Patent ID: 8134245

Claim:
A device for generating substantially vertically-reciprocating motion when in a substantially liquid-loaded posture, comprising: a first and a second chamber; a first and a second buoyant element; and a gaseous-material conduit open to said first chamber; said first buoyant element being disposed within said first chamber and being comprised of a first buoyant member and a first downwardly extending piston member affixed to said first buoyant member, said second buoyant element being disposed within said second chamber and being comprised of a second buoyant member and a second downwardly extending piston member affixed to said second buoyant member, said first chamber being open to fluid flow below said first buoyant member and being open to fluid flow above said first buoyant member through a first valve having a first fluid-release point, said second chamber being disposed vertically above said first chamber, being open to fluid flow below said second buoyant member and being open to fluid flow above said second buoyant member through a second valve having a second fluid-release point.