Patent ID: 6957833

Claim:
A tube coupling comprising a coupling body having a throughway open at one end to receive an end portion of a tube, a seal encircling the throughway to seal with the outer face and end of the tube and a cap mounted on the body having a tube locking device to engage and hold the tube in the coupling body, the cap and body having interengaging means for guiding the cap on the body for rotation and simultaneous axial movement between a first position on the coupling body and a second position further along the body such that when the cap is in the first position the tube can be inserted through the cap into the seal in the throughway and held therein by the locking device and on rotating the cap into the second position, the tube held by the locking device is forced against the seal in the throughway, wherein the interengaging means between the cap and the body comprises one or more abutments formed on the inner side of the cap and one or more corresponding grooves in the outer side of the body extending from the end thereof to receive the abutments and having detent means spaced from the end of the body past which the abutments in the cap snap to retain the cap on the body to define said first position of the cap, the grooves extending spirally around the body from the detent means for rotation of the cap with respect to the body and to draw the cap further along the body and means are provided at the ends of the spirally wound grooves to retain the projections at the ends thereof and to define the second position of the cap in the positions in which the tube in the cap is pressed against the seal in the throughway.