Framed diffuser plate for a lighting fixture

Claim 1

A FRAMED CLOSURE FOR A LIGHTING FIXTURE COMPRISING A RECTILINEAR DIFFUSER PLATE; FRAME MEMBERS CORRESPONDING IN LENGTHS TO THE STRAIGHT LINE EDGES OF SAID DIFFUSER PLATE, AND ENCLOSING SAID PLATE, EACH OF SAID FRAME MEMBERS HAVING A LOWER INWARDLY FACING GROOVE ENGAGING THE EDGES OF SAID PLATE AND HAVING AN UPPER OUTWARDLY FACING GROOVE ADAPTED TO ENGAGE THE HOLDING TABS OF CORNER CLIPS; CORNER CLIPS FASTENED OVER THE RIMS OF ADJACENT END PORTIONS OF SAID FRAME MEMBERS, EACH OF SAID CLIPS CONSISTING OF TWO ANGULARLY DISPOSED CHANNEL-SHAPED SHEET METAL MEMBERS HELD TOGETHER BY THE CONNECTING METAL SIDE STRIP WHICH FORMS THE INNER SIDE OF SAID CHANNEL MEMBERS, THE OUTER SIDE STRIP OF SAID CHANNEL MEMBERS HAVING SPRING HOLDING TABS ENGAGED IN SAID UPPER GROOVES OF SAID FRAME MEMBERS; AND PIVOT MEMBERS ATTACHED TO ADJACENT CORNER CLIPS AND EXTENDING OUTWARRDLY THEREFROM, SAID PIVOT MEMBERS INCLUDING A PIVOT PIN IN A PAIR OF LEGS DISPOSED ANGULARLY AND EACH LEG BEING ENGAGED BETWEEN SAID FRAME MEMBERS AND ONE OF SAID ANGULARLY DISPOSED CHANNEL MEMBERS OF SAID CORNER CLIPS.