US1038592A - Magneto. - Google Patents

Description

O. E. JOHNSON.

MAGNETO.

APPLICATION FILED AUG. OO, XOOO Patented Sept. 17, 1912.

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APPLIGA'TION FILED AUG.30,1909.

Patented Sept. 1'?y i912.

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.application filed august 30, 1909.

' .To @ZZ iti/1.0m if; may concern .7de lrno .vn that l, CARL E. Ql'onison, a citizen of theljnited States, residing` Los r-f'tngelesa in the county of Los ngeles and State of California, have invented nenT and useful l/l'agneto, of which the following` a specilication.

l`his invention "relates to magnetos and particularly to that type of magneto which is einjiloyed in the ignition apparatus of internal combustion engines. ln such magnetos that circuit has heretofore been made and broken by a mechanically operated circuit breaker7 or interrupter, and the main object of the present invention is to malte and break the circuitl by magnetically operated means, the magnetism used for this purpose being produced by the magneto, the advantages arisinv 'therefrom being `greater simplicity of the machine on account of elimination of the more or less comples: circuit breakera elimination of movingv and wearing` parts7 and perfect action on account of direct application of force from the magneto. further advantage is that it is possible to Tary the time of prfulurina` the spariVr through a much `greater are than can be secured by adjusttinel the timers heretofore employed.

The invention may be employed in magy netos ivherein a transformer is employed externally of the magnet@ the armature haring' a prin'iary windingonly, or where the armature is provided with a primary wimlingand -a so-called secondary Winding,` without an external transformer., or is adapted to bc used in any of the Well-known types of magnetos.

in one form of vthe inreiition employ tivo auxiliary pole pieces in addition to the regular pole pieces.l for attracting an armature to separate contact points and brealt the circuit. ln another form l dispense with the auxiliary pole pieces and employ the lower ends of thelregular poles of the tlf-shaped magnet `for attracting the circuitv controllinq armature to separate the contact points; ihe contact points are movned together pr xferably by spring' means. ln the v present embodiment. the poles which attract the circuit controlling' armature are fixed and bear a constant angular position. By adjusting the regular pole pieces l am enabled to vary the point in the cycle at 'which the electric pressure Within the armature Specification of Letters Eatent.

nections wherein atented Sept.. 17, 1912, Serial No. 515,329.

Winding attains its maximum value so that excitation of the circuit controlling armature will correspond to the adjustment and rthe consequent attraction of the circuit controlling armature and break of the circuit Will occur accordingly.

quick break in the primary circuit is of importance and a further object is to so construct the device thatv a sudden break is produced in the primary circuiti. l

Referring to *the drawings: Figure l is a side elevation rof the magneto, partly in section. Fig. 2 is a front. elevation. 3 is a diagrammatic View showing` the method of Winding in which no external transformer is employed, there being a primary Winding and a so-called secondary Winding on the armature. Fig'. 4 is adi-l agranmiatic view showing the armature having a primary Winding` only, there being an external transformer. cross section. on line :UL-wi Fig'. Q. Fig. G is a diagrammatic view showing the conth-e arn'iature is Wound with both prin'iary and secondary coils7 both coils beingv separated from each other. Fig. 7 is a perspective view of one end of the magneto showing adjacent portions of the circuit controlling parts. Fig. S is a perspective vieu' of the'adjustable pole pieces.

in they form shown in l*1 ig'. l, l designates the regular magnet having poles 2 provided with main pole pieces 3 and adjustable portions or shoes at, the. latter fitting' revolubly in the main pole pieces 3 and being" connected. at cach end by a. ring from one of 'which an arm extends through a slot G to permit the arm 6 to be moved to adjust the shoes, Yillatcs T are secured to .the ends of the box 8 of non-magnetic material. Both plates T are of a non-mag netic material. 9 designates the armature shaft mounted at each end in bearings l in the plates and 7. rEhe armature shaft carries a rotatingV armature of the l-l- Atype. Auxiliary pole pieces l2 are arranged above and beloiv the armature ll and are supported by arms 13 which extend through slots formed in the box 8 and are secured to the end plate i by screws l5.

circuit controlling)` armature 16 is sup- Ved by springs l? and is adapted to be acted by the tivo arms 13 of the auxiliary poN pieces Fig. is ai 18 is astationary conti-actl point supported by a stationary bracket 19, and 20 is a mov-A able contact supportedby' a spring 21,'the

latter being at a distance from the armaturel 16 when the armature 16 is away from the arms 13 and the armature 16 ris normally held retracted by the springs 1'?.y rlhe contact points 18 and 20 are located in the primary circuit and normally keep the primary circuit closed, the spring 21 pressing the conf tact 20 against the contact 18. As the armature 11 rotates the auxiliary polevpieces 12` are excited twice in each revolution of the varifnature and each time they are excited vthe arms 13 thereof attract the circuit controlling armature 16 and the latter strikes the spring 21 with a hammerblow and suddenly moves the Contact 20 away trom the contact 18, thereby breakingthe primary circuit and the position shown in lig. 1, the armature 11 being about to leave one pole piece and enter another and the auxiliary pole pieces 12 being substantially midway between the regular pole pieces 3, so that the maximum magnetic excitation of the auxiliary pole pieces 12 and arms 13 will occur at the time of greatest electrical pressure. The springs 17 are set to resist closing of the circuitcontrolling armature 16, except when the greatest pull is exerted thereon. Adjustment ot the shoes 4 to vary the time of magnetic excitation of the auxiliary pole pieces 12 vand time of spark will not alter the intensity ot the spark. f

The armature 11 Amay be provided with a primary winding 22, as shown in Fig. 3, which is grounded, and a secondary windf ing 23 on the armature may be connected at one end to the primary winding and thus grounded and its other end connected with the spark plug 24. rllhe primary circuit 22 nea includes the sparking terminals 18 and 20, and a condenser 25 is preferably connected in parallel with the contacts 18 and 2O to preventsparking at these contacts.

lig. 4 shows the armature as provided. with the primary winding 22a only, there being an external transformer 26, the primary winding 2'? ofwhich is in circuit with the primary winding 22ZL and the secondary winding 28 connects at'one end to the pri mary winding 28 and is there grounded and thence is connected at its other end to the spark plug 211.

' 1n lFig. 6 the armature is shown as provided with a primary winding 29 and a secondary winding 30,' botlroi' vwhich 'windings are separated from each other.

18 and 2.0 are the contact points 'in each circuit` and4 25 is the condenser. YThe sec ondary circuit 30 includes the spark plug Aall of these methodsot winding and their circuits are welllrnown in the art and any ot them may bc employed in'carrying out my invention.

'llhe armature winding may be taken otl' at one end by a brush 31 asshown in Fig. 5, while 4the other yend may be conducted through the hollow shaft 9.

What ll claim is:

1. A magneto comprising a magnet, pole pieces on the magnet, adjustable shoeson the pole pieces, means tor adjusting the angular relation between the adjustable shoes and the pole pieces, an armature, a primary ing and means operated by the pole pieces tor breaking the primary circuit.

2. A. magneto comprising a magnet with pole pieces thereon, an armature extending beyond the magnet, auxiliary pole pieces at one side of the magnet coperating with the extended portion ot said armature, a primary and secondary circuit, `and means operated by said auxiliary pole pieces tor breaking the primary circuit.

lfn testimony whereof, ll have hereunto set 24 day otiugust, 1909. l canna. Jonsson.

v1n presence oit- G. 'll`. Hackney, FRANK A. GRAHAM.

winding on the armature, a secondary wind:

my hand at Los Angeles, Calit'ornia, this

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