Patent US4705100A successfully refreshed from Google Patents.
Patent US3832586A successfully refreshed from Google Patents.
US3832586A
Expired / Lapsed
US
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Spark plug
Assignee: Federal Mogul Ignition LLC
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Filing: 1973-05-04
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Granted: 1974-08-27
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Expires: 1993-05-04
Abstract
Abstract The disclosure relates to an improved spark plug assembly, including an improved low inductance spring. The spring is positioned within the bore of a spark plug, either in conjunction with a noise suppression resistor or otherwise. The spring is formed from an elongated resilient conductor which is preferably flat. The spring is shaped into generally an ''''S'''' configuration with a curl at each end.
Inventors
- 👤 R Podiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:42
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/40; H01T13/41
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
129 words
A spark plug for an internal combustion engine having an insulator surrounding a center electrode, a terminal adjacent the upper end of said insulator, an elongated and freely movable conductor spring positioned within the bore of said insulator for maintaining electrical contact between said center electrode and said terminal, said spring formed from a flat elongated conductor and having a longitudinal centerline, two opposed end portions and a central portion, each of said end portions being formed into a spiral curl, the arcuate centerline of each of said spiral curls and the centerline of said central portion lying in a single plane, whereby said spring is free to expand and contract along such centerline as said spiral curls roll and unroll under axial compression during operation of the engine.
Claim 2
Dependent Claim
129 words
A spark plug for an internal combustion engine having an insulator surrounding a center electrode, a terminal adjacent the upper end of said insulator, an elongated and freely movable conductor spring positioned within the bore of said insulator for maintaining electrical contact between said center electrode and said terminal, said spring formed from a flat elongated conductor and having a longitudinal centerline, two opposed end portions and a central portion, each of said end portions being formed into a spiral curl, the arcuate centerline of each of said spiral curls and the centerline of said central portion lying in a single plane, whereby said spring is free to expand and contract along such centerline as said spiral curls roll and unroll under axial compression during operation of the engine.
Claim 3
Dependent Claim
17 words
A spark plug according to claim 1 wherein said spiral curl comprises at least one 360* turn.
Claim 4
Dependent Claim
24 words
A spark plug according to claim 1 wherein said spiral curls extend outwardly from said central portion in opposite directions, generally defining an S-shape.
Claim 5
Dependent Claim
16 words
A spark plug according to claim 3 wherein said spiral curls are of substantially equal size.
Claim 6
Dependent Claim
34 words
A spark plug according to claim 1 wherein an interference suppression resistor is positioned in the bore of said insulator between said center electrode and said terminal, said spring being positioned adjacent said resistor.
Claim 7
Dependent Claim
142 words
A spark plug for an internal combustion engine having an insulator surrounding a center electrode, a terminal adjacent the upper end of said insulator, an elongated and freely movable conductor spring positioned within the bore of said insulator for maintaining electrical contact between said center electrode and said terminal, said spring formed from a flat elongated conductor having a longitudinal centerline, two opposed end portions and a central portion, each of said end portions being formed into a spiral curl, said spiral curls extending outwardly from said central portion in opposite directions and being substantially of an equal size, the arcuate centerline of each of said spiral curls and the centerline of said central portion lying in a single plane, whereby said spring is free to move along such centerline as said spiral curls roll and unroll during operatIon of the engine.
Claim 8
Dependent Claim
142 words
A spark plug for an internal combustion engine having an insulator surrounding a center electrode, a terminal adjacent the upper end of said insulator, an elongated and freely movable conductor spring positioned within the bore of said insulator for maintaining electrical contact between said center electrode and said terminal, said spring formed from a flat elongated conductor having a longitudinal centerline, two opposed end portions and a central portion, each of said end portions being formed into a spiral curl, said spiral curls extending outwardly from said central portion in opposite directions and being substantially of an equal size, the arcuate centerline of each of said spiral curls and the centerline of said central portion lying in a single plane, whereby said spring is free to move along such centerline as said spiral curls roll and unroll during operatIon of the engine.
Claim 9
Dependent Claim
19 words
A spark plug according to claim 6 wherein each of said spiral curls comprises at least one 360* turn.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |