Ceiling fan having double-layer blades

Abstract

A ceiling fan has blades spaced apart circumferentially about and extending outward radially from a rotating component of a motor. The blades include upper blades and lower blades. Each lower blade is between and extends below a pair of adjacent upper blades. The motor, when activated, rotates the rotating component, concurrently rotating the upper blades and the lower blades in the same rotational direction. Each of the upper blades leading an adjacent one of the lower blades is configured to generate and direct an air current rearwardly and downwardly therefrom in front of the adjacent one of the lower blades and each of the lower blades trailing an adjacent one of the upper blades is configured to intercept the air current from the adjacent one of the upper blades and accelerate it rearwardly and downwardly therefrom, when the motor is activated.

Having fully described the invention in such clear and concise terms as to enable those skilled in the art to understand and practice the same, the invention claimed is: 
     
         1 . A ceiling fan, comprising:
 a motor including a rotating component;   blades spaced apart circumferentially about and extending outward radially from the rotating component, the blades including upper blades and lower blades, each lower blade between and extending below a pair of adjacent upper blades;   the motor, when activated, rotates the rotating component, concurrently rotating the upper blades and the lower blades in the same direction of rotation;   each of the upper blades leading an adjacent one of the lower blades configured to generate and direct an air current rearwardly and downwardly therefrom in front of the adjacent one of the lower blades and each of the lower blades trailing an adjacent one of the upper blades configured to intercept the air current from the adjacent one of the upper blades and accelerate it rearwardly and downwardly therefrom, when the motor is activated.   
     
     
         2 . The ceiling fan according to  claim 1 , wherein the upper blades are identical. 
     
     
         3 . The ceiling fan according to  claim 1 , wherein the lower blades are identical. 
     
     
         4 . The ceiling fan according to  claim 1 , wherein the upper blades and the lower blades are identical. 
     
     
         5 . The ceiling fan according to  claim 1 , wherein the upper blades and the lower blades define a first casing and a second casing, respectively, surrounding the rotating component. 
     
     
         6 . The ceiling fan according to  claim 1 , wherein the upper blades and the lower blades define a casing surrounding the rotating component. 
     
     
         7 . A ceiling fan, comprising:
 a motor including a rotating component;   blades spaced apart circumferentially about and extending outward radially from the rotating component, the blades including upper blades and lower blades, each lower blade between and extending below a pair of adjacent upper blades;   each of the upper blades having a first leading edge, a first trailing edge, and a first deflecting surface between the first leading edge and the first trailing edge;   each of the lower blades having a second leading edge, a second trailing edge, and a second deflecting surface between the second leading edge and the second trailing edge;   the motor, when activated, rotates the rotating component, concurrently rotating the upper blades and the lower blades in the same direction of rotation leading with the first leading edges of the upper blades and the second leading edges of the lower blades; and   each of the upper blades leading an adjacent one of the lower blades configured to generate and direct, by its first deflecting surface, an air current rearwardly and downwardly from its trailing edge to in front of the adjacent one of the lower blades and each of the lower blades trailing an adjacent one of the upper blades configured to intercept, by its second deflecting surface, the air current from the adjacent one of the upper blades and accelerate it, by its second deflecting surface, rearwardly and downwardly from its trailing edge, when the motor is activated.   
     
     
         8 . The ceiling fan according to  claim 7 , wherein the upper blades are identical. 
     
     
         9 . The ceiling fan according to  claim 7 , wherein the lower blades are identical. 
     
     
         10 . The ceiling fan according to  claim 7 , wherein the upper blades and the lower blades are identical. 
     
     
         11 . The ceiling fan according to  claim 7 , wherein the upper blades and the lower blades define a first casing and a second casing, respectively, surrounding the rotating component. 
     
     
         12 . The ceiling fan according to  claim 7 , wherein the upper blades and the lower blades define a casing surrounding the rotating component.