Automatic pumping apparatus utilizing wave motion

An automatic pumping apparatus for pumping water by utilizing wave motion to effectuate a pumping stroke and a return stroke, said apparatus comprising:

• a stationary supporting frame;
• a pumping mechanism provided on the supporting frame and arranged to be actuated by the wave motion;
• and
• a reservoir tank for storing pumped water from the pumping mechanism;
• wherein the pumping mechanism comprises
• at least one sink-and-float member provided on said supporting frame to move up and down in response to the wave motion, each sink-and-float member having a horizontal cross sectional area S.sub.0,
• at least one piston each being coaxially positioned on and connected to the corresponding sink-and-float member via a connecting rod so as to move synchronously therewith during said pumping and return strokes, each piston having a cross sectional area S.sub.1 smaller than the cross sectional area S.sub.0 of the corresponding sink-and-float member,
• at least one cylinder each being supported by the stationary supporting frame to receive the associated piston and having a first end and an open second end communicating with water to be pumped by the associated piston during the pumping stroke,
• at least one pumping pipe connected to a top end of said cylinder and having a height H, and
• at least one check valve to prevent any flow of water back from said reservoir tank toward the cylinder,
• each piston having a piston valve which closes during the pumping stroke and which opens during the return stroke to enable the piston to pass water through the cylinder,
• wherein each sink-and-float member, each piston and each pumping pipe are arranged to satisfy a relation
• S.sub.0 h.sub.0 =S.sub.1 H
• where h.sub.0 is a specified lower limit of a wave height of the wave motion.

An automatic pumping apparatus for pumping water by utilizing wave motion to effectuate a pumping stroke and a return stroke, said apparatus comprising:

• a stationary supporting frame;
• a pumping mechanism provided on the supporting frame and arranged to be actuated by the wave motion;
• and
• a reservoir tank for storing pumped water from the pumping mechanims;
• wherein the pumping mechanism comprises
• at least one sink-and-float member provided on said supporting frame to move up and down in response to the wave motion,
• at least one piston each being positioned on and connected to the corresponding sink-and-float member via a connecting rod so as to move synchronously therewith during pumping and return strokes, each piston having a cross sectional area smaller than that of the corresponding sink-and-float member,
• at least one cylinder each being supported by the stationary supporting frame to receive the associated piston and having a first end and an open second end communicating with water to be pumped by the associated piston during the pumping stroke,
• at least one pumping pipe connected to a top end of said cylinder, and
• at least one check valve to prevent any flow of water back from said reservoir tank toward the cylinder,
• each of the cylinders being positioned beneath and coaxially with the sink-and-float member such that said open second end is positioned above said first end and the piston is located within the cylinder and below the open second end.