BLADES OF A CEILING FAN (2)
The blades of a ceiling fan are respectively provided with a top surface, a bottom surface, a front wind-confronting portion and a rear wind-confronting portion respectively formed along an edge of two sides of the top surface and the bottom surface. The front wind-confronting portion and the rear wind-confronting portion wind-confronting portion are respectively formed of a slope having the same inclined direction. 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 front wind-confronting portion or the rear 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 front wind-confronting portion and a rear wind-confronting portion that are respectively formed along two sides of the blades so as to lower air drag for promoting power efficiency, with a top surface and a bottom surface interchangeable.
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 interchange their top surface and bottom surface by overturning the blades without downgrading power efficiency.
Each of the blades is respectively provided with a top surface, a bottom surface, a front wind-confronting portion and a rear wind-confronting portion respectively formed obliquely along an edge of two sides of the top surface and the bottom surface. The front wind-confronting portion and the rear wind-confronting portion wind-confronting portion are respectively formed of a slope having the same inclined direction. 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 front wind-confronting portion or the rear 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 invention has the following advantages as can be seen from the foresaid description.
1. With the front wind-confronting portion 23 formed on the top surface 21 and the rear wind-confronting portion 24 formed on the bottom surface 22, air drag can be minimized to promote efficiency of the ceiling fan.
2. With the different patterns attached on the top surface 21 and the bottom surface 22 of the blades 20, 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 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 front wind-confronting portion formed obliquely along a front and a rear side of said top surface, a rear wind-confronting portion formed obliquely along a front and a rear side of said bottom surface, said front wind-confronting portion and said rear wind-confronting portion being shaped as a slope with a same inclined direction.
2. The blades of a ceiling fan as claimed in claim 1, wherein said front wind-confronting portion and said rear wind-confronting portion are respectively 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 front wind-confronting portion and said rear wind-confronting portion are respectively formed along two lengthwise sides of said top surface and said bottom surface, gradually widened toward a short side of said blades opposite to that pivotally fixed with a shaft of a motor.
4. The blades of a ceiling fan as claimed in claim 1, wherein said slopes of said front wind-confronting portion and said rear wind-confronting portion are shaped the same.
5. The blades of a ceiling fan as claimed in claim 1, wherein said slopes of said front wind-confronting portion and said rear wind-confronting portion are formed flat.
6. The blades of a ceiling fan as claimed in claim 1, wherein said slopes of said front wind-confronting portion and said rear wind-confronting portion are formed concave.
7. The blades of a ceiling fan as claimed in claim 1, wherein said slopes of said front wind-confronting portion and said rear 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 safety arc 25 is formed at a boundary between said top surface and said front wind-confronting portion, and between said bottom surface and said rear wind-confronting portion respectively.
Type: Application
Filed: Sep 4, 2008
Publication Date: Mar 4, 2010
Inventor: Ken-Tuan CHEN (Taiping City)
Application Number: 12/204,653
International Classification: F01D 5/14 (20060101);