23 and 24 are easily connected to their respective mounting plates by screws which is facilitated by mounting holes 25 and 26 respectively disposed within the comb tines fig4 shows also screws 27 28 29 30 and 31 which connect the supporting molds 23 24 to the mounting plates 20 21 and also to the mold parts 2 3 these supporting molds 23 24 act in a simple manner as uniform supports requiring less expense than the supports 12 13 drawn as in the embodiment of fig1 or the otherwise needed arch shaped supports made out of woodchip material that is a few centimeters thick due to the rigidity of the supports plate 21 may be made out of intermediate strength chip plate 19 mm which allows fast and easy work and still assures safety of the mold part against dislocation longitudinal deformation and swivelling through the supporting mold 24 fig5 shows another alternate embodiment wherein here again respective parts are provided with the same reference numerals as in fig1 to 4 because the basic construction has not been changed the main change in respect to the embodiment of fig5 consists in a spacer strip 32 disposed between the mold part 2 and the supporting mold 24 this spacer strip 32 is for instance 42 mm broad and causes a corresponding distance between mold part 2 and supporting mold 24 such spacer strips may basically aid in changes of the radius in order to use an occasionally available mounting plate 21 for a slightly different radius in this respect staggered spacer strips may also make it possible to find multiple uses for off the shelf stored mounting plates much more important is the case that for wings of a window at first the window frame must be bent.