US1314406A

US1314406A - Spark-pi

Info

Publication number: US1314406A
Authority: US
Publication date: 1919-08-26
Anticipated expiration: 1936-08-26

Description

ing

*extends the central electrode 13 in JOSEPH ERWINE KUEHNE, F NEWARK, NEW JERSEY.

SPARK-PLUG;

Specification of Letters Patent.

Patented Aug. 26, 1919.

Applicationflled June 20,1918. Serial No. 240,955.

To all whom it may concern Be it known that I, JOSEPH E. KUEHNE, a citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented a new and Improved Spark-Plug, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved spark plug arranged to effectively protect the porcelain insulator against injury liable to be inflictedon accidentally dropping the spark plug or twistthe same when screwing it up or unscrewing it by the use of improper wrenches or other tools. Another object is to prevent rain water, spray, and other moisture from passing into the spark plug and thereby dis-' posing of one of the causes which induces short circuiting. Another object is to permit of readily taking the spark plug apart whenever it is desired to do so, repairing or other, purposes.

\Vith these and other objects in view, the invention consists of certain novel features of construction as hereinafter shown and described and then specifically pointed outin the claims.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in both views.

Figure 1 is a sectional side elevation of the spark plug with the porcelain insulator and the electrode shown in section; an

Fig. 2 is a sectional side elevation of the head or cap of the plug.

The shell of the spark plug is provided with the usual threaded end 11 screwing into the tap opening of the cylinder on which the spark plug is used. The spark plug is provided with the

usual electrodes

12 and 13, of which the electrode 12 attached to the end 11 of the shell 10. The electrode 13 is the central electrode and is in the form of a rod.

Into the shell 15 of-a conical plug polygonal base 17 for the application of a wrench or other tool to screw the plug 16 into the shell'10 or out of the same. The plug 16 is provided at its lower and upper ends with

interior seats

18, 19, of which the d by the enlargement 20 of seat 18 is engage I the porcelain insulator 21 through which the usual 16 provided with a for cleaning,

10 screws the threaded end manner, The lower portion of the porcelain insulator 21 extends within the shell 10 and the portion directly above the enlargement 20 extends through the plug 16 and its upper end extends into a large bore of a head or-cap 26 made of bakelite, hard rubber, fiberor other suitable insulating material. The header cap 26 is provided with a reduced portion 27 fitting into the seat 19 of the plug 16, and the exterior surface of the head or cap is made conical and forms a continuation of the exterior surface of the pl11g16. The upper end of the head or cap 26 is provided with a central small bore 28 through which extends the upper threaded end of the central electrode 13. A lock nut 30 screws on the upper threaded end 29 of the central electrode 13 against a spring washer 31 held on the top of the head or cap 26. and a binding nut 32 screws on the threaded end 29 for clamping a condpcting wire in position on the end 29 of the central electrode 13 and against the lock nut 30. A collar is arranged on the central electrode 13 and is seated on a shoulder 36 formed in the porcelain insulator 21 'to draw the enlarged portion '20 in firm contact with a packing 40 held on the bottom of the seat 18 on screwing up the lock nut 30 on the threaded end 29 of the central electrode 13.

From the foregoing it will be seen that by the arrangement described, the porcelain insulator 21 is wholly contained within the shell 10,- the plug 16 and its head or cap 26, and consequently the said porcelain insulator is not liable to be injured on dropping the spark plug or on twisting the same when screwing up or unscrewing it from the cylinder. It will also be noticed that the several )arts forming the spark plug can be readi y taken apart for, cleaning, repairing or other purposes, it being understood that it is only necessary for the operator to unscrew the plug 16 from the shell 10 and to unscrew the

nuts

32 and 30 from the threaded end 29 of the central electrode 13 to allow' trode 13 through the porcelain insulator 21 and the said head or cap 26 the central electrode is held out of contact with the metallic parts of the spark plug and short circuiting is prevented. It will also be noticed that the head or cap 26 forms a continuation of the plug 10 and effectively prevents Water or moisture from passing into the spark plug thus disposing of another cause for short circuiting. It is understood that any water which may drop onto the plug 16 and its cap 26 is readily shed owing to the conical shape given to the said parts. By giving the plug 10 and its head or cap 26 a conical shape no undesirable projections are formed. \Vhen the internal combustion engine on which. the spark plug is used is stopped the porcelain insulator :21 is usually in a hot state, but as it is protected against cool breezes, water or the like, it is not liable to crack or break by extraneous influences of a lower temperature and the insulator can cool off gradually.

aving thus described my invention, I claim as new and desire to secure by Letters Patent:

1. A spark plug, comprising a shell provided with an electrode, a conical plug screwing into the shell and having at its lower end a seat, a conical removable head of insulating material mounted on the upper end of the plug so that its exterior surface is flush with the exterior surface of the plug, an insulator, the insulator being wholly within the shell, plug and head, and a central electrode extending through the insulator and the insulating head of the plug and binding means carried by the central electrode to hold the plug, insulated head, and insulator in juxtaposition provided with a binding nut.

A spark plug, comprising a shell provided with an electrode, a conical plug screwing into the shell and having internal seats at its upper and lower ends, a conical removable head having a reduced lower end fitting in the seat at the upper end of the plug, an insulator having an internal shoulder and an enlargement seated on the lower seat of the plug, the insulator being wholly within the shell, plug and head, a central electrode extending through the insulator and insulating head and having gaging the shoulder of the insulator, and binding and locking nuts on the threaded end of the electrode.

JOSEPH ERlVINE KUEHNE.

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