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A jack chain is a type of chain made of thin wire, with figure-eight-shaped links, and loops at right angles to each other. Jack chains are often used to suspend fixtures such as lights or signs, for decorative purposes, or as part of a cable lock. Jack chain may be manufactured as either single-jack chain or as double-jack chain. If double-jack, the lower loop is formed of two strands of wire rather than just one as in a single-jack. Before the days of lavatory cisterns being close to the pan, jack chains were often used to release the cistern plug. == Other meanings of "jack chain" == A jack chain is a tool attached to a toothed chain for moving logs. A jack chain is a form of arm protection for the 15th century infantry soldier who typically was not dressed in plate armor but wore a padded arming jacket (“jack”) to protect his upper body. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「jack chain」の詳細全文を読む スポンサード リンク
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