US1247102A - Spark-plug for internal-combustion engines. - Google Patents

Description

K. FoRBEsi- "SEARK PLUG FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED AUG23| 19l6.

Patented Nov. 20, 1.91?.

LQYJE.

KINGSTON FORBES KINGSTON FORBES, OF FLINT, MICHIGAN.

SPARK-PLUG FOR INTERNAL-COMBUSTION ENGINES.

' Specification of Letters Patent.

1,247,102., Patented Nov. 20, 191'?.

Application led August 23, 1916. Serial No. 116,515.

Michigan, have invented certain new and therein by any preferred means, the lower 60 useful Improvements in Spark-Plugs for end of said electrode projecting below the Internal-Combustion Engines, of which the lower end face of the plug. As thus far defollowing is a specification, reference being scribed, the spark plug is quite common in had to the 'accompanying drawings. the art, and has been generally adopted in This invention relates to an improved preference to the sectional spark plug which, 65 spark plug for internal combustion engines though it admits of better and more thorand has for its primary object to provide ough cleaning, yis impractical in use owing improved means for detachably connecting to the fact that it is almost/impossible to the outer electrode to the plug shell-so as to make the plug gas-tight. On the other hand,

afford ready access to the parts o f the plug a. plug of the latest improved type-having 70 for the purpose of removing carbon deposits. the inseparably connected porcelain body It is another important object of the inand outer metal shell is hard to clean, as the vention to provide a detachable electrode outer electrode is permanently connected to which is so constructed and mounted in the the shell so that access to the various crevices plug shell that the same will be held against within which carbon inds lodgment cannot 75 all possibility of accidental displacement by be readily obtained. the wall of the engine cylinder in which the It is, therefore, the primary purpose of plug is threaded. the present invention to devise an improved It is a further general object of my invendetachable outer electrode which may be tion to simplify and improve the construcvery easilyand quickly disconnected from 80 tion of engine spark plugs and increase the the spark plug shell or applied thereto, operating eliiciency and serviceability therewhereby the above noted objection to the of in practical use, though without increas# inseparable plug construction is obviated. ing the manufacturing cost of the plug to To this end, I provide longitudinally eX- 80 any material extent. tendingvgrooves 9 at diametri'cally opposite 85 With the above and other objects in view, points in the periphery of the shell 6, said my invention consists in the novel features grooves extending through the threaded secof construction, combination and arrangetion 7 `of said shell. An opening 10 is ment of parts to be hereinafter more fully formed in the shell wall at the inner end of described, claimed and illustrated in the aceach of these grooves or channels 9. 90 companying drawing, in which, The detachable electrode 11 is of U-shaped Figure 1 is a vertical sectional view of a form, the parallel end portions 12 thereof spark plug, illustrating the preferred embeing suficiently resilient to enable the same bodiment of my invention and showing the to be sprung apart or away'from each other.

40 same mounted in a cylinder wall; The extremities of the said portions 12 of 95 Fig. 2 is a horizontal section taken on the the electrode are angularly disposed to proline 2--2 of Fig. 1; vide inwardly proJecting lugs 13. In apply- Fig. 3 is a side elevation of a part of the ing the detachable electrode to thespark spark plug shell, the electrode being deplugshell, theend portions 12 are sprungrv tached therefrom; and apart suiiciently to enable the lugs 13 to be 1'00 Fig. 4 is a detail perspective view of the engaged in the grooves or channels 9and detachable electrode. said electrode is then forced longitudinally Referring in detail to the drawing, 5 upon the shell until the lugssnap into the designates the core of porcelain or other openings 1Q. 1 The grooves 9 are suiiciently suitable material constituting the body of deep to entlrely receive the end portions' 12 105 the plug, and 6 the metallic shell Within of the electrode. The intermediate portion which the porcelain core is fitted and permaof the electrode 11 extends dlametrically nently xed or secured, in any approved across the bottom of the shell 1n spaced relamanner. The reduced stem of theshell 6 has tion thereto and in spaced relation to the an exteriorly threaded portion 7 for engagelower vend .of the electrode 8, the space be- 110 To all lwhom it may concern:

Be it known that I, KINGSTON FORBES, a citizen of the United States, residing at Flint, in the county of Genesee and State of ment inthe threaded opening of the cylinder wall shown at C. The electrode 8 receiving the vpositive current, extends centrally through the porcelain body 5 and is secured .wall of the cylinder C, the end portions l2 are disposed ywithin the opening in the cylinder Wallso that theyare positively held within the grooves 9 against displacement. When it is desired to clean the plug, the same is removed from the cylinder wall and the end portions l2 of the electrode ll then sprung outwardly so as to disengage the lugs 13 from the openings 10. The electrode 11 may then be shifted longitudinally and entirely disconnected from the spark plug. Access may now be readily had to the various crevices between the porcelain body and' the shell of the plug with a knife or other suitable tool and such carbon as has been deposited therein removed. Thus, the serviceability and efficiency of the plug in practical operation may be maintained, and the thorough cleaning of the plug very easily and quickly accomplished. lt is, of course, apparent that the illustrated plug construction is simply indicative of that general type of inseparable spark plug to which my invention is particularly applicable, and it is to be understood that the detachabley electrode may as readily be employed in connection with various other plug constructions of this general type. rllhe device is also susceptible of considerable modification in the form, construction and arrangement of its several features and l, therefore, reserve the privilege of adopting all such legitimate changes as may be fairly embodied within the spirit and scope of the invention as claimed.

Having thus fully described my invention, what l desire to claim and secure by Letters Patent is l. rlrhe combination with a spark plug shell, of an electrode having spaced, resilient portions to clampingly engage the eX- terior of the shell at diametrically opposite points, each spaced portion of the electrode being provided with terminal means for interlocking connection with the shell. i

2. The combination with a spark plug shell having diametrically opposed openings in its wall, of an electrode having spaced, resilient portions to clampingly engage the exterior of the shell at diametrically opposite points, and saidspaced portions having terminal means for engagement through said openings.

3. The combination with a spark plug shell having openings at diametrically opposite points in its wall, of an electrode contecnica sisting of a resilient, metal rod bent to provide spaced, parallel portions adapted to clampingly engage the exterior of the shell, each of said parallel portions having an inwardly projecting terminal 'lug formed thereon for engagement through one of the openings in the shell.

l. The combination with a spark plug shell, of an electrode consisting ofy a U- shaped rod having resilient end portions adaptedyto clampingly engage the exterior of the spark plug shell at diametrically opposite points, the terminals of the electrode being wholly disposed within the opening in the cylinder wall and held by the wall and the spark plug shell against relative movement.

5. As an improved article of manufacture, a spark plug electrode formed from a resilient rod bent to provide spaced, yieldable portions adapted for detachable clamping engagement against opposite sides of the spark plug shell, each of said portionsy having an inwardly projecting terminal lug for locking engagement with the shell.

6. The combination with aspark plug having an insulating body'provided with an electrode and a metal shell within which said body is permanently secured; of a complementary electrode having spaced resilient portions for detachable clamping engagement with the shell of the spark plug.

7. 'llhe combination with a spark plug having an insulating body provided with an electrode and a metal shell within which said body is Apermanently secured, of a complementary electrode ofsubstantially U-shaped form, the spark plug shell being 'provided upon'diametrically opposite sides with longitudinal grooves to receive the terminal portions ofk said electrode, said portions oiE the electrode being held within the grooves titi lid@

against displacement by the wall of the engine cylinder.

8, rllhe combination with a vspark plug il@ having an insulating body provided with an electrode and a metal shell within which said body is permanently secured, of a complementary electrode of substantially U- shaped form having spaced, parallel, resili- 11a ent portions, the spark plug shell being provided u on diametrically opposite sides with longitu inal grooves in which the yieldable portions of the electrode for clampingengagement, saidy yieldable portions of the l2@ electrode being held within said grooves by the wall of the engine cylinder.

9. 'llhe combination with a spark plug having an insulating body provided with an electrode and a metal Shell within which said body is permanently secured, of a complementarv, detachable electrode of substantiallv lll-shaped form having spaced, parallel, resilient portions provided with inwardly projecting terminal lugs, the spark plug shell il? immo l 3;,-

being provided with longitudinal grooves on In testimony .whereof 1 hereunto aiiix my dialnetricaliy opposite slllde anddan opening .signature i'nthe presence of vtwo Witnesses.

at t e inner end of eac o sai grooves to receive the terminal 'lugs -onA said electrode KNGSTON'FORBES 5 the terminal lugs of the electrode bein hei Y Witnesses: Y v Within said openings by the wall of .t e en.- FRANK E. RILEY, gine cylinder. v A. E. Bow 1 :4. e

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