Side airbag device

A side airbag for a vehicle for providing impact restraint for an occupant adapted to be assembled with an inflator which is provided inside the airbag and deployed in a side collision, the inflator upon receiving an output signal from a sensor, supplies a gas to the airbag in a folded state, and deploys the airbag, comprising:

• a tether attached to an outer surface of the airbag on a side of the airbag that faces the occupant of the vehicle when the airbag is deployed,
• the tether is shaped such that a vertical length of a front edge of the tether is positioned at a front end of the airbag when deployed is longer than a vertical length of a rear edge of the tether which is positioned at a rear end of the airbag when deployed,
• the front edge is shaped so as to continuously extend in the vertical direction along the front end of the airbag between an upper part of the airbag on a ceiling side of the vehicle and a lower part of the airbag on a floor side of the vehicle when the airbag is deployed,
• the rear edge is shaped so as to extend in the vertical direction in a vicinity of the rear end of the airbag between the upper part and the lower part of the airbag when deployed, and
• the front edge of the tether is continuously joined in the vertical direction to a vicinity of the front end of the airbag, and the tether is attached so as to move in the vertical direction and a horizontal direction in a state of being pulled in an oblique direction which is inclined with respect to the vertical direction from the front end to the rear end of the airbag when deployed, and
• the airbag is formed of at least two blanks of fabric material joined together at perimeter edges, wherein the rear edge of the tether is attached to the rear end of the airbag by providing a hole for inserting a stud bolt of the inflator on the rear edge of the tether and fitting the stud bolt into the hole, the airbag blanks and the tether configured such that when the airbag blanks and the tether are laid flat the hole is displaced from the inflator stud bolt along an oblique line having a vertical component extended downwardly and a horizontal component extending in a rearward direction, and upon displacing the tether and the hole to fit over the stud bolt, the fabric blanks become rolled or folded.