Billiard cue

Abstract

A billiard cue comprises of a shaft portion and a bat portion which is coupled to the shaft portion. Both the shaft portion and/or the bat portion is shaped into a bar body in which a space is formed. The space is formed along a longitude of the bar body and has a cylindrical shape. The space may have a truncated cone shape. In addition, the space may be partially formed in the bar body. Furthermore, the space may have plural cylindrical space sections which are arranged along the longitude of the bar body. The cylindrical space sections have diameters which are different from one another. Bumps are positioned between the cylindrical space sections, respectively. Inasmuch as the shaft portion and/or the bat portion have the spaces, respectively, it is possible to make the billiard cue lighter.

What is claimed is:  
     
         1 . A billiard cue comprising a shaft portion and a bat portion which is coupled to said shaft portion, wherein at least one of said shaft portion and said bat portion is shaped into a bar body in which a space is formed.  
     
     
         2 . A billiard cue comprising of a shaft portion and a bat portion which is coupled to said shaft portion, wherein at least one of said shaft portion and said bat portion is shaped into a bar body in which a cylindrical space is formed along a longitude of said bar body.  
     
     
         3 . A billiard cue comprising of a shaft portion and a bat portion which is coupled to said shaft portion, wherein at least one of said shaft portion and said bat portion is shaped into a bar body in which a truncated cone shaped space is formed along a longitude of said bar body, said truncated cone shaped space extending along the longitude of said bar body.  
     
     
         4 . A billiard cue comprising a shaft portion and a bat portion which is coupled to said shaft portion, wherein at least one of said shaft portion and said .bat portion is shaped into a bar body in which a partial space is formed.  
     
     
         5 . A billiard cue comprising of a shaft portion and a bat portion which is coupled to said shaft portion, wherein: 
 at least one of said shaft portion and said bat portion is shaped into a bar body in which a cylindrical space is formed along a longitude of said bar body;    said cylindrical space having plural cylindrical space sections which are arranged along the longitude of said bar body, said cylindrical space sections having diameters which are different from one another; and    bumps being positioned between said cylindrical space sections, respectively.    
     
     
         6 . A billiard cue comprising of a shaft portion and a bat portion which is coupled to said shaft portion, wherein: 
 at least one of said shaft portion and said bat portion is shaped into a bar body comprising a multilayer structure having plural material portions which are integrated towards a direction perpendicular to a longitude of said bar body; and    a space being formed in at least one of said shaft portion and said bat portion in correspondence to said multilayer structure along the longitude of said bar body.    
     
     
         7 . A billiard cue comprising of a shaft portion and a bat portion which is coupled to said shaft portion, wherein: 
 at least one of said shaft portion and said bat portion is shaped into a bar body having a multilayer structure having plural material portions which are integrated towards a direction perpendicular to a longitude of said bar body;    at least one partial space being partially formed in at least one of said shaft portion and said bat portion in correspondence to said multilayer structure along the longitude of said bar body; and    a remaining section except said multilayer structure having a material similar to a lower material portion of said multilayer structure.    
     
     
         8 . A billiard cue comprising of a shaft portion and a bat portion which is coupled to said shaft portion, wherein: 
 at least one of said shaft portion and said bat portion is shaped into a bar body having a multilayer structure having plural material portions which are integrated towards a direction perpendicular to a longitude of said bar body;    at least one partial space being partially formed in at least one of said shaft portion and said bat portion in correspondence to said multilayer structure along the longitude of said bar body; and    a remaining section except said multilayer structure having a material similar to an upper material portion of said multilayer structure.