Patent US2869239A successfully refreshed from Google Patents.
US3759237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Igniter for two-cycle multi-cylinder engine
Assignee: Sawafuji Electric Co Ltd
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Filing: 1971-10-22
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Granted: 1973-09-18
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Expires: 1991-10-22
Abstract
Abstract An igniter for a multi-cylinder engine comprises a plurality of ignition circuits each consisting of a breaker, an ignition coil and a spark plug. The circuits are connected in series to one another and to one end of an ignition generator coil of an engine driven magneto. The ends of the ignition circuits and the other end of the ignition generator coil are grounded.
Inventors
- 👤 G Shino
- 👤 K Okamoto
- 👤 K Shimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:51
CPC Classifications
F; F02; F02P; F02P7/00; F02P7/02; F02P7/03; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
169 words
An igniter for a multi-cylinder engine comprising a flywheel assembly secured to an engine crankshaft, a plurality of equally spaced apart magnets arranged in circular fashion on the inside cylindrical surface of the flywheel assembly with each magnet magnetized in a radial direction relative to the engine crankshaft, a stator plate and an ignition generator coil positioned inside the flywheel assembly on the stator plate, a cam fixed to the engine crankshaft, a plurality of breakers fitted on the stator plate constructed and arranged for opening and closing by the cam, a plurality of ignition circuits each having a pair of primary and secondary coils constructed and arranged to generate a high tension voltage through the intermittent opening and closing of the breakers, the primary coils in the ignition circuits being connected to the breakers and the secondary coils being connected to spark plugs, and the breakers of the ignition circuits being connected in series with one end grounded and the other end connected to the ignition generator coil.
Claim 2
Dependent Claim
169 words
An igniter for a multi-cylinder engine comprising a flywheel assembly secured to an engine crankshaft, a plurality of equally spaced apart magnets arranged in circular fashion on the inside cylindrical surface of the flywheel assembly with each magnet magnetized in a radial direction relative to the engine crankshaft, a stator plate and an ignition generator coil positioned inside the flywheel assembly on the stator plate, a cam fixed to the engine crankshaft, a plurality of breakers fitted on the stator plate constructed and arranged for opening and closing by the cam, a plurality of ignition circuits each having a pair of primary and secondary coils constructed and arranged to generate a high tension voltage through the intermittent opening and closing of the breakers, the primary coils in the ignition circuits being connected to the breakers and the secondary coils being connected to spark plugs, and the breakers of the ignition circuits being connected in series with one end grounded and the other end connected to the ignition generator coil.
Claim 3
Dependent Claim
35 words
An igniter for a multi-cylinder engine as in claim 1 wherein the other end of the ignition generator coil is connected to the plus side of a diode, the minus side of which is grounded.
Claim 4
Dependent Claim
39 words
An igniter for a multi-cylinder engine as in claim 1 wherein the junction between the ignition generator coil and the plurality of ignition circuits is connected to one end of a capacitor, the other end of which is grounded.
Claim 5
Dependent Claim
40 words
An igniter for a multi-cylinder engine as in claim 1 wherein the junction between the ignition generator coil and the plurality of ignition circuits is connected to the plus side of a diode, the minus side of which is grounded.
Claim 6
Dependent Claim
40 words
An igniter for a multi-cylinder engine as in claim 2 wherein the junction between the ignition generator coil and the plurality of ignition circuits is connected to the plus side of a diode, the minus side of which is grounded.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |