71 a second connection is provided between machine 40 and u shaped bracket 12 consisting of a piston cylinder assembly 4 a that extends between hinge 70 c on the machine 40 and hinge 73 on the bracket 12 hinge 73 is located above hinge 71 a further connection is provided between the arm 110 and the machine 40 with piston cylinder assembly 4 d in order to move the arm 110 up and down piston cylinder assembly 4 d is connected at hinge 72 to boom 110 and at hinge 70 b to machine 40 a kings post 2 is connected to both ends of the u shaped bracket 12 by means of a first connection consisting of a hinge 75 a piston cylinder assembly 4 c a hinge 74 and a bracket 3 a located at a distance above the lower end of the post 2 and by means of a second connection consisting of a hinge 79 and a bracket 3 b located at the lower end of the post 2 a lance 5 is supported by the post 2 and can be moved up and down along the post 2 in the directions p by means of means that are known per se and not further shown by way of background information as illustrated in fig4 a and 4b the lower end of the lance 5 is connected to an end of drainage ribbon 9 which is unwound from a supply roll not shown arranged on the post 2 the lower end.