Patent ID: 7434845

Claim:
A quick connector for connecting a flexible tube to a mating pipe, comprising: a connector body which is formed in a tubular shape as a whole, the connector body having on its one axial side a retainer holding portion for insertion of the mating pipe therein, on its other axial side a tube connecting portion to be press fitted into the tube, and a housing between the retainer holding portion and the tube connecting portion, the tube connecting portion being formed with a plurality of annular projections having surfaces whose diameters linearly increase towards the housing at one or more rates and that serve as detents for the tube by biting into an inner surface of the tube, the annular projections being formed in such a way as to be axially spaced apart from each other; a retainer which is held in an axially fixed state by the retainer holding portion and serves as a detent for the mating pipe by axially engaging an engaging portion on an inner peripheral side thereof with an engageable portion of an outer peripheral surface of the mating pipe; and a seal member which is fitted in the connector body and located in a seal holding portion of the housing, and serves as a seal by coming into contact with an outer peripheral surface of the inserted mating pipe; wherein a portion of an outer surface of the tube connecting portion extending from the annular projection, which is closest to the housing, all the way to the housing is formed into a tapered surface whose diameter continuously, gradually and linearly enlarges toward the housing at a rate less than the one or more rates of any of the surfaces of the plurality of annual projections, and a diameter of an annular projection side of the tapered surface is set to be larger than a diameter of the outer surface of the tube connecting portion between the annular projections.