Patent ID: 7100948

Claim:
A tube coupling adapted to receive and hold an end portion of a tube, the end portion having a periphery and a terminal end face, the tube coupling comprising: a coupling body having a throughway open at one end, the throughway adapted to receive the end portion of the tube, the throughway extending through the coupling body so as to allow fluid to pass through the coupling body; a seal encircling the throughway, the seal being adapted to seal with the periphery and the terminal end face of the tube when the tube is received within the throughway; and a cap mounted on the coupling body, the cap having a tube locking device rotatably mounted therein, the tube locking device being adapted to engage and hold the tube in the cap in the axial direction out of the cap, an annular member being provided in the cap acting between the coupling body and tube locking device to resist rotation of the tube locking device with respect to the coupling body; the cap and coupling body having first interengaging means for guiding the cap on the coupling body in an axial direction along the coupling body with rotation of the cap from a first position in which when the tube is inserted through the cap and into the seal in the throughway the tube is retained by the locking device and a second position advanced along the coupling body from the end thereof in which when the tube has been inserted the tube end is held positively in engagement with the seal in the throughway, wherein second interengaging means are provided between the locking device and coupling body for resisting rotation of the locking device with respect to the cap whereby rotation of the cap between the first and second positions does not cause the tube to rotate.