Patent US4912875A successfully refreshed from Google Patents.
Patent US3683875A successfully refreshed from Google Patents.
US3683875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable valve timing for no control
Assignee: Old Carco LLC
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Filing: 1970-06-18
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Granted: 1972-08-15
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Expires: 1990-06-18
Abstract
Abstract A phase shift mechanism including a plate carrying a pair of oppositely disposed idler sprockets, the plate being pivotally mounted on the crankshaft of an internal combustion engine so that the idler sprockets engage the timing chain at opposite points of its internal periphery and may adjustably control the position of the chain relative to the camshaft and crankshaft by the pivotal movement of the plate on the crankshaft thus effecting phase shifting between the two shafts and changing valve timing relative to piston position.
Inventors
- 👤 Alexander Chadwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:07
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/34; F01L1/344; F01L1/348; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/1956
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
162 words
In an internal combustion engine, the combination with a camshaft, a crankshaft and a drive chain connecting the shafts, of a pair of idler sprockets for engaging the chain and a pivotally mounted support means carrying the idler sprockets and positioning them against the inside periphery of the chain at generally opposite points whereby the rotational relationship between the shafts may be varied by pivoting the support means and changing the relative tension exerted by the sprockets against the chain, the improvement wherein the support means comprises a single body pivotally mounted on the crankshaft and carrying both sprockets thereon, the support body including a geared portion, the combination further including a control gear for controlling the position of the support body, the control gear being rotatably carried by the engine to engage the geared portion on the support body whereby rotation of the control gear causes the support body to pivot on the crankshaft and change the position of idler sprockets.
Claim 2
Dependent Claim
162 words
In an internal combustion engine, the combination with a camshaft, a crankshaft and a drive chain connecting the shafts, of a pair of idler sprockets for engaging the chain and a pivotally mounted support means carrying the idler sprockets and positioning them against the inside periphery of the chain at generally opposite points whereby the rotational relationship between the shafts may be varied by pivoting the support means and changing the relative tension exerted by the sprockets against the chain, the improvement wherein the support means comprises a single body pivotally mounted on the crankshaft and carrying both sprockets thereon, the support body including a geared portion, the combination further including a control gear for controlling the position of the support body, the control gear being rotatably carried by the engine to engage the geared portion on the support body whereby rotation of the control gear causes the support body to pivot on the crankshaft and change the position of idler sprockets.
Claim 3
Dependent Claim
17 words
The combination according to claim 1 wherein the control gear is operably connected to the engine accelerator.
References Cited (Backward Citations)
US1819743A
Cited
FR760499A
Cited
US1599552A
Cited
US1925755A
Cited
US1871268A
Cited
US2279413A
Cited
GB549175A
Cited
US3441009A
Cited
US3496918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |