SYSTEM AND METHOD FOR JOINING AND HANGING DUCTS
A fastening member for joining together adjacent duct sections includes a head and a shank extending from the head, the shank having an unthreaded space adjacent to the head and a threaded portion extending from the unthreaded space, the threaded portion threadedly engaging a hole of an inserted corner plate positioned in flange of a first duct section. When the fastening member is fully inserted, the inserted corner plate positioned in the flange of the first duct section is retained within the unthreaded space.
1 . A corner flange connection member configured for joining together adjacent duct channel flanges associated with duct sections, said corner flange connection member comprising:
two leg portions joined together in angular relationship by a corner portion; and at least one opening in said corner portion for receiving at least one fastening member for connecting said corner flange connection member to the duct sections;
wherein said at least one opening is shaped so as to threadably receive the fastening member without cutting threads.
2 . The corner flange connection member of claim 1 , wherein:
said at least one opening has one of a teardrop shape, a diamond shape with contoured corners at two opposing corners of the opening, an eye shape, a rectangular shape, or a half-diamond shape on one end and a curved shape on an opposite end.
3 . The corner flange connection member of claim 1 , wherein:
said at least one opening has a teardrop shape.
4 . The corner flange connection member of claim 1 , wherein:
said fastening member and said at least one opening are configured to threadedly engage in a manner wherein the fastening member is tilted at a small acute angle relative to a substantially perpendicular orientation, and such that the fastening member will automatically transition to the substantially perpendicular orientation when fully received through said at least one opening.
5 . The corner flange connection member of claim 1 , wherein:
said opening is a clearance opening having a diameter greater than the diameter of a threaded portion of the fastening member positioned therethrough.
6 . The corner flange connection member of claim 1 , wherein:
said fastening member has a threaded portion having threads having a pitch that is about equal to a thickness of the corner flange connection member measured through the opening, and the opening is shaped such that the fastening member can be tilted at a small approach angle relative to the corner flange connection member, to engage the thread with the corner flange connection member such that the threads of the fastening member can pass through the opening of the corner flange connection member without the corner flange connection member itself being pre-threaded or the thread of the fastening member forceably cutting a new thread or otherwise deforming a surface of the corner flange connection member adjacent or about the opening.
7 . The system of claim 6 , wherein:
the holes in the inserted corner plates are shaped so as to threadably receive the threads of the screw without threads; and
wherein the holes in the inserted corner plates are devoid of threads.