US3715528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal advance device for an ignition distributor
Assignee: Ducellier et Cie
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Filing: 1971-06-24
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Granted: 1973-02-06
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Expires: 1991-06-24
Abstract
Abstract A centrifugal advance device for an ignition distributor for an internal combustion engine wherein there are provided two main flywheel masses and two auxiliary flywheel masses. The main masses are each pivotable on a pin mounted on a plate which is connected to a drivable shaft and the auxiliary masses are coupled to the main masses. These masses are adapted on rotation of said shaft to displace a plate connected to a cam which is adapted to actuate a contact-breaker arm for obtaining a variation in the timing of the spark. The auxiliary masses are arranged to move the main masses in their angular displacement during a first stage of variation corresponding to a lower region of engine speed. After the engine speed has passed through this lower region, two abutments fixed to the plate connected to the control shaft prevent further angular movement of the auxiliary masses and main masses, thus providing an intermediate region of engine speed during which the timing of the spark does not vary. As the engine speed increases still further into an upper region spring means acting on said masses are overcome to permit further angular movement of the main masses and thus further angular movement of the plate connected to said cam.
Inventors
- 👤 R Habert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:56
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
252 words
A centrifugal advance device for an ignition distributor of an internal combustion engine of the type including a centrifugal governor having rotatable masses which are adapted to angularly displace a plate connected to a cam, said cam being adapted to actuate a contact-breaker arm for obtaining a variation in the timing of the moment of sparking dependent upon engine speed, comprising a rotatable shaft, a plate connected to said shaft, two main flywheel masses, each main mass being pivotable on a pin mounted on said plate connected to said shaft and being operatively connected to said plate so as to angularly displace said plate when said main masses are pivoted on said pins, two auxiliary flywheel masses operatively coupled to said two main flywheel masses, spring means operatively connected between said masses and said plate, and further including two abutments fixed to said plate adjacent the paths of movement of said auxiliary masses, said auxiliary masses abutting said abutments upon moving a first predetermined angular distance jointly with said main masses, said abutments preventing further angular movement of said auxiliary masses, further angular movement of said main masses being prevented by the force of said spring means for a predetermined period of engine speed increase until increasing centrifugal forces acting on said main masses due to increases in the engine speed are sufficient to overcome tension exerted by said spring means to permit further angular movement of said main masses and thus further angular movement of said plate connected to said cam.
Claim 2
Dependent Claim
252 words
A centrifugal advance device for an ignition distributor of an internal combustion engine of the type including a centrifugal governor having rotatable masses which are adapted to angularly displace a plate connected to a cam, said cam being adapted to actuate a contact-breaker arm for obtaining a variation in the timing of the moment of sparking dependent upon engine speed, comprising a rotatable shaft, a plate connected to said shaft, two main flywheel masses, each main mass being pivotable on a pin mounted on said plate connected to said shaft and being operatively connected to said plate so as to angularly displace said plate when said main masses are pivoted on said pins, two auxiliary flywheel masses operatively coupled to said two main flywheel masses, spring means operatively connected between said masses and said plate, and further including two abutments fixed to said plate adjacent the paths of movement of said auxiliary masses, said auxiliary masses abutting said abutments upon moving a first predetermined angular distance jointly with said main masses, said abutments preventing further angular movement of said auxiliary masses, further angular movement of said main masses being prevented by the force of said spring means for a predetermined period of engine speed increase until increasing centrifugal forces acting on said main masses due to increases in the engine speed are sufficient to overcome tension exerted by said spring means to permit further angular movement of said main masses and thus further angular movement of said plate connected to said cam.
Claim 3
Dependent Claim
252 words
A centrifugal advance device for an ignition distributor of an internal combustion engine of the type including a centrifugal governor having rotatable masses which are adapted to angularly displace a plate connected to a cam, said cam being adapted to actuate a contact-breaker arm for obtaining a variation in the timing of the moment of sparking dependent upon engine speed, comprising a rotatable shaft, a plate connected to said shaft, two main flywheel masses, each main mass being pivotable on a pin mounted on said plate connected to said shaft and being operatively connected to said plate so as to angularly displace said plate when said main masses are pivoted on said pins, two auxiliary flywheel masses operatively coupled to said two main flywheel masses, spring means operatively connected between said masses and said plate, and further including two abutments fixed to said plate adjacent the paths of movement of said auxiliary masses, said auxiliary masses abutting said abutments upon moving a first predetermined angular distance jointly with said main masses, said abutments preventing further angular movement of said auxiliary masses, further angular movement of said main masses being prevented by the force of said spring means for a predetermined period of engine speed increase until increasing centrifugal forces acting on said main masses due to increases in the engine speed are sufficient to overcome tension exerted by said spring means to permit further angular movement of said main masses and thus further angular movement of said plate connected to said cam.
Claim 4
Dependent Claim
252 words
A centrifugal advance device for an ignition distributor of an internal combustion engine of the type including a centrifugal governor having rotatable masses which are adapted to angularly displace a plate connected to a cam, said cam being adapted to actuate a contact-breaker arm for obtaining a variation in the timing of the moment of sparking dependent upon engine speed, comprising a rotatable shaft, a plate connected to said shaft, two main flywheel masses, each main mass being pivotable on a pin mounted on said plate connected to said shaft and being operatively connected to said plate so as to angularly displace said plate when said main masses are pivoted on said pins, two auxiliary flywheel masses operatively coupled to said two main flywheel masses, spring means operatively connected between said masses and said plate, and further including two abutments fixed to said plate adjacent the paths of movement of said auxiliary masses, said auxiliary masses abutting said abutments upon moving a first predetermined angular distance jointly with said main masses, said abutments preventing further angular movement of said auxiliary masses, further angular movement of said main masses being prevented by the force of said spring means for a predetermined period of engine speed increase until increasing centrifugal forces acting on said main masses due to increases in the engine speed are sufficient to overcome tension exerted by said spring means to permit further angular movement of said main masses and thus further angular movement of said plate connected to said cam.
Claim 5
Dependent Claim
81 words
A centrifugal advance device according to claim 1, wherein each auxiliary mass is pivoted on the same pin as a main mass to which it is coupled, each auxiliary mass and the associated main mass being coupled together by a further pin which connected to one of said masses and extending through an aperture formed in the other mass coupled therewith, one end of a spring forming part of said spring means being hooked to one end of said further pin.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |