US1578548A - Magneto - Google Patents

Description

March 30,1926; 1,578,548

' A. ROSNER MAGNETO Filed Dec. '7, 1921 INVENTOR' I ADOLPH ROSNER.

ATTORNEY Fatented Mar. '0, 192%.

UNITED STATES ADOLPH KOSHER, SPRINGFIELD, MASSACHUSETTS, ASSLGNUB! TO AMERICAN Boson: MAGNETO conronarron, or PORATION on NEW YORK.

SPRINGFIELD, LlEASSACI-TUSET'IS A COR- MAGNETO.

Application filed December To all whom it may cone-em."

Be it known that I, ADoLrH RosNnn, a citizen of the United States, residing at 4 Ventura Street, Springfield, in the county of Hampden, State of Massachusetts, have invented certain new and useful Improvements in Magnetos; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to magnetos of the rotary or oscillating type, and particularly to certain structural parts thereof, such as the interrupter mechanism and the cap therefor.

l-lerctofore it was customary to have a combined interrupter housing and bearing member, which was detachably fastened to the frame housing and positioned therein by a fit ring, and in magnetos arranged for fixed ignition, the cam or cams were some times fastened to that detachable member. In accordance with my invention, a onepiece frame provides integral housings for both the rotor and the interrupter, whereas a removable bearingjmember is fastened in position in the interrupter housing for supporting one end of the rotor, the cam or cams being carried by or being integral with the bearing member. The bearing carrying member is preferably angularly adjustable in the frame of the magneto for adjustment of the edge distance, as more specifically pointed out in co-pending application, Serial No. 520,700 filed concurrently herewith.

In the accompanying drawing illustrating my invention in application, as an example, to a single cylinder magneto of the rotary armature type arranged for one spark per re elation;

Fig. 1 is a view in side elevation of the magneto; Fig. 2 is a longitudinal section of the same; Figs. 3 and i are detail views of an end cap, retaining spring and an interrupter cam.

In this embodiment of the invention, the magneto comprises a U-shaped permanent magnet 1 supported upon a frame 2, preferably made of aluminum and of the general form of a cylinder or tube having a closed end portion 3 and an opened end portion l. iVithin the frame 2 is rotatably supported an armature 5 of usual construc- 7, 1921. Serial No. 520,701.

tion having a shaft of which portion 6 is supported in a ball bearing 7, seated in the closed end 3 of the frame 2, and shaft portion 8 is supported in a ball bearing 9 mounted in a bearing supporting ring 10 seated in the frame 2 against an internal annular shoulder 11. The armature also carries, near the shaft portion 6, a collector 12, and at its other end, near the shaft portion 8, a condenser 13. hen casting the frame 2, the pole shoes are cast with the frame.

At the top of the casing 2 are provided oil cups 1a and 15 adapted to supply a lubricant to the bearings 7 and 9, by means of conducting wicks 16 and 17, as is clearly shown in Fig. 2 of the drawing. The casing also carries, above the collector 12, a collector brush holder 18 formed of insulating material, such as bakelite, and having a metal insert electrode 19 recessed at its outer end to receive a terminal of a high tension lead and connected at its inner end by a spring 20 to a collector brush 21, the latter being rectangular in cross-section, so that its greatest dimension is in the plane of rotation of the collector spool, and its shortest dimension isaxially of the armature of the magneto. The brush 21 bears against a metal track 22 forming part of the spool 12. In order to form a water shed for the collector and preventing water from having access to the interior of the magneto,the collector brush holder is formed with a skirt portion 23, which overhangs an annular or upwardly extending portion 24 of the frame 2, as is clearly shown in Fig. 2 of the drawing. The frame also carries a grounding brush 25 extending inwardly into contact with the condenser casing which is electrically connected to oneside of the condenser.

The shaft portion 8 extends through the bearing 9 and carries an interrupter mechanism 26 which extends beyond the open end of the outside of the bearing 9 and ring 10. The interrupter is held in place by an end fastening screw 27 in a known manner, and is partly surrounded by a relatively stationary cam 28 which operates to deflect the interrupter lever, and hence separate the contact points, thus effecting a breaking of the circuit of the primary winding of the armature. In this construction the cam 28 is formed integral with the ring 10 and ex frame 2 and adjacent but tends outwardly from such ring around a portion of the interrupter mechanism. In the embodiment shown, the magneto is of the rotary armature type for use with a sin-' gle cylinder engine, although the invention is applicable to an oscillating type of magneto and also to a magneto connected to a multi-cylinder engine, in which case either a greater number of cams may be used or the speed of rotation of the magneto increased. The cam 28 is shown as arc-shaped with an inner cam surface 29 adapted to cooperate with the interrupter lever. This cam is intended for fixed ignition operation. At the base of the cam is provided an aperture in which is located an oil wick 30 adapted to supply the oil through apertures 31 to the face 29 of the cam. It will be noted that the outer end 4 forming the interrupter housing of the frame 2 is short, so that the interrupter mechanism and the cam 28 project beyond the open end 4 and greater accessibility to the interrupter, both axially and radially, can be obtained. In order to cover the interrupter mechanism and the cam, an interrupter cap 32 of dome shape is connected with its flanged portion 33 extending into the open end 4 of the frame 2 and bearing upon the outer face of the bearing holding ring 10, the cover cap 32 thus also holding the ring 10 in place against the shoulder 11. The cap 32 is held in position by a spring bail 34, shown in detail in Fig. 3, this bail having at its ends trunnions 35 resiliently fitting into recesses formed in the sides of the frame 2. This bail is so constructed that when once connected in place it need never be disconnected, but is swung about the axis of the trunnions 35 to be engaged with or disconnected from the cap 32, the bail being capable of springing for such'purpose. The cap 32 has at its central outer portion, a depression 36 into which the central portion 37 of the bail may snap when the latter is connected to the cap. The cap is preferably made of sheet metal and drawn to the shape shown; 7

When inserting the member 10 in place and connecting the interrupter to the shaft portion 8 by the end screw 27, the member 10, which carries the cam 28, may be adjusted angularly to a certain extent. This is permitted by providing the frame 2 with lateral openings 38, through which extend screws 39 into the member 10, the diameter of the apertures 38 being greater than the diameter of the shanks of the screws 39, so that a certain amount of angular play or movement is permitted for adjusting the relation of the cam wit-h respect to the interrupter mechanism, so that the contact points will be opened at the instant when the pole shoes of the magnet and the core extensions of the armature are separated a given distance, called the edge distance. Adjustment for the latter is made by turning the member 10 in the housing 2 to the point when the edge distance is of the amount desired, and also when the cam is holding the contact points open. The screws 39 then are drawn up tight, so as to hold the member 10 fast, and a hole 40 drilled into the lower part of the ring 10, after which a lock pin 41 is inserted in this hole through the lower portion 4 of the frame 2, so as to lock and maintain the ring 10 in adjusted relation.

Having thus described my invention what I claim is:

1. A magneto comprising a permanent magnet, a rotor cooperative with the magnet, an interrupter cooperative with the rotor, a frame, a bearing member fastened in the frame for supporting one end of the rotor, and means for angularly adjusting the bearing member in the frame, the cam element of the interrupter being "fastened rigidly to the bearing member, whereby adjustment of the bearing member adjusts the edge distance of the magneto.

2. A magneto comprising a permanent magnet, a rotor cooperative with the mag net, .an interrupter cooperative with the rotor, a frame, a bearing member fastened 9 in the frame for supporting one end of the rotor, means for angularly adjusting the bearing member in the frame, the cam element of the interrupter being fastened rigidly to the bearing member, whereby adjustment of the bearing member adjusts the edge distance of the magneto, and means for locking the bearing member in adjusted positlon.

In testimony ture.

whereof I aiiix my signa- ADOLPH ROSNER.

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