US1525411A - Spark plug - Google Patents

Description

- SPARK PLUG Filed Feb. 16, 1923 INVENTOR LLOYD PHCE Fatented Feb. 3, 1925.

UNITED STATES LLOYD PAGE, OF INDIANAPOLIS, INDIANA.

SPARK PLUG.

Application filed February 16, 1923. Serial No. 619,485.

To all whom it may concern:

Be it known that I, LLOYD PACE, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented new and useful Improvements in Spark Plugs, of which the following is a specification.

This invention relates to spark plugs and the prime feature of the invention is the provision of means for confining a quantity of explosive medium within a chamber at the lower end of the spark plug, providing a limited opening for the entrance and escape of the propelling medium and arranging the ends of the positive. and negative electrodes whereby they will lie more or less in the path of travel of the propelling medium as it enters or leaves the chamber.

A further feature of the invention is in so arranging the cover for the lower end of the chamber that an intense heat will be maintained in the spark plug chamber which will result in maintaining the plug in dry state, removing any oil that may be drawn into the cylinder and providing a more perfect and intense spark.

Other objects and advantages will be hereinafter more fully set forth and pointed out in the accompanying specification.

In the accompanying drawings which are made a part of this application,

Figure 1 is a side elevation of a spark plug with parts broken out.

Fig. 2 is a bottom plan view of the spark plug.

Fig. 3 is a perspective view of a cover plate for the lower end of the plug, and

Figs. 4 and 5 are views showing a slightly different arrangement of the free ends of the negative and positive electrodes with respect to the opening through the closure at the inner end of the spark plug.

Referring to the drawings, 1 indicates the shell of the spark plug which is of the usual or any preferred form and having a chamber 2 in the lower portion thereof into which extends the lower end of the core or porcelain carrying the positive electrode 4.

Positioned over and forming a closure for the lower end of the chamber 2 is a. closure plate 5, which may be constructed of brass, porcelain or other suitable material, said plate having an opening 6 therethrough which is slightly larger in diameter than the diameter of the electrode 4 to provide a limited passage around the electrode for the propelling medium. In addition to the electrode 4:, a negative electrode 7 is connected to the shell 1 and preferably interiorly of the chamber 2, as shown in Fig. 1, or it may be placed exteriorly of the shell as indicated at 10 in Figs. 4 and 5, the main requirement being the termination of both electrodes sub stantially in the path of the propelling or explosive medium as it enters or is expelled from the chamber 2. lVhen the negative electrode is positioned as shown in Figure 1 of the drawing, it is necessary to provide anotch in the edge of the opening 6 through which the free end of the negative electrode extends, the limited diameter of the opening 6 being such that both electrodes could not pass therethrough without providing the notch.

With this construction, the gases or explosive medium will have a wiping effect on the ends of the electrodes for removing any carbon or other sediment that might collect on the electrodes, the force of the exploding medium within the chamber 2 acting to remove such sediment as may collect, thereby keeping the electrodes clean and providing a stronger and more perfect spark.

The plate 5 is preferably made separate from the shell 1, although it may be made integral with the shell. When the plate is made separate from the shell as shown, it is attached to the shell in any preferred manner as by means of screws 8, a Washer 9 being preferably introduced between the end of the shell and the closure plate.

It will likewise be seen that, due to the intense heat caused by the explosion of the propelling medium within the chamber 2, any oil coming in contact with the plug will be consumed, consequently the electrodes will not become fouled with the oil to such an extent as to influence the proper firing of the electrodes.

l/Vhat I claim is:

1. In a spark plug, a shell having a chamber in one end thereof, a flat disc-like closure plate for the open end of said chamher, a washer between said plate and edge of the shell, screws passing through said plate and washer and into said shell for removably attaching said plate and washer to said shell, said plate having an opening therethrough, a positive electrode having its free end extending into said opening, and a negative electrodehaving its free end in cooperative relation with said positive electrode, the free ends of said electrodes registering, With the opening through tlheplate'.

2. In a spark plug, a shell having a chamher in one end thereof, a flat disc-like clo- 'sure plate for the open end of said chamber,

screws for removaloly attaching said plate to said shell, said plate having an opening therethrough and a notch inoneedgeof the opening, a positive electrode having its freeend extending into said opening and a 1 negative electrode having-its free end extending into said notch and in cooperative relation with said positive electrode, the free ends of said electrodes registering with the opening through the plate.

In testimony whereof 1 hereto afiix 111:,

LLOYD PAGE.

; signature.

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