the initial position shown in fig5 fig6 shows a further tool embodiment in which the adapter 20 again essentially corresponds to the adapters 20 in accordance with fig1 to 5 thus only the different characteristics are addressed and reference is otherwise made to the above explanations the connecting element 20 10 of the adapter 20 has a receptacle into which a bent tube 66 2 is inserted and is held there an element 66 7 of low flexural strength in this case a link chain such as is also used in principle in propulsion technology is inserted into the tube 66 2 with its one end the link chain is pivotably fastened to the seating receptacle 15 of the piston rod 14 at the other chain end the last chain link constitutes or forms the expeller mandrel 65 fig6 again shows the initial tool position when actuating the trigger 12 1 the piston rod 14 is displaced such as downward in the process it enters into a cylindrical connecting area of the tube 66 2 the link chain is displaced in the tube 66 2 and in the process the tube 66 2 prevents the link chain from kinking the expeller mandrel 65 is supported on the support face 53 of the chisel 50 and pushes it out.