Patent US3628888A successfully refreshed from Google Patents.
US3628888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light weight fan assembly
Assignee: Brookside Corp
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Filing: 1970-02-24
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Granted: 1971-12-21
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Expires: 1990-02-24
Abstract
Abstract Disclosed is a fan assembly in which each fan blade is formed by overlying, thin plates which receive, between them, the extending end portion of a fan spider arm, the laminated assembly thus formed being riveted together to provide a light weight, yet rigid, fan spider and blade assembly.
Inventors
- 👤 John A Wooden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:33
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/388
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
163 words
A fan assembly of the type which includes a fan spider having a plurality of transversely curved radially extending arms with a fan blade attached to each of the arms, wherein the improvement comprises each fan blade being formed by two overlying relatively thin plates, one of said plates having a transverse curvature corresponding to the curvature of said arms and the other of said plates extending across the concave face of said one plate, said other of said plates being attached along its periphery to said one plate but unattached thereto at the end closest the axis of rotation of the fan assembly, the end portion of the corresponding spider arm extending between said plates at their unattached ends, abutment means carried by one of said plates engaging the margin of said extending spider arm portion to locate and align the fan blade on the spider, and fastening means rigidly laminating together said plates and the interposed portion of the spider arm.
Claim 2
Dependent Claim
163 words
A fan assembly of the type which includes a fan spider having a plurality of transversely curved radially extending arms with a fan blade attached to each of the arms, wherein the improvement comprises each fan blade being formed by two overlying relatively thin plates, one of said plates having a transverse curvature corresponding to the curvature of said arms and the other of said plates extending across the concave face of said one plate, said other of said plates being attached along its periphery to said one plate but unattached thereto at the end closest the axis of rotation of the fan assembly, the end portion of the corresponding spider arm extending between said plates at their unattached ends, abutment means carried by one of said plates engaging the margin of said extending spider arm portion to locate and align the fan blade on the spider, and fastening means rigidly laminating together said plates and the interposed portion of the spider arm.
Claim 3
Dependent Claim
56 words
A fan assembly as claimed in claim 1 in which said abutment means comprises a single protrusion formed at the inner face of one of said plates and the extending tip of said spider arm is provided with a generally V-shaped notch accommodating said protrusion for locating and aligning the fan blade on the spider arm.
Claim 4
Dependent Claim
80 words
A fan assembly as claimed in claim 1 in which one of said plates carries tabs on each side of said extending portion of the fan spider, said tabs being bent toward and into engagement with the inner surface of the other plate to thereby substantially seal the space between the plates adjacent the extending portion of the fan spider against the entry of dirt or the like and aiding in the radial alignment of the blade and spider arm.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |