AUTOMATIC RETURN HINGE WITH FORCE INVERTER FOR FIRE DOORS

摘要

An automatic return hinge for fire doors adapted to be mounted on a wall (12) within a jamb frame (12') on which a leaf (14) of such door is provided. Such hinge comprises a frame-side portion (15) and a door- side portion (16), the frame-side portion is (U)-shaped and comprises a first fixing plate 17, which is fixed to the door case that extends in a pair of side tubular elements (18). The door-side portion comprises a second fixing plate (20), which is fixed to the door itself and rotates therewith, that extends in a central tubular element (21). The side tubular elements (18) and the central one (21) are aligned with each other to form altogether an overall tubular element inside which both an automatic door re-closing device and a device for inverting the force of the door re-closing movement are positioned, which cooperate with each other to generate a controlled movement of automatic re-closing, thus controlling the rotation movement of the central tubular element and accordingly of the second door fixing plate.