US895225A - Spark-plug. - Google Patents

Description

y Emmi). Ust 1;, 19e-a.

Y W. L. ASH.

`` SPARKYPLUGW APPLICATION FILED OCT. 11, 190;` I

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SPARIGPLUG.

Specification of Letters Patenti.-

Patented Aug. 4. 1908.

Application med october u, isos. serial No. 282244.

To all whom it may concern:

Bo 1t known that I, WILLIS L.\uo.\'r Asn,

having mv oost-etlice address at Lansing,

ex'ilosion, but also as a packing: to prevent L leakage through the opening around the a citizen of the United States, residing and in the count) of Ingham and State of Michican, have invented certain new and useful Improvements in Siarlvllugs, of which the I i a cap L wlnch is held by a lock nut U bearing following is a speci eat-ion.

Mv invention relates to spark plugs for ga'solcne or las engines, and its object is to revent leakage through the plug, diminish iability of breakingT the porcelain insulator, and diminish the liability of injury to the electrode or the insulator by the heat and shock of the explosion. I attain these 'objects by the construction shown in the' accompanying` drawings, in which Figure 1 isa longitudinal section of my spark plug complete. 4Fig .2 is a partial longitudinal se'ctlon of a modified form on a larger scale. Figs. 3 and 4 show different methods of constructing the head of the electrode.l

The body P of my spark plug is of the ordinary construction and is adapted to receive the porcelain'insulator A, said insulator beiner retained in position by the shoulders H and I, which are compressed between the WaslierK and the bushing J, as shown in Fig. 1. This washer K is preferably of coper, and acts as a packing to prevent any eakage around the insulator. The upper extremity B of the insulator is of a conical shape, and the entire insulator is pierced longitudinall with an opening about th of an inch in iameter. Ordinarily it is not advisable or safe to'use` an insulator with so large an openingwas stated above, but the peculiar construction of the electrode emplo ed b me makes it possible to do this wit 1 per ect safety, and great advantage in. point of durability and ease of assembly and re air. The. electrode D. passes freelyl throngl the opening C. On tneupper extremity is either formed or attached an enlarged cap E, towhich is secured the sparking point Q. Between this cap and the extremity of the insulator B is placed a cushion or ring of asbestos or similar material which seats'in an annular cuo shaped recess formed in the inner face of the. cap E, one wall of which is defined by the electrode D and the other wall of which is defined by an inwardly extending flange. vThis cushion serves not only as an elastic cushion to rotect the point of the insulator from the s lock of the bren ring the porcelain.

frictionally thcreagainst; a dish shaped annuiar spring washer )I tits inside the cap around the electrode D,and between it. and

the body A of the insulator as shown in Fig.

1 to further relieve the shock of the discharge and allow for expansion and contraction of theelectrode D.

s shown in Figs. 2, 3, and -1 the head of my electrode ma) be constructed in various way?. Thus it may bc formed integrally on thc body as shown in Fig. 3. er screwed to it as shown in Fig. 4. At resent I much prefer to form the head in l ie `forni of a cup as ,shown in Figs. 3 and 4, but if desired it may lbe constructed in the manner shown in Fig. 2, namely, with a llat lov. er surface: in which case the elastic cushion Ii is preferably rctained in position b v beingr ...ibeaded in a slight depressionen the extremity B of the insulator.

This construction, as already stated. enables moto use a large electrode. This is of material advantage for several reasons. It conducts away the heat more rupi-ily from tbe It enables :ne tu secure the electrode in place with screw threads instead of cement, as is customarythus scouring a more perfectprotection againstleskagedess liability to destruction by shock, 4which often .produces --lcakage b v breaking the cement, .and great ease of repairing or replacing the electrode or insulator in case of injury. The enlarged cap combined with the elastic cushion and the lange electrode -rod serves to a great extent to protect the oint of the insulator from the heat. sind also trom the shock of the explosion. Besides, their large size and close contact with the body of the insulator serve t0 conduct the heat rapidly away from the point, :1nd thus` oint, thus diminishing the danger of 1. A spark plug embodying an insulator,

formed with a threaded opening receiving .if said elect-rode, a sparking oint jheyond the (interface of said c osed en sind Cap at its open end being fornied with at; annulardrup shaped recess which merges into said threaded opening of the rap Wneren a doa'nwardlv hanging protecting s formed an elastic cushion seating in l recess, a second cap having an-ope:i ing *ciw-:nigh which the opposite end of said electreie passes, an annular ldish shaped sprirg washer perforated and receiving said insulator and disposed 'between the last named end of the insulator and the end of said sse-.ond cap, and a securing nut on the electrwcie hearing against said second ca 2- spark plugr embodying an insuiixtor, au elegir-ode passed axially through said in'- suI-atezfr., said electrode being pro vided at one end thereof with an enlarged head bearing against the end of said insulator a'nd having 20 a sparking point, said electrode having its other end inreaded, a securing cap on'the threaded end of said electrode, saideap havingan auxiliar fia-nge receiving an d surrounding the adjacent end portion of said insulator 25 and an annular dish shaped spring cushioning washer surrounding said electrode and received Yn said flange, said Washer being interposed oem-een and lying in Contact with the body of said cap and thendjacent end 30 face of said insulator.

In testimony whereof I affix my signature in presence of two Witnesses. p

XVILLIS LAMONT ASH.

Tit-nessesi E perm: L. LAWRENCE,A Bangs I. CHASE.

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