US4018203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decompressing device
Assignee: BERNARD-MOTEURS
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Filing: 1976-01-09
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Granted: 1977-04-19
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Expires: 1996-01-09
Abstract
Abstract A decompressing device for facilitating starting of internal combustion engines, by lifting one of the engine valves at the beginning of the compression cycle, comprises a lever which is movable, by hydraulic pressure developed by an engine-driven oil pump, from an extended position in which one end of the lever effects said valve lifting to a retracted position. Lifting of the valve therefore stops when the engine speed (and hence the hydraulic pressure) reaches a predetermined level. The lever is moved between the extended and retracted positions by piston means located in a bore in the engine camshaft, the piston means being acted upon in one direction by the hydraulic pressure, and in the opposite direction by resilient means which tends to move the lever to the extended position.
Inventors
- 👤 Andre Legros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:12
CPC Classifications
F; F01; F01L; F01L13/00; F01L13/08; F01L13/085; F02; F02N; F02N19/00; F02N19/004
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
A decompression device for facilitating starting of an internal combustion engine, comprising piston means movable in an axial direction in a bore in an engine camshaft and urged in an axial direction by hydraulic pressure from an engine-driven oil pump against the action of resilient means; and a lever having a first end forming a retractable protrusion able to move radially of the camshaft in an aperture in the camshaft so that in an extended position the protrusion causes opening of an engine valve and in a retracted position does not cause opening of the valve, the other end of the lever being movable by said piston means sliding in the camshaft so that the first end moves from the extended position towards the retracted position as the hydraulic pressure increases.
Claim 2
Dependent Claim
131 words
A decompression device for facilitating starting of an internal combustion engine, comprising piston means movable in an axial direction in a bore in an engine camshaft and urged in an axial direction by hydraulic pressure from an engine-driven oil pump against the action of resilient means; and a lever having a first end forming a retractable protrusion able to move radially of the camshaft in an aperture in the camshaft so that in an extended position the protrusion causes opening of an engine valve and in a retracted position does not cause opening of the valve, the other end of the lever being movable by said piston means sliding in the camshaft so that the first end moves from the extended position towards the retracted position as the hydraulic pressure increases.
Claim 3
Dependent Claim
43 words
A device according to claim 1, in which the piston means comprises first and second pistons located end-to-end in the camshaft bore, the first piston being acted upon by the hydraulic pressure, and the second piston being acted upon by the resilient means.
Claim 4
Dependent Claim
23 words
A device according to claim 2, in which said other end of the lever is housed in a recess in the first piston.
Claim 5
Dependent Claim
28 words
A device according to claim 3, in which the end of the lever housed in the recess is held therein by the adjacent end of the second piston.
Claim 6
Dependent Claim
25 words
A device according to claim 4, in which the recess is bordered in the radial direction by the surface of the bore in the camshaft.
Claim 7
Dependent Claim
41 words
A device according to claim 2, including a pin extending through the camshaft and through a slot in the first piston to limit the travel of the first piston and to prevent the first piston from rotating relative to the camshaft.
Claim 8
Dependent Claim
36 words
A device according to claim 6, in which the slot in the first piston is so positioned that the lever is at right angles to the camshaft axis when the protrusion is in the extended position.
Claim 9
Dependent Claim
40 words
A device according to claim 1, including an oil pressure release slot in the piston means, which slot communicates with an oil outlet in the event of excessive travel of the piston means as a result of excess oil pressure.
Claim 10
Dependent Claim
18 words
A device according to claim 8, in which said aperture in the camshaft acts as the oil outlet.
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) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |