US3826236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition system for internal combustion engines
Assignee: Svenska Electromagneter AB
•
Filing: 1972-09-28
•
Granted: 1974-07-30
•
Expires: 1992-09-28
Abstract
Abstract An ignition system has a capacitor charged by a magneto, and switch means responsive to magneto rotation and connected across said magneto for terminating charging of the capacitor before the capacitor is fully charged.
Inventors
- 👤 H Carlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:23
CPC Classifications
F; F02; F02P; F02P1/00; F02P1/08; F02P1/086
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
114 words
An ignition system for an internal combustion engine, comprising: a. an ignition coil having primary and secondary windings, said secondary winding being arranged to be connected in circuit with a spark plug; b. a magneto for generating unidirectional charging pulses in response to engine rotation; c. a discharge capacitor connected in series between said magneto and said primary winding; d. each charging pulse having a peak value of voltage at least equal to the charging voltage of said capacitor at the slowest engine operating speed; and e. switch means responsive to magneto rotation and connected across said magneto for terminating charging of said capacitor during higher operating speeds before said capacitor is fully charged.
Claim 2
Dependent Claim
114 words
An ignition system for an internal combustion engine, comprising: a. an ignition coil having primary and secondary windings, said secondary winding being arranged to be connected in circuit with a spark plug; b. a magneto for generating unidirectional charging pulses in response to engine rotation; c. a discharge capacitor connected in series between said magneto and said primary winding; d. each charging pulse having a peak value of voltage at least equal to the charging voltage of said capacitor at the slowest engine operating speed; and e. switch means responsive to magneto rotation and connected across said magneto for terminating charging of said capacitor during higher operating speeds before said capacitor is fully charged.
Claim 3
Dependent Claim
45 words
An ignition system according to claim 1 in which said magneto has a series of permanent magnets successively operative to produce pulse increments which jointly comprise one of said charging pulses, each such increment having a peak voltage below said charging voltage of said capacitor.
Claim 4
Dependent Claim
48 words
An ignition system according to claim 1 in which said switch means comprise a pair of relatively movable electrical contacts, and a cam arranged to be rotated with the rotatable portion of said magneto by a shaft on the magneto for controlling opening and closing of said contacts.
Claim 5
Dependent Claim
42 words
An ignition system according to claim 1 in which said switch means compise a normally non-conductive thyristor connected directly between said capacitor and the low-voltage side of said magneto, and a trigger coil in said magneto connected to render said thyristor conductive.
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |