US934842A - Sparker mechanism for internal-combustion engines. - Google Patents

Description

H. SGHAAKE & J. T. GOWIE.

SPARKER MEGHANISM FOR INTERNAL COMBUSTION ENGINES.

APPLIOATION rum) JULY 27. 1908.

934,842, Patented Sept. 21, 1909.

W/TIVE88E8: INVENTORS fi W 1 Jcfl ml 601006 v I W 01124 I ATTORNEK light coil spring uNirnn sT T sraTENr onmcn HENRY SCI-IAAKE AND JOHN T. COWIE, OF WESTMINSTER, BRITISH COLUMBIA,

CANADA.

sranKnn MECHANISM FOR. m'rnnNaL comnus'rroN ENGINES.

Specificationof Letters Patent. Pate -fl ed Sept, 21, 1909,

Application filed July 27, 1908. Serial No. 445.598.

To all whom 'it may concern:

Be it know esthat we, HENRY SCHAAKE and by which the movable electrode of the.

sparker of an internal combustion engine moved intocontact with the stationary or 1nsulated electrode, and is designed to provide in a simple and effective manner against the mechanism being injured when the engine throws back owing to back firingin the cylinder.

There are also subsidiary f features in the manner of mounting the sparker plug to which attention is drawn in the following specification, reference being'made to the drawings-by which it is ac companied, of which Figure 1 is an end elevation of the sparker mechanism 'drive adjacent to the cylinder heads, Fig.2, a sectional elevation of the" mechanism on the line A A .in Fig. 3, Fig. 3, a plan, the T bearings of the lower cylinder sp'arker being removed, and Figs. 4, and

6, enlarged details of the drive bet-ween the vertical and horizontalshafts.

In these drawings 2 represents'thecylinder heads of the engine. 1 Rotatable in bearings 3adjacent to these heads is a horizontal shaft 4 which is driven by spiralgears 5 and 6 from a vertical shaft 7 which again is driven by spiral gears from the crank shaft of the engine.

On the horizontal shaft 4 opposite each cylinder head is a cam 10 which by an inclined face 11 and square drop (see the lower one. in Fig. 3) operates the trip lever 13 of the movable electrode. Fig. two bearings, one in the flange 15 of the sparker plug 16 and the other in one end of a T projection 17 from the same casting. A 18 between the lever and its hearing holds the trip lever just clear of the normal face of the cam 10.

The stein 21 of the movable electrode is also supported not only in its bearing in the; spark plug,

through which it passes, but externally in the other end of theT projectionmechanism on the The trip lever (see 2) is pivotally mounted at 14 between" 17.. The lower end of this stem 21 is. bent as at 22 to form the movable electrode and out-, side of the plug 15 between the bearings is securedlon the stem a short lever in engagement with the other end of the trip lever l3.v

The stationary or insulated electrode 25 passes through the spark plug and its anvil 26- within the cylinder is adjacent to the movable electrode 22.

A coil sprin 23 secured between the upper end of the spindle 21 and its bearings trode normally in contact with the anvil 26 of the fixed. electrode, but also holds the valve at the lower end of the stem 21 against spark plug to prevent the escape of gas past the bearing.

This mechanism, though substantially the same as what. is used in engines of this class and as the mechanislnof the 'movab e elecadjustment is not disturbed when for any moved, and the provision of the double bearings for the trip lever and the movable d'er wear. An essential feature however of the invention hes 1n the manner of 'drivmg shaft17 to prevent a throw back of the crank shaft injuring the sparkermechanism, which it would do if the shaft 4 were to be moved backward and the square face of the incline 11'of the cam allowed to engagethe trip lever 13. To guardiagainst this possibility the spiral gear 5 is free to-rotate and lift on the upper end of the shaft 7 and-rests upon a collar Sin which is a steel pin 9 beveled asshown in Fig. 5. The under or adjacent face. of the gear 5, (see Fig. 4:) is provided with a corresponding'beveled notch 12. This pin 9 in engagement with the square face of the notch 12 will drive the gear 5 in the required direction, but. if the shaft 7- turns in the opposite direction as in thetase of a blow back it will not rotate the-gear 5 or its connected shaft 4, asthe gear will by'the engagement of the inclined faces of' pin and notch be merely lifted off its seat on the collar Sagainstthe resistance of a coil spring. 19.

. The drive is an efiicient one, fully meets the underside of its bearing through the simple and. compact in its' arran ement,

reason the spark plug requires to be reelectrodes efficiently-supports these parts unthe horizontal 1 shaft 4 from the vertical serves not only to hold. the movable elec- 1 trode is all connected to the spark plug, its

the requirements of the case, and is simple and cheap in manufacture.

Although the features of improvement are small they are important to the-satisfactory driven from the crank shaft of an engine and a horizontal shaft which operates the vsparker mechanism of the individual cylinders which horizontal shaft is driven from the vertical one by spiral gears, of means for driving the gear on the vertical shaft said means comprising a pin secured to the shaft andofl'ering a square-face to the direction of rotation, a corresponding notch in the contiguous face of the driving gear which gear is free to turn and lift on the shaft the said notch having a square driving face to engage that of the pin on the shaft and a backward bevel so that when the vertical shaft is rotated in an opposite direction to that of the normal drive thespiral gear will be lifted out of engagement with the driving pin, and holding the gear down on the pin.

2. In a sparker mechanism of the class described, the combination with a vertical shaft means for normally driven from the crank shaft of the engine and a horizontal shaft from' which the sparker mechanismsof the individual cylinders are operated of means for driving the horizontal from the vertical shaft, said means comprising spiral gears the one 0n the vertical. shaft is free to turn and lift on a that shaft and rests on a collar thereon, a pin projecting upward from the collar the upper end of, which pin is beveled downward toward the collar, a beveled notch in the loose gear having av square drivlng face and bevel corresponding to that of the .pin,

and a spring between the upper end of the shaft and the loose bevel ear.

3. In a sparker mechanism of the class described, a sparker plug, amovable-electrode having a stem passing therethrough, a trip lever having a pivotal portion mounted on the sparker plug to operate said movable electrode, an upward projection from the sparker plug, said pro ection having bearmgs tofsupport the upper ends of the pivotal

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