US1356304A - Spark-plug - Google Patents

Description

in I

H. A. MYERS.

SPARK PLUG.

APPLICATION FILED APR. 14, 1919.

Patented Oct. 19, 1920.

UNITED STATES PATENT OFFICE.

HUBERT A. MYERS, OF TOLEDO, OHIO, ASSIG-NOR TO THE MYERS SPARK PLUG (70., OF TOLEDO, OHIO, A CORPORATION OF OHIO.

SPARK-PLUG.

Specification of Letters Patent.

Patented Oct. 19, 1920.

Application filed April 14, 1919. Serial No. 289,984.

To all whom it may concern:

Be it known that I, HUBERT A. MYERS, a citizen of the United States of America, and a resident of Toledo, Ohio, have invented a certain new and useful Improvement in Spark-Plugs, of which the following is a specification.

This invention relates to self-cleaning spark plugs of the kind shown and described in my prior Patent No. 1,268,380 and contemplates an improvement thereon.

The object of the invention is to provide a construction which will result in a more effective action of the cleaning balls which are inclosed loosely in the plug.

To these and other useful ends the invention consists in matters hereinafter set forth and claimed. 1

In the accompanying drawings- Figure 1 is a side elevation of a spark plug embodying the principles of the invention, showing the lower portion thereof in vertical section.

Fig. 2 is a horizontal section on line 22 in Fig. 1.

As thus illustrated, the invention comprises an insulator 1 of porcelain or ,other material, having an enlarged lower end 2 forming a shoulder 3 extending around the lower-portion of the insulator. The insulator is held in the casing or outer metal portions 4 and 5 in any suitable or ordinary manner. The sleeve portion 6 of the plug is threaded externally, in the usual manner, and has an internal shoulder 7 which is opposite the other shoulder 3, the space 8 being formed above said shoulders. A restricted inlet 9 is formed around the lower end of said space 8, thereby to admit the pressure. The balls 10 are disposed in said space and normally rest upon said shoulders. These balls may be made of porcelain or other insulating material, and are preferably formed with rough surfaces. The electrodes 11 and 12 are mounted and arranged in the usual manner.

When the explosions occur in the cylinder of the engine, the pressure enters through the inlet 9 and blows the balls 10 upward. It will be seen that this inlet is a little outside of the center of each ball, so that the pressure acts on the outer side of each ball. This causes the balls to roll upwardly upon the sides of the insulator, thereby removing the carbon from the surfaces of the space in which they are inclosed. The balls can also, of course, roll around in various directions, thus keeping the interior of the plug clean.

hat I claim as my invention is l. A spark plug comprising an insulator having an enlarged lower end portion forming a shoulder, with space around that portion of the insulator above the shoulder, and a plurality of loose elements adapted to move around in said space, which elements normally rest upon said shoulder, the plug having a restricted inlet extending around the edge of said shoulder to admit the pressure against the lower sides of said elements.

2. A spark plug as specified in claim 1, said plug having a sleeve extending over said insulator and formed internally with a shoulder opposite the shoulder on the insulator, so that said elements normally rest on both of said shoulders.

3. A spark plug as specified in claim 1, said elements being balls which roll up and down and around the insulator, and said inlet being located outside of the center of each ball, whereby the pressure acts on the outer side of each ball.

HUBERT A. MYERS.

Images