| 摘要 |
PROBLEM TO BE SOLVED: To make expansion and contraction of a straw more smooth in a straw which is freely expanded and contacted by forming a bellows-like elastic mechanism. SOLUTION: The straw in which the bellows-like elastic mechanism 2 is provided having the first straw 1 formed to freely expand and contract by the elastic mechanism and the second straw 3 inserted in the bellows-like elastic mechanism 2 of the first straw. The second straw 3 is fixed on the first straw 1 at a position where it does not affect the action of the bellows-like elastic mechanism 2 provided with the straw 1. The second straw 3 has an outer diameter in which the bellows-like elastic mechanism 2 can slide freely along the outer surface.
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