Base anchor for sectional metal door frames

Claim 1

A BASE ANCHOR STRUCTURE SECURING THE LOWER END PORTIONS OF THE VERTICAL JAMBS OF A SECTIONAL DOOR FRAME RELATIVE TO THE FLOOR OF A BUILDING TO DELINEATE A DOOR OPENING IN A WALL STRUCTURE, SAID DOOR FRAME BEING OF SECTIONAL CONSTRUCTION AND HAVING A HORIZONTAL HEADER, A PAIR OF VERTICAL JAMBS, AND COACTING ELEMENTS INTERCONNECTING THE OPPOSITE ENDS OF THE HEADER TO THE UPPER ENDS OF THE JAMBS, SAID BASE ANCHOR STRUCTURE COMPRISING: A RUNNER STRIP SECURED TO THE FLOOR OF THE BUILDING AND DELINEATING THE WALL TO BE ERECTED, SAID RUNNER STRIP BEING INTERRUPTED TO PROVIDE A DOOR OPENING CORRESPONDING GENERALLY TO THE LOCATION OF THE SECTIONAL DOOR FRAME; SAID RUNNER STRIP BEING FORMED OF SHEET METAL TO PROVIDE A LONGITUDINAL CORRUGATION HAVING A BOTTOM PLATE AND HAVING SIDE WALLS WHICH CONVERGE UPWARDLY TOWARD ONE ANOTHER TO PROVIDE A DOVETAIL SLIDEWAY EXTENDING LONGITUDINALLY OF THE RUNNER STRIP; SAID RUNNER STRIP INCLUDING VERTICAL WALLS PROJECTING UPWARDLY ABOVE SAID DOVETAIL SECTION AND EXTENDING LONGITUDINALLY OF THE RUNNER STRIP; A PAIR OF BASE ANCHORS; A MOUNTING PLATE ON EACH BASE ANCHOR SEATED UPON THE VERTICAL WALLS OF THE RUNNER STRIP; SAID BASE ANCHORS CONNECTED TO THE END PORTIONS OF SAID RUNNER STRIP ON OPPOSITE SIDES OF THE DOOR OPENING I THEREOF; THE MOUNTING PLATE OF EACH OF SAID BASE ANCHORS BEING PROVIDED WITH DOWNWARDLY PROJECTING FLANGES ALONG OPPOSITE LONGITUDINAL EDGES, SAID FLANGES OF THE BASE ANCHOR OVERHANGING THE SAID VERTICAL SIDE WALLS OF THE RUNNER STRIP AT OPPOSITE SIDES, THEREBY TO LOCATE THE MOUNTING PLATE OF THE BASE ANCHOR FOR LONGITUDINAL ADJUSTMENT OF THE BASE ANCHOR ALONG THE RUNNER STRIP; RESPECTIVE CLAMPING NUTS SLIDABLY CONFINED IN SAID DOVETAIL SLIDEWAY, ONE FOR EACH OF SAID BASE ANCHORS; CLAMPING SCREWS PASSING THROUGH SAID MOUNTING PLATES OF THE BASE ANCHOR AND INTO THREADED ENGAGEMENT WITH SAID CLAMPING NUTS, AND CLAMPING EACH BASE ANCHOR PERMANENTLY IN ADJUSTED POSITION WITH RESPECT TO THE RUNNER STRIP, FLANGES PROJECTING UPWARDLY FROM BOTH OF SAID BASE ANCHORS, AND ATTACHMENT MEANS SECURING THE LOWER END PORTION OF SAID VERTICAL JAMBS TO THE UPWARDLY PROJECTING FLANGES OF THE BASE ANCHORS AFTER THE UPPER ENDS OF THE JAMBS HAVE BEEN INTERCONNECTED WITH THE OPPOSITE ENDS OF THE HEADER BY SAID COACTING ELEMENTS, THEREBY TO SECURE THE SECTIONAL DOOR FRAME PERMANENTLY IN ERECTED POSITION WITH RESPECT TO THE DOOR OPENING PROVIDED BY THE RUNNER STRIP.