| 摘要 |
The present invention relates to an expandable connecting pipe with enhanced hardness, capable of improving hardness in a longitudinal direction by transforming or removing a part of bellows. The present invention comprises: left and right flanges (100)(110) formed to stay away from each other; bellows (200) placed between the left and right flanges (100)(110) to make changeable a length between the left and right flanges (100)(110); left and right setting logs (120)(130) protruding from the left and right flanges (100)(110) to the outside; and a setting bolt (300) and a setting nut (400) placed between the left and right setting logs (120)(130) to support the setting logs (120)(130) to make the logs stay away from each other. The bellows (200) include: a protruding part (230) protruding to form winkles; and a plane part (240) comprising planes corresponding to the flanges (100,110). Therefore, the present invention is capable of making flexibility and hardness complementary to each other. |
