US3850545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flex fan
Assignee: Hayes-Albion Corp
•
Filing: 1972-09-07
•
Granted: 1974-11-26
•
Expires: 1992-09-07
Abstract
Abstract Flexible fan blades which decamber with increasing speed of the fan are mounted to a casting. The hub and spider arms are defined by the casting. The spider arms are thick and aerodynamically shaped to reduce the tendency of the fan to stall. The arms support the blade along its entire length to prevent lateral vibrations.
Inventors
- 👤 T Weir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:21
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/382
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
152 words
An automotive fan comprising: a one-piece cast member including a hub and a plurality of spider arms projecting radially from said hub; said spider arms being skewed to the plane of said hub and having a rounded thickened leading edge and curved front and rear faces merging into said leading edge such that said spider arms are aerodynamically shaped to decrease the sensitivity of said fan to stalling and including a L-shaped recess in one face of each of said arms for receiving flexible fan blades; a curved one-piece flexible fan blade, having a free end, attached to each of said spider arms in said recess such that the leading edges of said fan are defined entirely by said spider arms, the outer face of said blade is substantially aligned with the recessed face of said spider arm and said blades abut said spider arms along the entire length of said blades.
Claim 2
Dependent Claim
152 words
An automotive fan comprising: a one-piece cast member including a hub and a plurality of spider arms projecting radially from said hub; said spider arms being skewed to the plane of said hub and having a rounded thickened leading edge and curved front and rear faces merging into said leading edge such that said spider arms are aerodynamically shaped to decrease the sensitivity of said fan to stalling and including a L-shaped recess in one face of each of said arms for receiving flexible fan blades; a curved one-piece flexible fan blade, having a free end, attached to each of said spider arms in said recess such that the leading edges of said fan are defined entirely by said spider arms, the outer face of said blade is substantially aligned with the recessed face of said spider arm and said blades abut said spider arms along the entire length of said blades.
Claim 3
Dependent Claim
20 words
The automotive fan set forth in claim 1 wherein said hub and arm member are formed from an aluminum alloy.
References Cited (Backward Citations)
DE138077C
Cited
FR411904A
Cited
US1250681A
Cited
US1347003A
Cited
US2032224A
Cited
US2323165A
Cited
US2406499A
Cited
US2774308A
Cited
DE961742C
Cited
GB856668A
Cited
US3042371A
Cited
US3044557A
Cited
US3664165A
Cited
US3773435A
Cited
US3711219A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |