Sash construction for a sliding window

Claim 1

THE COMBINATION COMPRISING A VERTICALLY SLIDABLE WINDOW SASH INCLUDING SPACED APART PARALLEL STILES JOINED TOGETHER AT THEIR TOP AND BOTTOM ENDS BY, RESPECTIVELY, A TOP RAIL AND A BOTTOM RAIL; THE STILES AND TOP RAIL BEING CHANNEL SECTIONS HAVING SPACED APART WALLS JOINED TOGETHER BY A WEB; A HOLLOW TONGUE PROJECTING FROM EACH OF SAID WEBS AND EXTENDING LONGITUDINALLY OF ITS RESPECTIVE STILE AND TOP RAIL; A PAIR OF CORNER BRACKETS PROVIDED TO JOIN THE TOP RAIL TO THE STILES; EACH OF SAID CORNER BRACKETS COMPRISING AN L-SHAPED MEMBER HAVING ONE LEG RECEIVED IN, AND SECURED TO, THE PORTION OF THE STILE TONGUE ADJACENT TO AN END THEREOF AND A SECOND LEG RECEIVED IN, AND SECURED TO, THE END PORTION OF THE STILE TONGUE ADJACENT THERETO; EACH OF SAID LEGS HAVING A TAB AT ITS OUTER END AND SPACED THEREFROM BY A WALL PORTION TO A POSITION ADJACENT ONE WALL OF, RESPECTIVELY THE TOP RAIL AND STILE; EACH OF THE TABS HAVING AN OPENING THERETHROUGH; THE AFORESAID ADJACENT WALLS OF THE TOP RAIL AND STILE EACH HAVING AN OPENING IN REGISTRY WITH THE RESPECTIVE OPENINGS IN THE TABS; A PAIR OF LOCKS EACH HAVING OPENINGS IN REGISTRY WITH A PAIR OF THE TOP RAIL AND STILE OPENINGS; AND THREADED FASTENING MEANS EXTENDING THROUGH THE LOCK OPENINGS AND THREADINGLY ENGAGING THE TAB OPENINGS TO THEREBY SECURE EACH LOCK TO THE SASH.