US1388689A - Igniter trip mechanism - Google Patents

Description

ALB. BAKER.

IGNITER TRIP MECHANISM.

APPLICATION FILED AUG. 1 I, 1919. 1 3 9 Patented Aug. 23, 1921;

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IGNITER TRIP MECHANISM.

APPLICATION FILED AUG-H, 1919.

1,388,689. 4 I PdtentedAug.23,1921.

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UNITED STATES PATENT OFFICE.

ARTHUR H. BAKER, 0F INDIANAPOLIS, INDIANA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO CHARLES G. MCGUTCHEN, 0F INDIANAPOLIS, INDIANA.

IGNI'IER TRIP MECHANISM.

Specification of Letters Patent. Patented Aug. 23, 1921- Application filed August 11, 1919. Serial No. 316,735.

To all whom it may concern:

Be it known that I, ARTHUR R. BAKER,

a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented a new and useful Igniter Trip Mechanism, of which the following is a specification.

It is the object of my invention to improve and simplify the operating mechanism for oscillating ignition magnetos for internal combustion engines; to make all movements of the parts on one another turning movements about pivot pins, and to eliminate all sliding of the parts on one another except on such pivot pins, and thus to promote accuracy in the action of the device; to produce an accurate change in the predetermined tripping point, for running and starting conditions; and to minimize wear.

The accompanying drawings illustrate my invention: Figure 1 is an elevation of an oscillating magneto and part of the associated engine, with my improved igniter trip mechanism thereon, showing the parts in normal position; Fig. 2 is a bottom plan on an enlarged scale of such oscillating magneto and its trip mechanism, with some of the parts in section; F igs. 3, 4, and 5 are elevations of the trip mechanism, in the position in which it is about to trip, in tripped position, and in normal position respectively, and in Fig. 5 one of the side arms of the double-armed link is removed; and Fig. 6 is a horizontal section through the trip mechanism at the joint of the toggle, to show the interlocking of the two toggle'arms for setting purposes.

The internal combustion engine 10, of which only a fragment is shown, has its ignition spark supplied by a magneto 11, which is of the oscillating type having a movable member mounted on a shaft 12 and spring-pressed to a normal middle position by a pair of returning springs 13 acting between two fixed posts 14 and two pins 15 on a cross head 16 fixed on said shaft 12. The cross head 16 has a finger 17 which engages a finger 18 connected with the movable electrode 19 (Figs. 2, 3, and 4) to move such movable electrode away from the fixed electrode 20 when the cross head 16 The rod 27 operates also operate to exhaust valve mechanism, if

and the movable member of the magneto are moved in a counterclockwise direction (Fig. 4), from their normal position (Figs. 1 and 3). The finger 18 and the movable electrode 19 are spring-pressed in clockwise direction (Figs. 1, 3, and 4) by a suitable spring 21. The magneto and the electrodes are both conveniently mounted on a bracket 22, which is suitably fastened to the engine 10.

The engine 10, as shown, has the usual rotating cam 25, which cooperates with a roller 26 on the end of a reciprocable rod 27 to produce the desired movement of such rod. the magneto; and may desired, as indicated by the extension of said rod to the left in Fig. 1 past the magneto, though this forms no part of the present invention. A clamp 28 is mounted on the rod 27 in proper position, and is held in such po sition by clamping screws 29; the manner of setting this clamp 28 on the rod 27 will be explained later. The clamp 28 is provided with a laterally opening socket 30, in which is mounted a shaft 31 from the end of which eccentrically projects a pin 32 provided with a pair of operating wings 33 by which the shaft 31 may be turned. A spring-pressed plunger 34 mounted on the clamp 28 cooperates with a circumferential groove 35 to hold the shaft 31 in the socket 30; and the groove 35 is provided with two substantially opposite notches 36 slightly deeper than the body of the groove for receiving the plunger 34 and holding the shaft 31 against accidental turning when in the rotation of such shaft the eccentric pin 32 is nearest and farthest from the magneto, for running and starting conditions respectively. Any other suitable means may be used instead of that shown for moving the pin 32 back and forth, and such back-and-forth movement need not be in a straight line although it is so in the mechanism shown.

The eccentric pin 32 is connected to a pin 40 on a downwardly projecting finger of the cross head 16 by a thrust toggle formed by an arm 41 pivoted on the pin 32 and two arms 42 overlapping and pivoted to the arm 41 and also pivoted to the pin 40. The pair of arms 42 duplicate each other in function, and in efiect form a single link, the two being provided to get a balanced action. A spring 43 acting between an upwardly projecting pin 44 on the clamp 28 and an upwardly extending finger 45 on the arm 41 tends to move such arm in a clockwise direction about the pin 32, and thus to set or cramp the toggle 41-42 by raising the pivot pin 46 connecting the arm 41 and the arms 42. The pivot pin 46 is lifted by the spring 43 to a point slightly above the line interconnecting the pins 32 and 40; but the upward movement of the pin 46 is limited by the engagement of a limit pin 47 between the arms 42 with a notch 48 in the arm 41, as is clear from Fig. 5. The arms 42 are provided with upwardly extending fingers 49, notched on their upper ends to receive the projecting ends of the right-hand pin 15 (Fig. 3) when the cross head 16 is turned in a clockwise direction from the osition shown in Fig. 1 to that shown in ig. 3, so that upon the engagement of such pin 15 with the fingers 49 the arms 42 are caused to move with the cross head 16 in a clockwise direction and thus to separate the limit pin 47 from the notch 48 and throw the pivot pin 46 below the straight line joining the pins 32 and 40, to break the toggle. When this movement has continued far enough, the toggle 41-42 collapses under the action of the springs 13 and against the action of the spring 43, and allows the cross head 16 and associated parts to swing from the position shown in ig. 3 to the position shown in Fig. 4, to produce an ignition spark at the electrodes.

In operation, the rod 27 is reciprocated by the cam 25 in the engine operation. This reciprocates the clamp 28. Normally, the parts are as shown in Figs. 1 and 5. As the cam 25 moves the rod 27 to the left, it acts throughthe toggle 4142 to move the cross head 16 and the movable part of the magneto from the position shown in Fig. 1 to the position shown in Fig. 3, against the increasing tension of the springs 13'. As this movement of the cross head 16 continues,the pin 15 engages the fingers 49 as described, and at the desired time for the ignition the continued movement of the cross head 16 causes such pin to break the toggle as described. Thereupon, the springs 13 return the cross head 16 and the movable part of the magneto to the normal position of Fig. 1, and the momentum of these moving parts carries them past the normal in the opposite direction to the position shown in Fig. 3, with the'toggle broken. As the cross head moves toward the position shown in Fig. 3, the finger 17 strikes the finger 18 and moves the movable electrode 18 away from the fixed electrode 20, so that a spark is produced at the gap between the electrodes by the flow of current caused by the momentary electro-motive force produced by the sudden movement of the movable part of the magneto just described. After a few oscillations, the movable member of the magneto becomes stationary in the normal position shown in Fig. 1. Meanwhile, the engine continues its operation, and soon the rod 27 is moved to the right. As the rod 27 thus moves, and carries the clamp 28 with it, the toggle 4142 is straightened out, and reset in cramped position by the action of the spring 43; whereu on during the next cycle of operation of t e engine the aforesaid action is repeated.

By reversing the position of the pin 32, by turning the shaft 31 180 by manipulating the operating wings 33, the time of the sparking operation may be retarded for starting, in which position it is shown, or advanced for running, in which position the pin'32 would be nearer the magneto and the ignition spark would occur somewhat earlier in the engine cycle.

In order to set the device to obtain the ignition spark at the proper time, the arms 41 and 42 are provided with holes 50 and 51, which are out of registry when the toggle is cramped as shown in Fig. 5, but which are in registry when the toggle is on the point of breaking as shown in Fig. 4. When the device is applied to an engine, the pivot pin 46 is pushed down until the holes 50 and 51 register, whereupon an ordinary nail 52 may be thrust through such holes to hold them in registry, as shown in Fig. 6. The engine is now turned until it reaches the point in the cycle where it is desired that the ignition spark shall occur, and the cross head 16 is turned in a counterclockwise direction as far as it will go, until it is stopped by the engagement of the pin 15 with the notches in the fingers 49. During this time, of course, the clamp 28 is loose on the rod 27; but when this has been done, and the parts have been moved to the ositions stated, the clamping screws 29 are tightened to clamp the member 28 on the rod in the position it then occupies. Then the nail 52 is removed, and the device is ready to operate.

I claim as my invention:

1. A magneto having an oscillating movable member which is spring-pressed to one position, in combination with a pushing member, a breakable toggle forming a thrust interconnection between said pushing member and said oscillating movable member, and a toggle-breaking member carried by said oscillating movable member and engaging one part of said toggle to cause the toggle to break upon a predetermined movement of said oscillating movable member.

2. A magneto having an oscillating movable member which is spring-pressed to one position, in combination with a pushing member, a breakable toggle forming a thrust interconnection between said pushing member and said oscillating movable member, and a stop carried by said oscillating movable member and movable therewith for engaging one part of said toggle and causing said toggle part to rotate with said oscillating movable member until the toggle is broken upon a predetermined angular movement of said oscillating movable member.

3. A magneto having an oscillating movable member which is spring-pressed to one position, in combination with a pushing member, and a breakable toggle forming a thrust interconnection between said pushing member and said oscillating movable member.

4:. A magneto having an oscillating movable member which is spring-pressed to one position, in combination with a pushing member, a breakable toggle forming a thrust interconnection between said pushing member and said oscillating movable member, and an adjustable pin on which one end of said toggle is mounted whereby the relation between the movements of said pushing member and said oscillating movable member may be varied.

5. A magneto having an oscillating movable member which is spring-pressed to one position, in combination with a pushing member, a breakable toggle forming a thrust interconnection between said pushing mem ber and said oscillating movable member, and a spring tending to set said toggle.

6. A magneto having an oscillating movable member which is spring-pressed to one position, in combination with a pushing member, a breakable toggle forming a thrust interconnection between said pushing member and said oscillating movable member, a toggle-breaking member carried by said oscillating movable member and engaging one part of said toggle to cause the toggle to break upon a predetermined movement of said oscillating movable member, and a spring tending to set said toggle.

7. A magneto having an oscillating movable member which is spring-pressed to one position, in combination with a pushing member, a breakable toggle forming a thrust interconnection between said pushing member and said oscillating movable member, means for locking the two parts of the toggle together at the position where the toggle is on the verge of breaking, and a push rod on which said pushing member is adjustably mounted.

8. A magneto having an oscillating movable member which is spring-pressed to one position, in combination with a pushing member, a breakable toggle forming a thrust interconnection between said pushing memher and said oscillating movable member, and a push rod on which said pushing member is adjustably mounted, the two members of said toggle being provided with overlapping parts in which there are holes which register when the toggle is on the verge oil tripping, whereby by inserting a pin through such registering holes the toggle members may be locked in the position where such holes register.

9. In combination, a magneto having an oscillating movable member which is springpressed to an intermediate position, said magneto having a cross head which moves with its movable member, a pushing member, and a breakable toggle forming a thrust interconnection between said pushing member and said cross head and pivotally connected to the latter at an eccentric point thereof, and an eccentric pin on said cross head in position to engage a member of said toggle and break the toggle upon a predetermined movement of said cross head.

10. A magneto having an oscillating movable member which is springpressed to one position, in combination with a pushing member, a breakable toggle forming a thrust interconnection between said pushing member and said oscillating movable member, means for locking the two parts of the toggle together at the position where the toggle is on the verge of breaking, and an engine-operated member for actuating the pushing member, said pushing member being adjustable relatively to said engineoperated member.

11. A magneto having an oscillating movable member which is spring-pressed to one position, in combination with a pushing member, a breakable toggle forming a thrust interconnection between said pushing member and said oscillating movable member, and an engine-operated member for actuating the pushing member, said pushing member being adjustable relatively to said engine-operated member, the two members of said toggle being provided with overlapping parts in which there are holes which register when the toggle is on the verge of tripping, whereby by inserting a pin through such resigtering holes the toggle members may be locked in the position where such holes register.

12. A magneto having an oscilating movable member which is spring-pressed to one position, in combination with an engineoperated member, and a permanent operating connection between said oscillating movable member and said engine-operated member for giving said oscillating movable member a snap action independent of the engine-operated member when the latter reaches a predetermined point in its movement.

13. A magneto having an oscillating movmember to snap under its spring pressure 10 able member which is spring-pressed to one independent of the engine-operated member position, in combination with an enginewhen the latter reaches a predetermined operated member, and an operating conpoint in its movement. nection between said engine-operated mem- In witness whereof, I have hereunto set her and said oscillating movable member, my hand at Indianapolis, Indiana, this 21st 15 said connection including pivotally connectday of July, A. D. one thousand nine huned parts for altering said operating condred and nineteen. nection to permit sald oscillating movable ARTHUR R. BAKER.

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