US 12,188,594 B2
Coupling fittings and coupling structure
Tetsuharu Kawasaki, Tokyo (JP); and Kazuyuki Tamada, Tochigi (JP)
Assigned to SAKURA RUBBER CO., LTD., Tokyo (JP)
Filed by SAKURA RUBBER CO., LTD., Tokyo (JP)
Filed on Apr. 7, 2023, as Appl. No. 18/297,100.
Application 18/297,100 is a continuation of application No. PCT/JP2021/036790, filed on Oct. 5, 2021.
Claims priority of application No. 2020-171187 (JP), filed on Oct. 9, 2020.
Prior Publication US 2023/0243448 A1, Aug. 3, 2023
Int. Cl. F16L 37/113 (2006.01); F16J 15/10 (2006.01); F16L 37/084 (2006.01); F16L 37/252 (2006.01)
CPC F16L 37/0847 (2013.01) [F16J 15/10 (2013.01); F16L 37/113 (2013.01); F16L 37/252 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A coupling structure including a first coupling fitting and a second coupling fitting, wherein the first coupling fitting comprises:
a cylindrical first body having a first end portion;
a first coupling part having a plurality of first protrusions arranged around the first end portion, the plurality of first protrusions having hooks defined thereon; and
a first seal material disposed on an outer circumference of the first end portion,
wherein the second coupling fitting comprises:
a cylindrical second body having a second end portion and a channel having a diameter larger than an outer diameter of the first end portion of the cylindrical first body;
a second coupling part having a plurality of second protrusions arranged around the second end portion, the plurality of second protrusions having hooks defined thereon; and
a second seal material protruding more than a distal end surface of the second end portion in an axial direction of the cylindrical second body,
wherein a gap is defined between the outer circumference of the first end portion and the plurality of first protrusions,
wherein the gap is greater than a thickness of the second end portion, and
wherein, when the first coupling fitting is coupled with the second coupling fitting, the second end portion and the second seal material are configured to be inserted into the gap, the hooks of the plurality of first protrusions and the hooks of the plurality of second protrusions are configured to be engaged, and the first seal material is configured to contact an inner circumference of the cylindrical second body.