Hinged doors for wall-cupboards and the like

Claim 1

A CUPBOARD COMPRISING TWO LATERAL PARALLEL WALLS, AN UPPER WALL AND A LOWER WALL, A DOOR FOR CLOSING SAID CUPBOARD, SAID DOOR BEING FORMED OF TWO PANELS HINGEDLY INTERCONNECTED ALONG THEIR ADJACENT EDGES AND ADAPTED, IN THEIR OPEN POSITION, TO BE FOLDED BACK PARALLEL TO AND AGAINST EACH OTHER ALONG SAID UPPER WALL OF SAID CUPBOARD, THE FIRST OF SAID PANELS, THAT IS THE ONE NEAREST TO SAID UPPER WALL AGAINST WHICH IT IS TO BE STOWED, COMPRISIGN ON EACH OF ITS LATERAL EDGES PERPENDICULAR TO SAID HINGE MEANS A FIRST GUIDING DEVICE, SAID FIRST GUIDING DEVICE CO-ACTING WITH PLAIN GUIDE TRACKS PROVIDING ON SAID LATERAL PARALLEL WALLS, SAID FIRST PANEL COMPRISING ALSO A SECOND GUIDING DEVICE MOVABLE IN RELATION TO A FIXED POINT ON SAID PARALLEL WALLS, SAID SECOND PANEL COMPRISING ALSO A GUIDING, BALANCING AND LIFTING DEVICE CONSISTING OF A TORSION BAR MEANS FIXEDLY SECURED BY AT LEAST ONE POINT THEREOF TO SAID CUPBOARD, SUBSTANTIALLY PARLLEL TO THE PLANE OF THE DOOR OPENING, AND HAVING A PAIR OF ENDS ROTATABLY JOURNALLED IN BEARINGS PROVIDED AT BOTH LATERAL SIDES OF SAID CUPBOARD, AND A PAIR OF SUBSTANTIALLY SYMMETRICALLY DISPOSED ARMS PIVOTALLY MOUNTED AT ONE END ON THE LOWER PART OF SAID SECOND PANEL AND RIGIDLY SECURED AT THEIR OTHER END TO SAID TORSION BAR MEANS.