US4053259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial fan adjustable pitch connectable blades
Assignee: Axial International AG
•
Filing: 1975-10-28
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Granted: 1977-10-11
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Expires: 1995-10-28
Abstract
Abstract The hub of an axial-flow fan is constituted by two shell members axially juxtaposed for driven rotation about a common first axis. Circumferentially distributed ribs project from each shell member toward ribs on the other shell member, each pair of ribs being formed with cylindrically arcuate, respective seating faces about a common second axis transverse to the first axis, the seating faces jointly receiving a conforming root portion of a blade whose wing portion projects radially beyond the hub. The shell members and root portions are releasably clamped to each other by a clamping bolt axially passing through aligned openings in the shell members, the ribs, and the root portions, one clamping bolt constituting the sole element securing each blade to the hub so that individual blades may be released by removing one bolt only.
Inventors
- 👤 Emilio Bianchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:46
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34; F04D29/36
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A fan comprising: a. a first shell member having a first axis; b. drive means for rotating said shell member about said axis; c. a second shell member axially juxtaposed to said first shell member; d. a plurality of circumferentially distributed ribs projecting from each shell member toward respective, opposite ribs on the other shell member, 1. each rib having a seating face of circularly arcuate cross section about a second axis transverse to said first axis; e. a plurality of elongated blade members having each a root portion and a wing portion, 1. said root portion being of circularly arcuate cross section and interposed between two associated, opposite ribs, 2.
Claim 2
Dependent Claim
111 words
A fan comprising: a. a first shell member having a first axis; b. drive means for rotating said shell member about said axis; c. a second shell member axially juxtaposed to said first shell member; d. a plurality of circumferentially distributed ribs projecting from each shell member toward respective, opposite ribs on the other shell member, 1. each rib having a seating face of circularly arcuate cross section about a second axis transverse to said first axis; e. a plurality of elongated blade members having each a root portion and a wing portion, 1. said root portion being of circularly arcuate cross section and interposed between two associated, opposite ribs, 2.
Claim 3
Dependent Claim
85 words
said wing portion projecting radially outward relative to said first axis beyond said shell members; and f. releasable clamping means axially clamping said shell members and said root portions to each other in a position in which each root portion is fixedly secured in conforming engagement between the seating faces of the associated ribs, 1. said clamping means including a plurality of clamping members, each clamping member axially passing through aligned respective openings in said shell members, two opposite ribs, and the associated root portion.
Claim 4
Dependent Claim
85 words
said wing portion projecting radially outward relative to said first axis beyond said shell members; and f. releasable clamping means axially clamping said shell members and said root portions to each other in a position in which each root portion is fixedly secured in conforming engagement between the seating faces of the associated ribs, 1. said clamping means including a plurality of clamping members, each clamping member axially passing through aligned respective openings in said shell members, two opposite ribs, and the associated root portion.
Claim 5
Dependent Claim
52 words
A fan as set forth in claim 1, wherein said clamping member passes through the opening in said root portion with sufficient clearance to permit angular displacement of said root portion relative to the associated ribs about said second axes without removal of said clamping member when said clamping means is released.
Claim 6
Dependent Claim
30 words
A fan as set forth in claim 2, wherein the second axes of the seating faces of the two ribs associated with the same root portion coincide in said position.
Claim 7
Dependent Claim
28 words
A fan as set forth in claim 3, wherein not more than one clamping member passes through each root portion, the associated opposite ribs, and said shell members.
Claim 8
Dependent Claim
28 words
A fan as set forth in claim 3, wherein said second axes are inclined at a small acute angle relative to a plane perpendicular to said first axis.
Claim 9
Dependent Claim
29 words
A fan as set forth in claim 1, wherein said shell members are identical and symmetrical relative to a plane perpendicular to said first axis when in said position.
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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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |