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US 6,585,293 B2Granted
Low permeability airbag and method
AssigneeMilliken & Company
InventorRamesh Keshavaraj
Life of this patent
Estimating the term…
Abstract
An airbag having low gas permeability characteristics. The airbag is formed from two separate layers of material, an inner layer having low air permeability and an outer strength layer enclosing the inner layer, where the layers are only attached together along seam lines. The inner layer is made from a film material, preferably urethane. The outer layer is formed from a fabric.
Claims8
An airbag cushion comprising:
- a substantially enclosed inner bag made of a first material and including at least one seam where opposed portions of said first material are attached together by forming a polymeric bead therebetween to form a substantially enclosed bag;
- and
- an outer bag made of second material, said outer bag being attached to and enclosing said inner bag wherein said outer bag is sewn to said inner bag within the boundaries of said seam on said inner bag.
A method for manufacturing a multi-layer airbag cushion, said method comprising the steps of:
- providing an inner layer of material, said inner layer formed into a shape having a pocket for receiving and retaining gas under pressure;
- providing an outer layer of material;
- heat welding said inner layer to form chambers on an interior portion of said inner layer and
- disposing said inner layer within said outer layer;
- enclosing said outer layer about said inner layer;
- and
- attaching said outer layer to said inner layer.
4 more elements
Dependencies are inferred from the claim text.