US Patent 7107734 Audience seating system

An interface for connecting supporting members of an audience seating system including an end plate secured to the first end of a horizontal member. The end plate includes a downwardly extending tongue and outwardly extending tabs and a hook member extending outwardly and downwardly. The upper end of the vertical member has a recess dimensioned to receive the hook member and a hanger bracket defining a space for receiving the tongue and openings for receiving the tabs. The horizontal member may be engaged to the vertical member by lowering the hook member into the recess, the tongue into the space and the tabs into the openings to create a substantially rigid engagement secured by gravity.