Adjustable center hung door pivot

Claim 1

IN A CENTER HUNG DOOR PIVOT FOR USE IN A DOORWAY WITH A DOOR HAVING A HOLLOW LOWER PORTION, THE COMBINATION OF; A PIVOT PIN FOR MOUNTING AT THE BASE OF THE DOORWAY, A HOUSING FOR MOUNTING WITHIN THE HOLLOW PORTION OF THE DOOR OPPOSITE THE MOUNTING OF SAID PIVOT PIN, A SLIDE BAR SUPPORTED IN SAID HOUSING AND MOVABLE HORIZONTALLY IN THE DIRECTION OF THE WIDTH OF THE DOOR, A SCREW ELEMENT INTERCONNECTING SAID SLIDE BAR AND SAID HOUSING AND OPERABLE FROM THE DOOR EDGE FOR ADJUSTABLY MOVING SAID SLIDE BAR IN SAID DIRECTION, SAID SLIDE BAR HAVING AN INCLINED SURFACE EXTENDING GENERALLY AT AN ANGLE TO THE HORIZONTAL, A BEARING MEANS ROTATABLY ENGAGING SAID PIVOT PIN AND HAVING AN INCLINED SURFACE FOR MATING WITH SAID INCLINED SURFACE ON SAID SLIDE BAR FOR CAUSING RELATIVE VERTICAL MOVEMENT BETWEEN SAID PIVOT PIN AND HOUSING UPON OPERATION OF SAID SCREW ELEMENT TO ADJUST THE VERTICAL POSITION OF THE DOOR, AND INTERENGAGING MEANS ON SAID BEARING MEANS AND SAID SLIDE BAR FOR PREVENTING RELATIVE ROTATION THEREBETWEEN.