US3904314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impeller wheel for an axial flow fan
Assignee: Novenco Building and Industry AS
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Filing: 1973-12-27
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Granted: 1975-09-09
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Expires: 1993-12-27
Abstract
Abstract An impeller wheel for an axial flow fan the vanes of which are arranged in circumferentially spaced apertures in a hollow hub so as to be turnable about their longitudinal axis to adjust the pitch setting of each vane. Each of the apertures is formed with outer and inner counterbored portions and an intermediate central portion, a base portion of one vane and a retaining member being inserted in the outer and inner counterbored portions, respectively, and being connected by bolt means. All retaining members are biased towards the central portions of the apertures by adjustable spring means arranged inside the hollow hub.
Inventors
- 👤 Henry Valdemar Pedersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:17
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34; F04D29/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
357 words
In an impeller wheel for an axial flow fan, having a hollow impeller hub with a central bore for the shaft of a fan driving motor and a plurality of circumferentially spaced apertures extending between the outer and inner surfaces of the hub at right angles to the axis of the central bore, each of said apertures being formed with outer and inner counterbored portions at the outer and inner surfaces of the hub, respectively, and a central portion of restricted crosssectional area between said counterbored portions; a plurality of vanes, each of which is formed with a discshaped base portion having a cross-sectional area exceeding the restricted cross-sectional area of the central portion of each aperture, said base portion being inserted in the outer counterbored portion of an individual one of said apertures; a plurality of flat and disc-shaped retaining members having a cross-sectional area exceeding the restricted cross-sectional area of the central portion of each aperture, each of said retaining members being inserted in the inner counterbore portion of an individual one of said apertures and each having a central bore therethrough; spacer means filling out the central portion of each aperture between the vane base portion and the retaining member inserted therein; and bolt means for connecting the vane base portion in each aperture with the retaining member in the same aperture; the improvement wherein adjustable spring mEans are arranged inside the hollow hub for biasing each retaining member towards the central portion of its associated aperture, said adjustable spring means comprising: a. a central hub member arranged inside the impeller hub; b. a plurality of arms extending radially from said central hub member into the central bores of the retaining members, each arm having a threaded end adjacent the retaining members; c. a nut member threadingly engaged on the threaded end of each arm, said nut member having the radially outward end of a diameter smaller than that of the central bore of the retaining member and an enlarged collar portion on the other end; and d. a spring disposed between said enlarged collar portion of said nut member and said retaining member.
Claim 2
Dependent Claim
357 words
In an impeller wheel for an axial flow fan, having a hollow impeller hub with a central bore for the shaft of a fan driving motor and a plurality of circumferentially spaced apertures extending between the outer and inner surfaces of the hub at right angles to the axis of the central bore, each of said apertures being formed with outer and inner counterbored portions at the outer and inner surfaces of the hub, respectively, and a central portion of restricted crosssectional area between said counterbored portions; a plurality of vanes, each of which is formed with a discshaped base portion having a cross-sectional area exceeding the restricted cross-sectional area of the central portion of each aperture, said base portion being inserted in the outer counterbored portion of an individual one of said apertures; a plurality of flat and disc-shaped retaining members having a cross-sectional area exceeding the restricted cross-sectional area of the central portion of each aperture, each of said retaining members being inserted in the inner counterbore portion of an individual one of said apertures and each having a central bore therethrough; spacer means filling out the central portion of each aperture between the vane base portion and the retaining member inserted therein; and bolt means for connecting the vane base portion in each aperture with the retaining member in the same aperture; the improvement wherein adjustable spring mEans are arranged inside the hollow hub for biasing each retaining member towards the central portion of its associated aperture, said adjustable spring means comprising: a. a central hub member arranged inside the impeller hub; b. a plurality of arms extending radially from said central hub member into the central bores of the retaining members, each arm having a threaded end adjacent the retaining members; c. a nut member threadingly engaged on the threaded end of each arm, said nut member having the radially outward end of a diameter smaller than that of the central bore of the retaining member and an enlarged collar portion on the other end; and d. a spring disposed between said enlarged collar portion of said nut member and said retaining member.
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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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |