US1314490A - Ignition-plug - Google Patents

Description

o. ALLEN, JR'.

IGNITION PLUG.

APPLICATION FILED JAN-6. I919- Patented Aug. 26, 1919.

INVENTOR wlmsm;

y M M H A UNITED STATES PATENT OFFICE.

' OGLESTBY ALLEN, JR., OF CHICAGO, ILLINOIS.

IGNITION-PLUG.

Specification of Letters Patent.

Patented Aug. 26, 191 9 Application filed January 6, 1919. Serial No. 269,766.

marked thereon, which form a part of this specification.

This invention relates toimprovements in spark or ignition plugs for explosion ongines, and the invention consists in the combination and arrangement of the parts shown in the drawings and described in the specification, and is pointed out in the appended claim.

Among the objects of the invention is to provide an ignition plug which is made of few readily fabricated parts; which is exeeedingl y durable and rugged; the construetion of which is suchthat theplug elements unay be readlly taken apart tor the purpose of oilicientl y cleaning the plug elements and the parts of which are so constructed and arranged as to reliably localize and limit the sparking zone at the ends of the terminals and avoid fouling of the terminals.

In the drawings,

Figure .l is a. side elevation with parts broken away oi an ignition plug embodying my invention.

Fig.2 is a side elevation of a removable assembly of the plug whic lrcarries the terminals;

Figs. 3, 4, and 5 are details of a removable element which in part constitutes the grounded terminal of the plug.

Reference herein is made to a grounded terminal to indicate what is herein shown as a tcrminal which is grounded on a metal part ployed for sake of simplicity of description i and is not intended to be limiting.

As shown in the drawings, 10 designates the cylinder head.

' as a whole the body of the plug which is a metal shell-like structure. It is formed with a reduced lower end 11 that is threaded to engage a threaded opening in the cylinder head and is provided at its upper end'with a polygonal portion 12 adapted to be engaged by 'awreuch to thread the shell into The bore of the shell 10 is formed with an upper enlarged portion 14 which is internally threaded and opens at the top of the shell, a smaller, axially aliued portion 15 which opens through the reduced lower end of the shell. The differential (lltU IIOtOIS oi the bore of the shell produce between the portions 14 and 15 an annular flat shoulder 16.

17 designates as a whole an insulating core the core is formed a downwardly facing annular shoulder 21 and between the intermediate portion 19 and the extended portion 20 is formed an upwardly facing! annular shoulder 22. 24 designates a tubular nut that is extcriorly threaded tov engage the threads of the larger portion 14 of the shell bore and is formed with a polygonal flange 25 for engagement by a wrench. The lower end of the nut engages. the upwardl y facing shoulder 22 of the core 20 and when screwed down into the shell serves to force the shoulder 21 of the core downwardly toward the internal shoulder 16 of the shell. The said core 17 ,is made of suitable insulating material. he core is made of such length that the lower or inner end thereof'extends well beyond the reduced lower end 11 of the shell. I

Said core is axially apertured to receive a close fitting rod 26, the lower or inner cud of winch extends below or inslde said reduced end of the core to constitute the live terminal 27 of the plug. The rod is threaded at its upper end to receive the usual bind- 1 'ingniits, and may formed on. a member of conducting that is removabl' tween the should and shell, respectively. As herein shown,

be non-rotatabl y fixedto the eolre in any suitable orpreterred manner.

,. The grounded terminal or terminals are i'naterial. confined in the shell bers 21 and 16 of the core there are two grounded terminals 28 arranged one at each side of the live terminal 27, andthey are formed integral with or electrically connected to a flat ring 29 which is of a diameter to snugly lit in ,the lower the live terminal is also favorable for proper sparking between the terminals. The said arms 30 are also shown as convexly curved on their outer sides 'and lit/closely the smaller circular portion 15 of the shell bore, belng (-ontined between the mnerwall ol' the said reduced portion of the bore and the lower reduced portioniltl ol the insulating core 17. This construction serves to'hold the arms, which are in themselves preferably of suitable relative the ire terminal.

-'l o rcmove'the operative parts ol' the v we the nut 25 lSdlTlSClIBVl/Qd from the shell,

- whereupon the core,

cal lying. the live term1- nal, may he'ieadily lifted away from the sh'ell.. 'lhereatter thermg 29 which carries the grounded terminals may be lifted out of the shell. Said ternnnals,-when. thus removed from the shell, are Free to be cleaned as separate parts, and the bore ol' the shell may bealso readily cleaned hy 'uim'ing a cleaning parent.

brush or swab therelhrongh, as will be up \Vhen the parts are cleaned the ring 25), carrying .the tcrn'iinals 28, is dropped into the shell upon the shoulder 16, after which the core is' inserted into the shell with the lower reduced end between the units 30 and with. the downwardly facingshoull'ace of the ring. lhereal'ter the nut 25 is screwed down against the upwardly facing shoulder 22 oi the core which serves to force therii'ig 29in close contact with the shoullt will lhusbe obirved that a very good electric contact is itlillllttilletl between the grounded terminal faces of the ring and coetween the periphery of acting shoulder,

stiffness, rigidly in place device and. the shell, which Contact o curs 7 at, the fiat meetm the ring and the unthreaded portion of the shell and between the arms 30 and the inner wall of the reduced portion 11 of the shell.

()no advantage of the construction described is due to the removability ofthe 7 core' and all of-- the terminals freely upwardly from the shell so that when the plug is disassembled said terminals may be freely cleaned of carbon deposits. Another ad-- vantage "of the particular embodiment of the invention shown isdue to the fact that when r the core and terminals are withdrawn-free access may be had to the shell bore to th0roughly .clean the same without liability of destroying the relative positions of the terminals when the operative parts are again assembled, such aS is likely to occur in known forms of ignition pl'gs in which the ground ed terminals are fixed toand carried by the shell. A further advantage ofthe construetion disclosed is the means by which the grounded terminal device is "clamped between the shell and the insulating core and i "which permits ready removal (if-said core and the groumled' terminal device and convement assembling of sald parts; Another advantage of the construction shown is due to the bracing of the arms which carry the 1 grounded terminals. in this connection it will benoted that said arms aremade of substantial cross section. so that they are -1I1 themselves quite stitl' which, taken in con-m nection with the eloseconfining of the arms along their length between the shell and core insuresa deliniteor nonvarying spacing of the term nals. A further advantage at the UUHStl'HOtIOl] IS found in the tact-that the terminals 27 and 28 extend beyond both the core 30 and 'the metallic shelland are, delinitely spaced a distance apart at; their ends less than the distance of protrusi'onof the core l'roni the shell. "Therefore the terminals are snlriectedtothe direct action of the explosion in themngine cylinder and, being relatively narrow,.are in the influence of tlle'lOt'flliZtitl ellects elf-sm rking so as to. be kept free-from carbon deposits in all parts thereof that project beyond the core and thereby limit or localize the sparking area, at the ends of the sparking terminals.

I claim as my invention:

An ignition plug for explosive engines I I I comprising a metallic shell formed with an der 21 thereof resting against the upper upper enlarged and a lower reduced bore and with a shoulder betweenthem, a one-piece extending axially through the core and beyond the inner end thereof, and a ring clamped between the shell and core shoultiers and provided with angularly spaced arms which are confined and braced between the eore and shell and in Contact with the shell and extending beyond the core, said nrms beim. turned at their Fr b. nnrlR toward eneh other and the live terminnl and spaced from the live terminal to constitute 10 the grounded terminals of the plug.

In testimony whereof I eluim the foregoing as my invention. I hereunto append my signature at Chicago, Illinois, this second day of January, 1919.

()(lLESBY ALLEN, JR.

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