Patent ID: 6038959
Filing Date: 2000-03-21
Classification: F15B

Abstract:
A cylinder device comprising:a base plate having a fluid passage defined therein;a casing fixedly mounted on said base plate and having a fluid inlet/outlet port defined therein and a through hole defined therein, said fluid inlet/outlet port communicating respectively with said fluid passage;a piston fixed to said base plate;a cylinder reciprocally movably disposed in said through hole, said cylinder defining a plurality of chambers at piston-head and piston-rod ends of said piston;a top plate fixed to said cylinder for displacement in unison with the cylinder;a first branch passage defined in said piston and communicating at one end thereof with said fluid passage, and opening at another end thereof into one of the plurality of chambers at a piston-bead end of said piston;a second branch passage defined in said base plate and communicating at one end thereof with said fluid passage, and opening at another end thereof into another of the plurality of chambers at a piston-rod end of said piston; andthe arrangement being such that when a fluid under pressure is supplied through said fluid inlet/outlet port, through said fluid passage and through said first and second branch passages substantially simultaneously into said plurality of chambers, a fluid pressure buildup is developed simultaneously in said plurality of chambers to displace said cylinder and said top plate with respect to said piston.