Light directing duct

Abstract

A light directing duct includes a first end portion ( 2 ) and a second end portion ( 4 ), the first end portion ( 2 ) and second end portion ( 4 ) being interconnected by a hinge ( 30 ).

1 . A light directing duct comprising a first end portion and a second end portion, the first end portion and second end portion being interconnected by a hinge.  
   
   
       2 . A light directing duct as claimed in  claim 1 , wherein the hinge is provided across one side only of the duct.  
   
   
       3 . A light directing duct as claimed in  claim 2 , wherein the second end portion comprises a tongue which extends into the first end portion.  
   
   
       4 . A light directing duct as claimed in  claim 3 , wherein the tongue extends into the first end portion on a side of the duct opposite to the hinge.  
   
   
       5 . A light directing duct as claimed in  claim 3 , wherein the tongue is flexible so that it can bend as the first end portion of the duct is rotated relative to the second end portion.  
   
   
       6 . A light directing duct as claimed in  claim 5 , wherein the two sides of one of the end portions adjacent to the side of the duct with the hinge comprise projections having curved guide surfaces along which the other end portion tracks.  
   
   
       7 . A light directing duct as claimed in  claim 1 , wherein the internal surfaces of the duct are adapted to reflect light.  
   
   
       8 . A light directing duct as claimed in  claim 1 , wherein the duct has a rectangular cross-section.  
   
   
       9 . A light directing duct as claimed in  claim 8 , wherein the duct has a square cross section.  
   
   
       10 . A light directing duct as claimed in  claim 1 , wherein the duct is adapted for use between a skylight and a room of a building.  
   
   
       11 . A light directing duct as claimed in  claim 1 , wherein the hinge comprises a living hinge.  
   
   
       12 . A light directing duct as claimed in  claim 11 , wherein the living hinge is formed from flexible material attached to a wall of the duct.