Patent attributes
A corner flange connection member for joining flanges of duct sections, includes two leg portions joined together in an angular relationship by a corner portion, the connection member being substantially flat and including at least one opening for receiving a fastening member having a threaded portion, the threaded portion having a root diameter, the opening being defined by two joined and offset partially rounded openings, at least one of the offset partially rounded openings having a sectional extent between opposite sides thereof about equal to the root diameter of the threaded portion of the fastening member, the offset being about equal to a thread height of threads of the threaded portion of the fastening member, and the sides of the offset openings being joined generally tangentially. The opening or openings can be located in the corner portion or one or both of the leg portions.
