| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a resin pipe joint which is improved to be superior in assembling workability and handling property by ensuring the check of the fastening of a union nut to be finished or almost finished at a working site under noisy conditions. <P>SOLUTION: In the resin pipe joint, as the threading of a union nut 2 is progressed with a female screw 8 and a male screw 5 threaded to each other in the state that a tube 3 is externally fitted to an inner cylinder 4 to produce an enlarged-diameter part 3A, an enlarged-diameter change region 9 is thrust with a sealing thrust part 10. A regular-hexagon polygonal outer peripheral part 18 is formed on the outer peripheral flange 1A and a comb-like ring 19 is formed at the end of the union nut 2. The inner diameter (r) of each comb tooth 24 is set to a value smaller than the diameter (k) of the angle portion 18a of the polygonal outer peripheral part 18 and not smaller than the smallest diameter (t) of a side portion 18h. A fastening finish recognizing means C is provided to which a great torque fluctuation is transmitted with the comb-like ring part 19 externally fitted to the polygonal outer peripheral part 18 in the state of finishing the threading of the union nut 2 such that the sealing thrust part 10 thrusts the enlarged-diameter change region 9 to form a seal part S. <P>COPYRIGHT: (C)2011,JPO&INPIT |
