US996410A

US996410A - Spark-plug.

Info

Publication number: US996410A
Application number: US58939910A
Authority: US
Inventors: Fred E Harpst
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-10-27
Filing date: 1910-10-27
Publication date: 1911-06-27
Anticipated expiration: 1928-06-27

Description

F. E. HARPST.

SPARK PLUG.

APPLICATION FILED 00T-. 27,1910.

Patnted June 27,1911.

Snow whoa [1%505Zf has special reference to a spark tion consists in general I --m the accompanying drawings,

- mg a contracted enable the plug to FEED E. HARPST, OF HOUSTQN, TEXAS.

SPARK-PLUG.

Specification of Letters Patent.

Application filed October 27, 1910. Serial No. 589,399.

To all whom it may concern:

Be it known that I, FRED E. HARPST, a citizen of the United States, residing at Houston, in the county of Harris, State of Texas, have invented certain new and useful Improvements in Spark-Plugs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in .the art to which it appertains to make and 7 use the same.

relates to spark plu s and plug or use with internal combustion motor known fact; that much trouble This invention It is a well is experienced through the cracking of the porcelain insulator commonly used in spark plugs, this cracking being brought about by the intense heat conditions of the plug when t e engine is running. L y The principal object of the present invention is .to provide a device of this character wherein the porcelain will at all times be kept cool. Thesecond object of the invention is to provide means for keeping the terminals clean this being accomplished bycausing a current of. air or gas from carbureter to pass through check valve then aroundinsuatorand down through spark ap.

With the above'andother objects in view, aswill be hereinafter apparent the invenof certainnovel dc; tails of construction and combinations of parts hereinafter fully described, illustrated and specifically set forth in the claims. t r

In the accompanying drawings, like'char-f acters of reference indicate like parts in the several views, and Figure 1 is a vertical sec-- tion of'a spark plug constructed in accord- .ance with this invention, 2 is a section on theline 2-2 of Fig.1. i The spark plug comprises a shell 10 which isthreadedat oneend as at 11 to permitits being,screwed into thecombustion chamber of, the engine. Theother end of theplug is provided with the usual polygonal nut 12 to be grasped with a wrench. The plug has a bore extending from one end tothe'othe'r end, and this bore consistsof .a lower or inner portion 13 havortion 14 immediatel thereabove. Ju'st above the contracted portion the bore is again widened out, as shown; at 15, and terminates at its upper end a plug by means of a 'carbureter at such that the mixture -two being so arrantg tion 19 fits the reduced portion 14 of the bore and extends within the portion 13 of both but terminates at a point greatly removed from the threaded end of the shell. Between the end threaded end 11 is surrounded by radiator fins 20. Surrounding the upper end of the portion 13 of the bore is an annular chamber 21 which communicates with. small openings or perforations 22. Projecting from one side of the shell is a lug 23 which is hollow and threaded internally. The hollow of this lug communicates with the annular chamber 21 by means of a passage 24. Within this hollow screwed a valve cage 25 containing a ball valve 26 and spring 27 so arranged as to permit the passage of air and gas inward but to prevent the exploded charge frompassing 0utward.- The valve cage is held at the inner end of the hollow, and the remaining threads are utilized to connect the spark pipe not deemed necessary tobe shown to the intake manifold or a point as to, be below the throttle in same. Through the side wall of this portion 23 there is provided a small p n hole 27' for the purpose of admitting air during the suction stroke of the engine so ball valve will have an excess of air. 7

' Extending through the insulator 1s a long terin'inal 28 which is arrang side wall of thebore is a term1nal 29 the ed that a gap is formed he terminal 28 andthe etween the side 0 end of the terminal vided with the usual with-the ordinary thum nut -32 between which and the nut 31 the'end'o'f the con"- ductor wire is clamped. v r v 'QIt is to be particularly noted that the location of the a r "such that-with each suction strokefoftthe' 1 v of carbureted air in'whichan excess of air'is drawn in andthat" this chargepassing in through the ball valve inner end of the; insulator is englnef'a c harge here 1s 29.- The plugis pro-j packing or backin nut "30 and terminal adjustin .nut' 31 aswe as' Patented June 2'7, 1911.- I

of the insulator 19 and the of the spark plug the shell the bore by series of portion is which passes throughi'the .95 ed axiallypf the bore and extending radlally from the loo follows around the annular chamber and passes through the opening 22 so that the entire inner end of the insulator is surrounded by'a sheath of cool air or gas. It is-further to be observed that this incoming air or gas is kept cool by reason of the fact that the heat from the inner end of the spark plug is radiated away from the upper end by means of the fins 20. This incoming charge sweeping through the gap of the-terminals effectually blows off any deposit of carbon or soot and keeps the. terminals in proper conditions for sparking at all times. Finally the remote position of the end of the insulator from the inner end of the spark plug prevents the flame of the explosion from backing up intothe bore 13 and depositing soot on the cold porcelain with the consequence that the passage surrounding the same becomes choked.

There has thus been provided a simple and efficient device of the kind described and for the purpose specified.

What is claimed is -1. In a sparking plug, a shell provided with a'bore extending therethrough and having an annular chamber at one end spaced from and surrounding said bore, .an insulator extending into said bore and having its inner end in spaced relation to. the bore and termmatmg ad acent said chamber whereby air entering the chamber will impinge upon the insulator,..a projection on one side of said shell opposite said annular chamber, said projection having a hollow body communicating withsaid chamber, a check valve held in said projection, and

- sparking terminals supported by said insulator and the inner endof the shell.

2. In a spark plug, a shell rovided with a bore extending therethrough and having an annular chamber at one end spaced from and surrounding said bore, said shell being provided with a series of openings between the chamber and the bore, an insulator extending into said bore and having its inner end in spaced relation to the bore and terminating adjacent said'openings whereby air entering the openings will impinge upon the insulator, said shell opposite said annular chamber, said projection having a hollow body communicating with said chamber, a check valve a projection on one side ofheld in said projection, said projection being threaded for connection to a pipe and having a radial opening communicating from the exterior to the hollow portion, and

sparking terminals carried by said insulator and the inner end of said shell.

3. In a spark plug, a shell provided with a bore extending therethrough and having an annular chamber at one end spaced from and surrounding said bore, said shell being provided with a series of openings between the chamber and the bore, an insulator extending into said bore and having its inner end in spaced relation to the bore and terminating adjacent s'aidiopenings whereby air entering the openings will impinge upon the-insulator, a projection, on one side of the shell opposite said annular chamber, said projection having ahollow body communicating with said chamber, a check valve I held in said projection, said projection being threaded for connection to a pipe and having a radial opening communicating from' the exterior to the hollow ortion, sparking terminals carried by said insulator and the in'ner end of said shell, and radiator fins surrounding said shell between the insulator and the inner end of the shell.

In testimony whereof, I aflix my signature, in presence of two Witnesses.

FRED E. HARPST.

Witnesses: I WJD. STEPHENS,

, R. V. SoLoMoN.