US 12,031,649 B2
Disengagement prevention structure for pipe connecting portion
Mitsuhiro Mori, Osaka (JP); Daisuke Sakai, Osaka (JP); Yoshihiro Kumaki, Kobe (JP); and Masanori Iga, Kobe (JP)
Assigned to WATERWORKS TECHNOLOGY DEVELOPMENT ORGANIZATION CO., LTD., Osaka (JP); and CITY OF KOBE, Kobe (JP)
Appl. No. 17/601,789
Filed by WATERWORKS TECHNOLOGY DEVELOPMENT ORGANIZATION CO., LTD., Osaka (JP); and CITY OF KOBE, Kobe (JP)
PCT Filed Jun. 20, 2019, PCT No. PCT/JP2019/024476
§ 371(c)(1), (2) Date Oct. 6, 2021,
PCT Pub. No. WO2020/255325, PCT Pub. Date Dec. 24, 2020.
Prior Publication US 2022/0205568 A1, Jun. 30, 2022
Int. Cl. F16L 27/12 (2006.01); F16L 21/04 (2006.01); F16L 21/06 (2006.01); F16L 57/00 (2006.01)
CPC F16L 27/12 (2013.01) [F16L 21/04 (2013.01); F16L 21/065 (2013.01); F16L 27/12751 (2019.08); F16L 57/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A disengagement prevention structure for a pipe connecting portion, comprising:
a collar having a divided structure and surrounding a fitting connection part between a spigot portion of a first pipe portion on one side and a socket portion of a second pipe portion on the other side in a sealed state, the collar being externally mounted over both the spigot portion of the first pipe portion and the socket portion of the second pipe portion;
a first disengagement blocking part, which allows a relative disengagement movement to a disengaged state where connection of the socket portion and the spigot portion is released, and blocks, by contact, a relative disengagement movement beyond a certain level between the socket portion and the collar in the disengaged state, the first disengagement blocking part being provided at a location where the collar and a socket portion side of the second pipe portion on the other side face each other in a pipe axis direction;
a second disengagement blocking part provided with a retaining part in which falling-off resistance between the retaining part and an outer peripheral surface of the spigot portion increases according to a disengagement movement of the spigot portion, the second disengagement blocking part being provided on a pipe support portion side on one end side in the pipe axis direction of the collar; and
a tilt restricting part including a tilt restricting element having a divided structure, a tilt restricting surface capable of coming into contact with an outer surface of the spigot portion that is tilted in the disengaged state, and a fixing connection part that fixedly connects the tilt restricting element to the socket portion.