US3846043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blower wheel
Assignee: Broan Nutone LLC
•
Filing: 1973-03-12
•
Granted: 1974-11-05
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Expires: 1993-03-12
Abstract
Abstract A blower wheel of the squirrel cage type having increased efficiency includes forward curved fan blades having backward curved feeder vanes.
Inventors
- 👤 D Wolbrink
- 👤 R Busch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:50
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/281
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
A motor driven, rotary blower wheel comprising: a flat circular base lying in a plane perpendicular tO the axis of rotation and to a stream of inlet air; a plurality of uniformly spaced fan blades mounted on the perimeter of said base normal to its plane, said fan blades being forward curved with respect to the direction of rotation of said blower wheel for exhausting a peripheral stream of outlet air; a conical hub mounted in the center of said base, said hub being of a size sufficient to form, with said base, a means for diverting the stream of air through the blower wheel; and a plurality of backward curved feeder vanes mounted on said base normal to its plane, said vanes extending between said hub and said blades along portions of non-diametrical chords of said base and having ends joined to said hub in a generally tangential manner, said vanes further having ramplike inner portions for providing an initial spin to the air stream while avoiding torque loading of the motor and flaring portions joining said blades.
Claim 2
Dependent Claim
179 words
A motor driven, rotary blower wheel comprising: a flat circular base lying in a plane perpendicular tO the axis of rotation and to a stream of inlet air; a plurality of uniformly spaced fan blades mounted on the perimeter of said base normal to its plane, said fan blades being forward curved with respect to the direction of rotation of said blower wheel for exhausting a peripheral stream of outlet air; a conical hub mounted in the center of said base, said hub being of a size sufficient to form, with said base, a means for diverting the stream of air through the blower wheel; and a plurality of backward curved feeder vanes mounted on said base normal to its plane, said vanes extending between said hub and said blades along portions of non-diametrical chords of said base and having ends joined to said hub in a generally tangential manner, said vanes further having ramplike inner portions for providing an initial spin to the air stream while avoiding torque loading of the motor and flaring portions joining said blades.
Claim 3
Dependent Claim
32 words
The blower wheel according to claim 1 wherein the ramp-like inner portions of said feeder vanes increase in height in direct proportion to the distance from the hub toward the fan blades.
Claim 4
Dependent Claim
28 words
The blower wheel according to claim 2 wherein the ramp-like inner portions have slanting upper edges disposed normal to the stream of air diverted through the blower wheel.
Claim 5
Dependent Claim
48 words
The blower wheel according to claim 1 wherein said fan blades exhaust the peripheral stream of outlet air at an acute angle with respect to the base and said fan blades have edges perpendicular to the stream of exhaust air and disposed at an angle to said base.
Claim 6
Dependent Claim
29 words
The blower wheel according to claim 3 wherein said conical hub has a height approximately equal to the maximum height of the ramp-like inner portions of said feeder vanes.
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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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |