US4217816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating fans
Assignee: Individual
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Filing: 1978-12-27
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Granted: 1980-08-19
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Expires: 1998-12-27
Abstract
Abstract The ventilating fan is comprised of a centrifugal governor which is driven by the fan impeller for causing a plurality of simultaneously operable pivotable louvers, which are supported by the fan casing, to move to their open position during fan operation. When the fan impeller is stopped, a spring which is interposed between the louvers and the casing caused the louvers to return to their closed position.
Inventors
- 👤 Vittorio Mancinelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:09
CPC Classifications
F; F04; F04D; F04D25/00; F04D25/02; F04D25/08; F04D25/12; F04D25/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
179 words
A tubed axial ventilating fan, comprising a casing which defines an air flow passage having an air flow inlet and an air flow outlet, an electrically driven fan impeller, said fan impeller being carried by an impeller shaft which is rotatably mounted within said casing, a plurality of simultaneously operable pivotable louvers which are disposed in said air flow outlet, spring means between said louvers and said casing for biasing said louvers to a closed condition, and centrifugal governor means which are driven by said fan impeller for causing said louvers to displace to an open condition, against the bias of said spring means, during fan operation, said centrifugal governor means comprising a governor body mounted on said shaft, at least two weights pivotally connected to said body and symmetrically disposed with respect to said shaft, a reciprocable element which is reciprocally mounted on said shaft and connected to said weights by means of pivoted elements and an actuating member rotatably mounted on said reciprocable element and connected to one of said louvers for causing all louvers to operate.
Claim 2
Dependent Claim
179 words
A tubed axial ventilating fan, comprising a casing which defines an air flow passage having an air flow inlet and an air flow outlet, an electrically driven fan impeller, said fan impeller being carried by an impeller shaft which is rotatably mounted within said casing, a plurality of simultaneously operable pivotable louvers which are disposed in said air flow outlet, spring means between said louvers and said casing for biasing said louvers to a closed condition, and centrifugal governor means which are driven by said fan impeller for causing said louvers to displace to an open condition, against the bias of said spring means, during fan operation, said centrifugal governor means comprising a governor body mounted on said shaft, at least two weights pivotally connected to said body and symmetrically disposed with respect to said shaft, a reciprocable element which is reciprocally mounted on said shaft and connected to said weights by means of pivoted elements and an actuating member rotatably mounted on said reciprocable element and connected to one of said louvers for causing all louvers to operate.
Claim 3
Dependent Claim
45 words
A tubed axial ventilating fan as set forth in claim 1, wherein said impeller shaft is hollow, said reciprocable element being provided with a guide rod which is reciprocably mounted within said shaft, an anti-friction bush being interposed between said guide rod and said shaft.
Claim 4
Dependent Claim
25 words
A tubed axial ventilating fan as set forth in claim 2, wherein a roller bearing is interposed between said reciprocable element and said actuating rod.
Claim 5
Dependent Claim
168 words
A tubed axial ventilating fan as set forth in claim 2, wherein said governor body is in form of a bar having a central portion provided with a hub which has an axis orthogonal to said bar, said hub being mounted on said shaft and provided with means for securing said hub to said shaft, said reciprocable element being movable between a rest position, in which said element lies against said bar and said louvers are in their closed condition, and an operative position in which said reciprocable element is spaced apart from said bar so as to cause said actuating rod to hold said louvers in their open condition, said bar, said arms and said pivoted rods being disposed so as to define a rectangle when said reciprocable element is in its operative position, two opposite sides of said rectangle being defined by said arms, another side being defined by said bar and the side opposite thereto being defined by said pivoted rods and said reciprocable element.
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) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |