Patent US3751181A successfully refreshed from Google Patents.
US3751181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan for cooling automotive vehicle engine
Assignee: Aisin Corp
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Filing: 1971-01-28
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Granted: 1973-08-07
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Expires: 1991-01-28
Abstract
Abstract A fan adapted for cooling the automotive vehicle engines and formed of molded plastic material, comprising hub portion and blades securely attached thereto, said blades being formed of thermoplastic material whereas said hub portion being formed of relatively stiff fiber reinforced thermoset plastic material, arms extending from the hub portion into the corresponding blades to form insert members, said thermoplastic material of which the blades are formed extending from the hub portion to cover the arms extending from the hub portion, and holes formed in the arms and the hub portion to provide a firm bond for the thermoplastic material.
Inventors
- 👤 M Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:54
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/382; F04D29/02; F04D29/023; F05; F05D; F05D2300/00; F05D2300/40; F05D2300/43; F05D2300/60; F05D2300/603
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
182 words
A multiblade flexible fan for cooling automotive vehicle engines comprising a fan member having a boss and a plurality of integral blades extending radially therefrom, said fan member being formed of molded thermoplastic material, and a hub member having integral insert members extending radially therefrom, and embedded in said blades adjacent the leading edges of said blades, said hub member and insert members being formed of reinforced plastic material, said hub member being provided with a peripheral rim extending parallel to the axis of rotation of the fan, said rim having a plurality of holes therethrough for receiving the thermoplastic material of the boss of the fan member when molded thereon to securely bond the fan member thereto, and said insert members being provided with holes therethrough for receiving the thermoplastic material of the blades when molded thereon to securely bond each blade to its associated insert member, whereby the trailing portions of the blades may flex to reduce the pitch thereof and thus reduce the quantity of air delivered by the fan in accordance with the rotational speed of the fan.
Claim 2
Dependent Claim
182 words
A multiblade flexible fan for cooling automotive vehicle engines comprising a fan member having a boss and a plurality of integral blades extending radially therefrom, said fan member being formed of molded thermoplastic material, and a hub member having integral insert members extending radially therefrom, and embedded in said blades adjacent the leading edges of said blades, said hub member and insert members being formed of reinforced plastic material, said hub member being provided with a peripheral rim extending parallel to the axis of rotation of the fan, said rim having a plurality of holes therethrough for receiving the thermoplastic material of the boss of the fan member when molded thereon to securely bond the fan member thereto, and said insert members being provided with holes therethrough for receiving the thermoplastic material of the blades when molded thereon to securely bond each blade to its associated insert member, whereby the trailing portions of the blades may flex to reduce the pitch thereof and thus reduce the quantity of air delivered by the fan in accordance with the rotational speed of the fan.
Claim 3
Dependent Claim
31 words
A multiblade flexible fan as claimed in claim 1 wherein the base portion of each blade is reduced in cross section to improve flexibility of the trailing portions of said blades.
Claim 4
Dependent Claim
17 words
A multiblade flexible fan as claimed in claim 1 wherein said reinforced plastic material is fiber reinforced.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |