| 摘要 |
An object of the present invention is to provide an expandable electric cord not requiring a large force (energy loss) for expansion and contraction, able to carry a large current for driving electric power, and having expandability under a small load and low electrical resistance. The inventive expandable electric cord has a structure at least comprised of a core portion, a conductor portion and a sheath portion; wherein, the core portion is an elastic cylinder comprised of an elastic body and an intermediate layer covering the outer periphery thereof, the conductor portion contains a conductor wire comprised of narrow stranded wires, with the conductor wire being coiled and/or braided around the outer periphery of the elastic cylinder, and the sheath portion is an outer sheath layer comprised of an insulator that covers the outer periphery of the conductor portion.
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