US2287791A

US2287791A - Engine starter control apparatus

Info

Publication number: US2287791A
Application number: US734739A
Authority: US
Inventors: John B Dyer
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1934-07-12
Filing date: 1934-07-12
Publication date: 1942-06-30
Anticipated expiration: 1959-06-30

Description

4 Sheets-Sheet l T0 /GA//T//V J. B. DYER June 30, 1942.

ENGINE STARTER CONTROL APTAEATUS original Fild July 12, 19:54

June 30, 1942. J, BUYER 2,287,791

ENGINE STARTER CONTROL APPARATUS Original Fled'July l2, 1934 4 Sheets-Sheet 2 2MP n 1 ENTOR lla f @LF/MM5@ ATTORNEY June 30, 1942. J. s. DYER 2,287,791

ENGINE STARTER CONTROL APPARATUS y Original Filed July 12, 1954 4 Sheets-Shed. '.5

ATTORN EY June 3o, 1942. J, Bj DYER 2,287,791

ENGINE STARTER CONTROL APPARATUS Original Filed July l2, 1954 4 Sheets-Sheet 4 ATTORNEY Patented June 30,' 1,942

2,287,191 ENGINE STARTER CONTROL APPARATUS John B. Dyer, Dayton, Ohio, assignor to General Motors Corporation, Detroit, Mich., a corporation of Delaware Applicant July 12, 1934, serial No. 134,739

. Renewed November 8, 1939 21 emma (ci. 29o-3s) This invention relates to a system of control for the starting apparatus of internal combustion engines and particularly to those engines used on automotive vehicles.

'This application is a continuation in part of the copending application of John B. Dyer, Serial No. 653,983, led January 28, 1933, for Engine control system. That application discloses a circuit which requires the closing of the ignition switch and the closing of a switch coordinated with the engine throttle actuator in order to establish a relay magnet circuit whereby a starter control relay switch is closed in order to effect the completion of a `circuit to an electromagnetic device which causes an electric starting motor to be mechanically connected'to the engine and to be electrically connected with a current source in order to crank the engine.

'I'he present application describes and claims the electromagnetic gear-shifting and motorswitch closing device, claims to which were originally presentled in Dyers application, Serial No. 653,983, and were divided out; and the present application also discloses an which the said electromagnetic device originally disclosed in Dyers application, Serial' No. 653,983,

assembly unit in Figure 8 is a fragmentary sectional view on the line 8-3 of Figure 5; and

Figure 9 is a fragmentary view looking in the direction of arrow 9 cf' Figure 5 showing the starter switch relay, the bracket of which is broken away.

In Figure 1, 20 designaes a generator grounded at 2l and connected by a wire 22 with the current winding 23 of a reverse current relayf24. Winding 23 is connected with the frame 25 of relay 24 which frame supports a leaf spring hinge 26 to which one end of the armature 21 is attached. Armature 21 carries a contact 28 engageable with its stationary contact 29 carried by bracket 30 connected by wire 3| with an ammeter 32 connected by wires y33 and 34 with the battery 35 grounded at 36. This completes the generator to battery circuit. A voltage coil 31 is connected with the relay .frame 25 and is grounded at 33.

is combined structurally with the starte;` control relay switch.

Accordingly, the objects of the invention of the present application reside in certain improvements'l in electromagnetic devices whereby the efficiency of their operation, the durability vof their construction and the economy of their `manufacture are realized.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings wherein a preferred embodiment of the present invention is clearly shown.

In the drawings:

Figure l is a wiring' diagram illustrating the use of the present invention;

Figures 2 and 3 together show a fragmentary view of the engine starting apparatus equipped j with the electromagnetic device constituting a part of the presentinvention, said device being shown in longitudinal cross section;

'Figure 4 is a sectional view on line 4-4 of Figure 2;

Figure 5 is aperspective view showing the electromagnetic device of Figure 2 combined structurally with the starter switch relay 80 of Figure 1;

Figures 6 and '1 show in perspective certain disassembled parts of the unit shown in Figure 5;

The frame 25 supports a core 39 which is surrounded by the windings 23 and 31 although these windings are shown in the drawings as Vseparated from the core 39. The relay contacts 28 and 2 9 are closed to complete the battery -charging circuit due to the magnetic action produced by current flowing through the voltage winding 31 after the generator has attained a certain voltage. When the contacts 28 and 29 are closed, vcurrent then flows through the winding 23 which then cooperates with winding 31 to hold the armature 21 in position to maintain the contact 28 in engagement with the contact 29. It is therefore apparent that the relay can be adjusted so that its contacts will not be separated due to the action of the spring hinge 26 until after the voltage of the generator has fallen substantially below that voltage required for the closing of the relay contacts 28 and 29.

The main enginecranking circuit comprises the battery 35, wire 34, switch contact 40, movable contact 4l, switch contact 42, wire 43, starting motor 44 which is grounded at 45, and b'attery ground connection 36. The starting motor 44 .operates the shaft 46 along which slides a sleeve 41 which is splinedly connected to the 'shaft 46 and which is operatively connected through a one-way or overrunning clutch 48 with a pinion 49 engageable with the engine ywheel gear 50. The sleeve 41 is surrounded by a grooved collar 5l which isslidable along the sleeve 41 but normally is held against a shoulder 52 at the left end of the sleeve 41 by a spring 53 interposed between the collar 5I and the clutch 43. vThe collar 5I is caused'to move toward the right in the drawings by lever 54 pivotally mounted upon a shaft 55 and carrying at its lower end a pin 56 received by the groove of the collar 5|. Movement of the lever 54 counterclockwise will cause the sleeve 41 to be moved toward the right andthe pinion 49 to become engaged with the y-wheel gear 50. ,The pinion 49 is Withdrawn `from the gear 50 by the operation of a spring 51 which surrounds the shaft 55 and bears at one end against a stationary stop 58 and at the other against a stop 59 carried bythe lever 54.

The lever 54, shown in Figs. 2 and 3 is actuated and the

switch

40, 4| 42 is closed by electromagnetic means which comprises a solenoid core 60 and a. solenoid armature 6| which are surrounded by

electromagnet windings

62 and 63. The solenoid core 60 is provided with a central bore for receiving a horizontally slidable plunger or rod 64 provided with two shoulders |66 and |19 betwen which an insulatingly mounted movable contact 4| is relatively slidable. A spring |14 'urges the contact 4| against the shoulder |66. The rod 64 is normally held in the position shown in the drawingswith its shoulder |19 bearing against the magnet core 60 due to the action of a spring |64 bearing at one end against the shoulder |66 and at the other end against a stationary part |56 having a projection |62 telescopically fitting within a recess or central bore 6| in the rod 64. The solenoid armature 6| is connected by a pin 14 with a link 15 which carries a stud 16 received by a slot 11 provided in the upper end of the lever 54.

When suflicient current passes through the

windings

62 and 63, the armature 6| is -caused to move toward the left in order to effect counterclockwise movement of the lever 64 and the movement of the pinion 49 into mesh with the engine gear 50. This movement of the solenoid 6| also causes the rod 64 to move to the left carrying with it, due to the action of the spring |14, the switch contact 4| which is yieldingly pressed into engagement with the

contacts

40 and 42 due to the yielding action of the spring |14. When this occurs, .current will flow from the battery to the motor 44 thereby causing rotation of its armature shaft 46 and the pinion 49 driven thereby through the splinedly connected sleeve 41 and the overrunning clutch ing the iiy-wheel gear 50 to rotate and the engine to be cranked for starting purposes. Should the engine fail to start and the pinion 49 fail to be withdrawn from the fly-Wheel gear`50 by the action of the spring 51, it is possible to open the circuit of the starting motor by disconnecting the

magnetcoil windings

62 and 63 from the storage battery, the connections to which are to be described later. When the

magnet coils

62 and 63 are deenergized, movement of the contact 4| away from the

contacts

40 and 42 by the action of spring |64 may take place due to the fact that the solenoid 6I may move toward the noid armature 6| operates to closet'he motor switch and to move the pinion 49 toward the gear 50, but after the pinion 49 collides with the gear 50, the spring 53 is compressed beyond its'initial state of compression. yThen when the motor shaft 46 turns to relieve the condition of gear tooth abutment, the spring 53 is released quickly to snap or jump the pinion 49 into engagement with the engine gear 50.

The" circuit for connecting the

magnet windings

62 and 63 with the storage battery 35 comprises the following circuit: Battery 35, wire 34, contact 40, frame 8| of the starter control relay 80, leaf spring hinge 82,

armature

83, 84, stationary contact 85, bracket 86, winding 63, ground connection 88 vand battery ground connection 36. Stop 83a limits upward movement of armature 83. The circuit of the other winding 62 includes` the foregoing circuit as far as the bracket 86. From the bracket 86 a wire 90 leads out to connect with the coil 62 which is connected by wire 90a with the vcontact 42. The circuit of coil 62 is completed to the battery through the motor 44 and

ground connections

45 and 36. It'is apparent that when the

contacts

84 and 85 closed, current will flow `throughboth windings wire 81,

, 62and 63 to cause the solenoid 6| to move to- 48, thereby caus`- right slightly although the lever 54 may not be meshing, it is possible to close the motor circuit in order that the pinion 49 may be rotated into meshing relation with the engine gear 50. This is possible due to the fact that the

motor switch

40, 4|, 4'2 can be .closed before the meshing of pinion 49 'withgear 50 takes place. The sole- 'bracket |02, contact gage contact 92, 95 and |06.

ward the left in order to shift the pinion 49 into Lengagement with the gear 50 and to close the

motor switch

40, 4|, 42. When the motor switch closes, the winding 62 will be short circuited. The winding 62 is made preferably of relatively coarse wire whereas the winding 63 is constructed of relatively fine wire. Both windings 62V and 63 are required to draw the armature 6i across to the core 60 but, when this relation has been established, the one winding 63 isall that is required to maintain this relationship. Therefore the winding 62, which consumes the greater amount of the current, is short circuited so that the starting motor will have adequate current for cranking the engine. f

The circuit ofthe engine startencontrol relay comprises battery 35, wire 34, wire 33, ammeter 32, wire 9|, stationary contact 92 of ignition switch 93, movable contact 94, stationary contact 95, `wire 96,' switch 91, wire 98, relay magnet coil 99 surrounding core |00, wire |0I,

|03 cooperating with movable contact |04 insulatingly carried by armature 21 of cut-out relay 24, wire |05, and ground returns 30, l36 to battery 35. `When the movable switch contact 94 of ignition switch 93 engages contacts 92 and 95 it also engages a contact |06 connected by a wire |01 with the ignition apparatus of the engine. The 'switch 91 is one which is closed manually and is opened automatically when the enginel starts. The switch 91 is preferably actuated by the engine throttle actuator or accelerator pedal. It is opened automatically preferably by means responsive to engine intake suction. The switch contacts |03, |04 of the cut-out relay 24 are normally closed. To start the engine, the operator turns on the ignition switch 93 to cause the contact 94 to en- The operator closes the switch 91 preferably by means coordinated with the accelerator. This causes current to ow from the battery through the coil 99 of the starter control relay 80 whereupon contacts 84 and are closed, whereupon the magnet coils 62 and 63 are energized to effect the. shifting of the starterl pinion 49 into mesh with the contact of the starter relay. 80 are.

engine y-wheel gear and then closing of the

main motor switch

40, 4|, 42. The engine therefore starts in the manner described. When the engine becomes self-operative, suction produced by the engine will open the switch 91, and in response to the voltage of the generator 20 driven by the engine, the switch |03, |04 will be open. Hence the circuit of the coil 99 of the starter control relay 80 is opened by two switches connectecl in series to insure the discontinuance of the engine starting function as soon as possible after the engine becomes self-operative and the prevention of the operation of the starter thereafter or until the engine has stopped.

The construction of the magnet may be varied within certain limits, but it is desirable that the coil S3 shall contain a smaller number of turns than vthe coil 62, and the resistance of the coil 53 should be higher than the coil 62 so that the ow of current through the coil 63 isas low as possible to insure that the armature of the magnet be held in switch closing position during the cranking operation, so asto change that position as little as possible. it hasbeen found desirable to provide coils having such resistances that for a six volt battery system, the flow of current through coil 83 is substantially from 3 to i@ amperes and through the coil 62 from 46 to 5|) amperes before the starter switch is closed., The now of current through the coil 62 is very brief, as it takes an almost imperceptible time to eifect closing of the starting motor switch so that during most of the starting operation there is only from d to ampercs flowing through the coil b3 to hold the starting motor switch closed and the pinion in gear-engaging position.

lt has been found that in order to cause proper opening ci the

main starter switch

40, 4|, 42 upon opening of the ignition switch or the switch 91, the number oi turns in the inner, or pull in." coil 62 oi the starter magnet must be somewhatgreater than the number of turns in the outer, or hold in coil 63. This is truc because when either switch above referred to, is opened while the starter switch is closed, current` will lcw from the battery through 1the starter and Theoretically, it might be possible to effect opening of the starter switch 40, 4 I 42, with coils having the same number of turns, but owing to the residual magnetism of the magnet, inequalities in the wire resulting in varying resistances, and manufacturing inaccuracies, it is impossible'to use coils of the same number of turns as the magnetic flux might not reach zero value. To make sure that the flux pressure does always pass through the zero point, it is necessary to provide at least a few more turns in the inner coil than the outer.

The particular system shown in Figure l constitutes an improvement in the system disclosed Y in Dyers application #653,983, and is described and claimed in the copending application of John B. Dyer and William Earl Brown, Serial No. 735,102, led Jan. 9, 1934 which became Patent No. 2,105,723 on January 18, 1938.

Forms of accelerator-closed engine-suction opened switch 91 are described and claimed in the copending application of John 1 3. Dyer, Serial No. 734,740, iiled July 12, 1934, which became iatent No. 2,167,646 on August 1, 1939.

in Figures 2, 3 and 4, the specific construction ci the starter magnet is fully illustrated. Thismagnet comprises an outer shell |20 enclosing,

v an inner shell |22 which in turn encloses a spool thence through the coils of the starter magnet to ground, the direction of current in the inner coil being the reverse of that in the outer coil.

.fis a concrete example of the operation it may .be assumed that the switch S1 is opened by suction and the starter switch should open immediately. On opening of switch 91, however, current will ow from the battery to ground through connection 36 and from the batterythrough wire 34, the

starter switch

40, 4|, 42, wire 9| through the coil 62, thence through wire 90, wire 81, the coil 63 to ground 88, the direction of now through coil 62being reversed while the direction o flow through coil 63 remains the same. At this time the coils tend to neutralize each other and in order to insure that the magnetic flux passes through the zero point immediately, a. slightly larger number of turns are used in the inner coil 62. The outer coil G3 may comprise 122 turns of #16 B. E. copper wire, and the inner coil'12'l turns `of #111/2 B. E., copper wire. With this arrangement, as the flux passesl through the zero point upon reversal of polarity of the inner coil 62 on opening of the suction operatedI switch 91, the magnet becomes completely deenergized and the starter switch is opened by the lspring |64, as the spring 51 retracts the armature BI and demeshes the pinion 49.v

coils

Suitably secured by screws or in any other clesirable way at the end of th magnet opposite to that in which the armature slides is a housing |54 which encloses the

ilxed contacts

40 and 42 of the starting' motor switch, these contacts-being carried by a suitable bracket |56 secured by screws 56a to the endV washer |38 and'received within the housing |54. Y

The core 60 has an axial bore |50 in which the metal plunger 64 is adapted to slide and which normally occupies the position shown in Figure 2 with one of its ends projecting into the depression |46 so that itis adapted to be engaged by the armature 6| as the latter moves to the left upon energization of the magnet. The opposite end of the plunger 64 is bored at |6| and receives the pin |62 which is riveted in the bracket |56 and upon which the plunger 64 slides when engaged by the armature 6|. The spring |64 which normally holds the switch open is received between the bracket |56 and a suitable cup-shaped C-washer |66, which is received by a groove |61 of the plunger 64. Against the washer |66 normally rests a flanged collar |68 which is slidable upon the plunger 64 and has mounted thereon, between the flanges thereof, the movable contact member 4| of copper or other suitable metal. The contact member 4| has a central hole through which the collar |68 extends and which is larger than the collar and is separated therefrom by insulating washers |10, while between the contact member 4| and the flanges of said collar |68 are insulating washers |12. A spring |14 surrounds the plunger 64 and is located between a cupped washer |16 (not a C-washer) and a plain washer |18 held by the spring |14 against a C-washer |19 which is received by a groove |80 of the plunger 64. The spring |14 and the Washers |18 and |19 are received by a recess |8| provided by the core 60, as shown in Figure 2. The spring |14, therefore, exerts a pressure urg by a bracket |56b which is a modification `of at the starter switch during the engine cranking operation. Y

Figures 5 to 9 inclusive are views ofv a control unit comprising an electromagnet and motor switch, described in the foregoing paragraphs, combined with the starter switch relay in `a unitary structure.l In this form of invention the

contacts

40 and 42 of the motor switch are provided by the heads of bolts |84a vand |8211 respectively, which are longer than the bolts |84 and |82, shown in Figure 4.

, The

contacts

40 and 42 are formed on the ends of binding posts |84 and |82 respectively, to which the

wires

34 and 43 are respectively connected, suitable insulating washers being provided to insulate the contacts from the supporting bracket and suitable means being provided to connect the wires referred to, to the binding post. In case the starter control relay 80 is not directly associated with the starter magnet unit as shown in Figure 2, the bracket |56 was provided with a binding post |86 to which the

wires

90 and 81 may be attached.l In other Words, the binding oost |86 is the equivalent of the bracket 86 of the diagram to which the

wires

81 and 90 are shown to be connected.

A bolt .|90 which is screwed into the armature 6| and which carries the pin 14 connecting with the link 15 secures to the armature 6|, a washer |9| which is adapted to be engaged by the enlarged head of the bolt |90 so that a leather shield |92 may be clamped between the washer and the armature. 'This shield is adapted to be fitted around the neck |35 and clamped in position by a split clamp |83 which surrounds said neck and lies outside thef'leather shield. The purpose of this shield is to prevent dirt and moisture from reaching the armature.

The magnet frame |20 is secured to a bracket |95 by which the starter magnet assembly may be Amounted upon the frame of the starting motor in order that the magnet armature 6|r may be properly associated with the pinion shifting lever 54.

The magnet upon energization veffects three functions seriatim. As the armature moves to the left when the magnet is energized during the rst part of its movement and before it engages the plunger 64, it Ashifts the starter pinion 49 into engagement with the fly-wheel gear 50, then during its continued movementand before it engages the core 60, the plunger 64 is moved to rst move the contact 4| into engagement with the

contacts

plates

200 and 20|, between which the bracket |561; is located, and

.insulating washers 202 and 203, located in the plane of bracket |56b, as shown in Figure 8.l

Between the head 42 of bolt |82a and the nonconducting plate 20|, and surrounding the bolt |82a, is a washer 90b serving as means for connecting the wire a, shown more clearly in -Figure 6, to the contact or bolt head 42, In

order to space the head 40 of bolt |84a the same distance from the non-conducting plate 20|, a

washer 205 is provided. The bracket 8| which supports part of the starter switch relay 80, as shown in Figure 1, is provided, as show-n in Figure 7, with a hole 2 |'0 to provide clearance for certain parts of the bracket |5617, and with holes 2| and `2|2l through which the bolts |82a and |84a extend. Both holes 2|| and 2|2 are substantially larger than the shanks of bolts |82a and |84a. The bolt |82a'is insulated from the bracket 8| by the insulating plate 200, insulating washer 2|3 located in the plane of the bracket 8|, and

The bolt |84a is elecwasher 222, a metal washer 223 and a lock washer 224 surround the bolt |82a. A nut 225 'cooperates with .the screw threaded portion `of bolt |82a. The tightening of this nut on the bolt |82a clamps between the nut and the head 42 of the bolt, the' washer 204, plate 20|, bracket |562), plate 200, bracket 8|, plate 2l'4, and

washers

222, 223 and 224. In order that the bolt |82a will not turn while tightening the nut 225, its shank is provided with a square portion 226 tting within a corresponding square hole in the plate 20|. Thus the bolt |82a is insulatingly supported by the bracket |56b and insulatingly supports the bracket 8|. A second nut 221 and lock washer 228 are used to attach lto the bolt |82a to wire 43,`

shown diagrammatically in Figure 1.

A non-conducting washer 230 surrounds'the metal sleeve 220; a plain washer 23| and a lock washer 232 surround the bolt |84a. A nut 233 cooperates' with the threaded part of bolt |8411. The tightening of nut 233 on the bolt 84a clamps between the said nut and head 40 of bolt |84a the metal washer 205, non-conducting plate 20|, bracket |5612, non-conducting plate 200, the bracket 8|, non-conducting plate 2|4, metal sleeve 220, non-conducting washer 230, plain washer 23| and lthe lock washer 232. Thus, the bolt |84a is insulatingly supported by the bracket ported by the frame and actuated by the armature, a bracket supported nby the frame and pro-l ib and supports the bracket 8| and is electrically connected therewith. In order that the bolt iBa will not turn when tightening the nut 2233, the bolt is provided with a square portion 236 fitting within a corresponding square hole in the plate 20|. Bolt |84a is provided with a lock washer 23T and a nut 238 by which thel wire 34, shown in Figure 1, is secured to the bolt |84a.

Referring to Figures 5, l and 9, the bracket B6, shown diagrammatically in Figure 1, is secured to the bracket di by rivets 240, and is insulated from bracket iii by' means including an insulating plate itil. These rivets 24d also secure to the bracket di

terminal plates

242 and 243 to which the end leads ci coil t@ are respectively connected. These plates M2 and 263 carry

screws

244 and 245 respectively by which the wires 98 and ||ll are respectively connected to the plates 242and 243. Plates M2 and 2&3 are, of course, insulated from each other and from bracket 8| by non-conducting plates Mii, Ztl and 248. As shown in `ligure i, the bracket is connected to wires @il and 8l. Referring to Figures and 6, the wires il@ and 8l are fastened to a common terminal clip tt, which clip is secured by screw 25| to bracket d6, said screw passing through a threaded hole 252 in said bracket.

When describing Figure l it was stated that the armature til is supported by a leai2 spring hinge t2 which tends to move the armature 83 against a stop tta and to separate contact 84 from contact As shown in Figures 5, and 9, the spring t@ is assisted by a spring 26d fixed at one end to the armature 33 and having its free end bearing against a stop 26 provided by a plate 262, which is held in place by the core |09 of the relay and which is provided with an ear 263 which is equivalent to said stop 83a, shown diagrammatically in Figure l. A

While the embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

l. An electromagnetic device comprising, in

combination, a frame, an electromagnet carried by the frame, an armature cooperating with the electromagnet, a movable switch contact supported by the frame and actuated by the armature, a bracket supported by the frame, a stationary switch contact supported by the bracket and engageable by the movable contact, a second bracket supported by the rst bracket and electrically connected with the stationary contact, and a control switch for the electromagnet carried by the second bracket and electrically connected therewith.

2. An electromagnetic device coxriprising,A in combination, a frame, an electromagnet carried by the frame, an armature cooperating with the electromagnet, a movable switch contact supported by the frame and actuated by the armature, a bracket supported by the frame,'terminal bolts carried by the bracket and providing stationary contacts engageable by themovable contact, a second bracket supported upon said terminal bolts and electrically connected with one of said bolts, and a control switch for the electromagnet carried by the second bracket and electrically connected therewith.

3. .An electromagnetic device comprising, in combination, a frame, an electromagnet carried by the frame, an armature cooperating with the eiectromagnet, a movable switch contact supapparatus having, motor provided with a viding a support for the movable contact, a spring supported by the bracket and urging the movable Contact away from the bracket, a stationary switch contact supported by the bracket and engageable by the movable contact, a second bracket supported by the rst bracket and electrically connected with the stationary contact and a control switch for the electromagnet carried by the second bracket and having one-contact electrically connected therewith and another Contact electrically connected with a winding of the electromagnet.

i. An electromagnetic device comprising, in

combination, a frame, an electromagnet carried by the frame, an armature cooperating with the electromagnet, a movable switch contact supported by the frame and actuated by the armature, a bracket supported by the frame, terminal bolts carried by the bracket and providing stationary contacts engageable by the movable contact, a second bracket supported upon said terminai bolts and electrically connected with one of said bolts. means electrically connecting the other bolt with a winding of the electromagnet and a control switch for the electromagnet carried by the second bracket and having one contact electrically connected therewith and another contact electrically connected with a winding of the electromagnet.

5. In an electromagnetically controlled engine starting apparatus having, in combination, an electrical motor provided with a field frame, an armature rotatable thereinand adapted when rotated to operate the engine, a means for controlling the operation of the motor comprising magnet housing mounted on top oi the motor frame, windings within the housing, magnet armature slidably supported by the magnet housing, a switch for controlling the operation ci the motor and also supported by said magnet housing and means for connecting the magnet armature with said switch to operate the latter.

6. in an electromagnetically controlled engine starting apparatus having, in combination, an electricV motor provided with a field rframe. an armature rotatable therein and adapted when rotated to operate the engine, a means vfor controlling the operation of the inotor comprising a magnet housing mounted on top of the motor frame, windings within the housing, a magnet -motor and also supported by said magnet housing, means for connecting the magnet armature with said switch to operate the latter, and means for causing the magnet armature to operate the switch only after a substantial portion of the movement of the magnet armature has taken place.

7.In an electrically controlled engine starter in combination, an electric iield frame and a shaft rotatable therein which, when rota-ted, is operable to rotate the engine shaft, a means for controlling the operation of said motor comprising a magnet having a housing mounted on top of the motor frame, windings within the housing, a magnet armature slidably supported by the magnet housing and movable in a path substantially parallel to the axis of the motor shaft, a switch for controlling the operation o! the motor also supported by the magnet housing, and means whereby said switch is operated by the magnet armature.

8. Inv an electrically controlled engine starter apparatus having, in combination, an electric motor provided with a eld frame and a shaft net housing and movable in a path substantially parallel to the axis of the motor shaft, a switch for controlling the operation of the motor also supported by the magnet housing, and means for operating said switch extending into the path of movement of said armature whereby said switch operating means is engaged by the armature during its movement.

9. In an electrically controlled engine starter apparatus having, in combination, an electric motor provided with a field frameand a shaft rotatable therein which, when rotated, is operable to rotate the engine shaft, a means for controlling the operation of said motor comprising a magnet having a housing mounted on top of the motor frame, windings within the housing, a magnet armature slidably supported by the magnet housing and reciprocable in a path substantially parallel to the axis of the motor shaft, a switch for controlling the operation of the motor also supported. by the magnet housing and means for operating said switch comprising a member extending into the path of movement of 1 said armature and engageable by. said armature as it moves in one direction to close the switch.

10. In an electrically controlled engine starter apparatus having, in combination, an electric motor provided with a eld frame and a shaft rotatable therein which, when rotated, is operable to rotate the engine shaft, a means for controlling the operation of said motor comprising Vva magnet having a housing mounted on top of the motor frame, windings within the housing, a magnet armature slidably supported by the magnet housing and ,reciprocable in a path substantially parallel to the axis of the motor shaft, a switch for controlling theoperation of the motor supported by the end of said housing and toward which the armature moves as the magnet is energized and a member for operating said switch and adapted to be l,energized by said armature and moved to `close the switch when said armature is moved upon energization of the magnet.

11. In an electrically controlled engine starter apparatus having, in combination, an electric motor provided'with a field frame anda shaft rotatable therein which, when rotated, is operable to rotate the engine shaft, av means for controlling the operation of said motor comprising a magnet having a housing mounted on top of the motor frame, windings within the housing, a. magnet armature slidably supported by the magnet housing and reciprocable in a path substantially parallel to the axis of the motor shaft, a bracket'supported at one end of the magnet housing, a switch for controlling operation of the motor having fixed contacts supported by said bracket and a movable contact supported by said bracket and the magnet housing and adapted to be moved into engagement with a fixed contact to close the motor circuit by said reciprocable armature.

12. In an electrically controlled engine starter apparatus having, in combination, an electric motor provided with a eld frame and a shaft rotatable therein which, when rotated, is operable to rotate the engine shaft, a means for controlling the operation of said motor comprising a t Vmagnet having a housing mounted on ltop of the motor frame, windings and an armature within the housing, a bracket supported by the magnet housing, a switch for controlling operation of the motor having fixed contacts supported by said bracket, a movable contact adapted to cooperate with said iixed contacts and meansA for mov-l ing said movable contact into engagement with said xed contacts to close the motor circuit upon energization of said magnet.

13. In an electrically controlled engine starter apparatus having, in combination, an electric motor provided with a eld frame and a shaft rotatable therein which, when rotated, is operable to rotate the engine shaft, a means for controlling the operation of said motor comprising a magnet having a housing mounted on topof the motor frame windings within the housing, a magnet armatura slidably supported by the magnet housing and reciprocable in a path substantially parallel to the axis of the motor shaft, albracket supported at one endof the magnet housing, a switch for controlling operation of the motor having fixed contacts supported by said bracket and a movable contact carried by a supporting member supported by the bracket and magnet housing and'movable relatively thereto,

, said member being moved by the magnet armature when the magnet is switch.

14. In an electrically controlled engine starter apparatus having, in combination, an electric motor provided with a field frame and a shaft rotatable therein which, when rotated, is operable to rotate the engine shaft, a means for controlling the operation of said motor comprising a magnet having a housing mounted on top of the motor frame, windings and an armature within the housing, a bracket supported by the magnet housing, a switch for controlling operation of the motor comprising fixed and movable contacts supported by said bracket, and a second switch also supported by said bracket for controlling operation of the magnet.

15. In an electrically controlled engine starter apparatus having, in combination, an electric motor provided with a cld frame and a shaft rotatable therein which, when rotated, is operable to rotate the engine shaft,a means for controlling the operation of said motor comprising a magnet having a housing mounted on top of the motor frame, windings and an armature within the housing, a bracket supported by the magnet housing, a switch for controlling operation of the motor comprising xed and movable contacts supported by said bracket, a second switch also supported by said bracket for controlling the operation of the magnet and a second magnet supported by said bracket for controlling the operation of said second switch.

16. In an electrically controlled engine starter apparatus having, in combination, an electric motor provided with a eld frame and a shaft energized to close said rotatable therein which, when rotated, is operthe motor comprising fixed and movable contacts supported by said bracket and operable by said armature when the 'magnet is energized, a second switch also supported by said bracket for controlling the operation of said magnet and a second magnet also supported by said bracket for controlling the operation of said second switch.

17. In an electrically controlled engine start ing apparatus having, in combination, an electric motor provided with a iield frame and a rotatable motor shaft adapted when rotated to operate the engine, a means for controlling the operation of said motor comprising a magnet having a housing mounted on top of the motor frame, a winding assembly within the housing comprising a tubular sleeve of nonmagnetizable metal and windings surrounding the sleeve, a core, cover plates at the ends of said housing for supporting the sleeve and core, an armature slidable lwithin the sleeve and movable toward the core, a switch supported on one of the cover plates and controlling the operation y of said motor, and a switch operating rod extending through the core to a position to be engaged by said armature and moved thereby to a position to close said switch upon energization of Asaid magnet.

18. In an electrically controlled engine starting apparatus having, in combination, an electric motor provided with'a field frame and a rotatable motor shaft adapted when rotated to operate the engine, a means for controlling the operation of said motor comprising a magnet having a housing mounted on top of the motor frame, a winding assembly within the housing comprising a tubular sleeve of nonmagnetizable metal and windings surrounding the sleeve, a core, cover plates at the ends of said housing for supporting the sleeve and core, an armature slidable within the sleeve and movable toward the core, a switch for controlling operation of said motor and hav- Ving stationary contacts carried by a bracket supported on one of said cover plates, a switch operating rod supporting a movable contact and extending through the core into a position to be engaged by said armature and moved 'to a position to engage the movable contact with said xed contacts upon energization of said magnet.

19. In an electromagnetically controlled eno gine starting apparatus having, in combination,

an electric motor provided with a eld frame, an armature rotatable therein and adapted when rotated to operate the engine, a means for controlling the operation of the motor comprising a magnet housing mounted on top of the motor frame, windings within the housing, a magnet armature slidably supported by the magnet housing, means for preventing any rotary movement of the armature as it slides within the magnet housing, a switch forcontrolling the operation of the motor and also supported by said magnet housing and means for connecting themagnet armature with said .switch to operate the latter.

20. In an electromagnetically controlled engine starting apparatus having, in combination, an electricmotor provided with a field frame, an armature rotatable therein and adapted when rotated to operate the engine, a means for controlling the operation of the motor comprisinga magnet housing mounted on top of the motor frame, windings within the housing, a magnet armature slidably supported by the magnet housing, a sleeve within which the yarmature slides provided with a key on its inner surface, said armature having a slot formed in its outer surface for cooperation with said key to prevent any rotary movement of the armature, a switch for controlling the operation of the motor and also supported by said magnet housing and means for connecting the magnet armature with said switch to operate the latter.` v

21. In an electromagnetically controlled engine starting apparatus having, in combination, an electric motor provided with a field frame, an armature rotatable therein and'adapted when rotated to operate the engine, a means for controlling the operation of the motor comprising a magnet housing mounted on top of the motor frame, windings within the housing, a magnet armature slidably supported by the magnet housing and having a slot formed in its outer surface, a thin metal sleeve within which the armature slides, said sleeve being bent inwardly at a point on its periphery to form a key for cooperation with said slot to prevent any rotary movement of the armature, a switch for controlling the operation of the motor and also supported by said magnet housing and means for connecting the magnet armature with said switch to operate the latter.

JOHN B. DYER.