Shock and Vibration Attenuating Device for Sports Equipment

Abstract

A shock and vibration attenuating device is inserted into or attached to the stroke portion of sports equipment and provided with a chamber carrier and mass particles dispersed in one or more chambers formed into the chamber carrier. The inner surface of the chambers and the mass particles are coated with an electrically conductive material layer to prevent the particles from clinging together or clinging to the inner surface of the chambers, so that the particles are able to move freely within the chambers to attenuate the shock and vibrations of the sports equipment caused by reacting-force during stroke.

What is claimed is: 
     
         1 . A shock and vibration attenuating device for sports equipment being inserted into or attached to a stroke portion of the sports equipment comprising:
 A chamber carrier with two lateral edges, a plurality of holes between the two lateral edges;   a single chamber or one or more rows of chambers alternatively arranged with respect to the holes and located along the two lateral edges in a protruding manner, an inner surface of each of the chambers being coated with a layer of electrically conductive material; and a single or a plurality of mass particles, each of the chambers being partially filled with the mass particles, each of the mass particles being coated with a layer of electrically conductive material, each of the chambers being filled with one or more of the mass particles in such a manner that there is a distance between the electrically conductive mass particles and the inner surface of the chambers, allowing the mass particles to move freely within the chambers to dynamically suppress impact shock during the striking action and dynamically reduce vibration after the impact.   
     
     
         2 . The shock and vibration attenuating device for sports equipment as claimed in  claim 1 , wherein the electrically conductive layer on the inner surface of the respective chambers and the mass particles are coated by electrically conductive materials, such as graphite, metal sputtering or galvanic coating processes. 
     
     
         3 . The shock and vibration attenuating device for sports equipment as claimed in  claim 1 , wherein the travel distance of the mass particles moving within the chambers during the striking action, is calculated based on the following equation 1: 
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 d 
                  
                 
                     
                 
                  
                 m 
               
               - 
               
                 
                   
                     t 
                     c 
                   
                   
                     
                       Δ 
                        
                       
                           
                       
                        
                       
                         V 
                         
                           m 
                            
                           
                               
                           
                         
                       
                     
                   
                 
                 * 
                 COR 
               
             
           
         
         Wherein Δdm represents the travel distance that the mass particles moves, t c  is the dwelling time, ΔV m  is the velocity difference of the sports equipment during the striking action, and COR as the primary impact systems coefficient of restitution. 
       
     
     
         4 . The shock and vibration attenuating device for sports equipment as claimed in  claim 3 , wherein the velocity difference ΔV m  of the sports equipment during the striking action is calculated based on the following equation 2: 
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                   m 
                 
               
               = 
               
                 
                   2 
                   * 
                   
                     m 
                     b 
                   
                   * 
                   
                     V 
                     r 
                   
                 
                 
                   
                     m 
                     b 
                   
                   + 
                   
                     m 
                     r 
                   
                 
               
             
           
         
         wherein m b  is the mass of the ball, m r  is the mass of the sports equipment, and V r  is the velocity of the sports equipment. 
       
     
     
         5 . The shock and vibration attenuating device for sports equipment as claimed in  claim 1 , wherein the sports equipment is a tennis racket, golf club, or bat. 
     
     
         6 . The shock and vibration attenuating device for sports equipment as claimed in  claim 1 , wherein the sports equipment is a ski. 
     
     
         7 . The shock and vibration attenuating device for sports equipment as claimed in  claim 1 , wherein the sports equipment comprises a frame connected to a handle when the sports equipment is a tennis racket, and a string bed provided around an inner periphery of the frame, the racket frame is further provided with a plurality of holes, the chamber carrier comprises a first surface and a second surface which are opposite to each other and connected to the two lateral edges, the chambers are formed on the first surface of the chamber carrier in a protruding manner, the chamber carrier is inserted into the frame of the sports equipment in such a manner that the first and second surfaces are perpendicular to the string bed of the sports equipment, and the holes of the chamber carrier are aligned and connected through the holes of the frame of the sports equipment. 
     
     
         8 . The shock and vibration attenuating device for sports equipment as claimed in  claim 1 , wherein the chambers are arranged in two symmetrical rows along the two lateral edges of the chamber carrier, and around each of the holes of the chamber carrier are arranged four said chambers. 
     
     
         9 . The shock and vibration attenuating device for the sports equipment as claimed in  claim 1 , wherein the chambers are semispherical in cross section. 
     
     
         10 . The shock and vibration attenuating device for the sports equipment as claimed in  claim 1 , wherein the chambers are semicircular, spherical or half spherical in cross section. 
     
     
         11 . A shock and vibration attenuating device for sports equipment being inserted into a stroke portion of the sports equipment comprising: a chamber carrier with two lateral edges, a plurality of chambers arranged along the two lateral edges, and in each of the chambers being disposed one or more mass particles; and the shock and vibration attenuation device being characterized in that:
 an inner surface of each of the chambers is coated with a layer of electrically conductive materials, each of the chambers are provided with one or more mass particles, each of the mass particles is coated with a layer of electrically conductive materials, there is a distance between the mass particles and the inner surface of the chambers, allowing the mass particles to move freely within the chambers to absorb stroke impact caused by a striking action and reduce shocks caused by the stroke impact.   
     
     
         12 . The shock and vibration attenuating device for the sports equipment as claimed in  claim 11 , wherein the travel distance that the mass particles moves within the chambers during the striking action are matched to the respective impact system which is calculated based on the following equation 1: 
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 d 
                  
                 
                     
                 
                  
                 m 
               
               = 
               
                 
                   
                     t 
                     c 
                   
                   
                     
                       Δ 
                        
                       
                           
                       
                        
                       
                         V 
                         
                           m 
                            
                           
                               
                           
                         
                       
                     
                   
                 
                 * 
                 COR 
               
             
           
         
         wherein Δdm represents the travel distance D that the mass particles moves, t c  is the dwelling time, ΔV m  is the velocity difference of the sports equipment during the striking action, and COR is primary impact systems coefficient of restitution. 
       
     
     
         13 . The shock and vibration attenuating device for sports equipment as claimed in  claim 12 , wherein the velocity difference ΔV m  of the sports equipment during the striking action is calculated based on the following equation 2: 
       
         
           
             
               
                 Δ 
                  
                 
                     
                 
                  
                 
                   V 
                   m 
                 
               
               = 
               
                 
                   2 
                   * 
                   
                     m 
                     b 
                   
                   * 
                   
                     V 
                     r 
                   
                 
                 
                   
                     m 
                     b 
                   
                   + 
                   
                     m 
                     r 
                   
                 
               
             
           
         
         wherein m b  is the mass of the ball, m r  is the mass of the sports equipment, and V r  is the velocity of the sports equipment. 
       
     
     
         14 . A shock and vibration attenuating device for sports equipment being inserted into a frame or attached alongside the frame of a tennis racket comprising:
 a chamber carrier with two lateral edges, a plurality of holes between the two lateral edges;   one or more chambers alternatively arranged with respect to the holes and located along the two lateral edges in a protruding manner, an inner surface of each of the chambers being coated with a layer of electrically conductive materials; and   one or more mass particles, each of the mass particles being coated with a layer of electrically conductive materials, each of the chambers being filled with one or more mass particles in such a manner that there is a distance between the mass particles and the inner surface of the chambers, allowing the mass particles to move freely within the chambers to absorb stroke impact caused by a striking action and reduces shocks caused by the stroke impact.   
     
     
         15 . The shock and vibration attenuating device for the sports equipment as claimed in  claim 14 , wherein the tennis racket comprises a frame connected to a handle, and a string bed provided around an inner periphery of the frame, the frame is further provided with a plurality of holes, the chamber carrier is provided with a first surface and a second surface which are opposite to each other and connected to the two lateral edges, the one or more chambers are formed on the first surface of the chamber carrier in a protruding manner, the chamber carrier is inserted into the frame of the tennis racket in such a manner that the first and second surfaces are perpendicular to the string bed of the tennis racket, and the holes of the chamber carrier are aligned and connected through the holes of the frame of the tennis racket.