Exercise machine using ball

Abstract

Disclosed herein is an exercise machine using a ball. The exercise machine includes a stand. A fastening bracket is secured to the stand and has on an upper portion thereof a first external threaded part. A coil spring engages at a lower portion thereof with the first external threaded part. A connecting bracket includes a second external threaded part which is provided on a lower portion thereof and engages with an upper portion of the coil spring, and a third external threaded part which is provided on an upper portion thereof. A ball includes a core and a cover formed of a plurality of panel segments. An internal bracket is secured to an inner circumferential surface of the core, and has a first internal threaded part which engages with the third external threaded part.

1 . An exercise machine using a ball, comprising:
 a stand;   a fastening bracket secured to the stand, and having on an upper portion thereof a first external threaded part;   a coil spring engaging at a lower portion thereof with the first external threaded part;   a connecting bracket including:   a second external threaded part provided on a lower portion thereof, and engaging with an upper portion of the coil spring; and
 a third external threaded part provided on an upper portion thereof; 
   a ball including:   a core; and
 a cover formed of a plurality of panel segments; and 
   an internal bracket secured to an inner circumferential surface of the core, and having a first internal threaded part which engages with the third external threaded part.   
     
     
         2 . The exercise machine as set forth in  claim 1 , wherein an air inlet is formed in a central portion of the internal bracket. 
     
     
         3 . The exercise machine as set forth in  claim 1 , wherein the connecting bracket comprises a support plate corresponding to an outer circumferential surface of the ball. 
     
     
         4 . The exercise machine as set forth in  claim 3 , wherein a protrusion is provided on an upper surface of the support plate, and is inserted into a depression which is formed in the associated panel segment of the ball. 
     
     
         5 . The exercise machine as set forth in  claim 1 , wherein the stand comprises:
 an inlet formed in an upper surface thereof and communicating with an empty space therein; and   a second internal threaded part formed in the inlet and engaging with a fourth external threaded part which is provided on a lower portion of the fastening bracket.