| 摘要 |
PROBLEM TO BE SOLVED: To restrain an increase in a rotation resistance of a sprocket without needing a curved chain in a fork device, in which a chain member is wound around a sliding table. SOLUTION: A chain member has a first chain constituting one end of the chain member, a second chain constituting the other end of the chain and displaced parallel with the first chain, and a connection part connecting the first and second chains except the area where the first and second chains are crossed with each other. At least one of sprockets has a first tooth 60 which can be fitted with the first chain, and a second tooth 70 which can be fitted with the second chain. COPYRIGHT: (C)2011,JPO&INPIT
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