Patent ID: 8151722
Filing Date: 2012-04-10
Classification: B60R

Abstract:
1. A method of manufacturing an airbag inflated by a expelled gas of an inflator arranged at a base end side in a direction in which a distal end side is separated from the base end side, the airbag having: a left airbag section inflated on the left side in front of an occupant; a right airbag section inflated on the right side in front of the occupant; and a base end chamber with which sides opposite the occupant of the left airbag section and the right airbag section communicate, wherein an opening is provided in each of opposing faces of the left airbag section and right airbag section, respectively, edge portions of each of the openings are sewn together, and the left airbag section and the right airbag section communicate with each other through the openings, the airbag being constituted by: a single inside panel constituting the opposing face of the left airbag section and the opposing face of the right airbag section; and a single outside panel constituting a left side face of the left airbag section, an occupant opposite face of the airbag, and a right side face of the right airbag section sewn together, the method of manufacturing the airbag comprising steps of: overlapping the inside panel and the outside panel in a double-folded state so that a left-side opposing face constituting portion constituting the opposing face of the left airbag section and a right-side opposing face constituting portion constituting the opposing face of the right airbag section in the inside panel are overlapped with each other such that airbag inner side faces thereof oppose each other, a left-side face constituting portion constituting the left side face of the left airbag section in the outside panel and the left-side opposing face constituting portion of the inside panel are overlapped with each other such that airbag outer side faces thereof oppose each other, and a right-side face constituting portion constituting the right side face of the right airbag section in the outside panel and the right-side opposing face constituting portion of the inside panel are overlapped with each other such that the airbag outer side faces of them oppose each other; main sewing of sewing peripheral edge portions of a part of the peripheral edge portions of the outside panel along the base end chamber together and sewing the peripheral edge portions of the inside panel and the outside panel together; sewing an opening peripheral edge portion at the beginning, in the middle or after the main sewing process, in which the inside panel is reversed at least partially so that at least the peripheral edge portion of the opening of the left-side opposing face constituting portion of the inside panel and the peripheral edge portion of the opening of the right-side opposing face constituting portion are overlapped with each other such that the airbag outer side faces thereof oppose each other and then, the peripheral edge portions of the openings are sewn together; reversing the outside panel and the inside panel through an unsewn portion made up of a remaining portion along the base end chamber in the peripheral edge portion of the outside panel after that; and sealing and sewing to seal the unsewn portion by sewing.