Patent ID: 8118569

Claim:
A hydraulic power device, comprising: a first cylinder with a cylindrical chamber; a first fluid inlet, in fluid communication with the cylindrical chamber of the first cylinder to allow a one-way flow of fluid into the cylindrical chamber through the first fluid inlet; a first fluid outlet, in fluid communication with the cylindrical chamber of the first cylinder to allow a one-way flow of fluid out of the cylindrical chamber through the first fluid outlet; and a weight unit, operably moving up and down and having a first piston, the first piston hermetically fitting into the first cylinder and moving upwards and downwards within the first cylinder, wherein, when the weight unit moves down, the first piston moves downwards within the first cylinder, and the fluid in the cylindrical chamber flows out through the first fluid outlet under the pressure from the first piston, thereby a hydraulic power output is generated, when the weight unit moves up, the first piston moves upwards within the first cylinder, and the fluid flows into the cylindrical chamber through the first fluid inlet, to get prepared for subsequent hydraulic power output, wherein the hydraulic power device further comprises: a second cylinder with a cylindrical chamber; a second fluid inlet, in fluid communication with the cylindrical chamber of the second cylinder to allow a one-way flow of fluid into the cylindrical chamber through the second fluid inlet; and a second fluid outlet, in fluid communication with the cylindrical chamber of the second cylinder to allow a one-way flow of fluid out of the cylindrical chamber through the second fluid outlet, wherein, the first piston is located at the bottom of the weight unit, the weight unit is further provided with a second piston on the top thereof, the second piston hermetically fits into the second cylinder and moves downwards and upwards within the second cylinder, wherein, when the weight unit moves up, the second piston moves upwards within the second cylinder, and the fluid in the cylindrical chamber flows out through the second fluid outlet under the pressure from the second piston, thereby a hydraulic power output is generated; when the weight unit moves down, the second piston moves downwards within the second cylinder, and the fluid flows into the cylindrical chamber through the second fluid inlet, to get prepared for subsequent hydraulic power output.