CA1074643A - Dual internal electric spark plug - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE
This spark plug consists primarily of a metal body, having insulator means, in which is secured a pair of spaced apart electrodes, which will engage, each, high tension wires of an internal combustion engine's ignition system. On the opposite end of the spark plug, the electrodes are terminated, and extend from an insulator portion, so as to provide spark gap means between a pair of ground anvils, which are spaced apart from an inner insulator shield.

Description

~>7~ 3 This invention relates to ignition devices, and more particularly to a dual internal electric spark plug.
Dual gap spark plugs have been known in the art. These plugs however were of simple design providing elementary gaps for simultaneous non~independent ignition. In this way they provided greater reliability in that should one gap "foul", the other would provide ignition for continued combustion within that cy-linder although at some reduction in efficiency.
It is, thereEore, the principal object of this invention to provide an improved spark plug for the ignition system of internal combustion engines.
~- Another object of this invention is to provide a spark plug which will be of such structure, so as to be adaptable to fit the existing single hole of an engine cylinder, while providing a means of delivering two high voltage sparks in-dependently of each other, for igniting the compressed fuel and air mixture within the cylinder.
A further object of this invention is to provide a spark plug of the type described, which may utilize one high voltage ignition system for producing a spark at both gaps of the plug, or it may be adaptable for use with a dual high voltage ignition system.
A further object of this invention is to provide a spark plug of the type described, which will substantially increasethe volumetric efficiency of an internal combustion engine, while simultaneously decreasing air pollution from the engine exhaust.
Other objects of the invention are to provide a dual internal electric spark plug~ which is simple in design, inexpensive to manufacture, rugged in constructions, easy to use and efficient in operation.
; These and other objects will be readily evident upon a study of the following specification, and the accompanying drawings, wherein:
FIGURE 1 is a vertical view of the present invention, shown in elevation;
and FIGURE 2 is a fragmentary bottom plan view of Figure 1.
According to this invention, a spark plug 10 is shown to include a cyl-indrical metal casing 11, having a conventional cap nut lla, and an externally threaded barrel 12, tor being received in the conventional spark plug opening of a cylinder in an internal combustion engine. Secured ' ) ~i~

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on the interior of spark plug 10 is a cylindrical insulator 13, which extends above the cap nut lla, and is provided with an annular ridge 14, from which extends and protects, in a spaced apart relationship, insulator portions 15. Extending from the portions 15, are electrodes 16 and 17, for receiving the high voltage wires of the ignition system of the engine.
Electrodes 16 and 17 extend, and are insulated from each other, within plug 10, and are terminated by electrode tips 16a and 17a, which project from insulator 18. The spaced apart electrode tips 16a and 17a are spaced apart, and have disposed therebetween, a projecting inner insulator shield 19, which is disposed between the ends of ground anvils 20 and 21. The space, between the respective electrode tips 16a, 17a and the ground anvils 20 and 21, is the spark gap, across which the high voltage arc will take place, when the spark plug 10 is in use.
It shall be noted, that spark plug 10 is adaptable for either high performance engines or standard engines.
W~lile various changes may be made in the detail construction, it is understood that such changes will be within the spirit and scope of the present invention as is defined by the appended claims.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A dual internal electric spark plug, comprising a metal casing with a threaded barrel, a pair of spaced apart and insulated electrodes secured within said casing, an insulated shield secured within said barrel, a pair of electrode tips extending from said plug, and a pair of ground anvils extending from said plug for providing dual arcing of electric voltage, simultaneously within an engine cylinder, wherein the insulator for said electrodes is secured within said metal casing and extends therefrom and is terminated at one end by spaced apart portions, the spaced apart portions being secured fixedly to said elec-trodes which are insulated within the body of said insulator extending from the cap nut portion of said spark plug, each of said electrodes extending from said projections removably receives, each, a high voltage wire from the ignition systems of said engine; and wherein said electrodes extend and project from an insulator portion extending from said threaded barrel, and said pair of ground anvils are of L-shaped configuration, and are fixedly secured to said barrel in an oppositely opposed fashion, and said insulator projecting from said threaded barrel includes an integral and extending shield disposed between the spaced apart ground anvils and the said projecting electrode tips.