Patent ID: 8511343

Claim:
A reservoir tank for a hydraulic system having a hydraulic cylinder and a piston within the hydraulic cylinder, comprising: a hollow body forming a cavity, the hollow body having an interior portion, an exterior portion, and a centroid located within the interior portion; a pick-up tube attached to the hollow body with a portion of the pick-up tube extending into the interior portion of the hollow body, the pick-up tube having a port positioned at the centroid in the interior portion of the hollow body, wherein the hollow body of the reservoir tank is adapted to be filled with a volume of working fluid such that the working fluid continuously submerges the port of the pick-up tube regardless of the orientation of the hollow body of the reservoir tank; and a channel of the pick-up tube extending from the port at the centroid of the hollow body to the exterior portion of the hollow body of the tank such that the working fluid flows through the channel from the interior portion to the exterior portion of the hollow body of the reservoir tank, and wherein the working fluid continuously submerges the port at levels that vary between a maximum point and a minimum point due to volumetric changes of the working fluid in the hollow body resulting from the piston moving in and out at the hydraulic cylinder.