Patent US4146759A successfully refreshed from Google Patents.
US4146759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition distributor
Assignee: Nissan Motor Co Ltd
•
Filing: 1977-08-10
•
Granted: 1979-03-27
•
Expires: 1997-08-10
Abstract
Abstract An ignition distributor for automotive vehicles comprises a shaft, a rotor arm mounted on the shaft for rotation therewith, a stationary center electrode mounted coaxially with the shaft, and a plurality of angularly spaced stationary outer electrodes. A contact member is secured to the rotor arm which extends between the center of the shaft and a point adjacent to the outer electrode and comprises a baseplate secured to the rotor arm and a resistive film secured to the baseplate, the latter being in electrical contact with the center electrode and in radially inwardly spaced from the outer electrode such that a sudden breakdown of air occurs when the outer end of the contact plate is positioned in proximity to the outer electrode generating an electric discharge. The baseplate is composed of a material having lower electrical conductivity than that of the resistive film so that a distributed constant RC transmission path is formed along the passage of the discharge current.
Inventors
- 👤 Akikazu Watanabe
- 👤 Kazuyoshi Okada
- 👤 Masazumi Sone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:27
CPC Classifications
F; F02; F02P; F02P7/00; F02P7/02; F02P7/021; F02P7/025
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
145 words
An ignition distributor comprising, a metallic rotary shaft, a laterally extending metallic arm mounted on said shaft for unitary rotation therewith, a stationary center electrode disposed coaxially with said shaft, at least one stationary outer electrode spaced from the edge of said lateral arm to define an air gap therewith, a baseplate overlying a surface of said lateral arm, a resistive film secured to said baseplate and in electrical contact with said center electrode, wherein the electrical conductivity of said baseplate is lower than that of said resistive film so that a distributed constant RC circuit is defined by said resistive film, said baseplate and the metallic parts of said distributor including said metallic lateral arm and said rotary shaft to carry an electric current resulting from a spark discharge generated across said air gap in response to said arm rotating past said outer electrode.
Claim 2
Dependent Claim
145 words
An ignition distributor comprising, a metallic rotary shaft, a laterally extending metallic arm mounted on said shaft for unitary rotation therewith, a stationary center electrode disposed coaxially with said shaft, at least one stationary outer electrode spaced from the edge of said lateral arm to define an air gap therewith, a baseplate overlying a surface of said lateral arm, a resistive film secured to said baseplate and in electrical contact with said center electrode, wherein the electrical conductivity of said baseplate is lower than that of said resistive film so that a distributed constant RC circuit is defined by said resistive film, said baseplate and the metallic parts of said distributor including said metallic lateral arm and said rotary shaft to carry an electric current resulting from a spark discharge generated across said air gap in response to said arm rotating past said outer electrode.
Claim 3
Dependent Claim
24 words
An ignition distributor as claimed in claim 1, wherein said baseplate has a higher melting point than the melting point of said resistive film.
Claim 4
Dependent Claim
17 words
An ignition distributor as claimed in claim 2, wherein said baseplate is formed of a metallic oxide.
Claim 5
Dependent Claim
15 words
An ignition distributor as claimed in claim 3, wherein said metallic oxide is aluminum oxide.
Claim 6
Dependent Claim
15 words
An ignition distributor as claimed in claim 3, wherein said metallic oxide is beryllium oxide.
Claim 7
Dependent Claim
17 words
An ignition distributor as claimed in claim 2, wherein said baseplate has a property of high permeability.
Claim 8
Dependent Claim
15 words
An ignition distributor as claimed in claim 6, wherein said baseplate is formed of ferrite.
Claim 9
Dependent Claim
24 words
An ignition distributor as claimed in claim 1, wherein said resistive film is formed of a mixture compound comprising ruthenium oxide and glass frit.
Claim 10
Dependent Claim
24 words
An ignition distributor as claimed in claim 1, wherein said resistive film is formed of a mixture compound comprising silver, palladium and glass frit.
Claim 11
Dependent Claim
33 words
An ignition distributor as claimed in claim 1, further comprising an electrical conductive member on said baseplate adjacent to said outer electrode and in electrical contact with one end of said resistive film.
Claim 12
Dependent Claim
25 words
An ignition distributor as claimed in claim 10, wherein said conductive member and baseplate include a plurality of segmented sections extending toward said outer electrode.
Claim 13
Dependent Claim
38 words
An ignition distributor as claimed in claim 11, further comprising a second electrical conductive member on said baseplate and in electrical contact with said center electrode and in electrical contact with the opposite end of said resistive film.
Claim 14
Dependent Claim
31 words
An ignition distributor as claimed in claim 12, wherein each of said first and second electrical conductive members is formed of a metallic compound comprising a mixture of silver and palladium.
Claim 15
Dependent Claim
31 words
An ignition distributor as claimed in claim 12, wherein each of said first and second electric conductive members is formed of a metallic compound comprising a mixture of platinum and silver.
Claim 16
Dependent Claim
23 words
An ignition distributor as claimed in claim 13, further comprising a brass member secured to each of said first and second metallic members.
Claim 17
Dependent Claim
23 words
An ignition distributor as claimed in claim 13, further comprising an aluminum member secured to each of said first and second metallic members.
Claim 18
Dependent Claim
26 words
An ignition distributor as claimed in claim 1, wherein said resistive film has a longer electrical path than the distance between said center and outer electrodes.
Claim 19
Dependent Claim
16 words
An ignition distributor as claimed in claim 17, wherein said resistive film has a meandering shape.
Claim 20
Dependent Claim
17 words
An ignition distributor as claimed in claim 17, wherein said resistive film has a substantially spiral pattern.
References Cited (Backward Citations)
US2037524A
Cited
US2790020A
Cited
US2818354A
Cited
US3361886A
Cited
US3474304A
Cited
US3501600A
Cited
US3914514A
Cited
US4039787A
Cited
US4007342A
Cited
US4053866A
Cited
US4043030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-26 | 1982-09-25 | 1983-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-26 | 1986-09-25 | 1987-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-26 | 1990-09-25 | 1991-03-27 | $7700.00 | Window Closed / Lapsed |