US1324875A - Spabk-plug - Google Patents

Description

- 1. BURGKEHT.

SPARK PLUG. APPLICATION FILED SEPT. l-5 19H- v Patented De@.16,1919;

UNITED STATES PATENT oEEICE.

JOSEPH BURGERT, OF LAKEWOOD, OHIO, ASSIGNOR OF ONE-THIRD TO MAX P. GOODMAN AND ONE-THIRD TO GEORGE JANOWITZ, 'BOTH OF CLEVELAND,

OHIO.

SPARK-PLUG.

Specication of Letters Patent. Patented Dec. 16, 1919.

Application filed September 15, 1917. Serial No. 191,523.

T 0 all lwhom t may concern:

Be it known that-I, JOSEPH BURGERT, acitizen of the United States, residing at Lakewood, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Spark-Plugs, of whichv the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to spark plugs for use as the ignition terminal for internal combustion engines. The object is to provide, in a simple form, a plug which shall automatically drain liquid deposited within the plug or on the electrodes and thus lmaintain the contact points clean and avoid the troublesome carbon deposit on the electrodes, which results with many plugs. l

In accomplishing the above end, I provide the central electrode of the plug in a form which presents a small cup for catching liquid gasolene or oil running down from the interior of the plug, the exterior of this cup coacting with the other electrode while the interior is drained at one or more points comparatively distant from such other electrode. `The side' electrode carried by the wall of the plug is formed into hook shape,

the inner extremity of which stands adja-,

cent to the outer edge of the cup of the central electrode. 'The sparking therefore, takes place from the high points of both the cup and the hook, and liquid on the hook or the outside of the cup, forming in a drop at the lowest point, is immaterial.

By the above means I am able to preserve the parts of the two electrodes where the fspark is formed free from liquid and the resultant carbon deposit. My invention is hereinafter more fully explained and .its essential characteristics are summarized in the claims.

In the drawing, Figure 1 is a side elevation of my improved spark plug; Fig. 21s a vertical central section of the same; Fig. 3 is a bottomplan of the plug; Fig. 4f is an enlarged cross section through the two electrodes, on the line ot' Fig. 2 looking downwardly.

In the drawings, 10 indicates the outer or metal sleeve member of the plug. This is shown as having an externally threaded ortion 11 adapted to screw into the engine ead, an external annular shoulder 1:2 to

limit the movement, and an angular portion 13 for the application of a wrench. The side electrode 20 is carried by the lower end of the threaded sleeve 10. This electrode is made in the hooked form shown, its hooked portion lying in a radial plane and pointing toward the head of the plug.

30 indicates the central electrode which is carried axially within a suitable insulating sleeve 40. This sleeve is shown as having an annular boss l which rests on an internal shoulder of the metal sleeve 10. A metal clamping bushing 50 is threaded into the upper portion of the sleeve 10 and bears downwardly against the upper shoulder of the boss Li1. Suitable metallic rings may be provided at the upper and lower` shoulders ofthe boss 41 to make a gas-tight connection between the insulation and metallic sleeve.

The lower end of the rod 30 continues below the insulating sleeve in a stem 31, which may be enlarged and abut the lower end of the insulation. This stem carries concentric with it a peculiar cup-shaped head 32. This head has a rounded end, and a conical Wall surrounding the stem, and leaving an annular groove 33 withinthe cup and about the stem. One or more draining openings 34 are formed through the wall of the cup at points relatively distant from the end 21 of the side electrode.

The conical form of the cup causes it to present a sharp upper edge which, at one point, Stands adjacent to the end of the re-curved portion 21 of the side electrode. The sparking, therefore, takes place between these points. As these points are the highest parts ofthe side hook and of the central cup, they are kept free from the liquid which may be deposited thereon. Any liquid deposited on the stem or the insulating support drains into the cup, and from thence drains through the openings 34.- away from the point 2l.

The head '32 may be formed on'the electrode rod 30 in any desired manner. It is very convenient to make it an integral portion of the rod and to provide the enlargement 31 of the rod at 31 just above the cup'. lVith such construction the rod 30 is inserted into the insulating sleeve from below. The connection at-.the upper end of the central electrode rod may take any form desired. I have shown a nut 60 screwing onto thevrod and bearing against the upper end of the insulating sleeve 40. Above this nut is a clamping thumb nut 61.

It will be understood from the description that my spark plug is simple in construction and may be cheaply made. Due to the peculiar formation of the cup on the central electrode, I maintain the sparking parts constantly in clean condition for most eflicient sparking.

Having-.thus described my invention, what I claim is:y

lM In a spark plug, the combination of a metallic sleeve, an electrode carried thereby and projecting wardly, an insulating plug within the sleeve, a rod occupying the sleeve carrying an electrode at its lower end, said last mentioned electrode having an upwardly facing cup-shaped head, the edge of which is adjacent to the end of the electrode irst, mentioned, there being a groove within the cup-shaped wall below the insulating plug and a draining opening through the side wall of the cup, which opening is relatively distant from the electrode first mentioned.

2. In a spark plug, the combination of a metallic sleeve, an electrode carried thereby, an insulating plug within the metallic sleeve9 a central rod within the insulating plug, an extension on the rod below the insulating lplug terminatingin an integral upwardly facing cup, said cup leaving an annular groove betweenit and the body of the extension, draining openings through the wall of the cup on opposite sides of the extension, the electrode first mentioned terminating adjacent to the wall of the cup at a point between the draining openings.

3. In a spark plug, the combination of a metallic sleeve adapted to screw into the engine, an electrode carried thereby in the form of a hook with an upwardly extending inner portion, an insulating sleeve carried by the metallic sleeve, and an electrode rod mounted in the insulating sleeve and having a head at its lower end, said head being approximately in the form of an inverted mushroom, the edge of which at one place stands adjacent to the point of the hook, said head having a cavity 'behind its wall and there being a draining opening through the wall at a place relatively distant from the point of the other electrode.

In testimony whereof, I hereunto ax my signature.

JOSEPH BJURGERCTe

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