Patent ID: 8490249

Claim:
A hinge plate for connecting a leaf of a door or a sash of a window to a frame so as to be hinged about a hinge axis, the hinge plate comprising: a frame hinge plate part configured to be fastened to the frame, the frame hinge plate part comprising a frame fastening part and a frame hinge part; a leaf or sash hinge plate part configured to be fastened to the leaf or sash, the leaf or sash hinge plate part comprising a leaf or sash fastening part and a leaf or sash hinge part; and a primary coil disposed in the frame hinge part and a secondary coil disposed in the leaf or sash hinge part, the primary coil and the secondary coil each surrounding a hinge plate pin defining the hinge axis; wherein the hinge plate pin is provided as a core for both the primary coil and the secondary coil and to conduct conduct magnetic flux lines, and the hinge plate pin comprises a support element which transmits a mechanical force between the leaf or sash and the frame, and a flux element which conduct the magnetic flux lines between the primary coil and the secondary coil.