US1398173A - Spark-plug - Google Patents

Description

.l. O. BROCK.

SPARK PLUG.

APPLICATION FILED MAY 24. I920.

Patented Nov. 22, 1921.

El 11 uewfo'c QUOT/HQAA UNITED STATES JOHN O. BROCK, OF WILSON, NORTH CAROLINA,

SPARK-PLUG.

To all whom it may concern Be it known that I, JOHN O. BROOK, a citizen of the and resident of WVilson, in the county of Wilson and State of North Carolina, have invented certain new and useful Improvements in Spark-,Plugs, of which the following is a specification.

This invention relates to spark plugs for internal combustion motors and has for its object'the provision of novel means whereby air is forced over the points of the ter-' minals at the spark gap to aid in retaining these elements free of carbon or other deposits which will reduce their conductivity, it being the purpose of this invention to have the air enter the cylinder with sufficient force to dislodge any deposits which might occur in the spark gap and result in a short circuit.

A further object of this invention is to produce a terminal on the electrode of the spark plug having a very high resistance and to that end a special meter wire is employed to aid in creating the resistance.

A still further object of this invention is to provide a hollow electrode having novel means for holding a valve for" closing the opening or port through the electrode, so that pulsations of the air are allowed to enter the cylinder at the spark gap.

A still further object of this invention is to provide a novel arrangement of parts so assembled as to retain the elements in their operative relations to one another yet' permitting their disassociation for the purpose of cleaning the spark plug, renewing worn or broken parts and the like.

lVith the foregoingand other objects in view, the invention consists in the details of construction, and in the arrangement and combination of parts to be hereinafter more fully setforth and claimed.

In describing the invention in detail, reference will be had to the accompanying drawings forming part of this specification wherein like characters denote corresponding parts in the severalviews, and in which- Figure 1 illustrates a view in elevation of a spar plug embodying the invention;

Iiig. 2 illustrates a sectional view thereof; am

Specification of Letters Patent.

United States of'Americ'a,

Patented Nov. 22, 1921.

Application filed Kay 24, 1920. Serial No. 383,855.

Fig. 3 illustrates an enlarged detail sec tional view of the electrode.

In these drawings 5 denotes the shell or body of the spark plug having the usual threaded nipple 6 to be screwed into the cylinder head'or wall, and this body has the usual terminal 7 forming a conductor and the said body has a shoulder 8 on which the insulator 9 rests, the said insulator bein held in place by the ring nut 10 which is threaded in the body, and for the purpose of producing leak proof joints between these parts, the usual packing such as 11, 12 and 13 may be inserted.

The insulator 9 is of course hollow and is adapted to receive the electrode 14, which electrode is threaded to engage a nut 15 which bears against the outer end' of the insulator and tends to draw the electrode outwardly and the said electrode has a nut 16 threaded on it, bearing against a packing ringl? which lies in the recess or socket 18 in the inner end of the insulator.

The spark plug'is provided with a housing at its outer end consisting of a sleeve 19 resting on the top of the ring'nut, and a head or face plate 20 which is threaded on the electrode so as to bear against the outer end of the sleeve and the said electrode is provided with the usual binding screw 21 to hold the terminal of the conductors for the ignition system.

The inner end of the electrode is enlarged and has a downwardly flared outer surface 22 which fits into the socket 18 in the insulator and the lower end of the electrode is further provided with internal threads 23 to engage threads of a nipple 24 of the inner head25 of the electrode, the said nipple having a valve seat 26 formed on its inner end to engage a flat end of the conical valve 27, the remainder of the valve conforming approximately to the contour of the inner wall of the flared portion of the electrode and operating as a control for air entering the cylinder through the electrode as the said valve pulsates on the influence of the intake and exhaust stroke of the piston.

The inner head is of'course provided with a port 28 to permit circulation of air therethrough and the said inner head has a spirally shaped terminal 29 which is adapted to coast with the terminal 7 for creating From an inspection' of the drawing and from the foregoing description, the construction and operation of the device will, it is thought, he understood without a resume or statement of a cycle of operation by which the results indicated are attained.

I claim- 1. In a spark plug, a body, a' hollow insulator therein, means for holding the in sulator in place, a hollow electrode extend ingthrough the said insulator, means for holding the electrode in place, an inner head threaded in the electrode and forming a valve seat, a valve within the hollow electrode operative in conjunction with the said' valve seat, and a-termmal of high resistance carried by being coiled as and for the purpose described.

2. In a spark plug, a body having a terminal thereon, a hollow electrode, means for holding the hollow electrode in spaced relation to the body, the inner end of the said electrode being flared and the inner wall thereof constituting a valve engaging element, a hollow head threaded in the said flared portion of the electrode and having a valve seat at its inner end, a valve in the flared portion of the electrode adapted to coact with the valve seat and the wall of the electrode to open and close the passage through the electrode, and head, and means for holding the parts in assembled relation.

3. In a spark plug, a .body having a terminal thereon, a hollow electrode, means for holding the hollow electrode in spaced rela tion to the body, the inner end of the said the said head, the said terminal electrode being flared and the inner wall thereof constituting a valve engaging element, a hollow head threaded in the said flared. portion of the electrode and having a valve seat at its inner end, a "valve in the flared portion of the electrode adapted to coact with the valve seat and the wall of the electrode to open and close the passage through the electrode and head, means for holding the parts in assembled relation, and a spirally wound terminal of high resistance carried by the head.

4. In a spark plug, a body, an insulator therein having a recess in its'inner end, an externallythreaded hollow electrode extend ing through the insulator, a nut threaded on the electrode bearing on the insulator whereby the position of the inner end of the electrode is adjustably held, a nut threaded on the said electrode and bearing against the outer end of the insulator, a housing comprising a sleeve embracing the electrode near its outer end, a member threaded on the said electrode and bearing against the outer end of the sleeve for holding the parts in assembled relation, a terminal carried by the inner end of the electrode, and means for controlling the opening through the hollow electrode according to the action of the piston cylinder to which the spark plug is applied. g

;5. In a spark plug, a body, an insulator therein, a terminal on the said body, a hollow electrode having a flared outer surface near its inner end, the cavity within the said flared portion being likewise flared, a valve seat threaded in thevend of the flared portion, and a conical valve adapted to coact with the wall of the flared portion of the electrode and with the valve seat.

JOHN D. BROOK.

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