US1578878A - Electromagnetic switch mechanism - Google Patents

Description

H. W. CHENEY ELECTROMAGNETIC SWITCH MECHANISM March 30,1926, 1,578,878

Filed Feb. 9, 1921 5 Sheets-Shet 1 March 30 1926. 1,578,878

H'. w. CHENEY ELECTROMAGNETIC SWITCH MECHANISM Filed Feb. 9, 1921v 5 Sheets-Sheet 5 March 30 1926. 1 ,578,878

H. w. CHENEY ELECTROMAGNETIC SWITCH MECHANISM Filed Feb. 9, 1921 s Sheets-Sheet 4 Patented Mar. 30, 1926.

' UNITED STATES'PATENT OFFICE] HERBERT W. CHENEY, F MILWAUKEE, WISCONSTN, ASSIGNOIB. TO ALLIS-CHAEMERS 1 MANUFACTURING COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OI" DELAWARE.

ELECTROMAGNETIC SWITCH MECHANISM.

Application filed February 9, 1921. Serialms. 443,499.

To aZZ whom it may concern:

Belt known that HERBERT W. CHENEY, a

citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of \Visconsin, has invented a certain new and useful Improvement in Electromagnetic Switch Mechanism, of which the following is a specification. This invention relates to electromagnetic switch mechanisms and may be applied in -1notor starters and particularly to that type which is automatic in operation.

. One of the objects of the invention-is the provisionof a self-contained switching device which is separately salable, and which may be applied to controllers of the type in which a motor is first connected to a potential reducing device and then directly to the line. The self-contained switching device may, however, be also applied to electromagnetically operated controllers or switches in general and is particularly applicable to I such as are of the double throw type, When so applied, it is an object of the invention that such switches or controllers will become automatic in character and function to first move to one predetermined position and a predetermined time thereafter to another position.

Another object of theinvention is the provision of asimple and efiicient self-com tained switching device, which may be easily applied in the types'of switches or controls lers as noted above. Amore specific object is the provision of a Selfecontained unit, which maybe operatively associated with switches and controllers by means of a single mechanical connection. Other objects will appear hereinafter as thedescriptionof the invention proceeds.

The novel feature of the invention will appear from this specification and the aceompanying drawings forming a part there-f of, and disclosing one embodiment thereof,

and all these novel features are intended to be pointed out in the claims.

In the'drawings, Fig. 1 is a front elevation of a unitary or self-contained switching device embodying the finvention, as itmay be applied in connection with anelecs va device as shown in Fig. 2.

device, such as shown in .Fig. 1, V g

v with an apertured plug 19. A-rod 20-asso- Fig. 3 is a vertical sectional view of such- Fig. 4 is a front elevation of the device,.

shown in Fig.2.

.' Figs. .5 and 6 are fragmentary views in front elevation of some of the parts shown to I in Fig. 4,",butin difi'erenh operative positions.

Figs. 7 and 8 are diagrams of the manner in which the. switching device, such as dis closed in Fig. 4, may beeleotrically con-Q nected and associated with electromag neticallyx operated controllers of different yp 5T The control unit, or automatic switching device 1, is shown in Fig, Lin operative re-- lation to" the electromagnetic actuating 'mechanism 2 of a motor controller. The

controller is provided with'an operating I mechanism 3 and movable and stationary contacts 4. Inasmuch as the specific form of the electromagnetic actuating mechanism,

operating mechanism, and movable and sta- -tionary contacts 1s not material as far as the invention herein claimed is concerned theyned notbe further described; they are,

however, diagrammatically shown in Fig. 7, and their operation and relation to the control unit 1 will be more fully set forth hereinafter. I v

Referring now more particularly to Figs. 2, 3 and 4: the control unit is provided with a longitudinally movable member 5 here shown as of tubular form, which is movable in guides 6, 7 suitablymountedin the legs i '8, 9 respectively of the U shape'fran e 10. '-The frame 10 is fastened in any suitable manner to a board or support 107. The tube 5 is (provided at its lower end with an aperture p the tube passes through the aperture inthe plug,- and is provided at its upper end with a member 13, by which it' is pivotally connected'to a lever 14, one end of which lever plug lL. A-rod 12 disposed within 1 i is. pivoted to a lug 15,,rigidly associated I with the boar-d107, "The. other end of. the

lever 14, isconnectedby means of a link 16 v to the piston of adash pt 17. Aspring 106 is disposed around t e rod 12 and'between the meinberj13 and plug .11.The

lever 14 is herelshown as slots 18 in the tube 5.

passing through The upper end of the tube 5 is provided ciated with an armature or core 21 of 'a thebracket 51. The bracket 51 is provided magnet 22, passes through the aperture in the plug 19. The lower end of the rod 20.-

has a collar 81 fastened thereto. A spring the core 21, and the plug 19. 5

1o associated with the lever 23, are contacts 25, U 58, provided with an adjusting screw 59 held 82 is disposed-around the rod 20 and between the shoulder formed by the lower end of A floating lever 23 1s pivoted on the pin 24 carried by the armature 21. Operatively 26. The contact "25 is here shown as shaped and is mounted on .a lever 27 pivoted on the pin 28. The pivot-pin28 is mounted on, an jinsulating board .29 carried by the main board. 107, andfis provided with terminal 92, at the rear of the board 29. vThe lever 23-carries a roller 30, which is disposed betweenth-e lateral portions of the U shaped contact 25,,whereby' movement in either an upward or downward direction ofv said roller, causes the lever 27 to swing about the pivot 28. The contact 25 is adapted to engage'a stationary contact 31 mounted .on the board 29 and provided at its rear end-With a terminal 38. Contact 31 serves at the same time as a stop for contact 25. In itsopen circuit position, the contact 25 engages the stop 32, mounted on the board 29. The contact 26, which is of the same form as contact 25, is provided with a button-like contact surface 33,- best seen in Fig. 3. The contact 33 is adapted to engage and slide over the stationary contact studs 34, 35, which are provided respectively with transversely extending stops 36, 37. "The contact.

studs 34, 35 pass through the board 29, and are provided at the rear with terminals 39, 40. The contact 26 is mounted a lever 41, swingable about the pivot 42.. he ivot 42 is mounted on the board 29, passing t erethrough, and provided at the rear with a.- terminal 96. The lever 23 is rovided with a roller 43, disposed-between t e lateral por tions of the U' shaped contact 26.- When the roller 43 is moved in an upward direction by Y the lever 23, the contact surface 33 will slide by member 37, as indicated in Fig. 4. I

.over. contact 35, then slide onto; contact 34,-

leaving contact 35, the upward motion being x stoppedby the transverse member .36. The

downward motion of contactj36-is stopped The pivot'pin 44,.of the roller 4,3,is extended sufiicientlyso that .19; latch 45 may, engage therewith. The latch-45 is pivotally mounted on the pin 46,""carried:-by a" bracket 47. The bracket 47 may be integral with the bracket 51, here shown" as "mounted in any suitable manner on'the leg'59., The

6,) latch45 is so mounted, or proportioned, as

to engage and hold the pin 44whe'n-the' contact has reached its lower limitingposition, as shown in Fig. 4. A spring 48 is provided for biasing the latch 45 into engag1ng-posi tion with respect to pin- 44, and'jis' here shown as connected to an extension 49on ,ber 55 provided with pintles 53, 54, 't hroughhole's in the lugs 50, 52. Tie trip member '55 is provided with a. rearward latch, and to the lug 50 forming part of with another lug 52 and between this and the lug 50 is pivotally mounted a trip memassing extension 56, disposed over a lateral extension 57 on thelatch 45. The trip member is; also provided with a forward extension in any. desired position by'means of a lock nut 60. The screw 59 is so disposed as to be len'gaged by the lever 14 when the latter is swung in a counter-clockwise direction.

A bifurcated lever 61 has its two portions ypivotally related at diametrically opposite points with the guide 7, bynmeans of pivot screws 62, 63 as best seen in Fig. 3. Referring now to Fig.- 4: the lever61 is connected by means of a link 64 to the lever 23. A

pivot pin. 65 forming a pivotable connection between the link 64 and the lever 23, is located on the same side of the pin 24 as the contact 26. The other end of the lever 61 has pivotally connected thereto, a down 'wardly extending rod 66.. The lower end rod 66, maybe determined. The rod 66 is biased in an upward direction, by means of a spring 71, fastened to a transverse pin 72 'on the rod 66 and .to the leg 9. c

.' The clamp 68 surrounds the tube 5 and 15 also provided with a rearward extension 73, having a hole 74, (see Fig. 2). The'extension 73 may be connected in any suitable manner with a selected moving portion of the electromagnetic controller with which it is desired'to'associate the control unit. In

the instance disclosed, the extension 73 is connected by means of the link, 7 5 (see Fig. t

.1. to the crank 76 associated with the she.

to the electromagnetic operating mechanism.

.. The control unit has 8 been illustrated in Fig. 7, as it, may be appliedin an electromagnetically actuated control of the same v eneral type as shown in applicants co-pendmg application, Serial- No. 387,237, filed June .7, 1920. The control unit has been thus shown in order that the functions and operation of the various parts thereof may 'be'better understood, but as hereinbefore noted, it is'to be understood, that the control unit is applicable to many other forms of electromagnetically actuated controllers as will be apparent to .those skilled in the art, one-other mode of application being shown in Fig. 8.

Referring now" more particularly to Fig.

7, the electromagnetic actuating mechanism is here shown as comprising an armature 78, having the legs 79, 80 operatively. lbcated with respect to the starting control coil'or magnet 83 and a running control coil or magnet 84. One terminal each, of the latter coils, is connected to the conductor 86 at the point of connection 85. The conductor. 86 is connected to one terminal of the normally closed switch 87; the other terminal of saidswitch is connected to conductor 88; Terminal 89 of magnet 22 is connectible to conductor 88. Contact 35 of the control unit is connectible to conductor 90, the other end of which is connected to starting control 'coil 83; Contact 34 of the control unit IiS 'COIlI18CtlblQ 'toconductor 91, which is connected to running control coil 84. Terminal 92 of the control unit is connectible to conductor 93, connected to one line 94 of the polyphase supply. A normally open switch 95 has one of its terminals connected to conductor 93 and the other to conductor 88. Terminal 96 of the control unit is connectible to conductor 97 which is connected to line 98 of the polyphase supply. Terminal 89 of the control unit is also connectible to conductor 99 connected, to one terminal of the impedance 100 here shown as connected to the contacts 101 of any desired number of Y abnormal condition relays. The motor controller proper is provided With movable con- .tacts 102 and stationary starting contacts 103 and stationary running contacts 104'. The

movable contacts and their operative relation to the armature 78 are indicated -diagrammatically in side elevation by the contact actuating mechanism 3 associated with shaft 77, and the movable contact m. The starting and running contacts are indicated by the reference characters 8, 1', respectively.-

Inasmuch as it is immaterial as far as the I invention herein claimed is concerned in what specific manner the motor is controlled, it is suflicient to say that the motor 105 is so connected that when the movable contacts are thrown to the right in the figure, a reduced potential will be applied to the motor and when they are thrown to the 1eft,.the motor will be connected directly to the line.

It will be seen that but a single mechanical connection is necessar' between the con,- trol unit and the control er to be automatically controlled. All of the parts of the control unit'may therefore be mounted on a "single board, as has already been clearly .set forth, and thisboard may be mounted on any suitable and desired part of the .switch to be controlled, as for example, the

rail 108 (Fig.1). .A1l that is then necessary is to make the appropriate electrical connections, and'one wayin which this may .be done has been illustratedin Fi .7. A motor controller, for example,'may;t erefore be manufactured and sold with merely an ordinary non-automatic electromagnetic actuating mechanism, and rendered automatic at any. time by the bodily addition of a control unit. Difl erent sizes'and types of controllers may, moreover, be manufactured and-the sameform of control unit may be associated with any one of them.

The operation of the control unit, whenconnected as shown in Fig. 7, is. as follows: if the switch 95 is closed, current will flow through conductor 93, switch 95, switch 87, conductor 86, startin coil 83, conductor 90,

line wire 98,'thus energizing coil 83 and attracting leg 80 of the armature. This will throw the movable contacts 11 into engagement with contacts 8 andwill rotate the crank 76 in a counter-clockw'isc direction, as viewed in Fig. 7, whereby the tube 5 will be lifted to a predetermined extent. Upward movement of the tube causes the spring 82 to engage the armature 21, thus causing the. lever 23 to swing about the pin 44 as a fulcrum and causing engagement of contact 25 with stationary contact 31. The parts will then be in the position shown in Fig. 5.

The engagement of contacts 25, 31 bypasses or shunts the switch 95, so that as soon as the operator lets go of the actuating member of switch 95, thereby permitting the switch to open, thecircuit previously traced contacts 35, 33, termlnal 96, conductor 97 to i through the starting control coil 83 will be the motion being predetermined by the setting of the dash pot. When the lever 14 comes to an engagement with the screw 59 (see Fig. 3) on trip member 58', the latter is swung so as to cause the extension 56 on the trip member to disengage latch 45 from in 44. The lever 23, being biased upwardy by the pull of magnet 22 onarmature 21,

will swing about stationary contact 31 as a fulcrum, causing contact v33 to leave con tact 35 and engage contact.34. This transfers energization from. starting. coil 83 to running coil 84 by way of line conductor 98, conductor 97, terminal 96, contaclB 33, 34, coil 84, conductor 86, switch'87, conductor 88, magnet 22, contacts31, 25, terminal 92,

and through conductor 93 to line conductor 94. The resulting energization of coil 84 attracts leg 79 of the armature, throwing the movable contacts m into. engagement with contactsr, and by the clockwise rotation of crank 76, moves the tube 5 downward. The

plug -19 and the collar 81 soon come 'into engagement and the downward movement of the collar pulls the armature 21 away from magnet 22, thereby breaking contact between contacts 25, 31. The lever may be considered, during this action, as turning about pivot 65 as a fulcrum. This movement deenergizes magnet 22, and that portion of the circuit previously traced through magnet 22 from terminal 89, being interrupted, is replaced by conductor 99, impedance. 1.00, through abnormal relay contacts 101 to one of the other line conductors, as has been fully set forth in applicants copending case hereinabove referred to.

At about the same time that plug 19 engages collar 81, the extension 67 engages lock nut 69, thereby pulling rod 66 downward and pushing the right hand end of I lever 23 upward by means of link- 64. The

downward motion of pivot 24 and upward motion of pivot 65 causes the lever 23 to rotate in a counter-clockwise direction to assume the position shown in Fig. 6. The

contact 33 is therefore held in an engagement with contact 34 in spite of the 'deenergization of magnet 22 and the fact that the tube 5 has been moved in a downward direction. The C011 84 Wlll thus P81113111 energized until its circuit is broken by opening of the normally closed switch 87, or in some other manner as by. low voltage, or by the abnormal relay contacts 101, in the' instance disclosed.

Another mode of applying the control unit is illustrated in Fig. 8. The electromagnetically actuated controllerhere shown is of the type in which a motor is first directly connected to a supply line and then to the supply .line through fuses. The cont'roller includes a single movable switch member 109 carrying contacts 110, 111, 112. The latter contacts are connectible to the line conductors 113, 114, 115 of a polyphase supply in any desired predetermined order. The controller also includes stationary starting contacts 116, 117, 118 connectible to the terminals of a motor145, and stationary running contacts 11.9, 120, 121 connectible to the terminals of the motor 145 through fuses, or other circuit breaking elements 122, 123, 124. The movable switch member 109 is carried by a reciprocable rod 125, here. shown as movable in guides 126,.

127'. The rod 125 and the switch member 109 carried thereby are held in'an ofitor open circuit position by means of springs- 128, 129. The rod-125 carries cores or armar tures 130, 131 cooperable respectively with.

a. starting control coil 132 and a running control coil 133. Oneterminal each of the coils 132, 133" is connected to a conductor 134, the other end of which is shown as con- It is assumed that the motor 145 is of such switch 135. The other terminal of the switch 135 is connected to one terminal of a normally open switch 136, the other terminal of which is connected by conduetor 137 to line 113. The contact 34 of the control unit is connectible by means of conductor .138 to the I remaining terminal of coil 133. The contact 35 of the control unit is connectible by conductor 139 to the remaining terminal of coil 132. The terminal 96 is connectible by conductor 140 to line 115; terminal 89 is con.- nectible by conductor 141 to a point of connection 142 between'the switches 135, 136;. and the terminal 92 is connectible by con ductor 143 to line 113.

Motion may be transmitted to the tubular member 5 through the clamp 68 and exten v sion 73 by any suitable means asby an extension 144 clampcd on the rod 125,.through the link 75. It is clear, however, that thisconnection may be of any suitable or desired form, 'as long as the appropriate motion is transmitted from some movable portion of the switch mechanism to the control unit.

The operation of the control unit when connected as shown in-Fi'g. 8 is as follows: If the switch 136 is-closed, current is supplied to the starting'control coil 132 by way of conductor 137, switch 136, switch 135, conductor 134, coil 132, conductor 139, contacts 35, 33, terminal 96 and through conductor-140 to line 115. Energization of coil 132 attracts the core 130, thereby moying switch 109 to bring contacts 110, 111, 112 into engagement with contacts 116, 117 118.

type that it is possible to throw it directly across the line in this manner. Upward motion (as viewed in Fig. 8) of the switch 109 causes similar motion of the tube 5 thereby causing closure of contacts 25, 31 as he'reinbefore explained in connection with'Fig. 7. Closure of the latter contacts by-passes switch 136 by means'of the following circuitz'conductor 143, contacts 25, 31, coil 22, conductor '141 to point of connection 142. Coil 132, therefore remains energized even though switch 136 is released, and energizav tion of coil 22 holdscontacts 25, 31 in en-' ga'gement, Meanwhile spring 106 has ex- 115 ferring energization from coil 132 to :coil

133, the following circuit being established: contact 140, terminal 96,- contacts33, 34, conductor 138, coil 133,-conductor 134, switch 135, conductor 141, 'coil 22, contacts 31, 25',

terminal 92 through conductor 143 to line 1 I 113. .It will be observed upon comparing Fig.8 with Fig. 7 that the'impedance coil 100, conductor .99 and relay contacts 101 are omitted in Fi 8, the electroma etic switch, controlle by the control unit eing name-re mined by the nut 69 and the limit of motion of the extension 67, is such as to cause an upiward motion of link 64 to a position ere the pivot pin 65 will no longer act as a fulcrum for the lever 23, as described in connection with Fig. 7. Stated in other words, the collar 81 is not lifted high enough so that there will be effective engagement between the lug 19 and said collar, and therefore the core 21 will not be pulled out of coil 22 nor will the connection between contacts 25, 31 be broken. The foregoing result is possible by reason of the fact that considerable leeway is provided in the position of the, button-like contact surface 33 on the contact 34. It is thus possible to so adjust the control unit by means of the lock nuts 69, so that when the tube 5 is moved from its upper to its lower limiting position, contacts 25, 31 will or will not remain in engagement.

From the above described applications, the great flexibility of the control unit will be apparent.

It should be understood that, while two specific uses -for the disclosed electromagnetic switch have been illustrated, other uses and relations will readily suggest themselves to those skilled in the art and it is not desired to limit the invention claimed to the exact uses and details of construction ierein shown and described.

I claim 1. In combination with a motor controller of the type having electromagnetically actuated means for connecting a motor in starting relation to a source of supply and for connecting it in running relation to said supply, of self-contained means comprising operatively assembled elements mounted on a common support and detachably associated with said controllerfor causing said electromagnetically actuated means to automatieally connect said motor in starting re lation for a predetermined time and then to connect it in running relation.

, 2. In combination with a motor controller of the type having electromagnetically actuated means for'connecting a motor in starting relation to a source of supply and for connecting it in running relation to said supply, of self-contained means comprisin operatively assembled elements mounted 0% a common support and detachably associated with said controller-including a single me-. chanical actuating connection between sald self-containedmeans and said controlier, for

causing said electromagnetically actuated means to automatically connect said motor in starting relation for a predetermined pime and then to connect it in running relaion. 1

3. A self-contained automatic electromagnetic device comprising operatively assembled elements mounted 011 a common support and mechanical actuating means conncctible by a single mechanical connection to an elcctromagnetically actuated controller of the double-throw type, terminals for said device connectible to a source of supply and to said electromagnetic actuating means, said device including means for causing said controller to remain in one of its positions for a predetermined time when said electromagnetic actuated means is energized and for then causing it to move to its other position.

4. In an'electromagnetic switching mech-' anism, a longitudinally movable tubular member, a lever having a stationary fulcrum, passing through openings in said tubular member, a dash-pot connected to the end of said lever, a rod carried by said lever and disposed within said tubular member, a compression spring around said rod and disposed between one end of said tubular memher and said lever, a magnet, an armature therefor, a rod associated with said armature and having its end disposed within said tubular member, a compression spring between the end of said armature and the end of said tubular member, a floating lever pivotally associated with said armature, contactsoperatively associated with the ends of said floating lever, stationary contacts for cooperating with said movable contacts, a latch for holding one end of said floating lever, means whereby said first named lever may trip said latch, and means associated with said tubular member for moving said floating lever in the same direction as effected by saidarmature.

5. In an electromagnetic switching mechanism, a longitudinally movable-member, a dash-pot, a compression spring, means whereby movement of said member in one direction compresses said spring thereby causing actuation of the piston of said dashpot, a magnet, an armature therefor, means, including a lost motion connection, whereby said longitudinally movable member may mined movement of said dash-pot piston for rendering said preventing means ineffective.

6. In an electromagnetic switching mech anism, a longitudinally movable member, a dash-pot, 'a compression spring, means whereby movement of said member in one direction compresses said spring thereby causing actuation of the piston of said dashpot,a magnet, an armature therefor, means, including a lost motion connection, whereby said longitudinally movable member may move said armature in either direction, movable contacts operatively associated with said armature, stationary contacts adapted to cooperate with said movable contacts, means for preventing engagement of certain of said contacts, means responsive to a predetermined movement of said dash-pot piston for rendering said preventing means ineffective, and means operatively associated with said longitudinally movable member for controlling said certain contacts.

7. In an electromagnetic switching mechanism, a longitudinally movablemember, enorgy-storing means, means whereby movement of said member in one direction stores energy in said energy-storing means, a magnet, an armature therefor, means, including a lost motion connection, whereby said longitudinally movable member may move said armature in either direction, movable contacts operatively associated with said armature, stationary contacts adapted to cooperate with said movable contacts, means for preventing engagement of certain of said contacts, means actuated by said stored energy for rendering said preventive means inetfective, and means for retarding said actuating means.

8. In an electromagnetic switching mechanism a longitudianlly movable member, energy-storing means, means whereby movement of said member in one direction stores energy in said energy-storing means, a magnet, an armature therefor, means, including a lost motion connection, whereby said longitudinally movable member may move said armature in either direction, movable contacts operatively associated with said armature, stationary contacts adapted to cooperate with said movable contacts, means for preventing engagement of certain of said contacts, means actuated by said stored energy for rendering said preventive means ineflective, means for retarding said actuating neans, and means operatively associated with said longitudinally movable member for controlling said certain contacts.

9. In an electromagnetic switching mechanism, a magnet, an;armature therefor, a floating lever pivoted to said armature, a movable contact actuated by one end of said lever, a stationary contact co-operable with said movable contact, a second movable contact actuated by the other end of said lever, a second stationary contact co-operable with said second movable contact, a latch for holding said other end of said lever in a position to prevent engagement of said second contacts, whereby when said armature is moved towards said magnet, said first contacts will come into engagement and if said latch is released said second contacts will come into engagement.

10. In an electromagnetic switching mechanism, a magnet, an armature therefor, a floating lever pivoted to said armature, stationary contacts disposed on one side of said lever on each side .of the pivot, a movable contact associated with each portion of said lever, and means whereby said lever is caused to oscillate so as to first cause engagement of the stationary and movable contacts at one end, then engagement of the contacts at the other end, and then disengagement of the contacts at the first end while said contacts at said other end remain in engagement.

--11. In an automatic controller of the type having a first-position control coil and a second-position control coil, a switch for controlling said first-position coil, a coil connectible in shunt to said control switch, a switch in said shunt circuit, a switch for transferring en-ergization from said "firstposition to said second-position coil, and a single armature actuable by said shunt coil for controlling both said shunt switch and said transfer switch.

12. In an electromagnetic switch mechanism, a magnet, an armature therefor, a floating lever pivoted to said'armature, stationary contacts disposed at one side of said lever on each side of the pivot, a movable contact associated with each portion of said lever, and means whereby said lever may be caused to oscillate so as to first cause engagement of the stationary and movable contacts at one end, then engagement of the contacts at the other end and'then at willas desired, disengagement of the contacts at the first end while said contacts at said other end remain in engagement.

13. In an electromagnetic controller of the 'type having a first-position control coil and a second-position control coil, a switch for controlling said first-position coil, a coil connectible in shunt to said control switch, a

switch in said shunt circuit, a. switch for transferring energization from said firs t position to said second-position coil and means for at will causing said shunt switch to open or not toopen when energization is transferred to said second position coil.

14. In combination with a motor controller of the type having connecting means whereby a motor may be connected in starting relation to a source of supply and then in running relation to said supply and having electromagnetically actuated means for controlling said connecting means, .of selfcontained means comprising operatively assembled elements including electromagnetic devices mounted on a common support for causing said elect-romagnetically actuated means to automatically connect said motor in starting relation for a predetermined time and then to connect it in running relation, said self-contained means being bodily removable Without disturbing said connecting means.

15. In combination with a motor controller of the type having a first position control coil and a second position control coil, a control switch for initiating en'ergization of said first position control coil, and connecting means controlled by said first position coil whereby a motor may be connected in starting relation to a source of supply and connecting means controlled by said second position coil whereby said motor may be connected in running relation to said supply, of self-contained means comprising operatively assembled elements including all necessary contactors mounted on a common support for automatically causing said first position coil to connect said motor in starting relation and with a delay to connect it in running relation, said self-contained means being bodily removable without disturbing either of said connecting means.

In testimony whereof, the signature oi the inventor is affixed hereto.

HERBERT WV. CHENEY.

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