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    • 10. 发明专利
    • Pipe joint structure and the connecting pipe
    • JP5377095B2
    • 2013-12-25
    • JP2009138737
    • 2009-06-10
    • 株式会社クボタ
    • 正蔵 岸貴司 横溝昌功 井谷正吾 金子崇哲 香川幸平 池田
    • F16L21/08F16L21/02
    • PROBLEM TO BE SOLVED: To provide a pipe joint structure reducing an inserting force to be required for inserting a cut pipe spigot into a connection pipe socket. SOLUTION: In the pipe joint structure, a cut pipe is connected to another pipe via a connection pipe. The connection pipe has the connection pipe socket and a connection pipe spigot, the cut pipe has the cut pipe spigot inserted into the connection pipe socket, a space between the cut pipe spigot and the connection pipe socket is sealed by a seal material 12, and the seal material 12 has a first valve 30 and a second valve 31. On the outer periphery of the first valve 30, a first seal portion 37 is formed to be pressed against the inner peripheral face of the connection pipe socket. On the inner periphery of the second valve 31, a second seal portion 38 is formed to be pressed against the outer peripheral face of the cut pipe spigot. A constricted portion 33 is formed on a joint area between the first valve 30 and the second valve 31. The second valve 31 has an inner diameter set smaller than the outer diameter of the cut pipe spigot, and it is expandable in the radial direction of the pipe with the deformation of the constricted portion 33. COPYRIGHT: (C)2011,JPO&INPIT