Water ball

Abstract

A water ball with a bubble eliminating device is revealed. A bottom cover is connected to an opening edge on the bottom of a transparent container so as to form a closed container that is filled with a fluid. The bottom cover is disposed with a hole and a sheet with elasticity is placed over the hole to close the hole. The sheet is used to regulate pressure changes of the fluid in the water ball caused by volume changes. Thus the formation of bubbles is prevented and the crack of the enclosed container due to increased fluid pressure is prevented.

1 . A water ball with a bubble eliminating device comprising:
 a transparent container having an opening edge on a bottom thereof;   a bottom cover that is connected to the opening edge on the bottom of the transparent container so as to form a closed container that is filled with a fluid; the bottom cover having a hole on a bottom thereof and at least one sheet with elasticity placed over the hole and pressing against the hole tightly by a positioning part so that the sheet absorbs pressure changes of the fluid in the closed container; and   a base on which the closed container is fixed;   wherein volume of the fluid in the closed container increases or decreases and pressure changes occur when temperature changes; the sheet is used to regulates the pressure changes so as to prevent formation of bubbles and avoid crack caused by increased pressure.   
     
     
         2 . The device as claimed in  claim 1 , wherein the sheet is made from semi-soft material with elasticity. 
     
     
         3 . The device as claimed in  claim 1 , wherein the positioning part is disposed with a locking part on a bottom edge thereof while a locking slot is mounted around the hole of the bottom cover; the locking part of the positioning part is corresponding to and locked with the locking slot of the bottom cover. 
     
     
         4 . The device as claimed in  claim 1 , wherein a flange is disposed on a periphery of the sheet while the bottom cover and the positioning part respectively are arranged with a groove; the flange of the sheet is mounted between the groove of the bottom cover and the groove of the positioning part. 
     
     
         5 . The device as claimed in  claim 1 , wherein the transparent container is a ball-shaped container made from glass by blow molding. 
     
     
         6 . The device as claimed in  claim 1 , wherein the transparent container is a ball-shaped container made from plastic by blow molding or injection blow molding. 
     
     
         7 . The device as claimed in  claim 6 , wherein the transparent container and the bottom cover are connected to and integrated with each other by ultrasonic welding. 
     
     
         8 . The device as claimed in  claim 7 , wherein the bottom cover is disposed with a circular edge that is a step edge having a higher inner step and a lower outer step; the opening edge of the transparent container is connected to the lower outer step of the bottom cover by ultrasonic welding.