Fluid coupling

A fluid coupling comprising:

• a coupling body having first and second end portions, an axial through hole, and a cylindrical outer peripheral surface arranged on the first end portion side, said through hole including a pipe insertion portion arranged on the first end portion side and a fluid passage portion arranged on the second end portion side;
• clamp means for radially and inwardly clamping, with a circumferentially uniform force, an outer peripheral surface of an end portion of a pipe inserted in the pipe insertion portion, said clamp means being axially immovable with respect to the pipe;
• a sleeve having first and second end portions and engaging means, and slidably mounted on the cylindrical outer peripheral surface of the coupling body, said engaging means being capable of moving the clamp means toward the second end portion of the coupling body;
• a spiral guide groove formed on one of the sleeve or the outer peripheral surface of the coupling body, both ends of said spiral guide groove being closed;
• a pin member formed on the other of the sleeve or the outer peripheral surface of the coupling body and slidable along the guide groove;
• rotation preventing means for engaging a plate like resilient stopper member with an engaging surface after said stopper member has run onto the second end portion of said sleeve at a position where the sleeve is moved for a predetermined distance from the first end portion of the coupling body to the second end portion as the pin member is guided along the guide groove, thereby preventing the sleeve and the coupling body from rotating further relative to each other at said position.