US3604864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Point contact mounting for ignition distributors
Assignee: Ducellier et Cie
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Filing: 1970-02-18
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Granted: 1971-09-14
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Expires: 1990-02-18
Abstract
Abstract Pitting of the ignition contacts of an ignition distributor is avoided by effecting relative displacement or wiping action between the fixed and movable contacts. The wiping action is achieved by shifting the breaker arm axially on its pivot shaft in response to variations in the intake manifold pressure of the associated internal combustion engine. The contacts may therefore be associated with a distributor which does not employ manifold or vacuum advance characteristics. When the breaker arm pivot shaft is parallel to the distributor rotor shaft, provision of helically extending lobes on the distributor cam will also effect advance-retard characteristics in response to axial movement of the breaker arm on its pivot shaft. Alternatively, with a distributor cam having lobes extending parallel to the axis of the rotor shaft, inclination of the pivot shaft for the breaker arm likewise effects the advance-retard characteristics. In all arrangements, axial shifting of the breaker arm on its pivot shaft effects a wiping action between the fixed and movable contacts.
Inventors
- 👤 Roger Jean Habert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:04
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/10; F02P5/103; F02P7/00; F02P7/06; F02P7/063
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
In an ignition distributor having a rotor shaft, a cam driven by said shaft, and a breaker plate adjacent the level of said cam, in combination, a fixed ignition point contact carried by said breaker plate, a breaker pivot shaft on said breaker plate, a breaker arm pivotally mounted on said pivot shaft having a contact remote therefrom for make and break engagement with said fixed contact and having a rubbing block engageable by said cam, and means for shifting said breaker arm axially of said pivot shaft to cause relative movement between said fixed contact and said breaker arm contact for cleaning the contacts and for varying the ignition timing as a function of the vacuum as responsive to a function of the engine load.
Claim 2
Dependent Claim
126 words
In an ignition distributor having a rotor shaft, a cam driven by said shaft, and a breaker plate adjacent the level of said cam, in combination, a fixed ignition point contact carried by said breaker plate, a breaker pivot shaft on said breaker plate, a breaker arm pivotally mounted on said pivot shaft having a contact remote therefrom for make and break engagement with said fixed contact and having a rubbing block engageable by said cam, and means for shifting said breaker arm axially of said pivot shaft to cause relative movement between said fixed contact and said breaker arm contact for cleaning the contacts and for varying the ignition timing as a function of the vacuum as responsive to a function of the engine load.
Claim 3
Dependent Claim
19 words
In the ignition distributor as defined in claim 1 wherein said pivot shaft is parallel with said rotor shaft.
Claim 4
Dependent Claim
69 words
In the ignition distributor as defined in claim 1 wherein said pivot shaft is inclined with respect to the axis of said rotor shaft whereby said axial shifting of said breaker arm also effects change in the make and break timing of said contacts for cleaning the contacts and for varying the ignition timing as a function of the vacuum as responsive to a function of the engine load.
Claim 5
Dependent Claim
45 words
In the ignition distributor as defined in claim 1 wherein said cam is provided with lobes extending helically of the axis of said rotor shaft whereby said axial shifting of the breaker arm also effects change in the make and break timing of said contacts.
Claim 6
Dependent Claim
82 words
An ignition distributor comprising a rotatable cam, a fixed ignition contact and a breaker arm, said breaker arm being pivotally mounted remote from said fixed contact and having a contact engaging said fixed contact, said breaker arm also including a rubbing block engageable by said cam for pivoting said breaker arm in a predetermined plane away from said fixed contact, and means for shifting said breaker arm back and forth perpendicular to said plane to effect relative wiping action between said contacts.
Claim 7
Dependent Claim
82 words
An ignition distributor comprising a rotatable cam, a fixed ignition contact and a breaker arm, said breaker arm being pivotally mounted remote from said fixed contact and having a contact engaging said fixed contact, said breaker arm also including a rubbing block engageable by said cam for pivoting said breaker arm in a predetermined plane away from said fixed contact, and means for shifting said breaker arm back and forth perpendicular to said plane to effect relative wiping action between said contacts.
Claim 8
Dependent Claim
26 words
An ignition distributor as defined in claim 5 wherein said means includes a bellcrank engaging said breaker arm and a link for oscillating said bell crank.
Claim 9
Dependent Claim
23 words
In the ignition distributor as defined in claim 6 including a compression spring bearing against said breaker arm in opposition to said bellcrank.
Claim 10
Dependent Claim
44 words
The ignition distributor as defined in claim 5 wherein said breaker arm is shifted parallel to the axis of said cam, said cam having helical lobes whereby said shifting of the breaker arm also effects variation in the ignition advance characteristic of said contacts.
Claim 11
Dependent Claim
52 words
The ignition distributor as defined in claim 5 wherein said breaker arm is shifted along an axis inclined with respect to the axis of said cam, said cam having lobes parallel to its axis whereby said shifting of the breaker arm also effects variation in the ignition advance characteristic of said contacts.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |