US3948238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stressing mechanism for a piezoelectric ignition system
Assignee: Individual
•
Filing: 1974-10-07
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Granted: 1976-04-06
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Expires: 1994-10-07
Abstract
Abstract Mechanism is provided for activating a piezoelectric crystal used to produce a spark at a plug fitted to the cylinder of an internal combustion engine. The mechanism has a striker for delivering current-generating blows to the crystal and this striker is coaxially mounted with respect to a driven shaft of the engine such as the crank shaft or cam shaft. Cam means connects the striker to a rotor which is driven by the shaft through drive means including a one-way clutch. The striker is reciprocated in timed relation to rotation of the driven shaft and can be rotated about its own axis by a device which is operated to vary the timing of the spark in accordance with the speed of the engine.
Inventors
- 👤 Frederick T. Jamieson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:18
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
88 words
Mechanism for stressing a piezoelectric crystal used in the ignition system of an internal combustion engine having a driven shaft, comprising a striker movably mounted in axial alignment with the driven shaft and having a head adjacent the crystal, a rotor rotatably mounted in juxtaposition with the striker, drive means operatively connecting the rotor to the driven shaft for rotation therewith, and cam mean interconnecting the striker and the rotor whereby the crystal receives current-generating blows from the head in timed relation to rotation of the driven shaft.
Claim 2
Dependent Claim
88 words
Mechanism for stressing a piezoelectric crystal used in the ignition system of an internal combustion engine having a driven shaft, comprising a striker movably mounted in axial alignment with the driven shaft and having a head adjacent the crystal, a rotor rotatably mounted in juxtaposition with the striker, drive means operatively connecting the rotor to the driven shaft for rotation therewith, and cam mean interconnecting the striker and the rotor whereby the crystal receives current-generating blows from the head in timed relation to rotation of the driven shaft.
Claim 3
Dependent Claim
31 words
Mechanism as claimed in claim 1, and including timing means operating automatically and according to engine speed for controlling the timing of the blows delivered to the anvil by the head.
Claim 4
Dependent Claim
38 words
Mechanism as claimed in claim 1, in which said drive means includes a clutch adapted to disengage the rotor from the driven shaft when said shaft is rotated in a direction opposite to a normal direction of rotation.
Claim 5
Dependent Claim
135 words
Mechanism for stressing a piezoelectric crystal used in the ignition system of an internal combustion engine having a driven shaft, comprising a striker for the piezoelectric crystal mounted for reciprocatory and non-rotational movement in coaxial alignment with the driven shaft, a rotatably mounted rotor coaxially aligned with the driven shaft and the striker, drive means operatively connecting the rotor to the driven shaft, said striker having a flange, said rotor having a wall adjacent the flange, cam means between the striker flange and the rotor wall for converting rotational movement of the rotor to reciprocatory movement of the striker, and timing means operatively connecting the striker to throttle linkage of the engine whereby the timing of the blows delivered to the crystal by said striker is varied according to rotational speed of the driven shaft.
Claim 6
Dependent Claim
135 words
Mechanism for stressing a piezoelectric crystal used in the ignition system of an internal combustion engine having a driven shaft, comprising a striker for the piezoelectric crystal mounted for reciprocatory and non-rotational movement in coaxial alignment with the driven shaft, a rotatably mounted rotor coaxially aligned with the driven shaft and the striker, drive means operatively connecting the rotor to the driven shaft, said striker having a flange, said rotor having a wall adjacent the flange, cam means between the striker flange and the rotor wall for converting rotational movement of the rotor to reciprocatory movement of the striker, and timing means operatively connecting the striker to throttle linkage of the engine whereby the timing of the blows delivered to the crystal by said striker is varied according to rotational speed of the driven shaft.
Claim 7
Dependent Claim
38 words
Mechanism as claimed in claim 4, in which said drive means includes a clutch device adapted to transmit drive between the driven shaft and the rotor only in response to rotation of said shaft in a predetermined direction.
References Cited (Backward Citations)
CA669329A
Cited
CA670205A
Cited
US2717916A
Cited
US2871280A
Cited
US3082333A
Cited
US3229154A
Cited
US3737691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |