BigPatents India

A booster-type gas compressor comprises a compressed-gas flow path, a cylinder, and a piston that moves up and down in the cylinder to further compress a compressed gas fed into the cylinder from the compressed-gas flow path. In a crank case, a crank shaft is rotated with a driving shaft to move the piston up and down. The compressed-gas flow path is connected to the crank case via a bypath conduit to make pressure difference above and under the piston reduced.