Patent US3698835A successfully refreshed from Google Patents.
US3698835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan construction
Assignee: Individual
•
Filing: 1971-02-01
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Granted: 1972-10-17
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Expires: 1991-02-01
Abstract
Abstract A fan construction suitable for cooling internal combustion engines has flexible blades clamped on the inside faces of the spider arms, each blade having a hinge section in the form of a tapered bead or corrugation extending along its length with the concave part of the bead facing the spider arm so that both longitudinal edges of the bead engage the arm over a substantial portion of the length of the blade.
Inventors
- 👤 John C Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:48
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/382
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
An axial flow flexible fan construction of the type used on variable speed engines comprising a rotatable spider having an axis Of rotation and arms extending radially with respect to said axis and fan blades secured along a line of attachment to said arms and inducing fluid flow in a direction parallel to said axis, said blades each comprising an attachment side portion overlapping said arm and a trailing edge side portion extending away from said arm and attachment portion, said attachment portion including a corrugated flexible hinge section spaced from said line of attachment extending the full length of the blade and forming the fixed side about which the blade deflects due to variations in fluid pressure on the blade, said attachment portions being secured to the downstream sides of the arms.
Claim 2
Dependent Claim
133 words
An axial flow flexible fan construction of the type used on variable speed engines comprising a rotatable spider having an axis Of rotation and arms extending radially with respect to said axis and fan blades secured along a line of attachment to said arms and inducing fluid flow in a direction parallel to said axis, said blades each comprising an attachment side portion overlapping said arm and a trailing edge side portion extending away from said arm and attachment portion, said attachment portion including a corrugated flexible hinge section spaced from said line of attachment extending the full length of the blade and forming the fixed side about which the blade deflects due to variations in fluid pressure on the blade, said attachment portions being secured to the downstream sides of the arms.
Claim 3
Dependent Claim
48 words
A fan construction as set forth in claim 1 wherein said hinge section engages the arm along at least two lines of tangency and said trailing edge section deflects about said lines as axes of deflection and also about a line located centrally between said lines of tangency.
Claim 4
Dependent Claim
18 words
A fan construction as set forth in claim 2 wherein said hinge section comprises a single arcuate bead.
Claim 5
Dependent Claim
26 words
A fan construction as set forth in claim 3 wherein said bead varies uniformly in size from the inner to the outer ends of the blade.
Claim 6
Dependent Claim
33 words
A fan construction as set forth in claim 4 wherein said bead is of constant width but tapered in depth so that its shallow end is at the inner end of the blade.
Claim 7
Dependent Claim
23 words
A fan construction as set forth in claim 5 including means substantially closing the inner end of the channel formed by the bead.
Claim 8
Dependent Claim
38 words
A fan construction as set forth in claim 1 wherein said hinge sections each comprises a plurality of parallel ribs tangent along a plurality of lines with the downstream side of the arm to which it is secured.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |