Sparking plug.

(Application filed Mar. 25, 1902.)

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THE NORRIS PETERS CO . PHOTO-L1THO.. WASHINGTON, O. C.

United States Patent Office.

CHARLES A. MEZGER, OF BROOKLYN, NEW YORK, ASSIGNOR TO MINNIE MEZGER, OF BROOKLYN, NEW YORK.

SPARKING PLUG.

SPECIFICATION forming· part of Letters Patent No. 700,147, dated May 1 3, 1902.

Application filed March 25,1902, Serial No. 99,902, (No model.)

I annular shoulder c², and this shoulder bears against an internal shoulder d³ on the tubecZ at the outer extremity of the shell d² thereof.

e indicates a porcelain or other non - con- 55 ducting cap, which is set in the chamber a³, and against which the pressure of the nuts c' is exerted, the rod c passing through the cap e.

f and / indicate gaskets, of yielding nonconducting material,set between thecapeand 60 the plug a and between the exterior flange d' and the cap to keep the parts properly spaced and to prevent the unyielding pressure of the nuts on the porcelain or other frangible parts. 65

When the nuts c' are screwed up tightly, the collar or shoulder c² on the rod c is forced against the shoulder d³ of the tube d and this tube is drawn firmly outward, thus pressing its exterior shoulder d' against the gasket/ 70 and through the medium of this gasket against the inner wall of the chamber a² in the plug a. By means of the shell d² an annular barrier is formed completely around that part of the sparking point c which is exposed to the 75 sooty accumulation within the cylinder, this shell lyingin the chambera² and being spaced from the walls thereof and from the sides of the sparking point c and leaving only the extremity of said sparking point exposed, so 80 that it may have the proper coaction with the sparking point a'. It will therefore be seen that in order that the electric current may pass between the contact-points in any other manner than in the way in which it is in- 85 tended this current will have to move along the outer side of the shell d² and thence over the edge and inward along the inner side of the shell to the collar or enlargement c². This makes a long path, and owing to such length 90 and to the poor conducting qualities of the soot the above-mentioned short circuit is prevented. ’Were it not for this shell, arranged in the manner explained, the current could pass readily from the Avails of the chambera² 95 across to the rod c, and short-circuiting would therefore be of frequent occurrence. It is this disadvantage that my invention overcomes.

Various changes in the form and details of 100 my invention maybe resorted to at will without departing from the spirit thereof. Hence

To all whom it may concern: J

Be it known that I, Charles A. Mezger, a I citizen of the United States, and a resident of the city of New York, borough of Brooklyn, 5 inthe county of Kings and State of New York, have invented a new and Improved Sparking Plug, of which the following is a full, clear, and exact description.

The object of this invention is to prevent io sooty formations within the cylinder of an internal-combustion engine from accumulating around the sparking points in such a manner as to short-circuit the igniter.

This specification is an exact description of 15 one example of my invention, while the claims define the actual scope thereof.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indi20 cate corresponding parts in all the views.

Figure 1 is an exterior view of the sparking plug. Fig. 2 is a longitudinal section thereof. Fig. 3 is a section on the line 3 3 of Fig. 2, and Fig. 4 is a section on the line 4 4 25 of Fig. 2.

a indicates the plug proper, which is formed of metal and screwed or otherwise fastened into the walls &amp; of the cylinder, as will be understood.

a’ indicates one of the sparking points, which point is carried by the plug a within the cylinder. The other sparking point is formed by a rod c, of suitable material, having nuts c' at its outer end for the connection of the wire thereto. In the inner part of the' plug a is formed a chamber a², communicating with the cylinder, and in the outer part is formed a chamber a³, opening at the outer end of the plug. These chambers are con40 nected by a reduced central passage a'¹. Through the passage a‘^l extends a tube d, of hard insulating material, the tube having an annular shoulder d¹,bearing against the inner end ivall of the chamber a². Beyond the shoul45 der d' the insulating - tube d is extended to form a tubular shell d²,which extends through the chamber d\ slightly inward beyond the same. The rod c passes through the tube d and through the tubular shell dd thereof and 50 projects inward beyond this shell opposite the sparking point a'. On the rod c is formed an

700,147

I consider myself entitled to all forms of the invention as may lie within the intent of my claims.