| 摘要 |
PROBLEM TO BE SOLVED: To provide a curved tube capable of facilitating a caulking work necessary to couple articular rings. SOLUTION: The curved tube 10 comprises the articular rings 11 aligned in one row in space between the rings 11, and a coupling mechanism 20 bridging from one to the other of the adjacent articular rings 11. The mechanism 20 has a pair of hinge members 21, 22 rotatably coupled around a rivet 23 (rotary shaft). The member 21 is fixed to the groove 11c (a part to be engaged with the hinge) of one articular ring 11 by brazing, and the member 22 is fixed to the groove 11c of the other articular ring 11 by brazing.
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