e, Figs 6 and 7 show embodiments of a winding guide means and a drive means in the apparatus according to Figs 3 and 4, Figs 8-12 show an embodiment of a chain link for use in the apparatus according to Figs 3 and 4, Fig. 14 is a perspective view illustrating the winding up of the interlocking chain links in a helical winding under mutual retainment, Fig. 15 is a schematical perspective view of a