US1620690A - Railway-traffic-governing apparatus - Google Patents

Description

March 15,1927.

' D. W. RICHARDS -ET AL RAILWAY TRAFFIC GOVERNING APPARATUS Filed A fil 25, 1922 4 Sheets-Sheet 1 INVENTORSI Z3. W. Rial/ward? m -QP. Hqmw ak,

{1% ATTORNEY 1,62 0 March D.'W. RICHARDS ET AL 069 RAILWAY TRAFFIC GOVE RNING APPARATUS Filed April 25. 1922 4 Sheets-Sheet 2 m 22 N k INVENTOR 5 I D. W. R/bh arms a Q.- z'zfiw ATTORNEY March 15,1927, 90

D. w. RICHARDS ET AL,

RAILWAY TRAFFIC GOVERNING APPARATUS Filed April 25. I922 4 Sheets-Sheet 5 INYENTORS D. W R/chdrds 4 74 H.Y/ Hqncaak,

UM" ATTORNEY 1,620,690 March 1927 D. w. RICHARDS ET AL RAILWAY TRAFFIC GOVERNING APPARATUS Filed April 25. 1922 4 Sheets-Sheet 4 we r 00 m.- gfig g 104 wm 4 Fly 9 W INVENTOR s:

D-W- l hqrds '0 163 Hanan ck,

'V'm ATTORNEY Patented Mar. 15, 1927.

UNITED STATES PATENT OFFIE.

DANIEL W. RICHARDS AND HARRY P. HANCOCK, OF ROANOKE, VIRGINIA.

RAILWAY-TRAFFIO-GOVERNING APPARATUS.

Application filcd April 25, 1922. Serial No. 556,506.

()ur invention relates to railway tratiic governing apparatus, and has for an object the provision of means For controlling tratlic governing devices. such as railway signals. 5 from a distant POllltSllt'lltlS a dcspatchers oliice. Another object of our invention is the provision of means for enabling a train despatcher or other otiicial to beinformed when a signal at a distant point changes 10 from one indication to another, thereby enabling him to locate a train.

\Ve will describe one form of apparatus embodying our invention and will then point out the novel features thereof in claims.

In the accompanying drawings, Figs. 1 and 1 are diagrammatic views which when placed end to end in the order named. illustrate one form of controlling and indicating apparatus embodying our inven- 29 tion, and which views will hereinafter be referred to collectively as Fig. 1. Fig. '2 is a view showing in side elevation one form of device which may beattached to the semaphore signals shown in Fig. 1 for transmitting an impulse combination and forgoverning onc or more circuits. Fig. 3 is' a top plan view of the device shown in Fig. 2.

Fig. 4 is a perspective View of .the code wheel forming part of the device shown in Figs. 2 and Fig. 5 is a sectional view on the line. V of Fig. 3 looking in the direction indicated by the arrow. Fig. (3 is a View similar to Fig. 5 but showing a modified arrangement ot' gearing for :ausing re ieatcd operations 01'. the code wheel instead of a single operation' Fig. 7 is a plan view showing one form of thermal circuit controller which may be used in connection with the apparatus shown in Fig. 1. Fig. 8 is a side elevation of the control'er shown in Fig.

7. and Fig. 9 is a sectional view on the line l X-1XJ ot Fig. 8 looking in the direction indicated by the arrow.

'Similar re iercnce characters refer to similar parts in each of the several views.

Referring first to Fig. the reference characters 22 and .22 designate thev track rails of a railway along which traffic normal ly moves in the direction indicated by the arrows. 'lrafiic moving insuch direction governed by a seriesotsignals S. S" and S, which are located at. suitab'e intervals .a nd are controlled in theusual and well ltuown manner hvineans of track circuits.

lit)

.known commercial devices.

These track circuits are provided as usual by dividing the track rails by insulated joints 23 into a series of electrically isolated sections V-W, W-X, X-Y, etc., and the track circuit for each section comprises the truck rails of the section, a source of current 6, which as here shown is a battery, and a track relay designated by the reference. character T wit-h a suitab'e exponent. The controlling circuits for the signals will be explained hereinafter in discussing the operation of the system as a whole, it being sutlicient to point out at. the present time that each signal is controlled automatically by the track relays in such manner that the signal indicates Stop when the corresponding track section is occupied, Caution when the corresponding section is unoccupied and the section next in advance is occupied, and Proceed when the corresponding section and the section next in advance are bothunoccupied.

In accordance with our invention these signals contro'led in part from a central location 5, which is usually the office of a train despatcher or other proper otticial. This control is atllected by selectors associated with each signal. together with means in the despatchers office for transmitting impulse combinations to which such selectors are responsive. These selectors may be Gill selectors, Model 1333. which selectors are well In addition to this. the despatchers otlice is provided with selectors and the signals are provided with apparatus for transmitting impulse coinbinations to the last-mentioned selectors,- thereby giving the despat cher information concerning the'condition or operation of the Jsignals.

In order to illustrate the operation of the. apparatus. we will assume. that the despat'cher desires to be informed as to the indication given by signal S for ,the purpose of locating a train in the section governed by this signal and for which reason he also desires to determine when this signhl moves to the stop -iosition. To do this he operates code he -.-\-in the de i nitchefs oifice Z,'thercb causing operation of a telcgraph relay 24 through a circuit whichincludes a battery and the contact 36 of the key A. 'lhe operation of relay 24: causes the transmission of an impulse combination from qucnt closing of contact 8 of this selector closes a circuit for relay M, which circuit passes from battery 16, through wires 79, 81, 82, and 83, contact 8, right-hand winding 84 of selector F wire 85, winding of relay M wires 86, 87, and 88, manually operable key 17, and wire 89 to battery 16. The closing of relay M closes at contact 22 a circuit 'for a lamp L which circuit passes from the secondary of a transformer U, through wire 90, lamp L wire 91, contact "22, and wire 02 to the secondary o't' transformer U. The primary of transformer U is connected with an alternating current transmission line 02), which in practice will usually be an electric lighting line. The lighting of lamp it illdicates to the despatcher that a train has passed signal S y The momentary opening-of contact lgust before signal s reaches the stop position .opens the holding circuit for relay 1), so

that this relay becomes dc-energized. The parts of the apparatus are then restored to the conditions in which they are shown n the drawing.

We will now assume that signal S is in the proceed or caution position, and that the despatcherdesires to place this signal at stop. To accomplish this the despatcher first operates. his code key A, thereby cans ing relay D to close as before. He then operates his code key G, which key transmits the impulse combination to which selector H in signal S responds. While contact of this selector is closed, a repeating relay J is energized by virtue of a circuit which passes from battery 12, through wires 39 and 94,

contact 9, winding 95, wires 96 and 97, relay J, wires 98, 45 and 46, to battery 12. The closing of contact 10 of relay J closes a pick-up circuit for a stick relay K, which circuit passes from battery 11, through wires 47, 48, 55, 58 and 100, contact 10 of relay J, Wire 101-, contact 13 of relay D, wire 102, winding of relay K, and wires 103, 53 and 51 to battery 11. As soon as relay K closes, a stick circuit for this relay becomes closed, which circuit passes from battery 11, through wires 47, 48, 55, and 107, back con-' tact 14 of relay 0, wire 108, contact 109 of relay K, wire 110, winding of relay K, and

I wires 103, 53 and 54 to battery 11. Theclosing of relay K opens at back contact 15 the caution indication ircuit for signal 8, which circuit is from battery 11, through wires 17 and 111, back contact 15, wire 1.12; contact 113 of track relay T wire 114, operating mechanism of signal S", and wires 115 and 54 to battery 11. Signal S" then moves to the stop position. \Vhen a train reaches signal S it will, of course, come to a stop and the train crew can then communicate with the despatchcr by means of a telephone N which is located adjacent signal S and is connected across the line Bil-29. Haringplaced signal S" in the stop position the despatcher "an restore it to caution or proceed position by operating code key A, thereby actuating selector B, which in turn energizes relay t. The open ing of back Contact 14 of relay opens the stick circuit for relay li. so that the caution "indication circuit for signal S" is again closed at contact 15, whereupon the signal returns to the caution or pl'occcal position, provided that'trafi ic condition:-: In advance of this signal are, such as to pcrmit the signal 7 of selectorH, windinpof this selector.

wires 96 and 172, contact 173 of relay K, wire 17-1, contact (35, wire (36, bell E, and wires 67, 75 and 4G to battery 12. The intermittent current in this circuit due to hell E will cause impulses to be induced in line wires 28 and 29 by virtue of transformer action in selector H, and so the despatcher will know by the sound in his telephone N that the signal is at stop. By this means the despatchcr is informed that the block controlled by signal S is occupied, and so he is enabled by trial to locate a train. The annunciation may be discontinued as before by operating key B.

One important feature of the apparatus is that, eventhough a signal is at stop owing to the presence of a train, the signalmav be held in this position to stop a following: train, this being accomplished by the necc; sary steps on the part of the dcspatchcr to close relay K. The dcspatcher can subscquently place the signal in condition to clear when the block becomes unoccupied. this be ing done as before by causing relay K to; open.

Although we lnnc l|()\\'ll only two i'hill keys A and (1" in the dcspatchcrs oliicc 71, it is understood that a similar pair of keys will be provided for each signal which is controlled from this oflice. That is to say, a similar pair of keys will he provided for the operation of selectors B and H at signal S, and a third pair of keys will be providcd for the operation of selectors ll and H at signal S.

\Ve will now assume that the (l0::])zll(ll0l' desires to trace the movement of a train "com the time that it passes signal S to the time :that it. passes signal S. To do this he operates each of his indication code keys A, thereby closing contact 2 in the selector B at each signal S .S and S". This results in energizing relay D at each signal. "When a train passes signal S the consequent movement of this signal to the stop position transmits an impulse combination over the line wires 28 and 29 which actuates selector F in the dcspatchcrs oiiice. \Vhile contact 8 of this selector is closed. a pick-up circuit for relay M is closed, which circuit passes from battery 16, through wires 79, 81, 82,

19 115) and 120. contact 8 of selector F winding 121 of this selector, wire 122, winding of relay M, wires 123 and 88, key 17, and wire 8!) to battery 16. As soon as relay M closes, a stick circuit for this relay becomes closed, which circuit passes from battery 16, through wires 79, t2 and 125, back contact 18 of relay M, wire 126, contact 127 of relay M, wire 128, winding of relay M wires 123 and 88, key 17. and wire 89 to battery 16.

20 The closing of relay M closes a circuit for lamp L. which circuit passes from transformer U, through wire 90, lamp L wire 1525), contact. 15) of relay M and wires- 13d and 92 to-transiormer l7. When the train passes signal S it sends an impulse combination over the line wires .28 and 2-9 which causes operation of the selector F in the despatchers ofi'ice. \Vhile contact 8 of this selector is closed. relay M is energized by a circuit which passes from battery 16; through wires 79, 8-1, 82 and 119, contact 8 of selector F winding 131 of this selector. wire 132, winding of relay M wires 87 and soon as relay M" closes, a stick circuit for this relay is closed, which circuit .passes from battery 16, through wires 79 and 81, back point of contact 20 of relay M wire 133, contact 13 1 of relay M wire 135, winding of relay M then through 87, 88. 17 and i 89 to battery 16. Contact 21 of relay M closes a circuit for lamp L, which circuit is from transformer U, through wire 90, lamp L, wire 136, contact 21 of relay M and wires 137 and 92 to transformer U. When relay M closes, the stick circuit for relay M is opened at back contact 18. so that the latter relay becomes rte-energized and lamp L becomes extinguished. 'hen the train passes signal S relay M becomes energized, as explained hercinbcfore, thereby causing lamp L to become lighted. Relay M remains closed until the despatcher closes his key R or another calling key has been operated. The closing of relay M also opens at the back point of contact 20 the stick circuit for relay M" so that lamp L becomes extinguished.

Assuming that relay M has been energized by a train passing signal St, the despatcher can dcenergize this relay at will by opening key 17, thereby opening the holding circuit for relay M. Relays M and M can be tie-energized at will in th same manner.

88, key 1.7, and wire 89 to battery 16. As'

The function of the thermal circuit controller Q, is as follows: As will be apparent from Fig. 1-, each time that the telegrapl'i relay 7 of. the transmitting device P is closed, it causes a momentary connection across the line wires 28 and 29 through battery 7 6 and contact 117 of relay D. If the code wheel contact 169 or the'telegraph line relay 7 should stick in the closed position, this short circuit would. tie up the apparatus in so far as concerns the control of the signals from the despatehers otiice and the indication of signal operation in the despatchers otiice. To avoid this difficulty we have provided the thermal circuit controller Q. The normally closed contact 5, as pointed out hereinbefore, is included in the holding circuit for the indication stick relay D. The circuit for the winding of the device Q is from a battery 138, through wire 139, contact 140 of relay D wire 141, winding 142 of circuit controller Q, wire 143, contact 144 oi telegraph relay 7, and wire 145 to battery 138. During the normal operation of the transmitting device P contact 1 1 1 is closed intermittently for short intervals, but these intervals are .not sullicient to heat the device Q, to such point that contact 5 will open. It. however, contact 169 or the telegraph relay 7 should stick in the closed position, contact 144 will remain closed, and after a given in terval of time circuit controller Q will become heated to a sufficient degree to open contact 5 This will open relay .1) and so will disconnectthe transmitting apparatus P from line wire 28. The rest of the apparatus will then function in the proper manner, but the transmitting device P will. of course, remain out of commission until the difiiculty is removed.

Referring now to Figs. 2, 3, at and 5, we have here shown one form of apparatus which may be applied to each signalS to control the associated code wheel (3 and contact at. This apparatus comprises a? shaft lli'which is biased by a coiled spring 14% to occupythe position inwhich it is shown in Fig. 2, but which is provided with an arm 1&5) whereby it mhe turned in clockwise direction in oppos tion to the force exerted by the spring. The arm 149 co-operates with a rod 150 which is connected with the Semaphore' 151 of signal S andWv-hich is constrained to'move in a substantially vertical direction. The co-action 0t rod 150 and arm 1 19 is as follows: YVhen the signal is at stop the arm is substantially horizontal'with the upper end of the rod directly underthe arm; when the signal moves to the caution position the rod swings the arm and shaft in clockwise direction through substantially and as. the signal continues to the proceed position the rod merely slides past'the arm without causing any further movement of the latter. Vthen the signal returns to.

iii

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the caution position it of course has no effect on the arm i l-land shaft 147, but. when the signal returns. to the stop position these parts are restored to their normal position by spring 14-6.

Attached. to the inner end of shaft 147 is aratch'et 152 which co-operates with a pawl 153011 'a {rear wheel 15% which gear wheel is otherwise free'to rotate with respect to the shaft. 'The arrangement of the pawl and ratchet is such that when the shaft is swungin clockwise direction by the signal, the gear wheel does not revolve, but that this gear wheel is positively connected with the shaft when the latter returns under the influence of spring 148. Meshing with gear wheel 154 is a small gear 155 fixed to a shaft 156 which carries the code wheel 6. The ratio of these two gears is such that the code wheel makes one complete revolution while the shaft 14'? i is making its usual 90 movement from they vertical to the horizontal position of arm 149. The code wheel co-operates with the contact 169 in the usual and well known manner, so

' that this contact is closed by eachtooth on.

the wheel.

The speed of operation of the code wheel by spring 148 is limited by a centrifugal speed governor 159 which is operatively connected with code wheel shaft 156 through the medium of gears 160.

In order-to stop the code wheel 6 at the proper place, the shaft 147 carries a Z shaped pawl 161 which co-operates with a pin 162 fixed in the code wheel. WVhen the shaft is swung in clockwise direction by the signal, the pawl moves downwardly out of. the path of the pin, so that the code wheel can revolve when the parts. are released, but.

as the shaft approaches its normal or biased position this pawl returns to its position in the path of the pin and so arrests the moving parts just as the operation of the code wheel is completed.

The auxiliary contact 4 is normally closed, but is momentarily opened by the pin 162 on code wheel 6 just before this wheel comes to rest, that is, when the signal has reached the stop position. I

As shown in Fi g. 5 the code wheel 6 makes only one revolution while the signal is movin from the caution to the stop position.

but if desired the code wheel may be caused to make two or more revolutions during such movement of the signal, so that the impulse combination transmitted bythis wheel will be impressed on the line two or more times in succession, thereby increasing the probability of the successful response of the corrc sponding selector in the despatchers oiiice. This may be accomplished by adding a gear wheel 1700and pinion 171 between wheel 154 and pinion' 155 as shown in Fig. 6.

Referring-now to Figs. 7, 8 and 9, we have here illustrated one form of themal. circuit to binding posts 166 and 166*.

The terminals of this winding are attached Also mounted on the base 163 is a yoke 167 carrying an adjustable screw 168 which, with the element 16%, constitutes the contact 5 of the circuit controller. At normaltemperature this contact is closed, but when the element 16% is heated due to prolonged supply of current to winding 165, this element bends downwardly out of engagement with the screw 168 so that contact 5 is then open,

Although wehave herein shown and described only one system embodying our invention, and only a few forms of apparatus for use in such system, 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 our invention.

Having thus described our invention, what we claimis:

1. In combination. a series of railway' contact which is closed when the operating 1 winding receives the impulse combination to which the selector responds; a circuit including said contact and said auxiliary winding and a repeater relay, a stickrelay, a pick-up circuit for said stick relay controlled by said repeater relay, a holding circuit for said stick relay controlled by a contact operated by said signal, an indicat ing device. and a circuit for said device controlled by said signal and by said stick relay and by said selector contact.

3. In combination, a railway'signal, two selectors associated therewith and selectively responsive to two different impulse combinations, moans controlled by said selectors for placing said signal at stop or proceed. and means including two code keys under the control of a despatcher at a distant point for transmitting saidtwo impulse combina tions to said selectors.-

4. In combination, a railway signal, a stick relay, means controlled by said relay when energized for causing a change in the indication given by said signal, means includinga selector at the signal and a code key at a distantv point for closing said relay, and means for subsequently keeping said relay closed until the change of indication of said signal has been accomplished.

5. In combination, a railway signal, a stick relay, means controlled by said relay when energized for causing a change in @the indication given by said signal, means ill eluding a selector ah the signal and a code key at a distant point for closing said relay, means for subse uentlykeeping said relay closed until the c ange indication of said signal has been accomplished, and means controlled by said relay when closed for giving positive information at said distant, point of the indication given by said signal.

6. In combination, a railway signal, a code key associated therewith, means responsive to a change in the indication given by said signal for causing operation oi said code key, a selector located at a distant point and responsive to the impulse combination transmitted by said code key. and indicating means controlled by said selector.

7. In combination, a railway signal, a stick relay associated therewith, means in: eluding a selector at the signal and a code key at a distant point for closing said relay,

' means for subsequently keeping said relay closed until said signal changesto the stop indication, and means controlled by said relay when closed for giving a. positive indication at said distant point if said signal is giving a proceed indication.

8. In combination, a railway signal, a s ck relay associated therewith, means inc. cling a selector at the signal and acode key eta distant point for closing said relay,

means for subsequently keeping said relay closed until said signal changes to the stop indication, and means controlled ointly by said relay and by said selector and effective while the relay is closed and the selector has responded to operation of said code key. to give a positive indication at said distant point if said signal is in a proceed condition 9. In combination, a railway signal, a stick relay associated therewith, means including" a selector at the signal and a code key at a distant point for closing said relay, means for subsequently keeping said relay closed until said signal changes to the stop ind cation, and means effective if said relay is closed to give an indication at said distant point when said signal changes to the stop condition.

10. In combination, a railway signal. a stick relay associated therewith, means including a selector at the signal and a code key at a distant point for closng said relay, means for subsequently keeping said relay closed pntil said signal changes to the stop indication, and means including a vibrating device at said signal and a telephone receiver at Said distant point and operating eeoneo when said relay is closed to give a positive indication, a vibrating device adjacent said signal, means for operating said device when said relay is closed and the signal is at proceed, and means including a telephone receiver at said distant point for detecting operation of said device.

12. In combination, a railway signal, a slick relay associated therewith, means including a selector at the signal and a code key at a distant point for closing said relay, means for subsequently keeping said relay closed until said signal changes to the stop indication, a vibrating device adjacent said signal, means for operating said device after said relay closes and said selector has re sponded to its code key provided said signal is at proceed, and means for detecting operation of said vibrating device at said distant point.

13. In combination, a railway signal, a stick relay associated therewith, means including a selector at the signal and a code key at a distantpoint for closing said relay, means for subsequently keeping said relay closed until said signal changes to the stop indicatiomand means including a code key operated by said signal and a selector at said distant point for indicating when said signal changes to the stop cond tion if said relay is closed at such time.

l t'ln combination, a railway signal, a. stick relay associated therewith, means in cluding a selector at the signal and a code key at a distant point for closing said relay, means for subsequently keeping said relay closed until said signal changes to the stop indication. a selector at said distant point, means including a. code key actuated by said signal and operating when the signal moves to the stop position if said relay is closed to transmit to said second selector the impulse combiuation to which it responds. and indicating means controlled by said second selector.

15. In combination, a-railway signal, a stick relay associal'hd therewith, means including a selector atthe sgnal and a code key at a distant point fer closing said relay. means for subsequently keeping said relay closed until said signal changes to the stop indication, a selector at said distant point,

means including a code key actuated by said signal and operating When the signal moves to the stop position if said relay is closed to transmit to said second selector the imnilse combination to which it res onds. a

lamp at said distant point, and means for lighting said lamp when the selector at said point receives the impulse combination to which it responds.

lt iln combination. a railway signal. a selector associated therewith, and including a contact which becomes closed when the selector receives the impulsecombination to which it responds, means including a code key at a distant point for transmitting said impulse=combination to said selector. and. means controlled jointly by said selector and said signal and operating it the signal is at proceed while the selector contact is closed to give a positive indicat'on at said distantpoint.

17. In combination. a railway signal. a selector associated therewith. and including a contact which becomes closed when the 'selector receives the impulse combination to which it responds, means including a code key at a distant point for transn'iitting said impulse combination to said selector. a vibrating device associated with said signal,

means for operating said device while said selector contact is closed it said signal then indicates proceed, and means including a telephone receiver at said distantpo'nt fo detecting operation of said vibrating device.

18. In combination, a railway signal. a code key actuated by said signal for transmitting an impulse combination. and indicating means for said signal including a selector at a distant point responsive to the impulse combination transmitted by said code kev.

ill

, 19. In combination, a. railway signal. a code key actuated by said signal for transmitting an impulse combination, a selector located at a distant point and responsive to the impulse combination transmitted by said code key. a lamp 'atsaid distant point. and means for lighting said lamp when said selector receives the impulsecombination to which it responds.

20. In combination a railway signal. a code key actuated by'said signal for transmitting an impulse combination. a selector located at a. distant point and responsive to the impulse combination transmitted by said.

code key. a lamp at said distant point. means for lighting said lamp when said selector receives the impulse combination to which it responds, means for subsequently keeping said lamp lighted. and manually operable means for eiitinguishing said lamp.

21. In combination, a railway signal. a transmission line extending from said signal to a distant. point, a code key actuated by said signal for impressing an impulse'coinbination on said line. and indicating 'means at said distant point including a selector connected with said transmission line and responsive to the impulse combination delivered by said code key.

22. In combination. a railway signal. a code key associated therewith, means responsive to a change in the indication given by said signal for causing operation of said code key. a selector located at a. distant point and responsive to the impulse combination transmitted by said code key. a lamp. and

means for lighting said lamp when said FC- lcctor receives the impulse combination to which it responds.

23. In combination, a railway signal, two selectors associated therewith. and responsiv to two different impulse combinations means including two code keys located at a distant point for transmitting said impulse combinations to said selectors. a relay, means for closing said relay when one selector responds to its impulse combination. means for subscquently keeping said relay clo'ed, means for placing said signal at stop when said relay is closed. and means for opening said relay when the other selector responds to its impulse combination. i

In combination, a railway signal. two selectors associated therewith and responsive to two difierent impulse combinations, means including two code keys lo' ated at a distant point tor transn'iitting said impulse combinations to said selectors. and means operating to place said signal at stop when said two selectors respond successively to their respective impulse COIIlblIltltlOllS.

25. In combinatiom a railway signal. two selectors associated therewith and responsive to two difl'crcnt impulse combinations, means including two code keys located at a distant point for transmitting said impulse combi- 'nationsto said selectors. a repeating relay for each selector. means for closing each re-. peating relay when the corresponding selector responds to itsimpulse con'ibination, a stick relay for each re 'ieating relay. a pick-up circuit for the ti st stick relay con trolled by a. frontnontact of the associated repeating relay, a holding circuit for said first stick relay. a pick-up circuit for the second stick relay controlled by a trout eon tact of the associated repeating relay and a front contact of the first stick relay. a holding circuit for the second stick relay controlled by a back contact of the first repeating relay, and an operatingcircuit 't'or said signal controlled by second stick relay.

26. In combination. a railway signal. two selectors associated therewith and responsive to two ditiercnt impulse combinations. means including two code keys located' at a distant. point for transmitting said impulse comhh nations to said selectors. means operated by the successive response of said two selectors, for placing said signal at stop. and means operated by the subsequent response of one of said selectors for restoring said signal to proceed.

27. In combination. a railway signal, a code key associated therewith. means responlit),

lthl

Ian

said signal for causing operation of said code key, a selector located at a distant point and responsive to the impulse combination transmitted by said code key, a lamp, means for lighting said lamp when said selector receives the impulse combination to which it responds, and means for subsequently keeping said lamp lighted.

28. In combination. a series of railway signals, a transmission line extending from said signals to a distant point, a code key associated with each signal, for impressing a distinctive impulse combination on said transmission line, '11 series of selectors located at said .distant point and receiving impulses from said transmission line and each selectively responsive to the' impulse combination of one of saidcode keys, and indication means controlled by said selectors. 29. In combination, a series of railway signals. apparatus foreach' signal including a code key operated by the signal for transmitting a distinctive impulse combination. a series of selectors, located at a central point and responding to said distinctive impulse combinations respectively, and means controlled by sa d selectors for indicating operation of said signals.

30. In combination, a series of railway signals, apparatus for each signal including a code key operated by the signal for transmitting a distinctive impulse combination, a series of selectors located at a central point and responding to said distinctive impulse combinations respectively, a relay associated with each selector, means controlled by each selector when operated by its distinctive impulse combination for closing the associated relay, and an indication device controlled by each relay.

31. In combination, a series of railway signals. apparatus for each signal including a code key operated by the signal for transmitting a distinctive impulse combination, a series otselectors located at a central point and responding to said distinctive impulse cinnl iinations respectively, a relay associated with each selector, a pick-up circuit for each relay closed when the asso'ciated selectorresponds to its distinctive impulse combination. a holding circuit for each relay except the last in the series controlled by a back contact of the next relay in the series, and indication devices controlled by said relays.

32. In combination, a series of railway signals. apparatus for each signal including a code key operated by the signal for transmittin; a distinctive impulse combination, a series of selectors located at a central point and responding to said distinctive i1npulse combinations respectively, a relay associated with each selector, a pick-up circuit for each relay closed when the associated selector responds to its distinctive impulse combination, a holding circuit for each relay point and responding to said distinctive im- 1 pulse combinations respectively, a relay as Sociated with each selector, means for closing each relay when the associated selectoLresponds and for keeping it closed until the next relay closes, and indication devices controlled by said relays.

In combination, a series of railway signals, apparatus for each signal including a code key operated by the signal for transmitting a distinctive impulse combination, a series of selectors located at a central point and responding to said distinctive impulse combinations respectively, indication lamps associated with said selectors, and means for lighting each lamp upon the response of the associated selector and for keeping it lighted until the next selector in the series responds.

In combination, a series of railway signals, apparatus for each signal including a code key operated bythe signal for transi mitting a distinctive impulse combination, a series of selectors located at a central. point and responding to said distinctive impulse combinations respectively, indication devices associated with said selectors, and

means for operating each device upon the response ofthe associated selector and for continuing the operation of such device until the response of the next selector in the series.

36. In combination, a series of railway slgnals, apparatus for each signal including a code key operated by the signal for trans mitting a distinctive impulse combination, a series of selectors located at a central point and responding to said distinctive impulse combinations respectively, and means under the control of an operator at said central point for connecting the transmitting apparatus of any one or more of said signals with said selectors.

37. In combination, a series of railway sig nals, apparatus for each signal including a code key operated by the signal for transmitting a distinctive impulse combination, a series of selectors located at a central point and responding to said distinctive impulse combinations respectively, and means comprising code keys at said central point and selectors at said signals for connecting the transmitting apparatus of any one or more of the signals with said first-mentioned selectors.

38. In combination, a series of railway signals, a dcspatchcfs ollice a transmission line extending from said cc to said signals, a selector atq'ach signal connected with said transmission linc means in said olllce tor impressing impulse combinations on said line and including a code key corresponding to each signal selector, a relay at each signal, means tor closing eaclrrelay when the corresponding selector responds to its impulse combination and for subsequently keeping the relay closed until the associated signal moves to the stop position, means for each signal including a code key operated by the signal for impre sing a distinctive impulse combination on said line when the associated relay is closed, selectors in said, o'lfice connected withsaid line and individually responsive to the impulse combinations transmitted from said signals, and indicating means in said olhce controlled by said ollice selectors.

39. In combination. a series ot-railway signals a despatchers ollice. a transmission line extending from said ollice to said sig nals, a selector at each signal connected with said transmission line, means in said ollice tor impressing impulse combinations on said line and including a code key corresponding to each signal selector. a relay at each signal, means for closing each relay when the corresponding selector responds to its impulse con'ibination and for subsequently keeping the relay closed until the associated signal moves to the stop position, a second selector at each signal and also connected with said line,v additional code keys in said ollice corresponding to said second signal selector, and means associated with each signal for placing the signal at stop when the first and second associated selectors are operated in sequence by their respective combinations.

40. In combination. a rail ay trallic controlling device, a transmission line. appa ratus associated with said device for impressing an impulse combination on said line, and means for disconnecting said apparatus from said line it the apparatus should stick in such conditions as to form an electrical connection across he line.

ll. Incombination. a railway trafiie controlling? device, a transmission line. apparatus associated with said device tor impressing an impulse combination on said line, and means including a thermal circuit controller for disconnecting said apparatus from said line if the apparatus should stick in such condition as toliorm an electrical connection across the line.

4-2. In combination. a railway trallic conlrolling device. a transmission line. appz1- ratus associated with said novice for impressing an iiupulsc combination on said line. a relay for connecting said apparatus with said line when the relay is energized, and

means for de-energizing said relay it the apparatus should stick in such condition as to forman electrical connection across the line.

43. In combination, a railway traflic corn trolling device. a transmission line, apparatus associated with said device for impress ing an impulse combination on said line, said apparatus including a source of current and an intermittently closing contact, a relay arranged when energized to connect said opparatus with said line, a circuit for said relay including a normally closed contact of a thermal circuit controller,.and a circuit for the winding of said circuit controller includ ing a second intermittentlyclosing contact operated in unison with the first contact.

44. In combination, a" railway trallic controlling device. a transmission line, appa-' ratus associated with said device for impressing an impulse combination on said line, said apparatus including a source of current and an intermittently closing contact, a relay arranged when energized to connect said apparatus with said line, and means inclbding a second intermittently closing contact operating in unison with the first said contact for (lo-energizing said relay it said contacts remain closed for more than a given length of time.

45. In combination, a railway trallic controlling device. a transmission line. apparatus associated with said device for impressing an impulse combination on said line, said apparatus iucluding'a source of current and an intermittently closing contact. and means associated with said apparatus for disconnecting the apparatus from said line it said contact remains closed for more than a given length of time.

46. In combination, a railway signal. a selector having a normally open contact which b comes closed when the selector receives the impulse combination to 'ivhich it responds, and remains closed until the selector subsequently receives an impulse, a stick relay. means including said selector contact for closing said stick relay, means for subsequently keeping said relay closed until said signal changes to the stopindi; cation, and means controlled by said relay and by said selector contact for giving an indication at a distant poiut if said signal indicates proceed.

47. In combination. arailway signal a selector having a normally open contact which becomes closed when the selector receives the impulse combination to which it responds. and remains closed until the selector subsequently receives an impulse. a stick relay. means including said selcctor contact for closing said stick relay, means controlled by said signal for subsequently keeping said rclay closed. and means con trolled by said relay and by said selector contact for giving an indication at a distant point of the condition of said signal.

48. In combination, a railway signal, a selector having a normally open contact which'becomes closed when the elector receives the impulse combination to which it responds, and remains closed until' the selector subsequently receives an impulse, a stick relay, means including said selector contact for closing said stick relay, means controlled by said signal for subsequently keeping said relay closed, and indication apparatus controlled by said relay and said signal and said selector contact.

49. In combination, a railway signal, a selector having a normally open contact which becomes closed when the selector receives the impulse combination to which it responds, and remains closed until the selector subsequently receives an impulse, a stick relay, means including said selector contact for closing said stick relay, means for subsequently keeping said relay closed until said signal changes to the stop indication, means operating when said relay and said selector contact are closed to ive an indication at a distant point while said signal is giving a proeeedjnrlication, and means controlled by said relay for giving an indication at said distant point when said signal changes to stop.

50. In combination, a transmission line, a plurality of selectors connected with said line and responsive to diiferent impulse ccmbinations, each selector including a normally open contact which is closed when the selector receives the impulse combination to which it responds, and remains closed until another impulse is impressed on said line, railway signals, and indication means for said signals controlled by said select-or contacts.

51. In combination, a transmission line, a plurality of selectors connected with said line and responsive to diflerentimpulse combinations, each selector including a normally open contact' which is closed when the selector receives the impulse combination to which it responds, and remains closed until another impulse is impressed on said line, railway signals, a stick relay for each selector, means for'each stick relay including the contact of the associated selector for closing the relay, holding circuits for said relays controlled by said signals, indication means for said signals controlled jointly by said relays and said selector contacts, and other indication means for said signals controlled by said relays but not by said selector contacts.

52. In combination, a railway signal, a selector having a normally open contact which becomes closed when thc selector rcceives the impulse combination to which it responds, and remains closel until the selector subsequently receives an impulse, a stick relay, means including said selector contact for closing said stick relay, means controlled by said signal for subsequently keeping said relay closed, indication appa- T ratus for said signal controlled jointly by said relay and said selector contact, and other indication apparatus for said signal controlled by said relay but not by said selector contact.

53. In combination, a railway signal, a dcspatchers station, a transmission line extending from said signal to said station, a selector at the signal having its operating winding connected with said line, said selcctor having an auxiliary Winding in inductive relative to said operating winding, means at said station for impressing on said line the impulse combination to which said selector responds; a circuit including said auxiliary winding, the selector contact, means for supplying periodic current, and a contact controlled by said signal; and a telephone receiver connected with said line at the despntchers station.

54. In combination, a transmission line, a selector having its operating winding connected with said line and-having an auxili ary Winding in inductive relation to said operating winding, means for impressing on said line the impulse combination to which said selector responds, a circuit including said auxiliary winding and controlled by the selector contact, means for supplying a periodic current to said circuit, a railway lrallic controlling device for controlling said. circuit, and a receiving device connected with said line for detecting the alternating current impressed on the line by said operating wiudingduc to periodic current in Said auxiliary winding.

55. in combination, a transmission line, a scllu'ior' having its operating Winding cennectcd with said line and havin an auxiliary winding in inductive relation to said operating winding, means for impressing on said line the impulse combination to which said selector responds, a circuit controlled by the contact of said selector and including said auxiliary Winding means for supplying periodic currentto said circuit,

ill?) a railway signal, a contact operated by said signal for conlrollin; said circuit, and a rewiring device conneclcd with said line for dorm-ling the alternating current impressed on the line by said operatingwinding due (0 periodic current in said auxiliary winding.

In combination, a transmission line, a selector having its operating Winding connected with said line and having an auxiliary winding'in inductive relation to said operating, winding, means,- for imprcsslng on said line the impulse combination to which said selector responds, a railway signee'eeeo nal, and means controlled by the contact of said selector and including the two windings thereon-for giving an indication at. a

distant point through said transmission line oi the condition of said signal.

57. in combination, railway signal, it selector having e normally open contact which becomes closed when the selector roceives the impulse combination to which it responds, said selector also having an ziuxiliary winding in inductive relation to its operating winding, and indication apparatus assocated with said signal and including said auxiliary winding.

58. In combination, a transmission line, two selectors having their operating windings connected with said line and responsive to (litl'erent impulse combinations and each having an auxiliary winding in inductive ELE- relat-ion to its operating Winding, means for impressing on said line the impulse combina tions to which said selectors respond, e cir cuit for thenuXilia-ry winding of each selector and controlled by the contact of the some selector, means for supplying periodic current to each of said circuits, a railway signal, means controlled by said signal for closing one of said circuits or the other eecording as said signal gives one indication or another, and a receiving device connected with said line for detecting the alternating current impressed on the line by the opernting windings of said selectors due to the periodic current 111 said auxiliary windings. In test mony whereof We efiix ours1gnetures,

DANIEL W. RICHARDS. HARRY P. HANCOCK,

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