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Primary Examiner: Scott, James R.
Assistant Examiner:
Attorney: Stahr; Richard G.

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Title: Ignition distributor rotor having a silicone varnish coated output segment for suppressing noise and a method of manufacture therefor

Abstract: The output segment of an ignition distributor rotor having an output segment and a spring contact member in series is coated with a silicone varnish dielectric material for effecting the suppression of radio frequency interference radiation and, to establish an electrical connection between the ignition distributor rotor spring contact member and the silicone varnish coated rotor output segment, a potential is applied across the spring contact member, the rotor output segment and an air gap in series and of a sufficient level to overstress the dielectric strength of the silicone varnish material to thereby effect a rupture of the silicone varnish material to establish an electrical connection through electrical arcing between the spring contact member and the rotor output segment.

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Inventors: Sprague, Richard L. (Anderson, IN, US)

Application Number: 963089
Filing Date: 1978-11-22
Publication_date: 1980-06-17
Assignee: General Motors Corporation (Detroit, MI)
Primary Class(es): 200/19.33 29/622, 29/825, 123/146.5A, 200/238
Other Classes:
US Patent Ref:

2227972	Jan, 1941	Hood et al.	200/19.
3277268	Oct, 1966	Williams et al.	219/91.
3418444	Dec, 1968	Ruehlemann	219/91.
3887780	Jun, 1975	Crim	200/19.
3941107	Mar, 1976	Rockwell	200/19.
4007342	Feb, 1977	Makino et al.	200/19.
4031284	Jun, 1977	Ingraham	174/6.
4039787	Aug, 1977	Hori et al.	200/19.
4074090	Feb, 1978	Hayashi et al.	200/19.
4082926	Apr, 1978	Marks et al.	200/19.

Other Refs: Other References: Kofoid, M. J.; "Phenomena at the Metal-Dielectric Junctions of High-Voltage Insulators in Vacuum and Magnetic Field"; AIEE Transactions, Dec. 1960; vol. 79(3), pp. 991-999.
Kofoid, M. J.; "Effect of Metal-Dielectric Junction Phenomena On High-Voltage Breakdown Over Insulators in Vacuum"; AIEE Transactions, Dec. 1960; vol. 79(3), pp. 999-1004.