Abstract: A pneumatic cylinder device having a decleration mechanism. The pneumatic cylinder device has a pneumatic cylinder including a cylinder accomodating a piston movable in the cylinder in response to supply and discharge of compressed air and having a connected piston rod. The pneumatic cylinder further includes a position detector such as a combination of proximity switches and a magnet carried by the piston designed for producing a deceleration signal and a stopping signal when the piston rod has reached a predetermined deceleration starting position and a designated stopping position, respectively. A brake which is connected to the pneumatic cylinder is adapted for stopping the movement of the piston rod in response to the stopping signal produced by the position detector. The pneumatic cylinder device further comprises a deceleration stage connected to the brake and adapted for decelerating the piston rod in response to the deceleration signal produced by the position detector.

Abstract: A pneumatic cylinder device with a locking mechanism has a pneumatic cylinder constituted by a cylinder, a piston slidably received in the cylinder and a piston rod extended from the piston outwardly of the cylinder, and a locking mechanism connected to the pneumatic cylinder and adapted to selectively lock the piston rod against movement. The locking mechanism comprises a housing through which the piston rod is slidably extended; a flexible tubular member disposed in the housing so as to surround the piston rod, the flexible tubular member being contractable and expandable radially; and annular pressure chamber formed around the flexible tubular member and having a variable volume; a volume changing means for causing a change in the volume of the pressure chamber; and a pressure transmission medium accommodated in the pressure chamber and adapted to transmit a pressure change, produced in the pressure chamber as a result of a volume change, to the flexible tubular member.