US961136A - Spark-plug. - Google Patents

Description

R. JAKE.

SPARK PLUG. APP LIOATION FIL ED JUNE 9, 1909. RENEWED APR. 21, 1910. 961,136. Patented June 14,1910.

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SIARK-PLUG.

Specification of Letters Patent,

Patented June 14,1910.

Application filed ham a, 1900, Serial No. 501,039. v Renewed April 21, 1910. Serial no. 556,848.

herebvdeclare the following to be a full,

clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. r

This invention relates to spark plugs such as are used in connection with internal combustion engines. 'It is a well known fact] that the sparking terminals of plugs of this character are extremely apt to become unfastened after a short period of use by reason of the deposition on the sparkin surface of an accumulation of soot and Oll. It is also well understood that sparking tenninals in plugs of this character are apt to f pit under the influence of the electric discharge with the consequence that the sur face is roughened and the deposits that accumulate are rendered difli'cult to remove.

The principal object of the present invention is to provide an improved form of spark plug which shall have a form ofspar'king terminal not adapted to receive and retam theseaccumulations and which will not i 3 pit -1 7 With the above and other objects in view the invention consists of a spark plug having an improved form of body together with improved terminals carriedthereby.

The inventionfurtherconsists in certain novel details 'of construction and combina; tions of parts hereinafter fully described,

and specifically set forth in the. claims.

In the'accompanyi drawings, like characters of reference indicate like parts in the several views, and :,Figure 1 is a vertical section of a spark cordance with this I enlarged detail view of the sparking termiplug constructed in acnals.

The plug body comprises a threaded pertion 10 adapted to be screwed into the wall of an explosiveengine cylinder and this threaded portion is provided with the usual nut 11 so that it may be screwed firmly in by means of a suitable wrench: Extending from the threaded portion 10 is a body 12 and upon the lowerend of this body is a invention. Fig. 2 is'an' minal 18 and the insulation thereof is indicated at 19 and is provided with a collar '20 1 which prevents the terminal being inserted too far in the body by reason of this collar bearing against the shoulder forined between the opening 16 and enlarged portion 17 Screwed over the enlarged portion 17' is a packing gland 21 andbetween the upper end of this packing gland and the collar 20 is suitable elastic packing 22. The insulation cap 23 the cap being means of suitable threads formed on said terminal and in an opening in the cap. A binding screw 24 is held on the terminal beyond the cap so that a wire may be retained between the cap and binding screw. The lower end of this terminal is squared so that the end is formed by a plane perpendicplar to. the axis of the terminal. Within-the threaded opening 15 is screwed aterminal 25 provided with a cup shaped'depression 26 in the face proximal theterminali-l8 and this terminal 25 is further provided with a suitable screw driver receiving slotor the like as indicated at 27 this being for the purpose of adjusting the distance between the opposed terminals. The relative sizes of the terminals 18 and 25 is such thatithe cup shaped depression in the latter will be as large, or

slightly larger than the end vof the ter- .minal 18.

In the operation of this plug when a spark passes from one terminal'to the other it jumps from. the edge of the squared ofi terminal .to the rimof the cup and as this rim or edge becomes slightly worn the length of the gap will be increasedand the spark will move around to a fresh position thus traveling continuously around the terminals and never continuing long enough in one position to pit the terminals Further- '19 is reduced at the upper end and on this more, it is experimentally found that with.

this construction the deposition of soot on the terminals is practically obviated and that an extremely fat and eflicient spark .is obtained. I

There has thus been rovided a simple and eflicient device of the ind described and for the purpose specified.

Having thus described the invention, what is claimed as new, is

1. In a spark plug, a'bodyprovided with an opening therethrough, an integral yoke on said body provided with a threaded sparking terminal opening, a sparking ter minal fixedly held in .the body, and a threaded sparking terminal held in the threaded opening and tprovided with mdans to engage a tool, one 0 said terminals being provided with a cup shaped end. 7

2. In a spark plug,-a body provided with an opening therethrough, an integral yoke on said body provided with a threaded sparking terminal opening, a sparking terminal fixedly held in the body, and a threaded sparking terminal held'in the threaded opening an provided with means to engage a tool, one of said terminals being provided sparking terminal opening,

with a cup shaped end and the other ter-- minal having an end cut at right angles to the body.

3. In a spark plug, a body provided with an opening therethrough, an integral yoke on said body provided with a threaded a sparking terminal fixedly held in the body, and a threaded sparking terminal held 111 the threaded opening and provided with means to engage a tool, one of said terminals being provided with a cup shaped end and the other terminal having an end cut at right angles to the body,- the cup shaped end being of grgater diameter than the o posed terminal en In testimony whereof, I afii'x my signature, in presence of two witnesses;

ROBERT JAKE. Witnesses:

CHARLES PETERS, J. S. COWLEY.

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