Swing-and-hit device for ball games

Abstract

A swing-and-hit device for ball games includes a handle portion, a barrel portion having a predetermined length for swinging and hitting a ball or the like, and a substance having a property of dynamic moment of inertia being disposed in the swing-and-hit device close to the handle portion. The substance is located close to the handle portion when the swing-and-hit device is normally raised before being swung to hit a ball or the like, and moves toward an impact spot on the barrel portion due to the dynamic moment of inertia when the device is swung to hit the ball or the like. The swing-and-hit device for ball games loaded with the substance having the property of dynamic moment of inertia enables faster swing velocity, reduced muscle-exerted strength, increased effective impact energy, and better cushion effect to avoid possible sport-caused injury due to vibration of the swing-and-hit device after impact.

What is claimed is:  
     
         1 . A swing-and-hit device for ball games comprising a handle portion at where a user grips to swing said swing-and-hit device, a barrel portion having a predetermined length for hitting a ball or the like when the user swings said swing-and-hit device, and a substance having a property of dynamic moment of inertia being disposed in said swing-and-hit device close to said handle portion; whereby said substance is located close to said handle portion when said swing-and-hit device is normally raised before being swung to hit a ball or the like, and moves toward an impact spot on said barrel portion due to said dynamic moment of inertia when said swing-and-hit device is swung to hit the ball or the like.  
     
     
         2 . The swing-and-hit device for ball games as claimed in  claim 1 , wherein said substance having said property of dynamic moment of inertia comprises a plurality of tiny weighting granules.  
     
     
         3 . The swing-and-hit device for ball games as claimed in  claim 2 , wherein said tiny weighting granules are metal granules having specified grain diameters.  
     
     
         4 . The swing-and-hit device for ball games as claimed in  claim 1 , wherein said substance having said property of dynamic moment of inertia comprises a liquid.  
     
     
         5 . The swing-and-hit device for ball games as claimed in  claim 1 , wherein said swing-and-hit device is internally provided with an elongate hole having a predetermined length for holding said substance having said property of dynamic moment of inertia therein.  
     
     
         6 . The swing-and-hit device for ball games as claimed in  claim 2 , wherein said swing-and-hit device is internally provided with an elongate hole having a predetermined length for holding said substance having said property of dynamic moment of inertia therein.  
     
     
         7 . The swing-and-hit device for ball games as claimed in  claim 3 , wherein said swing-and-hit device is internally provided with an elongate hole having a predetermined length for holding said substance having said property of dynamic moment of inertia therein.  
     
     
         8 . The swing-and-hit device for ball games as claimed in  claim 5 , wherein said elongate hole has a distal end located within a best impact spot (sweet spot) on said barrel portion of said swing-and-hit device.  
     
     
         9 . The swing-and-hit device for ball games as claimed in  claim 6 , wherein said elongate hole has a distal end located within a best impact spot (sweet spot) on said barrel portion of said swing-and-hit device.  
     
     
         10 . The swing-and-hit device for ball games as claimed in  claim 7 , wherein said elongate hole has a distal end located within a best impact spot (sweet spot) on said barrel portion of said swing-and-hit device.  
     
     
         11 . The swing-and-hit device for ball games as claimed in  claim 1 , wherein said swing-and-hit device is molded from a metal material to seal said substance having said property of dynamic moment of inertia therein.  
     
     
         12 . The swing-and-hit device for ball games as claimed in  claim 1 , wherein said swing-and-hit device is molded from a composite material and is internally filled with said substance having said property of dynamic moment of inertia.  
     
     
         13 . The swing-and-hit device for ball games as claimed in  claim 1 , wherein said swing-and-hit device is provided near an end with a screw cap to enable adjustment of amount and weight of said substance in said swing-and-hit device via said screw cap.