Quick-release Johnston coupling

A Plug-in coupling for connecting a first double-walled vacuum-insulated cryogenic line to a second, wherein the plug-in coupling comprises:

• a coupling plug;
• and
• a coupling socket,
• wherein the coupling plug has an outer pipe piece and an inner pipe piece and also a first connection flange and is connected to the first cryogenic line,
• wherein the coupling socket has an outer pipe piece and an inner pipe piece and also a second connection flange and is connected to the second cryogenic line,
• wherein the coupling plug can be plugged into the coupling socket, these being retained in a plugged-together state by fixing means,
• wherein a guide column is arranged on the coupling plug or on the coupling socket, said guide column being accommodated in a guide means on the coupling socket or on the coupling plug when the coupling plug has been plugged into the coupling socket, and in that the guide column has arranged on it elastic means which, in the assembled state of the plug-in coupling, are subjected to stressing and which subject the coupling plug and/or coupling socket to an elastic force which strives to release the coupling plug and coupling socket from one another.