A bent tube 10 includes joint rings 11 spacedly arranged, side by side, in a row and a connection mechanism 20 which is bridgingly disposed between one of the adjacent joint rings 11 and the other. The connecting mechanism 20 has a pair of hinge members 21, 22 which are rotatably connected around a rivet...http://www.google.se/patents/US20030083550?utm_source=gb-gplus-sharePatent US20030083550 - Bent tube and method for manufacturing the same
