Patent ID: 7918154

Claim:
A pressure booster having a supply port for supplying a pressure fluid, an outlet port through which a pressure fluid that has been increased in pressure is output, and a discharge port for discharging exhausted pressure fluid, wherein by a reciprocating movement of a pair of pistons that are connected to a piston rod and disposed respectively for displacement inside a pair of cylinder tubes, the pressure fluid that is introduced from said supply port is increased in pressure and output from said outlet port, comprising: a cylinder mechanism having a pair of cylinder tubes equipped with cylinder chambers to which pressure fluid is supplied, a pair of pistons disposed for displacement inside said cylinder tubes, and a piston rod connected to both of said pair of pistons; a center unit disposed between said cylinder tubes and having a switching section therein for switching a state of communication of the pressure fluid between said supply port and said outlet port and said cylinder chambers; and an offset absorbing mechanism disposed between said pistons and said piston rod, which is capable of absorbing an offset occurring between axial centers of said pistons and an axial center of said piston rod, wherein said offset absorbing mechanism includes a swinging member disposed between said pistons and said piston rod, said swinging member being swingably displaceable with respect to said pistons accompanying offset of said piston rod.