US1534986A - Spark plug - Google Patents

Description

Patented Apr. 21, 1925.

UNITED STATES PATENT OFFICE.

GIUSEIEPE NATOLI, OF YORK, N. Y.

SPARK PLUG.

Application filed March 1, 1924. Serial No. 696,287.

T all w/iom it may concern: lain and is provided with the central elec- Be it known that l, Grosnrrn Naroni, a trode 6 which is preferably cast into the subject of the King of ltaly, residing at lower end of the receptacle. The core is New York, N. Y, have invented certain new so provided with a shoulder 8 which exand useful Improvements in Spark Plugs. s around the core and thus forms a of which the following is a s )eciiication. means of securing it into the shell. Packing This invention relates to an improvement ring 11 placed between the shoulder 8 and in spark plugs and has for its object to proi c ill 1 prevents the gases from escaping vide a construction which can be easily confrom the cylinder of the engine and the 10 structcd and taken apart and can be made ore 5 is secured in place by means of a 60 of a minimum number of parts. A further securing nut 11. This nut 11 is threaded in object of this invention is to provide a long shell 1 and bears down on shoulder 8 beand comparatively large receptacle around tween which a packing ring 12 is provided. the central electrode for the purgose of coolit very essential that the space 9 in the if) ing it, this receptacle being adapted to be receptacle he of considerable length and of C5 tilled with oil which acts as a. medium for sutlicie t breadth so that the electrode (3 will transferring the heat from the electrode. A have large area vertically for radiating still further object is to pr vice a means heat therefrom to the oil contained in space for allowing the escape of the volatiliaed oil 9. and that the oil or other suitable liquid but preventing the liquid itselt from rundirectly contacts with the electrode. 7 ning out or the receptacle and this means The shell is closed at the top by means of comprises a valve situated in the closure of a closure 13 through which the central electhe cylindrical receptacle. A small hole is trode projects and in which is provided a provided in the grounded electrodes forprevent 14; having a valve 15 therein. This venting the accumulation of oil to thus prevalve is retained on its seat by means of a 7. vent the carbonization of the sparking small spring 16 one end of which is secured points and its immediate surrouiulings. to the closure 13 and the free end of which Further objects will be apparent from the presses on the valve. Thus the plug may be following specification taken in connection turned or secured in an 7 position since the with the accompanying drawing in which: oil contained in space 9 cannot flow out, yet 80 Figure l is a longitudinal se tional view it this oil should volatilize due to excessive of the spark plug heating, the vapor can escape through the Fig. :2 is side elevation thereof, and vent and cause no injury to the shell. A Fig. 3 is a plan view showing the elecsmall nut 17 is preferably threaded on the trodes of the spark plug. electrode 6 to fasen the lead wire thereto in 35 Referring to the drawing the shell or the usual manner. base member 1 is provided at its lower end This spark plug can be easily taken apart with a screw-threaded section 2 into tie for cleaning purposes by merely unscrewing lower end of which the grounded electrodes the retaining nut 11 and lii'ting the core out 40 3 are provided. These electrodes ma be of the shell. 9o

integral with section 2 as shown or may he I claim as my invention made separately and then inserted and se- 1. fr spark plug comprising a. shell; a cured in any suitable A small hole co he in said shell having a. long receptacle l is drilled through the electrode 3 1n orde I r therein; a retaining nut for securing said that oil which may collect on them may run core in said shell; an electrode secured in through the hole to thus prevent carhonizasaid core and extending vertically through tion which might ultimately result in a said receptacle; a closure for said core hav short circuit. ihe core member ing vent therein; a valve for said vent; mg a re in lo 1s ina' v l means in said receptacle for cooling said an sulating "all but i rode. said valve allowing the escape of the cooling medium under excessive heating.

2. A spark plug comprising a shell; a core in said shell having a long receptacle therein; a retaining nut for securing said core in said shell; an electrode secured in said core and extending vertically through said receptacle; a closure for said receptacle having a vent therein; a valve in said vent;

and a cooling medium comprising oil in said receptacle adapted to surround and inti- 0 mately contact with said electrode to cool it said valve allowing the escape ofgthe voiatil ized oil upon excessive heating. V

In testimony whereof I aflix my signature GIUSEPPE NATOLI.

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