Knock-down door buck construction with adjustable wall clamping means

Claim 1

IN A THREE-PIECE METAL PREFORMED DOOR BUCK CONSTRUCTION FOR INSTALLING IN A DOORWAY CUT IN A WALL, A PAIR OF CHANNEL-SHAPED 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 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 ADJUSTABLE MEANS INCLUDING A PLURALITY OF STRAPS SPACED FROM EACH OTHER ALONG EACH OF SAID JAMB PORTIONS, EACH STRAP HAVING AN INTERMEDIATE SECTION AND A PAIR OF OPPOSITE ARM SECTIONS, EACH INTERMEDIATE SECTION BEING SPACED FROM AND SUBSTANTIALLY PARALLEL TO THE JAMB PORTION AND HAVING OPPOSITE ENDS THEREOF FORMED IN BENDS DIVERGENTLY DISPOSING SAID ARM SECTIONS WITH RESPECT TO EACH OTHER, EACH OF SAID ARM SECTIONS HAVING AN END OPPOSITE SAID BEND ATTACHED TO ONE OF THE OPPOSITE SIDE WALLS, MEANS ADJUSTABLY INTERCONNECTING EACH INTERMEDIATE SECTION WITH THE JAMB PORTION TO VARY THE DISTANCE THEREBETWEEN, SAID STRAP BEING OTHERWISE FREE FROM CONTACT AND ENGAGEMENT WITH SAID JAMB PORTION AND OPPOSITE SIDE WALLS, SAID BENDS BEING CONSTRUCTED AND ARRANGED TO FLEX AND DECREASE THE DIVERGENCE OF SAID ARM SECTIONS UPON BRINGING THE INTERMEDIATE PORTION TOWARDS THE JAMB PORTION BY SAID INTERCONNECTING MEANS TO EFFECT SAID SIDE WALL FLEXING AND WALL CLAMPING BY SAID FLANGES.