US1362300A - Spark-plug - Google Patents

Description

T. E. HALL.

- SPARK PLUG. APPLicATmN FILED 0cT.H,1919.

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THOMAS E. HALL, OF OTTUMWA, IOT/VA.

SPARK-PLUG.

Application filed October 11, 1919. Serial No. 330,040.

T 0 all whom, 'it may concern.'

Be it known that l. rfi-lonas E. HALL, a citizen of the United States, residing at Ottumwa` in the county et' lVapello and State ot' lowa, have invented certain new and useful Improvements in Spark-Plugs, of which the 'following is a specification.

This invention relates to iniprovements in spark plugs especially adapted tor use on internal combustion engines.

An important object ot' this invention is to provide. a spark plug having novel means t'or intensifying the spark at. the sparking' point ot the plug whereby, the :ucumulation ot' carbon is reduced in the 'cylinders of the motor and the tuel consumption also reduced. r

A further object is to provide a spark plug having a sectional insulator adapted to .withstand a maximum ot strain due to vibration, etc., whereby breakage ot' the plug is reduced to a minimum.

A 't'urther object is to provide a spark plug having an insulator t'ormcd ot a pair of sections and novel meansl to space the sections whereby the several parts o'll the spark plug are rendered Vt'rce to expand under the. influence ol'l heat without causing a leakage in the plug.

A further object ot the invention vis to provide a spark plug ot the character described which is efficient. ot highly simplified construction, and cheap to mamit'acture.

Other objects and advantages oli the invention will be. apparent during the course ot the following description.

ln the aceoml'niuying drawing vtoi-ming a part of this al'iplication and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a vertical section through a spark plug embodying the invention.

Fig. l is a. Vertical section through a moditied l'orin ot' insulator.

Fig. 3 a perspective of a spacing element en'ibodied in the invention` Fig. 4 is a plan view ot' the lower insuA lator section illustrated in Fig. 2. i

In the drawing wherein Ytor the purpose of illustration is shown several preferred embodiments ot the invention. the numeral 5 designates the shell o'l a` spark plug having the yusual exterior screw threads (i adapted to engage the screw threads ot' the spark plug opening in an internal combusannular shoulder tion engine cylinder. An

5 and is adapted '7 is iormed on the shell t'or forcing a gasket into gas-tight engagement with the. upper side otl the. cylinder to which the spark plug is applied as is eustoiuary in spark plugs of standard construction. rThe upper portion of the shell 5 is provided with polygonal sides 8 adapted to be engaged by a wreneh 'for applying the plug.

'vl`he invention includes upper and lower insulator sections Sl and l() respectively, which are retained in spaced relation by a spacing element 11 ot' insulating' material.

Gaskets 12 and 12% surround the sections ol the insulator and engage annular shoulders 1l and 15 formed on the same. The

with the gasket 1;) `t'or preventing the leakage ot compression through the plug is mounted on an annular shoulder 16 formed in the interior ot' the shell. A locking nut 1T is adapted to secure the. sections 9 and 1t) ot the insulator in position and is also adapted to torce the gaskets into gas tight engagement with the inner wall ot' the shell. A\s illustrated in Fig. l. the sides of the annular shoulder '1l and 15 in contact with the gaskets are inclined by Jforcing the gaskets tightly' into engagement with the inner side w-all of the shell.

conductor 1S is extended centrally through lthe upper insulator section 9 and hasl its upper end portion screw threaded tor engagen-ient with a binding post 19 ywhich is adapted Vl'or connection with one terminal ot a tced wire.

"l`he lower end portion ot' the upper conductor 1H extends beyond the insulator 9 and is pointed as indicated at Qt). The pointed extension 2l) of the lower end of the conductor 1h is received within a Cen trally arranged opening Q1 in the annular spacing clement 11 and is arranged up- \vardl \v trom the upper terminal of a second conductor 2Q. As illustrated in Fig. 1, the conductor 2Q is in the. t'orm ot1 a wire cable constructtal ot' a plurality ol twisted strands ot tine copper wire. The, upper .end portion ot' the cable Z2 terminates flush with the upper end ot' the lower insulator 10 for toi-ming a-spark gap between the pointed extension 20 and the upper conductor 18. rl`he spark gap thus termed between the adsol aol

nso

rent to jump the same in order to reach the firing point of the plug. The .spark gap thus formed intensities the spark at the sparking points and thereby causes the spark to completely ignite the charge of gas Within the cylinder. The lower end portion of the cable 22 terminates flush with the lower end of the insulator l() and is arranged in spaced relation to a pair of stationary electrodes 23. The stationary electrodes are curved downwardly and up- Wardly toward the end of the cable 22,

whereby an efficient spark point is provided between the cable 22 and the electrodes.

In the form of the invention illustrated in Figs. 2 and 4, the upper insulator 24 1s provided with a centrally arranged conductor 25 having its lower end portion extended beyond the adjacent end ot' the insulator and split to provide four sparking points 26. The lower insulator 27 is provided with a plurality of spaced parallel conductors 28 arranged in spaced relation to the split sections 26 of the upper conductor 25. The upper and lower ends of the conductors 28 which are of copper wire terminate flush with the upper and` lower ends ot' the insulators for preventing the bending ot' the .end portions of the same. as a result oi' their In assembling the form ot' the lightless. inventlon illustrated in Figs. 2 and 4, the insulator 27 is first arranged Within the shell `and the spacing element is subsequently placed upon the same. The upper insulator 24- is now mounted upon the spacing element l1. and the split sections 26 ot the conductor 25 are thereby arranged in spaced relation to the'upper ends of the condurtors 2S.

- As illustrated in Fig. 3, the spacing element ll is formed of a plurality ot built up annular layers of mica some of which may be removed for spacing the ends of the conductors the desired distance.

'l The spacing element l1 permits of the expansion of the several elements of the plug upon being heated without the possibility ot' leakage of compression. Further in forming the insulator in two sections, the same are less liable to break as the result of eX- eessive 'heatand are also enabled to Withstand strain and vibration during use.

It is to be understood that the form ot the invention herewith shown and described is to be taken as a preferred embodiment of thesame and that such minor changes in arrangement and the construction of pfuts may be made as will remain withir the yspirit ot' the invention and the scope oir what is claimed.

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

l. A spark plug including a shell, upper and lower insulators arranged within the shell, a conductor carried by said upper insulator and having its lower end portion eX tended beyond the lower end ot the upper v sparking points ot said iirst named conduc. tol.

and an electrode carried by the lower of said shell.

2. A spark plug comprising a shell, upper and lower insulators arranged within said shell. a conductor extending centrally through said upper insulator and having its lower end portion extended beyond the lower end of the upper insulator and formed with a plurality ot' outwardly diverging sparking points` a plurality of spaced par allel conductors extending through said lower insulator and arranged in rectangular formation, the upper ends of said spaced parallel conductors being iiush with the upper end ot' the lower insulator 'and arranged directly beneath the outwardly diverging sparking points of said first named conductor, an electrode carried by said shell, and means spacing the upper and lower insulator sections.

In testimony whereof I affix my signature.

THOMAS E. HALL. [1.. s]

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