Patent US5458465A successfully refreshed from Google Patents.
US5458465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan impeller
Assignee: Balcke Duerr GmbH
•
Filing: 1994-02-02
•
Granted: 1995-10-17
•
Expires: 2014-02-02
Abstract
Abstract A fan impeller has a hub and fan blade units with fan blades connected to the hub. The fan blade units are made of plastic material reinforced with first fibers for transmitting forces acting on the fan blades into the hub. The first fibers extend substantially parallel to a longitudinal direction of the fan blades. The first fibers are bundled at a radially inner end of the fan blades to form a tubular structure. The tubular structure has a free end that is bent radially outwardly substantially about 180° to form an end ring. The end ring has a convex surface facing the hub and a concave surface facing the fan blade. Each fan blade unit has a fastening element with an annular groove for receiving the end ring, the fastening element connected to the hub. Each fan blade unit further has a fastening ring inserted into the concave surface. The fastening ring clamps the end ring at the fastening element. Screws extend through the fastening ring, the end ring, and the fastening element for connecting the blade unit to the hub.
Inventors
- 👤 Carlos W. Von Wieser
- 👤 Huba ry
- 👤 Hans-Joachim Wohler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:42
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/02; F04D29/023; F04D29/26; F04D29/32; F04D29/38; F05; F05D; F05D2300/00; F05D2300/40; F05D2300/43; F05D2300/60; F05D2300/603
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
236 words
A fan impeller comprising: a hub with a flange; fan blade units with a fan blade connected to said hub and made of plastic material reinforced with first fibers for transmitting forces acting on said fan blades into said hub; said first fibers extending substantially parallel to a longitudinal direction of said fan blade units; said first fibers being bundled at a radially inner end of said fan blade to form a tubular structure; said tubular structure having a free end that is bent radially outwardly and reversed in direction to form an end ring; said end ring having a convex surface facing said hub and a concave surface facing said fan blade; each said fan blade unit having a fastening element with an annular groove for receiving said end ring, said fastening element connected to said flange of said hub and said annular groove having an inner contour matching said convex surface of said end ring; each said fan blade unit having a fastening ring inserted into said concave surface, wherein the surface of said fastening ring inserted into said concave surface matches said concave surface of said end ring; and screws extending through said fastening ring, said end ring, said fastening element, and said flange of said hub for clamping said end ring between said fastening ring and said fastening element to thereby fasten said fan blade units to said flange of said hub.
Claim 2
Dependent Claim
236 words
A fan impeller comprising: a hub with a flange; fan blade units with a fan blade connected to said hub and made of plastic material reinforced with first fibers for transmitting forces acting on said fan blades into said hub; said first fibers extending substantially parallel to a longitudinal direction of said fan blade units; said first fibers being bundled at a radially inner end of said fan blade to form a tubular structure; said tubular structure having a free end that is bent radially outwardly and reversed in direction to form an end ring; said end ring having a convex surface facing said hub and a concave surface facing said fan blade; each said fan blade unit having a fastening element with an annular groove for receiving said end ring, said fastening element connected to said flange of said hub and said annular groove having an inner contour matching said convex surface of said end ring; each said fan blade unit having a fastening ring inserted into said concave surface, wherein the surface of said fastening ring inserted into said concave surface matches said concave surface of said end ring; and screws extending through said fastening ring, said end ring, said fastening element, and said flange of said hub for clamping said end ring between said fastening ring and said fastening element to thereby fasten said fan blade units to said flange of said hub.
Claim 3
Dependent Claim
23 words
A fan impeller according to claim 1, wherein said fastening element has a centering projection projecting into the interior of said tubular structure.
Claim 4
Dependent Claim
16 words
A fan impeller according to claim 1, wherein said fastening element is made of plastic material.
Claim 5
Dependent Claim
16 words
A fan impeller according to claim 1, wherein said fastening ring is made of plastic material.
Claim 6
Dependent Claim
20 words
A fan impeller according to claim 1, wherein said fastening ring and said fastening element are made of plastic material.
Claim 7
Dependent Claim
36 words
A fan impeller according to claim 1, further comprising ring segments positioned on said fastening ring, wherein said screws extend through said ring segments, said fastening ring, said end ring, said fastening element and said flange.
Claim 8
Dependent Claim
15 words
A fan impeller according to claim 1, wherein said tubular structure has an exterior sleeve.
Claim 9
Dependent Claim
22 words
A fan impeller according to claim 7, wherein said exterior sleeve is reinforced by second fibers extending transverse to said first fibers.
References Cited (Backward Citations)
GB163536A
Cited
GB165548A
Cited
FR835724A
Cited
US2155375A
Cited
US2182812A
Cited
FR2129364A5
Cited
US4407635A
Cited
US4260332A
Cited
US4915590A
Cited
US4966527A
Cited
US5096384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-16 | 1999-04-17 | 1999-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-16 | 2003-04-17 | 2003-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-16 | 2007-04-17 | 2007-10-17 | $7700.00 | Window Closed / Lapsed |