Method of folding a gas bag for a vehicle occupant restraint system and folded gas bag

Abstract

A method of folding a gas bag for a vehicle occupant restraint system comprises the following steps: first, the gas bag is unfolded between a base and an opposing surface. A spacing is provided between the base and the opposing surface, which corresponds to a height of a housing into which the gas bag is to be inserted after folding. Then, a folding funnel is provided which comprises one end having a large cross-section and one end having a small cross-section, the large cross-section being larger than or equal to a cross-section of the gas bag when unfolded between the base and the opposing surface, and the small cross-section corresponding to a cross-section of the housing; beginning with its large cross-section. Finally, the folding funnel is placed over the unfolded gas bag and moved relative thereto such that the gas bag is pushed together on the base by the folding funnel to the small cross-section.

1 . A method of folding a gas bag for a vehicle occupant restraint system, said method comprising the following steps: 
 said gas bag is unfolded between a base and an opposing surface, wherein a spacing is provided between said base and said opposing surface, said spacing corresponding to a height of a housing into which said gas bag is to be inserted after folding;    a folding funnel is provided which comprises one end having a large cross-section and one end having a small cross-section, said large cross-section being larger than or equal to a cross-section of said gas bag when unfolded between said base and said opposing surface, and said small cross-section corresponding to a cross-section of said housing;    beginning with its large cross-section, said folding funnel is placed over said unfolded gas bag and moved relative thereto such that said gas bag is pushed together on said base by said folding funnel to said small cross-section.    
     
     
         2 . The method as set forth in  claim 1 , wherein said opposing surface has a shape corresponding to a cross-sectional shape of said housing.  
     
     
         3 . The method as set forth in  claim 1 , wherein said base comprises a middle section, the shape of which corresponds to said cross-sectional shape of said housing.  
     
     
         4 . The method as set forth in  claim 1 , wherein said base is formed by a bottom consisting of several segments that are removed corresponding to a reduction in said cross-section of said folding funnel.  
     
     
         5 . The method as set forth in  claim 1 , wherein said base is formed on a coil spring which is pushed together corresponding to a reduction in said cross-section of said folding funnel.  
     
     
         6 . The method as set forth in  claim 1 , wherein said base is formed by a surface of a liquid.  
     
     
         7 . The method as set forth in  claim 1 , wherein said base is provided with slots extending up to a middle section.  
     
     
         8 . The method as set forth  claim 1 , wherein said folding funnel is continuously tapered, starting from its large cross-section.  
     
     
         9 . The method as set forth in  claim 1 , wherein said folding funnel is tapered step-wise, starting from its large cross-section.  
     
     
         10 . The method as set forth  claim 1 , wherein said folding funnel comprises a closed wall.  
     
     
         11 . The method as set forth in  claim 1 , wherein said folding funnel is formed by a plurality of juxtaposed rods.  
     
     
         12 . The method as set forth in  claim 1 , wherein said folding funnel is formed by a plurality of juxtaposed wall segments between which a gap is provided.  
     
     
         13 . The method as set forth  claim 1 , wherein said gas bag has a wall and is surrounded by a packing envelope extending between said wall and said folding funnel.  
     
     
         14 . A folded gas bag for a vehicle occupant restraint system, said gas being folded by means of a method comprising the following steps: said gas bag is unfolded between a base and an opposing surface, wherein a spacing is provided between said base and said opposing surface, said spacing corresponding to a height of a housing into which said gas bag is to be inserted after folding; a folding funnel is provided which comprises one end having a large cross-section and one end having a small cross-section, said large cross-section being larger than or equal to a cross-section of said gas bag when unfolded between said base and said opposing surface, and said small cross-section corresponding to a cross-section of said housing; beginning with its large cross-section, said folding funnel is placed over said unfolded gas bag and moved relative thereto such that said gas bag is pushed together on said base by said folding funnel to said small cross-section, 
 said gas bag comprising a wall with a multitude of chaotically oriented single folds and an upper, substantially flat outer side and a lower, substantially flat outer side, wherein the improvement comprises that more single folds are provided in one of said outer sides than in the respective other outer side.    
     
     
         15 . The folded gas bag as set forth in  claim 14 , wherein in a region of one of said outer sides, irrespective of said single folds, said wall is configured to be more straight than at the respective other outer side.