US3746465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal fan for handling material
Assignee: Lummus Industries Inc Co
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Filing: 1971-08-11
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Granted: 1973-07-17
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Expires: 1991-08-11
Abstract
Abstract A fan of the centrifugal type especially adapted to handle material without undue working of the same. The invention is directed to a new form of impeller in which there are a plurality of blades, mounted at their inner ends on a shaft, hub or the like, the blades having generally flat sections, the blades being so disposed that when in rotation material which engages the same strikes the flat surfaces thereof and moves outwardly, that is, radially, without overworking, damaging or changing the physical characteristics of the material to any significant extent.
Inventors
- 👤 Doorn D Van
- 👤 W Pease
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:05
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/281; F04D23/00; F04D23/001; F04D23/003
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
For use in a centrifugal fan of the kind having a scroll case with inlet and outlet openings, an impeller comprising: a. a rotatable hub adapted to be mounted in the case generally in axial alignment relative to the inlet opening, b. a back plate secured to and rotatable with the hub, c. a plurality of generally radially disposed blades each of which is generally L-shaped as viewed in cross section thereby providing blades having leading plate portions extending generally radially from the hub in planes parallel to the axis of the hub and trailing plate sections lying in planes generally normal to the axis of the hub, d. the trailing edges of the trailing plate portions of the blades being spaced farther from the back plate than are the leading edges of the same, whereby material which contacts the impeller strikes the rotating generally flat surfaces of said blades, reducing working of the material.
Claim 2
Dependent Claim
155 words
For use in a centrifugal fan of the kind having a scroll case with inlet and outlet openings, an impeller comprising: a. a rotatable hub adapted to be mounted in the case generally in axial alignment relative to the inlet opening, b. a back plate secured to and rotatable with the hub, c. a plurality of generally radially disposed blades each of which is generally L-shaped as viewed in cross section thereby providing blades having leading plate portions extending generally radially from the hub in planes parallel to the axis of the hub and trailing plate sections lying in planes generally normal to the axis of the hub, d. the trailing edges of the trailing plate portions of the blades being spaced farther from the back plate than are the leading edges of the same, whereby material which contacts the impeller strikes the rotating generally flat surfaces of said blades, reducing working of the material.
Claim 3
Dependent Claim
26 words
An impeller as defined in claim 1 in which the trailing plates are convex on the surfaces thereof which are engaged by the material being conveyed.
Claim 4
Dependent Claim
38 words
An impeller as defined in claim 1 in which the leading plates of the blades are flat and in which the trailing plates thereof are convex on the surfaces thereof which are engaged by the material being conveyed.
References Cited (Backward Citations)
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US1011259A
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US1467227A
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US1649161A
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US3147911A
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US3136254A
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US3246605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |