Secondary ignition lead structure
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United States of America Patent
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Apr 29, 1997
Grant Date -
N/A
app pub date -
Dec 13, 1994
filing date -
Dec 13, 1994
priority date (Note) -
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Abstract
A high-voltage lead intended for use in ignition systems of engines, typically large engines, the lead having an inner insulated conductor surrounded either by an inner conductive sleeve and an outer insulating sleeve, or by a single insulating sleeve with a conductive layer on its inner surface. The conductive sleeve or conductive layer, which is preferably non-metallic, provides shielding but permits the use of conventional pickup devices to detect electrical pulses in the lead and thereby monitor engine performance with the use of a timing light, oscilloscope or similar device. The presence of two insulating layers provides a desired measure of safety in the presence of an explosive gas and air mixture. The conductive layer provides both shielding and static electricity discharge. The structure of the invention is less expensive than ignition leads with conventional braided stainless steel shielding, and requires less effort and cost to maintain in safe condition.
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