US1014966A - Apparatus for governing the passage of cars or vehicles along a railway and the control thereof. - Google Patents

Description

ILWAY J. s. HOLLIIDAIY;

APPARATUS FOR GOVERNING THE PASSAGE OE CARS 0R VEHICLES ALONG A RA AND THE CONTROL THEREOF. APPLICATION FILED 00T..26, 1910.

Patented Jan. 16, 1912.

4 SHEETS-SHEET 1.

J2 J4 J3 WITNESSES:

COLUMBIA PLANOGRAPH c0.. WASHINGTON, D cv J. S. HOLLIDAY. APPARATUS FOR GOVERNING TH E PASSAGE 0F CARS 0R VEHICLES ALONG A RAILWAY. AND THE CONTROL THEREOF. 1,014,966.

APPLIOATION FILED OOT.26, 1910.

Patented Jan. 16, 1912.

4 SHEETSSHEET 2.

m llv COLUMBIA PLANOGRAPH CO-.WASHINGTON, b t;

J. S. HOLLIDAY. APPARATUS FOR GOVERNING THE PASSAGE 0F CARS 011 VEHICLES ALONG A RAILWAY AND THE CONTROL THEREOF. APPLICATION FILED 00T.26, 1910.

IGtented Jan. 16,1912.

4 SHEETS-SHEET 3.

WIT/7 INVENTOR COLUMBIA PLANCIGRAPH cc.. WASHINGTON, 11.1;

J. S. HOLLIDAY. APPARATUS FOR GOVERNING THE PASSAGE 0P CABS OR VEHICLES ALONG A RAILWAY AND THE CONTROL THEREOF. APPLICATION FILED 00T.26, 1910.

1"? 4 SHEETS-SHEET 4.

WITNESSES:

Patented Jan. 16, 1912.

' UNITED STATES PATENT orrion- JOHN S. I-IOLLIDAY, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO THE UNION SWITCH & SIGNAL COMPANY, OF SWISSVALE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

APPARATUS FOR GOVERNING THE PASSAGE OF CARS OR VEHICLES ALONG- A RAILWAY AND THE CONTROL THEREOF.

Specification of Letters Patent.

Patented Jan. 16,1912.

Application filed October 26, 1910. Serial No. 589,106.

and the Control Thereof, of which the following is a specification.

My invention relates to apparatus for governing the passage of cars or vehicles along a railway, and the control thereof, and particularly to that class of apparatus in which alternating current is used as operating power for alternating current motors comprised in the apparatus.

In the accompanying drawings, Figure 1 is a view showing a plan of a railway switch, and an operating mechanism therefor embodying my invention. Fig. 2 is a view showing a side elevation, partly in section, of the apparatus shown in Fig. 1. a view showing in side elevation, partly sectioned, a circuit controlling device used for controlling the circuits of an electric motor comprised in the switch operating mechanism shown in Figs. 1 and 2. Fig. 4 is a view showing in end elevation the circuit controlling device illustrated in Fig. 3. Figs. 5 and 6 are side and end elevations respectively of an indication device comprised in an apparatus embodyingmy invention. Fig. '7 is a view showing diagrammatically the apparatus and controlling circuits for a switch operating mechanism embodying my invention.

Similar reference characters refer to similar parts throughout the several views One feature of my invention is the use of a two phase alternating current generator and an alternating current motor' having two separate-windings, each winding being connected respectively with one phase of current from the generator while the motor;

is operating the switch.

Another feature of my invention is an indication device which is operated when the switch has moved to one or the other of its limiting positions, by disconnecting one.

Fig. 3 is ence character 51 designates an alternating current electric motor employed to operate a railway switch 55 through the medium of a clutch 52, a reduction gearing 54 and a cam device 53. These intermediate mechanical parts are elements of a well-known switch and lock movement which it is unnecessary to describe in detail here. They are fully set forth in United States Letters Patent 7 62,997 granted to M. D. Hanlon on June 21, 1904 except that the clutch 52 instead of being of the electromagnetic type described in that patent is here shown as being of a mechanical type, such for example as the clutch shown in United States Letters Patent No. 870,912 granted to John D. Taylor on November 12th, 1907. I do not desire, however, to limit myself to this particular type of switch and lock movement, as my in in detail in Figs. 3 and 4, and diagrammatically in Fig. 7.

Referring now toFigs. 3 and 4:,the numerals 33 and 34 designate the front and back plates respectively of a supporting frame suitably mounted upon a base plate 40. A and A are two armatures of laminated soft iron rigidly mounted between the plates 33 and'34, and C and G are two cores pivotally mounted at the points ll between the same plates. Coils Y and Y are wound respectively on the pivoted cores 0 and C The cores C and C are operatively connected respectively with two bars R and R which interlock with each other at the point 16. M is a rocking frame pivotally mounted between the plates 33 and 34:, and carrying at the extremities of its two arms contact bridging pieces S and S The bridging piece S is adapted to bridge across either a pair of contact fingers 58 or 59, depending upon which direction the frame M is rocked, while the bridging piece S is similarly adapted to bridge across either a pair of contacts 56 or 57. The frame M is normally held in its middle position out of engagement with any of the contacts by springs 39. Secured to the bars R and R are shoulders T and T which engage respectively with dogs 35 and 36 on the frame M and by means of which the frame M is rocked in one direction or the other from its middle position by the closing of either core C or C against its armature A or A The closing of these cores against their armatures is effected by the passage of electric current through the coils Y and Y 42 designates a driving bar which is moved longitudinally by the cam 53, as indicated in Fig. 2. As is well understood, this driving bar is moved through a portion of its stroke before the switch rails are moved, and through the remainder of its stroke in the same direction after the switch rails have completed their movement. Secured to this driving bar 42 are two dogs 30 and 31, which operate respectively two rocking cams H. and H as clearly indicated in Fig. 3. Pivotally mounted on the same shafts as the rocking cams H and H are two arms F and F which carry at their upper ends bridging contact pieces adapted to make electrical connections with pairs of contact fingers 82 and 83 respectively. These bridging pieces are normally out of contact with the fingers 82 and 83 when the rocking cams are in the position of cam H, but they are moved into contact with the fingers when the rocking cams move into the position of cam H WVith the parts in the positions shown in Fig. 3, the next movement of the driving bar 42 will be in the direction indicated by the arrow. An auxiliary means is also provided for moving the arms F and F 2 into engagement with their contact fingers, comprising bars E and E which are loosely connected, respectively, with arms D and D which latter are rigidly secured to the cores C and C respectively. hen the core C is closed against its armature A, the bar E will rotate the arm F against the action of a spring 1 into engagement with the contact springs 82.

An auxiliary means is provided for moving the bars R and R by the rocking movements of the rocking cams H and H Rigidly secured to the rocking cam H is an arm B which is connected with a piston K operating in a dash-pot N. This dash-pot is mounted in the framework to move freely in a longitudinaldirection, and carries at its closed end a rod 84 which engages the bar R. The dash-pot N is held normally in its lowest position by a spring P, one end of which rests against a lug 86 on the frame plate 34. The dash-pot N carries a shoulder 37 which engages a contact spring Q,

moving the latter out of contact with a finger V and into contact with a finger U when the dash-pot is moved upwardly by the action of its piston. The construction of dash-pot N and its connections is similar to that just described for dash-pot N. The action of these dash-pots is as follows: When the driving bar 42 moves through its full stroke in the direction indicated by the arrow, the rocking cam H will be moved to its opposite position, causing the piston K to compress the air in the dash-pot N and thereby to move the dash-pot upwardly against the action of the spring P The bar R will, therefore, be moved upwardly, rocking the frame M to make bridging contacts across fingers 56 and 59. The bar R is slotted to permit of this movement without closing the core C against its armature. The parts will remain in this position until the compressed air in the dash-pot has been expelled by the action of spring P when the dash-pot will be moved downward, and the bar R and rocking frame M will return to their normal positions. The dash-pot N acts in a similar manner to operate the frame M in the opposite direction. These dashpots and their pistons are preferably so constructed that the process of expelling the air shall consume only a few seconds of time.

It should be noted that the bars R and R are so interlocked at the point 16 that, when the rocking frame M is rocked in one direction by the upward movement of one of the bars R or R should the other of these bars he accidentally moved upward, both of the shoulders T and T will be removed from engagement with the dogs 35 and 36, and the rocking frame M will return to its middle position, opening all contacts controlled by this frame.

Referring now to Figs. 5 and 6, I have herein shown a form of indication device embodied in my invention. 49 designates a soft iron yoke having an inwardly projecting soft iron tongue 73, upon which tongue is wound a coil 43. 44 is a coil of solenoid construction through the center of which passes a soft iron plunger 48. This plunger 48 is free to move vertically and is guided by non-magnetic guides 90 and 91 passing through holes in the upper and lower branches of the yoke 49. Surrounding the solenoid coil 44 is a soft iron shell 68 which is magnetically, as well as mechanically, connected with the tongue 73. It will be seen from the construction of this device that when currents pass through the two coils in one relative direction the plunger 48 will be magnetically attracted toward the lower branch of the yoke 49, while, when the currents in the two coils are in the opposite relative directions, the plunger will be magnetically attracted toward the upper branch of the yoke 49. 60 designates a terminal serves as an additional support for the shell.

68 and solenoid coil 44.

It is evident from the foregoing description that if either one of the windings 43 or 44 should by accident become short-circuited, any current flowing in the remaining winding would hold the plunger 48 in its lowest position; hence there is no possibility of a false indication due to such fault, and the fault would be detected at once owing to the fact that the system would be rendered inoperative.

Referring now to Fig. 7, the reference character A designates an interlocking machine circuit controller, of which several types are well known in the art. As here shown the operation of the controller is as follows: A pivoted lever is connected through a link 28 with a bar carrying contact blocks 45 and 46. A latch 22 carried by the lever 20 operates a segmental link 21 which in turn is connected with a usual form of mechanical locking apparatus by-a bar 23. This mechanical locking apparatus controls the movements of the lever 20 by means of the engagement of a dog 62 on the latch 22 with notches in a quadrant 24 in the usual manner. Another bar 26 which is operatively connected with the link 21 prevents a complete movement of the latch 22 and of the mechanical locking apparatus until an indication of a complete movement of the switch has been received by the raising of a dog 27 which falls into a recess 29 in the bar 26. This dog is raised by the armature of a magnet L, the circuit for which is controlled by the plunger 48 of the indication device I hereinbefore described. l/V and W are two windings of the alternating current switch motor 51 which is comprised in the switch-operating mechanism. G designates a two-phase alternating current generator having phases G and G and employed to furnish power for the operation of this motor. The phases G and G of this generator are approXimately in quadrature. Z designates a circuit controlling device illustrated in detail in Figs. 3 and 4 and described hereinbefore. X and X designate reactances used to affect the phase of the currents generated by the generator G, as hereinafter explained.

The operation of the system illustrated in Fig. 7 is as follows: When the controlling lever A is reversed to the position indicated by dash lines, the contact blocks 45 and 46 are moved to the positions also in dicated by dash lines. Current from phase G of the generator G then flows through wire 9, coil 44, wire 10, contact block 45,

wires 3 and 4, coil Y, wire 5, contact finger V, contact spring Q, wire 6, contacts 83, wires 8 and 2 to phase G of generator G.

This current energizes coil Y and causes the core G to be closed against its armature A, raising bar R and closing contacts 82 by means of arm F. The shoulder T on bar R engages dog 35 on frame M, rotating this frame to close the contact points 57 and 58 by means of bridging contact pieces S and S respectively. A portion of the current from phase G then flows from wire 3 through wire 7, contact points 58, motor winding W", wire 2 back to phase G of generator G. Current from the phase G of the generator flows through wires 65 and 50, contacts 57, motor winding 7 wire 2 to phase G. The two windings and of the two-phase motor 51 are thus energized by current from the two-phase generator G, and the motor rotates in the prop-er direction to move the switch. Before the movement of the switch rails begins, the driving bar 42 is moved through a portion of its stroke, in the direction of the arrow, swinging the dog H to its opposite position and thereby holding arm F in position to close contact-s 82 independently of the action of core C and rod E. At the completion of the movement of the switch rails, the driving bar 42 is moved through the remainder of its stroke in the direction of the arrow, swinging the dog H to its opposite position and thereby opening the contacts 83 by means of arm F The opening of contacts 83 opens the circuit through coil Y, and the core C therefore opens allowing the frame M to swing back to its middle position. The movement of dog H also causes the piston K to compress the air in dash-pot NF, moving the dash-pot .upward and rotating the frame M to close contacts 56 and 59. Motor winding 1V is then connected with phase G of the generator as follows: from generator G through wires 65 and 11, contacts 59, motor winding W, wire 2 to phase G. The last-mentioned movement of the driving bar 42 also actuates the clutch 52 to mechanically disconnect the motor from the switch mechanism, in a manner explained in the hereinbefore mentioned patent to Taylor No. 870,912. Since the motor was already rotating, it will continue to rotate in the same direction as long as current is supplied to one winding. Vhile thus running on current supplied to the winding V, an alternating current is generated by the winding which flows through wire 2, coil 43, wire 13, contact block 46, wires 14 and 12, contacts 56, to winding The dash-pot being in its upper position, the contact spring Q? is moved against contact finger U3, and this allows current from phase G of the generator to flow through wire 9,coil 44,wire 10, contact block 45, wires 3, 4 and 15, reactance X contact finger U contact spring Q wire 19, contacts 82, wires 32 and 2 to phase G of the generator G. The two windings 43 and 44 of the indication device I are now supplied with alternating currents of the proper relative directions and phase to cause the core 48 to move upward, closing a circuit controller 63. This closes a local circuit through magnet L, the armature of which then raises the dog 27 out of the recess 29, thus permitting the bar 26 and the latch 22 to complete their stroke. Currents will continue to flow as just described until the spring P has expelled the air from the dash-pot N causing the latter to return to its normal position, when the frame M is allowed to swing back to its middle position, thus opening allcircuits. As was hereinbefore stated, the contacts 82 are closed by arm F when core C is closed against its armature A. The closing of these contacts permits a portion of the current from both phases of the generator G to return to this generator through the coil 43 of the indication device I, as'follows: Part of the current from phase G when it reaches wire 8, may pass through wire 32, contacts 82, wire 19, contact springs Q} and V wire 64, coil Y wires 17 and 14, contact block 46, wire 13, coil 43, wire 2 to phase G This current, although in phase with the current in coil 44 of the indication device, is in the wrong direction relative to that in coil 44, and hence, as explained hereinbefore in describing the indication device, the plunger 48 will be held in its lower or inoperative position.

A portion of the current from phase G of the generator may, after passing through motor winding pass through wires 2 and 32, contacts 82, etc, as above explained for the return current from phase G The current which thus flows from Gr through coil 43 will be nearly in quadrature with that in coil 44, for the reason that the currents in these two coils are furnished respectively by the two phases G and G of the generator, hence there will be no tendency for these currents to cooperate to raise the plunger 48 of the indication device I. These portions of the currents which return to the generator G through the branch circuit which includes winding 43 of the indication device are extremely weak, for the reason that this branch circuit includes coil Y and the winding 43, whereas the direct return path to the generator consists only of wire 2, the impedance of which is very low. The impedance of coils Y and Y is necessarily comparatively high (for the reason that one or the other of these coils is con nected directly across the full voltage of generator G during an operation of the switch) hence substantially all of the current from both phases of the generator will fiow back to the generator through the direct return wire 2. Even though these portions of the current which return to the generator through winding 43 pass also through coil Y they are, for the reason just explained, too weak to energize core C sufficiently to cause this core to close against its armature A. Vhen, however, the parts of the apparatus are in the proper positions and conditions for the operation of the plunger 48 of the indication device to release the lever A, the currents in the two coils 43 and 44 will cooperate to raise the plunger for the following reasons: The motor is being operated on current supplied to winding WV by phase G of the generator, and hence the current delivered by winding WV to coil 43 will be nearly in quadrature with that furnished by phase G. But coil 44 is supplied with current from phase G which is also nearly in quadrature with that from phase G, hence the currents in the two coils 43 and 44 are in approximately the same phase and are in the proper relative direction to raise the plunger 48. I have provided a reactance X in circuit with phase G of the generator and coil 44 during the period of indication, whereby the phase of the current furnished to coil 44 may be afiected if desired.

A movement of the switch rails in the opposite direction is accomplished in a similar manner to that just described, and need not be traced in detail. For the operation of the motor 51 during this movement of the switch rails, current from phase G of the generator is supplied first to coil Y and then to motor winding WV and current from phase G is supplied to motor winding WV. For the operation of the indication device I, the motor is operated by current from phase G supplied to winding 7 the current generated by winding W is furnished to coil 43, and current from phase G flows through coil 44.

The system just described is protected against false movements of the switch-rails in the following ways:

Protection against crosses with live wires.- Vith the parts of the apparatus in the positions shown in Fig. 7 the last operating wire 14 is left connected with phase G of the generator. If now the next operating wire 3 should become crossed with a live wire, current will flow through coil Y, causing the core C to close against its armature A as in the normal operation hereinbefore explained, and the frame M will thereby be rocked in clock-wise direction. Arm D will cause the bar E to close the contact fingers 82, and this will allow current to flow from phase G through wires 14 and 17, coil Y wire 64, contact springs V and Q wire 19, contact fingers 82, wire 2 to phase G of the generator. This current in coil Y will cause core C to close against its armature, and bar R will be raised, but since the bar R is already in raised position, the shoulder T on bar R will not en age with dog 36; also the raising of bar 2 will disengage the shoulder T on bar R from dog 35, and frame M will be allowed to swing back to its middle position. Neither winding of the motor will be supplied with current, and the switch rails will, therefore, remain unmoved.

In case the controlling wires should be disconnected at a point adjacent the switch, the switch rails moved by hand to their opposite position, and the wires again properly connected, the switch rails will automatically return to their correct position corresponding to the position of the controlling lever A. This is effected in the following manner: Assume the controlling lever A to be in the position indicated by solid lines in Fig. 7, and that the switch rails have been reversed in position by outside means. The bar 42 will then be at the opposite end of its stroke, and the cams H and H will be rocked to their opposite positions, closing contact fingers 82 and opening contact fingers 83. When the controlling wires are again connected, current from phase G of the generator G will flow through wires 14 and 17, coil Y wire 64, contact springs V and Q wire 19, contact fingers 82, wire 2 to phase G Core C will thereby be closed, and the switch rails will be moved back to their correct position as in the normal operation hereinbefore explained.

Having thus described my invention, what I claim is:

1. In combination with an apparatus for moving a part or appliance controlling the passage of cars along a railway, a two-phase alternating current motor operatively connected therewith and having two field windings, a source of two-phase alternating current, a circuit controlling lever means controlled thereby for connecting each of said windings respectively with one phase of the source of current for the operation of the part or appliance, an indication device for said lever, and means controlled by the movement of the part or appliance for connecting one of said motor windings with the indication device for controlling said indication device.

2. In combination with an apparatus for moving a part or appliance controlling the passage of cars along a railway, a two-phase alternating current motor operatively connected therewith and having two field windings, a source of two-phase alternating current, a circuit controlling lever, means controlled thereby for connecting each of said windings respectively with one phase of the source of current for the operation of the part or appliance, an indication device for said lever, and means controlled by the movement of the part or appliance for disconnecting one of said motor windings from the source of current and connecting it with the indication device for the control of said indication device.

8. In combination with an apparatus for moving a part or appliance controlling the passage of cars along a railway, a two-phase alternating current motor operatively connected therewith and having two field windings, a source of two-phase alternating current, a circuit controlling lever, means controlled thereby for connecting each of said windings respectively with one phase of the source of current for the operation of the part or appliance, an indication device for said lever, comprising two windings and aplunger, one of which windings of the in dication device is connected with one phase of the source of current, and means controlled by the apparatus after the part or appliance has been moved for disconnecting one of the motor windings from the source of current and connecting it with the other winding of the indication device.

4. In combination with apparatus for moving a part or appliance controlling the passage of cars along a railway, a two-phase alternating current motor operatively connected therewith and comprising two field windings; a source of two-phase alternating current; a circuit controlling device for the control of said motor and comprising two magnets, two movable members which members are operatively connected with the magnets and are moved in one direction or the other according to whether one or the other of the magnets is energized, contacts closed by each member for connecting one winding of the motor with either one phase or the other of the source of current according to whether such member is moved in one direction or the other by the magnets; a controlling lever, and contacts operated thereby for connecting one magnet or the other with one phase of the source of current according to whether the lever is in one position or another.

5. In combination with an apparatus for moving a part or appliance governing traflic along a railway, a two-phase alternating current motor operatively connected therewith and having two field windings, a source of two-phase alternating current furnishing currents approximately in quadrature, a circuit controlling device for connecting said phases of the source of current with the two windings of the motor respectively for the approximately the same phase for the oper ation of the plunger, one of which windings of the indication device is connected with one phase of the source of current, means operated upon the completion of the movement of the part or appliance for mechanically operating the circuit controlling device, connections controlled by such operation for disconnecting one winding of the motor from the source of current and for connecting the last-mentioned motor winding with the other winding of the indication device, the motor continuing to be operated by current supplied to its other winding.

6. In combination with an apparatus for moving a part or appliance governing traiiic along a railway, a two-phase alternating current motor operatively connected therewith and having two field windings, a source of two-phase alternating current furnishing currents approximately in quadrature, a circuit controlling device for connecting said phases of the source of current with the two windings of the motor respectively for the operation of the said part or appliance, a controlling lever means controlled thereby for governing the said circuit controlling device in its control of the motor, an indication device for said lever comprising two windings and a plunger and requiring currents of the proper relative directions and in approximately the same phase for the operation of said plunger, means operated by the apparatus at the completion of the movement of the part or appliance for disconnecting both motor windings from the source of cur rent and connecting one of the said motor windings with one winding of the indication device whereby current is supplied to the said winding of the indication device, the other winding thereof being supplied with current from the phase of the source of current which was disconnected from the other motor winding.

7. In combination with an apparatus for moving a part or appliance governing the passage of cars or vehicles along a railway, a twophase induction motor connected therewith and having two field windings, a source of two-phase alternating current connected with said motor, an indication device, and means operated by the said apparatus upon the completion of its movement for disconnecting one of the motor windings from the source of current and connecting the said motor winding with the indication device for the control of said device, the motor continuing to be operated by current supplied to its other motor windin 8. In combination with an apparatus for moving a part or appliance governing'the passage of cars or vehicles along a railway, a two-phase induction motor connected therewith and having two field windings, a source of two-phase alternating current,

each phase of which is connected respecings one of which is connected with one phase of the alternating current and means operated by the apparatus upon the completion of the said movement for disconnecting one of the motor windings from the source of current and connecting the said motor winding with the other Winding of the indication device for the control of the said device, the motor continuing to be operated by current supplied to its other windin 9. In combination with an apparatus for moving a part or appliance controlling the passage of cars or vehicles along a railway, an alternating current motor connected therewith and having two field windings, a

source of alternating current, an indication device, and means for connecting one winding of the motor with the indication device for the control of said device by the current generated in the said motor winding while the motor operates on current supplied to its other winding from the source of current.

10. In combination with an apparatus for moving a part or appliance controlling the passage of cars or vehicles along a railway,

an alternating current motor connected therewith and having two field windings, a source of alternating current, a circuit controlling lever, means controlled thereby for connecting each of the said motor windings,

with the source of current for the movement 0]": the part or appliance, an indication clevice for said lever, and means operated by the said apparatus upon the completion of a movement of the part or appliance for disconnecting one of the motor windings from the source of current and connecting the said winding with the indication device for the control of the indication device, the motor continuing to operate on current supplied to its other winding.

11. In combination with an apparatus for moving a part or appliance controlling the passage of cars or vehicles along a railway, an alternating current motor connected therewith and having two field windings, a source of alternating current, an indication device, means operated by the said apparatus upon the completion of a movement of the part or appliance for disconnecting one motor winding from the source of current and connecting the said motor'winding with the indication device for the control of said device, the motor continuing to operate on current supplied to the other motor winding,

and means for maintaining the connections of the motor windings with respectively the source of current and the indication device during a predetermined period of time.

12. In combination with an apparatus for moving a part or appliance controlling the passage of cars or vehicles along a railway, an alternating current motor connected therewith and having two field windings, a source of alternating current, an indication device, means operated by the said apparatus upon the completion of a movement of the part or appliance for disconnecting one motor winding from the source of current and connecting the said motor winding with the indication device for the control of said device, the motor continuing to operate on current supplied to the other motor winding, and means for maintaining the connections of the motor windings with respectively the source of current and the indication device during a predetermined period of time, said means comprising an air dash pot and a spring tending to expel the air from the dash pot.

13. In combination with an apparatus for moving a part or appliance controlling the passage of cars or vehicles along a railway, an alternating current motor connected therewith and having two field windings, a source of alternating current, a circuit con-- troller for connecting the said motor windings with the source of alternating current for the operation of the part or appliance, electro-magnetic means for the operation of the circuit controller, a controlling lever and contacts operated thereby for the control of the said electro-magnetic means; an indication device for the said controlling lever; means operated by the apparatus upon the completion of a movement of the part or ap pliance for operating the said circuit controller to connect one of the motor windings with the indication device for the control of said device while the motor runs on current supplied to its other winding from the said source.

14. In combination with an apparatus for moving a part or appliance controlling the passage of cars or vehicles along a railway, an alternating current motor connected therewith and having two field windings, a source of alternating current, a circuit controller for connecting the said motor Windings with the source of alternating current for the operation of the part or appliance, electro-magnetic means for the operation of the circuit controller, a controlling lever and contacts operated thereby for the control of the said electro-magnetic means; an indication device for the said controlling lever; means operated by the apparatus upon the completion of a movement. of the part or appliance for operating the said circuit controller to connect one of the motor windings with the indication device for the control of said device while the motor runs on current supplied to its other winding from the said source, and mechanism interposed between the said apparatus and the circuit controller for holding the said circuit controller in the position to which it has been moved by the apparatus during a predetermined period of time.

15. In combination with an apparatus for moving a part or appliance controlling the passage of cars or vehicles along a railway, an alternating current motor connected therewith and having two field windings, a source of alternating current, a circuit controller for connecting the said motor windings with the source of alternating current for the operation of the part or appliance, electro-magnetic means for the operation of the circuit controller, a controlling lever and contacts operated thereby for the control of the said electro-magnetic means; an indication device for the said controlling lever; means operated by the apparatus upon the completion of a movement of the part or appliance for operating the said circuit controller to connect one of the motor windings with the indication device for the control of said device while the motor runs on current supplied to its other winding from the said source, and mechanism interposed between the said apparatus and the circuit controller for holding said circuit controller in the position to which it has been moved by the ap paratus during a predetermined period of time, said mechanism comprising an air dash pot and a spring tending to force the air out of the dash pot.

In testimony whereof, I have hereunto signed my name to this specification, in the presence of two subscribed witnesses.

JOHN S. I-IOLLIDAY. Witnesses:

A. L. VENcILL, CHARLES B. GRAOEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D, G.

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