Patent US4775294A successfully refreshed from Google Patents.
US4775294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular centrifugal fan
Assignee: Twin City Fan and Blower Co
•
Filing: 1982-08-23
•
Granted: 1988-10-04
•
Expires: 2002-08-23
Abstract
Abstract A centrifugal fan having a tubular housing in which an inlet funnel and fan assembly are contained. The fan assembly includes a fan wheel with the fan wheel inlet and inlet funnel overlapping during normal fan operation. A motor is connected to drive the fan wheel and a door is provided for access to the inside of the housing, the fan wheel assembly and motor being supported by the door for movement therewith. Within the present invention, the door further supports the inlet funnel in overlapping relation with the fan wheel inlet for movement with the door, fan wheel assembly and motor without alteration of the overlapping relation.
Inventors
- 👤 Vincent M. LaPorte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:27
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/441; F04D29/444; F04D29/60; F04D29/62; F04D29/624; F04D29/626; Y; Y10; Y10S; Y10S415/00; Y10S415/912
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
In a centrifugal fan of the type having a tubular housing containing an inlet funnel and a fan assembly including a fan wheel having a fan wheel inlet, the fan wheel inlet and inlet funnel overlapping during normal fan operation, having motor means connected to drive said fan wheel and having a door providing access to the inside of said housing, the fan wheel assembly and motor being supported by said door for movement therewith, the improvement wherein said door further supports said inlet funnel in overlapping relation with said fan wheel inlet for movement with said door, fan wheel assembly and motor without alteration of said overlapping relation.
Claim 2
Dependent Claim
109 words
In a centrifugal fan of the type having a tubular housing containing an inlet funnel and a fan assembly including a fan wheel having a fan wheel inlet, the fan wheel inlet and inlet funnel overlapping during normal fan operation, having motor means connected to drive said fan wheel and having a door providing access to the inside of said housing, the fan wheel assembly and motor being supported by said door for movement therewith, the improvement wherein said door further supports said inlet funnel in overlapping relation with said fan wheel inlet for movement with said door, fan wheel assembly and motor without alteration of said overlapping relation.
Claim 3
Dependent Claim
20 words
The centrifugal fan of claim 1 further comprising straightening vanes within said housing including straightening vanes carried by said door.
Claim 4
Dependent Claim
18 words
The centrifugal fan of claim 2 wherein said door carried straightening vanes provide support for said fan assembly.
Claim 5
Dependent Claim
23 words
The centrifugal fan of claim 1 wherein said tubular housing is generally cylindrical, said door being arcuate having an arc of approximately 180°.
Claim 6
Dependent Claim
28 words
The centrifugal fan of claim 1 further comprising inlet funnel support means carried by said door and surrounding said inlet funnel while allowing fluid flow through said funnel.
Claim 7
Dependent Claim
35 words
The centrifugal fan of claim 5 further comprising means carried by said housing and mating with said inlet funnel support means for sealing against fluid flow outside said inlet funnel when said door is closed.
Claim 8
Dependent Claim
20 words
The centrifugal fan of claim 6 further comprising straightening vanes within said housing including straightening vanes carried by said door.
Claim 9
Dependent Claim
18 words
The centrifugal fan of claim 7 wherein said door carried straightening vanes provide support for said fan assembly.
Claim 10
Dependent Claim
23 words
The centrifugal fan of claim 8 wherein said tubular housing is generally cylindrical, said door being arcuate having an arc of approximately 180°.
Claim 11
Dependent Claim
19 words
The centrifugal fan of claim 9 wherein said motor is carried by said door outside of said tubular housing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |