Electric lamp and discharge devices – Spark plugs – Electrodes are pure figures of revolution about plug axis
Patent
1980-11-03
1983-06-14
Demeo, Palmer C.
Electric lamp and discharge devices
Spark plugs
Electrodes are pure figures of revolution about plug axis
313143, H01T 1320
Patent
active
043885497
ABSTRACT:
A plasma plug for use with an ignition system with improved plasma jet emmision is disclosed. The plasma plug comprises a threaded shell for engagement with an internal combustion engine, an annular ground electrode structurally integral with the shell, an insulator mounted therein, and a center electrode seated within the insulator. The center electrode and the insulator both have firing ends, the former of which is short of the latter and in spark gap relationship with the ground electrode. The insulator has a stepped cavity extending from the firing end of the electrode through the firing end of the insulator and having a cavity of relatively large cross-section adjacent the former and a cavity of smaller cross-section extending through the latter. The ratio of the volume of the large cavity to that of the smaller is from about 100:1 to about 1:1 and the ratio of the length of the large cavity to that of the smaller is from about 1:3 to about 1:1. The walls in the smaller cavity are electrically insulating and the walls in the large cavity are electrically insulating at least in an upper portion adjacent the firing end of the center electrode.
REFERENCES:
patent: 2519273 (1946-04-01), Mitchel
patent: 2840742 (1958-06-01), Watters
patent: 2870376 (1959-01-01), Tognola
patent: 3911307 (1975-10-01), Goto et al.
E. F. Lindsley, "More Miles from a Barrel of Crude", Popular Science, Sep. 1979, reproduction on front cover.
Champion Spark Plug Company
DeMeo Palmer C.
O'Shea Sandra L.
Purdue John C.
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