Patent Number: 6,308,613

Title: Fluid pressure cylinder having lock mechanism

Abstract: A fluid pressure cylinder has a lock mechanism in which its entire structure is simple. Also, its assembling operation and maintenance are easy. The lock mechanism to be assembled to a body of a cylinder includes a fulcrum pin for immovably supporting a lock plate in its axial direction. A spring biases the lock plate in its tilting direction around the fulcrum pin. A returning pressure chamber is provided on the side in which the lock plate is tilted by the biasing spring and applies a fluid pressure to the lock plate against a force of the biasing spring by supplying a pressurized fluid. A sleeve is fitted over a piston rod of the cylinder for forming an inner peripheral wall of the returning pressure chamber. A pressure receiving member for air-tightly sealing a space between the lock plate and an outer peripheral surface of the sleeve and between the lock plate and an inner peripheral surface of the returning pressure chamber is mounted to the lock plate closer to the returning pressure chamber.

Inventors: Takahashi; Hidehito (Ibaraki, JP)

Assignee: SMC Corporation

International Classification: F15B 15/26 (20060101); F15B 15/00 (20060101); F15B 015/26 ()

Expiration Date: 10/30/2018