| 摘要 |
A manifold (2) is provided with a first passage (4) for supplying pressurized oil and a second passage (5) for air venting. The manifold (2) has a support surface (9) to which a housing (12) of every hydraulic cylinder (7) is hermetically fixed through a sealing member (10). A piston (14) is inserted into a cylinder bore (13) of the housing (12). A hydraulic chamber (15) is formed between the piston (14) and the support surface (9). The hydraulic chamber (15) directly opposes to the support surface (9). The first passage (4) communicates with the respective hydraulic chambers (15) through branched passages (17). The hydraulic chamber (15) has an upper portion communicated with the second passage (5) through an air vent passage (18).
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