Patent US3924588A successfully refreshed from Google Patents.
US3924588A
Expired / Lapsed
US
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Positive crankcase ventilation system
Assignee: Individual
•
Filing: 1974-01-18
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Granted: 1975-12-09
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Expires: 1994-01-18
Abstract
Abstract The engine crankcase is connected to the intake manifold of carburetor engines through a poppet valve with spring adjusted so that the valve is closed while starting, partly open while idling, closed during acceleration and wide open during deceleration whereby to maintain relatively uniform optimum vacuum in the manifold. The crankcase is also connected with the intake air cleaner. Both sides of V-type engines are connected to the valve inlet.
Inventors
- 👤 Lowell T Hager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:49
CPC Classifications
F; F02; F02M; F02M25/00; F02M25/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7748; Y10T137/7749
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A positive crankcase ventilating system for an engine having a carburetor and an intake manifold and a crankcase including gas flow connections between crankcase and intake manifold and between crankcase and carburetor air intake, in combination, a flow control valve interposed in the crankcase-intake manifold connection, said flow control valve being a spring poppet valve oriented to permit flow from the crankcase into the intake manifold, the extent of opening of said valve from the extreme positions of closed to full open being progressively responsive to the degree of vacuum in the intake manifold, the force applied by the spring of said poppet valve tending to close the valve against the pull of the vacuum in the intake manifold being such that the valve is only partly open when the engine is idling, is closed during substantial acceleration, and is full open during substantial deceleration.
Claim 2
Dependent Claim
145 words
A positive crankcase ventilating system for an engine having a carburetor and an intake manifold and a crankcase including gas flow connections between crankcase and intake manifold and between crankcase and carburetor air intake, in combination, a flow control valve interposed in the crankcase-intake manifold connection, said flow control valve being a spring poppet valve oriented to permit flow from the crankcase into the intake manifold, the extent of opening of said valve from the extreme positions of closed to full open being progressively responsive to the degree of vacuum in the intake manifold, the force applied by the spring of said poppet valve tending to close the valve against the pull of the vacuum in the intake manifold being such that the valve is only partly open when the engine is idling, is closed during substantial acceleration, and is full open during substantial deceleration.
Claim 3
Dependent Claim
21 words
Structure in accordance with claim 1 and including means accessible externally of the valve for adjusting the force of the spring.
Claim 4
Dependent Claim
64 words
Structure in accordance with claim 2 wherein the adjusting means comprises a portion of the poppet valve stem which extends above the valve body, the end portion of said valve stem being threaded, a compression spring upon said extended portion of said valve stem, and a nut screwed upon said end portion of said valve stem to maintain said spring under adjustable compressive stress.
Claim 5
Dependent Claim
16 words
Structure in accordance with claim 1 wherein the valve is mounted directly upon the intake manifold.
Claim 6
Dependent Claim
38 words
Structure in accordance with claim 1 wherein the system is for a V-type engine and the connection between the crankcase and the intake manifold comprises connection of the intake of the valve with both sides of the engine.
References Cited (Backward Citations)
US1785726A
Cited
US1812860A
Cited
US3000394A
Cited
US3111138A
Cited
US3272192A
Cited
US3359960A
Cited
US3237617A
Cited
US3491732A
Cited
US3494339A
Cited
US3709204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |