Patent ID: 7445249

Claim:
A coupling, comprising: a plug-in part configured with a retaining ring; and a receiving element for receiving said plug-in part, including a securing element having two arms and a retaining section, said securing element insertable into a receiving space of said receiving element and movable substantially perpendicularly to an insertion direction of said plug-in part between an extended position and a pushed-in position; said receiving element and said securing element including a blocking arrangement wherein, if said plug-in part is not correctly inserted in said receiving part, elements of said blocking arrangement that are configured on said receiving element and on said securing element engage with one another to prevent said securing element from being moved from said extended position to said pushed-in position, wherein an element of said blocking arrangement that is configured on said receiving element is a bridge section bounding said receiving space and extending transversely to the insertion direction; said blocking arrangement further including free ends of said arms of said securing element, and said bridge section having a width that is greater than the distance between said arms in the extended position of said securing element, wherein when said retaining ring is disposed in the vicinity of said arms, said arms are spaced from one another such that the engagement between the bridge section and said free ends of said arms is released and said securing element can be moved into the pushed-in position, said retaining section engaging behind said retaining ring.