Patent ID: 6880864

Claim:
A tube joint comprising: a body made of a resin material having an edge and an opening at a second end of said body; an attachment/detachment mechanism into which a tube is configured to be inserted and which comprises: a fastening device configured to fasten a tube from an outer circumference surface of the tube when the tube is inserted from the opening at the second end of the body; a sleeve configured to engage with an inner circumference surface of the tube when the tube is inserted from said opening at said second end of said body; a release device provided radially outside said sleeve such that said tube is inserted into an annular space formed between said sleeve and said fastening device and release device for engagement, thereby allowing a fluid to flow through said tube into said opening at said second end; and an engaging member provided outside said release device and having a projection which outwardly projects from an outer circumferential surface of said engaging member and which engages with an inner circumferential wall surface of said body at said second end; a ring member fitted to an outer circumferential wall surface of said body at said second end; and an additional ring member fitted to the outer circumferential wall surface of said second end of said body and pressing the outer circumferential wall surface of said body radially inwardly for preventing said body from being deformed, said additional ring member being positioned such that the projection of said engaging member is located between the ring member and the additional ring member, wherein a part of said body at said second end is tightly sandwiched between said ring member and said engaging member, and said release device is placed inside said engaging member for preventing said tube in said annular space from being disengaged from said attachment/detachment mechanism.