Hinge for metal window frames

摘要

The present invention refers to a hinge for metal window frames adapted to be fixed between the two traditional longitudinal ribs that define a longitudinal channel in the metal section because of the co-operation between a flat wing and a special plate that engages with the aforementioned channel; it being provided that the wing of the hinge is provided with a pair of bean-shaped slots for the insertion of corresponding screws that engage with the threaded holes of the plate, which is firmly fixed inside the metal frame channel following to oscillation caused by the sliding of the two screws into the bean-shaped slots.