Underwater play ball

Abstract

The underwater play ball is comprised of a hollow cavity with a spherical shape which is made of a strong flexible lightweight low density PVC material for holding both water and air pressure without rupturing. The cavity size and dry weight can vary, but the preferred cavity size equals the size of a average soccer ball where the dry weight is easily handled by children. The cavity is inflated with a safe rubber nozzle attachable to any size hose. The cavity includes a predetermined transparent level mark arranged around two valves at one end of the cavity. The water volume and air pressure inside the cavity is adjusted by filling water through a valve while releasing ambient air simultaneously through a second valve until the water volume and air pressure reaches a predetermined transparent fill level mark. The arrangement of a strong flexible lightweight low density PVC cavity combined with a predetermined amount of water and air pressure provides a underwater play ball with both weightless and pneumatic characteristics under water. Such an arrangement, provides a underwater play ball that can naturally glide under the waters surface in a straight line when passed by a swimmer by its self and repeatedly rebound on impact to its original position by itself when passed or bounced for amusement and exercise.

1 . A underwater play ball having both neutral buoyant and pneumatic characteristics under water for amusement and exercise, said underwater play ball comprising:
 a spherical shaped hollow cavity having a volume,   said cavity comprised of a strong flexible lightweight low density PVC material,   at least a first opening in the cavity including a valve for allowing water to enter the cavity to adjust the buoyancy thereof,   at least a second opening in the cavity including a valve for releasing ambient air simultaneously to adjust the air pressure for pneumatic characteristics thereof,   at least one transparent fill level mark on the cavity to show the level of water and air volume   
     
     
         2 . The underwater play ball of  claim 1 , said valves arranged adjacently at one end of the said cavity. 
     
     
         3 . The underwater play ball of  claim 1 , further including a said transparent fill level mark arranged around said valves for showing water level and air volume as a bubble inside the said cavity. 
     
     
         4 . The underwater play ball of  claim 1 , wherein, the buoyancy and air pressure of said cavity is adjusted by filling water through a said valve, while releasing ambient air from a second said valve, simultaneously until the said cavity is inflated with water and air pressure to a predetermined said transparent fill level mark. 
     
     
         5 . The underwater play ball of  claim 1 , further providing a said strong flexible lightweight low density PVC cavity inflated with a predetermined amount of water and air pressure to provide a said neutral buoyant and pneumatic underwater play ball that can glide naturally in a straight line and repeatedly rebound on impact to its original position by itself when passed or bounced by a swimmer for amusement and exercise.