Patent ID: 7488006

Claim:
A coupling assembly comprising: a first coupling member extending along an axis from a leading end to a trailing end and including a first exterior surface and a second exterior surface spaced from the first exterior surface by a rib that includes a ramp extending outwardly and away from the first exterior surface and a first locking surface that extends inwardly toward the second exterior surface; a second coupling member extending from a receiving end to a remote end and including an inwardly facing surface sized to receive the first coupling member, the second coupling member also including an inwardly facing annular groove configured to reduce stress risers in the second coupling member, the inwardly facing annular groove having a convex surface that defines a second locking surface; a resiliently expandable locking ring received in the second coupling member inwardly facing annular groove in a first position, the resiliently expandable locking ring having an interior diameter sized to receive the first coupling member first exterior surface and to be engaged and expanded to a larger radial size by the ramp upon movement of the first coupling member further into the second coupling member, the resiliently expandable locking ring configured to retract in diametrical size resiliently to become trapped between the first locking surface and the second locking surface in a second position upon further movement of the first coupling member into the second coupling member; and a release sleeve configured to urge the locking ring axially toward the rib, and in doing so, to be urged outwardly by the first locking surface, such that the first coupling member can be released from the second coupling member.