US1729576A - Spark plug - Google Patents

Description

Sept. 24, 1929. H. M FULLER 1,729,576

SPARK PLUG Filed July 9,'A 1927 -l-Tfl wvwwm 7 l/ n H g. 6. F2 I r 9 5, m MINIMUM 6 In/manioc Wwd/mu.

Fetented Sept. Z4, l9219 unirse srares PATENT GIFFICE SPARK "SLUG Application filed July 9, 192'?. Serial No. 204,524.

lily invention relates to spark plugs and h for its object to provide a new and eiiieient spark plug which will have a more intense spark.

l further object is to provide a spark plug which will lire all oi the in the eombustion chamber of an internal combustion engine with a hotter spark than has heretofore been accomplished.

A still 'further object is to provide a spark plug which will be provided with additional spark gaps which increase the intensity of the spark in the iii-ing chamber.

A still further object is to provide a spark plug which will be provided with additional spark gaps within the core thereof and which will have a step-up eoil in the Core to intensity the spark.

These objects l accomplish with the device illustrated in t-he accompanying drawings in which similar numerals and letters ot reference indicate like parts throughout the several views and as described in the specification forming a part of this application and pointed out in the appended claims.

ln the drawings in which l have shown the best and most preferred manner of building my invention, Figure' l is a section oit a spark plug, showing the spark gap therein. Figure 2 is a view ot a double spark gap provided in a spark plug. Figure 3 is a view of tubular modification of Figure 2. Figure l is a lsection of a spark plug with a coil between the gap forming two equally spaced gaps between the ends o' the coil and the ends of the central wires ot the plug. Figure 5 is a side elevation of the coil. Figure 6 is an end view thereof. Figure 7 is a side elevation oit' the contact post.

This application is an improvement over my iii-st invention and patent oit January 18th, ,1927, Serial No. 66.723, Patent No. 1,614,951, dai-ed Jan. is, 1927.

ln the drawings l have shown the core of the ,spark plug as A, the metal casing as B, the retaining plug as C and the usual gaskets between the plug and easing. A eore A provided of suitable material, such as porcelain or other composition which will withstand heat and will insulate and has a eentrai taire theretlufough. @ne eed said bore l is enlarged, as at 2, and is internally threaded. An electrode wire 3, having a flange 4l near one end thereof, is then placed through the core l and the flange e holds the wire in the hole and prevents it from being pushed too tar through said hole and entirely closes and seals the hole. A threaded Contact post 5 is then provided, having a iange (i thereon and a larger threaded portion 7 on the opposite end thereof. The extreme end ol" the said portion 7 is constricted to form a small Contact post 8. The threads of the portion 7 are made to fit in the threaded portion in the enlarged bore 2 of the core A. l3etween the end 8 of the post 5 and the end of' the wire 3 I provide a coil of wire 9 which coil is or" large enough diameter to till the hole or bore 2 and so that when the wire 3 and the plug 5 are in place the ends of the coil 9 surround the extreme ends of the wire and plug so-that a spark in bridging the gap between them will ump to all sides alike as they are centered therearound.

Some modilieations of the device may be made as shown in the drawings and instead oit' using a coil 9, a solid plug l0 may be inserted between the wire 3 and the plug 5, as shown in Figure et. The inner end of the post 5 may also be extended longer and a spark gap be made between the ends of the port 5 and the wire 3, making a simple single gap therebetween, as shown in Figure 2.

Other modilications may be made, as shown in Figure 3, where a threaded cylindrical tube 1l is screwed into the core in place of the coil 9, thereby providing two spark gaps, the same as shown in Figure l, but with a. cylindrical tube to bridge the gap and to carry the current from the post 5 to the wire 3. The spark gap is then from the post 5, to the tube ll, te the wire 3 and the tiring gap is between the wire 3 and the common spark wire l2 on the metal casing B.

These slight modifications may be made in the invention without departing from the scope of the claims, the main invention being in the two sja-.rk gaps within the core of the t thereby intensifying the spark.

7`ing thus` described my inventifi, l lesi to re by '.letters Fateut and o'iaiu:

l. In a spark plug the combination of a porcelain core, having a longitudinal central bore therethrough with oneend of said bore of larger diameter than the other and with internal threads therein; a wire passed through said small bore; a flange on one end ol said wire adapted to prevent the wire from coming out of said bore; a contact post having one end larger than the other and threaded to t into said threaded portion of said bore; a coil of wire adapted to be placed within the larger diametercd bore of said core with the lower end entirely surrounding said wire but not touching it by contact, and with the top end of said coil entirely surrounding the contact post but not in contact therewith so that when placed the coil is spaced from said wire and said contact post making two spark gaps therebetween.

2. In a spark plug the combination of a metal casing adapted to hold a core therein; a core to it therein being centrally hored with two diametered holes in alignment therewith; a contact wire on said metal casing; a wire through the smaller bore of said core spaced from said, Contact wire; a coil carried in said bore of said core surround ing but not touchingsaid wire; a closure and contact post secured in the top end of said core with the lower end within the cirele of said eoil but not contacting therewith; and means to connect wires therewith.

In testimony whereof I have affixed my signature.

HARRY M. FULLER,

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