| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a conventional buffering cylinder unit is poor in durability and lacks in reliability since a piston has an elastically-deformable valve. SOLUTION: A buffering cylinder unit comprises a piston member 12 in which the piston 7 is integrated with a piston rod 10 and a circulation passage 16 is formed to connect a first fluid chamber 4 and a second fluid chamber 6 and the piston is movably arranged in a cylinder 2, and a movable member 20 which is movably arranged in the cylinder 2 and movable between an open position brought into contact with a stopper 10a of the piston rod and a blocked position brought into contact with a piston member 12 and has a flow passage 26 for connecting the first fluid chamber 4 and the second fluid chamber 6 via the circulation passage 16 of the piston member 12 in a state of taking an open position. When the piston member 12 moves toward the movable member 20, a gap between the flow passage 26 of the movable member 20 and the circulation passage 16 of the piston member 12 is blocked so that the movable member 20 receiving the flow resistance of a viscous fluid is stuck on the piston member 12. COPYRIGHT: (C)2008,JPO&INPIT
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