US4387062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetor float chamber venting system
Assignee: Toyota Motor Corp
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Filing: 1982-01-21
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Granted: 1983-06-07
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Expires: 2002-01-21
Abstract
Abstract A carburetor float chamber venting system includes an intake system float chamber venting passage which leads from an upper part of the carburetor float chamber to the intake system, a fuel vapor absorption device float chamber venting passage which leads from an intermediate part of the intake system float chamber venting passage to a fuel vapor absorption device, and a control valve, provided at a part of the fuel vapor absorption device float chamber venting passage, whose operation controls the opening and closing of the fuel vapor absorption device float chamber venting passage.
Inventors
- 👤 Yoshiyuki Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:54
CPC Classifications
F; F02; F02M; F02M5/00; F02M5/08; F02M25/00; F02M25/08; F02M25/0836; F02M2025/0845; Y; Y10; Y10S; Y10S261/00; Y10S261/67; Y10S261/74
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
204 words
A carburetor float chamber venting system, for a double barreled carburetor having a primary throat, a secondary throat and a float chamber and adapted to supply fuel-air mixture to an internal combustion engine having an intake system, a fuel vapor absorption device, and an ignition switch, comprising: a primary intake system float chamber venting passage which leads from an upper part of said float chamber to said primary throat; a secondary intake system float chamber venting passage which leads from a first intermediate part of said primary intake system float chamber venting passage to said secondary throat; a fuel vapor absorption device float chamber venting passage which leads from a second intermediate part of said primary intake system float chamber venting passage located on the remote side of said first intermediate part thereof as viewed from said upper part of said float chamber to said fuel vapor absorption device; and a control valve, provided at a part of said fuel vapor absorption device float chamber venting passage, whose operation controls the communication and interception between said second intermediate part of said primary intake system float chamber venting passage and said fuel vapor absorption device via said fuel vapor absorption device float chamber venting passage.
Claim 2
Dependent Claim
204 words
A carburetor float chamber venting system, for a double barreled carburetor having a primary throat, a secondary throat and a float chamber and adapted to supply fuel-air mixture to an internal combustion engine having an intake system, a fuel vapor absorption device, and an ignition switch, comprising: a primary intake system float chamber venting passage which leads from an upper part of said float chamber to said primary throat; a secondary intake system float chamber venting passage which leads from a first intermediate part of said primary intake system float chamber venting passage to said secondary throat; a fuel vapor absorption device float chamber venting passage which leads from a second intermediate part of said primary intake system float chamber venting passage located on the remote side of said first intermediate part thereof as viewed from said upper part of said float chamber to said fuel vapor absorption device; and a control valve, provided at a part of said fuel vapor absorption device float chamber venting passage, whose operation controls the communication and interception between said second intermediate part of said primary intake system float chamber venting passage and said fuel vapor absorption device via said fuel vapor absorption device float chamber venting passage.
Claim 3
Dependent Claim
90 words
A carburetor float chamber venting system according to claim 1, wherein said control valve is adapted to isolate a part of said primary intake system float chamber venting passage located on the remote side of said second intermediate part thereof as viewed from said upper part of said float chamber from said second intermediate part thereof when said control valve communicates said fuel vapor absorption device to said second intermediate part of said primary intake system float chamber venting passage via said fuel vapor absorption device float chamber venting passage.
Claim 4
Dependent Claim
82 words
A carburetor float chamber venting system according to claim 1, wherein said control valve includes an electromagnetic acutator adapted to be actuated when the ignition switch of the engine is closed and a fluid pressure actuator adapted to be actuated by intake vacuum of the engine, and is operated so as to isolate said fuel vapor absorption device from said second intermediate part of said primary intake system float chamber venting passage when at least one of said two actuators is actuated.
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) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |