Abstract: An economically manufacturable self cleaning spark plug which utilizes combustion gas flow effectively to keep the tip of the plug clean and retains gap spacing indefinitely thereby assuring long spark plug life.

Abstract: An electrical igniter device for a gas turbine includes a conductive tubular shell having a spark electrode section and an integral body section with an open breach end and a conductive sleeve coaxial with the body section for coaxially supporting one end of a helical spring. Means are described for retractably supporting the shell, sleeve and spring within a protective cylinder wherein the pressure in the combustion chamber exceeds the force exerted by the spring.

Abstract: An electrical igniter device for a combustion apparatus such as a gas turbine comprises a unitary tubular conductive shell into which an assembly of coaxially arranged ingniter components are breech loaded. A spark electrode and a terminal extension are positioned in electrical contact within a hollow electrode insulator in the assembly. The electrode insulator is longitudinally positioned in the device between an internal shoulder in the shell and a removable retaining sleeve. The retaining sleeve is in turn held in position against the electrode insulator by an end coupling which is threaded into the breech end of the shell. An external lead connected to the end coupling transmits an electrical charge through the coupling to the shell. Inwardly extending tabs formed off the end of the shell opposite the breech end, together with the spark electrode within the shell, define a spark gap.

Abstract: A spark plug cap is provided for use on a spark plug of an internal combustion engine to intensify sparking across the gap between central and ground electrodes of the plug. The spark plug cap includes a cap body which comprises upper and lower insulating body sections detachably interconnected together. The upper body section is provided with a terminal head adapted to be connected to an ignition current supply cord, while the lower body section with a connector socket for mechanically connecting the cap to the spark plug. A conductor rod extend through the cap body to electrically connect the terminal head with the center electrode of the spark plug. At least one capacitor unit is supported within the cap body and connected in parallel to the spark gap between the plug electrodes. The capacitor unit includes a cylindrical dielectric and a pair of electrodes positioned on the opposite end faces of the cylindrical dielectric.

Abstract: A spark plug cap for use on a spark plug of an internal combustion engine to much intensify sparking across the gap between central and ground electrodes of the spark plug. The spark plug cap includes an insulating body having a connector provided at its one end for mechanically connecting the cap to the spark plug. An electrical conductor extends through the insulating body for supplying high-tension ignition current to the central electrode of the spark plug. At least one capacitor unit is supported within the insulating body and electrically connected across the gap between the spark plug electrodes.

Abstract: A spark plug and connector assembly having a spark gap formed from two electrodes which are both electrically isolated from ground. The spark plug includes an insulator mounted in a tubular metal shell having a threaded end for engaging a corresponding opening into a combustion chamber in an internal combustion engine. The two electrodes are mounted within separate parallel bores through the insulator. Each electrode has a tip projecting from the insulator for defining the spark gap. The electrodes also have terminal ends which are recessed within the insulator bores. The electrode terminal ends are centered within and spaced from the walls of the bores. Tubular connectors attached to the ends of two high-voltage ignition cables are received within the insulator bores and slide telescopically onto the electrode terminal ends. The connectors are also recessed within the insulator bores to prevent arcing therebetween.