US5277547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor fan unit
Assignee: Usui Kokusai Sangyo Kaisha Ltd
•
Filing: 1992-05-18
•
Granted: 1994-01-11
•
Expires: 2012-05-18
Abstract
Abstract A twin motor fan unit is provided with two fan members mounted to parallel rotational shafts of a motor. The motor fan unit includes a rectifying plate to partition the fan members. The rectifying plate prevents turbulence at the rear faces of the respective fans that would otherwise be caused by mutual interference of the air stream leaving the fan. As a result, the motor fan unit enables an increased quantity of air to flow through the motor fan unit and also achieves a reduction in operating noise.
Inventors
- 👤 Katsushi Washizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:47
CPC Classifications
F; F04; F04D; F04D25/00; F04D25/16; F04D25/166; F01; F01P; F01P5/00; F01P5/02; F01P5/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A twin fan unit comprising first and second fan members mounted respectively to first and second substantially parallel rotatable shafts, said fan unit having a front side orthogonal to said shafts for receiving air and a rear side orthogonal to said shafts for directing first and second rear streams of air from the respective first and second fan members and generally parallel to the shafts, said twin fan unit further including a rectifying plate disposed intermediate said first and second fan members and projecting rearwardly therefrom, said rectifying plate suppressing mutual interference of the first and second rear streams of the fan members for achieving a smooth flow of air and for reducing noise.
Claim 2
Dependent Claim
114 words
A twin fan unit comprising first and second fan members mounted respectively to first and second substantially parallel rotatable shafts, said fan unit having a front side orthogonal to said shafts for receiving air and a rear side orthogonal to said shafts for directing first and second rear streams of air from the respective first and second fan members and generally parallel to the shafts, said twin fan unit further including a rectifying plate disposed intermediate said first and second fan members and projecting rearwardly therefrom, said rectifying plate suppressing mutual interference of the first and second rear streams of the fan members for achieving a smooth flow of air and for reducing noise.
Claim 3
Dependent Claim
15 words
A twin fan unit as in claim 1, wherein said fan members are substantially coplanar.
Claim 4
Dependent Claim
19 words
A twin fan unit as in claim 1, wherein said rectifying plate is substantially parallel to said rotatable shafts.
Claim 5
Dependent Claim
15 words
A twin fan unit as in claim 3, wherein said rectifying plate is substantially S-shape.
Claim 6
Dependent Claim
15 words
A twin fan unit as in claim 3, wherein said rectifying plate is substantially X-shape.
Claim 7
Dependent Claim
15 words
A twin fan unit as in claim 3, wherein said rectifying plate is substantially Y-shape.
Claim 8
Dependent Claim
15 words
A twin fan unit as in claim 3, wherein said rectifying plate is substantially I-shape.
Claim 9
Dependent Claim
15 words
A twin fan unit as in claim 3, wherein said rectifying plate is substantially Z-shape.
Claim 10
Dependent Claim
36 words
A twin fan unit as in claim 1, wherein said rectifying plate extends partly around the first fan member, said twin fan unit further comprising a second rectifying plate extending partly around the second fan member.
Claim 11
Dependent Claim
17 words
A twin fan unit as in claim 9, wherein said rectifying plates are connected to one another.
Claim 12
Dependent Claim
17 words
A twin fan unit as in claim 9, wherein said rectifying plates are spaced from one another.
References Cited (Backward Citations)
US3366169A
Cited
US3384165A
Cited
JPS54164325A
Cited
JPS60175418A
Cited
JPS6120430A
Cited
JPS61162530A
Cited
US5135046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-10 | 1997-07-12 | 1998-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-10 | 2001-07-12 | 2002-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-10 | 2005-07-12 | 2006-01-11 | $7700.00 | Window Closed / Lapsed |