US1970525A - Spark plug - Google Patents

Description

w. E. LYONS Aug. 14, 1934.

SPARK PLUG Filed Sept. 8, 1933 i atentecl Aug. 14, 1934 UNITED STATES SPARK PLUG Willard E. Lyons, Chicago, Ill., assignor to Hart S. Harned, Oak Park, Ill.

Application September 8, 1933, Serial No. 688,592

8 Claims. (Cl. 123-169) improve the appearance and increase the attractiveness thereof.

To the attainment of these ends and the accomplishment of other new'and useful objects as will appear, the invention consists in the features of novelty in substantiallythe construction, combination and arrangement of the several parts hereinafter more fully described and claimed and shown in the accompanying drawing illustrating this invention, and in which Figure 1 is an elevation of aplug of this character constructed in accordance with the principles of this invention.

Figure 2 is a detail sectional view on an enlarged scale, and as taken on line 22, Figure 1.

Figure 3 is a view similar to Figure 2, showing some of the associated parts of the plug separated.

Figure 4 is a top plan view of Figure 2, with the binding nutomitted.

Referring more particularly to the drawing the numeral 10 designates the usual shell of a spark plug provided with exterior threads 11' adjacent one end thereof. l

The numeral 12 designates the core of in- 35 sulating material, such as porcelain or glass which is securedin the shell '10 in the usual manner, such as by means of the gland 13.

e The core 12 1s provided with a centrally disposed opening 14 therethrough and inwhich opening is arranged the central conductor 15,

whichprojects for a substantial distance-below the coreto-form one of the electrodes of the spark gap at the inner end of the plug.

This conductor 15 is held in position by means lof a stem 16 provided with exterior threads 17 so as to be threaded into the end of the core 12.

The conductor 15 is secured to the stem 16 in,

The numeral 20 designates a member which is constructed of a phenolic condensation prodnot, commonly known as bakelite, and the upper end of the stem 16 is threaded into the member 20. The member 20 may be provided with a recess 21 in its lowerface, and into which recess the flange 18 projects, there being projections 22 extending above the upper surface of this flange, which are seated in the body portion of the member 20 to hold the member 20 against rotation with respect to the core 12, and any number'of projections 22 may be provided.

The member 20 is preferably of a diameter substantially equal to the diameter'of the adjacent portion of the core 12.

The stem 16 together with the flange 18 are constructed of any suitable metal to form a continuation of the central conductor 15;

A second stem 23 constructed of any suitable metal and similar in construction to the stem 16,

is provided with exterior threads 24, which are threaded into'the upper end of the member 20,- The stem 231s provided with a flange 25 extend-' ing therearound and of any desired diameter, but is of a diameter considerably less than the exterior diameter of the member 20. Projections 26 are'provided on the lower face of the flange 25 which are adapted to be seated in recesses in the upper end of the member 20 so as to hold the member 20 and the stem 23 against relative rotation.

The inner end, 27 of the stem 23 may be reduced in diameter as desired and when in position and when the flange 25 rests upon the top 0 of the member 20, the extremity 27 of the stem 23 willterminate short of the extremity 19-of the stem 16 to form an air gap 23 therebetween,

and the length of the gap is determined by the spacebetween the proximate extremities of the stems 16;and 23. 3 V I A clamp or binding nut 29 may be threaded on to the stem 23 and serves as a means for securing the high tension cable to the plug.

With this construction it will be manifest that a very simple arrangement will be provided and by reason of the employment of the member 20 constructed of a phenolic condensation product, it is possible to color the member with any suitable coloring matter and thereby not only produce a contrast between the core 12 and the member 20, but provide a rigid and strong construction.

At the same time the parts are so arranged that they may be readily assembled and the cost of production will be materially reduced.

Furthermore, the member 20 will be a solid construction provided only with an opening for 5 receiving the ends of the stems 16 and 23, and the formation of the air gap 28, with the result that a very strong and substantial construction will be produced.

While the preferredform of the invention has been herein shown and described, it is to be understood that various changes may be made in the details of construction and in the com; bination and arrangement of the several parts, within the scope of the claims, without departing; from the spirit of this invention.

What is claimed as newisf g 1. A spark plug embodying an insulating core, an insulating member ofsubstantiahthickness supported by the end of the core, a central conductor passing through the core and "are said member, a

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wi h a en. sa th n the a d. mem er a eis e e sins ea n m ans; betw n he em e and a h o aid eqmiu tcr and. t r. o kns: he. co d c p a d tem else-in t. 10+; tation with respect m said member.

2 A, spark plug embodying an insulating core, Q,,a member constructed of a phenolic condensa;

ime pr du t upp r edby the end of t eicore. c n r conducto p ssin rough h core and into said member, a centrally disposed. stem assin n thesaidmember andtermi a ing p t i he xtr m t if-s id ondu e to. f rm therewith a spark gapwithin the said member, n nt rchan n me n between i m mber 491. a dste an cQnduc o for oc i a d. member, te an ,cqnduc pr a a st e ati e. tp ov men i mbqqrie aninsul tine cor-a tru d. q ce. h no ic e ndensei n were central conductor stem passing through the core aif- 4 of he extremity of said conductor stem to 5%:rthe mfatej faces of the core and said member, one of the contacting faces'being" provided'with aprojection. and the other with a recess receiving the projection t maintain. the member and core ag'a t'relativerbtation, h f A spark plug embodying an insulating'core', a merri-ber constructed of a phenolic condensati'on product supported by the end of the core, a central conductor passing through the core 15- and into saidmember, a centrally disposed" stem into the said member and terminating short of the extremity of said conductor to se a ate. he tre f. the c re a.

i fiet a a i al lyl ismalstem. the said member, and terminating therew th? afs'park gap 'within the ari me berfafflange on one oflsaid stems, extending q 'ndan'd projecting 'b ween the proxiform therewith a spark gap within the said member, a circumferential flange on the stem and conductor intermediate the extremities thereof, said flanges contacting opposite faces of said member, and locking means between the flanges and the adjacent faces of said member for maintaining the member and stems against relative rotation.

5. In a spark plug, a structure providing a threaded stem and a circumferential flange intermediate the extremities thereof, in combination with a core and a member mounted upon the end of the core, the ends of the stem being threaded into the core and the said member with said flange therebetween, the contacting faces of the flange and the said member being provided one with projections and the other with recesses into which: the projections extend to maintain. the parts against relative axial displacement.

6. In a spark plug, a, structure providing a threaded stemand a circumferential flange intermediate the extremities thereof, in. combination with a core of insulatingmaterial, and a capmember of considerable; and substantially uniform thickness having an opening therethrough, and stem threaded into the ends. of said opening with the proximate ends of thestems in alinement and terminating short of each other to form anair gap-therebetween and within said member. y

7. In a spark plug, a structure providing a threaded stem and a circumferential flange intermediate the extremities. thereof, in combination with a core of insulating material, a cap member of considerableand substantially uniform thickness having an opening therethrough, and stemsthreaded into the; ends of said-opening with the. proximate endsof the stems in alinement and terminating short of each other to form an air, gaptherebetween and w ithin said, member, said cap member; being formed of a phenolic condensation product. V

8.; In a spark plug, a structure providing a threaded stem and a circumferential flange intermediatethe extremities thereof, in combina tion with a core of insulating material, acap; member of considerable; and substantially uniform thickness having an openingtherethrough, stems threaded into the; ends 1 of saidopening withv he; xim e nds o he stems in s ine: ment and. terminating, short-,of; each other to form an air gap therebetween andwithin said; em e a. um e ntial flan e nt m d a the end of; each of saidstems; and contacting

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