Composite shaft

Abstract

A composite shaft has sheets rolled. A number of the sheets is three or multiple of three. Widths of the sheets are substantially identical to a length of a circumference of the shaft. Each of the rolled sheets has an overlapped rib distributed on the circumference of the shaft, and central angles between two of the neighboring ribs are substantially identical. The shaft of the present invention has a well mechanical strength and balance.

1 . A composite shaft having sheets rolled, which a number of the sheets is three or multiple of three, wherein widths of the sheets are substantially identical to a length of a circumference of the shaft, and each of the rolled sheets has an overlapped rib distributed on the circumference of the shaft, and central angles between two of the neighboring ribs are substantially identical.  
   
   
       2 . The method of making a composite shaft, comprising the steps of: 
 1) making composite sheets for rolling, wherein widths of the sheets are substantially identical to a length of a circumference of the shaft;    2) rolling the sheets on a rod in sequence, wherein a number of the sheets is three or multiple of three, and each of the rolled sheets has an overlapped rib distributed on the circumference of the shaft, and central angles between two of the neighboring ribs are substantially identical;    3) heating the sheets with the rod for curing, and    4) removing the rod from the sheets to have the shaft.    
   
   
       3 . The method as defined in  claim 2 , wherein the rod has a scale or a mark at an end or at two opposite ends.