US1084610A - Railway signaling system. - Google Patents

Description

W. J. COOK & S. DEUTSOH.

RAILWAY SIGNALING SYSTEM. APPLICATION FILED AUG. 2'9, 1911.

1,084,6 1 Patented Jan. 20, 1914.

3 SHEETS-SHEET 1.

I [724)672ZOP8: %inesses:- V/z'ZZz'am J. 000k W. J. COOK & S1 DEUTSGH. RAILWAY SIGNALING SYSTEM. 111111011 1011 FILED AUG. 29, 1911.

1 ,084,61 0. Patented Jan. 20, 1914.

3 SHEETS-SHEET 2.

CDLUMBIA PLANOGRAPH COqWASHINGTON. D. c,

W. J. COOK (S1: S. DBUTSGH. RAILWAY SIGNALING EYSTBM.

APPLICATION FILED AUG. 29, 1911.

Patented Jan. 20, 1914.

3 SHEETS-SHEET 3.

- W ZWaQ/M COLUMBIA PLANOGRAPH CD-JVASHINOTON, D. C.

UNITED STATES PATENT OFFICE.

ILLINOIS, ASSIG'NORS TO THE COOK RAILWAY SIGNAL COMPANY, OF IDEN'VER, COLORADO, A CORPORATION OF COLORADO.

RAILWAY SIGNALING SYSTEM.

Specification of Letters Patent.

Patented Jan. 20, 1914..

To all whom it may concern Be it known that we, WILLIAM J Coon and SIMON DEU'ISOH, citizens of the United States, residing at Denver, Colorado, and Chicago, Illinois, respectively, have invented certain new and useful Improvements in Railway Signaling Systems and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

Our invention relates to improvements in electric block signaling systems.

Our object is to provide a simple, convenient and eflicient construction for displaying proper signal indications whenever a train enters or leaves a block signaled section of the track. This construction includes means whereby a circuit is normally closed through an electromagnet and intermittently closed through an electric motor, whereby the semaphore arm is moved to the safe position as soon as a train leaves the block, mechanism being provided whereby the motor circuit is broken as soon as the signal arm is raised to the said position, while the circuit remains normally closed through the electromagnet, whereby the signal mechanism is locked in the safe position. As soon, however, as a train enters a block, a circuit, which is normally closed through a relay for maintaining the electromagnet in the energized condition, is short circuited, whereby the relay is deenergized and the circuit broken through the electromagnet, allowing the armature to fall whereby the mechanism which supports the signal arm in the safe position is unlocked and the said arm, which is counterbalanced to fall, allowed to assume the danger position. Provision is also made for automatically retarding the fall of the said arm to prevent its sudden downward movement and consequent jar of mechanism.

7 At the same time that the signal arm assumes the danger position, a circuit is closed through a red or dangerlamp, thus displaying two forms of signal, one being the semaphore arm and the other the red or danger light. v

Having briefly outlined our improved construction, we will proceed to describe the same in detail, reference being made to the accompanying drawing, in which is illustrated an embodiment thereof.

In this drawing: Figure 1 is a view,

7 chiefly in elevation, of our improved signalmg apparatus shown on a small scale.

2 1s a view of the upper part of the apparatus, illustrating the semaphore arm in its two positions of danger and safety, the signal lamps being also illustrated, the parts being shown on a larger scale than in Fig. 1. Fig. 3 is a detail view in elevation of the mechanism shown in Fig. 2, viewed in the direction of the arrow in the last-named figure. Fig. 4 is a view in elevation of the operating parts of our improved construction, being a view looking in the direction of the arrow in Fig. 5. Fig. 5 is a view taken at right angles to Fig. 4, the parts being shown in elevation. Fig. 6 is a view similar to Fig. 5, and illustrating the same mechanism, but showing parts in different relative positions. Also in this view, the electrical circuit is illustrated, a section also of the blocked track being shown.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate a post or upright structure carrying the entire operating parts of our improved apparatus. The structure 5 may be said to consist of four sections, viz., the lower or base section 6; a section 7 immediately above the section 6 and carrying the operating mechanism illustrated in Figs. 1 to 6, inclusive; a tubular section 8 immediately above the section 7; and a top section 9 above the section 8 and suitably connected therewith. As illustrated in the drawing, the section 7 consists of a casing whose lower extremity is provided with a socket 10, adapted to receive the upper extremity of the base section 6, the latter being fashioned to fit snugly therein. The upper extremity of the casing 7 is also provided with a similar socket 12 into which .the lower end of the hollow post section 8 whereby it may be easily packed in small compass for transportation, either by railway or otherwise. This particular arrangement, however, is not, by any means, essential to the invention, but is explained for the purpose of indicating in a general way that the mechanism is well adapted for facilitating its transportation fro-m place to place.

Referring now to the essential features of the invention, let the numeral 16 designate a section or block of the railway track, the said section being insulated, as shown at 17, from other sections or blocks. The rail members 18 and 19 of the block 16 are respectively connected with the poles 20 and 21 of an electrical source 22, (which, as illustrated in the drawing, is an alternating current generator), by means of conductors 23 and 24. This generator supplies current to a relay 25, suitably arranged along the track, one terminal of the coil 27 of which. is connected with the rail member 19 of the block by a conductor 26, while the other terminal of the coil is connected with the rail member 18 by a conductor 28. The core 29, or movable member of the relay, is provided at its outer or lower extremity, (since it is assumed that it will be vertically arranged), with a bar 30, forming a T-shaped structure, the said bar being normally held in engagement with two contacts 31 and 32, which are bridged by the bar when the relay is energized, or when the circuit is closed through its coil 27.

When the bar 30 of the relay core is raised to the dotted line position in Fig. 6 and the contacts 31 and 32 bridged, as aforesaid, the circuit is closed through a generator 33 in the following manner: From the contact 32 a wire 34 leads to one pole 35 of the generator, while a wire 36 leads from the other pole 35-} of the generator to a green or safe light G, carried by the top member 9 of the structure 5. From this light G, a wire 37 leads to a conductor 38, which it joins at a point 39, from which point the circuit is completed through the wire 38 through the contact 31, the bar 30, the contact 32, and a conductor 39, which is connected with the pole 35 of the generator 33. Hence, when the bar 30 is in the normal or dotted line position in Fig. 6, the circuit is closed through the green or safe light. It is also closed temporarily through a motor 40 and continuously through an electromagnet 41, while the bar is in the same position, the electrical connections being as follows: From a point 42 on the wire 36 a conductor 43 leads to the motor 40, being connected therewith at a point 44, while, from a point 45, a conductor 46 leads to a contact 47 which is normally engaged at one extremity by a pivoted bar 48, constituting an electrical conductor, from which bar a wire 49 leads to a terminal 50of the electromagnet 41, from which point the 'motor circuit is completed through the conductor 38, the contact 31, the bar 30 of the relay core, the contact 32, and the wire 39 to one pole of the generator 33. The circuit is completed through the coils of the magnet 41 as follows, assuming that the bar 30 is in the dotted line position: From a point 51 on the wire 36 a conductor 52 leads to a terminal 53 of the said magnet, while from the opposite terminal 50 of the mag- -net-, the circuit is completed in the same mannervas from the same point through the motor, viz., by way of the conductor 38, the contact 31, the bar 30, the contact 32, and the wire 34, to the pole 35 of the generator 33.

Referring to Fig. 6 of the drawing, let the numeral 54 designate a train located in the block 16. For convenience of illustration,

this train is conventionally illustrated by means of metal wheels 55 and a metal axle 56, whereby the track rail members 18 and 19 are bridged and the current from the lgenerator 22 short circuited, thus breaking the circuit through the coil of the relay 25, whereby its core is allowed to drop, its bar 30 engaging two contacts 57 and 58, the said contacts being bridged by the metallic bar. In this event, it will be evidentthat the circuit is broken through the electromagnet 41 and through the motor 40, whereby an armature bar 59 is allowed to drop and the signal arm allowed to fall to the danger position, by virtue of mechanism hereinafter more fully explained in detail. At the same time that the semaphore arm falls to the danger position, the circuit is broken through the green or safe light and closed through the red or danger light, the latter condition being effected in the following manner: the current from the generator 33 may be said to pass from the pole 35.; through the wire 36 to a point 60 thereon, from which point a wire 61 leads to the red lamp It, from which lamp a wire 62, (see Figs. 2 and 6), leads to the contact 57, from which the circuit is completed through the bar 30, the contact 58, a short conductor 63, and the conductor 34 to the opposite pole 35 of the generator. In order to control the rise and fall of the semaphore arm, or its movement to the safe and danger posit-ions, respectively, certain mechanism is essential, and this will now be described. A shaft 64 is journaled in the casing 7 and upon it is mounted and made fast a grooved pulley 65 with which one extremity of a flexible device, 66, (in this instance, illustrated as a chain), is secured as shown at 67, while its opposite extremity is connected with a quadrant 68, connected with the semaphore arm 69 on the opposite side of a pivot 70 of said arm. From this, it will be understood that, as the said pulley is turned in one direction, the semaphore arm will be it is allowed to pass below a shaft 76 upon which a gear 77 and a worm wheel 78 are mounted and made fast. The lever arm 73 is connected by means of a link 79 with one extremity 80 of the armature bars .59 of the electromagnet 41. This connection between the link and the lever arm 73 is made through the medium of a pin 81, passing through a slot 82 formed in one end of the link. By virtue of this connection and arrangement, when the armature bar is raised through the influence of the energized magnet 41 upon the soft iron member 83, the pinion 72 is thrown into mesh with the large gear 71, whereby an operative connection is formed between the motor 40 and the said' gear through the instrumentality of a worm 84, engaging the worm wheel 78 and the gear 77, which meshes with the pinion 72. The worm 84 is carried by a shaft member 85 journaled in the casing or frame structure 7 and coupled, as shown at 86, with the armature shaft 87 of the motor.

In order to positively sustain the armature bar 59 and its connections in the raised position, whereby an operative connection is established between the motor and the gear 71 for rotating the latter and raising the semaphore arm to the safe position, aspringactuated pawl 88 is pivotally connected, as shown at 89, with one extremity of the lever arm 73, the said pawl being acted on by a spring 90, whereby it is adapted to be thrown into engagement with one extremity 91 of a bar 92, pivoted at 93. The extremity of the bar 92, opposite the extremity 91, is equipped with a bolt 3, adapted to be engaged by a projection 94 formed on an arm 95 fast on a rock shaft 96, to which one extremity of the armature bar 59 is also made fast. When the armature bar is raised, through the influence of the energized net 41, the hooked extremity of the pawl 88 is brought into interlocking engagement with the extremity 91 of the bar 92 and simultaneously the projection 94 of the arm 95 is brought into engagement with the head of the bolt 3, occupying the position above the latter, whereby the bar 92 is locked in the horizontal position and made to sustain the lever arm 73 in the position to maintain the pinion 72 in mesh with the large gear 71. It Will be understood that this looking mechanism is essential, since the influence of the magnet 41 would not be suflicient to maintain the pinion 72 in operative'engagement with the gear 71, during the operation of the latter for the purpose of raising the semaphore arm to the safe position. While the semaphore arm is moved to the safe position through the power of the motor 40, as soon as the magnet 41 is deenergized and the armature bar released, the weight of the semaphore arm 69, which is counterbalanced to fall, will be suflicient to reverse the operating mechanism composed of the pulley 65, the gear 71 and the shaft 64; and, in order to prevent the arm from falling suddenly, whereby the mechanism might be subjected to injury by the resultant concussion or jar, we have provided retarding means consisting of a ratchet wheel 97, composed of two members 98 and 99, which are connected by clamping bolts 100, whereby the ratchet is clamped to a collar 101, with which the shaft 64 is provided, the clamping condition being sufiicient to produce the necessary friction between the ratchet wheel and the collar of the shaft to retard the rotation of the shaft incident to the falling movement of the semaphore arm, the said ratchet wheel being locked against rotation in the direction of the shafts rotary movement at such time by a pawl 102, pivoted on the stationary framework of the casing 7, as shown at 103.

In order that the electromagnet 41 may be relieved of the resistance offered by the weight of the load incident to the raising of the semaphore arm to the safe position, when moving the pinion 72 into mesh with the gear 71, the last-named gear is provided with a pin 104, which enters a curved slot 105 formed in the pulley 65, the arrangement being such that this pin, when the semaphore arm is in the lower or danger position, is in one extremity of the said slot and is allowed to travel to the other extremity of the slot before the operating mechanism will take up the said load, and during this interim, between the starting of the motor and the taking up of the load, the pinion 72 is brought into meshing relation with the gear 71 and the parts are secured in the locked position by the auxiliary looking means. It will be understood that, as the pulley 65 is fast on the shaft and the gear 71 loose thereon, the operating mechanism will not take up or act upon the load until the gear wheel 71 is turned sufliciently to bring the pin 102 to the opposite extremity of the slot 105 of the pulley. The gear wheel 71 is provided with two lugs or projections 106 and 107, which are arranged on the said wheel about ninety (90) degrees apart. The mechanism is so constructed and arranged, as illustrated in the drawing, that the gear wheel 71 moves approximately three-fourths of a revolution during the raising and falling operations of the semaphore arm, the said movements, of course, being in reverse directions during the two opera tions of the semaphore. When the motor is operated to raise the semaphore arm and the gear 71 has been turned approximately three-fourths of a revolution, the lug 107 will engage one extremity of the pivoted arm 48 and actuate the latter to disengage the opposite extremity of the said arm from the cont-act 47, thus breaking the motor circuit and stopping the motor; while, during the opposite movement of the gear wheel 71, incident to the falling of the semaphore arm, to the danger position, the lug 106 is brought into engagement with the same extremity of the pivoted arm but moving in the opposite direction, whereby the position of the said arm is reversed and the motor circuit closed at this particular location. At this time, however, the motor circuit is broken at another point, viz., by the falling of the bar 30, incident to the breaking of the circuit through the coil 27 of the relay 25.

From the foregoing description, the operation of our improved apparatus will be readily understood. Assuming that the operating parts are in the normal position, incident to the energizing of the magnet 41, due to the closing of the circuit through the coil 27 of the relay 25, the armature bar will be raised to the position illustrated in Fig. 5, whereby the pinion 72 will be brought into mesh with the gear 71 due to the lifting of the arm 73 and its connections, as heretofore explained. Now, if we assume that a train 54 enters a block 16, the current supplied by the generator 22 will be short circuited through the wheels and axle of the said train, whereby the circuit will be broken through the coil 27 of the relay 25 and its core allowed to fall, whereby the bar 30 is brought into engagement with the contacts 57 and 58 bridging the space between them. In this event, the circuitwill be broken through the safe or green light G, and closed through the red or danger light R in the following manner: Starting at the pole 35-}- of the generator 33, the current may be said to pass through the conductor 36 to a point 60, thence through a conductor 61 to the red light, thence through a conductor 62 to the contact 57, thence through the bar 30 to the contact 58, thence through the short conductor 63 to the conductor 3% to the opposite pole 35 to the generator 33, completing the circuit. At the same time, the circuit is broken through the magnet 41, allowing the armature bar 59 and its connections to fall to the position illustrated in Fig. 6, whereby the pinion 72 is disengaged from the gear 71, thus virtually unlocking the said gear and allowing the semaphore arm to fall. During this falling operation,the pulley 63 is rotated in the direction indicated by the arrow B, the gear 71 being also actuated by virtue of the fact that its pin 102 engages the extremity of the slot 105 of the pulley, as indicated in Fig. 6, and it is by virtue of this construction and arrangement that the locking of the gear 71, by virtue of its meshing relation with the pinion 72, also serves to lock the pulley 65 against rotation in the direction of the arrow B, or in the direction to allow the semaphore arm to fall when the latter is in the raised or safe position. In order that the pin 10% may normally remain in the proper extremity of the slot 105, in order that the mechanism may operate, as heretofore described, the gear wheel 71 is provided with an integral weight or enlargement 108, so arranged that, as soon as the semaphore arm falls to the danger position, whereby the pin 10% would, at the end of such falling movement, be in the extremity 109 of the slot 105, (see Fig. 5) ,the gear 71 will automatically move in the direction of the arrow B,- (see Fig. 5),sufficiently to cause the pin 10% to engage the opposite extremity 110 of the said slot. By virtue of this arrangement, it will be understood that, when the motor circuit is closed, in order to raise the semaphore arm to the safe position, in which event the gear 71 must be rotated in a direction opposite that indicated by the arrow B, the gear will be allowed to move a distance equal to the length of the slot 105 before it will take up the load incident to the raising of the said arm. .After the semaphore arm has fallen to the danger position, and the red or danger light has been dis played, incident to the entrance of a train 5 1 to a block 16, it will be understood that, as soon as the train leaves this block, the circuit will be closed through the coil of the relay 25, and the bar 30 of the core raised to the dotted line position in Fig. 6, whereby the circuit is closed through the motor and the magnet 41, with the result that the armature bar 59 will be raised to the position shown in Fig. 5, and the pinion 72 brought into mesh with the gear 71, whereby the said gear is rotated in a direction opposite that indicated by the arrow A in Fig. 6, with the result that the pulley 65 is also rotated in the same direction, its

movement, however, not commencing until the gear 71 has traveled a distance equal to the length of the slot 105. lVhen the gear 71 has moved a suflicient distance to raise the semaphore arm, the pin 107 will engage the pivoted arm 18 and break the motor circuit, as heretofore explained. -This stops the operation of the gear 71 and the pulley 65, and it does not break the connection between the pinion 72 and the gear 71 by virtue of which the semaphore arm is locked in the raised position until such time as the circuit is broken through the magnet 41 incident to the entrance of a train in a block 16, as heretofore described.

Attention is called to the fact that it is by virtue of the worm gear element of the means for operating the signal arm that the latter is locked against falling when in the safe position, since, if the ordinary spur gear mechanism were employed in connection with the shaft of the motor, the retard ing action of the gears would not be suflicient to support the signal arm in the raised or safe position, the said arm being weighted to fall as heretofore explained. In this connection, it may be stated that the retarding action of the ratchet collar 97 acts upon the shaft in one direction only, viz., during the rotation of the shaft in response to the falling movement of the arm. During the operation of raising the signal arm, the said ratchet collar is free to rotate with the shaft, the locking pawl 102 being arranged in connection wit-h the teeth of the ratchet to permit this result. Attention is further called to the fact that in our improved mechanism the safe and danger lights are not controlled in any way by the movement of the semaphore arm, but are displayed and extinguished independently of the arm. This is an important feature by reason of the fact that, if the mechanism for operating the semaphore armwere out of order, whereby the said arm would not properly perform its function, the safe and danger lights would continue to be controlled in exactly the same way as if the operating mechanism for the semaphore arm were properly performing its function.

Having thus described our invention, what we claim is:

1. In railway signaling apparatus, the combination of an electrical circuit, a blocked track, the rail members of a block being in the circuit, a relay in the block circuit adapted to be deenergized by the short circuiting of the current due to the presence of a train in the block, a second circuit normally closed by the relay, electromagnetic means located in the second circuit and normally energized, a signal driving mechanism and means for actuating the same to cause the signal to assume the safe position, means for'locking the mechanism in position to maintain the signal in the same position, the locking means being arranged to be thrown to the locking position by the electromagnetic means, and auxiliary locking means initially actuated by the electromagnetic means for maintaining the locking means in the locked position in addition to the direct action of the electromagnetic means.

2. In railway signaling apparatus, the combination of a circuit, a blocked track, the rail members of the block being in the circuit, a relay in the block circuit, adapted to be deenergized by the short circuit of the current, due to the presence of a train in the block, a second circuit normally closed by the relay, electromagnetic means located in the second circuit and normally energized, a signal, means for actuating the signal to cause it to assume the same position, comprising a motor, a gear actuated by the motor, a second gear out of mesh with the motor gear, an interposed gear constantly in mesh with the motor gear, a movable element upon which the interposed gear is mounted, an operative connection between the armature of the electromagnetic means and the said element to cause the interposed gear to mesh with the second gear when the electromagnetic means is energized, and auxiliary means initially actuated by the electromagnetic means for maintaining the meshing relation between the interposed gear and the second gear.

' 3. The combination with a signal, of means for actuating the same to cause it to assume the safe position, said means including a motor, a gear actuated by the motor, a second gear out of mesh with the motor gear, a third gear interposed between the motor gear and the second gear and normally in mesh with the motor gear, a movable element upon which the third gear is mounted, said element normally having a tendency to maintain the third gear out of mesh with the second gear, electromagnetic means connected in operative relation with the said element to actuate the same to throw the third gear into meshing relation with the second gear, and auxiliary means initially actuated by the electromagnetic means for maintaining the meshing relation between the second and third gears in addition to the direct action of the electromagnetic means, said auxiliary means including a pawl carried by the said movable element, a pivoted bar arranged to be engaged by the pawl on one side of its pivot, and an arm actuated by the electromagnetic means to cause it to engage the said bar on the opposite side of its pivot, whereby the bar is locked to maintain the third gear in operative relation with the second gear during the operation of moving the signal to the safe position.

4:. The combination of a signal arm weighted to fall, means for raising the said signal to the safe position, including a motor, an operating connection between the motor 129 and the signal including a movable element normally having a tendency to interrupt the operation, electromagnetic means for causing said movable element to take the operative position, and means initially actuated by the electromagnetic means for maintaining the movable element in the operative position in addition to the direct action of the electromagnetic means.

5. The combination of a signal arm weighted to fall, means for raising the signal to the safe position, including a motor, a movable element directly connected with the signal, a second movable element adapted to be operated by the motor, an operative connection between the two movable elements to allow the element operated by the motor an initial movement before the element connected with the signal begins to move, and means for automatically returning the second movable element to its normal position after the signal has assumed the danger position.

6. The combination of a signal arm weighted to fall, and means for raising the signal to the safe position, including a motor, 1

a wheel adapted to be connected in operative relation with the motor, a second whee-l connected with the signal, a connection between the two wheels to permit an initial movement of the first wheel before the second wheel begins to move, and means for automatically returning the first wheel to its normal position, after the signal has assumed the danger posit-ion.

7. The combination of a signal arm weighted to fall, means for raising the signal to the safe position, including a motor, a wheel adapted to be connected in operative relation with the motor, a second wheel connected with the signal, a connection between the two wheels to permit initial movement of the first wheel before the second wheel begins to move, the first wheel being weighted to return it to its normal position after the signal has assumed the danger position.

8. The combination of a signal arm weighted to fall, means for raising the signal t0 the safe position, including an electric motor, a wheel adapted to be connected in operative relation with the motor, a second wheel connected with the signal, both wheels being mounted to rotate upon the same axis, a connection between the two wheels to permit initial movement of the first wheel before the second wheel begins to move, the first wheel being weighted to return it to its normal position after the signal has been raised to the safe position, and means actuated by the first wheel for break: ing the motor circuit after the signal has assumed the danger position.

9. The combination of a signal arm weighted to fall, means for raising the sig nal to the safe position, including an electric motor, a wheel adapted to be connected in operative relation with the motor, a second wheel connected with the signal, both wheels being mounted to rotate upon the same axis, a connection between the two wheels to permit initial movement of the first wheel before the second wheel begins to move, means actuated by the'first wheel for breaking the motor circuit after the signal has been raised to the safe position, and means for restoring the first wheel to its normal position with respect to the second wheel after the falling of the signal.

10. The combination of a signal arm, a motor, mechanism adapted to operatively connect the motor and the signal including amovable element normally having a tendency to interrupt the operation, electromagnetic means for causing the movable element to take the operative position, and means initially actuated by the electromagnetic means for maintaining the movable element in the operative position in addition to the direct action of the electromagnetic means.

11. The combination of a signal arm,

means for moving the said arm to a predetermined position, including a motor, a movable element directly connected with the signal, a second movable element adapted to be connected with the motor, an operative coninection between the two movable elements 3 to allow the element connected with the moltor an initial movement before the element iconnected with the signal begins to move, and means for automatically returning the fsecond movable element to its normal posiltion, after the signal has been moved to the predetermined position. l 12. The combination of a signal arm, lmeans for moving the said arm to a predetermined position, including a motor, a ljwheel adapted to be connected in operative f relation with the motor, a second wheel connected withthe signal, and a connection beftween the two wheels to permit the initial movement of thefirst wheel before the sec- ;ond wheel begins to move, said connection comprising a pin on one wheel entering a 1 slot in the other wheel.

13. The combination of a signal arm, -means for moving the said arm to a p'rede termined position, including a motor, a wheel adapted to be connected in operative relation with the motor, a second wheel connected with the signal, a connection between the two wheels to permit initial movement of the first wheel before the second wheel begins to move, the first wheel being weighted to return it to its normal position after the signal has been moved to the predetermined position, and means actuated by the first wheel for breaking the motor circuit after the signal has been moved to the predetermined position.

14. The combination with a signal, of means for actuating the same to cause it to assume a predetermined position, including a motor, a gear actuated by the motor, a second gear out of mesh with the motor, a third gear interposed between the motor gear and the second gear and normally in mesh with the motor gear, a movable element upon which the third gear is mounted and normally having a tendency to maintain I the third gear out of mesh with the second gear, electromagnetic means connected in operative relation with the said element to actuate the same to throw the third gear into mesh with the second gear, and auxiliary means initially actuated by the electromagnetic means for maintaining the meshing relation between the second and third gears in addition to the direct action of the electromagnetic means, substantially as described.

15. In combination, a signal arm, mechanism for raising said arm including a removable gear electromagnetic means for 15 moving said gear into operative position and retaining it there, auxiliary means for look ing said gear in the last named position after it has been moved by the electromagnetic means, and means whereby the movement of the signal arm by said mechanism is postponed until after the auxiliary locking means is set.

In testimony whereof, We affix signatures in presence of two witnesses.

WILLIAM J. COOK. SIMON DEUTSCH.

WVitnesses A. J. OBRIEN, C. E. BRADEN.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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