US693094A - Signal and signaling-circuit. - Google Patents

Description

N0. 693,094. Patented Fell. Il, |902.

J. A. WILSN.

SIGNAL AND SIGNALING CIRCUIT.

(Application filed Aug. 13, 1900.)

3 Sheets-Sheet I.

(No Model.)

YH: Nonms Persns co.. wumLm-w., WASHINGTON. D. c4

J. A. WILSON.

SIGNAL AND SIGNALING CIRCUIT. v

(Application filed Aug. 13, 1900.)

W/ INE SSE S (No Model.) 3 Sheets-Sheet 2.

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Nn. 693,094. 'Patented Feb. n, |902. y J. A. wlLsoN.

SIGNAL'AND SlGN-ALING CIRCUIT.

` .'(Appucaeiun mea Aug. 13, 19oo.)

(No Model.) 3 Sheets-Sheet 3.

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UNrTnD STATESv PATENT Fries..

VJOSEPH A. \VILSON, OF VESTFIELD, NEW JERSEY, ASSIGNOR TO THE HALL SIGNAL COMPANY, A CORPORATION OF MAINE.

SIGNAL AND SAIGNALIN'G-CERCUIT.

SPECIFICATION forming part of Letters Patent No. 693,094, dated February 1 1, 1902. Application filed August 13,1900. Serial No. 26,703. (No model.)

To all whom t may concern: A Referring to the specific embodiment of the Be it known that I, JOSEPH A. XVILSON, a invention shown in the drawings, lis a home citizen of the United States, and a resident signal, and 2 a distant signal, consisting, as 0f IVestfield, in the county ofUnion and State shown, ofthe ordinary semaphore-blades and 55 5 of New Jersey, have invented certain newand arranged, as shown in Fig. 3, in the ordinary useful Improvements in Signals and Signal` manner upon signal-post, counterweighted ing-Circuits, of which the following is a speci` at 4 to hold the signals normally at danger. fication. 5 is an actuating-rod secured in the ordi- My invention relates to signals and to cirnary manner at 6 to the semaphore-blade and 6e xo cuits for controlling and operating signals. adapted when raised to lower the signal to its It is of especial value in railway-signals, and safety position. particularly in connection with automatic 7 is the actuating-rod for the distant signal railway signaling apparatus. 2 and is similarly secured at a point 8. It has for its objects to simplify signaling 9 is a motor, preferably electric, for operat- 65 u i5 apparatus, to render it more perfect and efing both of the signals l and 2. It is adapted ficient in action and less liable to derangewhen operatively connected with either sigment or breakdown in operation, to reduce nal, as hereinafter described, to move the the cost of operating signaling apparatus, and said signal in one direction. I provide congenerally toimprove such apparatus and also nections between the motor and each of said 7o e 2o to provide improved circuits in connection signals for operating the signals, and in one with the use of signaling apparatus for the betof the sets of connections-as shown, that conter and more efficient operation of the same. necting with thehome signal-I include a de- It consists of the novel features and com tachable portion for making and breaking the binations herein set forth. Y connection between the motor and the signal, 75 25 In the drawings accompanying this speciso` that the motor may be connected with or fication and forming a part hereof, and in. be disconnected from one signal without afwhich similar reference characters in the diffecting its connection with the otherl signal, ferent figures represent corresponding parts, as will be presently described. I also provide I have shown my invention in its preferred means automatically actuated by one of the 8o ,o form and as embodied in railway signaling signals-as shown, by the home signal-as it apparatus and circuits therefor, and -I will is operated one way or the other for detaching now proceed to describe the specific form orv such detachable portion from Operative posiembodiment of my invention shownv in said tion and for replacing it therein to discondrawings. neet or connect the home signal and motor. 85 3; Referring to the embodiment of my inven- I also provide means for holding the signals tion shown in the drawings, Figure l isaverin the positions into which they have been tical section of signaling apparatus embodymoved by the motor and means for releasing ing my invention, the signals themselves and and returning them to their original positions. the circuits being omitted. Fig. 2 is a ver- These means for moving, holding, releasing, 9o 4o tical section of the same, taken at right an. and returning the signals are so arranged gies to the section of Fig. l. Fig. 3 is a view that both signals may be operated by the same of a pair of home and distant signals to which motor without interferencewith each other. my invention as shown is applied. f Figs. 4 I will now proceed to describe the connecand 5 are enlarged detailed views of parts of tions between the motor and the signals and 95 45 the said apparatus. Fig. 6 is a diagrammatic the means for moving the signals to their said View illustrating one form of my improved positions, holdingthem there, releasing them, apparatus and circuits as applied to an indiand returning them to their original positions eating home and distant signaling system. as the same are shown in the drawings. Fig. 7 is a detailed view of the detachable por- 10 is the shaft 0f the motor. 1o@ 5o tion of the connect-ionsbetween the motor and l1 11 are two operating-belts, one for each the home signal. signal'and adapted to be driven from the mo totl independently of each other. These belts are moved by the motor in one directionand by means of apawl 12 and ratchet 13 on shaft 10 for the left-hand operating-belt, as viewed in Fig. 1, and by means of a pawl 12, engaging the lower gear 14 of the gearing connected with the other operating-belt, as shown in Fig. 2, are prevented from backward rotation. Each belt 11 is connected through a train of gearing 14 and a gear 15, connected with the shaft of the motor running over a sprocket- Wheel16 on the shaft 17, forming part of the said gearing. Each belt 11, preferably shown as asprocket-chaimalsc engages with a sprocket-wheel 18 on shaft 19and runs over idlers 20 and 21. Actuating- rod 5 or 7 carries a clutch adapted to unite and disunite the rod 3, and therefore its signal, with belt ll at any point thereof, and when the clutch thus unites the belt and the signal and the belt is driven rod 5 or will be liftedandthe signal be lowered into safety positiont In its preferred form the clutch comprises sprocket-Wheels 1S and a catch to lock the sprocket-wheel. Also Xed on shaft 19 is a toothed Wheel 22. Suspended from bracket 23, secured to a rod, which bracket carries shaft19, is a catch 24,

`having a roller 25, loosely mounted on a pin projecting from catch 24, adapted to be moved into and out of the path ofthe toothed Wheel 22, so as to lock and release that wheel, and thereby lock and release wheel 1S, so as to clutch and unclutch belt 11. The motor and clutch are both preferably controlled electrically by a train, as will be hereinafter described. 'lo this end a magnet 26 is fixed to bracket 23. Magnet 26 has an armature 27, carried on the lower end of catch 24, which when drawn toward the magnet moves the catch so that the roller 25 will lock wheel 22, and thus clutch chain 1l. 'When the magnet is denergized and its armature released, the catch swings back from vthe magnet and the Aprojectingroller 25 moves out of the path of the Wheel, so as to unclutch the chain. When theV motor is energized and one or the other set of connections between it and one of the signals is made through the clutching devices just described, bracket 23 and the rod are lifted, and the signal connected with the rod islowered to safety As long as the clutch is operative the said signal Will be held at safety;7 but when the clutch is released bracket 23, with all that it carries, and rod 5 will descend, through their own weight raising the signal to dange-r, sprocketwheel 18 running down chain 11. My preferred means for energizing and denergizing the motor and clutch will be presently described. In the embodiment of my invention shown herein the home signal is rst moved tofsafetyand is held in that position, and

-the distant signal is subsequently operated.

In order to permit both signals to be operated by th'e same motor without interference with the operation of either signals, I insert in the connections between one of the signais (preferably the home signal) andthe mo-v 15 may thus be made to revolve with shaft 10. When the signal is at danger,7 pin 2S is in engagement with gear 15. As rod 5 rises and the signal goes to safety rod 5 comes into contact with' lever 30, which operates lever 29 and disengagesgear 15 and pin 28, permitting the motor-shaft to keep .on turning without moving gear 15 of the home signal of the apparatus. These parts are timed so that this disengagement should take place as the home signal 1 reaches its safety position. The shaft of motor 9 can now run, moving the distant signal to a safety position without interfering with the home signal. The detachable portion, gear 15, is restored to its original position as the home signal 1 rises to its danger position through 'the cou'nterweight action of lever 30. The removal and return of this detachable portion are thus automatioally accomplished.

Motor-circuits, preferably controlled by a train on the track, as hereinafter described, are provided, one for each signal. When a signal is to be moved, the circuit through the motor is closed and its belt 11 started, and magnet 26 is also energized,fand the signal is moved into its said position. In order to insure the automatic breaking of the circuit through the motor when the signal reaches its said position, I cause the motor-circuit to pass through contact-points 3l 32 and automatically break the circuit at these points by means of a projection 33, which as the rod 5 rises to its upper limit passes between contact-points 3l 32 and forces them apart. Contact-points 31 are mounted upon spring 34, carried by armatu re 35; This armature forms an additionalarmature of each magnet 26 and ismounted upon spring-arms v37, secured to bracket 23. When magnet 26 is energized, armature 35 is attracted and contact is closed between contact-points 3l 32, thus closing the circuit through the motor. This circuit is automatically broken by projection 33, as above described. In the form of signaling system shown herein I preferably have each -home signal control, in part, two of the distant signals, for example, causing the home signal when it goes to danger7 to send the distant signal of the same pair of signals to danger and when it goes to clear7 to clear the distant signal of the pair of signals next in the rear. For this purpose I place a circuit-controller in the circuit of each distant signal, which I thus place under the control of a home signal, andautomatically open and close the said circuit-breaker as the home IOO home signal goes to safety As the rod 54 drops the signal goes to danger, and the contact-points of circuit-controller 40 separate. The circuit through the distant signal in question, which is made to pass through circuit-controller 40, is thus automatically controlled by the movement of the home sig-4 nal in question. In Fig. 6 I have shown two of these circuit-controllers 40 as connected with each home signal.

In Fig. 6 I have shown the preferred form of my invention as applied to an indicating home and distant signaling system. As there shown, l 1 represent the home signals, and 2 2 distant signals. These series of home and distant signals are arranged in pairs, each pair comprising a home and a distant signal, and both the signals in each pair are operated by a single motor 9. The portion of track shown is divided into blocks, those shown being numbered 42, 43, 44, and 45. These are insulated from each other in the well-known manner, and each is provided with a track-circuit consisting of a battery 46 and the rails ofthe block in the well-known manner. These track-circuits are controlled by the train in the well-known manner. I provide motor-circuits for each motor, one for each signal. 47 47 represent the battery of these circuits. The circuit through the motor f or the home signal runs through wires 48, 49, and 50, the circuit-controller consisting of contact-points 3l 32 and wire 5l back to battery. Each motor-circuit for the corresponding distant signal corresponds with the above, except thatvit passes from wire 49, through wire 52, through circuit-controller composed of contact-points 31 32, wires 53 51, back to battery. Each motor-circuit is controlled by its magnet 26, as already described. I provide a series of circuits controlled by the track-circuits and intervening betweenthem and the motor-circuits and holdingdevices,

or, in other words, magnets 26. As shown, I provide three such circuits controlled by each track-circuit and intervening between it and the means for moving, holding, and releasing each home signal, or, in other words, magnet 26 and its connections, one of said circuits operating when controlled by the said track-circuit to put to danger the home signal immediately in the rear of the trackcircuit in question, another of the said circuits operating when thus controlled to continue in clear position (if it has already been cleared) the home signal next in advance of said track-circuit, and the third one of said circuits operating when thus controlled to clear the home signal next but one in advance of the said track-circuit when the track guarded by said home signal is unoccupied.

The circuits connected with each block shown in the drawings are exactly alike, for the purpose of pointing out the three circuits just referred to. Those of the track-circuit of block 43 will be explained,it being understood that the circuits of each of the other blocks are exactly identical. The rst circuit referred to as thus controlled by the track-circuit of block 43 has for its object to put to danger a home signal standing at the right end of block 42, it being supposed for the purpose of this explanation that the train has entered upon block 43 and is standing at a point 54. In this position of the train magnet55 of the track-circuit of block 43 is denergized. This allows circuit-controller 56 to fall away from its contact-point 57, and this breaks the circuit through magnet 26 of the home signal in question, causing that signal togo to danger. For present purposes the rest of the circuit through this magnet need not be traced. The second circuit referred to as cont-rolled by the track-circuit 43 has for its object to continue in its clear position, if it has already been cleared, home signal l standing at the right end of block 44, or, in other words, in advance of the track-circuit of block 43. As will be presently understood,this home signal had been previously cleared when the train entered upon block 42. The control of the track-circuit 43 is for the purpose of continuing the home signal at safety, which without the control of the said track-circuit, to be presently described, would go to danger, as will be hereinafter understood. This is accomplished by the ,circuit-controller 58. A train when at 54-by denergizing magnet 55 causes circuit-controller 58 to make contact with the contact-point 59, closing the circuit at this point. This closes a circuit through magnet 26 of the home signal in question. This circuit is as follows: from battery 60 to wires 6l 62, circuit controller 63, wire 64, magnet 26, wires 65, circuit-controller 58, contact-point 59, wires 66 and 67, to line-wire 68 and back to battery. Magnet 26 of the home signal in question is thus kept energized and that signal kept at its safety position. The third circuit referred to as controlled by the track-circuit 43 has for its object to put to safety the home signal at the right end of block 45 or the home signal next but one in advance of the track-circuit 43.A This is accomplished by means of circuit-controller 69, which makes contact with its contact-point 70 as magnet 55 is denergized. This closes a circuit through magnet 26 of the home signal in question. This circuit is as follows: From battery 7l, wires 72 7 3, cir- IOO IIO

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cuit-controller 74, wire 75, magnet 26, vwire vance of that track-section at safety, and

to put the home signal at the end of the next namely, the distant signal of the same pair asthe home signal and the distant signal of the pair next in the rear. These circuits are controlled by the home .signal through contact-points 40, which are automatically closed, as has already been described, vby each home signal when moving to its safety position and automatically opened when the home signal moves to its danger position. In describing these two circuits I will refer to the two circuits controlled by the home signal 1 in advance of track-section 43, or at the right end of track-section 44. When the home signal goes to safety, its object is to clear the distant signal of the pair of signals next in the rear or the distant signal 2 at the right of track-section 43. It will be remembered that this home signal is sent to its clear position by the train entering upon track section42. In this position of the parts and with no train upon any of the other sections the home signal at the right end of the block 43 is of course standing at safety andthe circuit-controllers controlled by it are in their closed position. As the home signal at the right end of block 44 goes to fsaf'ety it closes its circuitscontrollers 40, thus closing the circuit through magnet 26 of distant signal 2'at the right end of the block 435 This circuit is as follows: from battery through wire 61, the upper right-hand cir-4 cuit-'controller 40, wire 78, the lower left-hand circuit-controller 40 at the right end of block 43, wire 79, magnet 26, wires 8O 67, and linewire 68 to the battery. The distant signal2 in question is thus at once put to safety.7 TheY other circuit, controlled by home signal I at the right end of the block 44, has for its object to'put to danger the distant signal 2 of the samev pair yas the home signal I in question. home'signal in question goes to danger by breaking the lower left-hand circuit-controller 40 connected with that signal. The circuit in question runs from battery 7l to wire 2,upper right-hand circuit-control1er40 to the right end of block 45, wire 8l, lower left-hand circuit-controller 40 at the right end of block '44, wire 82, magnet 26,'thence through wire 83 to'line-wire 68, back to battery. This circuit is broken at circuit-controller40 at the right end ot' block 44 and 'the distant signal in question is either put to danger orif previously at danger is kept at danger. The edect ot a train upon any block is to put the home signal just passed at danger, and with it necessarily the distant signal of the same pair, and also to hold at danger the distant signal of the pair next in the rear; also, to continue at safety7 the home signal next in This is accomplished whenv thev advance or at the end of the track-section in question and to'put the home signal at the end of the next track-section at safety and to put to safety with it the distant signal in advance of the track-section in question, provided two blocks in advance are unobstructed. By means of my improvement these results are obtained and each pair of signals are operated by a single motor without any interference whatever between the two signals. This is preferably accomplished automatically.

While I prefer to employ the embodiment of the invention shown in the accompanying drawings, it is to be understood that many changes in construction and arrangement in the apparatus and circuits may be made without departing from the invention and that various featuresshown in the drawings may be omitted or be replaced by others and still retain certain advantages of my invention. For example, it is not essential that the sigA nals be of the kind or variety shown, as any appropriate signals may be employed. The signals and other operative parts of the mech anism might be operated or controlled by means other than electrical. Thus, as shown, the motors, clutch, te., are preferably controlled electrically and by a train on the track; but this is not essential to my inven; tion in some of its features, nor are the particular circuits or arrangement of circuits shown essential to certain features ol"v my invention. Other changes and modilications than those specifically mentioned may also be made without departing from my invention.

I/Vhat I claim as new, and desire to secure by Letters Patent, is-

l. In a signaling device, the combination of a signal, a motor for operating it, connections between the motorand the signal includinga clutch and a detachable portion for making and breaking the connection between the motor and signal, means for actuating the clutch, and means automatically actuated by the signal for detaching the detachable portion from operative position and means for automatically replacing it therein, whereby a break in the connection between the motor and signal will be automatically made and closed by the signal as it moves to its differa ent positions.

2. In a signaling device, the combination of a signal adapted to move from one position to another and adapted to assume a predetermined position and to return thereto when re- 'leased from its other or set position, a motor for moving the signal to its set position, connections between the motor and the signal,

including a clutch and a detachable portion for making and breaking the connection between the motor and the signal, means for actuating the clutch, means automatically actuated by the signal for detaching the detachable portion from operative position as the signal reaches its set position and means for automatically replacing such portion in op- IOS) IIO

erative position as the signal returns to its predetermined position.

3. In a signaling device, the combination of a signal adapted to move from one position to another and biased to assume a predetermined position and to return thereto when released from its other or set position, a motor for moving the signal to its set position, connections between the motor and the signal, including a clutch and a detachable portion for making and breaking the connection between the motor and the signal, means for actuating the clutch, means automatically actuated by the signal for detaching the detachable portion from operative position as the signal reaches its set position, means for antomatically replacing such portion in operative position as the signal returns to its predetermined position, and means forholding the signal in its set position and for releasing it therefrom.

4. The combination in a signaling device, of two signals, a motor for operating said signals, connections between the motor and each of said signals, each connection including a clutch, one of said sets of connections containing a detachable portion for making and breaking the connection between the motor and the signal operated through said set'of connections, means for actuating each clutch and means automatically actuated by one of the signals for detaching the detachable portion from operative position or replacing it therein, whereby the motor may be connected with or disconnected from one signal without aifecting its connection with the other signal.

5. The combination in a signaling device, of two movable signals, a motor for operating saidv signals, an operating-belt for each signal, gearing connecting the motor with each operating-belt, a detachable portion in the gearing connecting with one of the operatingbelts for making and breaking the connection between the motor and said operating-belt without affecting its connection with the other operating-belt, a clutch connected to move with each signal and arranged to be united with and disunited from its operating-belt, whereby the motor may be connected with or disconnected from one signal without affecting its connection with the other signal.

6. The combination in a signaling device, of two movable signals adapted to move from one position to another and biased to assume a predetermined position, an operating-belt for each signal, a motor for driving the belts in one direction, gearing connecting the motor with each operating-belt, a detachable portion in the gearing connecting with one of the operating-belts for making and breaking the connection between the motorl and said operating-belt without affecting its connecto move its signal in one direction and when the clutch is disunited from the belt, it may return with its signal to their starting-point independently of the belt and whereby the motor may be connected with or disconnected from one signal without affecting its connection with the other signal.

7. The combination in a signaling device, of two movable signals adapted to move from one position to another and biased to assume a predetermined position, an operating-belt for each signal, a motor for driving the belts in one direction, gearing connecting the motor with each operating-belt, means for preventing the belts from moving backward, a detachable portion in the gearing connecting with one of the operating-belts for making and breaking the connection between the motor and said operating-belt without affecting its connection with the other operating-belt, a clutch connected to move with each signal and arranged to be united with and disunited from its operating belt, whereby when a clutch is united with its belt, the latter may be driven to move its signal in one direction and when the clutch is disunited from the belt, it may return with its signal to their starting-point independently of the belt and whereby the motor may be connected with or disconnected from one signal without aecting its connection with the other signal.

S. The combination in a signaling device, of two movable signals adapted to move from one position to another and biased to assume a predetermined position, an operating-belt for each signal, a motor for driving the belts in one direction, gearing connecting the motor with each operating-belt, a detachable portion in the gearing connecting with one of the operating-belts for making and'breaking the connection between the motor and said operating-belt without affecting its connection with the other operating-belt, a clutch connected to move with each signal and arranged to be united with and disunited from its operatingbelt, whereby when a clutch is united with its belt, the latter may be driven to move its signal in one direction and when the clutch is disunited Jfrom the belt, it may return with its signal to their starting-point independently of the belt and whereby the motor may be connected with or disconnected from one signal without affecting its connection with the other signal, and means for automatically throwing out the motor when either signal has made a predetermined movement.

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9. The combination in a signaling device, 5

tion with the other operating-belt, a clutch connected to move with each signal and arranged to be united with and disunited from its operating-belt, whereby when the clutchY is united with its belt, the latter may be driven to move its signal in one direction and when the clutch is disunited from the belt, it may return with its signal to their starting-point independently of the belt, and means, automatically actuated by one of the signals, when moved by the motor to its set position, for moving the detachable portion so as to break the connection between the motor and its operating-belt, and means for automatically restoring the detachable portion to its original position when the said signal returns to its original position, and whereby the motor may be connected with or disconnected from one signal without affecting its connection with the other signal.

10. The combination in a signaling device, of two movable signals, a motor for operating said signals, operating-belts, one for each signal, adapted to be driven from the motor independently of each other,a clutch connected to move with each signal and arranged to be united with and disunited from its operatingbelt, whereby the motor may be connected with or disconnected from one signal without aiectiug its connection with the other signal.

11. The combination in a signaling device, of two movable signals adapted to move from one position to another and biased to assume apredetermined position, operatingbelts,one for each signal, adapted to be driven from the motor independently of each other, a motor for driving the belts in one direction, a clutch connected to move with each signal and arranged to be united with and disunited from its operatingbelt, whereby when a clutch is united with its belt, the latter may be driven to move its signal in one direction and when the clutch is disunited from the belt, it may return with its signal to their startingpoint independently of the belt and whereby the motor may be connected with or disconnected from one signal without affecting its connection with the other signal.

12. In railway signaling, the combination of a series of home and distant signals arranged in pairs, each pair comprising a home and a distant signal, a motor for each of said pairs adapted to be operatively connected with either of the signals of said pair and when thus connected to operate said signal one way, devices for holding each signal in its set position, means for returning the signals to their original position when released by the holding devices, motor-circuits for each motor, one for each signal, a series of track-circuits controlled by the train, three circuits controlled by each track-circuit and intervening between it and the means for moving, holding and releasing the home signals, one of said circuits operating, when controlled by said track-circuit, to put to danger the home signal immediately in the rear of the track-circuit, another operating, when thus controlled, to continue in clear position if it has already cleared the home signal next in advance of said track-circuit, and the third of said circuits operating,when thus controlled, to' clear the home signal next but one in advance of said track-circuit, when the track guarded by said home signal is unoccupied, and two circuits controlled by each home signal, and intervening between it and the means for moving, holding and releasing two distant signals, one of said circuits adapted when4 thus controlled by a home signal to put to danger or continue at danger the distant signal of the same pair when the home signal itself goes to danger, and the other of said circuits adapted when controlled by said home signal to clear the distant signal of the pair of signals next in the rear, when said home signal is itself cleared, whereby the home and distant signals will be automatically operated and each pair of home and distant signals will be operated by a single motor.

13. In railway signaling apparatus, the combination'of two movable signals, a motor for operating said signals, an operating-belt for each signal, gearing connecting the motor with each operating-belt, a detachable portion in the gearing connecting with one of the operating-belts for making and breaking the connection between the motor and said operating-belt without affecting its connection with the 'other operating-belt, a clutch connected to'move with each signal and arranged to be united with and disunited from its operating-belt, magnets, one for each clutch, controlled by a train toopen and close the said clutches, whereby the signals may be automatically operated from one motor without interference with each other.

14. In railway signaling apparatus, the combination of two movable signals, a motor for operating said signals, an operating-belt for each signal, gearing connecting the motor with each operating-belt, a detachable portion in the gearing connecting with one of the operating-belts for making and breaking the connection between the motor and said operating-belt without affecting its connection with the other operating-belt, means controlled by a train to place said portion in operative position to make connection between the motor and operating-belt, means for automatically detaching said portion to break said connection, a clutch connected to move with each signal and arranged to be united with and disunited from its operating-belt, magnets, one for each clutch, controlled by a train to open and close the said clutches, whereby the signals may be automatically operated from one motor without interference with each other.

15. The combination in a signaling device, of two signals, a motor adapted when operatively connected with either signal to positively move the said signal one way, connections between the motor and each of said signals, one of said sets of connections containing a detachable portion for making and breaking the connection between the motor and the signal operated through said set of connections, means automatically actuated by one of the signals for detaching such portion from operative position and for replacing it therein, whereby the motor may be connected with or disconnected from one Vsignal withoutaiiectin g its connection With the other signal, means for holding the signals in the.

Witnesses:

EDWIN SEGER, GEO. W. MILLS, Jr.

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