US1734350A - Magneto - Google Patents

Description

NOV. 5, SCHREIL MAGNETO Filed Nov. 1926 v INVENTOR EM BY ATTORNEYS.

Patented Nov. 5, 1929 UNITED STATES PATENT OFFICE AUGUST SCHREIL, OF I EILWAUKEE, WISCONSIN, ASSIGNOR, BY MESNE ASSIGNMENTS, TO OUTBOARD MOTORS CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN MAGNETO Application filed Nov-ember 8, 1926. Serial No. 146,960.

This invention relates to improvements in magnetos.

Itis the object of the invention to provlde a novel and improved magneto including sep arate coils for ignition and lighting. 7

The invention is peculiarly applicable to fly wheel magnetos such as are used on outboard motors. These magnetos include a well known form of armature which has heretofore had upon it a single coil for ignition purposes. I have found that by means of this invention it is possible to obtain en ergy from the magneto for the transmission of current through a lighting circuit without in any way impairing the operation of the ignition circuit. As will be more specifical- 1y shown hereinafter, this is done by the use of additional coils so disposed as to utilize the magnetic flux which has heretofore been wasted.

It is my purpose to accomplish these results without requiring any radical reorganization of the magneto structure, while utilizing to a considerable degree the standardized and well known parts thereof.

In the drawings:

Figure 1 is a plan view of the armature support of a fly wheel magneto embodying this invention and assembled with the fly wheel, portions of the fly wheel being broken away to expose the mechanism assembled on the support.

Figure 2 is a wiring diagram showing the electrical connections employed in accordance with this invention.

Like parts are identified by the same reference characters throughout the several views.

The magneto selected as an illustrative embodiment of this invention is of the general type described in Patent No. 1,147,038, issued to H. G. Mueller, on July 20, 1915.

,A permanent magnet 12 having pole pieces 13 is mounted interiorly of the rim of fly wheel 14, the fly wheel being fixed in the usual way to a shaft 15. The pole pieces rotate adjacent an armature mounted on a plate 16 which is loosely clamped at 17 to a sleeve 18 within which the shaft rotates. The armature includes head members 20, offsets 21 and an intermediate portion which extends through the coil 22 of an ignition circuit.

This coil includes a primary winding 23 having one end 24 which is grounded through means hereinafter to be described, and having the other end 25 connected by a wire 26 with the stationary contact 27 of the usual interrupter. A fixed condenser 31 is shunted across the breaker points or contacts 27 and- 28. The'last mentioned contact is grounded and provided with a cam follower portion 29 acted on by cam 30 on shaft 15.

The impulses generated by the making and breaking of a connection at the interrupter generate a corresponding current in the secondary winding 32 which includes oppositely wound portions intended to supply ignition current to spark plugs represented at 11.

The arrangement-above described for supplying current from a fly wheel magneto to the spark plugs of a two cylinder engine is all standard and has been set forth briefly in order to provide a basis for the following description of the more important aspects of the present invention.

It is my discovery that without in any way interfering with the successful use of the magneto for ignition purposes, I am also able to develop sufiicient current to supply a lighting circuit. This is done by applying a separate winding or windings at to the armature and I have found that I can take therefrom a suflicient quantity of current for the operation of a light without requiring any modification whatever ofthe ignition circuit and without decreasing in any degree the amount of current available for an ignition circuit.

In order to render more readily available the flux which has heretofore been wasted in the armature I have found it desirable to wind coils at 50 on the armature offsets 21. Each of the coils 50 is grounded at' 51, the grounding being at opposite ends of the coils whereby in effect the coils are connected together in series. Conductors 53 and 54 from the ungrounded ends of the coils are adapted to supply current to a lighting circuit including an incandescent electric lamp suitably located.

It will be apparent from the foregoing dehaving a mounted spring contact 38 and a fixed contact 41 to which the conductor 40 is connected. The second spring contact 42 of the jack is also connected with conductor 40, the arrangement being such that a battery may be plugged in in series with the primary winding 23. When the plug is inserted in jack 37, spring 38 is lifted from contact 41 and grounds contact 44, thereby introducing additional capacitance 43 in shunt with the breaker points to accommodate the battery current.

A" second jack 67 is connected with the lighting circuit leads 53 and 54 which deliver current respectively to the fixed contacts 71 and 68. These contacts are normally engaged by the jack springs 72 and 69, the ar: rangement being such that when a battery is plugged into jack 67 the flow of current from windings 50 to the springs will be interrupted and the battery current will be substituted through springs 72 and 69 to socket 60 for an ordinary incandescent lamp 61.

The above described arrangement is peculiarly adapted for lighting s stems on outboard motors and it illustrates t e manner in which an ordinary magneto is made Without any great modification to supply independent current for a lighting circuit in addition to the magneto circuit. The independence of the two circuits enables a ooster battery to baplugged into either circuit without unduly increasing the voltage or flow in the other. In the lighting circuit the arrangement is such that the battery is purposely substituted for the magneto current source so that the lamp filament will not be subjected to the combined current of both sources. For the same reason it is desirable to avoid taking the lighting current from the same part of the magneto which supplies the ignition circuit since in that event any boosting of voltage in the ignition circuit would likewise boost the voltage in the lightin circuit with the possible result that the lamp filament would be burned out.

While other locations of the auxiliary and armature heads 20 as indicated they will op erate more effectively to utilize waste fluxin the armature without interfering with the normal operation of the ignition coil.

I claim:

1. A fly wheel magneto comprising the combination of a rotatable fly wheel and a magneto mounted therein, of an armature extending transversely of said fly wheel and includin head members, ofl'set portions connected t erewith, an intermediate portion connecting said oflset portions transversely of the fly wheel and at one side of the center v thereof, an interrupter disposed adjacent the at each end adjacent a terminal head an offset portion, an ignition coil upon the intermediate portion between the oifset portions thereof, and a supplemental coil upon each of the offset portions, said supplemental coils having the axes of their respective fields dis posed substantially parallel to the axis of the ignition coil field but ofiset therefrom. AUGUST SCHREIL.

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