Method of manufacturing cushion for front passenger seat air bag device

Abstract

A cushion of a passenger airbag device that is reduced in volume and shows a stable behavior when inflated and deployed is achieved. The present invention is a method of producing a cushion ( 10 ) of a passenger airbag device ( 1 ) having a portion with a desired curvature by sewing side edges of base fabric pieces constituting a main panel ( 12 ) and left and right side panels ( 14 ) together. The main panel ( 12 ) and the side panels ( 14 ) are sewn together so as to form a rectangular opening, whose short sides have a length equal to the width of the side panels ( 14 ) and whose long sides have a length equal to the width of the main panel ( 12 ), at a position where stitches in the main panel ( 12 ) and side panels ( 14 ) start or end. Then, the portion with a desired curvature is formed by folding the short sides toward the opening and sewing the short sides and the long sides together.

1 . A method of producing a cushion of a passenger airbag device having a portion with a desired curvature by sewing side edges of base fabric pieces constituting a main panel and left and right side panels, the method comprising:
 a step of sewing the main panel and the side panels together so as to form a rectangular opening, whose short sides have a length equal to the width of the side panels and whose long sides have a length equal to the width of the main panel, at a position where stitches in the main panel and side panels start or end; and   a step of forming the portion with a desired curvature by folding the short sides toward the opening and sewing the short sides and the long sides together.   
     
     
         2 . The method of producing a cushion of a passenger airbag device according to  claim 1 ,
 wherein the cushion has, on an instrument panel side thereof in an inflated and deployed state, a projecting portion that functions as support means when an occupant moves forward therein, and   wherein the portion with a desired curvature is the projecting portion.   
     
     
         3 . The method of producing a cushion of a passenger airbag device according to  claim 1 ,
 wherein the cushion, in an inflated and deployed state, has a shape corresponding to a space between a windshield and a top surface of the instrument panel so as to fill the space, and   wherein the portion with a desired curvature is the portion having a shape corresponding to the space.