Blades of a ceiling fan (1)

Abstract

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 . 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.