Knock-down door buck construction with adjustable wall clamping means

Claim 1

IN A METAL PREFORMED DOOR BUCK CONSTRUCTION FOR INSTALLING IN A DOORWAY CUT IN A WALL, A PAIR OF CHANNELSHAPED JAMBS EACH INTEGRALLY FORMED WITH OPPOSITE SIDE WALLS FOR EXTENDING OVER VERTICAL EDGES OF A WALL BORDERING SAID DOORWAY, FLANGES INWARDLY BENT TOWARD EACH OTHER EXTENDING FROM SAID OPPOSITE SIDE WALLS FOR CLAMPINGLY CONTACTING OPPOSITE SIDES OF SAID WALL, ADJUSTABLE CONSTRICTING MEANS COACTING WITH SAID SIDE WALLS TO FLEX THE LATTER AND BRING SAID FLANGES TOWARD EACH OTHER TO EFFECT SAID CLAMPING CONTACT, EACH JAMB HAVING A JAMB PORTION FROM WHICH SAID OPPOSITE SIDE WALLS INTEGRALLY EXTEND, SAID JAMB PORTION BEING INTEGRALLY FORMED WITH A DOOR STOP PORTION EXTENDING LONGITUDINALLY ALONG A MIDPORTION THEREOF HAVING OPPOSITE PROJECTING WALLS AND AN INTERCONNECTING TRANSVERSE WALL DEFINING AN INTERIOR CHANNEL, SAID ADJUSTABLE CONSTRICTING MEANS INCLUDING A PLURALITY OF PAIRS OF TENSION PLATES, EACH PAIR BEING SPACED FROM EACH OTHER ALONG THE INTERIOR OF EACH JAMB, EACH PLATE OF THE PAIR BEING CONNECTED AT ONE END TO ONE OF SAID FLANGES AND HAVING AN OPPOSITE END SECTION LOCATED IN SAID INTERIOR CHANNEL IN SPACED FACE TO FACE ALIGNMENT, MEANS ADJUSTABLY INTERCONNECTING SAID OPPOSITE END SECTIONS FOR MOVEMENT TOWARD EACH OTHER TO EFFECT SAID CLAMPING CONTACT, EACH OF THE TENSION PLATES IN SAID PAIRS BEING BENT TO CONFORM SUBSTANTIALLY TO THE INTERIOR CONTOUR OF THE JAMB, AND GUIDE MEANS CARRIED ON THE INTERIOR OF SAID TRANSVERSE WALL FORMING TRACKS FOR ENGAGEMENT BY A PORTION OF EACH TENSION PLATE FOR RETAINING SAID PLATES IN POSITION WHEN TENSION IS APPLIED THEREBETWEEN EXERTING SAID CLAMPING.