Patent US3680977A successfully refreshed from Google Patents.
US3680977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Framed impeller
Assignee: Individual
•
Filing: 1970-06-29
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Granted: 1972-08-01
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Expires: 1990-06-29
Abstract
Abstract An impeller with a rotor carrying a set of fan blades has a circular duct of streamlined profile surrounding the rotor blades, the latter having their tips interconnected by a ring received with small clearance in an annular groove on the inner duct periphery so that this periphery is flush with the inner ring surface. Elastic inserts in the gap between the ring and the duct may be used to minimize or eliminate the intervening clearance.
Inventors
- 👤 Denis Rabouyt
- 👤 Charles Louis Marsot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:36
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; B; B64; B64C; B64C11/00; B64C11/001; F04; F04D; F04D29/00; F04D29/08; F04D29/16; F04D29/161; F04D29/164; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
125 words
An impeller for the circulation of an ambient fluid, comprising a rotor with a set of blades radiating from an axis; a circular duct of airfoil cross-section fixedly centered on said axis, said duct having an inner periphery provided with an annular groove and lined with a sheet-metal sheath projecting beyond the edges of said groove to form a pair of annular shoulders within said groove; a ring centered on said axis and interconnecting said blades, said ring projecting radially into said groove with small axial clearance from said shoulders; and sealing means in said groove bridgeing said axial clearance, said sealing means including a pair of elastic annular strips mounted in said groove on said shoulders and extending therefrom into contact with said ring.
Claim 2
Dependent Claim
125 words
An impeller for the circulation of an ambient fluid, comprising a rotor with a set of blades radiating from an axis; a circular duct of airfoil cross-section fixedly centered on said axis, said duct having an inner periphery provided with an annular groove and lined with a sheet-metal sheath projecting beyond the edges of said groove to form a pair of annular shoulders within said groove; a ring centered on said axis and interconnecting said blades, said ring projecting radially into said groove with small axial clearance from said shoulders; and sealing means in said groove bridgeing said axial clearance, said sealing means including a pair of elastic annular strips mounted in said groove on said shoulders and extending therefrom into contact with said ring.
Claim 3
Dependent Claim
25 words
An impeller as defined in claim 1 wherein said ring has a substantially flat inner peripheral surface flush with the inner periphery of said sheath.
Claim 4
Dependent Claim
35 words
An impeller as defined in claim 1 wherein said ring is provided with two outwardly directed radial flanges confronting said shoulders, said strips bearing upon said flanges at locations spaced radially outwardly from said sheath.
References Cited (Backward Citations)
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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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |