Patent US3584969A successfully refreshed from Google Patents.
US3584969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible blade fan
Assignee: Aisin Corp
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Filing: 1969-05-22
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Granted: 1971-06-15
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Expires: 1989-05-22
Abstract
Abstract A cooling fan assembly for powered vehicle, preferably adapted for automotive use, and having a boss and a plurality of radial fan blades made integral therewith of synthetic and resilient resin material, said assembly being characterized by the provision of a recess formed at the downstream area on each of said fan blades and in proximity of the root of the blade, thereby reducing the quantity of the delivery air with higher rotational speeds of the fan for avoiding an overcooling of the powering engine of said vehicle.
Inventors
- 👤 Shigeo Aiki
- 👤 Uichiro Kobashi
- 👤 Masaharu Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:04
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/382
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A fan assembly having a circular boss and a plurality of radially extending integral blades, said boss and blades being of one piece construction and made of synthetic resin material having a predetermined elasticity, said assembly being characterized in that each of said blades is formed with the lead and trailing edges thereof disposed substantially along radial lines and is formed at the root thereof in the region of the tailing area when seen in the direction of rotational movement of the blade with a substantially triangular recess for increasing the tendency of elastic deformation of the aerofoil section radially outward of said recess for reducing the wind delivery at high rotational speeds of the fan, said aerofoil section radially outwardly of said recess having a decreasing thickness from the radial centerline of the blade to the trailing edge to facilitate the elastic deformation of this portion of the blade.
Claim 2
Dependent Claim
150 words
A fan assembly having a circular boss and a plurality of radially extending integral blades, said boss and blades being of one piece construction and made of synthetic resin material having a predetermined elasticity, said assembly being characterized in that each of said blades is formed with the lead and trailing edges thereof disposed substantially along radial lines and is formed at the root thereof in the region of the tailing area when seen in the direction of rotational movement of the blade with a substantially triangular recess for increasing the tendency of elastic deformation of the aerofoil section radially outward of said recess for reducing the wind delivery at high rotational speeds of the fan, said aerofoil section radially outwardly of said recess having a decreasing thickness from the radial centerline of the blade to the trailing edge to facilitate the elastic deformation of this portion of the blade.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |