Patent ID: 7588230

Claim:
A plug-in safety coupling for pressure pipes, comprising: a coupler box pivotally mounted therein, the coupler box having a first oblong hole; a blocking member having a diametrical through bore in which a plug can be inserted in a depressurized state at an acute to a right angle with respect to the conducting position and brought into the conducting position by pivoting the plug; a cap-like locking sleeve having a hemispherical front end that is placed over the coupler box with the blocking member; the hemispherical front end having a second oblong hole which extends spherically from the center of the hemispherical front end along a great circle on the hemispherical front end; and the cap-like locking sleeve being rotatably mounted on the coupler box and actuated by a spring so that the second oblong hole extends at an angle with respect to a pivoting plane of the blocking member and the plug, and being rotatable against the force of the spring into the pivoting plane of the blocking member and the plug.