Pipe joint

1. A pipe joint comprising a pressing nut into which a pipe is inserted, a joint body into which said pressing nut is partially inserted, a sealing member for sealing said pipe and said joint body, a retainer engaging said pipe to prevent said pipe from being attached, a stop ring, and an engaging mechanism for keeping said pressing nut in said joint body;

said engaging mechanism comprising a first engaging groove and a second engaging groove, and an annular groove formed on an outer surface of said pressing nut for receiving said stop ring, wherein said first engaging groove and said second engaging groove are formed on an inner surface of said joint body for receiving said stop ring and communicating with each other; and

each of said first engaging groove and said second engaging groove having a tapered groove, both tapered grooves adjacent to each other forming an annular projection having both inclined side surfaces, and said stop ring being movable in both directions between said first engaging groove and said second engaging groove passing said annular projection,

whereby said stop ring engages both of said annular groove and said first engaging groove until the connection of said pipe is completed, and

when a force in a drawing direction is applied to said pipe after completing the connection of said pipe, said stop ring moves from said first engaging groove to said second engaging groove on the inlet side thereof and said stop ring engages both of said annular groove and said second engaging groove, so that said pressing nut is drawn from said joint body to such an extent that the normal connection of said pipe can be confirmed.

2. The pipe joint according to claim 1 , comprising a resilient means unlocked to expand when pushed by a tip end of said pipe, said sealing member pushed toward the inlet by the expansion of said resilient means sealing said pipe and said joint body.

3. The pipe joint according to claim 1 , wherein a side surface of said annular projection has such an inclination angle that though said stop ring does not pass said annular projection by the action of said resilient means, said stop ring passes said annular projection by a force of drawing said pipe for the confirmation of connection.

4. The pipe joint according to claim 1 , wherein said pressing nut is provided with an indicator, which is shielded by said joint body until the connection of said pipe is completed, and when said pipe is pulled after completing the connection, said pressing nut is drawn from said joint body, and said indicator appears from said joint body, so that the normal connection of said pipe can be confirmed.

5. The pipe joint according to claim 4 , wherein said indicator is a ring detachably attached to said pressing nut.

6. The pipe joint according to claim 5 , wherein when said pressing nut is pushed inward said joint body with said indicator ring detached from said pressing nut, said stop ring is received in a third engaging groove on the inward side of said first engaging groove to break engagement with said annular groove, so that said pressing nut can be removed from said joint body.