governing device, a'pair of conductors, means forat times supplying said conductors with current for controlling an operation or said devicejanindication means, and means controlled by saidv governing device for increasing the currentsuppliedto said conductors to cause said indication means to display a ,constant indication ,of the condition of said device.

5. In combination, an electro-responsive de-' vice,.an indicationmeans, a controlcircuit for said device and said indication means, means for supplying said circuit with current to which said device but not said indicationmeajns responds, and means controlled'iby said device for supply: ing'said circuit with current to which said indication means as well as said device responds.

6; In' combination, an electro-responsive device, an indication'means, a control circuit for. said device'and said indication means, means: for supplying said circuit with current to which said device but not said indication meansresponds, and means controlled by said device when. said device has responded to said current for supply inc, Said circuit with current to which sa'idiindb cation means as well as said device responds.

7. In. combination, a railway track switch, a, polarized switch relay for controlling operations of said switch to the normal or-the. reverse position according as said relay is energized in the normal or the reverse direction, an indication means, a control circuit for said relay and said indication means, means for supplying said current with current of normal or reverse polarity to which said switch relay but ,not said indication means re.- sponds, and means controlled by said switch for supplying said circuit with current to which said indicationfme'ans as well as said switch relay. responds. V

8., In combination, a railway-track switch, a.

i a control circuit for said relay and saidindication means, means for supplying said circuit with current of normal or reverse polarity to which said" 6 r 7,. switch relay, but not said indication means responds, an indication relay energized when and onlywhen said switch occupies a position corresponding to the-direction of energization of said switch relay, andmeans controlled by said indication relay for supplying said circuit with current to which said indication'means' aswell as said switch relay responds.

9. In combination, arailway' track'switch, a

polarized indication relay controlled by said switch, and means controlled by polar contacts of'said relay for at times retaining said switch in the position to which said switch has lastprepolar contacts. of said indication relay for at times retaining said switch in the position to which said switch'has last previously been operated.

11. In combination, a railway track switch, manually operable means for controlling the switch, an indication relay controlled by said switch, and meanscontrolled by said indication relay according to tramc conditions for controllingsaidswitch independently of said manually operable means.

12. In combination, a railway track' switch,

-;manual1y' operable means for controlling the switch, an indicationf'relay controlled by said switch, a signal for governing trafiic movements over said switch, and means controlled bysaid indication relay according to the condition of -said signal for controlling. said switch independently of .said' manually operable means.

i 13. In combination, a railway signal, a control means forsaid signal, an indication means, means for supplying said control means and said indi- 3 cation means with current to which said'control means but not said indication means responds, and means controlled by said signal for supplying said control means and said indication means with current to which said indication means as well as said control means responds. V 14. In combination, a railway track switch,

manually operable means for controlling the switch, an indication means controlled by said switch, a signal ior governing traflic movements oversaid switch, and means controlled by said signal 'according to'the condition of said indication means for controlling said switch independently of saidmanually operable means.

15. In combination, a railway track switch,

manually' operable means for controlling said switch, an indication means controlled by said switch, and means controlled by trafii'cconditions according to the condition of said indication meansfor controlling said switch independently of said manually operable means.

16. In combination, a railway track switch,

operating mechanism for said switch comprising a normal and a reversemagnetas well asa lock magnet, a control circuit for said switch, a polarized indication relay energized in the normal or the reverse direction according as said s it h i j said lock magnet controlled by aback neutral] in its normal orits reverse position when and only when said circuit is energized in the normal or the reverse direction respectively,'a circuit for contact of said indication relay, a circuit for said normal magnet controlled by a normal polar contact of said relay, and a circuit for said reverse magnet controlled by a reverse polar contact of saidrelay.

17, In combination, a railway signal, a signal relay for controlling said signal, a control circuit for said relay, a call-on control relay for said signal, a manually controlled pick-up circuit for said call-on relay, and a stick circuit for said callon relay comprising the control circuit for said signal relay.

18. In combination, a railway signal, a signal relay for controlling said signal, a control circuit for said relay, a call-on control relay for said 1 signal, a pick-up circuit for said call-on relay, and

a stick circuit for said call-on relay comprising the control circuit for said signal relay.

19. In combination, a railway signal, an approach track circuit for said signal including a track relay, a second and a third track circuit each of which includes a track relay, an approach.

locking relay, a circuit for said approach locking relay controlled by said approach track relay, and a second circuit for said approach locking relay including a back contact of said second track relayinseries with a back contact of said third track relay and controlled by said signal.

20..In combination, a railway signal, an approach track circuit for said signal including a track relay, a second and a third track circuit I 105 each of which includes a track relay, an approach locking stick relay, a pick-up circuit for said approach locking relay controlled by said approach track relay, a second pick-up circuit for said approach locking relay including a back contact of said second track relay in series with a back contact of said third track relay, and a stick circuit for said approach locking relay controlled by said signal.

21. In combination, a railway track switch, a normal control device for said switch, a reverse control device for said switch, a normal control circuit controlled by said normal control device, a reverse control circuit controlled by said reverse control device, a, normal indication contact so controlled by said switch as to become closed when the switch is moved to its normal position, a reverseindication contact so controlled by said switch as to become closed when the switch is moved to its reverse position, means for at times transferring the control of said normal control circuit from said normal control device to said normal indication contact, means for at times transferring the control of said reverse control circuit from said reverse control device to said reverse indication contact, and means controlled by said normal and reverse control circuits, for controlling operations of said switch to its normal and reverse positions respectively.

22. In combination,'a stretch of railway track containing a switch, a polarized switch relay, a normal, control circuit controlled by a normal contact of said switch relay, a reverse control cir-' cuit controlled by a'reverse contact of said switch relay, a polarized indication relay controlled by said switch, means controlled by track circuit conditions in said stretch for at times transferring the control of said normal control circuit from the normalcontact of said switch relay to a normal contact of said indication relay and for at times transferring the control of said reverse control circuit from the reverse contact of said switch relay to a reverse contact of said indication relay, and means controlled by said normal and reverse control 'circuitsfor controlling operations of said switch to its normal and reverse positions respectively.

23. In combination, a stretch of railway track containing a switch, a switch relay, means controlled by said switch relay for controlling said switch, an indication relay controlled by said switch, and means controlled by trafiic conditions in said stretch for at times transferring the control of said switch fromsaid switch relay to said indication relay.

24. In combination, a stretch of railway track containing a switch, a signal governing traflic movements over said switch, a stick relay having a pick-up and a stick circuit one of which is controlled by said signal and the other of which is controlled by track circuit conditions in said stretch, a switch relay, means controlled by said switch relay for controlling said switch, an indication relay controlled by said switch, and means controlled by said stick relay for at times transferring the control of said switch from said switch relay to said indication relay.

25. In combination, a stretch of railway track containing a switch, a traffic relay controlled by traffic conditions in said stretch, a polarized switch relay, a polarized indication relay so controlled by said switch as to be energized in the normal or the reverse direction according as said switch is in its normal or its reverse position respectively, a normal control circuit for said switch including a front contact of said trafiic relay and a normal contact of said switch relay in series, a second normal control circuit for said switch including a back contact of said trafiic relay and a normal contact of said indication relay in series, a reverse control circuit for said switch including the front contact of said traflic relay and a reverse contact of said switch relay in series, a second reverse control circuit for said switch including the back contact of said traffic relay and a reverse contact of said indication relay in series, and means controlled by said normal and reverse control circuits for operating said switch to its normal and reverse positions respectively.

26. In' combination, a section of railway track containing a switch, an approach section adjoining said switch section, a signal for governing traffic movements through said switch section into said approach section, an approach locking relay, a track circuit for said switch section including a track relay, a track circuit for said approach section including a second track relay, a

pick-up circuit for said approach locking relay including aback contact of said first track relay in series with a back contact of said second track relay, a stick circuit for said stick relay energized only if said signal indicates stop, and means controlled by said approach locking relay for controlling said switch.

27. In combination, a section of railway track containing a switch, an approach section adjoining said switch section, a second approach section adjoining said switch section, a signal for governing traflic movements over said switch, an approach locking relay, a circuit controlled by trafiic conditions in said first approach section and including the winding of said relay for controlling said relay, a second circuit controlled jointly by trafiic conditions in said switch section and traflic conditions in said second approach section and including the winding of said relay for controlling said relay, a third circuit controlled by said signal for controlling said relay, and means controlled by said relay for controlling said switch.

28. In combination, a section of railway track containing a switch, an approach section, a signal for governing traffic movements through said switch section into said approach section, a track circuit for. said approach section including a track relay, a locking relay, a pick-up circuit for said locking relay including the winding of said locking relay and a back contact of said track relay,

a stick circuit for said locking relay controlled tion including a track relay, a pick-up circuit for said locking relay including a back contact of said track relay and controlled by said signal, a stick circuit for said locking relay controlled by said signal, and means controlled by said locking relay for at times operating said switch while said track relay is deenergized.

EARL M. ALLEN. CHARLES A. BROOKS.

DISCLAIMER 1,929,047.-Earl M. Allen and Charles A. Brooks, Swissvale, Pa. REMOTE CONTROL APPARATUS. Patent dated October 3, 1933. Disclaimer filed March 15, 1985, by the assignee, The Union Switch ct Signal Company. Hereby disclaims the subject matter of claims 19, 20, and 27. [Ofilclal Gazette April 9, 1.935.]

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