| 摘要 |
<p>PROBLEM TO BE SOLVED: To surely prevent fluid from leaking by letting a presser ring be surely contracted in diameter with the presser ring prevented from being rotated together with a fastening nut when the aforesaid nut is fastened, furthermore prevent a connected pipe from being twisted, and thereby prevent the connected pipe from being damaged because of twisting. SOLUTION: A joint main body 1 is provided with a first male screw 2 threadedly engaged with an apparatus (a) at its one end, and with an insertion cylindrical part 4 to be engaged with both a second male screw 7 and the inner side of a connected pipe 3 at the other end. A presser ring 13 is interposed between the joint main body 1 and a firm fastening nut 6 threadedly engaged with the second male screw 7, and the presser ring 13 is contracted in diameter, so that the connected pipe 3 in which the insertion cylindrical part 4 is fitted and inserted, is thereby held therein. Besides, a projected piece 15 is provided for one end at the joint main body 1 side of the presser ring 13, and a cut-out for locking the projected piece 15, is formed in the joint main body 1.</p> |
