US4957414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan and hub assembly
Assignee: FLEX-A-LITE A WASHINGTON CORP
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Filing: 1988-12-29
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Granted: 1990-09-18
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Expires: 2008-12-29
Abstract
Abstract A fan and hub assembly (60) having a plastic fan structure (62) molded to a hub (66) to achieve a predetermined resonance frequency. The hub (66) has a plurality of integrally formed arms (84) having one of more openings (88) of a predetermined size and predetermined location for permitting the flow-through of the plastic and to achieve a predetermined resonance frequency of the fan blades (64). A plurality of openings (86) are formed in the hub body (82) to permit the flow-through of liquid plastic to achieve a strong attachment of the blade root (76) to the hub (66).
Inventors
- 👤 Rainer O. Willingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:15
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/325; F04D29/329; B; B29; B29C; B29C45/00; B29C45/0025; F04D29/66; F04D29/661; F04D29/668; B29C45/14; B29C45/14311; B29L; B29L2031/00; B29L2031/08; B29L2031/087
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A method for producing a fan hub for supporting a plurality of molded plastic fan blades, comprising the steps of: forming a disc-shaped body having opposing sides, an outside edge, and a plurality of arms; forming a plurality of openings in said disc-shaped body for permitting fluid communication from said opposing sides to facilitate attachment of the fan blades to the hub; forming one or more openings in each of said arms, the size and position of said openings being selected to establish a predetermined resonant frequency in an assembly consisting of said fan hub and said plurality of molded plastic fan blades, said predetermined resonant frequency being different than the frequency of periodic forces that act upon said assembly when said assembly operates in its intended environment; and thereafter molding fan blades to said disc-shaped body.
Claim 2
Independent Claim
137 words
A method for producing a fan hub for supporting a plurality of molded plastic fan blades, comprising the steps of: forming a disc-shaped body having opposing sides, an outside edge, and a plurality of arms; forming a plurality of openings in said disc-shaped body for permitting fluid communication from said opposing sides to facilitate attachment of the fan blades to the hub; forming one or more openings in each of said arms, the size and position of said openings being selected to establish a predetermined resonant frequency in an assembly consisting of said fan hub and said plurality of molded plastic fan blades, said predetermined resonant frequency being different than the frequency of periodic forces that act upon said assembly when said assembly operates in its intended environment; and thereafter molding fan blades to said disc-shaped body.
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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) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |