US1249316A - Spark-plug. - Google Patents

Description

,Lmwmm G. L. BREWER.

SPARK PLUG.

APPLICATxoN FILED mmmz. i911.

Patented Dec. 11, 1917.

ma. /wwm amy 4 MWh/1 w titl Specification oi Letters Patent.

Application led March 22, wl?.

To all unioni it may concern:

ide it known that l, ,GOVERNOR lL. BREWER, e eitizen ot' the United States, residing :it ltilent City, in the county of lient and State oi. li/lichigsn, have invented certain new end useful improvements in Sperkljlugs; and ll do hereby declare the following to be aa full, elettr, and exact description of the invention, such as will enable others skilled in the ort to which it nppcrteins to 'make and use the seme.

This invention relates to spark plugs for igniting the intlainmable charges of internal combustion engines by means of electricity; sind it consists in the novel construction and combination of the ports hereinafter iully described end eleinied.

in the drawings, Figure l is e longitudinel section through e spark plug constructed `soeording to this invention. Fig. 2 is a side view of the plug turned trotted one-quarter from the position shown in Fig. l. Fig. 3 is e eross-seotion, teken on the line m-m in Fig, l. A

rChe body portion 2 of the plug is adapted to be screwed into e cylinder in the usual wey. .du insulating sleeve 3 is secured in the body 2 by means ont e screwthreeded coller il. A lower spark stein 5 is secured in the sleeve 3 by Ineens of nuts 6 which are screwed on the stern, sind which enable its position in the sleeve 'to be sdj usted longitudinelly. A stationery electrode 7 is secured to the bottom ot the plug body, und preferebly consists of s steple-shsped piece of wire which extends erosswise under the bottom ond of the stem A screwthreaded coller 8 of insulating ineterisl is secured on the upper end portion ot' the stern 5 between the upper end of the sleeve 3 and the upper nut, and the fristening collar flis made large enough to slip over it. tubular chamber 9 is provided, endv its lower end portion is screwed on the smell coller 8. The insulating sleeve 3 has e projecting coller l0 et its middle part, and l2 are washers on opposite sides of this-coller which prevent the sleeve 'troni/being broken when it is cluinpedin piece. y,

The tubular chamber 9 hes openings it Patented Deo, itt, tbtll't.

serial 1ro. 156,613.

on eech side which form sight holes, and e plug of insulating material 'is secured in 1S, und secures the conducting wire 19vto it, and also locks it in position in the plu l5. The edjacent ends of the upper an lower stems 18 and 5 are arranged 'et the middle part of the sight tube, and form et spark gzip so that the sparks can be seen through the sight holes of the chamber.

The sparks seen through the sight holes show clearly when the device is working properly, and the additional spark gap oper-- A thumb-nut 20 is screwed on the upper projecting end portion of the stem* etes to intensify the action of the sparks of the lower spark gap by which the igni* tion of the iniiainmuble charge in the vcylinder is effected.

What l claim is:

ln e spark plug, e body portion provided.

with an electrode at its inner end, an insuluted lower spark stern supported 1n the .said body portion, an externally screwthrefided collur ot' insulating materiel' and st washer of insulating material secured at the outer ond of the seid body portion, o tubular sight chamber having its lower end screwed on the said collar und bearing on the said washer. u 'plug of insulating material screwed into the upper end of the sight chunnber1 un upper spark stein supported inV the suid plug and forming un upper spark gap with'the lower spark stem. andfzrglass sight tube urrnuged in the sight chamber and clamped between the seid collar and plug and permitting the spark of the upper spark gap to be seen in the sight ehember.

ln testimony whereof l have eiiixed my signature.

ooveinton L. nenwnn,

Images