Patent US3728043A successfully refreshed from Google Patents.
US3728043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible blade fan with ribbed blades
Assignee: Siemens Bendix Automotive Electronics Ltd
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Filing: 1972-01-12
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Granted: 1973-04-17
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Expires: 1992-01-12
Abstract
Abstract A flexible bladed automotive cooling fan in which the blades are provided with a plurality of radially spaced, transversely extending, raised ribs on the side thereof opposite the arms to which the blades are connected, the ribs extending from the leading edges of the arms to a position intermediate the trailing edges of the arms and the blades.
Inventors
- 👤 S Pratinidhi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:24
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/382
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
141 words
In an automotive cooling fan comprising a hub, a plurality of arms radially extending from said hub, and radially extending resilient blades which decamber as rotational speed increases connected to said arms, said arms and blades also extending transversely between leading and trailing edges thereof defined by the direction of fan rotation, and said blades each connected adjacent its leading edge to arm and extending transversely to its trailing edge behind the trailing edge of said arm, that improvement in which each said blade is provided with a plurality of raised ribs radially spaced along said blade and extending transversely thereof from adjacent the leading edge of said arm to which said blade is connected to a position intermediate the trailing edges of said arm and said blade, said ribs raised on the side of said blade away from said arm.
Claim 2
Dependent Claim
141 words
In an automotive cooling fan comprising a hub, a plurality of arms radially extending from said hub, and radially extending resilient blades which decamber as rotational speed increases connected to said arms, said arms and blades also extending transversely between leading and trailing edges thereof defined by the direction of fan rotation, and said blades each connected adjacent its leading edge to arm and extending transversely to its trailing edge behind the trailing edge of said arm, that improvement in which each said blade is provided with a plurality of raised ribs radially spaced along said blade and extending transversely thereof from adjacent the leading edge of said arm to which said blade is connected to a position intermediate the trailing edges of said arm and said blade, said ribs raised on the side of said blade away from said arm.
Claim 3
Dependent Claim
29 words
The improvement claimed in claim 1 in which a rib is provided in said blade adjacent its said leading edge extending radially along the radial extent of said blade.
Claim 4
Dependent Claim
20 words
The improvement claimed in claim 2 in which said blade is connected to said arm on the downstream side thereof.
Claim 5
Dependent Claim
21 words
The improvement claimed in claim 1 in which said blade is connected to said arm by fasteners positioned between said ribs.
Claim 6
Dependent Claim
24 words
The improvement claimed in claim 4 in which said fasteners comprise rivets bearing directly on said blade on the side thereof opposite said arm.
Claim 7
Dependent Claim
30 words
The improvement claimed in claim 1 in which said blade includes a transversely extending inner edge adjacent said hub and one of said ribs is positioned on said inner edge.
Claim 8
Dependent Claim
29 words
The improvement claimed in claim 6 in which a rib is provided in said blade adjacent its said leading edge extending radially along the radial extent of said blade.
Claim 9
Dependent Claim
20 words
The improvement claimed in claim 7 in which said blade is connected to said arm on the downstream side thereof.
Claim 10
Dependent Claim
34 words
The improvement claimed in claim 8 in which said blade is connected to said arm by rivets bearing directly on said blade between said ribs on the side of said blade opposite said arm.
Claim 11
Dependent Claim
39 words
The improvement claimed in claim 1 in which said blade includes a transversely extending inner edge adjacent said hub and said ribs are Radially spaced along said blade between said inner edge and the outer end of said arm.
Claim 12
Dependent Claim
18 words
The improvement claimed in claim 10 in which one of said ribs in positioned on said inner edge.
Claim 13
Dependent Claim
29 words
The improvement claimed in claim 10 in which a rib is provided in said blade adjacent its said leading edge extending radially along the radial extent of said blade.
Claim 14
Dependent Claim
20 words
The improvement claimed in claim 12 in which said blade is connected to said arm on the downstream side thereof.
Claim 15
Dependent Claim
18 words
The improvement claimed in claim 13 in which one of said ribs is positioned on said inner edge.
Claim 16
Dependent Claim
34 words
The improvement claimed in claim 14 in which said blade is connected to said arm by rivets bearing directly on said blade between said ribs on the side of said blade opposite said arm.
References Cited (Backward Citations)
GB190912846A
Cited
DE559674C
Cited
FR939847A
Cited
CH326684A
Cited
US3406760A
Cited
US3490686A
Cited
US3639079A
Cited
US3698835A
Cited
US3679321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |