US3826332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air intake silencer for internal combustion engines
Assignee: Walbro Corp
•
Filing: 1972-12-27
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Granted: 1974-07-30
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Expires: 1992-12-27
Abstract
Abstract An air intake silencer for internal combustion engines to be attached directly to a carburetor intake having a large volume central chamber connected to the carburetor intake and surrounded by a peripheral tortuous passage feeding air from an outside inlet to the carburetor intake. The construction includes a gravity low point for the collection of fuel wherein it may be caught up into the incoming air stream and re-introduced into the engine. A relief valve is also provided to relieve the unit against back-fire pressures.
Inventors
- 👤 C Tuckey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:30
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/12; F02M35/1205; F02M35/1211
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
222 words
An air intake silencer for internal combustion engines to be attached to a carburetor air intake passage which comprises: a. a housing having relaTively flat, parallel, generally rectangular, end walls connected by a continuous sidewall, the dimension between the end walls being approximately one-half that of the dimensions of the rectangle, one of said end walls having an inlet opening for air near a first top edge thereof and one outlet opening spaced from said inlet positioned near an adjacent second edge to be fastened in communication with a carburetor inlet opening, b. a second side inner wall extending in substantially parallel relation to said first side wall along said first edge to a contiguous third edge opposite said second edge and then along a fourth edge to a point adjacent said outlet, the area dimension between said sidewalls being approximately that of the inlet opening to form a continuous, tortuous passage from said inlet to said outlet around a remaining central chamber within said walls, c. said sidewalls being shaped along said fourth edge to descend to an extreme position below said first edge and to rise from said position toward said outlet, and an opening formed in said inner sidewall in the vicinity of said extreme position to permit accumulated fuel in said central chamber to flow to said passage.
Claim 2
Dependent Claim
222 words
An air intake silencer for internal combustion engines to be attached to a carburetor air intake passage which comprises: a. a housing having relaTively flat, parallel, generally rectangular, end walls connected by a continuous sidewall, the dimension between the end walls being approximately one-half that of the dimensions of the rectangle, one of said end walls having an inlet opening for air near a first top edge thereof and one outlet opening spaced from said inlet positioned near an adjacent second edge to be fastened in communication with a carburetor inlet opening, b. a second side inner wall extending in substantially parallel relation to said first side wall along said first edge to a contiguous third edge opposite said second edge and then along a fourth edge to a point adjacent said outlet, the area dimension between said sidewalls being approximately that of the inlet opening to form a continuous, tortuous passage from said inlet to said outlet around a remaining central chamber within said walls, c. said sidewalls being shaped along said fourth edge to descend to an extreme position below said first edge and to rise from said position toward said outlet, and an opening formed in said inner sidewall in the vicinity of said extreme position to permit accumulated fuel in said central chamber to flow to said passage.
Claim 3
Dependent Claim
145 words
An air intake silencer for internal combustion engines to be attached to a carburetor air intake passage which comprises: a. an enclosed housing having an outlet opening in one side to be mounted adjacent a carburetor air inlet and an air inlet opening spaced from said outlet, b. means forming a confined passage in conjunction with the walls of said housing leading tortuously from said inlet to said outlet and a relatively large central chamber surrounding said outlet, c. said passage originating near the top of said housing as mounted and descending to a low point just upstream of said outlet, and d. means forming a fuel drain passage leading from said central chamber to said low point in said passage to permit accumulated fuel in said central chamber to drain into said passage and be picked up by inlet air flowing through said passage.
Claim 4
Dependent Claim
145 words
An air intake silencer for internal combustion engines to be attached to a carburetor air intake passage which comprises: a. an enclosed housing having an outlet opening in one side to be mounted adjacent a carburetor air inlet and an air inlet opening spaced from said outlet, b. means forming a confined passage in conjunction with the walls of said housing leading tortuously from said inlet to said outlet and a relatively large central chamber surrounding said outlet, c. said passage originating near the top of said housing as mounted and descending to a low point just upstream of said outlet, and d. means forming a fuel drain passage leading from said central chamber to said low point in said passage to permit accumulated fuel in said central chamber to drain into said passage and be picked up by inlet air flowing through said passage.
Claim 5
Dependent Claim
108 words
An air intake silencer for internal combustion engines to be attached to a carburetor air intake passage which comprises: a. an enclosed housing having an outlet opening in one side to be mounted adjacent a carburetor air inlet and an air inlet opening spaced from said outlet, b. means forming a confined passage in conjunction with the walls of said housing leading tortuously from said inlet to said outlet and a relatively large central chamber surrounding said outlet, and c. a unidirectional relief valve disposed in a wall of said housing in communication with said central chamber to relieve excessive pressure within said housing due to engine backfire.
Claim 6
Dependent Claim
108 words
An air intake silencer for internal combustion engines to be attached to a carburetor air intake passage which comprises: a. an enclosed housing having an outlet opening in one side to be mounted adjacent a carburetor air inlet and an air inlet opening spaced from said outlet, b. means forming a confined passage in conjunction with the walls of said housing leading tortuously from said inlet to said outlet and a relatively large central chamber surrounding said outlet, and c. a unidirectional relief valve disposed in a wall of said housing in communication with said central chamber to relieve excessive pressure within said housing due to engine backfire.
Claim 7
Dependent Claim
196 words
An air intake silencer for internal combustion engines to be attached to a carburetor air intake passage which comprises: a. a housing having relatively flat, parallel, generally rectangular, end walls connected by a continuous sidewall, the dimension between the end walls being approximately one-half that of the dimensions of the rectangle, one of said end walls having an inlet opening for air near a first top edge thereof and one outlet opening spaced from said inlet positioned near an adjacent second edge to be fastened in communication with a carburetor inlet opening, b. a second side inner wall extending in substantially parallel relation to said first side wall along said first edge to a contiguous third edge opposite said second edge and then along a fourth edge to a point adjacent said outlet, the area dimension between said sidewalls being approximately that of the inlet opening to form a continuous, tortuous passage from said inlet to said outlet around a remaining central chamber within said walls, and c. a unidirectional relief valve disposed in a wall of said housing in communication with said central chamber to relief excessive pressure within said housing due to engine backfire.
Claim 8
Dependent Claim
196 words
An air intake silencer for internal combustion engines to be attached to a carburetor air intake passage which comprises: a. a housing having relatively flat, parallel, generally rectangular, end walls connected by a continuous sidewall, the dimension between the end walls being approximately one-half that of the dimensions of the rectangle, one of said end walls having an inlet opening for air near a first top edge thereof and one outlet opening spaced from said inlet positioned near an adjacent second edge to be fastened in communication with a carburetor inlet opening, b. a second side inner wall extending in substantially parallel relation to said first side wall along said first edge to a contiguous third edge opposite said second edge and then along a fourth edge to a point adjacent said outlet, the area dimension between said sidewalls being approximately that of the inlet opening to form a continuous, tortuous passage from said inlet to said outlet around a remaining central chamber within said walls, and c. a unidirectional relief valve disposed in a wall of said housing in communication with said central chamber to relief excessive pressure within said housing due to engine backfire.
References Cited (Backward Citations)
US1899911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |