US 12,000,755 B2
Watertight testing device for a pipe joint part
Shozo Kishi, Amagasaki (JP); Yuito Komaru, Amagasaki (JP); Koji Kamachi, Amagasaki (JP); and Masataka Shimomura, Amagasaki (JP)
Assigned to KUBOTA CORPORATION, Osaka (JP)
Appl. No. 17/441,719
Filed by KUBOTA CORPORATION, Osaka (JP)
PCT Filed Mar. 24, 2020, PCT No. PCT/JP2020/012958
§ 371(c)(1), (2) Date Sep. 22, 2021,
PCT Pub. No. WO2020/196496, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-055792 (JP), filed on Mar. 25, 2019.
Prior Publication US 2022/0196509 A1, Jun. 23, 2022
Int. Cl. G01M 3/04 (2006.01); F16J 15/10 (2006.01)
CPC G01M 3/04 (2013.01) [F16J 15/10 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A watertight testing device for conducting a watertight test on a pipe joint part in which a socket of one pipe receives an inserted spigot of another pipe, the pipe joint part being provided with a seal member between an inner surface of the socket and an outer surface of the inserted spigot, the watertight testing device comprising:
a cylindrical core fitted into the pipe joint part;
an annular first seal member for sealing between an outer surface of the cylindrical core and an inner surface of the one pipe;
an annular second seal member for sealing between the outer surface of the cylindrical core and an inner surface of the other pipe;
a first pressing member for pressing and compressing the annular first seal member into a first seal-member insertion space formed between the outer surface of the cylindrical core and the inner surface of the one pipe;
a second pressing member for pressing and compressing the annular second seal member into a second seal-member insertion space formed between the outer surface of the cylindrical core and the inner surface of the other pipe;
a moving device for moving the first and second pressing members in a pipe axial direction; and
a test fluid feeder for feeding a test fluid into a test space formed between the outer surface of the cylindrical core and the inner surfaces of the one pipe and the other pipe in a pipe diameter direction and between the annular first seal member and the annular second seal member in the pipe axial direction,
wherein a first engagement recess formed in the annular first seal member is engaged with a first engagement protrusion of a first pressing part of the first pressing member, and
wherein a second engagement recess formed in the annular second seal member is engaged with a second engagement protrusion of a second pressing part of the second pressing member.