Suspended ceiling construction

Claim 1

IN A SUSPENDED CEILING CONSTRUCTION WHICH INCLUDES A PARALLEL PAIR OF BEAMS SUPPORTED IN A COMMON HORIZONTAL PLANE, EACH OF SAID BEAMS HAVING A PAIR OF OUTWARDLY EXTENDING HORIZONTAL FLANGES FORMED ON ITS LOWER LONGITUDINAL EDGE, AND WHICH FURTHER INCLUDES FIRST AND SECOND PLURALITIES OF RECTANGULAR CEILING TILES DISPOSED IN END-TO-END ARRAY BETWEEN SAID BEAMS SO AS TO LEAVE A SPACED BETWEEN SAID FIRST AND SECOND PLURALITIES OF TILES, AND SUPPORTED FROM AND IN REMOVABLE ENGAGEMENT WITH THE IMMEDIATELY ADJACENT FLANGE OF EACH OF SAID BEAMS, AND EASILY MOVABLE LIGHT FIXTURE ARRANGEMENT OCCUPYING SAID SPACE, COMPRISING, IN COMBINATION: A METAL CAN ADAPTED TO CONTAIN AND SUPPORT AT LEAST ONE FLUORESCENT LIGHT BULB; SPRING LATCH MEANS RELEASABLY COUPLING SAID CAN TO THE UPPER EXTREMITIES OF SAID BEAMS; A RIGID RECTANGULAR FRAME INCLUDING A PAIR OF SIDE MEMBERS AND A PAIR OF END MEMBERS, THE MEMBERS OF ONE OF SAID PAIRS ENGAGING THE IMMEDIATELY ADJACENT FLANGES OF SAID BEAMS AND BEING REMOVABLY ATTACHED THERETO, THE MEMBERS OF THE OTHER OF SAID PAIRS ENGAGING THE END TILE OF SAID FIRST AND SECOND PLURALITIES OF TILES, RESPECTIVELY; A SUBSTANTIALLY RECTANGULAR LIGHT-TRANSMISSIVE PLATE DISPOSED WITHIN SAID FRAME; AND SPRING MEANS RELEASABLY RETAINING SAID PLATE WITHIN SAID FRAME.