s cabin 5 or the operator 39 s cab frame 1 in this respect the arrangement of the operator 39 s cab frame 1 is selected such that the spacing between the operator cabin 5 and the equipment 6 disposed to the right thereof or the superstructure 7 is matched to the stiffness of the operator 39 s cabin 5 and the operator 39 s cab frame 1 such that initially a maximum of energy is introduced into the frame without appreciably deforming the cabin it is hereby ensured that the survival space for the operator on the rollover is maintained for as long as possible and nevertheless sufficient energy can be destroyed for the protection of the machine operator the cabin structure is in particular configured in this respect such that its stiffness on lateral loading is higher than that of the operator 39 s cab frame in conjunction with the base plate and the elastic bearings so that the operator 39 s cab frame 1 the base plate 3 and the elastic bearings 2 are ideally involved in the energy reception the cabin structure thus only starts to be appreciably deformed when an energy absorption by the operator 39 s cab frame 1 the base plate 3 or the elastic bearings 2 is no longer possible this is.