Patent ID: 6761103
Filing Date: 2004-07-13
Classification: B23Q

Abstract:
A cylinder assembly comprising:a first working cylinder (20) having an actuation chamber (23), and performing a locking operation when a gas pressure of the actuation chamber (23) has exceeded a first set pressure (P1) and making a releasing operation when the gas pressure of the actuation chamber (23) has decreased to a second set pressure (P2) lower than the first set pressure (P1); a second advancing and retreating cylinder (32) comprising a second cylinder bore (33) which has a first end wall (40) and a second end wall (44), a second piston (35) fitted into the second cylinder bore (33), an inlet chamber (41) formed between the second piston (35) and the first end wall (40), which pressurized gas is supplied to and discharged from, an outlet chamber (45) formed between the second end wall (44) and the second piston (35) and communicating the actuation chamber (23) with the outside air, and a return means (46) which retracts the second piston (35) to the first end wall (40); a flow resistance applying means (K) provided in a route extending from the actuation chamber (23) to the outside air via the outlet chamber (40); and a changeover means (61) communicating the actuation chamber (23) with the outlet chamber (45) during a term from the beginning to the end of an advancing movement of the second piston (35) and communicating the actuation chamber (23) with the inlet chamber (41) at the terminal of the advancing movement of the second piston (35).