公开(公告)号：US20220390052A1

公开(公告)日：2022-12-08

申请号：US17776863

申请日：2020-09-23

申请人： NIPPON PILLAR PACKING CO., LTD.

发明人： Tomoyuki KOIKE ,  Tomohiro ADACHI ,  Yuto TSUCHIYA

IPC分类号： F16L33/22 ,  F16L33/00 ,  F16L33/28

摘要： A fitting body includes a tubular end whose outer periphery has an external thread and whose inner periphery has an annular groove or protrusion. A sleeve connects a tube to the tubular end of the fitting body. A union nut includes a first axial end that receives the tube therein and a second axial end to be screwed onto the external thread of the fitting body. The fitting body includes first and second regulating portions extending in directions that intersect an axial direction of the fitting body to contact the union nut being screwed onto the external thread and then sharply raise torque to be transmitted through the union nut to a hand of a worker. When being screwed onto the external thread, the union nut contacts the first regulating portion and subsequently the second regulating portion.