US1416670A - Oscillating magneto - Google Patents

Description

F. W. ANDREW.

OSCILLATING MAGNETO. APPLICATION men SEPT. 18. 1919. RENEWED APR- 30.1920.

1,416,670. atent d May23',1922.

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F. W. ANDREW.

OSCILLATING MAGNETO. APPLICATION FILED SEPT-18.1919. RENEWED APR. 30. 1920.

1,416,670. Patented May 23, 1922.

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F. W. ANDREW.

OSGiLLATING MAGNETO.

APPLICATION FILED SEPT- I8. 1919. RENEWED APR.30,192 O.-

1,416,670. a Patented May 23,1922.

3 SHEETS-SHEET 3.

Frederic/t l l/ awe/W600 UNITED STATES PATENT OFFICE.

rnnnnmox w. ANDREW, or BROOKLYN, new YORK, ssrenoa TO EisEMANN MAGNETO conrona'rron, on BROOKLYN, NEW YORK, A oonronarron OFNEW YORK.

Specification of Letters Patent. Patented May 23, 19.22.

Application filed September 18, 1919, Serial No. 324,543; Renewed April 30, 1920. Serial No. 377,970.

To aZZ whom it may concern.

Be it known that I, F nnonnron WILLIAM ANDREW, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Oscillating Magnetos, of which the following is afull, clear, and exact specification.

My invention relates to electric current generators, more particularly to those used in electric ignition systems employed in connection with internal combustion engines, and consists in devising a novel mechanism for oscillating the movable part of a genorator, an example whereof is herein described with reference to the accompanying drawings, wherein Fig. 1 is a front elevation of a magneto, provided with the mechanism for oscillating its shaft, constructed according tomy invention;

Fig. 2 is a similar View with the oscillator arm, and the nut-cap, removed;

Fig. 3 is a longitudinal sectional view on line 3-3, indicated in Fig. 1, looking in the direction indicated by the arrow pointing to the section line; i

Fig. i is a cross-sectional view on line it-"ti, indicated in Fig. 3, looking in the direction indicated by the arrow pointing to the section line;

Figs. 5 to 9, illustrate details of construction, Fig. 5 being a side elevation, partly sectional view of one of the spring arms; Fig. (3 a rear elevation of the other spring arm; Fig. 7 a sectional view thereof on line 7-7, indicated in Fig. 6; Fig. 8 a front view, and Fig. 9 a side view of the osciilator arm.

The oscillator mechanism is constructed as follows:

The flanged bushing 11 is keyedor otherwise secured to the magneto shaft 12, the end whereof is screw-threaded correspondingly to the interior screw-thread of the flanged capnut 13. The. body or'the nut 13 is titted into the bushing 11. which is recessed as shown at 11 in Fig. 2, and the oscillator arm 1% (see Figs. 8 and 9) is litted thereon; the central part of the slot 15 being widened i'forrespondingly to the interior annular recess 16 of the bushing 11 to permit passing therethrough of the body of "the sleeve 18, into which the inner end of the'spring 21 is inserted. At the end of the arm 17 the flange 2G is formed, which though helpful in the operation of the device, i not essential. When the arm 17 is mounted on the bushing 11, the end of the sleevelS abuts against the flange 23 of the said bushing, andthe said arm is thus rotatable, but not longitudinally movable thereon. The spring 21 is what is technically termed a helical spring, or more commonly called a spring of the clock-spring type.

More broadly speaking, I may refer to the spring 21' as one in which the arms of the coils is substantially coincident with the magneto shaft 12 on which the spring is mounted. A spring of thistype does not require any housing and is practically free from friction during the operation oi. the oscillator.

The shape of the other spring-arm 24:, is hown in Figs. 2 and 6. The perforation 25 in this arm is also snugly fitted upon the bushing 11', and a stud 26 is set in its end for connecting thereto the other outer end of the spring 21. The flange 27 on theend of this arm 24 extends in opposite direction to the flange 20 on the end of the arm 17, whereby both flanges are brought in alignment.

A plate 29 is secured by the nuts 32 to the posts 28, set in the casing 30 of the magneto. On this plate 29 a tongue 31 is formed, extending into the path of the spring arms 17 and 24!. and forming a stop arresting the movement of each of the arms when actuated by reaction of the spring 21, as explained further on in the description of the operation of this device.

The oscillator arm 141 is fitted upon the recessed forward end of the bushing 11, (see Fig. 2) and is secured thereon, and to the magneto shaft 12, by the flanged capnut The oscillator arm 14- is thus rigidly connected with the shaft 1.2 of the magneto like a crank, so that by swinging it the magneto shaft, and the rotor mounted thereon, are correspondingly actuated. Thereby also, as shown in Fig. 3, the spring-arms l7 and 24:, which are rotatably mounted on the bushing 11, are held in their position. The stud 33 is set in the oscillator arm in position to enter into the space between the spring-arms l7 and 24 (see Fig. 2) held open by the stop 31 separating them. This stud 33 is thus in position to engage either one oi? the arms 17 and 2%, according to in which direction the oscillator arm is swung. Each one oi? the two spring-arms 17 and 2% being connected to one end of the spring 21., and each being prevented by the stop 31 from moving when the other is swung away from the stop, the spring 21. is tensioned by moving the oscillator arm 14- in either direction, and reacts when the force, moving the oscillator arm,

ceases to act. By the reaction oi the spring, the springarm, which was thus swung away from the sto 11, acting upon the stud 33, imparts to the s illator arm 1%, a short but quick impulse in reverse direction. The spring-arm, thus acting on the oscillator arm is stopped by coming in contact with the fixed stop 31, whereas the stud 33 abuts against the other arm, which then acts as a cushion and stop "for the oscillator arm. Theoscillator arm let being rigidly connected with the magneto shaft 1.12, the latter, and the rotor, or other rotatory part of the magneto, are by the reaction oi the spring 21 rapidly swung through an arc, whereby electric current required for the production of the ignition spark, generated.

The movement of the oscillator arm lid to elfect the tensioning ot the spring 2] may be, and preferably is, produced by a cam, or a two or tour-pointed star-wheel, mounted on the engine shaft, or upon an intermediate shaft, driven from the engine shaft, in the required position to engage the oscillator arm. The particulars oi? the construction of these details are determined by the design of the engine, number of cylinders, etc. and as they form no part of my invention, they are not shown in the drawings and not described in detail.

My improved oscillating mechanism may be used on magnetos or other electric current generators, designed to be driven in either direction, the actuating spring being torn sioned, and reacting equally, whether the arm 17, connected to its inner, or the arm 24, connected to its outer end, is acted upon. Another advantage resulting from my invention is in that the other spring-arm, the one not acted upon by the oscillator arm l i, acts as a cushion in stopping the swing of the oscillator arm almost instantly and with a minimum of vibration, in the position, in which it to he engaged by the next point of rotating star-wheel. This positively prevents a miss oi? the oscillator arm 1i by the cam, StzHf-illlGQl, or other device actuating it, so ii'requently happening in ignition apparatus provided with oscillating mechanism of other coi'istruction, and also the jamming Oil the driving part, cam, star-wheel, etc, with the oscillator arm a"ten occurring when no positive step is provided, and also avoids jarring oi. the parts against a noncushioued stop oi the oscillator arm.

in Further ad antagc oi my new oscillator resides in the use oi a spring which does not require to be coniined in a casing. This not only simplifies the construction (and thus reduces the cost oi manufacture), but also materially increases the lite oi? the oscillator. It is a well-known :Et'act that the main trouble with oscillators oi prior construction is spring breakage. That is particularly true of oscillators using a coiled spiral spring, which must be bent into circular shape and confined in a housing. AS the spring contracts and expands, the coils rub against the walls oil? the housing and are soon worn to a point oi breakage. in my invention, this serious difficulty and objection are entirely eliminated.

1 claim as my invention:

1. An oscillating mechanism tor a magneto or other electric current generator, the mechanism com n'ising a coiled spring and two arms rotatably mounted on the magi'ieto shaiit, each of said arms being connected to one end of said spring, an arm rigidly secured to the magneto shalt, means on said last-mentioned arm for moving either o'l. oi said two arms, and a fixed stop in the path oi said two arms ior limiting the movement oi each in one direction. 7

An oscillating mechanism for a magneto or other electric current gencratcn'. the mechanism comprising a sleeve rotatablv mounted on the magneto slurtt, an arm int-egral with said sleeve. a coiled spring having its inner end connected to said sleeve. a sec: ond arm also rotatably mounted on the magneto shait and connected to the other end of said spring, a iixed stop for limiting the movement or? each oi said two arms in one direction, an arm rigidly secured to the magneto shaft, and means on said last-mew tioned arm for engaging either of the arms connected to the ends oi. said spring.

3. An oscillating mechanism 'tor a magneto or other electric current generator, the mechanism comprising a coiled spring, two arms rotatably mounted on the magneto shaft, each of said arms being connected to one end oi said spring, a fixed stop for lim iting the movement of each arm in one direction, an arm rigidly secured to the magneto shaft and adapted to be intermittently actuated, and means on said last-mentioned arm adapted to engage either of the two arms connected to the ends of said spring.

t. An oscillating mechanism for a magneto or other electric current generator, the mechanism comprising a pair ofmembers rotatably mounted 011 the magneto shaft, spring means connected to said members and adapted normally to urge them toward each other, means for limiting the movement of said members under the action of said spring means, and an intermittently operable arm fixed on the magneto shaft for engaging either of said members and actuating the same against the tension of said spring means, whereby the actuated member will under the action of said spring means impart an accelerated return movement to said arm.

5. An oscillating mechanism for a magneto or other electric current generator, the mechanism comprising a pair of oscillating members mounted on the magneto shaft, a coiled spring also mounted on the magneto shaft and connected at its ends to said members, said spring being so constructed and arranged that the axis of the coils is substantially coincident with the axis of said shaft, an arm operatively connected with the magneto shaft and adapted to move either member from its normal position against the tension of said spring, whereby the actuated member will impart an accelerated return movement to said arm under the action of the tensioned spring, and means for holding either member against movement during the operation of the other member.

6. An oscillating mechanism for a magneto or other electric current generator, the mechanism comprising an intermittently operable arm rigidly secured to the magneto shaft, a pair of rotatable members having hub portions for mounting said members on the magneto shaft, said members being arranged to engage said arm on opposite si es thereof, a helical spring for rocking said members independently of each other in opposite directions, whereby the operation of said arm in either direction moves one of said members against the tension of said helical spring, so that the release of said arm permits the spring-pressed member to movethe arm quickly back to normal position, and means for holding either member against movement during the operation of the other member.

7. An oscillating mechanism for a magneto or other electric current generator, the mechanlsm comprisinga helical spring and two independently rotatable arms, means on said arms for mounting them on the magneto shaft, each of said arms being connected to one end of said spring, means for actuating either arm against the action of said helical spring, and means for holding either armagainst movement during the operation of the other arm.

8. An oscillating mechanism for a magneto or other electric current generator, the mechanism comprising a helical spring and two independently rotatable arms mounted on the magneto shaft, each of said arms being connected to one end of said spring, means for actuating either arm against the action of said. helical spring, each of said arms being arranged to act as a yieldable stop for said actuating means and the returning arm, and means for holding either arm against movement during the operation of the other arm.

9. An oscillating mechanism for a magneto or other electric current generator, the mechanism comprising a coiled spring mounted on the magneto shaft, said spring being so constructed and arranged that the axis of the coils is substantially coincident with the axis of said shaft, an intermittently operable arm rigidly connected to the magneto shaft and yieldably held in normal position by said spring, and means whereby the actuation of said arm in either direction from normal position places said spring under tension, so that the release of said arm causes said spring to return the arm to normal position.

10. An oscillating mechanism for a magneto or other electric current generator, the mechanism comprising a pair of rotatable members having hub portions for mounting said members on the magneto shaft, a coiled spring also mounted on the magneto shaft, said spring being so constructed and arranged that the axis of the coils is substantially coincident with the axis of said shaft, means on each of said members for engaging one end of said spring, an arm for actuatin said members, and stop means for holding either end of said spring stationary during the operation of said arm in either direction to place said spring under tension.

FREDERICK W. ANDREWV.

Vitnesses i CHARLES S. SKINNER, LOUISE KELLER.

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