US1079309A - Signal-box. - Google Patents

Description

G. E. BEACH &.H. W. DOUGHTY SIGNAL BOX. APPLICATION FILED MAY 25,1911.

1,@79,309, Patented Nov. 18, 1913. 2 SHEETS-SEEET 1.

0-. E; BEACH & H. W. DOUGHTY.

SIGNAL BOX. APPLICATION FILED MAY 25, 1911.

, 'Patentfed' Nov. 1a, 1913 UNITED STATES TENT OFFICE CLARENCE E. BEACH AND HERMAN Vt; DOUGHTY, OF BINGHAMTON, NEW YORK, ASSIGNORS TO GEORGE 0. KNAIP, OF NEW YQRK, N. Y.

SIGNAL-BOX.

- Specification of Letters Patent.

Patented Nov. 18, 1913.

To all whomit may concern Be it known that we, CLAnnx-cn E. Briton and llnnnxN V. :DUUHHTY. citizens of the United States. residing at Binghamton, in the'county of Broome and State of New York, have invented certain new and useful Improvements in Signal-Boxes, of which the following is a specification.

Our invention relates to a signal box for use in fire alarm systen'is ot' the non-interfering type, and has for its object to provide a signaling mechanism an arranged that it shall not be possible tor interference to occur between the transmission. of s' fnals from different boxes. This object we attain by providing the signal box mechanism with a non-interference magnet which both mechanically controls the opera-.tion of the train and electrically controls the transznisdon ot thesignal. The magnet contrcls the operation of the box for a certa n period of time. after which. the train. it it has been permitted to run, continues to rotate. reg.-ir llc:-;:-t of the electrical coi'iditions of the signaling circuit. for an additional period, at-fthe termination of which the transmission of the signal is brougi'it under the control of the magnet. The duration of the additional period above referred to is such that the box, once started. can not .send a signal, until the electrical conditions 01 the signaling circuit are such as to permit such signals to be transmitted without interfering with signals from other boxes.

Referring to the drawings. Figure l is a diagrammatic view showing the box at rest capable of being tripped by the magnet as soon as it is energized; Fig. 2 shows the box after the train has been started snowing the ctl'ect ci a break in the external circuit during the no control period oi the box; Fig. 3 shows the magi et in electrical control of the box during the first. closure; Fig. 1 shows the etl'e t ot a break in the external circuit during the first (hit-11111; Fig. :"ris a detail to be later described; and Fig. (3 isa plan view of the signal wheel. pens and tracer. Figs. 7, 8. and 9 are diagrams to be explained later.

Referring to Fig. 1. the externa or signaling circuit is connected to the box and to the bindii'ig posts A, B. A non-interterencc magnet 3has an armature 4 to which is secured the armature lever 18 pivoted at. 28. A retracting spring'31 and stop-pin 32 c ntrol the backward movement of thegrmature lever. The lever 18 has an arm 19 for a purpose to be later described, and a pin 5 located on the back of the lever, and carries at its end a pivoted tracer 21 provided with a spring 26 mounted as shown in Fig. 6. Signaling pens 23, 2-1 serve to make and break the signaling circuit when operated by the teeth 22 and notches 95 of a wheel 44 rotated by the usual spring-driven clock train, the escapement of which provided with a detent 1(. This detentis controlled by anarm 15 mounted on the end of a lever 17 which is in turn mounted on a pivot. (i, the arm 15 being'itselt mounted on a pivot 26 and having a laterally projecting arm 27 engaging the bottom the lever17 with which it is normally held in engagement by a spring 3 1-. The lever 17 at its left hand end engages the pin 5 on the armature lever 1.1 The pivot 6 is carried. by one arm 13 ot a curved lever which is pivoted at the other arm 11 of said lever having attached thereto a retracting spring 8 and carrying a contact 5). The arm 13 has at its upper side a. ledge 2 having a notch 20. lVith this ledge Q enga es a pin l'carried on the armof a wheel 30 mounted on the shut't I}. The contact. 't) cooperates with a contact 10 on a spring arm 101 secured to an insulating block 31. The spring arm 1t? has a contact 12 arranged to cotiperate with a contact 11 also carried by the block 37. The signal wheel 44 is at its rim provided with an overhanging tlange EBtB which is cut. away at the notches in the manner shown in Fig. 1 and Fig. (l.

The signaling circuit is as follows :--The binding post A, wire l). magnet: 3, wire i pen E323. pen 31, wire 1. binding post 13.

A shunt circuit, which for convenience may be termed the pen shunt is as, follows linding post A. wire I). magnet 3, wire F. wire C, contacts 9. 10. arm 101, wire ll, binding posts B. A second shunt. which may tor convenience be termed the-box shunt is provided in which no. circuit is as follows :---lost A. wire G, contact 1l,con tact 12. part of spring arm 1'01. II, post B. p

modified form of signal wheel is shown in Fig. the teeth 220 of thewheel 4-H) having overhanging flanges 22] to engage the tracer 21. In this arrangement the circuit remains closed between strokes. The first 1 5 breaking circuit between 9, '10.

' magnet 13 tact l0, arm 101, wire H, binding post B),

'and'the box shunt 11, 12, has been opened. The magnet 3 draws up its armature untll tracer 21 strikes the top of flange 36, thus preventing arm 19 from. engaging 101 and Pin 5 on f lever 18 hashowever caused lever 17 to raise its right-hand end and arni out of engagement with detent 16, so that the train can run Pin 1 then moves across the face of ledge 2, until it drops into notch 20, thus permitting arm 13 torise, carrying the free ,end of -15 up to a point where it can no longer be brought into engagement with detent 16 even it armature 1 is released (sec Fig. 2, which shows the armature released) the left-hand end oil 1 dropping, but not far enough to opencircuit at 9, 10. The armature is thus in mechanical control 01 the box as long as pin 1 is moving over the top of ledge 2, but loses control, though still attrzwtcd, as soon as pin 1 drops into notch 20, because of the arm 15 havingbeen put into an inoperative position-by the raising of its pivot. During the time that pin 1. is

passing over ledge 2, tracer 21 is over flange 3'6, but the parts are so timed that before pin 1 drops off notch 20, pen. 23 has reached the first. notch in wheel 14 and closes 2 21, thus providing a current path from post A through magnet Ii to post B without passing llilOllfll shunt. contacts 9,10. The tracer 2-1, in'nnediuicly after the circuit has been closed at 23, 24, drops into the first notch. 25, .per- Initting the armature to be fully attracted and its arm 15) to engage 101 and to raise contact 10 from contact 5 'lhereupon the pin 1 drops oll not'cl 20, the left-hand arm ll lowering under the tension 01' the spring h an the rin'hl-lmnd arm li-i rising and rais ing pivot t3 ol' arm 17 to the position shown in Fig 3). The armature now in. control and itlhc circuit is int'erruptwl while tracer 21 is opposite notch 25, the armature 4: will fall away lrom $1, withdrawingarm 15) and permitting 11, 12 to close (Fig. 4) thereby shunting; pens 23, 24 and also the magnet 3, after which the opening and clo ing of 23, 24 does not atl'oct current between A and 13, and current between A and B cannot aiiect until wheel Z50 has in its rotation brought pin 1 against the curved side of .ledgc 2, forcing it down into the position shown in Fig. 1, whereupon it the line still open, dcl'ent 15 engages 16 and stops the ';5 train, having previously, by upward move-- ment of arm 1i, rei stablishcd connection at E 10, and broken the box shunt at 1.1, 12. When current is recstablishcd armature 4 is attracted, trace- 21 drops on top of flange 36 preventing 19 from engaging 101 but pen mitting 17 to raise 15 away from 16, the operation being the same as before described upon starting the box. As the train rotates, flange 36 beyond the first notch 25 passes above tracer 21 just before engagement of the right-hand side of notch 25 raises pen 23 to break 23 21 so that armature 4 cannot fall back it will be noted that whenever pen 23 has fallen into a notch, such notch will be opposite tracer 21, thus permitting the armature to fall. away from the magnet if not supported by the magnet, but just before pen 23 is lifted each time from pen 2 1, thenotch in the flange 3G ends and said flange prevents tracer 21 and parts moving therewith vfrom moving, to a position where pin. 19 would permit 11 and 12 to engage and thus shunt the box. During the sending of its own signahtherefore, the closed circuit keeps the arn'iature attracted in the intervals oi. closure, and the flange and tracer niechanically hold the armature lever in the intervals of broken circuit.

The box when started is for a short period of time under the control of the magnet, so that if the external circuit is broken during this period, the box does not continue to run. This mechanical magnetcontrol is then disabled, but the electrical or circuit .magnet-control is, after a short period in which there is no control, established sons to shunt the box in case of intm'lerenee caused by other boxes breaking the circuit, and to provide for the sending: of a signal when such interference is absent.

hen the box is started and the pin 1 is passing over the top of the ridge 2, the running of the box will be under the control of the armature, the train starting when the armature attracted and has thereby raised the detent 15, and stopping when the armature retracted and thereby releases said detent. This period of armature control of the train, we shall refer to as the mechanical magnet control period. \Vhen the pin 1 reaches the lower part 20 of the ridge 2, lever 13 swings and carries detcnt 15 to an inoperative )o:- ition so that while the tooth 20 is being passed over, the :n-nmture will be powerless to stop the train. This period, when the tooth 20 is ell cetive, we shall refer to as the no control period. During the mechanical magnet control period and,

that no control period, contacts 5) and 10 remain in engagement to keep the pen shunt closed. .llowever, when the pin 1 reaches the end of the ridge on lever 13, this lever will swing fartherand will release contact 1G and thereby open the pen Slllllll/J, but at substantially th same time thctracr breaks in the si Mon-armature lever 18 comes opposite the first notch and the armature can become fully attracted to carry its end 19 upwardly to prevent engagement of contact 12 with contact 11 and thereby The electrical magnet control period now start-s, then continues until the signal contacts break for the first time. During this electrical magnet control period, the armature is free to retract should the line be open at any external point so that upon such opening, the contactsl2 and 11 may come into engagement to close the'box shunt, and to thereby prevent further attraction of the armature until this box shunt is again opened just before the beginning of the next round by the lever 13.

The period during which the box runs subsequent to the termination of the period of mechanical magnet-cmitrol and previous to the start of the period of electrical magnet-control must hear such relation to the sequence of breaks and closures in the signals from other boxes that if any closure in such signals has energized the magnet 3 and thereby released this box the electrical magnetrontrol period will occur during sonic open circuit period following the closed circuit period which first energized n'iagnet 3. The period which elapses from the termination of the mechanical control till the beginning of the electrical control may be shorter than any open circuit period in a signal, or such period may be longer than any OPGIrCiI'CUliZ period in a signal provided that such period ends after the box has run for a time greater than one or more tweaks and closures, and that such no-control period ends at a time such that the circait is open during all or some part ol the 'period of electrical control. Thus it a signal from box 54, consisting oi live closed and open periods, the fit'th open period being longer than the preceding open periods, and then four closed and open periods, the fourth open period being longer than the period bet ween the tire closures and the tour closures, was in course of transmission over a circuit, at a time when the box mechanism as shown in Fig. 1 was placed in control ol such circuit, the fir.-t closure which occurred .in such signal after the box w: 2 placed in control would energize the magnet 3, thertiiby attracting the armal ure '4- and witlulrawingr 15 from lo, and allowing the rotation ofl whe l 44. it now, the magnet. was so energizel by the first closure in the group of five, a d the rotation of wheel 44. is so timed tha tracer 21 is opposite first notch durin any part of any of the nal, itvis evident that the magnet 3 will pe unit the armature 4: to assume such position that contacts 11, 12, Will be permitted to close and shunt the magnet keep the box shunt open, provided the magnet 18 energized.-

3 and pens 23, 24. It isalso evident that had the mechanical control during the rotation of wheel 4% continued until the electri- *al control was established the movement of wheel 44 would have been arrested during any break or breaks occurring in the transmission of signal 54 subsequent to the closure which first energized magnet 33, and wheel would be again pern'iitted to rotate during each succeeding closure; and thus the rotation of wheel at might be arrested just prior to the period of electrical control, and in that event, the next succeeding closure from signal 5% would start practically at the same time as 'the commencement of the period oi. electrical control, thereby permitting wheel -l-=l to rotate in synchronism with-the signal from, box 54 and by holding' the circuit open while the portion of said wheel 4.4; between the second and third notches of said wheel as passing under the pen 23 and the tracer 21 was locked beneath flange 30, to interrupt the signal from box 54. But, by permitting the box to run regardless of any breaks which may occur in the circuit from the time the pin 1 discngagcs the ledge 2, until the electrical control isestablished and the first notch is opposite the tracer 21, such notch 25 is presented to tracer 21 after the elapse of such a period of time from the closure which first energized the magnet 3,

that the translnissimi ol' signal 54: will open the circuit while said notch 25 is in the path of tracer 21 regardless'ot which closure in such signal fi-l caused the magnet 33 to be initially energized. it is thus apparent that. the length of the period during which the pin 1. is passing over the notch 20, may lJt 'cinn 'niralively short or comparatively long as long as therclation of such period to the period between a closed circuit in tcrval and a succccdin open circuit interval h be maintained as above specified.

The mechanisms for starting and stopping 110} the box have not been shown,as mechanism l or this purpose is well known in the tiri.

Fig. 7 shop diagrammatically the clo sures and opciiiillg's ol the circuit. during the sending ol the signal t ll. show the durations oi the mei'fhanical magnet control M. and the electrical control 1), relatively to the closures and openings shown in l ig. T, he interval between M and E may be cilhcl' short or long, cach ol' the boxes of the system being so cut with relation to this interval. between the controls that the electrical control is always established at an open-circuitpoint in the signal.

. 1 The tracer 21 is spririg-controlled 111 the manner shown so that in case the circuit breaks at a time when the ilange 36 'ot a tooth 22 would be brought against the tracer 21 by rotation of the Figs. 8 and 5) the signal wheels of wheel 4-4, the tracer can yield without stopping the train. A suitable stop on the arm 18 prevents the tracer 21 from being drawn farther back than the position shown in Fig. 6. We claim:

1. In a signalin rgbox, the combination of a noirinlerfercnce electron'lagnet and armature, a signaling train, means for causing the armature to control the running of the train for a period after starting of the box, means for allowing the signaling train to run inde pendent oi the armature for a period after such armature control period, a disabling circuit closed during said first and second periods to prevent signaling operation, and means for causing said armature to control said disabling circuit for a petiod a'iter said period of independent runningof the train.

2. In a signal box, a magnet, its arma- 0 mice, an armature lever, a signaling train, a

locking lever for said train, a second lever to which said locking lever is pivoted, means on said armature lever for operatively engaging s'aid locking lever, and means connected to the train for operating said second lever independently of said locking lever.

34 In a signalibox, a magnet and an armature structure therefor, a signaling-train, a locking lever for said train, a second lever to 0 which said locking lever is pivoted, means on said armature structure for operatively engaging said locking lever, and means driven by the train for operating said second lever to successively adjust the locking lever 35 to bring the running of the train under its control and to disengage it from such control.

4.. In a signal box, a magnet, its armature, an armature lever, a signaling train, a looking lever for said train, a second lever to 6 which said locking lever is pivoted, means on said armatmi'e lever for opcratively engaging said locking lever, and means con nocted to the train for operating said second lever, said. means comprising a pin on a wheel of said train and a ledge on said sec ond lever.

In a signal box, a magnet, its armature, an armature lever a signaling train, a looking lever for said train, a second lever to which said locking lever is pivoted, means on said armature lever for operatmely en gaging said locking lever, and means eonnccted to the train for operating said second lever, said means comprising a pin on a .whecl of said train and a ledge having a notch on said scrmnd lover.

in a no]rintertcrcncc signal box, the c-im'ihiimliou with a nmgnct and its armature and a signaling train of a switch controlling 5 a. shuntaround the signaling device, a sec-- ond switch controlling a shunt around the magnct and signaling device, and means op crablc by the magnet for controlling both switches and separate i'ncans operable by the 55 train for dircctl i eontrollin both switches.

novasoe T. In a non-interference signal box, the combination with a magnet and its armature and a signaling train of a switch controlling a shunt around the signaling device, a second switch controlling a shunt around the magnet and signaling device, and means controlled bythe train for successively directly operating said switches.

8. In a nonrinterfercncc signal box, the combination with a magnet and its armature and a signaling train of a switch controlling a shunt around the signaling device, a second switch controlling a shunt around the magnet and signaling device, and means controlled by the train for directly operating both switches.

9. In a non-interference signal box, the combination with a magnet and its armature, a signaling train, and a signaling dcvice of a switch controlling a. shunt around the signaling device, a second switch controlling a shunt around the magnet and signaling dcvice and means-connected to the armature for operating bo t-h switches.

10. In. a non-interference signal box, the combination with a magnet and its armature,

a signaling train, and a signaling device of a switch controlling a shunt around the signaling device, a sec nd switch controlling a shunt. around the magnet and gnaling device, an arm carrying one contact of each switch, and separate means controlled by the armature and the train for operating said arm.

11. In a non-interference signal box, the combination with a magnet and its armature, a signaling train, and a signaling device of a switch controlling a shunt around the sig naling device, a second switch controlling a shunt around the magnet and signaling dcvicc, a spring arm carrying one contact. of each switch, and separate moans controlled by the armature and the train for operating said arm.

12. In a signal box, a magnet, an armature, an armature lover, a signal train, locking mechanism tor the train comprising a locking lever for said train, having one arm adapted to engage such train and the other arm engaging the armature lover, and a movable support for such locking lever; means for holding said locking mechanism out of the locking position, and means operated by the train for musing said locking mechanism to move successively into and out of the locking position.

123. in a signal box, a mugugl, an armaturc, an armature lover, a signal train, nal controlling mechanism. a shunt circuit tlmrefor, a shunt switch, locking mechanism for the train comprising a locking lever for said train, having one arm adapted to engage such train and the nth arm engaging the armature lover, and a movable upport for such locking lever: means for holding said locking mechanism out of the locking 2 position, and means operated by the train tor causing said locking mechanism to move successively intoand out f the locking position, said support having .neans for operating the shunt-switch.

14. In a signal box, a non-interference magnet, a circuit-breaking device in series with said magnet and a train for operating the same, a shunt around both the magnet and circuit-breaking device, a second shunt around the circuit-breaking device only,

switches in said shunt circuits, and a common means for first establishing the first shunt and then breaking the second shunt.

15. In a signal box, a non -interference magnet, a circuit-breaking device in series with said magnet and a train for operating the same, a shunt around the magnet and circuit-breaking device, a second shunt around the circuit-breaking device only, switches in said shunt circuits, and means, operated by the train, for establishing the first shunt before the second shunt is broken.

16. In a signal box, a non-interference magnet, a circuit-breaking device in series with said magnet and a train for operating the same, a shunt around both the magnet and circuit-breaking device, a second shunt around the circuit-breaking device only, switches in said shunt circuits, means operated by the train for establishing the first shunt before the second shunt is broken and means controlled by the magnet for operat ing the second shunt switch.

17. A signal box comprising a signaling train including normally inoperative signal transmitting means, a non-interference magnet, a magnet control for the said train,

train-controlled means for disabling the .magnetic control, means for holding the said magnet control and the said signal transmitting means disabled, and switches controlled by the said magnet and the said train controlled. means for controlling the signal transn'iission.

18. A signal box comprising a signaling train including normally inoperative signal transmittingmeans, a non-interference mag not, a mechanical magnet control for the starting period of the said train, tra1ncontrolled means for disabling the said magnet control, means for holding the said magnet control and the said signal transmitting means disabled, and means controlled by the. said magnet and the said train-controlled means during open circuit periods for controlling the operativeness of the said signal transmitting means.

19. A signal box comprising a signaling train, including normally inoperative signal transmitting means, a non-interference magnet, a mechanical magnet control for the starting periods of thesaid train, train-controlled means for disabling the sa d magnet control, means for holding the said magnet control and the said signal transmitting means disabled, means controlled by the said magnet and the said train-controlled -means during open circuit periods for controlling the operativeness of the said signal trans1nitting means, and means for holding the said signal transmitting means in its operative position.

20. A signal box comprising a signaling train, including normally inoperative signal transmitting means, a non-interference magnet, a mechanical magnet control for the starting periodsof the said train, train-controlled mcans for disabling the said magnet control, means for holding the said magnet control and the said signal transmitting means disabled, means controlled by the said magnet and the said train-controlled means during open circuit periods for controlling the operativeness of the said signal transmitting means, means for holding the said'signal transmitting means in its operative position, and means for controlling the re'e'stablishment of the said mechanical control.

21. A signal box comprising a signaling train, including normally inoperative signal transmitting means, a non-interference magnet, a mechanical magnet control for the' starting periodsof the said train, train-controlled means for disabling the said magnet control, means for holding the said magnet control and the said signal transmitting means disabled, means controlled by the said magnet and the said train-controlled means during open circuit periods for controlling the operativeness of the said signal transmitting means, means for holding the said signal transmitting means in its operative position, means for controlling the reestablishment of the said mechanical control, and means for throwing the said controlling means successively into action.

22. A signal box comprising a signaling train including signal transmitting means, a '1 non-interference magnet, a mechanical magnot control for the said train, train-controlled means for disabling the said 'mechanical magnet control but preventing control of the said signal transmitting means, 5 means adapted to be controlled by the said magnet and the said train-controlled means for holding the said mechanical magnet control disabled and for controlling the said signal transmitting means, and means for locking the said signal transmitting means in their operative or inoperative position.

23. In a non-interference signal box, the combination with a normally inoperative signaling device, a magnet and its armature controlling the said shunt-controlling switch subsequent to the operation of the said signaling device controlling means, a second switch controlling a shunt around the magnet and signaling device and means operable by the said magnet and by the said separate train controlled means for controlling the said second switch.

24. In a non-interference signal box, the combination with a normally inoperative signaling device, a magnet and its armature and a signaling train, of a switch controlling a shunt around the signaling device, means controlled by the train for moving the signaling device into operative position, separate means controlled by the train for controllin the said shunt controlling switch, a secon switchcontrolling a shunt around the magnet and signaling device, and means operable by the said magnet and by the said scparate train-controlled means for controlling the said second switch, and means for successively operating said switches.

25. In a signal box, a non-interference magnet, a normally inoperative circuitbreaking device in series with said magnet and a train for ooeratmg the same, a shunt around both the magnet and circuit-breaking device, a secohd shunt around the circu1t-breaking device only, a train-controlled switch adapted to control the said shuntv around the magnet and circuit 'breaking device and to control both of the shunts simultaneously, and a magnetcontrolled switch switch adap controlling the said first shunt.

26. In a signal box, a non-interference magnet, a normally inoperative circuitbreaking device in series with said magnet and a train for operating the same, a shunt around both the magnet and circuit-breaking device adapted to be opened after the circuit-breaking device is placed in operative osition, a second shunt around the circuitreaking device only, a train-controlled switch adapted to control the said shunt around the magnet and circuit-breaking device and to control both of the shunts simultaneously, and aunag'net-controlled switch controlling the said first shunt.

in a signal'box, a non interference magnet, a normally inoperative circuitbreaking device in series with said magnet and'atrain for operating the same, a shunt around both the magnet and circuit-breathin devica a second shunt around the circuit-breakin device only, a train-controlled ed to control the said shunt around the magnet and circuit-breakin device and to control both of the shunts simul taneously, amagnet-controlled switch controlling the said first shunt, and means for establishing the first shunt before thesecond shunt is broken. v

28. In a non-interference signal box, the combination with a normally inoperative signaling device,'av magnet and its armature, and a signaling train, of a switch controlling a shunt around the signaling device, a second switch controlling ashunt around the magnet and signaling device, a mechanical mag net-control for the said train, train-con trolled means for disabling the said rnaguetcontrol but preventing operation of the said switches, and means controlled b the'said magnet and the said train-contro led means for controlling the switches, after the mugnet-control has been disabled.

In a non-interference signal. box, the combination with a normally inoperative signaling device, a magnet and its armature, and a signaling train, of a switch controlling a shunt around the'signaling device, a second switch controlling a shunt around the magnet and signaling device, a mechanical magnet-control. for the said train, train-controlled means for disabling the said ma gnetcontrol but preventing operation of the said switches, means controlled by the said mag: net and the said train-controlled means for controlling the switches, after the magnetcontrol has been disabled, and means for reestablishing the said magnet-control, and restoring the said switches.

30. In a non-interference signalbox, the combination with a normally il'ioperative signaling device, amagnet and its armature, and a signaling train, of a switch controlling a shunt around the signaling device, a second switch'controlling a shunt around the magnet and. signaling device, a mechanical ma 'Il&t--COIltl.0l for the said train, train-controlled means for disabling the said u agnetcontrol but preventing operation of t e said switches, means controlled by the said magnet and the said train-controlled means during o en circuit periods for controlling the switcld s, alter the magnet-control has been disabled, and means for re'e stablishing the said magnet-control and restoring the said switches. j

31'. In a non-intcrference signal box, the combination with a normally inoperative signaling device, a magnet and its armature, and a signaling train, of a switch controlling a shunt around the signaling device, a second switch controlling a shunt around the magnet and signaling device, a mechanical magnctcontrol for the said train, traincontrolled means for disabling the said magnet-control but preventingo eration of the said switches, means control ed b the said magnet and the said train-control ed means during open circuit periods for controlling the switches after the magnetcontrol has. been disabled, and means for locking the switchcontrolling"means.

'32. In anon-interference signal box, the combination with a normally inoperative signaling device, a magnet and its armature,

and a signaling train, of a switch controlling a shunt around the signaling device, :1 secomi switch controlling a, shunt around the magnet and signaling device, magnet-control for the said train, train-controlled means for disabling the said magnet control bnt'pieventing operation of the said switches, means controlled by the said magnet and the said train-controlled means during open circuit periods for controlling the switches after the magnet-control has been disabled, means for locking the switch-cona mechanical.

trolling means, and means for unlocking the switch-controlling means and for restoring the said switches and the said n1agnet-control.

In testimony whereof, we ailix our signatures in presence of two witnesses.

CLARENCE E. BEACH. HERMAN W. DOUGHTY. Witnesses C. M. OONNERTON, M. L. Tnonms.

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