US1405549A - Spark plug - Google Patents

Description

T. E. NEW.

SPARK PLUG.

APPLICATION FILED ocT.26. 191B Patented Feb. 7, 1922.

gin/vento@ Tha-hai. E. New

attente l UNITED STATES' PATENT OFFICE.A

THMAS E. NEW, 0F CINCINNATI, OHIO, ASSIGNOR T0 PRECISION EQUIPMENT COM- PANY, OF CINCINNATI, CHIC', A CORIORATION OF KENTUCKY.

SIARK ELUG.

Application led October 26, 1918. Serial No.

Yand State of Ohio, have invented certain new and useful Improvements in a Spark Plug,

.of which the following is a specification.

This invention relates to interna] combustion engines,l and more particularly to spark plugs used in connection therewith, an object of the invention being to provide a spark plug which is designed so that the action of the piston of the engine with ,which the spark plug is used will prevent the accumulation of residue such as carbon, oil or the like, upon the electrodes or sparking points of the ilug. l

More specifically, an object of this invention is to provide a spark plug including a central stem provided with a longitudinally extending bore, the lower end of which stem `forms one of the electrodes or sparking points of the spark plug, while theother electrode is shaped to have its sparking point or end positioned adjacent to the lower end of the stem, whereby the inrush of air through the longitudinal bore of the stem, upon the suction stroke of the piston of the engine upon which the spark plug is used, will blow carbon, oil or other residue from the sparking ends of the two electrodes, and prevent the consequent fouling of the spark plug.

Another object of the invention is to pro- Vide a spark plug as specified, wherein. valve Structure is -provided andarranged to automatically scat itself upon the compression stroke of the piston of the engine, to prevent the escape of combustible gases through the bore ot' the stem of the spark plug; also to provide adjustable means l'or regulating the amplitude of movement oi' the valve for varying the amount of air admitted tothe cylinders so as to provide the proper mixture in each cylinder, which air entering the cylinder mixes with the gas therein, and tendsV to save gasoline or the volatile fuel used in the engine.

Other objects of the invention will appear in the following detailed description, taken in connection with the accompanying drawing, forming a part of this specification, and in which drawing:

Figure 1 is a side elevation ot the improved spark plug, and

Specleaticn oi Letters Patent.

Figure 2 is a longitudinal the spark plug taken at right angles through Fi ure 1.

teferring more particularly to the drawing, 1 indicates the shell of the spark plug, winch is of the usual construction bein threaded, as shown at 2, for connection wit the .head of an ordinary internal combustion engine,and having an thereby. The shell 1 carries the-usual porcelain or insulating' sleeve 4, through the lceirter of which a, stem 5 extends. The lower end of the stem 5 projects beyond the lower end'of the porcelain sleeve h4f, and also below the lower end of the shell 2, coacting with the electrode 3, in forming thesparking-point of the spark plug. The stem 5 is threaded, u short distance upwardly of its lower end, as shown at 6, which threaded portion engages in the washer 7 which abuts the lower end of the porcelain sleeved. The stem .5 is provided with a longitudinal bore 87 extendmg throughout its entire length, which bore communicates, at the upper end of the stem, with a duct 9 formed in the removable head 10 of the spark plu .v As shown in the drawings, this removab e head 10 is formed of suitable conducting material, and is substantially hexagonal in shape, present-- ,ing a fiat edge surface which engages against a washer 11 mounted upon the upper endof the porcelain sleeve 4. The stem 5 is threaded into the head 10 for connecting the head to the main body of thespark plug.

The duct 9 which bore 8 of the stem 5 also has communication with an opening or recess 12 formed in the head and this recess or bore opens out through one or' the flat faces of the head 10, having its outer portion threaded for receiving therein a set screw 13. The set Screw 13 has a stem 14 formed upon its inner end which is adapted for engagement with the ball valve 15 which is seated in the vrecess l2. The hall valve 15 is adapted to cut off communication between therecess 12 and the relatively short passageway 16 which communicates with the inner en'd of the recess 12 and with a transverse way 17. The transverse way 17 opens out into a counter sink or cup 18 formed in one of the upwardly facing sides of the head 1f) as clearly shown in ,Figure 2 of the drawing, so as to permit the entrance of air through the cup 18, ways 17 and 16 into the recess 12 and from this 1-10 Patented Feb. 7,- 1922.

section through electrode 3 carried communicates with the .t Q Leone/ie ciated, for causing a blast of'air about the 4spaced s'pinckinjg 'point of the plus' to dow residue, such ""as'carbon, oil or the like from these sparking pointsand consequently pre- ;fventthe ,fouling di the sparking points or the plug. This air ',passing through the bore f 8 ofthe stem 5. also mixes with the combustible fuel in the cylinder of the engine, tendtorequire a smaller'aniount of 4volatile or combustible vfuel than is ,ordinarily the case", internal ,combustion engines, and consequently resulting in economizing or saving: of gasoline, or analogous fuel.

l "The adjustment of the set screws 13 regulatesthevamplitude of movement oi the ball'valve 15and consequently regulates the uantity of' air admitted to the cylinder t rou'ghthe bore 8. A locking nut 19 is mounted upon the set screw 13 for holding this set screw against accidental adjusted screw structure 20 is carried A -bindin i bytheihea 10 for permitting the conneci tron of an electric conducting wire thereto.

It is evident that if it is so desired gasoline or other suitable volatile liquid may be introduced into the cylinder of the engine, through the s ark plug, by lacing a small quantity of t e said volati e fluid in the c11118 hanges in'details may be made without departing from the spirit of this invention,

f one side upon the upper end of the body portion and having a threaded aperture at 'said side for the reception of the upper end of said stem for detachably securing the head block tothe body of the lug, said block having a' downwardly inc ined recess therein opening through one of the upwardly facing sides and provided withy a valve seat in its `lower end and a passage leading from the .recessat a, point above the valve seat oomniunicating with said stein, a removable plug iiitt'ed through said upwardly facing side for closing said recess, a Valve in said recess adapted to engage said valve -seat and 'said plug being adapted for adjustment' in y the recessto limit the movement oi' the valve,

said head block :further having a` lateral opening leading from beneath said valve seat upwardly through a second upwardly facing sidethrough which air is adapted to be fed to said stem through said recess when the valve is opened.

2. in a spark plug, the combination of a body part having a hollow stem extending therethrough and screw threaded at its upper end, a head detachably iitting upon the upper end of the body and provided with an opening threaded to receive the upper end ofthe stein and for communication with the stem, said head having a downwardly inolined recess therein opening through the upper face of the head and terminating in a valve seat at a point below said passage in the head and communicating with said passage, a plug fitting i'n said upper side of the head for adjustment in the recess, a valve in the recess adapted to normally engage said seat for closing the passage through the head, said head having an intake opening lcadino from the upper side of the head to a point beneath said valve seat and adapted to admit air through the head, and a terminal connection carried upon the upper end of the head and having electrical connection with said stem whereby a terminal wire may be attached to the spark plug without removing said head.

3. A spark plug having in combination a central electrode having a longitudinal passage th'erein; a valve cap positioned upon the terminal end of said electrode and having a passage therein, said passage extending downwardly and in angular relation Awith said longitudinal passage and communicating therewith and with the atmosphere, a ball valve seated in said downwardly ex tending passage and controlling the communication with the atmosphere, and adjustable means secured to the y-upper portie of said passage for limiting the upward ,t ovement of the ball in the passa e.

' T @MAS 'Et NEW-`

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