US1505373A - Spark plug - Google Patents

Description

Aug. 19, 1924 1 1,5053 73 L. P. CARPENTER SPARK PLUG Filed Oct. 19. 1920 2E dar pani ET.

3 wumvboz age Q arfozueg Patented Aug. i3, 192%:

nane BOYD PINKNEF CARPENTER, OF PALESTINE, TEXAS.

SPARK PLUG.

Application filed October 19, 1920. Serial No. 417,580.

To all whom it may concern."

Be it known that I, LOYD PINKNEY CAR- PENTER, a citizen of the United States, residing at Palestine, in the county of Anderson and State of Texas, have invented certain new and useful Improvements in Spark Plugs, tion. This invention relates to improvements in spark plugs.

An important object of the pnovision of a spark plug so constructed as to eliminate the constant necessity of cleaning the sparking parts of carbon deposits. A further object of the invention is the provision of a spark plug so constructed as to intensify the spark in order to explode a relatively low grade of combustible vapor. A further object of the invention is the provision of a spark plug which has a plurality of adjustable sparking points arranged to provide a relatively large degree of surface over which the spark must travel to insure a proper ignition of fuel. Other objects and advantages will be apparent during the course of the following detailed description.

In the accompanying drawin s forming a part of this specification, an in which like reference characters designate like parts throughout the same.

Figure 1 is a side elevation of the improved spark plug.

Figure 2 is a cross sectional view taken through the improved spark plug and showin the sparking arrangement.

%igure 3 is a bottom plan view of the spark plug showing the sparking points.

In the accompanying drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral 5 designates a body casing, formed preferably of standard spark plug construction and which has the screw threads 6 thereon adapted to be threaded into the head of an internal combustion engine cylinder, and having the internal annular seat 7 there in. An insulating core 8 is provided, having the annular shoulder 9 thereon which is ada ted to vrest upon the annular seat 7 of the ody casing. It is preferr'edthat the insulating core 8 difier from the ordina spark plug construction, in that the sides of whichthe following is a specificathis invention is invention herewith shown and 10 contact with the interior of the body ee sing 5 and the bottom 11 thereof is flush with the bottom 12 of the body casing, thus elimimating and insulating core and in which carbon is the cavity intermediate the casing sometimes deposited. A clamping nut 13 is provided and adapted to bind against the shoulder 9 to maintain the insulating core 8 in position with respect to the body casing. It is preferred that the washers 14 be 6 provided intermediate the binding pointsadjacent the insulating core 8.

The ,main electrode 15 is centrally disposed within the insulating core 8 and has the screw threaded projection 16 thereon, provided to receive a thumb screw 17 for the purpose of clamping a terminal 18 of a cable 19 which leads to a battery or the like. Upon the lower end of the electrode 15, a multi-pointed head 20 is preferably integrally formed, and projects for a short distance from the bottom 11 of the insulating core. Neutral electrodes 21 are provided intermediate the head 20 and the outer surface of the insulatin core and S'which are so situated that eac one of them has a respective grounded in the body casing 5 and which project from the bottom 12 of the casing 5 each having an inturned head 24 arranged tangentially to the. plug axis, the upper edge of which just flush with the bottom of the main and neutrallelectrodes.

In the construction of the spark plugs here illustrated, it is-preferred that the head 20 have five points thereon, co-acting with the five neutral electrodes 21 and which in turn co-act with the five ground electrodes 23,

Since the insulating core 8 can be rotated within the casing 5, it can be readily seen that the shortest distance between any neutral electrode 21 and its respective ground electrode 23 can be or exciter of varying voltage can be used? and the spark plug adjusted to su'itthe voltij age. The spark thus produced within til/e cylinder will travel over a considerable distance, course from the main and to its respective neutral electrode 21.

It is to be understood that the form of my described is to be taken as a preferred point 22 at its shortest distance to the head. A plurality of electrodes 23 are varied. Thus, a battery;

example of the same, and that various changes in the shape, size and arrangement of parts may be made without departingfrom the spirit of the invention or the scope ofthe subjoined claims.-

Iclaim:' a

1. A spark plug comprising a metal body casing, an insulating core, a plurality of ground electrodes carried by the casing in depending. relation therefrom, a main elec- .trode and then to the ground electrode adjacent the same, said core being adjustable in-the body casing whereby the distances between the ground electrodes and their respective neutral electrodes may be varied. 2. A- spark plug comprising a .body casing, an insulating core, a plurality of ground 30 electrodes carried by said casing independing relation therefrom having-their lower ends inturned below the bottom of said core in tangential -.relation with respect to the plug axis, a main electrode carried by said core having a multi-pointed head embedded."

in and depending below the bottom of said core and having a point provided thereon for each ground electrode, and neutral electrodes separably carried by said core in insulated relation depending from thebottom thereof. a neutral electrode being provided for each point of the main electrodehead, each neutral electrode having its respective pointon the Inulti-pointed head located at the shortest distance between said neutral electrode and said head, said core being movable in the body casing whereby to vary the distance between the neutral electrodes and the ,inturned ends of their respective ground electrodes. I

LOYD PINKNEY CARPENTER.

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