US1536065A - Spark plug - Google Patents

Description

i Patented May 5, 1925.

UNITEDSTATES 'PATEPH'v OFFICE.

HERBERT E. BILLINGS, OF WOODSTOCK, IILIOIS, ASSIGNIB,` "DO HEB MANUFAC- TUBING COMPANY, 0F WOODSTOCK', ILLINOIS, A CORPORATION OF ILLINOIS.

SPARK PLUG.

" application inea ,my as, 1921. serial No. 485,109.

To all whom it may concern `Be itknown that I, HERBERT ll. Bunnies, a citizen of the Unitedv States, kresiding at IVoodstock, in the county ofh/[cIcIenry and State ol Illinois, have inventedv a certain new and useful Improvement in Spark Plugs, of which the following-is a lfull, clear,

concise, and exact description, reference being had `to the accompanying drawings, forming apart ot' this specification.

This invention relates to spark plugs and more particularly` to a self-cleaning spark plug.

It is a purpose oit the invention to provide a spark plug that is seit-cleaning, that is, one that keeps the porcelain thereof clean o' carbon, byidrawing a cleansing mixture over the same. y

It is more particularly a purpose ofthe invention to provide a spark plug having a jacket forming a passage therearound communicating with the intake of an internal combustion engine and also communicating with the internal hollow or bore of the spark plug, so as to draw the explosive mixture, which isalso a cleansing mixture, over the suri'ace ofthe porcelain seated in said plug to clean the same. y

It isa further purpose ot the invention to j 'n'ovide a sparlcplug ot the above mentioned clntracter that is provided with sucha large `nunlber ot openings conuininicating from said passage to the interior ther-cot as to provide closely spaced openings separated only by small web portions, whereby the cleaning mixture is thrown against substantially the entireouter surface of said porcelainl j It is a further object of the invention to provide a detachable jacket member provided with a beveled ground shoulder. engaging a corresponding beveledshoulder on the body portion of said plug to provide a `tight joint between said jacket and body portion, and "to provide a' aycket member that is held in on the body memberby a tightening nut screwthreadedly engaging said body mem-j ber, thus tightening said jacket member entirely independent o't the screw threaded connection between the spark plug and engine cylinder. i

Itis also a purpose of' the invention to provide a spark plug wherein the electrodes project beyond thebody portion thereofA and wherein `said electrodes are provided with lresh explosive `mixture with each intake f' provide a check valve in said suction con` nectioincoinprismg a ball mounted therein,

and adapted to move between a stop on said ring and l a seat in a sleeve-like member mounted in said suction connection, so as to open and close the same, said ball having a very slight movement, whereby all springs in said check valve can be eliminated.

@their objects and advantages of the invention will appear as the description of the accompanying drawing proceeds. However, I desire to have it distinctly understood that I do not intend to limitmyself to the exact details shown therein and described in the specification, but that I intend to include as part of my invention all such obvious changes and modilications ot parts as would occur to a person skilled in this art and as would fall within the scope ot the claim.

In the drawings: j

` Figj'l is a side elevation partly in section of my sel't cleaning spark plug;

i Fig.` 2 is a scc-tion thereof taken on line 2 2 of Fig. l and `Fig. 3 is a view similar to Fig. 2 of a modiiication. j j

`lteferring in detail to lthe drawing, the improved sparkplug comprises a body por-` tion 5 having a threaded end portion 6 which is adapted to engage with an internally threaded opening in an engine cylinder, saidl der 11, said shoulder 11 being beveled and being adapted to act as a stop for the shoulder 12 on the porcelain or other insulating member 13 which extends within the bore of the main body portion 5, and which is provided with a downwardlyv extending portion 14 in which is mounted the electrode 15 which cooperates with the electrode 7. h/Iounted; between the porcelain 13' and the shoulder 11 is a brass or other metallic washer 1G. The porcelain is held in place by means of the bushing` 1T having the hexagonal portion 18 which is adapted to be engaged by a wrench for turning the same, said bushing 17 engaging the shoulder 19 on the porcelain 13 and havingV a packing 20 interposed between the same and the porcelain. The outer end portion 21 of the porcelain 13 is provided with a binding screw 22, to which wire from the ignition system may be connected.

The main body portion is provided with a beveled face 3k which is conical in forni,y and which is provided substantially midway thereof with an annular groove 24 extending therearound. The outer face of the member 5 at 23 is ground to the proper bevel, and a ring 25 which forms a jacket is adapted to seat thereon, said ring 25 being provided with a `ground beveled face 26 corresponding to the face 23. The body portion 5 is also provided with a threaded portion, 27 which is adapted to be engaged.

by the nut 28 so that when the nut 28 is turned down on the threads 27', the nut 28 will engage with the ring 25 and force the same downwardly on the body portion 5 so as to clamp the beveled faces 28 and 26 together to form a tight joint.

Extending inwardly from the groove 211 is a plurality7 of equi-distantlyi spaced passages 29 separated by web portions 80. As shown Ain Figs. 1. and 2, the passages 29 may be formed by cutting the same with a circular cutter` so as to form a wide. cut, and expose substantially the entire outer surface ot the portion 14i of the porcelain 13 to the stream of or air passing inwardiy from the same into the interior ofv the body portion 5. This will be clear from Fig. 2. If desired, however, a large number of openings can be drilled as shown in Fig. Si, said openings being indicated by the numeral 29 separated by the webs` 30. 1t will be noted from Fig. 1 that the passages extend at an angle to a section that would be perpendicular tothe axis of the plug so that the stream of gas or air passing from the same inwardly thereof `(o the porcelain will be directed at an angle against thev same. The ring 25 is provided with a hollow boss or tubular extension 31 and has a pair of openings 32 therein connecting` the interior 33 of the boss or tube 31 with the passage 241 formed by placing the ring 25 over the groove. The tubular portion 31 is provided with a shoulder 34 and with a sleeve 35 mounted therein, said sleeve 35 being provided with a seat 3G at the end thereof for the ball 37. The outer end of the tube 31 is provided with a nut 3S which engages with the enlargement 39 on the pipe' 40 for providing a. tight connection between` the suction pipe i0y andthe tubular member 31. The ball 37 is adapted to move between the shoulder 32 and the end of the sleeve 35. Said ball has a very small amount of play andl will' move from the opened position against the shoulder 34 to the closed position against the sea-t 36 at the end of the sleeve without the necessity of providing a spring for this movement, the ball moving such a slight distance that the pressure of the gas in the cylinder will close the valve. rlhe suction pipe 40 is connected with the intake manifold of the engine so that as the suction stroke of the cylinder, to which the spark plug is connected, takes place, the explosive mixture is drawn through the pipe 4() past the valve 37 through the passages 32 into the passage 24 and then through the passageway 29 or 2t" as the case may be, when it strikes the procelain 13 at the tapered portion 14 thereof that carries the electrode 15 and as this mixture strikes substantially the entire outer surface of the porcelainy at this point at aconsiderable velocity, and as the mixture. contains gasoline, which is a cleaning agent, the porcelain of the plug will be effectively cleaned over the entire exposed surface thereof, and short circuitingv of the plug due to carbon is thus prevented.

It will be noted that the electrodes 7v and 15 extend beyond the plug` as is customary,V and it is unnecessary that these be cleaned by the explosive mixture, as the carbon thereon does not do the damage that is caused by carbon on the porcelain which will short circuitI the plug.

It. will also be noted that due to the factthat the explosive mixture is drawn through the plug, a rich clean mixture will be presented atthe electrodes, thus avoiding any difficulty due toimproper scavenging of the engine which would be liable to cause a burnt and non-explosive gas to be present adjacent the electrodes.

Having thus described my invention, What I desire to claim and, secure by U. S.- Letters Patent is:

A spark plug of the character described, con'iprising a shell having a body portion provided with a. longitudinal bore having an unrestricted opening in one end thereL of, an electrode carried thereby, an insulatingl member mounted in said bore and spaced lll) onY all sides from said body portion, an l A.ing from said passage into Said bore near the inner end thereof, said' openings being inclined at an oblique angle to the axis of said plug, anda suction connection lead-- ing into said annular passage. 1n In Witness whereof, I hereunto subscribe my name This 22nd day oft July, A. D. 1921. l

HERBERT BILLINGS.

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