Patent US3639079A successfully refreshed from Google Patents.
US3639079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible-bladed fan with improved reinforcing cap
Assignee: Siemens Bendix Automotive Electronics Ltd
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Filing: 1970-03-12
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Granted: 1972-02-01
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Expires: 1990-03-12
Abstract
Abstract A fan having a hub, a plurality of arms extending radially outwardly of the hub, blade structures, one secured to each arm, each comprising resilient trailing portions which decamber as rotational speed increases, and a reinforcing cap secured to each arm and blade which has a decamber-limiting portion extending partially coextensively with the trailing blade portion at an acute angle thereto, and two integrally formed upstanding lips, one disposed along each opposed radially spaced edge of the cap and of the decamber-limiting portion thereof which reduce metal fatigue in the cap.
Inventors
- 👤 Shrinivas V Pratinidhi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:25
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/382
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
In a fan having a hub, a plurality of arms extending radially outwardly of said hub, and blade structures comprising resilient trailing portions which decamber as rotational speed increases, one blade structure being secured to each said arm, reinforcing caps, one said cap secured to each blade structure and the respective said arm, and each said cap comprising (a) a trailing decamber-limiting portion extending partially coextensively with the trailing portion of said blade structure at an acute angle to said trailing portion of said blade structure, and (b) two radially spaced integrally formed upstanding lips, one disposed along each opposed radially spaced side edge of said cap and of said decamber-limiting portion thereof, whereby periodic stresses induced in said cap during decambering of said trailing portion of said blade structure against said cap are resisted without excessive metal fatigue in said cap.
Claim 2
Dependent Claim
142 words
In a fan having a hub, a plurality of arms extending radially outwardly of said hub, and blade structures comprising resilient trailing portions which decamber as rotational speed increases, one blade structure being secured to each said arm, reinforcing caps, one said cap secured to each blade structure and the respective said arm, and each said cap comprising (a) a trailing decamber-limiting portion extending partially coextensively with the trailing portion of said blade structure at an acute angle to said trailing portion of said blade structure, and (b) two radially spaced integrally formed upstanding lips, one disposed along each opposed radially spaced side edge of said cap and of said decamber-limiting portion thereof, whereby periodic stresses induced in said cap during decambering of said trailing portion of said blade structure against said cap are resisted without excessive metal fatigue in said cap.
Claim 3
Dependent Claim
22 words
The fan of claim 1 wherein each said lip extends no more than one-eighth inch above the remaining surface of said cap.
Claim 4
Dependent Claim
37 words
The fan of claim 1 wherein said cap is also sized to be partially coextensive with said blade structure past the end of said arm, and is secured to said blade at a point past said arm.
Claim 5
Dependent Claim
34 words
The fan of claim 3 including a plurality of fasteners extending through said cap, said blade structure, and said arm and at least one fastener extending only through said cap and said blade structure.
Claim 6
Dependent Claim
22 words
The fan of claim 4 wherein each said lip extends no more than about one-eighth inch above the surface of said cap.
Claim 7
Dependent Claim
14 words
The fan of claim 5 wherein said lips are substantially parallel to one another.
References Cited (Backward Citations)
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US3289924A
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US3356154A
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US3490686A
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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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |