Pendulum pump

A pumping device comprising:

• an upright support with a fulcrum at its top;
• a pendulum beam pivotally mounted to the fulcrum for pivoting about a horizontal axis, the beam having a first end and an opposite second end;
• a U-shaped pipe for containing a liquid, the U-shaped pipe having a first upturned end and a second upturned end;
• an overflow pipe connected to the second upturned end for discharging liquid for the second upturned end;
• an overflow tank for receiving liquid from the overflow pipe;
• a return section connected to the overflow tank for receiving and hold liquid, the return section being connect to the U-shaped pipe;
• valve means for separating the return section from the U-shaped pipe;
• a piston slidably mounted in the first upturned end of the U-shaped pipe, the piston being connected to the first end of the pendulum beam for moving up and down with pivoting of the beam;
• a weight at the first end of the beam for helping force the piston down to push liquid up into the second upturned end and to the overflow pipe;
• a pair of pivoting weighted wings at the second end of the beam, the wings having a spread position for exerting reduced weight at the second end of the beam and a parallel extended position for exerting an increased weight at the second end of the beam, the increased weight of the wings thus pushing down on the second end of the beam for pulling the piston up;
• and
• motor means for pivoting the wings between their parallel and spread positions.