| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a tube connecting device which is improved so that such a malfunction that fluid intrudes into a gap between a tube and an inner ring and stays at the gap may be eliminated even if the tube and the inner ring are slightly inclined and press-inserted. <P>SOLUTION: In the tube connecting device which can connect the tube 4 to a cylindrical screwing part 1A in a sealed state by fastening a tube end 4C which is externally fit to the inner ring 3 with a screw-progressing union nut 2 and expanded in diameter, a diameter-expanded portion 3f of the inner ring 3 in a state that a portion which is expanded in diameter out of the internal periphery of the diameter-expanding tube end 4C is merely expanded in diameter to the maximum is larger than an internal periphery diameter-expanded face 4u which is naturally narrowed toward its tip at the internal periphery of the tube end 4C which appears in the state, and has an external periphery diameter-expanded face 3a which is formed into a protrusively-curved face and narrowed toward its tip. <P>COPYRIGHT: (C)2013,JPO&INPIT |
