Patent US5244347A successfully refreshed from Google Patents.
US4345877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial flow fans and blades therefor
Assignee: Hudson Products Corp
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Filing: 1980-04-04
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Granted: 1982-08-24
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Expires: 2000-04-04
Abstract
Abstract There is disclosed an axial flow fan having blades which are made up of metallic inner portions attached to the hub of the fan, and outer plastic portions whose inner ends are secured to the outer ends of the metallic portion. The plastic portions are hollow and have an exterior surface of air foil cross section, and seal discs on one side of the hub extend outwardly therefrom to approximately the intersection of the metallic and plastic portions.
Inventors
- 👤 Robert C. Monroe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:08
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/388
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
147 words
An axial flow fan, comprising a rotatable hub, a seal disc on one side of the hub extending outwardly from the periphery of the hub, a plurality of blades each extending radially from the hub, each blade comprising a metallic portion having a neck which is attached to the hub, and a reinforced plastic portion which has an exterior air foil cross section, and which is made of one hollow piece which decreases in width in a direction from its inner to its outer end, the outer end of the metallic portion fitting a relatively short distance into and being of substantially less width than the inner open end of the plastic portion, and fasteners securing the interfitting ends of the blade portions to one another, the outer periphery of the seal disc extending outwardly to approximately the inner ends of the plastic portion of the blades.
Claim 2
Dependent Claim
147 words
An axial flow fan, comprising a rotatable hub, a seal disc on one side of the hub extending outwardly from the periphery of the hub, a plurality of blades each extending radially from the hub, each blade comprising a metallic portion having a neck which is attached to the hub, and a reinforced plastic portion which has an exterior air foil cross section, and which is made of one hollow piece which decreases in width in a direction from its inner to its outer end, the outer end of the metallic portion fitting a relatively short distance into and being of substantially less width than the inner open end of the plastic portion, and fasteners securing the interfitting ends of the blade portions to one another, the outer periphery of the seal disc extending outwardly to approximately the inner ends of the plastic portion of the blades.
Claim 3
Dependent Claim
39 words
A fan of the character defined in claim 1, wherein the outer end of the metallic portion of each blade is hollow and includes relatively flat, spaced-apart sides fitting closely against correspondingly shaped inner walls of the blade portion.
Claim 4
Dependent Claim
35 words
A fan of the character defined in claim 1, including a barrier of relatively lightweight material extending across the interior of the plastic portion of each blade near the outer end of the metallic portion.
Claim 5
Dependent Claim
41 words
A fan of the character defined in claim 1, wherein the fasteners are manipulated from within the interfitting ends of the metallic and plastic portions of each blade, and the metallic portion has openings therein to permit access to the fasteners.
Claim 6
Dependent Claim
66 words
A fan of the character defined in claim 4, wherein the metallic portion of each blade includes a pair of elongate sheets whose inner ends are approximately semi-circular and whose outer ends are substantially flat, a ring surrounds and is fixed to the outer ends of sheets, and the longitudinal edges of the sheets flare from their inner to their outer ends to form said openings.
Claim 7
Dependent Claim
95 words
A blade for an axial flow fan, comprising a one-piece, reinforced plastic portion having an exterior air foil cross section and a hollow interior which decreases in width in a direction from its inner end to its outer end, a metallic portion having a neck at its inner end for attachment to the hub of the fan and an outer end which fits a relatively short distance into and is of substantially less width than the inner open end of said plastic portion, and fasteners securing the interfitting ends of such portions to one another.
Claim 8
Dependent Claim
95 words
A blade for an axial flow fan, comprising a one-piece, reinforced plastic portion having an exterior air foil cross section and a hollow interior which decreases in width in a direction from its inner end to its outer end, a metallic portion having a neck at its inner end for attachment to the hub of the fan and an outer end which fits a relatively short distance into and is of substantially less width than the inner open end of said plastic portion, and fasteners securing the interfitting ends of such portions to one another.
Claim 9
Dependent Claim
32 words
A blade of the character defined in claim 6, including a barrier of relatively lightweight material extending across the interior of the plastic portion near the outer end of the metallic portion.
Claim 10
Dependent Claim
16 words
A blade of the character defined in claim 6, wherein the metallic portion is also hollow.
Claim 11
Dependent Claim
41 words
A blade of the character defined in claim 8, wherein the fasteners are manipulated from within the interfitting ends of the metallic and plastic portions of each blade, and the metallic portions has openings therein to permit access to the fasteners.
Claim 12
Dependent Claim
66 words
A blade of the character defined in claim 9, wherein said metallic portion of each blade includes a pair of elongate sheets whose inner ends are approximately semi-circular and whose outer ends are substantially flat, a ring surrounds and is fixed to the outer ends of sheets, and the longitudinal edges of the sheets flare from their inner to their outer ends to form said openings.
Claim 13
Dependent Claim
39 words
A blade of the character defined in claim 6, wherein the outer end of the metallic portion of each blade is hollow and includes relatively flat, spaced-apart sides fitting closely against correspondingly shaped inner walls of the blade portion.
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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) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |