US1230287A - Spark-plug. - Google Patents

Description

G. L. FREEMAN.

SPARK PLUG.

APPLICATION FILED FEB.4. 1916.

1 ,%'Z, I Patented June 19, 1917.;

NITED s'ra'rns PATENT orrucn.

en'onen L. FREEMAN, or 'rrconn'nnoea, NEW YORK, assmn'on or ONE-HALF r0 RICHARD r. HAYES, or 'rroonnnnoea, NEW Yonx.

sranx-rmuG.

' Specification of Letters Patent.

Application filed February 4, 1916. Serial No. 76,210.

for internal combustion engines and resides more especially in the production of a spark plug which can be readily affixed to any well known type of engine. I,

In practice it has been-found that after using a spark plug in the ordinary type of engine where it 1s exposed to the products of combustion, anappreciable amount of carbon is soon deposited upon the points or between the'surfaces over which the spark jumps, and'the efliciency of the motor is materially reduced, sometimes to the extent of complete inoperativeness, until these plugs have been removed, the-points carefully cleaned, and the plug again positioned in; the motor.

Certain attempts to remedy this difliculty have been made and shields or protecting guards have been arranged about the spark points so as to deflect the products of com bustion and prevent the collection of oil and carbon.

To some extent, devices of this character have addedto the efficiency of the motor for a period, but after continued usage the efliciency is again reduced and the removing and cleaning of the plugs are required at frequent intervals.

An object of the present invention is to overcome these existing difliculties, and pro vide a spark plug in which the'accumulation of oil and, carbon is' prevented by means peculiarly a part of the sparking terminals or. omts. 1

other object of the res'entinvention is the reduction of a s ar plug including, in

com ination, a mova le terminal; suppo and positioned upon the lower end of the plug and adapted to coact with an opposing stationary terminal for preventing t e 'deositing of oil, carbon and other extraneous oreign matters therebetween.

' With these and other objects in view, the

invention-further consists in the combination and arrangement of. parts adapted to ex-.

elude all barbon and oil, and add materially to the economic yalue of the plug for general use, as will more fully hereinafter appear.

In the drawings which show by way of illustration an embodiment of my ll'lVGIltlOIl,

and in which similar reference characters designate like parts-'- Patented June 1a, 191?.

Figure 1 is a side elevation of my 2 proved spark plug. I

Fig. 2 is a vertlcal sectional view thereof. Fig. 3 is a detail perspective view of the tubular washer adapted to space the movable terminal and seal the space around the central stem or rod against the entrance of oil and carbon, and

milar view of the movable ter-' Fig. 4 is a si mina x Referring to the drawings, my present in-' vention includes among other things an outer shell 1 provided with the usual screw threads 2 for positioning the plug in thecylinder of a'motor (not shown). Thisshell has near the upper end thereof flattened or hexagonal surfaces 3, by means of which it can be readily positioned and securely adjusted in the cylinder of a motor.

An insulating body portion 4 is arranged within. the shell 1 and is provided with the usual tapering upper ortion 5, as shown.

The material from which this body portion 4 is made is preferably porcelain, but it may be of other substances or compositions possessing the. necessary characteristics to ermit of the proper'operation of the p u This body portion 4 is provided with shou ders 6, as shown in Fig. 1, against WhlOh a ably arranged near the top andbottom; respectively, of the outer shell 1, and is arsuitablepacking or sealing material 7 is inserted. This packing material 7 is preferthreaded into the upper portion of the shell,

as will be readily understood. By this construction it will be readily seen that the body portion is completely sealed within the shell 1, and protected; against the entrance of oil and car on. f p d The body portion 4 is provided with an opening 9 extendingthe length thereof, and

arranged to receive a rod or stem 10 threadedat the upper end as at 11 and threaded movable terminal 14 in position. The usual at the lower end as at 12.. A head 13 is provided on the rod 10 and servestoholdthe cap screw and locking nut 16 are pro-.

, ed upon the rod or stem 10, and is provided I rod or'stem-10. In the operation of the dewith a beveled upper surface 18. By this construction it will be readily seen that oil and other substances will be deflected and prevented from accumulating on the terminal. Suitable projections 19 extend from the said terminal and are adapted to coact with an annular stationary terminal surface provided on theunder-side of the sleeve-20 of the outer shell 1. As shown in the drawings'this terminal surface on the sleeve 20 is annular, but I do not limit myself to such shape, as various other contours can be provided.

A tubular threaded washer 21 'is-interposed between the movable terminal 14 and the lower end of the body portion 4 and serves to confine packing 22 about the rod or stem 10 and prevent the entrance of oil, carbon or the products of combustion within the body portion.

This washer 21 is constructed with a hea 23, between which and the upper'beveled surface of themovable terminal 14, a space 1s preferably provided. This space can be regulated as occasions require.

As hereinbefore mentioned, this terminal 14 is movable and free to rotate about the vice it will be apparent that the successive sparkingbetween the movable and stationary terminals will produce a vibrato action upon themovable terminal 14:, which is sufiicient to dislodge the products .of' combustionoil and other substances as they encircle the lower end of the spark plug immediately following the explosion stroke of the piston. The force of the explosion and general vibratory action of the motor will also tend to move this terminal member 14 and assist in the reinoval of all carbon between the movable and stationary terminals, as well as in and around the washer 21 and the protruding end of the body, portion 4.

' From the. foregoing it will be obvious that I have produced an eflicient and substantially self-cleaning spark plug capable of long and reliable service in motors of the in.- ternal combustion type.

Having ,thus described my invention what I claim and desire to secure by Letters Patent is:

1. A spark plug of the character described including in combination a stationary terminal, an adjustable rod extending through said stationary terminal, a movable terminal carried by said rod said movable terminal comprising a disk having a coneshaped upper surface formed to $10 e downwardly toward the edge of said disk from I the center, and upwardly extending sparking points arranged near the edge of the said cone-shaped upper surface and spaced from the stationary terminal.

2. A spark plug of the character described including in combination a stationaryterminal, a rod extending through said stationary terminal, a head formed on the lower end of said rod, an adjustable washer threaded on said rod. and'spaced from the aforesaid head, and a movable terminal loosely mounted between the said washer and head,

said movable terminal having a sloping upper surface and sparking points spaced from the stationary terminal.

In testimon whereof I aflix my signature in presence 0 two witnesses.

GEORGE L. FREEMAN.

Witnesses:

RICHARD -F. Hams, JAMES F. Frrz GIBBON.

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