Patent ID: 7837234
Filing Date: 2010-11-23
Classification: F16L,Y10T

Abstract:
1. A pipe joint unit comprising: a first pipe member including a male joint that has an outer peripheral surface; a second pipe member including a female joint that has an inner peripheral surface, the second pipe member coupled to the first pipe member such that the male joint is received in the female joint and the outer peripheral surface of the male joint is opposed to the inner peripheral surface of the female joint; and a pipe joint member including an engagement part that is elastically movable in a radial direction, and engaged with the first pipe member and the second pipe member, wherein the male joint and the female joint include rotation restricting parts on the outer peripheral surface and the inner peripheral surface, respectively, the rotation restricting parts are configured to restrict relative rotation of the first and second pipe members; the male joint includes an expansion expanding in a radially outward direction at an end thereof, the expansion forms the outer peripheral surface and the outer peripheral surface has a first fitting portion as the rotation restricting part, the female joint includes an expanded pipe portion that is located radially outside of the expansion of the male joint, the expanded pipe portion forms the inner peripheral surface, and the inner peripheral surface has a first fitted portion as the rotation restricting part, the first fitted portion is engaged with the first fitting portion so that the relative rotation of the first and second pipe members is restricted; the male joint includes a plurality of first fitting portions including the first fitting portion, the female joint includes a plurality of first fitted portions including the first fitted portion, and the plurality of first fitting portions and the plurality of first fitted portions are arranged at irregular intervals in circumferential directions of the male joint and the female joint.