Patent US4040295A successfully refreshed from Google Patents.
US4040295A
Expired / Lapsed
US
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Air intake flowmeter for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1976-10-13
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Granted: 1977-08-09
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Expires: 1996-10-13
Abstract
Abstract A volumetric air flowmeter for internal combustion engines, which includes a cast metal housing, a rectangular airflow channel therewithin, and a transversely-extending, trapezoidal-shaped pivotal baffle plate mounted on a pivot shaft. There is also provided on the pivot shaft a damping flap, angularly offset with respect to the baffle plate, which revolves, in unison with baffle plate deflection, about the shaft axis into a damping chamber. Circumferential clearances are provided between the baffle plate and its channel and between the damping flap and its chamber.
Inventors
- 👤 Peter Romann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:15
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/28; F; F02; F02M; F02M69/00; F02M69/46; F02M69/48
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
65 words
In a flowmeter for measuring the air intake flow in an internal combustion engine, including a cast housing, a rectangular flow channel provided therein and a transversely extending baffle plate mounted on a pivotal shaft, the improvement comprising that the baffle plate is substantially trapezoidal-shaped having longer and shorter oppositely disposed parallel edge portions, the longer of said edge portions lying adjacent said pivotal shaft.
Claim 2
Dependent Claim
65 words
In a flowmeter for measuring the air intake flow in an internal combustion engine, including a cast housing, a rectangular flow channel provided therein and a transversely extending baffle plate mounted on a pivotal shaft, the improvement comprising that the baffle plate is substantially trapezoidal-shaped having longer and shorter oppositely disposed parallel edge portions, the longer of said edge portions lying adjacent said pivotal shaft.
Claim 3
Dependent Claim
59 words
A flowmeter according to claim 1, wherein a trapezoidal-shaped damping flap is provided on the pivotal shaft in spaced angular relation to said baffle plate and mounted to move within a rectangular walled, semi-circular damping chamber, the damping flap further having longer and shorter oppositely-disposed parallel edge portions, the longer of said edge portions lying adjacent said pivotal shaft.
References Cited (Backward Citations)
US3782339A
Cited
US3983848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |