US1425476A

US1425476A - Spark plug

Info

Publication number: US1425476A
Application number: US400928A
Authority: US
Inventors: Frank A Henkle
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-08-03
Filing date: 1920-08-03
Publication date: 1922-08-08
Anticipated expiration: 1939-08-08

Description

F. A. HENKLE.

SPARK PLUG. APPLICATION FILED AuG.3, I92o 1,425,476, PaIenIedAug. s, 192.2.

INVENTOR ATTORNEY WITNESS-F*d FRANK A. HENKLE, OF '.POMONA, CALIFORNIA.'

SPARKv rLUa Patented Aug. 8, 1922.

Application led August-3, 1920. Serial No. 400,928.

To all whom it may concern:

Be it known that I, FRANK A. HENKLE, a

`citizen of the United States, residing at Pomona, in the county of Los Angeles and State of California, have invented new and useful Improvements in Spark Plugs, of which the Jfollowing is a specification.

' The object of my resent invention4 is the' provision of a slmple and practical ls)p1ark plug of high eiiiciency and durai ity.

To the attainment of the foregoing the invention consists in the improvement as hereinafter described and definitely claimed.

In the accompanying drawings, hereby made a part hereof Figure 1 is a diametrical section of a spark plug constructed in accordance with y minvention igure 2 is an elevation of the inner end of the plug.

Figures 3, 4, 5, 6, 7, and 8l are views re 2 and showing modifications hereina ter explicitly referred to.

Similar numerals designate corresponding parts in Figures 1 and 2 to kwhich reference will first be had.

Among other elements my spark plug comprises a metallic bushing 1, threaded at 2 for connection to the cylinder of an internal combustion engine and having an interior abutment 3 as well as a socket 4 in its outer end, interiorly threaded at 5.

The innen portion of the bushing 1 is chambered as shown.

The spark plug also comprises a dielectric member 6 having in its inner end a' chamber 7 and also having abutments 8 and 9 and a longitudinal central bore 10. The dielectric member 6 is arranged in t-he bushing 1 and is secured in position by the nut 11; gaskets 12 and 13 being interposed between the member 6 and the bushing 1 and between the nut 11 and the abutments in the bushing 1 and on the member 6, respectively, as shown. The main electrode 14 which extends through the bore 10 of the member 6 is provided in the chamber 7 with an enlargement 15, on which is arranged a gasket 16. All of the gaskets referred are preferably of ireproof material, and

they serve eifectively in preventing leakage through the plug. Mounted on the outer threaded portion of the main electrode 14 are the usual nuts 17 and 18. The elements thus far described are not of my nvention, though I prefer to use the construck tion of the bushm of the tion made up to these elements because of 1ts practical utility.

In furtherance of my invention the main electrode 14 is arranged with its inner end substantially flush with the inner end of the bushing 1, and on the said inner end ofthe main electrode are steel bristles 19,` electrically connected with the main electrode and having their outer ends separated by an annular space from the adjacent por- By virtue of'te provision of the steel bristles -19 arranged as set forth, it will be manifest that on the suction stroke of an engine the brush formed by the bristles will beflexed inwardly vto a slight extent, and on the compresslon stroke explosive mlxture will be compressed through and past the bristles l9,and into the inner portion plug as shown in a chamber oposed to the bristles. The effect of this 1s to clear'and keep clear the gap or the annular space between the steel bristle brushl and the inner end of the bushing 1.`

From this it follows that when current is su plied to the main electrode 14 sparks wil jump from the ends of the bristles 19 to the adjacent' end of the ground bushing 1. Manifestly the explosion will be attended by jarring of the bristles sufficientl to displace any dry soot or oilA that may ave accumulated thereon incident to the suction or compression strokes. It will also be apparent in this connection that when the explosive mixture compressed in the chamber in the inner portion of the bushing 1l is exploded any soot collected on the face of the walls of the plug will be thoroughly burned by reason of the brush constructed of the bristles19 forming a deiector, calculated to spread the ame and direct the same against the wall of the plug. It will be further noted that any carbon that may collect at the inner end and the bristles 19c being carried by theinner bushing lb and being separated by an anlnular space from the bristles 19h.

In the modification shown in Figure 5. a bunch or bunches of bristles 19dl are carried on the bushing `l, and a complementary bunch or bunches of bristles 19e are carried on the main electrode 14.

'In the modification shown in Figure 6 a bunch of bristles 19t carried by the main electrode are arranged with their. outer ends in spaced relation to the inner end of the bushing -lf.

In the modification shown in Figure 7 a head 14g is carried at-the inner endA of the main electrode and is provided with an arcuate face 14 opposed to and separated from an arcuate series of bristles 19@ electrcally connected with the bushing lg.

In the modification shown in Figure 8 a T-head li isopposed to and spaced from bristles 19j electrically connected with a bushing of ground electrode l1.

Manifestly all of the modifications shown and described fall within the purview of my broad invention which consists in the provision-of steel bristles between the main electrode and the bushing or ground electrode at the inner end of a chamber rovided in the ortion of the bushing or ground electro e.

Having described my invention, what l ments and separated by a gap bordered by free bristle ends vall in the same y plane from the other element.

2. A spark plug comprising a metallic bushing chambered at its inner end, a dielectric member disposed in the bushing and having a longitudinal central bore, a main electrode extending through the bore of the dielectric member and resting in the chamber of the metallic bushing, and bristles interposed between the inner portions of the main electrode and the bushing and disposed in a lane extending at right angles to the lengtli thereof and carried by one of said members and separated by a gap bordered by free bri'stle ends all in the same plane from the other of said members.

In testimony whereof l aliix my signature. I

FRANK A. HENKLE.