Patent ID: 8336924

Claim:
Coupling device for a fluid transfer line comprising: a male tubular end fitting; a connection means intended to be mounted around the male end fitting by being coupled to a female tubular end fitting by a radially internal face thereof, this means of connection comprising an axially interior coupling end able to become housed in a coupling groove of said internal face; and a locking member for locking said connection means, which locking member is configured to be mounted around the male end fitting in order reversibly to bring said coupling end into a locked position in said groove, wherein the connection means is formed as a single piece with the locking member of which it forms an axially interior end, the connection means comprising a radially internal bearing zone configured to be mounted against the male end fitting and ending in said coupling end, which comprises at least two tabs that are elastically deformable in the radial direction and extend the bearing zone radially outward, the radially external face and internal face of each tab being able to be jammed in the locked position, by a flexing of the tabs, respectively against said groove and against corresponding guide and locking-aid ramps disposed on the male end fitting and which are respectively associated with said tabs; wherein the external face of each tab has a convex surface comprising two, axially outer and inner oblique sections and an intermediate third section which are respectively configured to espouse two flared edges and a flat bottom of said groove; and wherein each of said ramps has an upper oblique portion extending radially outward and axially inward at an acute angle as far as said edge face, and an axial portion extending axially inward from this edge face, each of said tabs in the locked position straddling these two upper and axial oblique portions on either side of this edge face, so that said ramps alone jam during operation the corresponding tabs in said groove with these ramps deforming these tabs radially outward.