Overhead door retaining means

Claim 1

AN OVERHEAD DOOR CONSTRUCTION COMPRISING, IN COMBINATION WITH A BUILDING DOOR FRAME PROVIDING A DOORWAY AND HAVING A HEADER, AND A TRACK-GUIDED DOOR FOR OPENING AND CLOSING THE DOORWAY AND WHEN IN CLOSED POSITION BEING VERTICALLY DISPOSED WITH THE UPPER MARGINAL PORTION OF THE DOOR LAPPING THE INNER SIDE OF THE HEADER, OF A FIRST RETAINER FITTING RIGIDLY SECURED TO THE INNER SIDE OF THE HEADER AT AN INTERMEDIATE POINT OF THE WIDTH OF THE DOORWAY AND HAVING A PORTION PROJECTING INWARDLY FROM THE HEADER AND PROVIDED WITH AN UPWARDLY OPENING SLOT EXTENDING DOWNWARDLY IN SAID PROJECTING PORTION, SAID PROJECTING PORTION HAVING CAM SURFACES ALONG OPPOSITE SIDES OF SAID SLOT SLOPING DOWNWARDLY AND FORWARDLY AND FACING THE HEADER, A SECOND RETAINER FITTING INCLUDING AN ARM PIVOTALLY SECURED TO THE TOP PORTION OF THE DOOR AND SWINGABLE THROUGH A LIMITED ANGLE IN A VERTICAL PLANE NORMAL TO THE DOOR, SAID ARM PROJECTING UPWARDLY AND FORWARDLY FROM ITS PIVOTAL AXIS AND ADAPTED TO MOVE IN SAID SLOT WHEN THE DOOR IS AT THE LOWER PORTION OF ITS TRAVEL, AND A HEAD ON THE FREE END PORTION OF SAID ARM ENGAGEABLE WITH SAID CAM SURFACES WITH A CAMMING ACTION AS THE DOOR MOVES DOWNWARDLY TOWARD ITS CLOSED POSITION TO THEREBY URGE AND HOLD THE UPPER MARGINAL PORTION OF THE CLOSED DOOR AGAINST THE INNER SIDE OF THE HEADER, SAID FIRST RETAINER FITTING AND SAID HEADED ARM ENGAGING THE SAME FORMING A RELATIVELY UNYIELDING CONNECTION WHEN THE DOOR IS IN CLOSED POSITION TO PREVENT INWARD DEFLECTION OF THE UPPER PORTION OF THE CLOSED DOOR BY EXTERNAL WIND PRESSURE.