Patent US3733147A successfully refreshed from Google Patents.
US3733147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radial and axial airflow fan
Assignee: Individual
•
Filing: 1970-12-07
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Granted: 1973-05-15
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Expires: 1990-12-07
Abstract
Abstract The open forward unobstructed root portions of radially extending fan blades are secured to the arms of front and rear portions spaced apart axially. A large aperture in the central portion of the front spider enables air to flow axially into a chamber between the front and rear spiders which opens radially outwardly between the root portions of the blades. Trailing edge margins of the blades are connected to the rear spider by angles riveted to such blade portions and to the rear spider and leading edge margins of the blades are riveted to arms of the front spider.
Inventors
- 👤 S Felker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:22
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
A fan comprising a front plate, a rear plate spaced axially from said front plate, a plurality of radial fan blades bridging between said front plate and said rear plate, each of said blades being curved transversely to form an arc between its leading edge and its trailing edge substantially less than 180 degrees and to dispose the trailing portion of each blade at a substantial angle to said rear plate, means connecting the leading portion of each blade to said front plate, and means connecting said blade trailing portion to said rear plate, the central portions of said front plate and of said rear plate being spaced apart axially for providing a central chamber between said plates, said front plate having a central aperture therethrough enabling air to flow in an axial direction inwardly into said central chamber and said central chamber opening generally radially outwardly between the inner end portions of said blades for discharge of air therefrom.
Claim 2
Dependent Claim
160 words
A fan comprising a front plate, a rear plate spaced axially from said front plate, a plurality of radial fan blades bridging between said front plate and said rear plate, each of said blades being curved transversely to form an arc between its leading edge and its trailing edge substantially less than 180 degrees and to dispose the trailing portion of each blade at a substantial angle to said rear plate, means connecting the leading portion of each blade to said front plate, and means connecting said blade trailing portion to said rear plate, the central portions of said front plate and of said rear plate being spaced apart axially for providing a central chamber between said plates, said front plate having a central aperture therethrough enabling air to flow in an axial direction inwardly into said central chamber and said central chamber opening generally radially outwardly between the inner end portions of said blades for discharge of air therefrom.
Claim 3
Dependent Claim
61 words
The fan defined in claim 1, in which the front plate is a spider including a ring portion and circumferentially spaced arms radiating from said ring portion, having throats therebetween and connected, respectively, so the leading edge margins of the blades, the inner end portions of the blades projecting inward beyond said throats into overlapping relationship with said spider ring portion.
Claim 4
Dependent Claim
40 words
The fan defined in claim 1, and angle connectors each having a first flange connected to the rear plate and a second flange projecting generally axially of the fan from said first flange and connected to the blade trailing portion.
Claim 5
Dependent Claim
24 words
The fan defined in claim 3, in which the second flange of each angle connector projects rearwardly from the first flange of such connector.
Claim 6
Dependent Claim
24 words
The fan defined in claim 3, in which the second flange of each angle connector projects forwardly from the first flange of such connector.
Claim 7
Dependent Claim
83 words
The fan defined in claim 1, in which the front plate and the rear plate are spiders including corresponding circumferentially spaced arms projecting generally radially from the central portionS of said spiders, said arms of the front plate spider and corresponding arms of the rear plate spider being disposed generally in registry axially of the fan, and spacer means independent of the blades connecting the corresponding registering arms of said front plate spider and said rear plate spider, respectively, in definitely spaced relationship.
Claim 8
Dependent Claim
34 words
The fan defined in claim 3, in which the second flange of each angle connector extends along a major portion of the length of the blade trailing edge portion to which it is connected.
Claim 9
Dependent Claim
86 words
The fan defined in claim 6, and angle connectors each having a first flange connected to a rear plate spider arm and a second flange projecting generally axially of the fan from said first flange and connected to a blade trailing portion, the outer end portion of each angle connector projecting generally radially outwardly to a location a substantial distance beyond the outer end of the radiating arm of the front plate spider corresponding to the rear plate spider to which such angle connector is connected.
References Cited (Backward Citations)
US1011259A
Cited
US2032224A
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US2262695A
Cited
US2347838A
Cited
US2347839A
Cited
GB621326A
Cited
US3323711A
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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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |