US1299040A

US1299040A - Spark-plug.

Info

Publication number: US1299040A
Application number: US17895917A
Authority: US
Inventors: Edmund O Sather
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-07-06
Filing date: 1917-07-06
Publication date: 1919-04-01
Anticipated expiration: 1936-04-01

Description

E. O. SATHER SPARK PLUG.

APPLICATION FILED JULY 6 191 I.

1 ,299,04Q. Patented Apr. 1, 1919.

j ah'uwiloz E 0. Sail ies EDMUND'O. SATHER, or BERKELEY, CALIFORNIA.

SPARK-PLUG.

rename.

Specification of Letters Patent.

Patented Apr. 1, 1919.

Application filed July ta, 1917. Serial No. 178,959.

Be it known that I. EDMUND O. SATI-IER, a citizen of the United States. residing at Berkeley. State of California, have invented certain new and useful Improvements in Spark: Plugs, of-which the following is a specification. V p a This invention relates to an improved spark plug and has as its primary object to provide a device of this character adapted to produce a double spark.

Theinvention has as a further object to provide a spark plug having a main or energized electrode and a ground electrode with a neutral electrode arranged therebet-ween so that, the current from the main electrode will first jump to the neutral electrode for creatiug one spark and will then jump to the ground electrode for simultaneously creatinganother and intensified spark.-'

The invention has as a still turtherobject to provide a spark plug having an improved mounting for the neutral electrode and wherein the said electrode will be practically twice the diameter of either the main electrode or the ground -elect-rode tor accordingly increasing the volume of the spark and prolonging the durability of the neutral electrode.

And the inventionhas as a still further object to provide a spark plug which will prove thoroughly practical in use and whercin the porcelain of the plug will be so mounted as to minimize the tendency ttiward breaking or cracking of the said porcelain.

' Other and incidental objects will appear as the description proceeds and in the drawings wherein T have illustrated the preferred embodiment. of the invention and wherein similar referencecharacters designate corresponding parts throughout the several views:

Figure 1 is a side elevation of my improved spark plug.

Fig. 2 is a vertical sectional view more articularly showing the construction of the plug and the arrangement of the electrodes thereof, and

Fig. 3 is a'perspective view of the upper seating gasket for the porcelain of the plug,

this view being partly broken away to show the construction of the said gasket.

In carrying out the invention my improved spark plug is formed with a metalshell 10 provided adjacent its upper extremin the county of Alameda and- 'cclain l5. la n is intended ing material.

be used-without a packing gasket, the shell is formed with a beveled shoulder 12 but since it is sometimes necessary to use a packing gasket. the shell may. as indicated in dotted-lines in Fig. 1. be formed with a flat stop shoulder 13 for receiving such a gasket between the plug and the cylinder of an engine. "At the upper extremity of the reduced portion'ot the shell. the said shell is formed with an internal beveled shoulder 14.

llemovably titted within the shell is a por- As herein used the term' porceto include body similar to the porcelain 15 of any suitable insulat- Adjacent its lower extremity the porcelain is formed with an annular shoulder 16 having a lower beveled face 17 and an upper beveled face 18. Fitted be tween the face 17 of the shoulder and the shoulder '14 of the shell 10 is an annular cushioning gasket 19. This gasketin-cludesas particularly shown in Fig. 52. a hollow casing of copper or other approved material and arranged within the said casing is a preferably asbestos filling 20 providing the cushioning element of the said gasket. Removably fitted over the upper extremity of the porcelain to overlie the beveled face 18 of the shoulder 16 is a substantially cup-shaped gasket 21. shown in detail in Fig. 3 of the drawings. lnterposed between the gasket and the said face is a cushioning ring 22 'which is also preferably of asbestos. Screw threaded into the upper extremity of the shell 10 and loosely surrounding the porcelain is aslceve or nut 23 engaging a 'ound the upper extremity of the gasket 21 and adjustable for tightly connecting the porce lain with the shell 10. It will accordingly be observed that the porcelain will thus be held between the

gaskets

14 and 21 which will. in connecting with the cushioning ring 22. act to cushion the porcclainaipon the shell and thus tend toprcvent the breaking or (racking thereof by the expansion or contraction of theshell or porcelain.

Fitted through the porcelain 15 is a main or energized electrode 24, the upper extremity of which is bent; to provide a laterally directed contact terminal 25' overlying the upper end of the porcelain. F itted through the porcelain to extend in parallel-espaced relation to the main electrode 24 is a neutral electrode 26 formed with a crimped upper terminal 27. The terminal 27 of this electrode is received within a recess 28 in the porcelain 15 and arranged within the said recess is a'plastic filler 29 engaging with the crimped terminal 27 of the electrodefor securely connecting the said electrode with the orcelain. Mounted upon the lower extremity of the shell 10 is a ground electrode 30 heat to extend toward the electrode 26 as is also the adjacent extremity of the main electrode 24 and in this vconnectionitwill be observed that the neutral electrode is'substantially one and a half times the diameter of either the main electrode or the ground electrode. Fitting over the upper end of the porcelain 15 is a metal cap 31 recessed-to receive the contact terminal 25 of the main electrode 24 and seating against the upper terminal I of the porcelain. #The free edge of this cap standing from the cap is a binding post 34: and screw threaded upon this post is a bindling nut 35 for connecting a circuit wire with is pressed into an annular channel 32 in the upper extremity of the porcelain for securely connecting the cap thereto. Arranged within the said recess of the cap to surround the Contact terminal 25 is a. plastic filler 33 acting to firmly seat the cap and hold the said terminal in engagement therewith. Up-

fi ed snark. A douole sparknvill thus be produced. Furthermore, by forming the neutral electrode 26 of larger diameter than the other electrodes. a spark of correspondingly increased volume will be had at each ofthe spark aps .veen the main and ground electro es and the neutral electrode while at the same time the dura'bilit of the neutral electrode will also be enhanced. Also, it will be further noted that owing to theprovision of the contactteri'ninal 25 at the upper end .of the main electrode 24, a correspond ingly increased bearing area between the said terminal and the ca 31 will be obtained so that eilicient electrical connection between. the binding post 34 and themain electrode will at all times be had.

It -will therefore be seen that I provide a particularly efiicient construction for the purposes set forth and a spark plug which will prove thoroughly practicalin use while at the same time the plug is characterized by simplicity of structure and may thus be manufactured at moderate cost.

Having thus described the invention, what 6 is claimed as new is:

A device of the character described including a shell, a groundelectrode connected thereto, a.porcelain mounted upon the shell and provided with a recess, a main clectrode mounted upon the porcelain, a new tral electrode carried by the porcelain to cooperate with the main and ground electrodee l and provided with a crimped upper terminal received within said recess, a filler with- 7 5 in said recess and engaging the said crimped terminal for rigidly connecting the neutral electrode with the porcelain.

In testimony whereof I aflix my signature.

EDMUND O. SATHER. [as]