NZ759667B2 - A ceiling fan having retracting blades - Google Patents
A ceiling fan having retracting bladesInfo
- Publication number
- NZ759667B2 NZ759667B2 NZ759667A NZ75966719A NZ759667B2 NZ 759667 B2 NZ759667 B2 NZ 759667B2 NZ 759667 A NZ759667 A NZ 759667A NZ 75966719 A NZ75966719 A NZ 75966719A NZ 759667 B2 NZ759667 B2 NZ 759667B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- fan
- blade
- swing arm
- connection
- proximal
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/088—Ceiling fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/34—Blade mountings
- F04D29/36—Blade mountings adjustable
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/34—Blade mountings
- F04D29/36—Blade mountings adjustable
- F04D29/362—Blade mountings adjustable during rotation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
- F21V33/0088—Ventilating systems
- F21V33/0096—Fans, e.g. ceiling fans
Abstract
ceiling fan has retracting blades wherein each blade is coupled to a rotor assembly thereof by first and second pivots defining first and second axes respectively such that each blade is able to swing outwardly about the first axis under inertial force and rise about the second axis under aerodynamic lift force to find an optimal rotational position which eliminates or at least substantially reduces imbalance and negates having to employ blade synchronisation gearing.
Claims (23)
1. A ceiling fan comprising a rotor assembly and a plurality of blades coupled thereto by first and second pivots defining first and second axes respectively such that, when the rotor assembly rotates, each blade swings outwardly about the first axis under inertial force and rises about the second axis under aerodynamic lift force.
2. A fan as claimed in claim 1, wherein each blade is independently coupled to the rotor assembly.
3. A fan as claimed in claim 1 or claim 2, wherein the first axis is generally vertical.
4. A fan as claimed in claim 3, wherein the second axis is generally horizontal.
5. A fan as claimed in claim 4, wherein the second axis is generally orthogonal with respect to the first axis.
6. A fan as claimed in any one of the preceding claims, wherein the first pivot is further from the rotor assembly as compared to the second pivot and wherein the first pivot is lower than the second pivot.
7. A fan as claimed in any one of the preceding claims, further comprising a swing arm interfacing each blade and the rotor assembly.
8. A fan as claimed in claim 7, wherein each swing arm defines a proximal swing arm connection for connection to the rotor assembly and a distal swing arm connection for connection to a respective blade and wherein the proximal swing arm connection forms part of the second pivot and the distal swing arm connection forms part of the first pivot.
9. A fan as claimed in claim 8, wherein the proximal swing arm connection comprises flanges having corresponding apertures having an axle pin therethrough pivotally coupling the proximal swing arm connection to the rotor assembly.
10. A fan as claimed in claim 8, wherein the proximal swing arm connection is above the distal swing arm connection.
11. A fan as claimed in claim 10, wherein the swing arm is angled, extending down from the proximal swing arm connection and then outwardly to the distal swing arm connection.
12. A fan as claimed in any one of claims 8 to 11, further comprising a limiter to limit the swing of the blade about the distal swing arm connection.
13. A fan as claimed in claim 12, wherein a proximal end of the blade comprises a proximal blade connection and wherein the limiter comprises a limiter projection which moves with the proximal blade connection to strike against a corresponding edge of the distal swing arm connection.
14. A fan as claimed in claim 13, further comprising a bearing interfacing the distal swing arm connection and the proximal blade connection.
15. A fan as claimed in claim 8, wherein a proximal end of the blade comprises a proximal blade connection for connection to the distal swing arm connection and wherein the proximal blade connection comprises a cup formation sunk through an upper surface of the blade, the cup formation comprising a planar base which rotates against a corresponding planar portion of the distal swing arm connection.
16. A fan as claimed in any one of the preceding claims, further comprising a biasing mechanism to pull each blade in towards a retracted position.
17. A fan as claimed in any one of the preceding claims, wherein the blades do not overlap when in a retracted configuration.
18. A fan as claimed in claim 17, wherein distal ends of each blade comprise a cutaway to accommodate a proximal end of an adjacent blade.
19. A fan as claimed in claim 18, wherein the cutaway is generally semicircular.
20. A fan as claimed in any one of the preceding claims, wherein each blade comprises a semicircular trailing edge such that, in a stowed configuration, the blades form a circular periphery.
21. A fan as claimed in claim 20, further comprising a base plate and wherein the circular periphery does not extend beyond a periphery of the baseplate.
22. A fan as claimed in any one of the preceding claims, wherein the fan comprises three blades.
23. A fan as claimed in claim 22, wherein each blade comprises an angle of attack curvature.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920687228.0U CN210196068U (en) | 2019-05-14 | 2019-05-14 | Fan and fan lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ759667A NZ759667A (en) | 2025-05-30 |
| NZ759667B2 true NZ759667B2 (en) | 2025-09-02 |
Family
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