US 11,988,306 B2
Joining structure, pipe joint, and method for forming joining structure
Shinji Fukaya, Nakatsugawa (JP)
Assigned to IHARA SCIENCE CORPORATION, Tokyo (JP)
Appl. No. 17/269,302
Filed by IHARA SCIENCE CORPORATION, Tokyo (JP)
PCT Filed Aug. 1, 2019, PCT No. PCT/JP2019/030250
§ 371(c)(1), (2) Date Feb. 18, 2021,
PCT Pub. No. WO2020/054243, PCT Pub. Date Mar. 19, 2020.
Claims priority of application No. 2018-170430 (JP), filed on Sep. 12, 2018.
Prior Publication US 2021/0215282 A1, Jul. 15, 2021
Int. Cl. F16L 19/065 (2006.01); F16L 19/08 (2006.01)
CPC F16L 19/065 (2013.01) [F16L 19/08 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A pipe joint that is joined to a pipe member;
a first member in which a housing space for housing a pipe end of the pipe member is formed; and
a cylindrical member interposed between an outer peripheral surface of the pipe end and a housing surface, the housing surface being an inner peripheral surface of the first member forming the housing space, and
a pushing member that applies axial force to the cylindrical member, wherein
on a cross section parallel to an axial direction of the cylindrical member, a plurality of annular protrusions is provided on an inner peripheral surface of the cylindrical member along the axial direction;
the pipe joint is configured to generate radially inward force on the cylindrical member by an axial force applied by the pushing member;
the first member is formed with a force concentrating portion that concentrates the radially inward force on a part of the outer peripheral surface of the cylindrical member when moving along the outer circumferential surface of the cylindrical member, and
the force concentration portion crushes and deforms the cylindrical member at the location where the radially inward force is concentrated, and
as the force concentration portion moves along the outer circumferential surface of the cylindrical member, the plurality of annular protrusions bite into the outer circumferential surface of the tube member one by one along the axial direction,
the joining structure airtightly or liquid-tightly joining the outer peripheral surface of the pipe end and the inner peripheral surface of the cylindrical member, making the pipe member and the cylindrical member inseparable.