US982474A - Spark-plug. - Google Patents

Description

FICE..

EARL CANEDY, F CIQCLG HEIGHTS, XLLNGIS.

Specification of Letters Patent. itpatented Jan. 24, '1911.

Application i'lcd March iti, i965. .lcrial No, 259,445. n

in -vsparking plugs" t'or explosive engines and is embodied in the construction and are rangement of parts presently to be described and defined in the claims.

My invention is designed to avoid the necessity of the use of a Wrench or hand tool and to render the sparking plug susceptible of being quickly removed, or atletst the insulator, without the employment oit hand tools or wrenches.-

A :turther object of the invention .is to t providea sparking plug with an insulator holder, the latter having an attached handle extension thereon, and to so form the connection between tl e insulator holder and the nipple that the same can be easily removed without a lull rotation of the parts.

A still further'object is the provision o a. sparking plug` with what. l have 1f 1"led a quick release i for the insrdator 'associate with the holder for the insulator an outwardly extending handle. In connection withthe quick release, it is designed to be applied from two or more dilli'erent positions so that should the nipple be threaded into the cylinder and be positioned so as to have some of the fixed parts ot the engine interfere with the handle of the holder, then the holder could be turned to another position` and the coupling properly made. l

In my construction a further advantage may be stated to reside in an ,insulator holder with a handle so 'that when the insulator is removed the handle can bey employed conveniently for holding purposes during the cleaning operationn Again by employing ay handle as a part of the insu lator holder and thus avoiding the use of wrenches, the liability oli breaking the proy truding end of the insulator avoided which is not the case when a detached wrench is employed.

lith the above stated. objects of the invention, I desire it understood that the construction shown in the accompanying draw- "oint is formed lt is to be und ings is one embodiment but that variations cau be made Without departing from the nature of the iwf-enden.

Figure l, is a loingitudinal section of a sparking plug embodying the invention,

showing a part ot the cylinder; Fig. 2, is a perspective View ot the sparker; Fig. 3 is a, section through the line i3- af ot Fig. l; showing only the nipple; and Fig. il, is a sectional View of the carrier.

A designates the exterior metallic shell the same being a portion of the cylinder part oit an explosive engineY into which is secured by s threaded cmineotion the sparking nipple l 'torn'iing one ot the electrodes. This sparkiiig nipple having a central bore is irovided eteriorl): with a Wrench hold and the upper part of the interior chambercd out or enlarged to form a receiving portion 'tor the insulator carrier or hohl tel), presently to be described. The nipple l is so constructed that it can be readily produced by iinachine Work, the lou'cr wall of the upper clnnnberedpart being provided With a seat such as L. The inner side Walls of the chambered part ot the nipple are provided With suitable interrupted threads ar ranged at ditiierent points to torni one por tion or oit a breech block coupling s Y f fhoun in 2l.

C de gnates what l' shall terni a holder or carrying sleeve haring a central boro, the upper portion ot `which is threaded and io the threaded portion adapted to be fitted the hollow bushing l). Below the threaded portion oit the holder C is a chamber, the louer end oit 'which terminates in an inwardly extended tlange c, against which a packinga gasket rests. the holder C has the extended couplin part C formed with suiu able interrupted threads at ditlerent points and corresponding in length to the length of the space between the threads in the chamber of the nipple B, The purpose of this construction is to acquire a breech block type ot joint, whereby the holder can be inserted quickly' in the nipple and by a lturn than a complete turn, be securely positioned in the nippleL ln this connection the construction is such that the lower V`endv ot, the holder can loe readily machinetinished so that, when the parts come 'together a practical and ehcient,

conn kci n tl' e n, in tl l ing can se .f

out from the upper portion of the holder is a lever E in the formof a hand hold, the same being lixedly secured to the holder. This lever may be provided with a suitable opening, if desired, at its outer end. It is to be understood that the particular form of lever shown is a preferred embodiment, but that various other forms or engaging projections or :hand holds can be employed.

.F designates the insulator, which at one end projects into the nipple and at the opposite end projects beyond the holder and 'is exposed, as is customary, and, as is usual,

this insulator is conveniently made with a longitudinal perforation through which the electrode G passes. This insulator is provided at a point adjacent its center with an annular `shouldered part f fitting in the lower part of the holder C and between the horizontal parts of the shoulder both above and below are placed conveniently suitable sealing agents or washers, and by the packing -nut this insulator is iXedly secured in the holder C. The insulator may very conveniently be cemented into the holder as in practice it will seldom be necessary to remove the insulator from the holder. The elect-rode G is conveniently secured in the insulator in any suitable manner, one method being illustrated in the drawings, which method is by threading onto the lower end ot the conductor a suitable nut f2 and at the upper end securing a cap g having a depending annular flange fitting the upper end o the insulator. Interposed between the cap g and the insulator is a compensating disk g so that when the cap is screwed down on the conductor the compensating disk will permit slight expansions ofthe materials without causing rupture. On the upper end of the electrode is a thumb nut g2 between which an'd the cap the main conductor wire is attached. The lower end or sparking end of the electrode G is conveniently bent at a' right angle to a point adjacent the inner wall of the bore of the nipple B, and inasmuch as the metallic parts are machine-finished the electrode' together with the insulator can be readily removed and when replaced the position of the sparking point relative to the nipple wall will always be the same. This is an 4important advantage.

In operation should the lower part of the insulator in the nipple become coated with carbon, it is only necessary to give the holder a quarter turn so that the threads thereof will register with the smooth parts between the threads of the nipple, and it may then be quickly drawn out thereby exposing the lower part of the insulator which can obviously thereafter be easilyzcleaned, and again quickly replaced. The construction also avoids the necessity of the use of the vexceedingly diflicult to employ a wrench;

and the avoidance of the removal of the nipple.

Having thus described the invention what .is claimed as new and desired to be secured by Letters Patent is l. A spark plug for explo, ive engines comprising a nipple part threa ed for fixed connection with the cylinder of an engine,

larged chamber formed with a parallel series of interrupted threads, the seriesbeing spaced apart at opposite ends leaving intevening spaces, a carrier having an internal bore,.a handle, and a seriesoia interrupted threads adapted for cooperation with the threads of the nipple part, an insulator in the carrier and projecting in opposite directions beyond the same, and a nut bushing at the outer end of thc-.carrier having a threaded engagement therewith, substantially as described.

2. A spark plug for explosive en 'nes comprising a nipple part threaded for xed engagement with an engine cylinder, the outer part of the nipple having an enlarged chamber formed with a series of interru ted threads spaced apart at opposite en n carrier having a cent-ral bore, and an inwardly extending shoulder part at its inner end and a threaded outer art, inter rupted threads on the'outer ace of the lower part of the carrier adapted for cooperation with the threads of the nipple, a nut'bushing threaded to the upper art of the carrier, a handle extension on t e car-- rier, and an electrode having a shouldered part resting on the shoulders of the carrier and with which the nut bushing coperates. In testimony whereof I alix my signature in presence of two witnesses.

EARL CANEDY. Witnesses:

Trios. R. HEATH, CALVIN T. MILANS.

the outer part of the nipple having an eno los

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