Elongated hollow member for suspending objects

Abstract

An elongated hollow member for suspending objects is formed of two first walls ( 1 ) running parallel to each other in the elongated direction (L) and two second walls ( 2 ) disposed perpendicularly to the first walls ( 1 ) and running in the elongated direction (L) with a wall thickness (w). The second walls ( 2 ) and the first walls ( 1 ) form a substantially rectangular cross-section having transverse widths (h) and (b). In order to assure economical manufacturing of the hollow member with a high torsional rigidity, the member has at least one elongated web ( 5 ) running in the plane of at least one second wall ( 2 ) and extending in the elongated direction (L) and perpendicular to the first wall ( 1 ) and extending outwardly beyond the corresponding first wall ( 1 ).

What is claimed is:  
     
         1 . An elongated hollow member for suspending objects comprising a pair of first walls ( 1 ) extending in the elongated direction and in laterally spaced parallel relation and a pair of second walls ( 2 ) arranged perpendicularly to said first walls ( 1 ) and extending in the elongated direction and in laterally spaced parallel relation, each said second walls ( 2 ) having a width (b) transverse to the elongated direction and a wall thickness (w), said first walls ( 1 ) and second walls ( 2 ) form a substantially rectangular cross-sectional space ( 6 ), said hollow member has at least one web ( 5 ) extending in the elongated direction projecting outwardly from one of said first walls by a dimension (c) and located in a plane of at least one said second wall ( 2 ).  
     
     
         2 . An elongated hollow member, as set forth in  claim 1 , where said web ( 5 ) is formed of a material forming said first and second walls ( 2 ) folded over upon itself and forming a fold open to said space ( 6 ).  
     
     
         3 . An elongated hollow member, as set forth in  claim 2 , wherein each of said pairs of second walls have at least one said elongated web ( 5 ) arranged opposite to one another.  
     
     
         4 . An elongated hollow member, as set forth in  claim 3 , wherein said elongated webs ( 5 ) disposed opposite to one another are parallel to one another and spaced apart by a dimension (a).  
     
     
         5 . An elongated hollow member, as set forth in  claim 4 , wherein the dimension (a) corresponds approximately to the width (b) and double a width (c) of said web projecting outwardly from said first wall ( 1 ).  
     
     
         6 . An elongated hollow member, as set forth in  claim 5 , wherein the dimension (d) of the web ( 5 ) measured in a plane of said first walls is in a range of two times to six times the wall thickness (w) of said second wall ( 2 ).  
     
     
         7 . An elongated hollow member, as set forth in  claim 6 , wherein said second walls ( 2 ) have a plurality of openings ( 7 ) therethrough.  
     
     
         8 . An elongated hollow member, as set forth in  claim 7 , wherein said first walls ( 1 ) each have a plurality of openings ( 7 ) therethrough.  
     
     
         9 . An elongated hollow member, as set forth in  claim 8 , wherein at least one said first wall has one of a bead or corrugation ( 8 ) extending in the elongated direction.  
     
     
         10 . An elongated hollow member, as set forth in  claim 9 , wherein at least one said second wall has one of a bead or corrugation ( 8 ) extending in the elongated direction.  
     
     
         11 . An elongated hollow member, as set forth in  claim 10 , wherein said one bead or corrugation ( 8 ) is formed by an inwardly recessed portion of said first and second walls ( 1 ,  2 ).  
     
     
         12 . An elongated hollow member, as set forth in  claim 11 , where said bead or corrugation has a dimension (hs) extending transversely of the elongated direction.  
     
     
         13 . An elongated hollow member, as set forth in  claim 2 , wherein one said web is located at each corner of said space ( 6 ).