US2021928A

US2021928A - Spark plug

Info

Publication number: US2021928A
Application number: US670061A
Authority: US
Inventors: Vincent Henri
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-05-09
Filing date: 1933-05-09
Publication date: 1935-11-26
Anticipated expiration: 1952-11-26

Description

INVENTOR .l

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Nov. 26, 1935. n v Hf VINCENT n vSPARK PLUG Filed May l9, 1955 Patented Nov. 26, 1935 UNITED ,STATES PATENT FFI'CE SPARK PLUG Henri Vincent, Sucrerie de Kom-Omba, Egypt Application May 9, 1933, Serial No. 670,061 5 Claims. (Cl. D23-169) This invention relates to a new and useful improvement in spark plug, the novel features of which will be best understood from the following description and the annexed drawing, in4 whichl I have shown a selected embodiment of the invention and in which:

Fig. 1 is an elevation of a spark plug constructed according to one embodiment of the invention;

, Fig.`2 is a section on the line 2--2 of Fig. 1;

Fig. 3 is a bottom view of the structure appearing in Fig. 1; y

Figs. 4 and 5 are face views of the two electrodes.

By the use of the term spark plug herein, I intend to refer to a device located in the wall of a combustion chamber and adapted to ignite gases therein. Usually, as is well known in the art, such a device is made in the form of a plug which can be readily removed and reinserted, although the invention is not limited to that particular form of device. For the sake of convenience, however, I shall employ'the term "spark plug in the following description and claims.

In Fig. 1, I have indicated at I a fragmentarypart of a wall of a combustion chamber having a threaded opening 2 therein in which may be threaded a spark plug 3.` This plug may comprise an outer shell 4 of metallic or other`conductive material, within which'isdisposed a core 5 of porcelain or other insulating material held in place in the shell by the gland ii.

Extending longitudinally through the core 5 is a rod 1 of conducting material having a cap 8 overlying the outer end of the core. This cap has a stem 9 upon which may be threaded'a nut I0, thus forming a binding post to which an electrical conductor may be secured. The shell is provided with the usual wrench-engaging faces I2 and with threads I3 to engage corresponding threads on the wall of the opening 2.

'Ihe inner end of the plug, by which is meant the end within the combustion chamber, is provided with two electrodes I4 and I5, and these electrodes extend a substantial distance beyond the inner end of the electrode, which end I have designated I6. The electrode I4,'which is here shown as the center electrode, is indicated as threaded into engagement with the rod 'I, thereby forming a continuous path for the flow of an electric current from the binding post to the electrode, whereas the electrode I5 is shown as the side electrode threaded into engagement with the shell Wall and thus forming a grounded connection, since the shell wall is threaded into engagement with the metallic wall I of the chamber.

The electrode I4 is shown as being of relatively massive construction and having an extended flat surface II, this surface being disposed so that it extends generally lengthwise of the plug but at 5 a slight angle to the axis thereof. The surface I'I faces the electrode I5, which may be formed of a rod having its outer end I8 bent or arched inwardly towards the center electrode and cut obliquely of its'length to form a relatively ex- 10 tended'surface I9, as best shown in Fig. 4. The surfaces Il and I9 are shown as being flat and substantially parallel to each other and generally close together so that a spark may readily pass between the two surfaces. The means for form- 15 ing the spark is, of course, well understood in the art, and no description thereof is necessary for an understanding of this invention.

I have found that, by use of the spark plug described above, the sparking is produced at a n0 point well Within the combustion chamber; it being noted in this connection that the surface I9 at the extreme end of the side electrode I5 is disposed adjacent the inner end 20 of the electrode' I4, thus promoting rapid ignition of the 25 carburated mixture and a consequent lessening of the time necessary for ignition. Moreover, the spark is produced away from the wall of the chamber and away from any other point where there might be a collection of burnt or neutral gases, this again expediting starting of combustion within the chamber and consequently starting of the engine. y

Another result which I have found lto follow from the improved construction is that, instead of producing a single spark, a group or shower of sparks is produced and, because of the inclined surface I1, this shower of sparks is directed toward the bottom or lowerend I 6 ofthe plug,- thus tending to clean the plug and maintain it 40 clean. I have found that by the use of this plug,

I have been able to operate engines for extended periods of time without causing the plugs to be clogged with carbon, grease, or other material,

in spite of the fact that a grade of fuel was being 45 used which would normally cause this result to follow. The improved results I believe to be caused at least in part by the features to which I have called attention above. Whatever may be they explanation, the result is a greatly improved 50 one.

Whilev I have shown the invention as embodied in a specific form, it is to be understoodl that various changes in details may be made Without departing from the scope of the invention, and 55 I therefore do not intend to limit myself except by the' appended claims. y v I claim:

1. A spark plug comprising two electrodes extending lengthwise of the plug beyond the 'end thereof, one of said electrodes having an extended substantially fiat surface disposed lengthwise of the plug and inclined to the axis thereof, and the other electrode having a relatively small surface disposed adjacent said surface on the first-named electrode.

2. A spark plug comprising two electrodes extending lengthwise of the plug beyond the end thereof, one of said electrodes having an extended substantially flat surface disposed lengthwise of the plug and inclined to the axis thereof, and the other electrode having a relatively small surface disposed adjacentV said surface on the first-named electrode and parallel thereto.

3. A spark plug comprising two electrodes extending lengthwise of the plug beyond the end thereof, one of said 'electrodes having an extended and substantially flat surface disposed lengthwise of the plug land inclined to the axis thereof, and the other electrode having a relativelysmall surface disposed adjacent said surfaceon the first-named electrode and adjacent the outer end thereof, at a location remote from said end.

4. A spark plug comprising center and side electrodes extending lengthwise .of the plug beyond the end thereof, the center electrode having an extended, elongated area with a substantially flat surface disposed lengthwise of the plug but at a small angle to the axis thereof, the side 'electrode having a relatively small area at its end disposed adjacent the relatively large area of vthe center electrode and disposed at a location wise of the plug and 'the other electrode having a 20 relatively small substantially flat surface likewise disposed lengthwise of the plug and facing vsaid surface on the first-named electrode.

` HENRI VINCENT.