US908189A - Railway-signal. - Google Patents

Description

H. M. ABERNETHY. RAILWAY SIGNAL.

Patented Dec. 29, 1908.

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WITNESSES.

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,H. M. ABERNETHY.

RAIILWAY SIGNAL.

7 SHEETS-SHEET 2 L/j 'gfi.

' 4 m: I aw ATTORNEYS.

Patented Dec. .29, 1908.

m m M D H H w m H u 9 8 m M J i W 8 X Aw h Patented Dec. 29, 1908. 7 SHEETS-SHEET 3.

RAILWAY SIGNAL. APPLICATION FILED MAR. 24, 1906.

H. M. ABERNETHY.

fi ATTORNEYS,

H. M. ABERNETHY. RAILWAY SIGNAL.

APPLICATION FILED MAR. 24, 1906. 908, 1 89.

Patented Dec.29,1908.

7 SHEETS-SHEET 4,

A INVENTOR BY WaQo ai y la; arromvfis,

H. M. ABERNETHY.

RAILWAY SIGNAL.

APPLIOATION FILED MAR. 24, 1906. Y

Patent ed Dec. 29-, 1908.

7 SHEETS-SHEET 6.

H. M. ABERNETHY. RAILWAY SIGNAL.

' APPLICATION FILED MAR. 24, 1906. 908, 189'. Patented Deo.29,1908.

7 sums-sum e.

MIIH WI" Y H. M. ABERNETHY.

Patented Dec. 29, 1908.

'7 SHEBTSSHEET 7.

I WITNESSES." Y INVENTQR @rwa Q Arman Era,

To all whom it may concern; Be it known that I, HARRY M. ABERNETHY,

- UNITED sTA'r s PATENT OFFICE.

HARRY M; ABERNETH Y, OF CLEVELAND, OHIO, ASSIGNOR TO THE AMERICAN RAILWAY SIGNAL COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

RAILWAY-SIGNAL.

a citizen of the United States of America, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Railway-Signals; and I hereby declare the following to be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it make and use the same.

This invention relates to improvements in railway signaling apparatus and especially to electrically operated signals.

Theobjectof this invention is to provide a device of the character indicated which can be used for automatic block signal purposes and also for displaying or operating a signal wherever such a device may be necessary. I

Another object of this invention is to provide a device of this character which can be operated with a minimum expenditure of electric current.

This invention consists in providing a device of this character in which the normal position ofthe signal blade will be the posi tion which indicates danger so that on the failure of the setting mechanism to operate the signal blade will either remain in the danger position or else assume the danger position.

'My invention further consists in providing a device of this character in which the full opera-ting current is onlyutilized when changing the signal fIQl iL danger to distant and from distant to clear and in which the signal blade is mechanically locked in its different positions.

vMyinvention also consistsin the features of'construction and combination of parts as described in the specification, pointed out in the claims and illustrated in the ing drawings g In the accompanying drawings Figure 1 is an elevation of a device embodying this invention. Fig. 2 is an enlarged sectional viewof the head portion thereof. Fig. 3 is a section on line 3-;3, Fig. 2. Fig. .4 is a similar View to Fig.2, showing the parts in a different position. Fig. 5 is afront elevation of the mechanism in the mechanism case. Fig. 6 is a section on line 66, Fig. 5. Fig. 7

accomp any- -is an enlar ed detail view of the upper part of the mec anism shown in Fig 6, with the pertains to.

Specification of Letters Patent;

Application filed. March 24, 1906. Serial No. 307,811.

parts in a different position.

Patented. Dec. 29, 1908.

Fig. 8 is a view similar to Fig. 7, with the parts in a different position. Fig. 9 is a view similar to Fig. 7, looking at the parts from the opposite side of the wheel 54. Fig. 10, is a section on line 1010, Fig. 5. Figs. 11, 12 and 13 are diagrams showing the controller and circuits when the signal blade is-in the danger, distant and clear positions.

Referring to the drawings, 1 represents the base ofthesignal post, which is preferably made hollow, and is utilized for storing the .battery which providesthe electric current for operating the signal, but the battery which is preferably a storage battery, may be placed in any other positioii or at a distance from the post if desired. On the base 1 is arranged the mechanism case 2, which is preferably provided with a door 3 for giving access to the interior thereof. On top of the mechanism case 2 is arranged the signal post of mast 4 which consists of a hollow 11011 tube, and on the upper end of the signal post 4 is arranged a head or casing 5. A semaphore shaft 6 extends horizontally through the head5 and on the projecting end thereof is secured a semaphore 8 which is provided with a signal blade 9. The sema hore is counterweighted so that it will fall y gravity to its normal position car sing the signal blade to extend in a horizontal direction, which is the position i'sed to indicate danger. On the head 5 is arranged a bracket 10 which supports the signal lam 11. On the semaphore shaft 6, within 1: e casing or head 5, (see Figs. 2 3 and 4),is. rigidly secured the semaphore shaft sheave 14 which is in the form of a sector-shaped plate having a cable or chain groove 15. One end of a chain 16 is secured at the up or end of the groove 15 and the other end of thechain extends down into the signal post 4. A latch 17 is supported on a pin 18 in proximity to the late; 14 and is provided with a lug 19 whic extends under the sheave 14 and locks the sheave 14 against downward rotation. The latch is normally held in its locking osition by a spring 20. The lower end of t e latch 17 is arranged to lie in the ath of the chain 16 and is preferably provided with a roller 21, and a gt ard ring 22 which prevents the chain running off of the roller 21. When the chain 16 is. slack it will therefore curve around the lower end of the latch but when the chain is pulled taut, by the means herelit inafter described, it will cause the latch 17 to move back leaving the sheave 14 free to swing down. The object of this arrangement is to mechanically lock the semaphore and blade in the danger position so that they cannot be changed by any exterior force and to; automatically unlock them as soon as'the mechanism for changing the same is put into operation. in the head is preferably formed a hand hole 2% which is closed by a cover held in position by a button 26. To the rear wall of the mechanism case 2, (see '1 igs. 5 and 6), near the upper end thereof, is seer red a plate or table 56 and near the lower and is seci red a plateor table 31. A pair uprights 32 are arranged at the sides of the said tables and form a side frame or pport therefor. On the table 51 is mounted an electric motor 33 of any preferred pattern and on the motor shaft 3% is loosely motnted a pinion 35 having a serrated clttch meml or or disk 36 formed integral therewith. On the motor shaft 34 is slidally secured a serrated clttch memler or dis 57. The clutch members are normally held apart l. y a spring 38. Below the motor shaft 54 is arranged a ch tch lever traolet 39 on vlich is pivotally arranged a ch tch lever having a sort arm 46 and a long arm 41. Tires .ort arm 40 is for? ed and carries a pin 29 wlich extends into an aim. lar groove 42 formed in tlle shank portion of the cli'tch 'mem'. er 7 and the longer arm 41 of the ch tch lever extends down thro'. gh an 0 ening 4-3 in the ta" le 15. To the i nder si( e of the la le 15 is see". red a solenoid or s e ing magnet 44 having a pli nger 45 which is free to slide therein. To the o". ter end of tie ph nger 45 pivetally see. red the lower end ofthe arm 41 of the clutch lever.

When the solenoid is energized by the pass ing of an electric current therethrough the plunger 45 is drawn in, actuating the clutch leverv'hich causes the clutch member 37 to move out on the shaft 34 and engage the clutch member 36 thereby connecting the pinion 35 tl1 ltl'l6 motor shaft 34. When the current ceases to flow through the solenoid, the spring 38 n ill cause both a disengagement 'of the clutch members and the withdrawal of "the plunger from the solenoid. The action of the springiflS insures tlzo prompt:lisengagcmentof tle clutch mcmlrcrs but may be omitted as the mend crs will not remain in cngagenicIitaftcr the solenoid ceases to be extends betwern the coarse wheel 54 and thereon is keyed a sheave 56. On the table 30 is supported a dash pot 57 which consists of a cylindrical casing open at the bottom and havinga small opening at the top through which the piston rod 58 enters. The upper end of the piston rod 58 is secured to the chain 16 and from the lower end thereof a chain 59 extends to the sheave 56. On the lowe'r end of the piston rod 58 is secured a disk 60 above which is slidably mounted a piston head 61 provided with air holes 62 which are closed-when the piston head rests on the disk 60. A pin 63 limits the upward movement of the piston head. /V hen the piston rod moves down inthe dash pot it will slide through the piston head until the pin 63 comes in contact with the piston head and the air holes in the piston head will therefore be uncovered and the air will pass freely through the piston head on its downward movement. When the piston rod moves up in the dash pot the piston rod will slide through the piston head until the disk 60, comes in contact with the under surface of the piston head and covers the air holes and then when the piston head moves up the escape of the air from the dash pot will be greatly impeded and the upward movement of the piston rod will be consequently retarded or cushioned.

To the under side of the table 30 is secured the controller box or casing 65 in which is 'ournaled a shaft 66, one end of which extends ont over the gear wheel 54. On the shaft 66 is mounted a movable switch member 67 which is preferably sector-shaped in cross section and is arranged to make -contact with a stationary switch member 68. On the end of the shaft 66 is secured a lever arm 69 which extends alongside of the wheel 54. On the lower end of the lever arm 69 are formed two cam-surfaces 70 and 71' and on the upper end. of saidlever arm 69 are formed three notches72, 73 and 74. Above the lcvcrarm 69 is mounted a gravity latch "ordog 7 5 which is arranged to enter the notches in the lever arm 69 and lock the movable switch member against accidental displacement. On the wheel 54 are mounted two pins 76 and 77. When the wheel is rotated backward (i. a; in the direction in'di-' cated by the arrow) the pin '76. is arranged to come in contact with the cam surface 71 causing the lever arm 69 to swing up thereby rotating the shaft66 and causing a downward movement of the movable switch member 67 and on the forward movement of the wheel 54 the 'pin '76 will again pass under the cam surface 71 causing the lever armto swing down rotating the shaft 66 and producing an upward movement of the moval'ile switch IiiOIlllJQl 67. I The .pin .77 on the backward movement of the wheel 54 will pass under the ram surfaceJO and s milarly to the pin 76 wni cause thcleverarm 69 to swing up roa brac et 85 and near the upper end thereof that t re magnet is held down by t tating the shaft 66 and producing a downward movement of the movable switch member 67, and likewise on the forward movement of the wheel 54 the pin 76 will pass back under the cam surface 70 causing the lever arm 69 to swing down rotating the shaft 66 and producing an upward movement of the movable switch member 67. The controller box is provided with a front plate of glass or other transparent material which makes the box moisture proof.

On the wheel 54 are arranged two stationary awls 78 and 79 which are preferably provided with cam shaped extensions 80 and 81, res ectively. To the table 30 is secured is formed a double strap 86 in which are slidably mounted the coils of an electromagnet 87. To the top of the magnet 87 is secured a plate 88 which carries a screw-threaded stem- 89 which passes through a support 90 which extends upfrom the strap 86. The stem 89 is secured to the support 90 by means of a nut 91 and by adjusting the nut the magnet can be raised or lowered accordingly. Around the stem 89 between the plate 88 and the su port 90 is arranged a coil spring 92 so e pressure of the spring but is free to move up under pressure. To the side of the bracket 85 is pivotally secured an arm 93 towhich is secured a cam shaped plate 94. On the arm 93'is arranged a weight 95 and on' the surface of the weight 95 is secured a plate 96 of iron or other magnetic metal which is so placed that when the arm 93 is raised the plate 96 will come in contact with the poles of the magnet 87. On the bracket 85 below the arm 93 is pivotally secured a trip latch 99, which is arranged to engage with the teeth on the wheel 54 and lock the wheel against rotation. When the arm 93 falls to its lowest position it trips the latch and frees the wheel 54. (in theend of the latch 99 is preferably secureda rollerlOO. @uthelower end of the bracket is mounted a spring bumper 102 and on thewhecl 54 is formed a projection 103 arranged to come in contact with the bumper 102 so as to stop the movement of the wheel 54.

In theaccompanying diagrams (Figs, 11,

' 12 and 13) the home block is indicated a,

the'distant block as band the clear block as c. The terms home, distant and clear, of course, being relative to the signal located within the block a, and for a signal located within the block b, the block 12 becomes the home block, and 0 becomes the distant block, and so on. The signal circuit is indicated by d and includes a storage battery, motor, solenoid, the

locking magnet and the stationary and mov able switch members of the controller. The signal circuit is opened and closed, aside from the operation. of the controller, by two electric switches d" and (F, the operations of which are controlled by the operation of the electromagnets, c and f arranged in the relay or track circuits 0 and f, respectively. hen a train enters the home block a the home track circuit 0 will be closed enc'gfzing the electric switch a which opens the switch (Z completely cutting off all current from the signal, for although the switch d", controlled by the distant circuit f is closed, the controller switch members are not in position to complete the circuit through the switch (1 and the signal mechanism will assume the position shown in Figs 5 and 6, and the circuits will be as represented in Fig. 11. When the train leaves the home block and enters the distant block b, the track circuit e of the home block is opened and the track circuit f of the distant block is closed which energizes the electro magn'etf which opens theswitch (P. The circuits will then be in the position as shown in Fig. 12, and as the controller switch members are in position to complete the circuit through the switch dtth'e solenoid, the electric motor and the electro magnet will all be energized. The solenoid, therefore draws in the plunger causing an engagement of-the clutch members on the motor shaft and the train of gears between the motor shaft and the shaft 53 are actuated, rotating the sheave 56 which winds up the chain 59, drawing down the piston rod 58 and the chain 16 which is secured to the upper end of the piston rod and to the semaphore sheave 14. The pull on the chain 16 automatically unlocks the semaphore sheave and pulls it down thereby swinging down the semaphore blade until it has reached the position termed the distant position. When the signal'blade has about reached the distant position the pin 76 on the wheel 54 will pass under the cam surface 71, thereby shifging the movable switch member of the controller, which cuts out the motor and the solenoid, but does not cut out the current from the storage battery of the signal circuit which is at that time passing through the electro magnet and at the same time the extension 80 on the pawl 7 8 will pass under the plate 94, lifting the arm 93 and bringing the plate 96 thereon in con-' tact with the poles of the electro magnet 87.

Perfect contact between the magnet 87 and the plate 96 is always secured as the magnet both adjuslably and resiliently supported and is preferably so adjusted that the plate 96 will come 'in cont act with it before the arm 93 has been raised sufficiently to allow the cam 80 to clear the plate 94, and .the magnet 87 will of course move up against the pressure of the spring'92. On the further movement of the wheel 54 the trip latch will fall behind the pawl 78 and lock the wheel '54 against the tendency of the semaphore to actuate it in the opposite di retion from that in which it was actuated by the motor. When the train leavesthe distantblocl: and enters the clear block 0, the track circuit 1 of the distant block is undetermined osition a sheave mounted opened and the electro magnet f ceases to be energized and the switch d closes! The circuits will then be in the position as shown in Fig. 13, and as the controller switch members are in position to complete the circuit through the switch d the solenoid, the electric motor and the locking electro magnet will all be energized. 'Ihe solenoid, therefore, draws in the )lunger causing an engagement of the clutc 1 members on the motor shaft and the train of gears between the mos tor shaft and the shaft 53 are again actuated, rotating the sheave 56 which through its operative connection pulls down the semaphore sheave thereby swinging dovm the somaphore blade until it has reached the position termed the clear position. When the signal blade has about reached the clear position the pin 77 on the wheel 54 will pass under the cam surface 70, thereby shifting the movable switch member of the controller, which cuts out the motor and the solenoid, but leaves a weak current passing through the locking electro magnet. If another train enters the home block the relay circuit e will then be closed and the switch. cl will open cutting off all current from the motor, solenoid and locking olcctro magnet. The arm 93 which was held up by the locking magnet 87 will fall tripping the latch 99 and thereby freeing the wheel 54 and the semaphore will then fall by gravity to its original position and all the mechanism connected therewith will be actuated in the reverse direction to that in which it was actuated by the motor.

What I claim is:

1. In a railway signal, the combination of signal mast, a semaphore shaft journaled a on said mast, a semaphore mounted'on said shaft and counterweightod so as to assume a on said shai't a chain secured to said sheave, a locking device for securing said sheave against rotation arranged to projectin the path ol said chain and means for exerting a pull on said chain.

2. In a railway signal, the combination of a signal mast, a semaphore shaft journaled on said mast, a semaphore secured on said shaft and counter-weighted so, as to assume a predetermined position, a sector-shaped sheave mounted on said shalt, a chain secured to said sheave, a pivotally supported latch arranged to lock said sheave against rotation and having its end extending into the path of said chain, a roller arranged on the end of said latch where the chain passes over it and means for exerting a pull on said chain.

3. In a railway signal, the combination of a-sernaphore arranged to rotate in an arc of a i scales sitioln, means for mechanically locking said semaphore in its normal position, means for rotating said semaphore to other predetermined positions, means for mechanically locking said means for rotating said semaphore, means for electrically unlocking said locking means, means for unlocking. the semaphore the semaphore is set in operation, a signal circuit, an electric motor arranged in said circuit and operatively connected with said means for rotating said semaphore, a confor operating said controller, an electric switch arranged in said circuit, and a track Qcircuit, opened and closed by the movement of trains, arranged to control the operation of said switch.

4. In a railway signal, the combination of a mechanism case, a signal mast, semaphore mounted on said signal mast so as to rotate in an arc of a circle, means for me chanically locking said semaphore in its semaphore to other predetermined positions, means tor mechanically locking said means for rotatin said sema here means for elec- P P trically unlocking said locking means, means for automaticall UILlOClQH the more is set in operation, a signal circuit, an electric motor arranged in said circuit, a clutch arranged to form an operative connection between the mechanism for rotating a plunger arranged in the solenoid and means actuated by the movement of the said plunger for operating said clutch. 5. In a railway signal, the combination a mechanism case, a signal mast, a semaphore shaft mounted on said mast, a semaphore secured on said shaftand counter weighted so that it will assume a prede'ter mined position, a sheave secured on the semaphore shaft, a shaft mounted in mechanism case, a sheave secured on the last-mentioned shaft, a flexible connection. between said'sheaves, a wheel secured on said last-mentioned shaft, a latch for locking said mounted above said latch and arranged so that in its lowest position it will trip said latch, an electro-magnet -supported above said arm for holding said-arm above said latch, nieans'for energizing and dcnergizing said electro-magnet and means for rotating said wheel.

6. In a railway signal, the combination of a mechanism case, a signal mast, a semaphore shaft mounted on said mast, a semaphore secured on said shaft and counterweighted so that it will assume a predeter-- circle and counterweighted sovfila when ree it will assume a predetermined or normal po semaphore shaft, a shaft mounted in the mc'el'mnissc. case, a sheave secured on the automatically when the means for rotating troller arranged in said signal circuit,

when the means for rotating semaphore I I semaphore and the electric motor, a solenoid,

wheel against rotation, an arm pivotally danger position, means for rotating said mined position, a sheave secured on the said wheel against rotation, an arm .pivotally semaphore shaft, a shaft mounted in the lastrmentioned shaft, a flexible connection between the said sheaves, a wheel .secured on said last-mentioned shaft, a latch for locking weighted so that it, will assume a predetermined position,- a sheave secured on the mechanism case, a sheave secured onthe last-mentioned shaft, .a flexible connection between the said sheaves, a wheel secured on said last-mentioned shaft, an electric motor,

a gear wheel loosely mounted on the shaft of the motor, a train 0f gears connecting said gear wheel with sa first-mentioned wheel, a clutch member formed integral with said gear wheel, a clutch member shdably mounted on the motor shaft, a solenoid, a plunger arranged in said solenoid and. a pivotally supported .lever having one :end operatively connected withsaid plunger and the other end operatively connected with the lastmentioned clutch member.

8. In a-railway signal, the combinationof a mechanism case, a-signal mast, a semaphore shaft mounted on said mast, a semaphore secured on said shaft, a shaft mounted 1n the mechanism case, means for operatively connecting said shafts,,a wheel secured on said shaft in the mechanism case, a latch for lock ing said wheel against rotation, an arm pivotally mounted above said latch and arranged so that in its lowest position it will trip said latch, an electro-magnet supported above said arm, means arranged on said wheel for lifting said arm'against sai'd electro magnet, means for energizing and denergizing said electro-magnet and means for rotating said wheel.

9. Ina railway signal, the combination of a mechanism case, a signal mast, a-semaphore shaft mounted on said mast, a semahore secured on said shaft, a shaft mounted 1n the mechanism case, means operatively connecting said shafts, a Wheel secured on saidshaft in the mechanism case, a stationary switch member arranged in said mechanism case, a movable switch member arranged to make contact with thestationary switch member, an arm secured to said movable switch member, cam surfaces arranged on said arm, projections arranged on said wheel a (1 arranged to travel under said cam surfaces and actuate said arm, an electric circuit having its terminals connected to said switch members and an electric motor arranged'in said electric circuit and operatively connected with said wheel.

10. In a railwaysignal, the combination of a mechanism case, a signal mast, a semaphore shaft mounted on said mast, a semaphore secured on said shalt, a shalt mounted in the mechanism case, means for operatively connecting said shafts, awheel secured on said shaft in the mechanism case, a stationaryswitch member arranged in said mech- 4 anism case, a movable switch member arranged to make contact with said stationary switch member, an aim secured to saidmov able switch member means for holding said arm against accidental displacement, cam

surfaces arranged on said arm, projections arranged on said wheel and arranged to travel under said cam surfaces and actuate said arm, an electric circuit having its terminals connected to said switch members and an electric motor arranged in'said electric circuit andoperatively connected with said wheel,

11. In a railway signal, the combination of a signal mast, a semaphorezshaft jour-v naled on said mast, asemaphore secured-on said shaft and;counterweighted so as to assume a predetermin d position-a sheave;

mounted onsaid shaft, achain secured :to said .Sheave, a pivotally; supported latch arranged to' lock said sheave against rotation and having its end extending into the ath of said chain, a mechanism case, a s aft mounted in said mechanism case and 0 eratively connected with said chain, ;a weel secured on said last:mentioned.shaft, alatch for lockingsaid wheel a ainstro tation, ;an arm pivotally mounteda ove said latehiand arranged so that whenin its lowest position it will trip the latch, an electro-magnet yieldingly supported above said arm, for holding said arm above said latch, means arranged on said wheel for liftingsaid arm against said electro -magnet, an electric motor, a gear wheel loosely mounted on the shaft of the motor, a train of gears connecting said gear wheel with said first-mentioned wheel, a clutch member connected with said gear wheel, a clutch member slidably mounted on the motor shaft, a solenoid, a plunger arranged in said solenoid and a pivotally supported lever having one end operatively connected with said plunger and the other .end operatively connected with said clutch member.

12. In a railway signal, the combination of a signal mast, a semaphore shaft journaled on said ast, a semaphore secured on said shaft arid counterweighted so as to assume a predetermined position, a sheave mounted on said shaft, a chain secured to said sheave, a pivotally supported latch arranged -to lock said sheave against rotation and /having its end extending in the path of said chain, a mechanism case, a'shaitmonntei'l in said mechanism case and 'operatively connected with said. chain, at Wheel secured on said last-mentioned shaft, a latch for lock ing said wheel a ainst rotation, an arm pi-Votaily mounteo above said latch and arranged so that'when in its lowest position it will trip the latch, an electric circuits an electro-ma net yieldingly supported above said arm or holding said arm above said latch, means arranged on said Wheei for lifting said arm against said eiectro-niagne an electric motor, a gear wheel looseiy mounted on the shaft of the motor, a train movable switch member, caln surfaces arranged on said arm, projections arranged on said Wheel which pass under said cam surfaces and actuate said arm, an electric switch arranged in saidjcircuit, track cir cuit, opened and. closetl'h the movements oil trains arranged to control the operation (It said. switch.

18. In a railway signal, the combination of a mechanism case, a signal most, a semaphore shaft mounted. on said mast, semaphore secured on said shaft, a wheel opeii' ativel' connected with said shaft, a latch for loosing said heei against rotation an 'n'ipivotallv mounted above said latch and a range o that when in TiJSli'J'VsE-iiPOSiliOll it will trip the'latciL'a-n :ctroeniagnet an? f'os'tobly supported above said L'CI11,T0T holch '2 those 'siiii iatci'i, means for ing saicl a i 111g said eiectroans for rotating said "Wheel, 14. in a nil? a niechoni n case phore shalt nountco. on ssicl sen1aphoi'o secured. on said: shaft, 21. motor, ii'lQCilanisni opei'atively connecting said motor and said semaphore shaft, a latch for ion-hing said mechanism, an arm pivotaily niountei above said latch and. arranged so that when in its -lowest position it will Mip the latch, an

eiectroona net sun ortco shove said arm o 11 2 for holding said arm above said latch,

ior energizing and denergizing' said eleetromagnet and means for rotating said Wheel. 15. in a i'aili-vay signal, the comifnation of a mechanism. case, a signal. mast, a serum phore shaftniountcrl on saidnnist, n semaphore secured said shz a motor, moo-h W213" signal, the combinationsignal mast, a seniaanism operatively coni'icuing sairi motor and said semaphore shaft, :1 .latoh forloching said rnechnnisni, niovahie a n. a ranged to trip s c. latch, an QlQQtI'O- lm means for bringing arm in Contact said. electroqnagnet, nzcans, yiehling supporting said electro niagnet and. means;

for adjusiing said magnet.

r testimony whereof, l

in s specification ,H'i, the presence

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