Abstract: A tubular coupling comprising a female connector (2) into which a male connector (6) provided with an annular collar (7) is designed to be inserted axially, and a connection element (9) that extends in a transverse direction in the female connector. The connection element is designed to interfere mechanically with the collar while the male connector is being inserted into the female connector, and to move by itself in said transverse direction towards the inside of the female connector. In addition, the connection element and the female connector are also designed so that, after the reaction to the radial resilient deformation of the connection element on the collar of the male connector, they come to bear against each other in the manner of a projection (14) that, by resilient return, exerts pressure on a guide ramp (15), so as to generate a thrust force that extends the movement of the connection element towards the inside of the female connector.

Abstract: The invention relates to a connection device (10) comprising: a socket end (12), a spigot end (11) which is intended to be inserted into the socket end (12) and a locking member (18) which is intended to hold the spigot end (11) in the socket end (12) once they have been connected. The locking member (18) is shaped in the form of a staple comprising a head with two side arms. The spigot end (11) comprises an actuating cone which is used to lift the locking member (18) and to position the spigot end (11) between the arms of the locking member (18). The locking member (18) preferably comprises a deformable tongue on each side arm. The deformable tongues form elastic return means which return the locking member (18) to the locked position and block the spigot end (11) in the socket end (1) in the end-of-insertion position.

Abstract: A coupling comprises a socket member (1) and a sealing ring (10) that is fixable in a receiving space (4) adapted to receive an insert member (13) insertable into the socket member (1) in an insertion direction. In assembled arrangement, the sealing ring (10) bears against mutually opposite contact surfaces (9, 11), said contact surfaces (9, 11) lying partially outside a plane oriented at right angles to the insertion direction. The insert member (13) thereby comes into contact first with front portions and then gradually with rear portions of the sealing ring (10), such that appreciably lower insertion forces are required because of the porportionately low static friction forces.

Abstract: A tube coupling including a female connector a body into which a male connector having an annular collar is inserted axially, and a connection element is provided. The connection element extends in a transverse direction within the body of the female connector. The connection element is designed to interfere mechanically with the collar during insertion of the male connector and to move transversely of its own accord towards the inside of the female connector. The connection element includes a locking hook that cooperates with a locking catch provided in the female connector. The hook goes past the catch as a result of the mechanical interference of the collar that drives axial and radial elastic deformation of the connection element. The hook locks against the catch when the connection element is fully pushed into the female connector.