US3692428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal blower
Assignee: General Industries Co
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Filing: 1970-01-12
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Granted: 1972-09-19
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Expires: 1990-01-12
Abstract
Abstract A centrifugal blower has a frusto-conical end wall with a central hub and a plurality of elongated blades disposed parallel with the hub axis and carried around the outer periphery of the end wall. A continuous ring is connected to the distal ends of the blades with portions of the blades projecting both radially inwardly and outwardly of the ring. End edge portions of the blades adjacent to the end wall project radially outwardly beyond the periphery of the end wall and are both tapered backwardly in the opposite axial direction and beveled.
Inventors
- 👤 Daniel F Bubb
- 👤 James M Callihan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:12
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/281; F04D29/282; F05; F05B; F05B2250/00; F05B2250/10; F05B2250/19; F05B2250/192
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
151 words
A centrifugal blower of molded plastic construction having a frusto-conical end wall of substantially uniform thickness whereby said wall is generally convex in one axial direction; said end wall having a circular outer peripheral edge portion; a plurality of elongated, circumferentially spaced blades projecting parallel with the axis of said blower in said one direction, said blades curved about axes parallel with the axis of said end wall and having inner portions thereof overlapping and secured to said outer peripheral edge portion and being of such width as to extend radially outwardly of said peripheral edge; the outwardly extending portions of the axially directed end edges of said blades adjacent to said end wall being tapered in said direction beyOnd said peripheral edge and having an outer bevel thereon; the distal ends of said blades being joined by an integral ring, said blades projecting radially inwardly and outwardly of said ring.
Claim 2
Dependent Claim
151 words
A centrifugal blower of molded plastic construction having a frusto-conical end wall of substantially uniform thickness whereby said wall is generally convex in one axial direction; said end wall having a circular outer peripheral edge portion; a plurality of elongated, circumferentially spaced blades projecting parallel with the axis of said blower in said one direction, said blades curved about axes parallel with the axis of said end wall and having inner portions thereof overlapping and secured to said outer peripheral edge portion and being of such width as to extend radially outwardly of said peripheral edge; the outwardly extending portions of the axially directed end edges of said blades adjacent to said end wall being tapered in said direction beyOnd said peripheral edge and having an outer bevel thereon; the distal ends of said blades being joined by an integral ring, said blades projecting radially inwardly and outwardly of said ring.
Claim 3
Dependent Claim
23 words
A centrifugal blower as set forth in claim 1: said ring having an inner diameter greater than the diameter of said end wall.
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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |