Patent ID: 8910475

Claim:
A buoyancy power generating apparatus comprising: a tank adapted to receive liquid therein; a buoyancy mechanism disposed in said tank and including a bladder support and a bladder supported on said bladder support, said buoyancy mechanism being movable upwardly in said tank by a buoyant force of the liquid when said bladder is inflated and being movable downwardly in said tank by gravity when said bladder is deflated; a vertical support disposed outwardly of said tank; a weight unit supported movably on said vertical support; and a transmission coupled to said buoyancy mechanism and said weight unit so that said weight unit can be driven by said bladder to move upwardly along said vertical support during upward movement of said bladder and that said weight unit can be 20 moved downwardly along said vertical support by gravity when said bladder is deflated; wherein said bladder support includes a collapsible cage surrounding and urging against said bladder so that said collapsible cage can be extended by expansion of said bladder when said bladder is inflated, said collapsible cage providing a resilient contraction force acting on said bladder and being collapsible when said bladder is deflated; and wherein said collapsible cage includes an upper rod support connected to said bladder, a lower rod support connected to said bladder and disposed below said upper rod support, a plurality of upper pivot links pivoted to said upper rod support, a plurality of lower pivot links pivoted to said lower rod support, a plurality of first vertical rods having opposite ends that are connected respectively to a respective one of said upper pivot links and a corresponding one of said lower pivot links, and at least one elastic ring connected to said first vertical rods for urging said first vertical rods to abut against said bladder.