Patent ID: 8844578
Filing Date: 2014-09-30
Classification: F16L,F24F,Y10T

Abstract:
1. An air duct system that includes a tubular pliable sidewall and an end cap that when connected define an interior volume of the air duct system, the end cap comprising: an end piece defining a central point and an outer periphery that is substantially fixed relative to the central point; a pliable sheet spanning the end piece and having an outer peripheral portion overlying the outer periphery of the end piece; a fastener attached to the pliable sheet and being connectable to the tubular pliable sidewall; an extension extending from the outer peripheral portion of the pliable sheet; and a constricting member connected to the extension, the constricting member having a tight state and a loose state, the pliable sheet being more taut when the constricting member is in the tight state than when the constricting member is in the loose state, and the extension being closer to the central point of the end piece when the constricting member is in the tight state than when the constricting member is in the loose state.