Patent ID: 7210708

Claim:
A tube joint comprising: a cylindrical body comprising a resin material and having a first end portion, a second end portion and a curved portion; a connecting member comprising a metal material and connected to the second end portion of the cylindrical body, the connecting member having a fluid passage, a first annular projection at a substantially middle portion of the connecting member and a cylindrical portion at one end, the cylindrical portion of the connecting member being configured to be inserted into the second end portion of the cylindrical body and having an annular groove and second annular projection formed on an outer circumferential surface thereof, the annular groove detachably holding a seal member therein; an attachment/detachment mechanism connected to the first end portion of the cylindrical body and configured to receive a tube; and an endless metal ring member fitted to the cylindrical body and provided entirely within a gap between the first annular projection and the seal member such that the second end portion of the cylindrical body is directly pressed by the endless metal ring member from the outside toward the cylindrical portion of the connecting member and the endless metal ring member exerts non-adjustable tightening force when fitted to the cylindrical body, wherein the endless metal ring member has a diameter which is larger than a width in the axial direction thereof, the endless metal ring member is fitted to the cylindrical body at a position where the second end portion of the cylindrical body and the cylindrical portion of the connecting member are in contact with each other without a seal member provided therebetween, and the position is closer to the first annular projection.