Patent ID: 6454542
Filing Date: 2002-09-24
Classification: F04B

Abstract:
A pump system comprising:a first driving cylinder assembly having a first driving piston therein and a piston rod connected to the first driving piston; a first driven cylinder assembly having a piston rod connected to the piston rod of the first driving cylinder assembly and driven thereby; a second driving cylinder assembly having a second driving piston therein and a piston rod connected to the second driving piston; a second driven cylinder assembly having a piston rod connected to the piston rod of the second driving cylinder assembly and driven thereby; a source of pressurized hydraulic fluid supply to said first and second driving cylinder assemblies, to drive the said pistons therein; a first switchable valve coupled between said source and said first driving cylinder assembly and operable, when switched, to reverse the direction that said first driving piston is driven; and a second switchable valve coupled between said source and said second driving cylinder assembly and operable, when switched, to reverse the direction that second driving piston is driven; and the piston rods of all four cylinder assemblies are in parallel, spaced relation to each other.