Blade for ceiling fans

Abstract

A blade for ceiling fan consists of a frame and a blade body. The frame is made by plastic injection forming process or metal die casting, and includes two half sections to form a male element and a female element. The frame has a blade body holding means and an anchoring means to hold and anchor the blade body securely on the frame. The frame has a greater thickness than the blade body.

What is claimed is:  
     
         1 . A blade for ceiling fans, comprising: 
 a frame including two half sections, one half section forming a male element and another half section forming a female element for coupling together to form the frame, the frame being hollow and formed substantially in an annular shape with one end having a larger solid section serving as an anchoring end to fasten to a ceiling fan bracket;    a blade body having a shape substantially matching the frame but having a smaller size than the frame;    a blade body holding means selectively located on the male element or the female element for holding the blade body before assembling of the male element and the female element and facilitating the assembling thereafter; and    an anchoring means located respectively on the male element and the female element for fastening the blade body to a middle portion of the frame during the assembling.    
     
     
         2 . The blade for ceiling fans of  claim 1 , wherein the blade body holding means includes a plurality of vertical pins extending from an inner wall of the male element in an equally spaced fashion, and a plurality of vertical wedge hollow struts extending from an inner wall of the female element in an equally spaced fashion, and the pins and the wedge hollow struts being corresponding to a plurality of anchoring holes formed on the peripheral rim of the blade body.  
     
     
         3 . The blade for ceiling fans of  claim 1  further having a blade body tightening means located between the frame and the blade body for stretching the blade body evenly to form a smooth surface when the peripheral rim of the blade body is clamped and fastened between the male element and the female element.  
     
     
         4 . The blade for ceiling fans of  claim 1 , wherein the anchoring means includes a plurality of vertical wedge hollow struts extending from an inner wall of the female element in an equally spaced fashion, a plurality of equally spaced wedge bores running through the male element corresponding to the wedge hollow struts and a plurality of tap screws running through the wedge bores to engage with the wedge hollow struts for fastening the male element to the female element.  
     
     
         5 . The blade for ceiling fans of  claim 1 , wherein the anchoring means includes a plurality of vertical wedge hollow struts extending from an inner wall of the female element in an equally spaced fashion, a plurality of pins extending from an inner wall of the male element in an equally spaced fashion corresponding to the wedge hollow struts, each of the pins having a slit and an outer diameter greater than the inner diameter of the wedge hollow strut such that the pins are inserted into and engaged and with the wedge hollow struts when the male element and the female element are coupled together.  
     
     
         6 . The blade for ceiling fans of  claim 3 , wherein the blade body tightening means includes an annular jutting flange and an annular indented shoulder formed on the peripheral rim of the male element, and an annular shoulder rim and an annular jutting rib formed on the peripheral rim of the female element matching complementarily and geometrically the annular jutting flange and the annular indented shoulder of the male element to clip and stretch the blade body in radial directions.  
     
     
         7 . The blade for ceiling fans of  claim 3 , wherein the blade body tightening means includes an annular wedge jutting ridge extending from an inner wall of the male element towards the female element, and an annular wedge trough extending from an inner wall of the female element towards the male element for coupling with the wedge jutting ridge of the male element.  
     
     
         8 . The blade for ceiling fans of  claim 3 , wherein the blade body tightening means includes at least one annular jutting ridge extending respectively from an inner wall of the male element and from the inner wall of the female element towards each other in a staggered manner to form a firm latching condition.  
     
     
         9 . The blade for ceiling fans of  claim 2 , wherein the female element has at least one annular vertical jutting ridge located between the hollow struts and an inner peripheral rim thereof, and the male element has an annular indented ditch formed on an inner peripheral rim thereof corresponding to the annular jutting ridge such that after the anchoring holes on the peripheral rim of the blade body being coupled with hollow struts of the female element, the male element and the female element being allowed to couple together and to clip the peripheral rim of the blade body between the annular jutting ridge and the annular indented ditch to fasten and stretch the blade body to form a tight tension on the surface of the blade body.  
     
     
         10 . The blade for ceiling fans of  claim 9 , wherein at least one annular indented ditch is formed on the female element and at least one annular jutting ridge is formed on the male element.  
     
     
         11 . The blade for ceiling fans of  claim 1 , wherein the anchoring means further includes a plurality of bulged spots formed on an inner peripheral rim and a plurality of jutting stubs formed on an outer rim of the male element, and a plurality of cavities formed on an inner peripheral rim and a plurality of first notches formed on an outer rim of the female element corresponding respectively to the bulged spots and the jutting stubs, and the blade body having round apertures and second notches formed on the peripheral rim thereof corresponding respectively to the bulged spots and the jutting stubs of the male element such that the bulged spots and the jutting stubs of the male element being allowed to run through the round apertures and the second notches to couple with the cavities and the first notches of the female element, and after the pins of the male element being inserted into the wedge hollow struts of the female element, the coupled bulged spots and the cavities, and the coupled jutting stubs and the first notches being hot melted together by means of a supersonic means.  
     
     
         12 . The blade for ceiling fans of  claim 11 , wherein the hot melted is done by a high frequency means.  
     
     
         13 . The blade for ceiling fans of  claim 2 , wherein the pins of the male element are coupled with the corresponding wedge hollow struts of the female element, and the coupled pins and wedge hollow struts being hot melted together by a supersonic means.  
     
     
         14 . The blade for ceiling fans of  claim 2 , wherein the pins of the male element are coupled with the corresponding wedge hollow struts of the female element, and the coupled pins and wedge hollow struts being hot melted together by a high frequency means.  
     
     
         15 . The blade for ceiling fans of  claim 11 , wherein the male element and the female element are coupled through peripheral rims thereof, and the coupled peripheral rims being hot melted together by a supersonic means.  
     
     
         16 . The for ceiling fans of  claim 11 , wherein the male element and the female element are coupled through peripheral rims thereof, and the coupled peripheral rims being hot melted together by a high frequency means.  
     
     
         17 . The blade for ceiling fans of  claim 1 , wherein the frame is fastened to the ceiling fan bracket through an aperture formed in the frame, the aperture being formed by a hollow pin located on the male element coupling with a hollow strut located on the female element.  
     
     
         18 . The blade for ceiling fans of  claim 1 , wherein the blade body is selectively formed by plastic injection forming process or metal die casting.  
     
     
         19 . The blade for ceiling fans of  claim 1 , wherein the blade body is made from a material selecting from the group consisting of plastic sheets, leather, paper, thin metals or fabrics.