Low noise wrist strength training ball

Abstract

A low noise wrist strength training ball includes a case, a sleeve ring, a rotary body and a magnetic element. The sleeve ring is slidably disposed inside the case and is adapted for sliding relative to the case. The rotary body includes two protruding shafts opposite to each other. The two protruding shafts are pivotally connected to the sleeve ring and are adapted for rotating relative to the sleeve ring. The magnetic element is disposed in the sleeve ring and corresponds to one of the two protruding shafts. The magnetic element is adapted for magnetically attracting the one of the protruding shafts to press against the sleeve ring.

What is claimed is: 
     
         1 . A low noise wrist strength training ball, comprising:
 a case;   a sleeve ring slidably disposed inside the case and adapted for sliding relative to the case;   a rotary body comprising two protruding shafts opposite to each other, the two protruding shafts being pivotally connected to the sleeve ring and adapted for rotating relative to the sleeve ring; and   a magnetic element disposed in the sleeve ring and being corresponding to one of the two protruding shafts, and wherein the magnetic element is adapted for magnetically attracting the one of the protruding shafts to press against the sleeve ring.   
     
     
         2 . The low noise wrist strength training ball according to  claim 1 , wherein the case has an accommodating space and an annular groove, the annular groove is disposed on an inner wall surface of the case forming the accommodating space therein, the rotary body is disposed in the accommodating space, the annular groove surrounds the rotary body, the two protruding shafts are pressed against the annular groove, respectively. 
     
     
         3 . The low noise wrist strength training ball according to  claim 2 , wherein the case comprises a first case portion and a second case portion, the second case portion is installed on the first case portion to form the accommodating space together. 
     
     
         4 . The low noise wrist strength training ball according to  claim 1 , wherein the sleeve ring comprises two pivotal portions opposite to each other, the two protruding shafts are pivotally connected to the two pivotal portions, respectively, for causing the rotary body to rotate relative to the sleeve ring. 
     
     
         5 . The low noise wrist strength training ball according to  claim 4 , further comprising an elastic device, the rotary body having a hollow groove, one side of the elastic device being fixed inside the hollow groove, and the other side of the elastic device being fixed on one of the two pivotal portions of the sleeve ring. 
     
     
         6 . The low noise wrist strength training ball according to  claim 5 , wherein the magnetic element is disposed in the one of the pivotal portions assembled with the elastic device, and the magnetic element is adapted for magnetically attracting the protruding shaft close to the elastic device to press against the one of the pivotal portions close to the elastic device. 
     
     
         7 . The low noise wrist strength training ball according to  claim 6 , wherein each of the two pivotal portions has a through hole, the two protruding shafts penetrate through the two through holes, respectively, the one of the pivotal portions assembled with the elastic device has an accommodating groove, the accommodating groove is close to the through hole of the one of the pivotal portions assembled with the elastic device, the magnetic element is installed in the accommodating groove for magnetically attracting the one of the protruding shafts close to the elastic device to press against an inner wall surface of the corresponding through hole. 
     
     
         8 . A low noise wrist strength training ball, comprising:
 a case;   a sleeve ring slidably disposed inside the case and sliding relative to the case;   a rotary body comprising two protruding shafts opposite to each other, the two protruding shafts being pivotally connected to the sleeve ring and adapted for rotating relative to the sleeve ring; and   a shock damping component disposed on the sleeve ring and being corresponding to one of the two protruding shafts, and the shock damping component being pressed against the one of the protruding shafts.   
     
     
         9 . The low noise wrist strength training ball according to  claim 8 , wherein the sleeve ring comprises two pivotal portions opposite to each other, the two protruding shafts are pivotally connected to the two pivotal portions, respectively, for causing the rotary body to rotate relative to the sleeve ring. 
     
     
         10 . The low noise wrist strength training ball according to  claim 9 , further comprising an elastic device, the rotary body having a hollow groove, one side of the elastic device being fixed inside the hollow groove, and the other side of the elastic device being fixed on one of the two pivotal portions of the sleeve ring. 
     
     
         11 . The low noise wrist strength training ball according to  claim 10 , wherein the one of the pivotal portions assembled with the elastic device has an accommodating groove, the accommodating groove is close to the one of the pivotal portion assembled with the elastic device, the shock damping component is installed in the accommodating groove for the shock damping component to press against the one of the protruding shafts close to the elastic device. 
     
     
         12 . The low noise wrist strength training ball according to  claim 11 , wherein the shock damping component comprises an elastic element and a shock absorbing body, the elastic element and the shock absorbing body are disposed in the accommodating groove, and the shock absorbing body is closer to the protruding shaft than the elastic element normally, and the elastic element causes the shock absorbing body to move toward the one of the protruding shafts for pressing against the one of the protruding shafts close to the elastic device. 
     
     
         13 . A low noise wrist strength training ball, comprising:
 a case comprising a first case portion, a second case portion, a first concave portion and a second concave portion, the first concave portion and the second concave portion being disposed on the circumference of the first case portion and the circumference of the second case portion, respectively, the second case portion being installed on the first case portion for forming an accommodating space together, the first concave portion and the second concave portion forming an annular groove together, the annular groove having a contact surface, each of the first concave portion and the second concave portion having an inner surface and an outer surface opposite to each other, and the contact surface being connected to the inner surfaces;   a sleeve ring slidably disposed inside the annular groove and adapted for sliding relative to the case; and   a rotary body comprising two protruding shafts opposite to each other, the two protruding shafts being pivotally connected to the sleeve ring and adapted for rotating relative to the sleeve ring, the two protruding shafts being respectively attached on the contact surface, and ends of the two protruding shafts being disposed between the inner surfaces and the outer surfaces respectively.