Curtain wall frame construction

Claim 1

IN A CURTAIN WALL COMPRISING A PLURALITY OF UNITS, MEANS JOINING ADJACENT UNITS ALONG CO-EXTENSIVE EDGES COMPRISING A PAIR OF CHANNEL-SHAPED CONNECTORS, SAID CONNECTORS HAVING A BASE AND SIDES EXTENDING FROM SAID BASE, ONE OF SAID CHANNEL-SHAPED CONNECTORS BEING BASE MOUNTED ON THE PERIMETER EDGE OF ONE OF SIAD UNITS, THE OTHER OF SAID CHANNEL-SHAPED CONNECTORS BEING BASE MOUNTED ON THE PERIMETER EDGE ON THE OTHER OF SAID UNITS, EACH OF SAID CHANNEL-SHAPED CONNECTORS BEING MOUNTED AS AFORESAID WITH THEIR SIDES EXTENDING OUTWARDLY OF THE EDGE OF THE UNIT UPON WHICH IT IS MOUNTED, THE SIDES OF SAID CHANNEL-SHAPED CONNECTORS BEING IN ABUTTING RELATION, THE SIDE WALLS OF SAID CHANNEL-SHAPED CONNECTORS BEING FORMED WITH HOLES AT SPACED APART INTERVALS ALONG THEIR LENGTH AND BOLT MEANS EXTENDING THROUGH SAID HOLES TO JOIN SAID ABUTTING SIDE WALLS OF SAID CHANNELSHAPED CONNECTORS TOGETHER WHEREBY SAID CO-EXTENSIVE EDGES OF SAID PANELS ARE JOINED TO EACH OTHER, SAID BASE OF EACH OF SAID CHANNEL-SHAPED BEING BROADER THAN THE EDGE OF THE CURTAIN WALL SECTION UPON WHICH IT IS MOUNTED AND OVERHANGING THE EDGE THEREOF, THE OVERHANGING PORTIONS OF SAID CHANNEL-SHAPED CONNECTORS BEING IN OPPOSED RELATION TO FORM A MULLION PORTION, A DECORATIVE CHANNEL-SHAPED COVER FOR SAID MULLION PORTION, SECURING MEANS OPERATIVE BETWEEN THE BASE OF SAID OVERHANGING PORTIONS OF SAID CHANNEL-SHAPED CONNECTORS AND SAID CHANNEL-SHAPED COVER HOLDING SAID COVER IN POSITION ON SAID OVERHANGING PORTIONS OF SAID CHANNEL-SHAPED CONNECTORS WHEREBY TO COVER SAID CONNECTORS.