Patent ID: 7093624
Filing Date: 2006-08-22
Classification: F04B,F04F,Y10T

Abstract:
1. A liquid pumping device, comprising: a barrel; a cylinder mounted in the barrel; a conducting rod movably mounted in the cylinder and having an upper end protruding outward from the barrel, an inside formed with a conducting hole and a lower end provided with a oneway valve to allow fluid in the cylinder to flow upward into the conducting hole only; a piston movably mounted in the cylinder and secured on the lower end of the conducting rod to move therewith, the piston having a peripheral wall formed with a plurality of oneway valves to allow fluid in an upper portion of the cylinder to flow downward into a lower portion of the cylinder only; and an operation lever secured on the upper end of the conducting rod and having an inside formed with an air channel, the air channel of the operation lever having a mediate portion formed with a reduced neck provided with a pressure release valve having an inside formed with a valve hole communicating with the air channel of the operation lever and the conducting hole of the conducting rod.