US915016A - Electric controller. - Google Patents

Description

F. E. CASE. ELECTRIC CONTROLLER. APPLICATION FILED JUNE 29, 190B.-

Patented Mar. 1909.

mums-"SHEET 1.

INVMEN-TOR 'ATTORNEY wn-nz ss'es 1 i P. E. OASEL. v ELECTRIC GONTROLLER.

APPLICATION'PILED JUNE 29, 1908 91 5,01 6 v Pat ted Mar. 9, 1909.-

4 SHEETS-SHEET 2.

wrmajiniz @iw F. E. GASEL- ELECTRIC CONTROLLER. APPLICATION PILIED'LIUNE 29. 1908i Patented Mans, 1-909.

4 SHEETS-SHEET s.

3.. ng-cAsE. I ELECTRIC CONTROLLER.

APPLIOATION FILED JUNB 29, 1908.

915,016. I I Patented Mar, 9, 1909.

4 SHEETSSHEET.4.

AT TOR'N EY UNTTED STATES PATENT OFFICE FRANK- n. CASE, or GANTON,-OHIO, ASSIGNOR To THE HARVARD COMPANY, 015 oAN'roN,

- oH ,A coRPoRA'rIoN or onio.

ELECTRIC con'rnonnnn.

specification of Letters Patent.

Patented. Karel; 9, 1909.

. To all whom it may concern:

to such particular use.

Be it known that I, FRANK E. CASEZ a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented a new and useful Else-- trio Controller, of which the following is a specification.

The invention relates to a controller for electric motors, and in the embodimentof the invention herein described and illustrated, the controller is designed for use with motors for dental engines, and it is, therefore, arranged to be manipulated by the foot of the operator.' It is not, however, intended to limit the scope of the invention Controllers of this character have usually been quite complicated, and the wiring connections very confusirig, so that an unskilled operator might not conveniently or readily separate the parts and reassemble them for repairs or adjustments; and one objectof the inven tion is to provide a controller which-can be used and understood by an unskilled operator.

The armature and the field of the motor are connected in series, and the armature .circuit is also connectedin multiple-arc with a shunt circuit including a rheostat; and a further object of the invention is to use a single switch blade for closing the main circuit with the armature-rheostat derived circuit established in eitherdirection, and, at the same time, to utilize a single rheostat for regulating the resistance in either direction. The controller can, therefore, be said to include a compound switch and compound rheostat.

These eneral objects and purposes are attained y pivoting a switch lever and a rheostat disk on the same axis, and by locating the contact-pieces of the rheostat on the disk so that they will have a sliding contact with a spring-arm located on the lever, by a rotation either of the lever or of the disk. One pair of switch jaws, for convenience herein called the forward-brush jaws, is located in a relatively fixed position adjacent to the side of the rheostat disk, and the other pair of switch jaws, for convenience herein called the reverse-brush jaws, is mounted ,on the rheostat disk. A

common switch bladeis pivotedon the disk and is provided with a suitable spring connection with the switch lever, so that when the lever is rotated in one direction, the

switch blade is thrown into contact with the forward-brush jaws, and when the disk 18 rotated in the opposite direction, the blade 'is thrown into contact with the reversebrush jaws. These general features of the controller, with the additional devices, springs, and wiring required to complete and connect the same for use, the accompanying drawings, forming part hereof, in whic Figure 1 is a plan ,view of the controllerwith "the cover removed,- showing in full lines the position of the parts when the forward-brush circuit is closed, and in dotted lines the position of the parts when the reverse-brush circuit is closed, the. position of the switch lever when rotated for the highest speed in the forward-brush circuit being shown in broken lines; Fig. 2, a vertical section of the controller on line 22, Fig. 1, showing the cover in place; Fig. 3, an underside view of the rheostat disk showing the arrangement and connections of the resistance wires; Fig. 4, a detached perspective view, showing in series, one above the other and in pro er position for assembling, the rheostat dis with itsattached parts, the main spring, the switch blade, the wireblock with its attached parts, and the switch lever with its attached parts; and Fig. 5, a diagrammatic view, showing the generator in symbol, the controller partly in plan and partly in symbol, and the motor part1 in symbol and artly in outline, and, i lustrating'the wiring connections and relative.

courses of the currents.

Similar numerals refer to similar parts throughout the drawings. v

The case 1 is preferably cylindric in form, with a closed bottom or base-2, faced with a frictional cushion 3 for resting on a floor or are illustrated intable, and a removable cover 4 which is preferably rovided wit the handle 5, by means of whic the contr ler can be conveniently carried from place to place. In the vertical axis of the case is formed or securely attached the pivot post 6, and in one side of'the case, preferably to the side wall thereof is securely attached the insulation wire block 7 by means of the bracket 8 fastened onv the outside of the case and having the arm 9 extending through the opening 10 in the Wall of the case, and thence curving a short distance along the inside of the wall; to which arm the wire-block is fastened as by means of screws.

The rheostat disk 11, hereinafter referred to merely as the disk, is made of insulation,

and is securely mounted on the sleeve 12,

which sleeve is telescoped on the pivot post 6 and rests upon the ste 13 in the bottom of the case, by means of which mounting the disk is adapted to rotate on the post. The resistance wires of the rheostat are Wra )ped in two coils, one within the other, around the two series of insulation posts 14 and 15,which posts are fastened to and depend from the under side of the disk, being secured thereto by suitable bolts as 16, the annular frame 17 of wire to constitute the initial resistance;

the fourth contact-piece 19, is connected by means of the conductingrod 23 to the wire of I the lowest section 25 of the outside coil, which section includes sufiicient wire for the first increase of resistance the fifth contactpiece 19 is connected, by means of the conducting rod 26 to the wire ,of the intermediate section 27 of the outside coil, which section includes a sufficient length of wire for the next increase of resistance; and the sixth contact-piece 19 is preferably somewhat elon ated and is connected by means of the con ucting rod 28, to the wire of the upper section 29 of the outside coil, which sectlon includes a sufficient increase of wire for the desired maximum resistance; it being understood that the various sections and coils of the resistance wire are connected in series, so that an increasing length" of the same is utilized, and consequently an increasing amount of resistance is brought into play, by closing the circuit on each succeeding contact-piece in the order named. The first contact-piece, 19, is not connected with any portion of the resistance wire, but is connected by means of the conducting strip 30, the conducting screw 31 and the conductin strip 32, with the conducting screw 33 on t 1e opposite side of the disk, to which latter screw the remote end of the wire of the inside or initial resistance coil 22 is also connected, being-the end of the series of resistance coils, as the same a are successively brought into use, so that the conducting screw 33 can be spoken of as being normally the terminal of the rheostat. The insulation block 34 is formed or attached on the upper side of the disk, and embracing one end, part of the inner side and parts of the upper and lower edges thereof, are the conducting plates 35 and 35, which plates are in contact with each other; and on the upper side of the block is securely fastened the reverse-brush jaws 36 which jaws are in conducting contact with the plate 35. The rheostat resistance, by its terminal, the screw 33, is in conducting connection with these plates and jaws, as is also the first contact plate 19 bymeans of the interveningstri 30, the screw 31 and strip 32, the latter of w ich connections is shown, diagrammatically, at 32*, on the upper side of'the disk in Fig. 4. The switch-bracket 37is securely fastened on the upper side of the disk, and is composed of. the foot-bar 38, curved concentric with the disk ivot, and the upright bearing 39in which the depending shank 40 of the switch blade 41 is pivoted. The curved arm 42 is revided on the upper end of the bracket, W rich arm serves as a stop to limit the movement of the blade in one direction.

The main spring 43 is of conducting ma-' terial and in the form of a plane spiral, and

the inner end of this spring is connected with and in conducting contact to the plate 35 on the inner side. of the small insulation block 34; this connection ljeing preferal 1y made by means of the pear-shaped slots 44 in the end of the spring, which slots are adapted to engage on the headed screws 45 extending through the side-block-plate 35, the spring plates 43 and 43', with similar slots 44*, lieing preferably provided to strengthen the s ring at the point of divergence from the block connection. The outer end of the main spring is secured, as by the screw 46,

to the outer periphery of the wire-block, near.

one end thereo the extreme end of the spring being bent upward and inward to form the plate 47 on the top of the block, to or through which plate is connected the binding-post 48, to which post is connected the wire 49 leading to what is designated herein as the reverse-brush of the armature. The forward-brush jaws 50 are fastened to thenpper side of the same end of the wireblock, as l;y means of the screw 51 which is provided with the annularly-giooved nut'52,

and underneath these'jaws and in conducting'contact therewith, is fastened the-upper end extension 53 of the conducting springplate 54, the free end of which plate is located on the inner side of the wire-block,' whence the plate is bent outward and upward on the end of the block, to which it is fastened as by the screw 55. The forwardbrush binding-post 56 is connected to the wire-block in conducting contact with and preferably through the up )er end extension of the spring-plate 54 an the rear ends of the forward-brush aws, and to this binding ost is connected the wire 57 leading ,to the orward-brush of the motor armature. The binding-post 58 is fastened to the wire-block in conducting contact with and preferably through the conducting-plate 59, one end of which plate extends across the up er side of. the block, whence it is bent ownward, thence along the inner side of the block, thence outward adjacent to the shoulder 60 formed on the inner side of the block and thence backward into the recess 61 formed in the block, in which recess the spring end of the plate 54 is adapted to operate. To the binding-post 58 is connected the wire 62 which leads to the field coiLof the motor.

The normal relation of the parts is with the conducting-plate 35 on the end of the disk-block 34 in contact with the portion of erator.

' from and out o the conducting plate 59 which extends across the shoulder of the wire-block, and in this relation of the parts, the boss 63 on the outer side of the disk-block 34 is adapted to abut the springlate 54 and throw it away contact with the inturned end of the field-plate 59, as shown by full lines in Fig. 1; but when the disk is rotated I to bring the disk-block 34 in the position shown b dotted lines in Fig. 1, the plate 54 springs inward to a contact with the inturned end of the field-plate 59, as shown in Fig. 4. The binding-post 64 is secured to the other end of the wire-block, in contact with and preferably through the main-conducting-plate 65, which plate extends across the top of the flock, thence down the inside thereof and thence inward adjacent tothe upper side of-;.'the disk, and has its free end resting in pressing and sliding contact on the foot-bar of the switch-bracket; the insulation plate 66 being preferably provided l on the inward extension of the main-plate to insulate the same from the main spring. To the l'inding- 0st 64 is connected the wire 67 leading rom the generator which supplies the electric current for the motor, which wire for convenience is herein called the main wire.

The switch lever 68, hereinafter called merely the lever, is pivoted by its sleeve-hub- 69 on the upper end of the pivot post 6 of the case, the hub preferably resting on the upper end of the disk-sleeve. lhe lever extends outward through the annularly-elongated slot 70 in the side of the case, and terminates veniently' manipulated by the foot of the op- On the inner end of the lever, which is extended beyond the pivot, is securely attached the insulation L-arm 72, and to this arm, at an interval from the side of the lever, is securely attached the rod 73 which is provided with the hook 74 on its end, to which hook is attached one end of the switch-spring 75, the other end of which spring is pivotally attached to the switch-blade at a point intermediate its ends, as by the pivotrod 76 thereon;

The minor spring77 is-coiled around the insulation sleeve 78 located around the hub of the lever, one end 79 of this spring being extended in the form of a hook and adapted to engage in the groove of the nut 52 on the screw 51, by which the forward-brush jaws are fastened, and the other end being ex.

tended to 'a connection at 80 with the inner end of the spring rheostat arm 81-, Which'arm is fastened intermediate its ends to the under side of the lever with the insulation strip 82 intervening. The foot 83 of the spring arm.

is arranged to forcefully abut the contactpiece 19, when the controller is in. its normal inoperative position, as shown in Fig; 2 and indicated by full lines in Fig. 1. The reverse pedal 84 is fastened to the disk, and extends outward through the annularly-e ongated slot 85 formed in the side ofthe case, by means of which the disk canbe manipulated by the foot of the operator.

4 In the normal position of the controller, the lever 68 is held against the shoulder 86 at the end of the slot 70, by action of the minor spring 77, and the buffer spring 87 is prefera ly provided on the side of the lever to. cushion this contact when the lever is thrown back to its normal position; and in the same relation of the parts, the disk pedal 84 does not come quite into contact with the shoulder 88 on the adjacent end of the 'slot 85, for the reason that the plate 35 on the end of the disk-block 34, 1s stopped against the action of the-main spring y the portion of the plate 59 which is bent across the shoulder 60 of the wire-block. The bent portion of this late is preferably adapted to form a cushion tor the abutment of the disk-block plate.

The main wire 67, the field wire 62, the reverse-brush wire 49 and the forward-brush wire 57 are preferably insulated and carried together through the aperture 89 formed in the bracket 8, and are thence carried in the form of a cable 90, as shown in Fig. 4, to their respective connections, but these wires are 3 more conveniently and clearly referred to as being extended directly from the respective controller binding-posts, as shown conven-' tionally at 67*, 62, 49 and 57 'in Fig. 1,

and, diagrammatically, in Fig. 5, whichlattric currents when the same are directed to enter the motor armaturethrough the forward-brush and to leave by the reverse switch-blade 41.

least resistance.

brush, is indicated by full arrows, and the reverse course is' indicated by broken arrows; and, likewise, the connections for the ,socalled forward current are indicated by full lines, and Where the connections for the reverse current are different from those of the forward current, "the same are indicated by dotted lines.

The incoming electric current from the generator 91 is received over the main wire 67, through the binding-post 64, the mainplate 65, the switch-bracket 37, and the To send the current to the armature through the forward-brush 92, the lever is rotated to the left from its normal position toward the position shown by broken lines in Fig. 1. After theinner end of the switch-spring 75 has been rotated to cross the pivoted-axis of the switch blade, the tension of the spring acts to throw the free end of the blade into contact with the forward-jaws 50, thus closing the forward circuit, the same being continued to the forward-brush 92 through the binding-post 56 and the wire 57.

The parallel branches of the shunt circuit separate at the forward-jaws, whence the rheostat circuit passes through the screw 51, the nut 52 and the minor spring 77-to the rheostat-arm 81. The rheostat-arm normally rests on the contact-piece 19, and the parts are so located and arranged that the lever must be thrown to the left until the rheostat-arm has cleared the contact-piece 19 and rests on either orboth of the contactpieces 19 and 19 before the switch-blade has been thrown into contact with the forward-jaws. This abutment of the rheostatarm on the contact- pieces 19 or 19*, closes the shunt circuit through the initial inner coil of the resistance, so that before the main circuit has been closed, the shunt circuit has been closed with its initial resistance, the initial resistance being in this controller the In this relation, the shunt circuit continues on through the wire 21 of the inner coil to the terminal screw 33 of the rheostat, which is-in circuit connection with the plate 35 'on the end of the disk-block where the rheostat shunt circuit is joined to the parallel armature-circuit which has passed on from the forward-brush 92 through the armature 93, the reverse-brush 94, its connecting Wire 49, the binding post 48, the

: main spring 43 and the plate 35 on the side of the disk-block, which plate is in conducting contact with the plate 35 on the end thereof. The plate 35 on the end of the disk-block being now in contact with the field-plate 59, as shown in Fig. 1, the re joined parallel circuits continue on together through the field-plate 59, the binding-jmst 58 and the wire 63 to and through the field coil 95 of the motor and thence, by way of abutment with the respective contact- pieces 19, 19 d and 19", the wires of the coil sections 25, 27 and 29 of the resistance wire will be brought successively into circuit connection, thus ultimately increasing the resistance to the maximum, and consequently increasing the speed to .the maximum. For the purpose of stopping or reversing the armature, the lever is permitted to rotate to the right to its normal position, which it does by action of the minor spring, and the parts are so arranged that the rheostat arm clears'the contact-piece 19 and abuts solely on'the contact-piece 1.9 before the switch has been withdrawn from contact with the forwardjaws, which withdrawal is positively accom-.

plished by the abutment of the end of the L.- arm 73 of the lever against the pivot-rod 76 of the switch-blade; as a result of which, the shunt'circuit is established directly with the rheostat terminal 33, and thence 'on to the field circuit through the conducting plate 30, the screw 31 and the conducting plate'32 thus cutting out all resistance, and in effect short-circuiting the armature and effecting what is known in controllers of this class as'the sudden stop.

To send the current to the armature through the reverse-brush 94, the current is received from the main wire to the switchblade 41 as before, and instead of rotating the lever, the rheostat disk is rotated by moving its pedal to the right sition toward the position shown by dotted lines in Fig. 1. After the pivot-axis of the switch blade has been rotated to cross the line of the switch-spring, the tension of the spring acts to throw the free end of the blade into contact with the reverse-jaws 37, thus from its normal p0.- I

closing the reverse-circuit, which is continued on to'the reverse-brush through'the main spring 43, the binding post 48 and the connecting wire 49. The rheostat shunt circuit is separated from the derived armature cir cuit at the reverse-jaws through the plate 35*, the rheostat-terminal screw 33 and thence reversely through the rheostat coils 22, 25, 27 and 29, as the case may he, to the respective contact-pieces. The rotation of the disk is arranged to clear the contact-piece 19 from abutment on th'e'rheostat-arm, and

to bring either or both of the contact- pieces 19 and 19 to abut thereon, before the switch-blade has been thrown into the centact with the reverse-jaws, so that, as before,

the initial resistance circuit is closed before the main-circuit is closed. The rheostat-circuit is com leted as before, but ina reverse direction, t rough the ;rheostat-arm 81, the minor spring 77, the nut 52 and the screw 51, to the forward-jaws 50, Where it is joined by the armature-circuit which passes from the reverse-brush through the armature 93, the forward-brush 92, the wire 57 and the bind ing-post 56; and as the forward-'aws are not now in contact with the switc -blade, the joined circuit asses on through the springplate 54, the eld-plate 59, the binding-post 58 and the connecting wire 63, to and throu h the field-coil 95 and the return wire 96 to the generator 91, thus completing the main cireuit as before.

It will be understood that when the disk is rotated to free the springlate 54 from the abutment of the post 62, t 1e plate 54 automatically springs into conducting contact with'the inturned end of the field-plate 59, which closing of .the circuit is indicated by the switch symbol 96 in the diagrammatic Fig. 5. And it is evident that, as the disk is rotated by moving its pedal to. the ,ri ht, the successive rheostat contact-pieces will be brought to abut on the rheostat-arm, thus, as before, gradually increasing the resistance to the maximum; and that when it is desired to stop or reverse the armature, the disk is permitted to return to its normal position, which it does by action of the main spring, and in so doing, the contact-piece 19 clears the rheostat-arm and the contact-piece 19' alone abuts on the rheostat-arm before the that the use of switch-blade is thrown from contact with the reverse-'aws, thus closing the circuit directly to the ield, without any resistance, and in effect, as before, short-circuiting the armature before the switch-blade has been withdrawn from contact with the reverse-jaws, which withdrawal, as before, is positively accomplished by the abutment of the end of the Lsarm of the lever with the pivot-rod of the switch-blade.

The resistance-coils which are illustrated and described herein, are adapted for the use of an alternatin current, but it is evident this particular type of resistance is not essential for the proper and ethcient operation of the other features of the improvement. And, it will be understood that the word' disk, in the description and claims herein, is used in a very general sense, to indicate a suitably shaped flattened plate or block on which the respective parts of the rhecfstat and other connections and devices are adapted to be mounted, and it is not intended to limit the word to indicate an exactly circular flat plate, although such a form is the one which is preferably embodied in the controller which is described and illustrated herein. nd it is evident that the s ICClfiC use of switch-jaws for the respective circuit-terminals, and the use of a blar e form of switch, are not essential to the general features and functions of the invention.

What I claim as my invention, and desire to secure by Letters Patent, is- Y Y 1. An electricmotor' controller in luding case with a main-wire, a fieldrwire, and tw brush-wire binding-posts anf a pair of switchjaws secured therein, one brush-post having a conducting-connection with the jaws; a lever and a disk co-axially pivoted inthe case; a switch-blade and a pair of switch-jaw on the disk; a rheostat having its resistancecoils and contact-pieces an the disk, its arm on the lever and its terminal in 00nduotutgconnection with the disk-jaws a conduc mgspring connecting the disk-jaws with th other brush-post and acting to hold the disk in open position; a conducting-mung connectlng t e case-jaws with the rheostat-arm and acting to hold the lever in open os tlqn; a conducting-connection between t 6 mainpost and the switch-blade; a conducting-c nnection between the field post and the diskjaws adapted to be switched to the case-jaws when the disk is rotated from its open position; and a connection between the lever and the switch-blade ada ted to throw the blade into the case-jaws w en the lever is rotated to close the rheostatwcircuit and into the disk-jaws when the. disk isrotated to close the same circuit; with a generator, a motor and wire connections; whereby a plpraller rheostat-armature circuit is establis ed in one direction in series with the motor-fifild. by rotating the lever, and a similar rhe st armature circuit is established in the reverse direction in series with the motor-field by retating the disk.

2. An electric motor controller including a case with a block therein, a pair of switchjaws having a conducting-connection wlth one motor-brush secured on the block, a lever and a disk co-akially pivoted in the case, a main-wire switch-blade and a pair of switch-jaws on the disk, a rhe'ostat having its resistance-coils and contact-pieces on the disk, itsarm on the lever and its terminal in conducting-connection with the disk-jaws, a conducting spring connecting the disk jaws with the cas'c-blockand with the other motor-brush-and acting to hold the disk in open position, a conductin'gspring connecting the ease-'aws with the rheostat-arm and acting to ho d the lever in open position, a conducting-connection between the motor-field and the disk-jawsadapted to'be switched to the case-jaws when the case is rotated from its open position, and a connection between the lever and the switch-blade adapted to throw the blade into the case-jaws when the disk is rotated to close the rheostat-circuit and into the disk-jaws when the disk is rotated to close the same circuit, whereby .a parallel rheostat-armature circuit is established in one direction in series with the motor-field by rotating the lever, and a similar rheostatarmature circuit is established in the reverse direction in series with the motor-field by rotating the disk.

3. An electric motor controller including a lever and a disk co-axially pivoted, switchjaws fixed adjacent to the disk and havmg conducting-connection with one motorbrush, switeh-jaws having conducting-connection with the other motor-brush and a main-wire switch-blade on the disk, a rheostat havinglits resistance-coils and contactpieces on t e disk, its arm on the lever and 1ts terminal in conducting-connection with the disk-jaws, a conducting-connection between the, rheostat-arm and the fixed jaws, means for normally holding the lever and the disk in open position, a conducting-connection between the motor-field and the diskjaws adapted to be switchedto the fixed-jawswhen the disk is rotated from its open position, and a connection between the lever and the switch-blade ad apted to throw the blade into the fixed-jaws when the lever is rotated to close the rheostat-circuit and into the diskjaws when the disk is rotated to close the same circuit; whereby a parallel rheostatarmature circuit is established in one direction in series with the motor-field by rotating the lever, and a similar rheostat-armature circuit is established in the reverse direction in series with the motor-field by rotating the disk.

4. An electric motor controller including a lever and a disk co-axially pivoted, switchjaws for one motor-brush fixed adjacent to the disk, switch-jaws for the other motorbrush and a main-wire switch-blade on the disk, a rheostat having its resistance-coils and contact-pieces on the disk, its arm on the lever in conducting connection with the fixed-jaws and its terminal in conducting connection with the disk-jaws, means for normally holding the lever and the disk in open position,,a conducting-connection be tween the motor-field and' the disk-jaws adapted to be'switched to the fixed-jaws when the disk is rotated from its open osition, and a connection between the lever and the switch-blade adapted to throw the blade into the fixed-jaws when the lever is rotated to close the rheostat-circuit and into the disk-jaws when the disk is rotated to close the same circuit, whereby a parallel rlreestat-arnn1ture circuit is established in one direction in series with the motor-field by rotating the lever, and a similar rheostat-armature circuit is established in the reverse direction in series with the motor-field by rotating the disk. I

- 5, An electric controller including a lever and a disk co-aXially pivoted, switch-jaws iixcd adjacent. to the disk, switch-jaws and a HltllllflVll'O snitch-blade on the disk, at rheostat having its resistance-coils and contactpieces on the disk, its arm on the lever in conducting-connection with the fixed-jaws and its terminal in conducting-connection with the diskjaws, means for normally holding the lever and'the disk in open position, a

return-wire conducting-connection with the disk-jaws adapted to be switched to the fixed-jaws when the disk is rotated from its open position, and a connection between the lever and the switch-blade adapted to throw the blade into the fixed-jaws when the lever is rotated to clo e the rheostat-circuit and into the disk-jaws when the disk is "ntated to close the same circuit, whereby a circuit in multiple-arc is established in one direction by rotatingthe lever, and a similar circuit is established in the reverse direction by rotating the disk.

6. An electric controller including a lever and a disk co-aXially pivoted, switch-jaws fixed adjacent to the disk and switch-jaws on the disk, a main-wire switch-blade adapted to enter the fixed-jaws when the lever is rotated one wav and the disk-jaws when the disk is rotated the other way, resistancecoils with contact-pieces and a terminal on the disk in conductingconnection with the disk-jaws, a contact-piece. on the disk in direct conducting-connection with the diskjaws, a return-wire conducting-connection with the disk-jaws adapted to be switched to the fixed-jaws when the disk is rotated, and an arm on the lever normally abutting the direct contact-piece and adapted to abut the resistance contact-pieces successively by a rotation of the lever or the disk, whereby a circuit in multiple-arc is established in one direction or the other, the arm being ar ranged to re-abut the direct contact-piece before the blade is withdrawn from the respective jaws, and thereby to suddenly short-circuit the current.

7. An electriccontroller includingm lever and a disk co-axially pivoted, Switch-jaws lixed adjacent to the disk, switch-jaws and a main-wire switch-blade on the disk, a rheostat having its resistance-coils and contactpieces'on the disk, its arm on the lever in coinluctirig-connection with the fixed-jaws and its terminal in coinlucting-connection with the disk-jaws, a return-wire conductingconncction with the disk-jaws adapted to be switched to the fixed-jaws when the disk is rotated to close the rheostat circuit, and a connection between the lever and the switchblade adapted to throw the blade into the fixed-jaws when the lever is rotated to close the rhcostat-circuit and into the disk-jaws when the disk is rotated to close-the same circuit, whereby a circuit in multiple-arc is established in the reverse direction by rotating the disk.

8. An electric controller including a lever I and a disk (o-axially pivoted, switch-jaws ing the disk.

fixed adjacent to the disk and switch-jaws.

on the disk, a' main-wire switch-blade adapted to enter the fixed-jaws when the lever is rotated one way and the disk-jaws when the disk is rotated the other way, a rheostat having its resistance-coils and contact-pieces on the disk, itsarm on the lever and Its terminal in conducting-connection with the disk-jaws, a return-wire conduct ing-connection with the disk-jaws adapted to be switched to the fixed-jaws when the disk is rotated to enter the blade in the diskjaws, whereby a circuit in multiple-arc is established inone direction'by rotating the lever and in the reverse' direction by rotat- 9L In an electric controller, a lever and a {disk co-axially pivoted, a rheostat having conducting-connection wit .its arm on the one and. its resistance contact-pieces and terminal on the other with a contact-p1ece on the same art having-direct the terminal, a

" main-wire adapted'to be connected with the arm by a rotationof the one and with the rheostat-terminal by a rotation of the other, and a return-wire adapted to be connected with the terminal by a rotation of the'one and with the armby a rotation of the other, the arm being arranged to abut the direct contact-piece before the main-wire is disconnected from the arm or the disk, whereby a circuit is established through the rheostat in one direction by rotating the arm and in the other direction by rotating the disk, and is suddenly opened by the return of the arm or the disk to normal position.

10. In an electriccontroller, a lever and a disk co axially pivoted, a rheostat having its arm on the one and its resistance contactpieces 'and terminal on the other, a mainwire adapted to be connected'with the arm by a rotation of the one and with the rheo stat-terminal by a rotation of the other, and a return-wire adapted to be connected with theterminal bya rotation of the one and -with the arm by a rotation. of theother,

whe reby a circuit is established through the rhcostat in one direction by rotating the arm and in the other direction by rotating the disk.

11.. In an electric controller, a lever and a disk co-axially pivoted, switch-jaws fixed adjacent to the disk, switch-jaws and aswitchblade on the disk, and a connection between the lever and the blade adapted to throw the blade into the fixed-jaws when the lever is rotated one Way and into the disk-jaws when the diskis rotated the other way, with means for normally holding the lever and the ,disk in open'positlon.

12. In an electric controller, a lever and a 1disk. co-axially pivoted, switch-jaws fixed.

adjacent to the disk, switoh jaws and a switch-blade on the disk, and a connection between thelever and'the blade ada ted to throw the blade into the fixed jaws w on the lever is rotated one way and into the disk jaws when the disk is rotated the other way.

13. In an electric controller, a lever and a disk co-axially pivoted, switch-jaws on the disk and switch-jaws fixed adjacent thereto, Y

and a switch blade adapted to be entered into the fixed-jaws by a rotation of the lever and into the disk-jaws by a rotation'o'f the disk.

14. In an electric controller, a lever and a disk co-axially pivoted, one circuit-terminal fixed adjacent to the disk, the othercircuitterminal and a switch on the disk, and a connection between the lever and the switch ada ted to .throw the switch into contact wit one way and into contact with the other terminal when the disk is rotated the other way.

15. In an electric controller, a lever and a disk co-axiall'y pivoted, one circuit-terminal fixed adjacent to the disk, the other circuitterminal and a switch on the disk, and a con-' one terminal when the lever is rotated nection between the lever and the switch a rotation of the disk.

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