Coupling for Power Cables

A coupling for power cables having a plug part (1) and a socket part (7), said plug part (1) and said socket part (7) comprising a device for connecting a power cable (6) in a fixed manner, said plug part (1) comprising a basic body (2) which has a coupling pin (3) projecting over a front side (27) of the basic body (2) and is arranged in the axial direction of the coupling and has a locking pin (4) laterally arranged on the coupling pin (3), said socket part (7) comprising a basic body (8) which is provided with an axial bore (9) for accommodating the coupling pin (3), said axial bore (9) comprising, in a bore wall (29), a groove (10) which starts from a front side (28) of the basic body (8) and comprises a helical segment (24) and extends to the front end of the basic body (8), said groove (10) serving to accommodate a locking pin (4) of the plug part (1) such that when an engagement connection is produced between the plug part (1) and the socket part (7), the coupling pin (3) is inserted into the bore (9) of the socket part (7) in such a manner that the locking pin (4) is accommodated in the groove (10) of the socket part (7) and the plug part (1) and the socket part (7) are clamped against each other like a bayonet connector by means of the locking pin (4) guided in the groove (10) via a subsequent relative rotation of the plug part (1) and the socket part (7), characterized in that the locking pin (4) is displaceably mounted in the plug part (1) in the axial direction of the coupling pin (3), said locking pin (4) being held in a basic position towards a back end (11) of the coupling pin (3) by means of a spring device (16) and said locking pin (4) being displaced towards the free end (12) of the coupling pin (3) by interlocking with the groove (10) in the socket part (7) when the engagement connection is produced between the plug part (1) and the socket part (7) and the spring device (16) thus being loaded so as to form a pre-load force.