US821386A - Apparatus for operating and controlling railway switches and signals. - Google Patents

Description

No. 821,386. PATENTED MAY 22, 1906.

J. D. TAYLOR. APPARATUS FOR OPERATING AND CONTROLLING RAILWAY SWITCHES AND SIGNALS.

APPLIGATION FILED JUNE 20, 1903.

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I. D. TAYLOR. APPARATUS FOR OPERATING AND CONTROLLING RAILWAY SWITCHES PATENTED'MAY 22, 1906 AND SIGNALS.

AP PLIGATION FILED JUNE 20, 1903.

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. 1 KI Mi ,2, Jnzfenfa No. 821,386. PATENTED MAY 22, 1906.

J. D. TAYLOR. APPARATUS FOR OPERATING AND CONTROLLING RAILWAY SWITCHES AND SIGNALS.

APPLICATION FILED JUNE 20, 1903.

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No. 821,386 PATENTED MAY 22, 1906. J. D. TAYLOR.

APPARATUS FOR OPERATING AND CONTROLLING RAILWAY SWITCHES AND SIGNALS.

APPLIUATION FILED JUNE 20, 1903.

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No. 821,386. PATENTED MAY 22, 1906.

J. D. TAYLOR. APPARATUS FOR OPERATING AND CONTROLLING RAILWAY SWITCHES AND SIGNALS.

APPLIUATION FILED JUNE 20, 1902.

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JOHN D. TAYLOR, OF BUFFALO, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, TO GENERAL RAILWAY SIGNAL COMPANY, I BUFFALO, NEW YORK, A CORPORATION OF NEW YORK. I

APPARATUS FOR OPERATING AND CONTROLLING RAILWAY SWITCHES AND SIGNALS.

Specification of Letters Patent Patented May 22, 1906 Application filed June 20, 1903. Serial No.162,363.

To a whom it Treaty concern.

Be it known thatI, JOHN D. TAYLOR, a citizen of the United States, residing at Buffalo, New York, have invented. certain new and useful Improvements in Apparatus for Operating and Controlling Railway Switches and Signals, of which the following is a full, clear, and exact description.

My invention relates to apparatus for operating and controlling railway switches and signals, more particularly to railway switching and signaling apparatus which is electrically operated and controlled.

Among the objects attained by this invention the following may be enumerated: first, to make the final movement of the lever after indication is received entirely automatic; second, to prevent false indication due to currents from field-magnet coils when the lever is changed in position while the movement of a switch or signal is taking place third, to lock the lever in both of its positions so that it cannot he accidentally moved; fourth, to prevent false indication due to a cross between the operating and indication wire; fifth, to so construct the mechanism that the force of the blow due to movement of the lever when it is suddenly stopped at the indication-point will not come on the latches which hold the lever against final movement. I accomplish these objects by means of the apparatus shown in the accompanying drawings and diagram, in which- Figure 1 is an end elevation of an inter locking machine. Fig. 2 is a front elevation of the same, showing an eight-lever machine. Fig. 3 is an end elevation of the indicating or releasing mechanism upon a larger scale. Fig. 4 is a cross-section of Fig. 3, taken on the line a: :1: looking toward the left in the drawing. Fig. 5 is a similar view, the section being the same, showing the parts after indication has been received and the final movement completed. Fig. 6 is the notched slot-locking plate. Fig. 7 is a top plan view of the wiperplate and the mechanism secured to and moved therewith. of the wiper-plate. Fig. 9 1s a perspective view of a portion of the indicating or releasing mechanism shown in Fig. 3, showing more clearly the head 23 of the armaturerod 25*, the block 22 and the latch 19 which is not shown on Fig. 3, but which is the Fig. 8 is a side elevation same in construction as the latch 19. Fig. 10 is a top plan view of the spring which throws the rocking-arms. Figs. 11 and 12 are respectively an elevation and a plan of a fragment of the mechanical interlocker. Fig. 13 is a diagram of the circuits.

Mechanical interlocking between lovers is effected by means of any of the well-known systems of mechanical interlocking. That shown in the drawings is what is known in the art as the Saxby. and. Farmer locking.

In Fig. 1, 1 is a locking-bed having grooves containing the locking bars and is supported on girders 2, resting on legs 3. An elevation and plan of part of the looking is shown in Flgs. 1]. and 12.

means of the connection shown in 1 and 2 and especially in Fig. 11. A crank 6 is keyed to the shaft 4 and is connected by a rod" 7 to a crank 8, which is splined to the shaft 9. The crank 8 is splined to the shaft 9 in such manner as to rotate with it, but at the same time to permit free longitudinal movement of the shaft 9. It will thus be seen that the movements of the locking-bar 10 are efi ec ted by rotational movement of the shaft 9, but not by longitudinal movement of the shaft. Referring now to Fig. 8, the shaft 9 is journaled in a frame comprising the parts 34 and 34, supported on the girders 35 and 35, which are in turn supported on the leg 3. is a handle rigidly secured to the shaft 9 and with it constitutes what is termed the operating-lever. The shaft 9 passes through holes in the crank 11 and arms 12 and 12". The crank 11 is attached rigidly to the shaft 9 by means of a pin or by any other desirable means, while the arms 12 and 12 are free both to turn and to slide longitudinally on said shaft 9. The crank 11. has a pin 13 passing through its lower end and parallel to the shaft 9 and projecting each side of the crank 11 to adistance equal to the thickness of the arm 12 or 12*. Holes are formed in the arms 12 and 12 in such location that the pin 13 can pass through them when the crank 11 and the arms 12 and 12 he in a common vertical plane. The arms-12 and 12 are hold such distance apart by the yoke 32 that when The shaft 4 is journaled in the girders 2 and carries arm 5, rigidly at tached to it and which drives the longitudi f Rotary motion is ima springs 42, 43, 44, and 45.

the pin 13 is in full engagement with the arm 12 it is free from the arm 12, and vice versa. Since the arms 12 and 12 are mounted loosely on the shaft 9, one or the other may be moved over an arc of a circle of said shaft 9 when free from the pin or 15 as the case may be. The arms 12 and 12 pass through a slot in the plate 30, which forms part of the framework. The plate and this slot are clearly shown in Fig. 6. The slot consists of a part or portion 31, parallel to the shaft 9, and of lateral notches 53 and 53 at opposite ends of and on opposite sides of the straight portion or part 31.

In Fig. 3 the shaft 9 is shown in its extreme right-hand positionin other words, with the lever 55 pulled out as far as possible. For convenience I will term this the reverse position of the l6V3I and the extreme position to the left the normal position of the lever. A frame 14 slides in guides on the plate 30 and carries pins 15 and 15*, which are in alinement with the pin 13 when this is in its central position with reference to the rotational movement of the shaft 9. The distance between the pins 15 and 15 is just sufficient to permit free lateral movement of the pin 13 between them. If the shaft 9 is moved longitudinally toward the normal position, (assuming for the present that the in itial rotational movement has been made,) it slides through the arms 12 and 12 until the crank 11 is brought into contact with the arm 12. This carries the pin 13 through the hole in the arm 12', pushing the pin 15 ahead of it and through it moving the frame 14 and carrying the pin 15 through the hole in the arm 12 just vacated by the pin 13. After the crank 11 comes into contact with the arm 12 further movement of the shaft 9 to the left carries the arms 12 and 12 with it. Longitudinal movement of the shaft 9 is limited by the sleeves 33 and 33, which form stops by abutting against the frames 34 and 34 These sleeves 33 and 33 are supported loosely upon the shaft 9 and are free to slide upon it. Movement toward the normal position is limited so as to put the arm 12 in alinement with the notch 53*, and movement to the reverse position is limited to stopthe arm 12 in alinement with the notch 53.

The circuit-controller comprises a movable block of insulating material 37, carrying four contacts 38, 39, 40, and 41 and two fixed blocks of insulating material 48 and 48", each having four brushes or electrical contact In one extreme position (the reversed position) of the block 37 the contact-piece 40 makes electrical connection between the brushes 42 and 44 and the contact 41 connects the brushes 43 and 45. In the other extreme position (the normal position) the contact 38 connects the brushes 42 44 and the contact 39 connects the brushes 43 45 Movement is imparted formed in the bridges 28 and 28 to the block 37 from the shaft 9 by means of a stud 51, which projects through a slot in the plate 52 into a transverse groove in the crank 11. Longitudinal movement only of the shaft 9 affects the controller.

The magnet-armature 26 is suspended on a rod 25, which extends upwardly between the spools of the magnets 27 and through a hole in the yoke 36 and terminates in a square head 23. The upper and inner edge of the head 23 (see Fig. 9, which shows this construction in the head 23) is beveled to an angle of about forty-five degrees, and a groove 24 is formed in the side of the head, which. receives the end of the pawl 19. The other end of the pawl 19 is normally in engagement with the latch 18 and holds it from turning on its pivot. The pawl 19 is disengaged from the latch 18 by an upward movement of the armature 26, acting through the rod 25. A stop-pin 29 (see Figs. 4 and 5) limits the movement of the latch 18, so that when the pawl 19 is in engagement with the latch the latch is held in fixed position. The arm 12 carries a pin 16, which in the full reversed position of the lever 55 passes through a slot in the latch 18. The latch 18, pawl 19, and pin 29 are supported on a bridge 28, attached to the magnet-yoke 36.

A plate 21 is free to slide longitudinally on the magnet-yoke 36 and is guided by recesses Attached to the plate 21 are the block 20 and wipers 22 and 22 The plate 21 has slots 46 and 46, (see Fig. 7,) through which pass the heads of the rods 23 and 23, respectively. The block 20 lies in the path of the arms 12 and 12 and motion is thereby imparted to the plate 21. The wipers 22 22 pass over the heads 23 23. When the lever is moved to the reverse position, the arm 12 strikes the block 20 and through it moves the plate 21 so as to carry the wiper 22 over the head 23, the bevel on the wiper striking the bevel on the head, thus forcing it down, if it is not already down, and through the rod 25 pushing the armature 26 away from the magnet 27 and at the same time forcing the pawl 19 into engagement with the latch 18, the latch 18 having been left in the proper position by the previous movement, where it remained due to excess of weight on the side over the stop-pin 29.

The movement of the plate 21 due to the arm 12 is just sufiicient to bring the end of the slot 46 against the head 23*. The plate is thus prevented from going too far. In this position the wiper 22 still overhangs the head 23, as clearly shown in Fig. 3. It thus prevents the armature 26 being lifted and holds the pawl 19 locked in engagement with the latch 18. The latch 18 in turn holds the arm 12 from dropping into the notch 53, and the arm 12 being in engagement with the crank 11 holds the shaft 9 against rotational movement, and since the locking between levers is stages 'controlled by the rotational movement of the shaft 9 this locking depends for its release on the disengagement of the pawl 19 from the latch 18. In the position of the plate 21 above described the bevel on the wiper 22 is over the bevel on the head 23. If now the magnet 27 is energized, the armature 26 will be lifted and pushthe head 23' upwardly and out of the slot 46 causing the bevel on the head to strike the bevel on the wiper 22 and drive the plate 21 enough farther to carry the wiper 22 away from over the head 23 (see Figs. 7 and 8) and leave the armature 26 free to respond to attraction of the magnet 27. If now the magnet 27 is energized, the armature 26 will be lifted, causing the disengagement of the pawl 19 and latch 18. The spring 54 (see Figs. 3 and 10) is compressed between a lug 17 on the arm 12 and a lug 17 on the arm 12 and as soon as the latch 18 is freed from the pawl 19 this spring forces the arm 12 into the notch 53 in the plate 30. During this movement the latch 18 turns on its pivot, the stud 16'remaining in the slot in the latch. This movement of the arm 12 through its connection with the shaft 9 by means of the crank 11 and pin 13 causes a rotation of the shaft 9 through a small arc and by means of its connection with the locking-bar moves the bar and automatically releases certain other levers in the machine. It will thus be seen that the release of locking between levers, or, as commonly termed, indication, when one is reversed depends on the magnet 27 being first energized, and afterward. the magnet 27 must be energized. In going from reverse to normal position these conditions are reversed.

Fig. 5 shows the position of the pawl, latch, and arms whenthe lever isin complete reversed position. While the arm 12 is in the notch 53 the shaft 9 cannot be pushed in, so that an accidental movement of the lever cannot be effected by a man leaning against it. To move the lever, say, from reverse to normal position, the first movement is rotational, which moves the locking far enough to lock up other levers whose movement would conflict with the new position of the said lever.

This part of the movement is limited by the arm 12 striking the back of the slot 31 in the plate 30 and rotates the latch 18 into the position to be locked by the pawl 19. The pawl 19 is put into place by the armature 26 dropping of its own weight, aided, if desired, by a spring. If by chance the armature should not drop, the wiper 22 could not pass over the head 23, and the lever would be prevented. from making its complete longitudinal movement by the arm 12 being arrested by the block 20. The longitudinal movement of the shaft 9 carries the movable part of the controller away from the contact-springs (the reverse in this case) and puts it in connection with-the springs at the opposite (normal) end. At the same time the pin 13 is Withdrawn from the arm 12 and inserted through the arm 12*. The pin 15 follows the pin 13 and enters the arm 12 as the pin 13 is withdrawn and prevents the arm 12 dropping back into the notch 53 in case the pawl 1.9 does not go into place to lock the latch 18. The final part of the longitudinal movement inserts the pin 16 into the slot in latch 18 and pushes the wiper 22 over the head 23, forcing the head down, if not already down, and through it insuring that the pawl 19 locks the latch 18. The movement of the plate 21 is stopped. by the end of the slot 46 striking the head 23 at such a point that the wiper 22 still overhangs the head 23. The final movement of the plate 2]. is produced bythearmature 26 being lifted by a current in the coils of magnet 27, and the release of the latch 18 is effected by a current in the coils of the magnet 27 l/Vhen the latch 18 is released, the arm 12 drops into the notch 53 influenced by the spring 54, and thus automatically releasing the locking.

84 is a lever pivoted at its middle point to a bracket secured to the magnet-frame.

and 85 are pins secured to the armatures 26 and 26?, respectively, and project laterally therefrom and are so positioned that one end of the lever 84 lies in the path of movement of the pin 85 and the other end in the path of the pin 85*. The purpose of this device will be described in connection with the circuits.

The electrical connections are such that when the lever is put in reverse position the operating-current circulates in the coils of magnet 27 and the indication-current oirculates in the coils of magnet 27, and when the lever is put in normal position the opcrating-current flows in the coils of 27 and theindication-current in the coils of 27 To more fully explain this, I will describe one movement of the lever say from normal to reversein connection with the circuits shown in Fig. 13, in which 56 represents the switch-operating motor-armature; 57, the field-coils of same; 58 59, 60, 61, 62, and 63, parts of the pole-changing switch, and 64 the battery or source of electrical energy. The switch-operating motor and pole-changing switch are fully described in my Patents No.

554,095, dated February 4, 1896; reissue No.

11,983,May e, 1902, 27, 190i. 1

The first movement of the lever 55 gives a rotational movement of the shaft 9, as before described, and locks all other levers governing movements conflicting with the new position of the said lever. The second or longitudinal movement removes the contacts 38 and. 39 from the brushes 42 44 and 43 45 and puts the'contact 40 into connection with brushes 42 and 44 and the contact 41 into connection with brushes 43 and 45 and perand No. 681,589, August IIO forms the various mechanical functions described above. Here the attention required from the operator ends, the remainder of the movement being automatic. This closes a circuit of the battery 64, so that current flows from said battery through wires 66, brush 42, contact 40, brush 44, wires 71 7 2, magnet 27, wire 7 8, contact 61, switch-arm 59, wire 81, armature 56 wire 80, switch-arm 58, contact 60, wire 82, field-coil 57,wire 83,backto battery 64. This causes rotation of switchoperating motor-armature 56 and through suitable gearing the movement of the switch points. When the points are home and locked, the pole-changing switch is automatically shifted, as described in my abovenamed patents, so that the arm 58 breaks contact with 60 and makes contact with 62 and the arm 59 breaks contact with 61 and makes contact with 63. This breaks the battery-circuit above described and forms a new circuit, including the motor and indicattion-magnet, so that the current generated by the rotation of the motor-armature due to momentum flows from said armature 56, through wire 81, switch-arm 59, contact 63, wires 79 82,field-coils 57, wires 83 76 74, brush 45, contact 41, brush 43, wires 69 magnet 27 wire 77, contact 62, switch-arm 58, and wire back to armature 56. From theabove it is seen that the magnet 27 a is in the operating-circuit and 27 in the indicating-circuit. Energizing the magnet 27 effects the final movement of the plate 21 and releases the armature of magnet 27, so it can' respond to the indication-current and release the latch 18, thus permitting the lever to make its final rotational movement under the influence of the spring 54. The movement to normal position is just the same as that above described, except that the magnet 27 would then be in the operating-circuit and the magnet 27 in the indicating-circuit.

The object of having the indication-armature released only by the operating-current in the opposite magnet is the following: Suppose in the movement above described the switch-points had been blocked by an obstruction of some kind, so that they could not complete their movement. The polechanger 58 59 would not be shifted and the batterycurrent would continue flowing through the motor stationary, and suppose the operator, seeing this condition indicated by an ammeter or other indicator, should put the lever back normal. This would of course break the circuit first above de scribed and would not establish a new batterycircuit, as the normal operating-circuit is open between the contact 62 and arm 58. It would, however, close the normal indication-circuit, so that the induced current due to decaying magnetism in the motor-field magnets would send a current from said-field coils through wires 83 76 75, brush 45*, contact 39, brush 43 wires 73 72, magnet 27*, wires 78, contact 61, arm 59, wire 81, armature 56, wire 80, arm 58, contact 60, and wire 82 back to field-coils 57. This current would energize magnet 27* and if its armature were not locked would release the lever to go to full normal position, while the switch-rails remain in a position either normal or reverse but by the arrangement of mechanism above described the' armature 26 remains locked, because there has been no current through magnet 27 to release it.

The object of the lever 84 is to prevent a false indication due to a cross between the operating and indication wire. This lever is pivoted in the middle to a bracket supported by a magnet-frame. One end of the lever is in the path of a pin in the armature 26 and the other end in the path of a pin 85 in the armature 26 and the distance between the pins and lever is so adjusted that both armatures cannot make their full upward stroke at the same time. From Fig. 13 it will be seen that if a cross existed between wires 77 and 78 a current would flow from battery 64 through wires 65 67,- brush 42', contact 38, brush 44 wires 68 69, magnet 27, wire 77 through cross-wire 78, magnet 27 wires 72 73, brush 43*, contact 39, brush 45 wires 75 76 back to battery 64. This would tend to lift both armatures 26 and 26 but since, as before described, the indicationarmature is locked until the other armature is lifted to release it and since the current due to a cross is in series through both magnets the other said armature will be held up, and the indication-armature will be locked by the lever 84. The cross would do no harm unless it came on while the switch is in the act of moving; but it is to prevent this remote contingency that the lever 84 is introduced.

It will be evident to one skilled in the art that the indication-current may be employed directly to produce the final movement or that the indication-current may be employed to close a circuit of the battery to produce that movement.

The spring 54 is preferably employed for economy and simplicity.

While I do not wish to limit myself to the specific construction shown,what I claim is 1. In combination with a source of energy, an operating and indication circuit, a circuit controller, a motor and an electric switch, an operating-lever, means under the control of the operator for making the initial and middle movements of said operatinglever, a spring, means for setting up said spring by the initial rotation of said operating-lever, and electromagnetic means for releasing said spring at the proper time to produce the final movement of the lever, substantially as and for the purposes set forth.

2. In combination with a source of energy,

ICC

V 1 g, in combination with a mechanical interan operating and an indication circuit, a cirl cuitcontroller, a motor and an electric switch, an operating-lever, means under the control of the operator for making the initial and middle movements and for storing up energy to produce the final movement and electromagnetic means for calling said storedup energy into action to produce the final movement automatically, and means for locking said. operating-lever against movement by accident in both of its final positions, substantially as and for the purposes set forth.

3. In combination with a mechanical interlocker, a source of energy, operating and indlcation circuits, a circuit-controller, a motor and an electric switch, an operating-lever manually actuated in its initial movement to store up energy to produce the final movement and to move an element of the mechanical interlocker and manually actuated in its middle movement to establish the opcrating-circuit, and electromagnetically-operated means to cause said stored-up energy to causethe final movement of said lever and to move an element of the mechanical interlocker, substantially as and for the purposes set forth.

4. An operating-lever having its initial movement in rotation at right angles to the axis of its main shaft, its medial movement longitudinally upon the axis of said main shaft, and its final movement in rotation upon the axis of said shaft but in reverse direction of rotation from that of the initial movement, means for locking against the medial movement longitudinally until after the initial movement in rotation is made, a stop for limiting the medial movement, means for locking against the final movement, and electromagnetic means for'releasing said lock against final movement, substantially as and for the purposes set forth.

5. An apparatus for operating and control ling railway switches and. signals, comprislocker, a sourcekof energy, operating and indication circuits, a ClI'CLlltrCOl'lllIOllBI, a motor and an electric switch, an operating-lever mechanically connected to anelement of the mechanical interlocker and mechanically connected to said circuit-controller, to actuate an element of said mechanical interlocker on the initial movement, and to actuate said circuit-controller on the middle movement, electromagneticallyoperated means energized by the indication-current to automatically cause the final movement of the operating-lever, thereby causing the final movement of an element of the mechanical interlocker, substantially as and for the purposes set forth.

6. In combination with a mechanical interlocker, a source of energy, operating and indication circuits, a circuit-controller, a

motor and an electric switch; an operatinglever, means for actuating elements of said mechanical interlocker by the initial move ment of the operating-lever, means for closing the operating-circuit by the intermediate movement of the operating-lever, means for stopping the operatingdever at the end of the intermediate movement, and electromagnetically-operated means for releasing energy to cause the final movement of the operating lever, substantially as and for the purposes set forth.

7. In an apparatus for operating and controlling railwayswitches and signals, mechanism to make the final movement of the operating-lever afterindication-is received entirely automatic, comprisingan operatinglever, indication magnets and armatures, a crank rigidly secured to said operatinglever, a pin on said crank, arms loose on said opcrating-lever, holes in said arms capable of receiving said pin on said crank, a spring interposed between said arms and tending to throw them out of plane, heads on the rods of said armatures, a reciprocating plate, wipers, and a lug secured to said plate, said lug being capable of engagement with said arms, and said wipers being capable of engagement with said heads, latches governing the rotational movement of said arms, and detents governing said latches and governed by said heads, whereby the final movement of the operating-lever is effected by the action of .one of said heads uponone of said wipers moving said plate to release the other head from the'other wiper to permit it to actuate its detent to release its latch, thus permitting the throw of said spring, substantially as and for the purposes set forth.

8. In an apparatus for operating and controlling railway switches and signals, mechanism to prevent false indication due to currents from field-magnet coils when the operating-lever is changed in position while the movement of a switch or signal is taking place, comprisingarmaturerods and heads on said rods, a reciprocating plate, wipers on said plate engaging over said heads on said armature-rods, whereby the armature-rod of either indication-magnet is held against movement by its respective wiper coming in contact with the adjacent end of said reciprocating plate in case the other ndicationmagnet armature is raised to cause its respective wiper to engage the other end of said reciprocating plate, substantially as and for the purposes set forth.

9. In an apparatus for operating and controlling railway switches and signals, mechanism to lock the operating-lever in both of its positions so that it cannot be accidentally moved, comprising, an operating-lever, a crank rigidly mounted thereon, a pin on said crank, a yoke on said operating-lever, arms carried within said yoke, a plate on the machine-frame, a slot in said plate, and notches in said slot capable of engaging said arms, and a spring for holding one of said arms in one of said notches, substantially as and for the purposes set forth.

10. In an apparatus for operating andcontrolling railway switches and signals, mechanism to prevent false indication due to cross between the operating and indication wire, comprising, indication magnets and arma tures, a pivoted lever-bar, pins on said armatures, said pins and said lever being so positioned that when both magnets are energized in series by a cross, the indicationmagnet cannot complete its stroke, substan tially as and for-the purposes set forth.

11. In an apparatus for operating and controlling railway switches and signals, mechanism to meet the force of the blow due to movement of the operating-lever when it is suddenly stopped at the indication-point, compri singan operating-lever, arms mounted on said lever, a yoke mounted over said arms, a crank rigidly mounted upon said opcrating-lever between said arms, sleeves mounted loosely on the shaft of said operating-lever and of such length, respectively, as to abut against the frame and against said yoke to limit the axial movement of the operating-lever, substantially as and for the purposes set forth.

12. In combination with a source of energy, operating and indication circuits, a circuitcontroller, a motor and an electric switch, an operating-lever having its initial and final movements rotatory and its middle move ment axial, arms mounted loosely upon said operating-lever, a crank rigidly mounted up on said lever between said arms and imparting motion to said arms, a plate having a slot, and notches in said slot to engage said arms, a spring interposed between said arms and tending to hold them out of plane, a pin on said crank, holes in said arms capable of receiving said pin, a frame carrying pins capable of registration with. said pin on said crank to hold one or the other of said arms from engaging in one of said notches, indicationmagnets, armatures, and rods with beveled heads, a reciprocating plate, wipers secured thereto and capable of being acted upon by said heads, a lug on said plate capable of engagement with said arms, substantially as and for the purposes set forth.

In witness whereof I have hereunto set my hand, in the presence of two witnesses, this 15th day of June, 1903.

JOHN D. TAYLOR.

Witnesses EDWARD C. RIsoHMAN, S. BROWN.

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