Blades of a ceiling fan (2)

Abstract

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 . 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.