US3635285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling fan
Assignee: Motors Liquidation Co
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Filing: 1970-05-11
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Granted: 1972-01-18
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Expires: 1990-05-11
Abstract
Abstract A fan-cooling system wherein the fan and shroud arrangement is such that the rearwardly extending cylindrical portion of the shroud encompasses only substantially the forward half of a fan assembly, there being a radially outwardly extending continuation formed adjacent the trailing edge of each of the fan blades and extending radially outwardly of the inner surface of the shroud, thereby effectively enlarging the fan in a given engine compartment. This causes the tip of each blade to include a generally radially outwardly extending contoured central segment intermediate two generally transversely extending forward and rear segments, both tapering slightly inwardly from their respective points of juncture with the intermediate central segment, resulting in the formation of a generally conically shaped clearance between the rear edge of the shroud and the generally radially extending central segment of the fan blades. Recirculation of air through the clearance is thus diminished, as a result of the edge of the shroud serving to directly block the air from flowing into the vacuum area created between the radiator and the fan, and the now larger diameter fan producing a radially extending circumferential ''''wall'''' of air adjacent the shroud edge because of the increased action of centrifugal force.
Inventors
- 👤 Dennis A Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:45
CPC Classifications
F; F01; F01P; F01P5/00; F01P5/02; F01P5/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
A fan-cooling system for use in flowing air from a radiator to an engine, said system comprising a shroud secured at the forward end thereof to said radiator and having a rearwardly extending cylindrical portion, a fan assembly mounted for rotation on aid engine and including a plurality of fan blades, the leading edge of each of said blades being surrounded by said cylindrical shroud portion and sloping away therefrom toward said radiator, the trailing edge thereof being exterior of said cylindrical shroud portion, a generally radially outward extension formed on each of said blades adjacent said trailing edge so as to extend substantially radially outward of the inner surface of said cylindrical shroud portion and rearward of said shroud edge and forming a substantially narrow clearance with said shroud edge, with said narrow clearance serving to prevent the reverse flow of air back into the vacuum area between said leading edge and said radiator.
Claim 2
Dependent Claim
155 words
A fan-cooling system for use in flowing air from a radiator to an engine, said system comprising a shroud secured at the forward end thereof to said radiator and having a rearwardly extending cylindrical portion, a fan assembly mounted for rotation on aid engine and including a plurality of fan blades, the leading edge of each of said blades being surrounded by said cylindrical shroud portion and sloping away therefrom toward said radiator, the trailing edge thereof being exterior of said cylindrical shroud portion, a generally radially outward extension formed on each of said blades adjacent said trailing edge so as to extend substantially radially outward of the inner surface of said cylindrical shroud portion and rearward of said shroud edge and forming a substantially narrow clearance with said shroud edge, with said narrow clearance serving to prevent the reverse flow of air back into the vacuum area between said leading edge and said radiator.
Claim 3
Dependent Claim
244 words
A fan-cooling system for use in flowing air from a radiator to an engine, said system comprising a shroud secured at the forward end thereof to said radiator and having a cylindrical portion extending axially toward said engine, a fan assembly mounted for rotation on said engine and including a plurality of fan blades each having a leading edge adjacent said radiator and a trailing edge adjacent said engine, the rearmost edge of said cylindrical portion forming a plane through said fan blades intermediate the leading and trailing edges thereof, a generally radially outwardly extending trailing portion of each of said blades rearward of said plane and formed adjacent said trailing edge so as to extend substantially radially outward of the inner surface of said cylindrical shroud portion and rearward of said shroud edge and forming a substantially narrow, generally conically shaped clearance with said shroud edge, the leading portion of each of said blades forward of said plane being spaced-apart from said inner surface of said cylindrical shroud portion a substantially greater distance than that of said generally conically shaped clearance such that air flow rearwardly therethrough is unimpeded and said conically shaped clearance serves as the only seal area for preventing the tendency of said air to recirculaTe therethrough toward said radiator, with said seal area being immediately adjacent the radially extending circumferential wall of air resulting from the action of centrifugal force outward of said generally radially outwardly extending trailing portion.
Claim 4
Dependent Claim
244 words
A fan-cooling system for use in flowing air from a radiator to an engine, said system comprising a shroud secured at the forward end thereof to said radiator and having a cylindrical portion extending axially toward said engine, a fan assembly mounted for rotation on said engine and including a plurality of fan blades each having a leading edge adjacent said radiator and a trailing edge adjacent said engine, the rearmost edge of said cylindrical portion forming a plane through said fan blades intermediate the leading and trailing edges thereof, a generally radially outwardly extending trailing portion of each of said blades rearward of said plane and formed adjacent said trailing edge so as to extend substantially radially outward of the inner surface of said cylindrical shroud portion and rearward of said shroud edge and forming a substantially narrow, generally conically shaped clearance with said shroud edge, the leading portion of each of said blades forward of said plane being spaced-apart from said inner surface of said cylindrical shroud portion a substantially greater distance than that of said generally conically shaped clearance such that air flow rearwardly therethrough is unimpeded and said conically shaped clearance serves as the only seal area for preventing the tendency of said air to recirculaTe therethrough toward said radiator, with said seal area being immediately adjacent the radially extending circumferential wall of air resulting from the action of centrifugal force outward of said generally radially outwardly extending trailing portion.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |