| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact liquid-pressure coupler without reversals of both pistons in a moving direction. SOLUTION: A first piston 3 is formed into a general pot-like shape, and has a notch 4 and an inside bottom area 5. A second piston 6 is arranged in the notch 4 of the first piston 3, and a coupler chamber 7 is arranged between the second piston 6 and the inside bottom area 5 of the first piston 3.
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