Safety hinge

As from a conventional semi-hinge fixed to the frame, a complementary door fixing semi-hinge having, emerging perpendicularly from its base plate (1), a slide (3) destined to be housed in a blind hole on the door edge, a slide which is closed by its free end by means of a lid (12) and having a pair of opposite longitudinal guides (4), in which respective sets of balls have been fitted for the sliding of a runner (8), provided with complementary guides (4') for the mentioned set of balls and which is an elbowed extension of an arm (9) finishing in the bushing (10) or hinge itself, across which this semi-hinge is articulated to the semi-hinge fixed to the frame. Complementarily, slide (3) and runner (8) define a cylindrical housing (5-5') in which a spring (7) is housed, which in the case of the upper hinge tends to press the leaf against the frame and in the case of the lower hinge, tends to separate these components.