Extensible sectional sash assembly

Claim 1

A SECTIONAL SASH STRUCTURE ADAPTED TO BE INSTALLED IN AN OPENING OF A DOOR OR THE LIKE TO PROVIDE A MOUNTING FOR A GLAZED WINDOW THEREIN, SAID OPENING BEING DELINEATED BY A FRAMING MEMBER INCLUDING MOUNTING APERTURES, SAID SASH STRUCTURE COMPRISING, A SASH BAR ADAPTED TO BE IN STALLED IN A POSITION SPANNING SAID OPENING, SAID SASH BAR BEING OF HOLLOW CROSS SECTION, A PAIR OF TENONS SLIDABLY MOUNTED IN THE END PORTIONS OF SAID HOLLOW SASH BAR, A LOCKING SCREW THREADED THROUGH EACH OF SAID TENONS, SAID SASH BAR BEING SLOTTED LONGITUDINALLY, EACH LOCKING SCREW HAVING A SHANK PORTION PROJECTING OUTWARDLY THROUGH SAID SLOT AND HAVING A HEAD PORTION RESIDING WITHIN THE HOLLOW SASH BAR AND ADAPTED TO ENGAGE THE SASH BAR ON OPPOSITE SIDES OF SAID SLOT, EACH LOCKING SCREW HAVING TOOL-ENGAGING MEANS ON THE SHANK PORTION OPPOSITE THE HEAD PORTION PROVIDING ENGAGEMENT WITH A TOOL FOR TIGHTENING THE SCREW, SAID TOOL-ENGAGING MEANS BEING PRESENTED OUTWARDLY THROUGH SAID SLOT, WHEREBY A TOOL IS ADAPTED TO BE ENGAGED WITH SAID TOOL-ENGAGING MEANS FOR TIGHTENING THE SCREW, THEREBY TO SECURE THE TENON IN AN ADJUSTED POSITION RELATIVE TO THE SASH BAR, SAID SASH BAR BEING INSTALLED WITHIN SAID OPENING IN ALIGNMENT WITH THE APERTURES OF SAID FRAMING MEMBER AND WITH SAID TENONS SHIFTED OUTWARDLY THROUGH SAID APERTURES AND LOCKED RELATIVE TO THE SASH BAR BY SAID LOCKING SCREWS, THEREBY ANCHORING THE SASH BAR IN PLACE WITHIN SAID OPENING.