US1191856A - Interrupter for ignition-dynamos. - Google Patents

Description

H-. R. VAN DEVENTER. INT'RRUPTERIOR IGNITION DYNAMOS.

' 'APPucMloN FILED 001.20. 1914. 1,191,856.,y

11116111111 July 18,. 1916.

Ef E.

Mnden MKM/f States,

vof'Sumter and State ot South Carolina, have movable member carrying a second UNITED sTATEs PATENT oEEieE.

HARRY RANDOLPH VAN DEVENTER, F

SUMTER, lSOUIH CAROLINA, ASSIGNOR, BY MESNE ASSIGNMENTS, T0 SPLITDORF ELECTRICAL COIJIPANY, OF JERSEY, A CORPORATION OF NEW JERSEY.

NEWARK, NEW

INTERRPTER' FOR IGNITION-DYNAMOS.

Specification of Letters Patent.

Patented July 18, 1916.

Application led October 20, 1914. Serial No. 867,563.

, To all whom it may concern:

`Be it known that I, HARRY RANDOLPH VAN DEVENTER, a citizen oi the United residing at Sumter, in the county invented certain new and useful Improvc ments in Interrupters for Ignition-Dynamos, of which the 'following is a specification, reference being had to the accompany ing drawing.

My invention relates to interrupters for magnetos and has Ytor its object the production of an interrupter that will be simple and cheap to manufacture and in which no platinum contacts are necessary.

Another object is to provide an interrupter in which the Contact surfaces are kept clean and bright by `rictional rubbing.

A. further object is to provide an interrup ter that is quick acting.

Interrupters as employed on ignition generators, or as they are commonly termed magnetos,7 usually consist of a. fixed contact member having a platinum tip, and a contact point, the `movable member by suitable means being caused to make and break contact with the fixed men ber at a certain place or places in each revolution of the magneto shaft by which the movable element is operatel. Such devices are open to several objections, the principal one being that owing to the cost of platinum, the contact points are made relatively small, and a slight amount of oil or dirt prevents them troni making a good Contact, thereby affecting the operation of the magneto.

` Another objection is thcsparking which takes place owing to the small. area of the contacts, and a further objection is the diiiiculty in maintaining even contact surfaces on the points and the Jfact that care'tul and often difficult adjustment is necessary if the points are removed for cleaning', etc.

In the accompanying drawing, Figure 'l is a iront view i an interruptor embodying my invention. 2, a side view partly7 in section oli same showing the circuit connections thereto, the interruptor contacts being closed, and Fig. 3, a view partly in sec tion showing the interruptor contacts open.

Like figures of reference denote the same parts wherever they are shown.

1 denotes the end plate of the interruptor vsuddenly lifted therefrom.

which is usually mounted on the end of the magneto. This plate carries a collector' ring i2, which is insulated from the plate by suitable insulation 3. The shaft of the magneto .is shown at l and upon this shaft is suitably mounted an arm 5 carrying a spring arm 5 to which is attached at its outer end, a brush The arm 5 may be readily removed, or adjusted in any radial position in relation to the shaft by any suitable means, such as screw '7. A cam 8 is mounted on the end plate arranged to engage a projection 9 carried by the arm 5 so that when '5 rotates over the cam the brush (3 which is normally in contact with the ring 2, will be This sudden lifting ot the brush is necessary, and Iconsider same to be one of the important features of my invention. Of course more than one cam S may be employed, so as to cause more than one interruption per revolution. It is essential in a magneto that the interrupter contact be suddenly broken. It will not sullice to have a cut-away portion or insert of insulation somewhere in the ring .as I have indicated at 10, for at slow speeds the breaking of the circuit would not be abrupt, but would be gradual as the end ot the brush would gradually slide from ring 2| on to the open space or Insulation 10. This would mean a gradual break instead of the abrupt break which is essential and which I obtain by my cam arrangement.

It will be observed that the brush 6 is atL all times in rubbing contact with the ring l except when lifted away by 9 passing over the cam 8. This keeps the contacts bright. Itv will also be observed that the ring 2 may be made of any suitable inexpensive metal such as brass, and the brush G may be of the ordinary woven wiretypc impregnated with graphite so as to be seltlubricating, and that the brush can be given a large area so that the resistance et the interruptor will be reduced to a. minimum.

In Fig. 9. the circuits of a magneto are shown, the primary 11 and lcondenser 12 being in multiple with the interruptor contacts. One end of the secondary 13 is connected to the ground or frame of the magneto, while the other end is connected to the usual spark plug indicated at 14, It will be understood that the windings 11 and. 413 are the generating windings of the magneto.

I have not shown any of the structural details of a magneto as it'is obvious that my improved form of breaker mechanism may be readily adapted for use in connection with any type of magneto in which interrupter mechanism is used.

I claim:

l. In an ignition dynamo,. interruptor mechanism comprising fixed and movable members in slidable contact, and means operated by said dynamo for separating said members whereby the entire surface of. said movable member is raised froml said fixed member.-

2. In an ignition dynamo, interruptor mechanism comprising fixed and movable members in slidable contact, and means operated bysaid dynamo lfor causing a break between said members whereby said movable member is lifted from sliding Contact with said fixed member.

3. In' an ignition, dynamo, interruptor mechanism'compr'ising fixed and movable members in slidable contact, and means operated by said dynamo .for causing a break between said members, said means comprising cam operated mechanism whereby the movable member is lifted from sliding contact with the fixed member.

4.-. In an ignition dynamo, interruptor mechanism comprising members in sliding contact, and rotary means operated by said dynamo for suddenly breaking said contact by lifting one of said members from the other.

5. In an ignition dynamo, interrupter mechanism comprising. a relatively fixed member, a second member rotating in sliding contact with said iixed member, and means operated by said dynamo for separating said members Without stopping the rotation of Copies of this patent may be obtained for ve cents each, by addressing the said second member, substantially as described.

6. In an ignition dynamo, interrupter mechanism comprising a contact ring, a shaft, an arm on said shaft, a brush on said arm in sliding Contact with said ring, and rotary means operated by said dynamo' for suddenly raising said brush from said ring.

7. Interrupter mechanism comprising a contact ring, a revoluble shaft, a brush carried by said shaft in sliding Contact with said ring, means` whereby said brush is raised from said ring for a portion of each revolution of said shaft, and means for radially adjusting said brush in relation to said shaft.

In an interruptor for ignition dynamos, the combination of a movable member having a radial path contact carried by said movable member and in contact with said lfixed member for completing a circuit, and means for suddenly moving saidcontact at right angles to its radial path of travel, and out of contact with said fixed member, substantially as described.

9. In an interrupter for ignitionv dynamos, the combination of'a' supporting plate, a collector ring carried thereby but insulated therefrom, a rotating contact member in contact with said ring, and means for suddenly separating said "rotating contact from said ring whereby the entire surface of said rotating contact Lleaves said ring at the same time, during a portion of each revolution of the dynamo, substantially as described.

In testimony whereof I hereunto aiiix my signaturemthe presence of two witnesses.

@HARRY RANDOLPH VAN DEYENTER. itnesses:

EDNA ISLER, E. H. RHAME.

"Commissioner of Intenta,

Washington, D. C.

of travel, a lixed contact, a

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