{
  "$type": "site.standard.document",
  "description": "A pipe fastening structure includes an end member 16 attached to an end part of a metal pipe 10, and a nut 12 for fastening the end member 16 attached to the metal pipe 10 to a counterpart 14. In the pipe fastening structure, the end member has a first spherical part 20 to be brought into contact…",
  "path": "/patents/1011998",
  "publishedAt": "2011-06-15T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02M55/005",
    "SANOH IND CO LTD [JP]"
  ],
  "textContent": "A pipe fastening structure includes an end member 16 attached to an end part of a metal pipe 10, and a nut 12 for fastening the end member 16 attached to the metal pipe 10 to a counterpart 14. In the pipe fastening structure, the end member has a first spherical part 20 to be brought into contact with a sealing surface 27 of the counterpart 14, a second spherical part 21 formed integrally with the first spherical part 20 so as to be in contact with a sliding surface 25 formed in the nut 12, and a neck 18 continuous with the second spherical part 21 and having the shape of a straight pipe. The outside diameter D 1 of the neck 18 is approximately equal to outside diameter D of the metal pipe, the respective centers of spheres respectively defining the first and the second spherical parts are on the axis of the neck, and the ratio of the ratio a = D 2/ D, where D 2 is a diameter of a contact circle on the first spherical part in contact with the sealing surface and D is the outside diameter of the metal pipe to the ratio ² = D 3 /D, where D 3 is a diameter of a contact circle on the second spherical part in contact with the sliding surface of the nut and D is the outside diameter of the metal pipe meet an expression: 1.0 ‰¥ a / ² ‰¥ 0.80",
  "title": "Pipe fastening structure"
}