PROBLEM TO BE SOLVED: To provide an endoscope bending tube with few irregularities on the surface.SOLUTION: Adjacent first cylindrical members 140 are connected to each other by engaging two first truncated cone-shaped projections 145 with two first pivot holes 144 in such a way that each first pivot hole 144 is approximately coaxial with each truncated cone-shaped projection 145. The diameter of the first pivot hole 144 on the outer peripheral side is smaller than the diameter on the inner peripheral side, and the diameter of the first truncated cone-shaped projection 145 on the outer peripheral side is larger than the diameter on the inner peripheral side, so that the first truncated cone-shaped projection 145 is not disengaged from the first pivot hole 144. With this structure, each first cylindrical member 140 is attached in such a way as tiltable around the axis of the first pivot hole 144, that is the axis of the first truncated cone-shaped projection 145. Further, as a first flange receiving part 142 is caved in toward the inner peripheral side by the thickness of one first cylindrical member 140, the outer peripheral surface of a first flange part 143 provided on one first cylindrical member 140 is approximately flushed with the outer peripheral surface of the other first cylindrical member 140, so that an approximately uniform cylinder surface is formed over the whole length of a first joint member 113.COPYRIGHT: (C)2013,JPO&INPIT【課題】表面に凹凸が少ない内視鏡湾曲管を得る。【解決手段】隣接する第1の円筒形部材140どうしは、第1の軸支穴144の軸と第1の円錐台突起145の軸とが略同軸となるように、2つの第1の軸支穴144に2つの第1の円錐台突起145を各々係合させて接続される。第1の軸支穴144の径は内周側よりも外周側の方が小さく、第1の円錐台突起145の径は内周側よりも外周側の方が大きい。よって、第1の円錐台突起145が第1の軸支穴144から外れることはない。これにより、第1の円筒形部材140は、第1の軸支穴144の軸、すなわち第1の円錐台突起145の軸回りに傾動自在に取り付けられる。また、第1の鍔部143の厚みだけ第1の鍔受部142が内周側に向けて陥没しているため、一方の第1の円筒形部材140に設けられた第1の鍔部143の外周面と他方の第1の円筒形部材140の外周面とが略面一となり、第1の関節部材113の全長に渡り略均一な円筒表面が形成される。【選択図】図2
