the hinge 21 a countersunk head locking screw 55 is furthermore provided which engages in a conical hole 56 provided on the arm 54 and screws into a threaded seat 57 defined by the small block 50 the tightening of the small block 50 against the arm 54 which is performed by means of the screw 55 causes a sliding of the sloping planes 52 and 53 with the consequent tightening inside the seat thus obtaining the fixing of the hinge and of other accessories if required without having to bore holes or perform other complicated processes it should be furthermore noted that with the embodiment described it is possible to obtain a double glazing which besides being self supporting and therefore acting in itself as a frame for the casing is obtainable with a slightly greater thickness with respect to the conventional thicknesses with remarkable improvement regarding the thermo acoustic insulating characteristics according to what has been illustrated in fig6 and 7 it is also possible to obtain double glazing of the glass chamber type indicated generally with the reference numeral 101 which is composed of a framework with a closed shape produced by means of profiled elements generally indicated with the reference numeral 102 to which glass panes 103 and 104 are connected which couple to the sides of the profiled element 102 by means of a layer 105 of waterproofing material which prevents any inward infiltration of moisture the panes 103 and 104 protrude with respect to the framework composed of the profiled elements 2 so as to define around the same framework a seat in which it is possible to introduce in a per se known manner an adhesive material indicated with the reference numeral 106 which performs the mechanical coupling between.