Overhead door

Claim 1

IN AN OVERHEAD DOOR CONSTRUCTION, A SUPPORTING FRAME, AN UPPER DOOR PANEL HINGED ALONG ITS UPPER EDGE TO SAID SUPPORTING FRAME, A LOWER DOOR PANEL HINGED ALONG ITS UPPER EDGE TO THE LOWER EDGE OF SAID UPPER DOOR PANEL, SAID DOOR PANEL PRESENTING INNER AND OUTER SURFACES, AND THE HINGED CONNECTION BETWEEN THE DOOR PANELS BEING DISPOSED ON THE OUTER SIDE OF SAID PANELS, BRACKET EARS PROJECTING INWARDLY FROM THE INNER SIDES OF SAID LOWER DOOR PANELS AND EXTENDING LATERALLY BEYOND THE SIDE OF SAID PANELS, PIVOT PINS, AN ELONGATED GUIDE ARM AT EACH SIDE EDGE OF SAID SUPPORTING FRAME AND PIVOTALLY SECURED AT ONE END BY A PIVOT PIN TO THE ADJACENT SIDE EDGE, A SECOND SET OF PIVOT PINS EXTENDING THROUGH SAID BRACKET EARS AND THE OTHER ENDS OF THE GUIDE ARMS FOR PIVOTALLY CONNECTING THE LATTER TO SAID LOWER DOOR PANEL, SAID FIRST NAMED ENDS OF SAID GUIDE ARMS BEING SLOTTED WHERE SAID FIRST-NAMED PIVOT PINS ENGAGE THEREWITH FOR LOST MOTION CONNECTION THEREBETWEEN, AND A TENSION SPRING CONNECTED TO EACH ONE OF SAID SECOND PIVOT PINS AND EXTENDING THEREFROM TO POINTS OF CONNECTION WITH THE TOP OF SAID SUPPORTING FRAME, SAID GUIDE ARMS MOVING OVER A DEAD CENTER POSITION AS SAID DOOR IS MOVED FROM A CLOSED TO AN OPEN POSITION, SAID SPRING BEING SO POSITIONED AND THE DOOR CONSTRUCTION BEING CONSTRUCTED AND ARRANGED SO THAT SAID SPRINGS COUNTERBALANCE THE WEIGHT OF SAID DOOR PANELS AND LIFT UPWARDLY THEREON AT ALL TIMES.