US946878A - Spark-plug. - Google Patents

Description

J. E. SGHAEPER, Jn.

SPARK PLUG.

Arrmcmm Hui) 11212.23. 1999.

Patented Jam 18,1910.

10513123 E. SCEAEFEB, IBM 0F CLEVELAND,

OHIO, ASSIGNOR TO CHARLES W.l FENNER,

or cLEvELnNp, 0310.110114@ Busin-Ess' UNDERJ mani-NAME REFLEX ieNrrroN co.,

F CLEVELAND, 01116.

SPARK-PLUG.

Spcccation of Letters Patent.

Patented Jan. 18, 1910.

Application led February 23, 1909. Serial No.V 479,379.

.i of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Spark-Plugs; Vand I hereby eclare the following to.I be' a full,'clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

Thisinvention relates to new and useful im rovements in s ark plugs.

ne object of this invention is to' provide a spark plu having such an arrangement of parts as wi l allow thev gas from the engine cylinder ready access to the interior of the casing ofthe plug so 'that it will surround the ends ofthe electrodes and be readily ignited by the spark. A A further object of my invention is to provide a deflector or baillearran ed within the plug casing, the action of which will be to stevent the lubricating oil from the cyliner of the en 'ne being forced back .into the rear part of t e plug casing, where it would -of the same.

become carbonized on the wall of the casing and form a cross circuit between the electrodes of the spark plug.

With these objects in view my invention consists in thecombination of parts as described in the specification, pointed out in the claims and il ustrated in the accompanyinl drawings. i

n the accompanying drawings Figure 1 is an exterior view of a spark plug embodying my invention. Fig. 2 is a central section Fig. 3 is an end view of the same.

Again referring to the drawings 1 represents the casing or shell of the spark plug which is provided with the usual screw thread 2 whereby it maybe screwed into the eng-ine cylinder.

ab y provided with flat faces 4 for the application of a wrench in screwing it into position. In the lower part of the `casing is `ar-v ranged a chamber 6 and in the upper part a screw-threaded bore 7. A seat 8 is preferably formed in the bore 7 below the screwthreaded portion.. In the closed end of the casing 1 is formed a central opening 9 and the sides of said opening are beveled so that the opening at the outside of the casing is The vcasing is also preferl smaller than the opening at the inside and the wall around the opening at the outside of the casing is therefore very thin and may be said to have a knife-edge and forms one of the electrodes. On opposite sides of the opening 9 are formed other openings 10, the object of which will appear later.

Within the casing is arranged a spindle 12 which is preferably screw-threaded at its outer end and at its inner end is provided with an enlargement or head 13 which is approximately cone-shaped. In the lower end of the head portion 13 is inserted a pin 15 of any suitable material to form the other electrode. On the head portion 13 is arranged abafile or deiector consisting of a funnel or saucer sh. ed flange 16. lThe spindle 12 is insulated) from the casingpin any suitable manner and as shown in the drawing this insulation consists of an inner wrappin 18 of Sheet mica and an outer casing o mica rings 19. The insulating niaterial is provided with an annular shoulder 2O which is adapted to t on the seat 8 formed in the. casing. An exterior screwthreaded sleeve 21 is provided, which screws into the upper end of the casing and clam s the shoulder 20 on the insulation against t e seat 8 thereby holding the same rigidly within the casing. Washers 23 and 24e are preferably arranged above and below the shoulder 2O on the insulation. A washer 25 is arranged on the s indle above the insulation and on the spindle above the washer usual manner.

i When the plug is in use the gas from the c linder will readily' enter the chamber 6 t rough the openings 10 and the ends of the electrodes will be entirely surrounded by the gas so that the passage of the spark between the electrodes will readily ignite the same. After a few explosions the inner end of the spindle 12 and the Ybaiile 16 thereon will of course become very hot. After each eXplosion the cylinder oil will be driven into the rear part thereof where it would become carbonized and form a short circuit, but in chamber 6 will strike the battle 16 which will prevent the 'oil reachin the rear part of the chamber and as the oi strikes the baiile 16 chamber 6 and in ordinary constructionsv 'would be deposited upon the walls on the the present constructionthe oil entering theare arranged the adjusting nuts 26 in the 'I a rounded end which is provided with a central opening and small openings arranged adjacent to. said central opening, the Wall 'around said central'opening constituting an electrode and the central opening and openings adjacent the central opening permitting admission and exhaust of gas to and from the casing, a spindle arranged within the casing and insulated therefrom, anelectrode carried by said spindle, and a saucer-shaped baie on said spindle and turned toward the openings in the rounded end of the casing, said baffle serving to catch the oil driven into the casing with the gas.

In testimony whereof, I sign the foregoing specificatiomin the presence of two Witnesses.

A JGSEPH E. SCHAEFER. Jn.

Witnesses:

VICTOR VC., LYNCH, N, MoDoNNELL.

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