US3893555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary fans
Assignee: Dynair Ltd
•
Filing: 1974-03-08
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Granted: 1975-07-08
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Expires: 1994-03-08
Abstract
Abstract A variable speed thermostatically controlled cooling fan for an internal combustion motor, especially for an automobile. Within the fan hub is incorporated a viscous slipping clutch including an inner rotary member contained within an outer fluid casing. Fluid can be withdrawn from the casing to a central reservoir by means of scoops and the flow of fluid is controlled by a valve which may be actuated by a bi metal strip incorporated in the fan hub, or by a pneumatic piston located in the hub and controlled from a remote thermal sensing valve.
Inventors
- 👤 Arthur Ernest Henry Elmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:13
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34; F01; F01P; F01P7/00; F01P7/02; F01P7/04; F01P7/042; F16; F16D; F16D35/00; F16D35/02; F16D35/021; F16D35/026
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
180 words
A rotary cooling fan including a variable speed torsion drive, comprising an annular casing provided with means for connection to an input drive shaft at one end, an output shaft extending through a central aperture at the other end of said casing and having a plurality of fan blades Secured thereto, an inner rotary body located within said casing and secured to said output shaft, said rotary body and said casing being formed with cooperating closely spaced surfaces defining a clearance space, means for retaining a quantity of a viscous liquid in the space between said surfaces, a liquid reservoir formed within said rotary body or in said output shaft, scoop means mounted on said inner body for impelling liquid from said clearance space to said reservoir as a result of relative rotation between said rotary body and casing, valve means controlling the return flow of liquid from said reservoir to said clearance space, a temperature responsive element located externally of said casing, and actuating means for operating said valve in response to sensed changes of temperature by said element.
Claim 2
Dependent Claim
180 words
A rotary cooling fan including a variable speed torsion drive, comprising an annular casing provided with means for connection to an input drive shaft at one end, an output shaft extending through a central aperture at the other end of said casing and having a plurality of fan blades Secured thereto, an inner rotary body located within said casing and secured to said output shaft, said rotary body and said casing being formed with cooperating closely spaced surfaces defining a clearance space, means for retaining a quantity of a viscous liquid in the space between said surfaces, a liquid reservoir formed within said rotary body or in said output shaft, scoop means mounted on said inner body for impelling liquid from said clearance space to said reservoir as a result of relative rotation between said rotary body and casing, valve means controlling the return flow of liquid from said reservoir to said clearance space, a temperature responsive element located externally of said casing, and actuating means for operating said valve in response to sensed changes of temperature by said element.
Claim 3
Dependent Claim
32 words
A rotary cooling fan according to claim 1, in which said casing is formed with external cooling fins, and said fan blades are supported from said drive shaft through an elastomeric mounting.
Claim 4
Dependent Claim
20 words
A rotary cooling fan according to claim 1, in which said reservoir is positioned centrally on the axis of rotation.
Claim 5
Dependent Claim
20 words
A rotary cooling fan according to claim 1, in which said temperature responsive element is mounted on said output shaft.
Claim 6
Dependent Claim
23 words
A rotary cooling fan according to claim 1, in which said temperature responsive element is connected to said valve through a force-multiplying device.
Claim 7
Dependent Claim
18 words
A rotary cooling fan according to claim 1, in which said temperature responsive element is a bimetallic device.
Claim 8
Dependent Claim
18 words
A rotary cooling fan according to claim 1, in which said rotary body is a thin annular plate.
Claim 9
Dependent Claim
44 words
A rotary cooling fan according to claim 1, in which said scoop means for impelling liquid from the clearance space towards the reservoir is positioned on the peripheral edge surface of said rotary body, and associated with a flow passage leading into said reservoir.
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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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |