US1389034A - Ignition-generator - Google Patents

Description

W. W. DEAN.

lGNlTlON GENERATOR. APPLICATION FILED AuG.22, me.

. Patented Aug. 30, 1921 UNITED STATES PATENT. OFFICE.

WILLIAM wmmr DEAN, or STAMFORD, connnc'rrcu'r, ASSIGNOR TO srm'rnom nmc'rmom oomrm, or NEWARK, NEW JERSEY, A. conronm'ron' or NE JERSEY.

IGNITION-GENERATOR.

To all whom it may concern Be it known that I, WILLIAM W. DEAN, a citizen of the United States, residing at Stamford, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Ignition- Generators, of which the following is a specification, reference being had to the accompanying drawing.

The invention relates tors used for'ignition or the like and generally termed magnetos, and in detail to 'a magneto having a stationary current generating coil and a permanent magnet rotating between the pole pieces connected to the core of said coil.

An object of the invention is to provide a magneto of the above type with pole pieces which may be shifted relative to the fixed pole pieces connected to the core of the coil for timing purposes.

A further object of the invention is to provide a magneto of the above type with means for short circuiting the poles of the magnet which are not furnishing flux to the shiftable pole pieces.

. These and other objects will in part be obvious and will in part be hereinafter more fully disclosed. v

In the drawings which show by way of illustration, one embodiment of the invention:-

Figure 1 is a vertical sectional view through a magneto having my improvements; and

Fig. 2 is a sectional view on the line 2--2 of Fig. 1.

The invention, asshown in the drawings, is embodied in a magneto for ignition purposes which consists of a permanent magnet mounted on a suitable shaft adapted to rotate in suitable bearings This magnet forms the rotor of the magneto. Associated with the rotor is a stationary current generating coil. Extending through the generating coil is a core having pole pieces connected thereto, which pole piecesare .dis-

posed relative to the permanent magnet so" as to receive flux therefrom. This rotating magnet is provided with a plurality of alternately N and S poles and the pole pieces are so disposed as to receive flux from adjacent poles of the magnet. These features are broadly shown and described and broadly to genera- Specification of Letters Patent. I Patented Aug, 30, 1921 Application filed. August 22, 19 16. Serial N0. 116,359.

claimed in my co-pending application, Se-

which is so disposed as to short circuit the poles ofthe rotor""which are remote from the pole pieces. Referring more in detail to the drawmg I I have shown the invention embodied in a magneto having side plates 1 and 2 which are formed with-bearings 3 and 4 for a shaft 5 which is rotated by any suitable means. Clamped between the upper parts of the side plates 1 and 2 is a core 6 carrying a current generating coil 7 of the usual construction.

ttached to the core 6 are pole pieces 8 and 9 having curved faces 10 and 11 respectively. Mounted on the shaft 5 is a permanent magnet 12. This magnet is secured to the shaft by asuitable key 13. The magnet 12 is provided with four poles 14, 15,16 and 17, the outer faces of which are curved as at 18 about the axis of theshaft as a center. I

degrees apart and the pole pieces 10 and 11 are similarly disposed so that'they receive flux from adjacent poles of the magnet.

Freely mounted on shaft 5 are two nonmagnetic. plates 19 and 20. Between these plates and outside of the magnet there are sections 21, 22 and 23 of magnetic material and also sections 24:, 25 and 26 'of non-magnetic material. Suitable screws 27 pass through these side plates 19 and 20 into these sections and 'secure the same together, thus forming a sleeve, which is freely shiftable about the shaft 5 as a center. he section 26 is provided with a handle 28 which may be connected to the timing mechanism. The sections 21 and 22 of magnetic material are curved toconform to the faces of the 4 pole pieces and also to the outer faces of the poles of the magnet and are disposed betweenthese faces as clearly shown in Fig. 1

which receive the flux from the poles of the magnet as the flux passes to the fixed pole pieces 10 and 11 and the core of the current generating coil. This sleeve with the shiftable pole pieces is shifted in the well known that the presence of this magnetic section.

23 does not effect the magnetism in said pole pieces. This magnetic section for short circuiting certain of the poles of the magnet is shown, described and claimed broadly in m co-pending application Serial No. 113,117, filed August 4th, 1916.

It is obvious that minor changes in the details of'construction may be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is v 1. An ignition magneto comprising a stationary current generating coil, a core therefor, fixed pole pieces for said core, a rotating permanent magnet having a plurality of like poles, said pole pieces being so disposed relative to the magnet as to receive flux from adjacent poles of said magnet and shiftable pole pieces between the fixed poles and the poles of the magnet furnishing flux thereto,

and a magnetic section so disposed relative to the rotating magnet as to short circuit the other poles of said magnet.

2. An ignition magneto comprising a stationary current generatin coil, a core therefor, fixed pole pieces for said core, a rotating permanent magnet having a plurality of like poles, said pole pieces being so disposed relative to the magnet as to receive flux from adjacent poles of said magnet and shiftable pole pieces between the fixed poles and the poles of the magnet furnishing flux thereto, a magnetic section so disposed relative to the rotating magnet as to short circircuit the other poles of said magnet, said magnetic section being shiftable with the pole pieces.

r n ignition magneto comprising a stationary current generatlng coil, a core therefor, fixed pfole pieces for said core, a four pole permanent magnet having alternate N and S poles, said pole pieces being so disposed as to receive flux from the adjacent poles of the magnet and shiftable pole pieces disposed between the fixed poles and the poles of the magnet furnishing flux thereto, and a magnetic section so disposed relative to the magnet as to short circuit the poles which are remote from said shiftable pole pieces.

4. An ignition magneto comprising a stationary current generating coil, a core therefor, fixed pole pieces for said core, a four pole permanent magnet having alternate N and poles, said pole piecesbeing so disposed as to receive flux from the adjacent poles ofthe magnet and shiftable pole pieces disposed between the fixed poles and the poles of the magnet furnishing flux thereto, and a magnetic section so disposed relative to the magnet as to short circuit the poles which are remote from said shiftable pole pieces, said magnetic section being connected to and movable with said shiftable pole pieces.

5. An ignition magneto comprising a stationary current generating coil, a core therefor, fixed pole pieces forsaid core, a rotating permanent magnet having a plurality of like poles, said pole pieces being so disposed as to receive flux from adjacent poles of the magnet, a shaft carrying said magnet, nonmagnetic side plates freely journaled on said shaft, shiftable pole'pieces disposed between the fixed pole pieces and the poles of the magnet, means for connecting said shiftable pole pieces to saidside plates, a magnetic section connected with said side plates and so disposed as to short circuit the poles of the magnet remote from said shiftable pole pieces.

6. An ignition magneto comprising a stationary current generating coil, a core therefor, fixed pole pieces for said core, a rotating permanent magnet having a plurality of like poles, said pole pieces being so disposed as to receive flux from adjacent poles of the magnet, a shaft carrying said magnet, nonmagnetic side plates freely j ournaled on said shaft, shiftable pole pieces disposed between the fixed pole pieces and the poles of the magnet, means for connecting said shiftable pole pieces to said side plates, a magnetic section connected with said side plates and so disposed as to short circuit the poles of the magnet remote from said shiftable pole pieces, and non-magnetic sections carried by the side plates and separating said last named magnetic section from the shiftable pole pieces.

In testimony whereof I hereunto afiix my signature in the presence of two Witnesses.

VVILLIIAM WVARREN DEAN.

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