Patent US4598246A successfully refreshed from Google Patents.
Patent US3613652A successfully refreshed from Google Patents.
US3613652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for automatically adjusting the timing of ignition of an internal combustion engine to correspond with the engine speed
Assignee: Equipements Automobiles Marchal SA
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Filing: 1970-02-16
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Granted: 1971-10-19
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Expires: 1990-02-16
Abstract
No abstract record available.
Inventors
- 👤 Jean Henri Stellwagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:21
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
352 words
An ignition device for an internal combustion engine which automatically adjusts itself by centrifugal force to set the timing of ignition of the gases to correspond with the speed of the engine comprising a control shaft being driven in rotation synchronously with the said engine and rigidly attached to a support plate; a movable plate rigidly attached to a cam centered on but not attached to said shaft; a breaker assembly centered around and cooperating with said cam to cause opening and closing of contacts which in turn cause ignition in the combustion chambers of said engine; two shafts rigidly attached to said support plate and positioned parallel to said control shaft, each of said shafts having rotatably attached thereto an arcuate primary inertial block which cooperates with two rollers each of which is mounted on a separate roller shaft parallel to said control shaft and attached to one end of one of a pair of secondary inertial blocks rotatably attached at its other end to a shaft mounted on said movable plate in a position parallel to said control shaft; each of said primary inertial blocks being in contact with both of said rollers, each roller being in rolling contact with the inside concave surface of one of said primary blocks and also in nonrolling contact with a notch at the end at the other of said primary blocks; said primary and secondary blocks being disposed symmetrically about said control shaft such that a plane containing said control shaft and the centers of gravity of said blocks can be rotated around said control shaft as an axis and in the direction of rotation of said control shaft to a position where that plane contains the pair of said shafts about which the corresponding pair of said inertial blocks rotate, said roller shaft being limited in movement around said control shaft by an oblong recess in said movable plate and being restrained from movement within said recess by at least two springs one of which is joined to said support plate and the other of which is joined to said movable plate.
Claim 2
Dependent Claim
352 words
An ignition device for an internal combustion engine which automatically adjusts itself by centrifugal force to set the timing of ignition of the gases to correspond with the speed of the engine comprising a control shaft being driven in rotation synchronously with the said engine and rigidly attached to a support plate; a movable plate rigidly attached to a cam centered on but not attached to said shaft; a breaker assembly centered around and cooperating with said cam to cause opening and closing of contacts which in turn cause ignition in the combustion chambers of said engine; two shafts rigidly attached to said support plate and positioned parallel to said control shaft, each of said shafts having rotatably attached thereto an arcuate primary inertial block which cooperates with two rollers each of which is mounted on a separate roller shaft parallel to said control shaft and attached to one end of one of a pair of secondary inertial blocks rotatably attached at its other end to a shaft mounted on said movable plate in a position parallel to said control shaft; each of said primary inertial blocks being in contact with both of said rollers, each roller being in rolling contact with the inside concave surface of one of said primary blocks and also in nonrolling contact with a notch at the end at the other of said primary blocks; said primary and secondary blocks being disposed symmetrically about said control shaft such that a plane containing said control shaft and the centers of gravity of said blocks can be rotated around said control shaft as an axis and in the direction of rotation of said control shaft to a position where that plane contains the pair of said shafts about which the corresponding pair of said inertial blocks rotate, said roller shaft being limited in movement around said control shaft by an oblong recess in said movable plate and being restrained from movement within said recess by at least two springs one of which is joined to said support plate and the other of which is joined to said movable plate.
Claim 3
Dependent Claim
31 words
The device of claim 1, wherein said secondary blocks are symmetrical with respect to said control shaft of the device and disposed so as to enclose said primary blocks between them.
Claim 4
Dependent Claim
45 words
The device of claim 1, wherein said oblong recesses in said movable plate are circular sectors which are symmetrical with respect to said control shaft and centered thereon, the angular opening of the said sectors being substantially equal to the maximum ignition delay measured angularly.
Claim 5
Dependent Claim
53 words
The device of claim 1, wherein each of said roller shafts is restrained in movement by two springs attached to said support plate, one of said springs providing movement restraint at any position of said shaft while the other of said springs provides such restraint only after an initial movement of said shaft.
Claim 6
Dependent Claim
34 words
The device of claim 1 wherein said springs attached to said roller shafts are sufficiently strong to restrain movement of said secondary blocks until the speed of said control shaft reaches a predetermined value.
Claim 7
Dependent Claim
57 words
The device of claim 1, wherein each of said secondary blocks supports a magnet which is sufficiently strong to prevent said primary blocks from moving separately from said secondary blocks until the centrifugal force exerted on the said secondary blocks by the rotational speed of said control shaft is sufficient to overcome the attraction of the magnet.
Claim 8
Dependent Claim
25 words
The device of claim 1, wherein said support plate contains means to limit the movement of said movable plate with respect to said support plate.
Claim 9
Dependent Claim
40 words
The device of claim 1, wherein said secondary blocks contain adjustable screw stops which provide a means for adjusting the relative positions of said secondary blocks with respect to said primary blocks when they were in contact with each other.
Claim 10
Dependent Claim
55 words
The device of claim 1, wherein each of said secondary blocks contains a magnet which cooperates with an element attached to said movable plate to provide an adjustable gap therebetween, said gap being adjusted to the necessary size to restrain movement of said secondary blocks until a predetermined speed of said control shaft is reached.
References Cited (Backward Citations)
US3220395A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |