Automatic coupling device

A coupling device for the end-sealed coupling of two substantially tubular or rod-shaped coupling pieces (19, 21), which allows to connect the coupling pieces to be joined together with a defined contact pressure sealed frontally comprises the following featuresa base part (1) on which a first (19) of the two coupling pieces (19, 21) is displaceably guided substantially in the direction of its tube axis (23)one stop each on the two coupling pieces (19, 21) in order to define the coupling end position,a claw (39), which is pivotably hinged to the base part and is coupled to the first coupling piece (19) via a driving member (47; 61), as well asa wedge surface gear between the second coupling piece (21) and each claw (39), wherein each claw (39) to the tube axis (23) of the coupling pieces (19, 21) is resiliently biased towards.