Abstract: A fifth-wheel coupling (1) having a coupling plate (2) with an entry opening (4) for a king pin (5) includes an at least single-part locking device (100) for fastening the king pin (5) and a fixing element which engages on the locking device, which fixing element can be moved from a locking position into an open position and vice versa. A securing device (15) with a blocking element (40, 400) is provided, which blocking element (40, 400) can be moved from a rest position into a blocking position and vice versa, wherein the blocking element (40, 400) projects into the entry opening (4) at least in the blocking position.

Abstract: A plug element (1) for connecting supply lines of an articulated train with at least one line element (3) including a fluid contact (4) located in the housing (2) of said train, that is able to be brought into functional engagement with a second plug element (5). The plug element (1) remains in an operationally safe position without the pre-stressing force of a spring element (11a, 11b). The housing (2) of the plug element (1) can be moved laterally relative to a connection socket (6) that is fixed in space and the cross sectional area (AD1, AD2) for pressurization of the line element (3) is configured such that upon impingement with compressed air a force acts in the direction of insertion (8).

Abstract: A plug element (1) for connecting supply lines of an articulated train with at least one line element (3) comprising a fluid contact (4) formed thereon located in the housing (2) of said train, said fluid contact able to be brought into functional engagement with a second plug element (5). The object of the invention was to provide a plug element (1) that remains in an operationally safe position without the pre-stressing force of a spring element (11a, 11b). The object is met according to the invention by a plug element (1) in which the housing (2) can be moved laterally relative to a connection socket (6) that is fixed in space and the cross sectional area (AD1, AD2) for pressurization of the line element (3) is configured such that upon impingement with compressed air a force acts in the direction of insertion (8).

Abstract: A plug-in system for trailer vehicles provided with an automatic coupling system of the supply lines, including a plug (1) supporting the line contacts (1a) and a socket (2). The plug (1) has guide elements (4) that actively engage when approaching the guide elements (5) of the socket (2). The centering of a plug system for an automatic coupling system of supply lines on an articulated train is achieved by the guide elements (4) include a main guide pin (6) and at least one centering pin (7a, 7b) arranged at a distance therefrom. At least the centering pin (7a, 7b) and/or the associated guide element (5, 9) is elastic in the radial direction.