Patent ID: 6328351
Filing Date: 2001-12-11
Classification: F16L,F28F

Abstract:
A pipe joint comprising:a joint base member having an opening for a fluid conduit;a metal pipe having a first enlarged portion, a second enlarged portion, a bulging portion and an extending portion; anda flange member having first and second end surfaces and an installation bore penetrating from the first end surface to the second end surface, and fixed with the joint base member on a side of the first end surface, the installation bore being provided at an end thereof on a side of the first end surface with a plate shaped enlarged portion, a circular holding surface at another end thereof on a side of the second end surface, and an intermediate inner circumference surface between the plate shaped portions and the cylindrical holding surface, said intermediate inner circumference surface being provided with a plurality of convex and concave portions, wherein the first enlarged portion protrudes from the plate shaped enlarged portion and inserted into the opening, an outside circumference surface of the second enlarged portion is engaged with the intermediate inner circumference surface and the cylindrical holding surface inside the installation bore, the bulging portion rises from the pipe so as to be in contact with the second end surface at another end of the installation bore and the extending portion is extended from the bulging portion in a direction opposite to the first enlarged portion, and, further, wherein the inside diameter of the second enlarged portion is larger than that of the extending portion and smaller than that of the first enlarged portion, the outside circumference surface of the second enlarged portion is in mesh with the concave and convex portions, the entire cylindrical holding surface being equal to or smaller in diameter than a diameter defined by the convex portions of the intermediate inner circumference surface so as to prevent a rotating movement of the pipe so as to seal a clearance between the pipe and the installation bore on a side of the second surface, and the first enlarged portion and the bulging portion are rigidly pressed against the flange member on both sides of the first and second end surfaces, respectively, so that an axial movement of the pipe may be prevented, and, furthermore, wherein the bulging portion is formed in a manner that a part of the second enlarged portion is forced out longitudinally when the second enlarged portion is formed.