Patent US3842902A successfully refreshed from Google Patents.
US3842902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Labyrinthian fan
Assignee: Hayes-Albion Corp
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Filing: 1973-07-05
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Granted: 1974-10-22
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Expires: 1993-07-05
Abstract
Abstract An improved fan including means to form a seal at the fan tips and means to form a labyrinthian seal in the shroud gap. The combination of seals increases the effective airflow of the fan, reduces the operational noise, and reduces the horsepower required to drive the fan.
Inventors
- 👤 W Poslusny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:43
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/16; F04D29/161; F04D29/164; F01; F01D; F01D11/00; F01D11/08; F04D29/26; F04D29/32; F04D29/325; F04D29/326
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
In an automotive cooling system the combination comprising: a heat exchanger and an automotive engine mounted for both axial and radial movement with respect to each other; a fan rotatably mounted to said engine and having a plurality of blades and including sealing means for creating a labyrinth seal; and a shroud mounted to said heat exchanger and encircling said fan, said shroud having means for coacting with said sealing means on said fan to form a labyrinth seal in the gap between said shroud and said fan; said means on said fan and said shroud which form said labyrinth seal being disposed such that relative axial and radial movement therebetween does not interfere with the rotation of said fan.
Claim 2
Dependent Claim
120 words
In an automotive cooling system the combination comprising: a heat exchanger and an automotive engine mounted for both axial and radial movement with respect to each other; a fan rotatably mounted to said engine and having a plurality of blades and including sealing means for creating a labyrinth seal; and a shroud mounted to said heat exchanger and encircling said fan, said shroud having means for coacting with said sealing means on said fan to form a labyrinth seal in the gap between said shroud and said fan; said means on said fan and said shroud which form said labyrinth seal being disposed such that relative axial and radial movement therebetween does not interfere with the rotation of said fan.
Claim 3
Dependent Claim
33 words
The system set forth in claim 1 wherein said sealing means is a U-shaped hoop circumferentially disposed about said fan blades and said coacting means is an inwardly turned flange on said shroud.
Claim 4
Dependent Claim
24 words
The system set forth in claim 2 wherein the tip of said flange is substantially aligned with the tips of said U-shaped sealing means.
Claim 5
Dependent Claim
23 words
The system set forth in claim 2 wherein the tip of said flange is disposed within the bight of said U-shaped sealing means.
Claim 6
Dependent Claim
126 words
In an automotive cooling system the combination comprising: a radiator and an automotive engine mounted for movement with respect to each other; a fan rotatably mounted to said engine and having a pluarlity of blades and including a substantially U-shaped hoop disposed about the perimeter of said blades for creating a labyrinth seal; and a shroud mounted to said heat exchanger and encircling said fan, said shroud having an inwardly depending flange entering the bight of said hoop for coacting with said hoop to form a labyrinth seal in the gap between said shroud and said fan; said hoop and said flange which form said labyrinth seal being disposed such that relative axial and radial movement therebetween does not interfere with the rotation of said fan.
Claim 7
Dependent Claim
126 words
In an automotive cooling system the combination comprising: a radiator and an automotive engine mounted for movement with respect to each other; a fan rotatably mounted to said engine and having a pluarlity of blades and including a substantially U-shaped hoop disposed about the perimeter of said blades for creating a labyrinth seal; and a shroud mounted to said heat exchanger and encircling said fan, said shroud having an inwardly depending flange entering the bight of said hoop for coacting with said hoop to form a labyrinth seal in the gap between said shroud and said fan; said hoop and said flange which form said labyrinth seal being disposed such that relative axial and radial movement therebetween does not interfere with the rotation of said fan.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |