Patent ID: 6481333
Filing Date: 2002-11-19
Classification: F04B,F15B

Abstract:
A positioning device comprising:a first piston and a second piston in a body, the first piston and the second piston having a same outside diameter, the first piston having a position restricted by the body and a position corresponding to a position of the second piston as stop positions, and the second piston having a position restricted by the body and a position restricted by a second piston restricting part as stop positions; a first pressure chamber for applying a pressure to the second piston in a direction of the first piston; a second pressure chamber for applying a pressure in a direction to separate the first piston and the second piston from each other; a third pressure chamber for applying a pressure to the first piston in a direction of the second piston, a first adjusting mechanism for dynamically adjusting a stop position of the first piston; and a second adjusting mechanism for dynamically adjusting a stop position of the second piston, wherein: a pressure-receiving area of the second piston is made greater than a pressure-receiving area of the first piston to thereby make the pressure of the second piston greater than the pressure of the first piston.