US1154117A - Spark-plug. - Google Patents

Description

AMOS N. HOAGLAND, OF OXFORD, NEW JERSEY.

SPARK-rites.

Specification of Letters Patent.

Patented Sept. 21, 1915.

Application filed August 2, 1911. Serial No. 641,905.

To all whom it may concern Be it known that I, AMos N. HOAGLAND, a

- citizen of the United States, and a resident ments and combinations hereinafter of Oxford, county of Warren, and State of New J ersey, have invented a certain new and useful Improvement in Spark-Plugs, of which the following is a specification. I

My invention relates to spark plugs wh ch are adapted for the ignition of explosive charges in hydro-carbon engines.

Among the objects of my invention are the provision of a spark plug with multiple sparking points; the provision of a spark plug in which the point or points are readily movable and removable and replaceable, the provision of a spark plug which is not readily fouled and in which the insulation and inner conductor is protected from fouling by the means carrying the sparking points, and the provision of a spark plug in which the distance between the points is adjustable to control the length of the spark gap by positive adjusting means without the necessity of resort-ing to bending of parts or deformation of any character.

Other objects of my invention will ap pear in the course of the following specification and claims.

WVith these and related objects in view, my invention consists in the parts, improveset forth and claimed. 1

\Vhile I have illustrated and shall describ the preferred embodiment of my invention, it will, of course, be understood that my invention is not limited to the specific form illustrated and described, but is as broad as my claim.

In the accompanying drawings in which the same numerals of reference are uniformly used to designate the same parts throughout, Figure 1 is avertical, central, cross-sectional View of a spark plug embodying the preferred form of my invention, and Fig. 2 is a similar fragmentary View of a modification.

Reference numeral 1 designates .the outer shell of the spark plug. This shell may be of any known form. In the illustration I have shown it as having a threaded portion 2 adapted to be screwed into a threaded opening in the engine cylinder, and a squared or hexagonal portion 3 to which a wrench or other tool can be applied. In the form shown a shoulder 4 is formed between the screw-threaded and the squared or hexagonal portion, but as already stated, this shell may be of any preferred and usual form,- according to the form and construction of the cylinder in which it is to be used.

Reference numeral 5 designates the insulating means which is preferably of orcelain, but, of course, any equivalent insulator may be substituted for the porcelain. The insulator 5 is provided with an enlarged portion 6 between its ends, which is received fairly snugly within the opening 7 in the shell 1, and rests on the shoulder 8 in said shell. The insulator is held in place in the shell by means of the retaining nut 9 which, is apertured at 10 to permit the passage of the insulator, and is provided with an exterior screw thread by means of which it is screwed within the interiorly threaded opening 7 of the shell 1. Suitable packing 11 is supplied at each end of the enlargement 6 of the insulator 5 in order to make the spark plug gas tight. The insulator 5 is provided with an axial perforation 12, which perforation is enlarged at its lower end to form the recess 13. Through this longitudinal perforation in the insulator is passed the stem 14: of conducting material. Near its lower end, this stem, which is preferably threaded substantially throughout its length, is enlarged at 15 to an extent nearly but not quite suilioient to close the end of the recess 13, thus making a substantially dead air space within the interior of the recess 13, retarding and preventing deposit of carbon therein, and greatly lessening the liability of the plug to become fouled and short circuited. The removable point carrying member 17 may be secured against the shoulder 16 pro vided at the lower end of enlargement;l5. This point-carrying member 17 is preferably provided with a central screw-threaded opening so that it may be screwed on the stem lit to abut against the shoulder 16, and may be firmly secured in. place by means of the lock nut 18. It is not essential, of course, that the point-carrying member 17 be threaded and screwed on the stem 14, it bea deflection of the with it. 1

Nut '20 is screw-threaded on the stem 1t above the shoulder 15, and is received within the recess 13 in the insulator 5, and abuts against the inner extremity thereof, thus providing means of adjustment of thestem .14: and the spark point-bearing member 17 "which is attached thereto with reference to the' shell 1 of the plug.

I A nut 21 is pro- 'vided for securing the outer end of the stem 14 to the insulator 5, and an additional nut 22 is' 'provided for the purpose of making the requisite electrical connection. 1 If it is desired to adjust the plug so as to increase or decrease the length of the spark gap, this result may be secured by loosening nuts 22 and 21 and rotating the threaded stem 14 with respect to the nut 20 in which manner the points 19 may be made tov approach or recede from the end of the shell 1. W hen it is desired to replace the spark-points the nut 18 and spark point carrying member 17 (if the latter is screwthreaded on the stem) are unscrewed from the stem 14: and the point-bearing member ducting material, and having a central 1011-.

gitudinal aperture, an insulatorwithin the aperture in the saidshell, said insulator being provided with a longitudinal aperture enlarged at its inner end, a stem passing through the aperture in said insulator, and a nut on the said stem fitting Within the enlargement or said aperture, said stem being enlarged beyond the said nut to substantially close the aperture in the insulater, a shoulder on said stem, and a point bearing member carrying a plurality of spark points removably secured to said stem and. abutting against said shoulder, substantially asset forth.

This specification signed and witnessed this 31st day of July, 1911.

AMOS N. HOAGLAND. i/Vitnesses ROBERT S. ALLEN, Enw. J. GEORGE.

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