US994673A - Spark-plug. - Google Patents

Description

W., E. & G. HAGSTROM. SPARK PLUG.

APPLIGATION FILED NOV. 24. 1909.

Patented June 6, 1911.

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\ .Ny 3 m ia-STRQIVI Brit-3311 A. GiBBPGRATIDh KANSAS.

gFARln T seen-e Specification of} Application filed November 24,

letters Patent.

which is preferably cup-shaped with its cup To all whom it may concern:

Be it known that we, W ILLIAM l'L-aes'rnou. EMAN URL l-Laosrnozir, and Guerra] iIlAG" s'rnoiu, inventor citizens of the United States of America, and residents or Lindsbore! Mi'zllhe county, State of lie Patented June 6, 191 1.

Serial No. 529,663.

' cing upward, as shown in Fig. 3.

The bottom of the casing A has an enlargcd opening A,

quite so large the result th .entm in new and useful which lip is proi'cme ts in S Plugs, of which the prel'erahly of following is a SPLPliiij-li'lfifl. 7 whi e l (hui or ion lates to sparl-c plugs and inner l r us i movements in such desmall 1h respect to construe out. (1'

n. rts that will pre- =ch devices. Such ll many inon being a i-ulil'tls or upon some of arts that sluuild. be insulated from each otnc and such short-circuiting is, of course. fldvl; it {go to be overcome.

In uccon'ipanyiug drawings lligure l an elevation of a plug at an enlarged size showing the exterior thereof; Fig. 1s longitudinal section corresponding with Fig. l, buthaving the main or central ste n in elevation, and Fig. 3 a detail partly n elevation and partly in section at a. still more enlarged scale. for the purpose of showing a collar [1])01'). the central stemof the device which collar may be either integral with the stem, as sl'iown or may he a separate piece upon "he stein.

the said drawin.

i l vices particu k l 4 i L .o the threads C. ti restin on a'shoulder ll is body F. This insulating; body I ma be of any insulating material, but is 'ably of porcelain. which is less denihle except for bit-faking than other is usd the purpose. A Washer G is bottom ofthe inin shoulder which l' upon the to oi u thin'ible or sleeve H. The insulating bodyF has an auxiliary opening theret-hrough, in which auX- iliary opening is a pin or stem ll provided with. a. collar J in a chamber in the lower part of the insulating body F and a nut K on the upper threaded end of the said stein. Below the collar J is another collar J lip A? washer L per; J to ternuna which projection extend ing and oi? the plu within the ca reason of the upon it, which thirnble, as

is held down l) is preferabl portion than at its per-i opening through the center ot. the

which opening is not as thcinternal opening, with at it provides a lip A on :1 washer L. This washer is the shape shown in Fig.

shape is such that it is thinner at pheiw. A

nits the lower end of the em to 11. a smell pro ection J outside of the casmS one of the sparking points The washer L lies loosely sing A, and 1s held down by thimble or sleeve H resting by the collar G. The washer y made of porcelain and is an insulator between the casing A and the end JFof the central stein J. In devices as heretofore made, the metal the shoulder A isually sparking poin suit that i upon the side sh ort .f carbon or oil should be represented by comes close to the t orprojcction J with the redeposited of the projection J and the The bevel on the the Washer L is so arranged splashed upon the botasher L it will run down by gravity away from the central stein i. The

into

projection J.

u iarkiiu point consists of a. stem M the casing A and havingan cct1ng toward the sparking before dcscribech.

The angle between M and M is an acute angle thus leaving a corner M which is lower than any other part of the inserted point this sp the extreme 9 is that if oil parts it; and

nearest together, the

gravity into a from the siiar ark point does not come The result The extreme end M of adjacent to spark point 3 but of it. at some little the extreme end of of this construction splashed upon the ace Where they are oil. would run by 11d drop at the extreme end of nd of the should be J at the pi away from the point M or would run down the point M to the corner M away king point J It will be seen consequence, an additional means of preventing short-circuiting.

The sectional view in Fig. 2 will show the manner of putting the device together, which may preferably be stated as follows: The washer L is placed within the casing A and the bushing or-thimble H placed thereon.

The washer or ring G is then placed upon the shoulder E so as to hold the th imble H down. The central stem is then placed within the central body F and secured in place by means of the nut K. The body F is then placed within the other case and the nut D screwed down to secure the different parts firmly in position. The device in use usually stands upright in the position shown in the drawings.

'What we claim is: 1. In a spark plug, the combination with a casing having .an annular inwardly-extend ing fiange at its lower end, and an insulating body carried by the casing, of a central stem supported by the insulating body and having one end projecting through and beyond the lower end of thepasing to form a sparking point said central stein havi'ng thereon within the casing and adjacent the lowerend of' the insulating body an invertedcup sha ed guard serving to preventconducting bodies from being conveyed "on said stem beyond suchguard, and a porcelain washer t surrounding the stem and supported the,

annular flange at the lower and of said casmg, said washer having concave lower and upper faces.

2-. In a spark plug, the combinatioe witha casing having a washer siipport at the lower end, and an insulating body carried by the casing, of a central stem supported by the insulating body and having one end projecting through and beyondthelower end of the casing to form a sparking point, said central stem having thereon ;withiii the casing an inverted cup-shaped guard serving to prevent conducting bodies fI'OIH.l)B1I1g I conveyed on said stem beyond such guard, and a porcelain washer mountedkon said surrounding washer support of the casing and surrounding the stem, said washer .having concave upper and lower faces, asaand for the purpose described;

Signed at Lindsborg, Kans. this 17 th' day of Nov. 1909.-

Witnesses:

PAUL CARLSON J. A. Momma.

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