Patent ID: 7032932

Claim:
A tube coupling comprising: a coupling body having a throughway open at one end, at least a portion of the throughway being adapted to receive a tube; an end cap in screw-threaded engagement with the coupling body to move between initial and advanced positions along the coupling body and having an opening for the tube and an internal tapering cam surface; a collet at least partially disposed in the end cap engaging the cam surface to lock the tube in the cap with movement of the collet outwardly of the cap and to release the tube when depressed inwardly of the cap; stop means in the coupling body for limiting movement of the collet inwardly of the end cap, the initial position of the end cap on the coupling body allowing the tube to be inserted and locked in the end cap by the collet and to be released by depressing the collet inwardly of the end cap and the advanced position of the end cap holding the collet adjacent the stop means in the coupling body to prevent release of the tube; and detent means acting between the end cap and coupling body for providing resistance to movement of the end cap along the coupling body until the end cap reaches said initial position on the coupling body and to allow said further movement of the end cap to the advanced position, the detent means comprising a flexible diaphragm encircling one of the coupling body and the end cap and an annular slot in the other of the end cap and coupling body in which the diaphragm is snap engaged in said initial position of the end cap on the coupling body, the slot having a width which accommodates the travel of the diaphragm.