P. HAMMI MAGNETO.
APPLICATION FILED JUNEIZ, 1915.
1,224,535. Patented May1,1917.
//\/\/E/\/ TOR Pia-A M ATTURNE YFv' PETER HAMM, F MILWAUKEE, WISCONSIN.
Application filed June 12, 1915.
To all whom it may concern."
Be it known that I, PETER HAMM, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Magnetos, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.
The invention relates to magnetos, and more particularly to that type in which the magnet also forms a part of the fly-wheel of the engine.
' In detachable row-boat motors, and also in other motors for'propelling vehicles of various kinds, it is very desirable to provide an ignition system which is positive in its action, and in which the weight and size are reduced to a minimum.
The invention further designs to provide a magneto of the type described in which the armature core is ti-shaped so as to dispose opposite sides of the core on either side of the center of the armature plate and so as to connect the coils on both parts of the core to practically form one continuous coil extending across the armature plate thereby increasing the efficiency of the device over those in which the cores are disposed on opposite sides of the fly-wheel shaft and connected thereacross.
The invention further designs to provide a magneto of the type described provided with means for automatically interrupting the primary circuit comprising a switch on the armature and an adjustable cam plate on the field member which switch may also be manually operated to short circuit the primary circuit and control the stopping of the magneto.
The invention consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.
In the drawings, Figure l is a bottom View of the magneto embodying the features of the invention, the crank shaft of the engine on which it is mounted being shown in section;
Fig. 2 is a section taken on the line 22 of Fig. 1, showing the end of the engine shaft;
Fig. 3 is a section taken on line 3-3 of Fig. 2;
Fig. 4 is a detail sectional view taken on the line 4- of Fig. 2.
Specification of Letters Patent.
Patented May 1, 1917.
Serial no. saeez.
Referring to the drawing, the numeral 5 indicates an engine bearing, 6 the crank shaft and 7 the improved magneto mounted thereon.
The magneto comprises a revoluble field and a fixed armature, means for automatically breaking the circuit through the field and armature, and means for manually breaking the circuit through the field and armature.
The revoluble field comprises a flanged revoluble fiy-wheel 8 keyed to the crank shaft 6 and which carries a pair of permanent magnets 9 whose portions 10 are curved to conform to the inner periphery of the flange of the wheel and whose ends 11 and 12 are curved inwardly to form pole piece supporting ends 13 and 14. Concentric pole shoes 15 are secured to the ends 13 and 14 by screws 16 which also secure the magnets to the flange and additional screws 17 secure the portions 10 to the flange of the wheel. The ends 18 of the pole shoes are pointed, as shown in Fig. 2, to positively fix the points of make and break. The magnets 9 are diametrically disposed with respect to each other as are also the pole pieces 15 so as to give good balance to the wheel.
The fixed armature comprises a fixed armature plate 19 upon which the stationary armature is mounted. The plate 19 is provided with a split hub portion 20 which extends around the reduced end of the hearing 5 and is adjustably clamped thereto by the bolt 21 which draws the split portions of the hub together. The said plate is also provided with a radially projecting handle 22, connected by means of a flexible plate 23 to the plate 19 for convenience in turning the plate to advance or retard the time of sparking. The connection of the handle is made flexible so as to permit vertical movement of the handle with respect to the plate should it be carelessly pressed down or leaned upon, thus preventing any liability of displacement to the plate 19.
ihe stationary armature consists of a V- shaped core 2 disposed with respect to the shaft 6, as shown in Fig. 3, which is secured at its ends 25 within oppositely disposed recesses 26 in plates 27 forming the heads or pole pieces by screws 28. Pins 29 also pass through the plates 27 to hold them together. Both parts of the J-shaped core are provided with primary and secondary coils of wire 30 and 3]. respectively, wound therearound and connected together. By means ofl this V-shaped core the efficiency of the coils is greatly increased as they may be closely connected together and there will be greater flux produced thereby as the two coils by this construction will practically form one continuous coil. One end 32 of the primary wire 30 is inserted through an insulated opening 33 in the plate 19 and then extends outwardly and is connected to a binding post 34 mounted in a block of insulation 34' secured to the plate by screws 35. A branch wire 36 connected to the end 32 leads to a condenser 37 The other end 38 of the primarycoil 30 is grounded to the plate 19 at 39 and also connects through the branch 40 with the other terminal of the condenser 38. The secondary coil 31 of the armature begins at its point of connection 41 with the primary circuit wire 30, and from this point extends around the core and passes out through an insulated opening 42 and a high tension wire 43, connected thereto, extends to the spark plug 44, as indicated in Figs. 1 and 3.
The meansfor automatically breaking the circuit through the primary consists of a switch and means for automatically operating the same. The switch consists of a flexible contact member 45 pivotally mounted on a pin 46 secured to the plate 19 and carrying a contact point 47, a fixed contact point 48 secured to the end of the binding post 34. The contact 47 is normally held out of contact with the contact 48 by a spring 49 mounted on a lug 50 on the plate 19 and bearing against the member 45. The means for automatically operating the switch comprises a cam surface 51 integral with a cam plate 52 which is adjustably mounted on insulated blocks 53 on the fly-wheel by a bolt and slot connection 54, whereby the cam plate may be set so that the switch-contacts separate on the moment the armature shoes break away ,from the pole pieces. The contact member 45 being mounted adjacent the handle, the operator by pressing the contacts together may short circuit and control the stopping of the magneto.
A strong magnetic field is formed between the pole shoes of the permanent magnets so that as they are revolved around the stationary armature a current is produced in the armature primary winding which reaches its maximum power twice in each revolution, that is, when the pointed ends of the pole pieces revolve past the rear ends of the amature pole pieces, therefore permitting two sparks to be produced if desired.
In the drawing, however, only one of the maximum periods is utilized as only one cam is provided which is so positidned with relation to the maximum current as to break the primary circuit by engaging the contact breaker once at each revolution at the time of one of the two maximum current periods and thus by induction in the secondary coil produce a spark at the plug 44. It is obvious that, with the addition of another cam, a spark may be introduced at each half revolution and when connected up to a distributer (not shown) of ordinary construction the magneto would be adapted to be used with a multiple cylinder engine without departing from the spirit and scope of the invention. As the contact breaker is grounded on the plate 19 through the contact member 45 and the casing is mounted on the engine shaft, these parts including the spark plug form the return circuit connection for the high tension circuit.
The pole shoes of the permanent magnets are so spaced with relation to the armature pole pieces as to just clear the same in revolving therearound.
By turning the fixed armature plate by means of the handle, the spark may be ad vanoed or retarded with relation to themgine upon which it is mounted.
The invention thus exemplifies a magneto of the fly-wheel type of simple and efficient construction and one in which the means for automatically making and breaking the current through the primary may be manually controlled to stop the operation of the ma gneto.
What I claim as my invention is:-
1. In a magneto, the combination of a non-rotatable armature member comprising a plate and a V-shaped armature core of greater length than the plate secured to said plate about its center and carrying primary and secondary coils extending on both sides of the V-shaped core to form substantially continuous coils of greater length than the-- plate, a field member including permanent magnets revoluble therearound, and means for interrupting the current in the primary.
2. In a magneto, the combination of a non-rotatable armature member provided with *primary and secondary coils, a field member including permanent magnets revolubly mounted therearound, and means for automatically interrupting the current in the primary comprising a switch carried by the armature member, and a cam plate adjustably mounted on the under side of the field member adjacent the magnets for operating the switch.
3. In a magneto, the combination of a non-rotatable armature comprising a plate, and a core provided with primary and secondary coils mounted thereon, permanent magnets revoluble therearound, a circuit interrupter in the primary circuit comprising a fixed and movable contact carried by the plate and a cam carried by the magnets for automatically controlling the operation of the movable contact, said movable contact being also under the control of the operator whereby the primary circuit may be con-. tinuously interrupted.
4. In a magneto, the combination of a non-rotatable armature comprising an adjustable plate, and a core provided With primary and secondary coils mounted thereon, a fly-Wheel member including permanent magnets revolubly mounted around the armature, a circuit interrupter in the primary circuit comprising a fixed contact and a flexible contact carried by the plate and a cam plate carried by the magnets for automatically controlling the operation of the flexible contact, said flexible contact being also manually operable whereby the primary circuit may be-continuously interrupted, and a handle carried by the plate for moving the same to advance or retard the spark. a
5. In a. magneto the combination of a non-rotatable armature comprising an adjustable plate and a core provided With primary and secondary coils mounted thereon, a fiy-Wheel member including permanent magnets revolubly mounted around the armature, a circuit interrupter in the primary circuit comprising a fixed contact and a movable contact carried by the plate, said movable contact extending beyond the flywheel for manual control, and means on the fly-wheel for automatically controlling the operation of the movable contact.
6. In a magneto, the combination of a revoluble fly-Wheel member provided with permanent magnets having diametrically disposed arc-shaped pole shoes equi-distant from the axis of said Wheel member, a nonrotatable armature member comprising a plate and a V-shaped armature core of greater length than the diameter between said pole shoes and secured to the plate about the axis of the Wheel member, diametrically disposed pole pieces carried at the ends of said V-shaped core, primary and secondary coils mounted on both sides of said V-shaped core to form a substantially continuous coil of greater length than the distance between the pole pieces, and means for interrupting the current in theprimary.
In testimony whereof, I afiix my signature.