BLADES OF A CEILING FAN (1)
The blades of a ceiling fan are respectively provided with a top surface, a bottom surface and a wind-confronting portion obliquely formed along an edge of the top surface and the bottom surface. The wind-confronting portion is composed of two slopes respectively tapered symmetrically from the top surface and the bottom surface to an outmost tip of the blades. No matter if the top surface or the bottom surface faces downward after having the blades fixed with a shaft of a motor, the are a of the wind-confronting portion confronting air is always such minimized that air drag can be lowered. Moreover, with the top surface and the bottom surface attached with different patterns, various pattern combinations can be obtained to diversify the outlook of the ceiling fan.
1. Field of the Invention
This invention relates to a ceiling fan, particularly to one whose blades are respectively provided with a wind-confronting portion that is formed around an edge of a top surface and a bottom surface and composed of two slopes respectively tapered symmetrically from the top surface and the bottom surface to the outmost center of the thickness of the blades, with the top surface and the bottom surface exchangeable.
2. Description of the Prior Art
Commonly, as shown in
However, because the blades 12 are obliquely positioned downward, the wind-confronting portions 121 are to comparatively increase their area confronting air, enabling air drag increased. Moreover, the ceiling fan is usually hung in a living room or where is needed to be esthetically ornamented, it has to be comparatively decorative. But the conventional ceiling fan is always made commonplace, it has to be replaced with a new one in case that it cannot match with a decorative environment, posing a further economic burden.
SUMMARY OF THE INVENTIONThe object of this invention is to offer blades of a ceiling fan able to be overturned to exchange their top surface and bottom surface without downgrading power efficiency.
Each of the blades is provided with a top surface, a bottom surface and a wind-confronting portion obliquely formed along an edge of the top surface and the bottom surface. The wind-confronting portion is composed of two slopes respectively tapered symmetrically from the top surface and the bottom surface to an outmost tip of the blades. No matter if the top surface or the bottom surface faces downward after having the blades fixed with a shaft of a motor, the area of the wind-confronting portion confronting air is always such minimized that air drag can be lowered. Moreover, with the top surface and the bottom surface attached with different patterns, various pattern combinations can be obtained to diversify the outlook of the ceiling fan.
This invention is better understood by referring to the accompanying drawings, wherein:
In order to further understand the structural features, operative techniques and expected effects of the invention, how to use the invention is to be described below.
As shown in
As shown in
The advantages of the invention are described as can be seen from the foresaid description.
With the wind-confronting portion 23 formed in the top surface 21 and the bottom surface 22 to lower air drag, the motor can efficiently work to upgrade rotation. And, with the different patterns attached on the top surface 21 and the bottom surface 22, a variety of the pattern combinations can be achieved to diversify the outlook of the ceiling fan.
While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.
Claims
1. Blades of a ceiling fan, each of said blades made of a plate with a certain thickness and having its one short side pivotally fixed with a shaft of a motor so as to rotate thereof and comprising:
- a top surface and a bottom surface which are formed flat, a wind-confronting portion formed along a circumferential edge of said top surface and said bottom surface and composed of two slopes respectively tapered symmetrically from said top surface and said bottom surface to an outmost tip of each said blade.
2. The blades of a ceiling fan as claimed in claim 1, wherein said wind-confronting portion is formed along two lengthwise sides of said top surface and said bottom surface.
3. The blades of a ceiling fan as claimed in claim 1, wherein said wind-confronting portion is formed around a circumferential edge of each said blade.
4. The blades of a ceiling fan as claimed in claim 1, wherein said wind-confronting portion is formed along two lengthwise sides of said top surface and said bottom surface and gradually widened toward a side of said blades opposite to that pivotally fixed with said shaft of said motor.
5. The blades of a ceiling fan as claimed in claim 1, wherein said slopes of said wind-confronting portion are formed flat.
6. The blades of a ceiling fan as claimed in claim 1, wherein said slopes of said wind-confronting portion are formed concave.
7. The blades of a ceiling fan as claimed in claim 1, wherein said slopes of said wind-confronting portion are formed convex.
8. The blades of a ceiling fan as claimed in claim 1, wherein said top surface and said bottom surface are decorated with different patterns.
9. The blades of a ceiling fan as claimed in claim 1, wherein a boundary between two said slopes of said wind-confronting portion is formed of a safety arc.
10. The blades of a ceiling fan as claimed in claim 1, wherein a boundary between said wind-confronting portion and said top surface or said bottom surface is correspondingly formed of a safety arc.
Type: Application
Filed: Sep 4, 2008
Publication Date: Mar 4, 2010
Inventor: Ken-Tuan CHEN (Taiping City)
Application Number: 12/204,631
International Classification: F01D 5/14 (20060101);