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US 5,642,721 AGranted
Double ignition system for internal combustion engines, ignition plug for double ignition systems, and electric spark generator
OwnerKaname Ikeyainventor
Life of this patent
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Abstract
A double ignition spark plug has a cavity which is evacuated of substantially all gasses. The insulation portion of the spark plug is formed in two steps at a temperature of 800.degree. to 1000.degree. C. where the first sintering step is when the cavity is open and a first conductor is in place, and a second sintering step is effective to close the cavity and fix a second conductor in place. At least the second sintering step is conducted in a vacuum. The completed double ignition spark plug has substantially all gasses removed from the spark gap within the insulator.
Claims10
A double ignition spark plug constructed by a process comprising the steps of:
- making an iron base;
- forming an insulator extending through said iron base;
- forming an ignition spark gap at said iron base by extending a first conductor through said insulator and extending towards a portion of said iron base;
- forming a cavity in said insulator;
- extending said first conductor into said cavity;
- extending a second conductor into said cavity and forming a space between said first and second conductors within said cavity;
- evacuating said cavity of substantially all gases;
- providing a connecting terminal on said insulator;
- and connecting said second conductor to said conducting terminal.
6 more elements
Dependencies are inferred from the claim text.