| 摘要 |
A duct fitting in which at least one end of the fitting is provided with an attachment structured to cooperate with either the male end or the female end of a duct to be connected therewith. The fitting's attachment includes a ring immobily fixed to the fitting, and an expandable/collapsible collar adjustably connected to the ring. A bead on the ring bead and a flange on the collar cooperate to retain the collar in connected relation with the fitting so that the collar may be expanded or collapsed throughout its length as desired depending on whether the fitting is to be connected with a duct's male end or female end. The collar also incorporates rivet and slot structure that defines the inner and outer circumference limits of the collar. |
