Body controlled heat range and extended gap spark plug

Claim 2

A heat range controlling spark plug for extending the spark gap to an optimum ignition point away from the combustion chamber wall, and including; an integral heat conductive body comprised of an outer drive section and an intermediate reach section and an inner nose section, there being a bore extending through said body sections, an insulator comprised of a dielectric engageably carried in the bore with a stem portion projecting from the drive section of the body and with a nose portion projecting through the reach and nose sections of the body, there being a bore extending through said insulator body, and an electrode extending through the last mentioned bore and with an outermost terminal end exposed at the stem portion of the insulator and with another innermost end exposed at the terminal end of the nose portion of the insulator, the reach portion of the body having heat conductive threads for mounting engagement through a combustion chamber wall, and the nose section of the heat conductive body being of cylindrical tube form extended protectively over the insulator nose portion and with a predetermined fineness to length ratio determinative of heat transfer therethrough and dissipation thereof into the intermediate reach section and projecting into said combustion chamber with an electrode at its innermost terminal end opposed to the said other innermost end of the first mentioned electrode.

Claim 3

The heat range and extended gap spark plug as set forth in claim 1 wherein the cylindrical tube form of the nose section has a wall of tapered heat controlling configuration.

Claim 4

The heat range and extended gap spark plug as set forth in claim 1 wherein the nose section has a convexly shaped terminal end heat controlling configuration.

Claim 5

The heat range and extended gap spark plug as set forth in claim 1 wherein the nose section has a concavely shaped terminal end flame propagation configuration.

Claim 6

The heat range and extended gap spark plug as set forth in claim 1 wherein the diametral terminal end of the nose section is ribbed.

Claim 7

The heat range and extended gap spark plug as set forth in claim 1 wherein the nose section has radially disposed involutely curved ribs projecting from its terminal end.

Claim 8

The heat range and extended gap spark plug as set forth in claim 1 wherein the electrode at the innermost end of the iNner nose section is comprised of a finger extending radially inward to oppose the said first mentioned electrode.

Claim 9

The heat range and extended gap spark plug as set forth in claim 1 wherein the electrode at the innermost end of the inner nose section is comprised of a bore therethrough spaced concentrically around the said first mentioned electrode forming an air gap therebetween.

Claim 10

The heat range and extended gap spark plug as set forth in claim 1 wherein the insulator is substantially longitudinally coextensive with the inner nose section of the heat conductive body.

Claim 11

The heat range and extended gap spark plug as set forth in claim 1 wherein the insulator is substantially longitudinally coextensive with the inner nose section of the heat conductive body, and wherein the electrode at the innermost end of the inner nose section is comprised of a finger extending radially inward to oppose the said first mentioned electrode.

Claim 12

The heat range and extended gap spark plug as set forth in claim 1 wherein the insulator is substantially longitudinally coextensive with the inner nose section of the heat conductive body, and wherein the electrode at the innermost end of the inner nose section is comprised of the bore therethrough spaced concentrically around the said first mentioned electrode.

Claim 13

A controlled heat range spark plug for extending the spark gap to an optimum ignition point away from the combustion chamber wall, and including; an integral heat conductive body comprised of an outer drive section and in intermediate reach section and an inner nose section, there being a bore extending through said body sections, an insulator comprised of a dielectric engageably carried in the bore with a stem portion projecting from the drive section of the body and with a nose portion projecting through the reach and nose sections of the body, there being a bore extending through said insulator body, and an electrode extending through the last mentioned bore and with an outermost terminal end exposed at the stem portion of the insulator and with another innermost end exposed at the terminal end of the nose portion of the insulator, the reach portion of the body having heat conductive threads for mounting engagement through a combustion chamber wall, and the nose sections of the heat conductive body being of cylindrical tube form having dimensionally predetermined inner and outer diameter walls commensurate with the fineness to length ratio determinative of heat transfer therethrough and dissipation thereof into the intermediate reach section and extended protectively over the insulator nose portion and projecting into said combustion chamber with an electrode at its innermost terminal end opposed to the said other innermost end of the first mentioned electrode.

Claim 14

A controlled heat range spark plug for extending the spark gap to an optimum ignition point away from the combustion chamber wall, and including; an integral heat conductive body comprised of an outer drive section and in intermediate reach section and an inner nose section, there being a bore extending through said body sections, an insulator comprised of a dielectric engageably carried in the bore with a stem portion projecting from the drive section of the body and with a nose portion projecting through the reach and nose sections of the body, there being a bore extending through said insulator body, and an electrode extending through the last mentioned bore and with an outermost terminal end exposed at the stem portion of the insulator and with another innermost end exposed at the terminal end of the nose portion of the insulator, the reach portion of the body having heat conductive threads for mounting engagement through a combustion chamber wall, and the nose sections of the heat conductive body being of cylindrical tube form having dimensionally predetermined inner and outer diameter walls commensurate with the fineness to length ratio determinative of heat transfer therethrough and dissipation thereof into the intermediate reach section and extended protectively over the insulator nose portion and projecting into said combustion chamber with an electrode at its innermost terminal end opposed to the said other innermost end of the first mentioned electrode.

Claim 15

The controlled heat range and extended gap spark plug as set forth in claim 12 wherein the said nose section of the heat conductive body is grooved intermediate its inner and outer extremities for restriction of heat flow.

Claim 16

The controlled heat range and extended gap spark plug as set forth in claim 12 wherein the said nose section of the heat conductive body is grooved spaced from its innermost end with a terminal end portion of the nose section remaining to retain heat and for restriction of heat flow into the said intermediate reach section.

Claim 17

The controlled heat range and extended gap spark plug as set forth in claim 12 wherein the convolutions of the heat conductive threads of the reach section and adjacent to the extended nose section of the heat conductive body are more tightly threaded through the combustion chamber wall than the remaining convolutions thereof.

Claim 18

The controlled heat range and extended gap spark plug as set forth in claim 12 wherein the convolutions of the heat conductive threads of the reach section and adjacent to the extended nose section of the heat conductive body are of greater ptich than the remaining convolutions thereof.

Claim 19

The controlled heat range and extended gap spark plug as set forth in claim 12 wherein the convolutions of the heat conductive threads of the reach section and adjacent to the extended nose section of the heat conductive body are of different pitch than the complementary threads through the combustion chamber wall.

Claim 20

The controlled heat range and extended gap spark plug as set forth in claim 12 wherein the nose section of cylindrical tube form is of enlarged configuration at its terminal end.

Claim 21

The controlled heat range and extended gap spark plug as set forth in claim 12 wherein the nose section of cylindrical tube form is of enlarged convex configuration at its terminal end.

Claim 22

The controlled heat range and extended gap spark plug as set forth in claim 12 wherein the nose section of cylindrical tube form is of enlarged concave configuration at its terminal end.