US1126676A - Ignition-dynamo. - Google Patents

Description

G, T. MASON.

IGNITIQN DYNAMO.

APPLICATION FILED JULY 26. 1913.

Patented Jan. 26, 1915.

3 SHEETS-SHEET I.

0. T. MASON, IGNITIOH DYNAMO.

APPLICATION FILED JULY 1913 1,126,676. Patented Jan. 1915.

3SHEETSSHBET 2.

G. T. MASON.

IGNITION DYNAMO. APBLIGATIOK FILED JULY 26, 1913.

1,126,676, Patented Jan. 26, 1915.

3 SHEETS-SHEET 3.

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CHABLESTHQMAS MASON; OF.SU1VTER; SOUTH'CAEOLINA, ASS IGNDR TO IISUMTERI ELECTRICAL COMRANY,.A-COR1?ORATIONOF SOUTH: CAROLINA.

IenrrIoiLnYnni/io.

Specification of Letters Patent" Patented Jan; 26, 1915;

Application filed-Tilly 26; 19133 Serial No'. 781 414;

which are used inignition systemsuforgas J engines and the like.

Specifically it has to dowith the=designn and arrangement of a high tsnsion-magnetm type of dynamo machine; Heretofore ma l chines ot this type have been ofnecessit'y complicated, with: many parts, .difiicnlt. toe

' adjust, and very liable to get-out-ot order.

l Vith these objections inmind, I have heretoforeinven-ted an improved type. otma chine,1which.isl' disclosed and vclaimed in my prion application Serialwll oi 692,754, filed April 23, 1912.. The. principle oftha-tyinven tion was described in the. sai'dzapplication as embodied in the best form then known to me. The leadingiobject of mypresent inven tion, is to adapt my inventionrdisclosediin the aforesaid application, so asto produce a complete and commercially practicableima. chine, in which and by which all the benefits of the invention can be fully realizedz Some, of the. benefits thussonght may be briefly. stated as follows: simplified construction of the machine, involvingwery few parts and the elimination of all collector brushes ormoving contacts between ithe primary of the: generating coil and the: interrupter contacts, the possible operationof. the machine at Yery high efficiency; the: arrangementof the partsso than by removingdhe-minimumnumber of fastening devices allzthe impentant and necessary parts may vbeiimmediatelyi exposed for testing or repair, and if desired the entire machine may be disassembled Without risk and with the certainty of successful reassembling away from the shop; the complete inclosure and protection of the Work, ing parts; increasing the degree ofinsula. tion between parts having a difference of potential in operation; the solidconnection and automatic combined adj ustment; of the circuit breaker and its; associated iCOll StTLlCz-fi tune, wherebythe-advanceand retard o fthe spark-will be accompanied by a corresponding ad uStment of the circuit breaker; etc.

. in: the i accompanying drawings illustrating the iinvention, the-complete specific designiandrcombination otparts'is shown, but many featuresand details of 'theconstruction'hereinadisclosedmaybe applied to any machine of this general: type, and'especia-lly to any'machinehaving'its windings carried" on -a-smovable secondary field structure in such a 11151111161" that the fiux through said windings is varied'for the purposeof generation. therefore, that while this is a detail'case,

disclosingzspecific combinations as well as specificforms, nevertheless i am not to be limiteditd the said specific. combinations, and

I contemplate all such non-essential Variations and changes therein orin; the individ- It should be clearly understood ual parts, as may fairly fall Within the-scope of this statement of invention and the appended cl'aims- Referring to' the-.dravvings, Figure 1 is a.

vertica l, longitudinal sectional. vieW' through a machine embodying my'invention. Fig. 2

is asectional View at right angles to Fig. 1. Fig: 3 is an end-elevation of the magneto witlnparts of the'casingbroken away to showwthe: interior parts, and with} the interrupter mechanism casing shown insection.

Fight is a side View of 'tlie'niagneto with side plate removed.

'Dliesame figures of reference denote the same parts Wherever they are shown.

1 denotesa permanent field magnet supportedby, but-not attached to, the usual base plate 'Q, which-is itself commonly attached to the-engm'e frameand carries the entire magneto.

end-plates 3 and i which support shafts 5 The polar extremities of 1 have suitable apertures in which are carried rotor and-.6 carrying the rotors 7 and Swhich are magnetically separated from each other by nonmagnetic block 9. Ballbearings l0 and 1.1 or other suitable-"bearings are provided in the end plates for the shafts of the rotor.

The end'plates 3 and 4 are spaced'apart by thsnon-magnetic rings 12 and l3, be+ TJWGG-DaWliiCil' a core strl'ictme is clamped, coinprising shbes 14 and- 15 and core member 16 supporting generating windings whichfnsually. consist of a primary 1? and int ' secondary 18. One end of each winding is grounded or connected to the core in the usual manner.

Supported on the end plate 4 and movable therewith, is an interrupter mechanism housing 19 inclosing interrupter contacts 20 and 21, the latter movable and operated by cam 22 mounted on shaft 5. Shaft 6 carries a gear 23 engaging gear 24 carrying the dis' tributer brush 25 which in a well knownmanner distributes the high tension current to segments such as 26 and 27 whereby said current is properly distributed to the spark plugs of the several cylinders when the magneto is used on a multi-cylinder engine.

The circuits connecting the primary and secondary coils, the distributer, the intermagnets, and secured to the base by means rupter contacts 20 and 21, and the condenser 28 bridged across said contacts, are well known and Itherefore do. not show and describe the same, although hereinafter I shall refer to the improved means by which these various circuits areconnected with the various parts of the apparatus without the usual'fiexible wires or brush devices heretofore-employed.

It is obvious from a study of the figures and the foregoing description, that the magnet,s support the rotor, the iield structure carrying the windings and the interrupter mechanism, and that these parts are not connected to the base in any way and are therefore freely removable. To securely clamp these parts in operative position on the base, I employ side plates shown at 29- and 30, flanged at their upper portions so' as to engage and overlap the edges of the the base which need not be removed from the engine It is often necessary to examine the windings, and I provide means for accomplish,

ing this without removing the side plates 29 and 30, in the form of a cover 37, which may be separately removed by loosening I nut 61, thereby permitting the secondary field structure carrying the windings to be turned to the right, and the coil removed by pulling from between the jaws of the pole shoes 14 and 15, and bringing it out through the opening.

The core the core 16 carrying the same 16 is normally held in posit-ion:

by means of a connector 38 which is held under a screw 39 on the head of thecoil structure at one end and under a screw 40 insulated from the ring 12 on the other. This terminal 40 also connects to the core 42 of the insulated bridge piece 41 which carries the circuit from the. primary winding of the coil connected to 39, to the termihal 43 which is insulated from casing 19, and which connects by any suitable means such as the, wire 44 to the fixed contact 20 of the interrupter, it being understood that this contact 20 is suitably insulated from the interrupter casing.

The secondary circuit is led out of the secondary coil and connected to a support 45 carrying a small roller 46 adaptedto bear against and contact with the sector 47 connected to a terminal 48 for the connector 49 which carries the high tension current to a socket 50 connected in any suitable manner such as by conductor 51 to the distributer contact 52 where brush 25 carries the. current to distributer block 53 whence it is distributed to the various segments indicated at 26 and 27, as the distributer revolves. Sector 47 also connects to an insulated point 54, which is opposite a point 55 located on one of the end plates, this providing a safety gap or ground for'the high tension current. The safety gap contact 54, sector 47, and the terminal 48 for conductor 49, are all 'carrielgl on a block of insulation 56 held in the bend of the magnet in any suitable manner such as the bolt 35, which also clamps the side plates together at the top. The outwardly pressed portions or extensions 57 in plate 29, and in the door 37 in plate, 30, permit the field structure carrying the windings to be moved angular in relation to the poles of the magnet, around the-{center of rotation of rotor elements 7 and 8, thereby advancing and retarding the spark. To readily move this secondary field 1 structure the lever 57 is provided, attached between the interrupter casing and the magnets 1, or between the interrupter and a projecting flange 58 of the base. This can also be a projection on the casing 19.

It will be seen that the interrupter mechanism may be-removed entire from the end of the shaft 5 by simply loosening the terminal 43 and screw-59 which clamps the casing to the shoulder on end plate 4. It will also be noted that the coil can be removed, and after its removal, the strength of the magnets 'can be roughly ascertained by placing a suitable piece of iron across the jaws of the field shoes 14 and 15 between which the core 16 normally'fits, as by revolving the rotor, the flux is reversed and the strength of the, same roughly indicated by the strength of pull on the piece of iron. The distrlbuter plate carrying the entire distributer comprising brush, 25, distributer over and inclosing all par tributer gear 2a is pressed onthe outer cone of the ball bearing 62, while the in ca. I

'is earned on block ea.

Screw no block 6% to a shoulderd plate so attac to' the plate 36. The d striouter b1- is carried on the outer face of gear p ns 67 and carries two brushes the centez one 25 carrying current to one off c, r, which dlstributes to the segments :X,

as the gear 2% revolves. v -My improved construction elirnin brushes and sliding contacts of any between the primary of the coil and terrupter contacts and condense "t understood. that the condenser is located in the cap of the interrupter mechanism and is connected-in any suitable manner multiple with or shunt of the contacts 26 d As there are several Well known methods of connecting the condenser, i will not describe th 1nsame. It will also be observed that l: have eliminated all moving wires between. various parts. I lave the ea c, sparlr gap inside the bend the magnet Where it is out of the Way, and he vided a simple and direct for W tension current from the seco dary W. to the distributor.

Having thus descri ceo. nu. i I claim and desire to soon ent is 1. In dynamo, gene rotor and a core structu a base carrying the same, a br ends resting. upon the base, and. side clamped to the bridge has ering the lateral openings bridge.

2. In a dynamo, a at, i. ating coil and a rotor opera ive. associated therewith, said'field structure supported on the base and forming therewith closed figure with open sides Within which the other parts are housed, and side plates covering the side openings, secure 3 to the base and en gaging the field structure so as to clamp the same to the base.

' 3. In a dynamo, a base, aninveted U shaped field structure supported on said base, a rotor and gen rating; windings mounted Within the field structure, and side plates secured to the lease and fitting orer the edges of the field structure, so as to clamp the same securely to base and the same time completely cover and inclose the working parts of the machine. a

4. In-a dynamo, a base, an inverted l3- sha'ped magnetic field structure supported thereon to fornra bridge, a rotor and genping engagement with the upper th magnet structure so as to close the open si .e of the bridge, fully inclosing the Working parts therein and also clamping the ent're structure firmly to the base. An ignition dynamo comprising a base, primary field magnets supported thereon, a rotorand secondary field structure supported upon. ant, Within said magnets, and a pair of flanged cover plates secured to the base and extending over both sides of the magnets vith t; eir flanges overlapping the edges thereoiso as to clamp the magnets and inclosed carts to the base.

" iition dynamo comprising a base,

permanent field magnets supa generator coil and secli(i *truct re therefor vertically Within said magnets at right anereto, a rotor comprising a pair of Flt'lll'jtfil elements extending through and the magnet poles and adapted in 1 to ocuiduct the fling from each magalternately to the two pol s-o'f the pair of flanged cover magnets and having same to the base. I i inc comprising a base, b field magnets supoorted thereon, a enerator coil and secondary field u tiereior vertically s ffll'uill'l said magnets at right angles thereto, rotor comprising a pair of nductor elements extending through and between the magnet poles'and adapted in rotation to conduct the this. from each magnet pair aFern-atly to the two poles of the secondary held, and pairof flanged cover plates inclosing said magnets and having" air alternately to thetwo poles'of the to the base and extending up into n n to conduct the flux from each magremoval and testing of the coil and other ary field structure parts.

10. A magneto machine for ignition syssaid field magnet, said coil and its structure plane of said "plate, and also to permit corresponding travel of the said U-shaped connecting bar.

12. A magneto machine for ignition systems comprising the following instrumentalities: a base, an inverted U-shaped permanent field magnet structure supported on said base, a rotor, generating windings and I a secondary field structure therefor, all mounted within,xand between the poles of being adjustable around the axis of rota- "tion of the rotor, an interruptermechanism tems comprising the following instrumentalities: a permanent field magnet structure, a rotor, generating windings and asecondtherefor mounted Within and between the field magnet poles, and adjustable around the axis of rotation of the rotor, an interrupter mechanism supported outside of one of the field magnet poles, and

a. circuit connection from ;the generator Winding to the interrupter comprising a stiff metal strip or bar secured at one end to the coil and at the other end to a solid terminal on the coil structure in proximity to the rotor, the magnet pole on the interrupter mechanism, and an inverted U-shapedsolid connecting bar bridging said terminals around the magnet pole, and adapted to move in an i are to one side of said magnet pole upon ,rotary adjustment of the coil and secondary field on the interrupter.

11. A magneto machine for ignition systems comprising the following instrumentalities: a base, an inverted U-shaped permanent field magnet structure supported on said base, a rotor, generating windings and a 1 secondary field structure therefor, all mounted within and between the poles of said field magnet, said coil and its structure being adjustable around the axis of rotation of the rotor, an interrupter mechanism rotatably supported on'the outside of one of the magnet poles, and a circuit connection from the generating coil to the interrupter comprising a stiff metal strip or bar secured at one end to the coil and at the other end to a solid terminal supported on the coil structure in proximity to the rotor, a corresponding and related terminal supported on the interrupter mechanism outside the magnet pole, and an inverted U-shapcd solid connecting bar bridging said terminals around said magnet pole, said bar adapted to play in an arc to one side of the magnet pole during rotary adjustment of the coil and its structure and the interrupter, and side plates covering the open space between the limbs of the primary field magnet so as to inclose all the working parts except the interrupter, one of said side plates having an opening adapted to permit travel of thegenerating coil structure in its adjustment, through the a corresponding solid terminal outside rotatably supported on the outside of one of the magnet poles, and a circuit connection from the generating coil to the interrupter comprising a stiff metal strip or bar secured atone end to the coil and at the other end to a solid terminal supported on the coil structure in proximity to the rotor, a correspond ing and related terminal supported on the interrupter mechanism outside the magnet pole, and an inverted U-shaped solid connecting bar bridging said terminals around said magnet pole, said bar adapted to play in an arc to one side of the magnet pole dnring' rotary adjustment of the coil and its structure and the interrupter, and side plates covering the open space between the limbs of the primary field magnet so as to inclose all the working parts except the interrupter, one of said side plates having an opening adapted to permit travel of the generating coil structure in its adjustment, through the plane of said plate, and also to permit corresponding travel of the said U- shaped connecting bar, together with a cover for the said opening in the side plate, said cover formed up with a concavity to receive the coil structure when it is moved outwardly in adjusting, and a second concavity to receive and permit travel of said U-shaper connecting bar through its arc of adjustment.

13. In a dynamo electric machine, a base, a magnetic field structure supported on said base, a rotor and generating,windings inclosed within the space between the field poles, and covers or closures for said space extending across the field structure on each 1;; side and secured to the base so as to hold the field structure and working parts firmly thereto.

l-l. In a dynamo electric machine, an inclosing field structure having open sides, a 129 base supporting the same, a rotor and generating windings in operative relation to said field'structure, and a pair of clamping plates securing the magnet structure to the base and shaped so to inclose and prot ct 12's the working parts. 7

15. A dynamo electric machine comprising a field structure, a base supporting the same, a rotor, a secondary field or magnetic circuit operatively associated with the rotor, 13c

arrears ary field, and means on the primary field structure for holding said coil in place, said field stru'ctt'ir'e itself being clamped to the base by means of side plates, whereby detachment of the side plate fastenings per- 1nits all parts to be dissembled.

' ary sun 16. In an ignition dynamo, primary field magnets,a secondary field structure having adjustable poles, and means associated with the primary field for directing the fillX therefrom through said secondary poles alternately and oppositely, and a lever connected to" the secondary field, and adapted when moved to turn the same so as to effect an angular displacement of the secondp'oles to advance or retard the spark.

' 17. In an ignition dynamo, primary field magnets, a secondary field structure having adjustable poles, and means associated with the primary field for directing the flux therefrom through said secondary poles al ternately and oppositely, and a lever connected to the secondary field, and adapted when moved to turn the same so as to efiect an angular displacement of the secondary field poles to advanceor retard the spark, together With an interrupter mechanism mechanically' connected to and movable with said secondary field poles, whereby the single adjusting lever moves all the related parts as one unit.

18. In an ignition dynamo, the combination with the following instrumentalities: a field magnet structure having poles spaced apart from each other, a generating winding and a secondary field structure therefor with poles in the space between the primary field poles, a rotor composed of magnetically insulated opposite inductor elements mounted on connected shafts extending through the primary field poles, flanged bushings containing, bearings mounted in the primary field poles with other flanges inside the same and constituting journal boxes for the rotor shaft ends, mechanical connections from the secondary field poles to the flanges on said bushings, securing the same together as one unit, and a lever secured to one of said bushings outside of the primary field pole through WlllCh'it passes, and adapted to rotate the same together with the secondary field structure and the connected parts,

all as one unit, for the purpose of timing the spark delivered by the machine.

ing and a secondary field structure therefor 19. In an ignition dynamo, the combination with the following instrumentalities: a field magnet structure having poles spaced apart from each other, a generating windwith poles in the space between the primary field poles, a rotor composed of magneti-' callyseparated opposite inductor elements mounted on connected shafts extendingthrough the primary field poles, flanged bushings containing bearings mounted in boxes for the rotor shaft ends, mechanical connections from the secondary field poles to the-flanges on said bushings, securing the same together as one unit, and a lever secured to one of said bushings outside of the primary field pole through which it passes, and adapted to rotate the same together with the secondary field structure and the connected parts, all as one unit, together with a casing rigidly mounted on the outer end of said bushing, and receiving the end ofthe rotor shaft journaled in and extending through said bushing, interrupter mechanism carried in said casing, and an actuating cam therefor secured on the end of said rotor shaft, whereby movement of the lever will not only angularly adjust the secondary field poles by rotating the bushings, but will simultaneously adjust the position of the interrupter "contacts with respect to the actuating eam, for the purpose of correctly rod 35 extending through the space within the field magnet from side to side, and means for securing the cover plates rigidly thereto.

21. In an ignition dvnamo, field magnets, an adjustable generating coil in the space within the magnets, an insulating block mounted between the side limbs of the field magnets and above said coil, a fixed contact on said bloclnand a movable contact carried on the coil, together with circuit connections completed through said contacts.

22. In an ignition-dvnamo, field magnets,

side plates, an adjustable generating coil in the space within the magnets and secured to I the side plates. an insulating block mounted between the side plates and above said coil, a fixed contact on said block, and a movable contact secured to the coil and adapted to travel over and maintain circuit connection with the fixed contact throughout the arc of adjustment of the generating coil, circuit connections for said coil being completed thrlough said contacts in all positions of the cor 23. In an ignition dynamo, field magnets.

an adjustable secondary field structure and a detachable generating coil associated therewith 1n the space Wlthln the said-magnets, an insulating block mounted within the magnets above the coil, an arc-shaped friction strip secured on the block and hava ing its center of curvature coincident with the center ofarc of adjustment of the coil, and an anti-friction traveler on the coil lmaking contact with said friction'strip in all positions of thecoil throughout its normal arc of movement, whereby said coil is at all times held against displacement from the secondary field poles with which it is associated.

2a. In an ignition dynamo, field magnets, a generating coil and secondary field structure in the space within said magnets,v said coil being detachable from said secondary field structure, an insulating block mounted within the magnets and above the coil, an

' arc-shaped metal strip on said block, and a contact traveler on the coil and constituting a terminal thereof, said traveler and said strip remaining in contact through the normal" arc of travel of the coil and related parts, thereby mechanically holding the coil in position and electrically maintaining the circuit during 'said travel.

2-5. In an ignition dynamo, field magnets, a generating coil and secondary field structure in the space Within said magnets, said coil being detachable from said secondary field structure, an insulating block mounted .within the magnets and above the coil, an

arc-shaped metal strip on said block, and a contact traveler on the coil and constituting a terminal thereof, said traveler and said strip remaining in contact through the normal arc of travel of the coil and related parts, thereby mechanically holding the coil in position and electrically maintaining the circuit during said travel, together with means for normally limiting the travel of the coil and related parts in adjustment, but. adapted to permit continued movement when desired, to disengage said contact traveler from the strip and thereby break an inclosed generating coil and secondary the circuit and permit removal of the coil from the secondary field structure.

26. In an ignition dynamo, field magnets,

field structure, an insulating block inside the upper portion ofthe field magnets and a terminal, with a spark gap for limiting the operative potential, carried on said block.

27. In an ignition dynamo,'a field magnet structure, side plates covering the sides thereof so as to inclose a space. an insulating block mounted in said space between the side plates, and a safety spark gap and terminal countersunk in said block.

28. In an ignition dynamo, permanent field magnets, an adjustable generating coil,

a fixed contact terminal for said coil, and means carried on the coil and travellng over said fixed contact for conducting current directly from said coil to said terminal'in all. positions of the coil throughout its range of adjustment.

9-9. In an ignition dynamo, field magnets channel or cavity, a

said channel, and a cooperating contact car-- an adjustable generating coil and related partsmounted in proximity to said field magnets, an insnlatin block containing a xed contact strip in ried on the coil and traveling in the channel over said fixed strip asthe coil is adjusted, the circuit of said coil being com-.-.

pleted through said contacts.

30., In an ignitiondynamo, field magnets, a generating coil and cooperating parts mounted in adjustable working relation to said field magnet, an insulated terminal block mounted on said magnet and provided with a channel or cavity, a fixed contact strip mounted in the bottom of said channel, and a movable contact traveling on the same'and extending out of the channel into operative connection with the movable coil, whereby for all positions of the coil the working contacts are protected and insulation maintained at a high point.

31. In an ignition dynamo, a field magnet structure, generatingwindings and a power shaft, a pinion mounted on said shaft, a gear meshing with said pinion, a fixed casing about said gear, a distributer disk con nected with said casing, a plurality of contacts carried by-said disk, a moving contact cooperating therewith, a connection betweensaid moving contact and said gear, and ball bearing journal connections for said gear on the casing, whereby power from the shaft is transmitted through the pinion and gear to the traveling contact of the interrupter without friction.

32. In an ignition dynamo, a field magnet structure, a generating coil with a rotor and power shaft, a pinion 23 on the power shaft, a gear wheel 24: meshing therewith, a supporting plate or casing rigidly attached to the field magnet structure, two-part annular ballbearings, having one part or ring assoclated and connected with the gear wheel, a central block carrying the other part of the ball bearings, and afastening device extending through said central block securing the same and thereby the ball bearings firmly to the frame or casing, together with a distributer disk secured to the casing and contacts carried thereby opposite the gear,

associated therewith comprising the follow ing instrumen alities a plate. or-s pp'ort 36,

' to the base,

a hollow disk or insulating material socured on said support, a pinion 23 on the power shaft, and a gear wheel24 meshing with said pinion and underlying the said ining having an inner and an outer concentric ring with a raceway betiyeen them for the balls, said rings extending parallel to each other at right angles" to the gear wheel and lying within a recess formed therein, an opening in the casing concentric with but of greater diameter than the outer ring of the ball bearings, a back plate 66 receiving the thrust of bothrings on its face and hav ing an annular flange extending into the space between the outer ring and the casing, a central block 64, and a screw extending therethrough and tapped into the back plate, together with a movable contact 25 lyiiig within the hollow of the insulating disk Or block 60, and secured to the gear wheel 2-1 so as to be rotated thereby, the construction being such that by removing the block 60 and the screw 65, the gear wheel and associated parts will all come away as a unit including both parts of the ball bearings.

.34. in an ignition dynamo, a field structure, a power shaft'and generating parts, a base carrying the same, a support 36-secured a pinion secured on the power shaft rigid support, together with an insulating block overlying the gear wheel and carrying distributing contacts adapted to be actuated by said gear wheel.

In an ignition dynamo, field structure, a rotor and a detachable generating coil, together with a fixed contact carried by but insulated from the field, a cooperating,trayeling trolley contact carried on the coil and electrically connected thereto and a spark gap and distributer connected to the coil through said'contacts,

.' said coil being also mechanically held in place thereby. v/ 36. In an ignition dynamo, a field and a detachable movable generating coil, in coma magneticother parts.

bination with a trolley contactfor said coil,

coil in position. sulatmg disk, a two-part annular ball 'bear- 37. In an igniton dynamo, permanent field magnets having their opposite limbs substantially parallel, a generating coil and a power driven shaft with rotor connections, said shaft passing through and journaled in bearings in the magnet poles, and a distributer mounted on the outside of and par;

allel to one magnet limb, with driving gear connections to said power shaft.

38. An ignition dynamo comprising a permanent magnetic field structure with a power shaft journaled in bearings in its opposite limbs, a rotor and generating coil between the limbs, an interrupter outside of one limb carried on said limb and connected to the power shaft, and a distributer outside the other limbcarried on said limb and connected to the power shaft.

39. An ignition dynamo comprising a permanent magnetic field structure with a power shaft journaled in bearings in its opposite limbs, a rotor and generating coil between the limbs, an interrupter outside of one limb carried on said limb and connected to the power shaft, and a distributer outside the other limb carried on said limb and connected to the power shaft, together and a gear wheel Ournaled on said with side plates covering the space between the magnet limbs and inclosing therein the rotor and generating coil a housing for the interrupter mechanism, and an inclosure for the working parts of the distributer, whereby the entire magneto is tightly inclosed and protected, but eachof the parts is separately and easily accessible for'inspection or repairs without disturbing any of the In testimony whereof I hereunto aiiiX my signature in the presence of two-witnesses.

CHARLES THOMAS MASON.

Witnesses F. C. MANNING,

H. R. VAN DEVENTER.

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