Vehicle seat equipped with side airbag device, and side airbag device

A side airbag device comprising:

• an inflator configured to supply a gas;
• a diffuser that contains the inflator;
• an inner chamber of which an inside communicates with an inside of the diffuser through a first supply port formed in a peripheral wall of the diffuser;
• and
• an outer chamber of which an inside communicates with the inside of the inner chamber through a second supply port formed in the inner chamber,
• wherein the side airbag device is configured so that the outer chamber is outward of the inner chamber in a vehicle width direction when the outer chamber and the inner chamber are inflated,
• the inner chamber is configured to deploy outward of a vehicle seat, and
• the diffuser is configured to be located between a rear part of the outer chamber and a rear part of the inner chamber when the outer chamber and the inner chamber are inflated and deployed.

A vehicle seat equipped with a side airbag device comprising:

• an inflator disposed on an outer side in a vehicle width direction relative to a side frame installed inside a side part of a seatback, the side part being located on an outer side in the seatback in the vehicle width direction;
• an inner chamber housed inside the side part and that is configured to inflate and deploy outward of the vehicle seat toward a part of an occupant on the outer side in the vehicle width direction upon receiving supply of a gas from the inflator;
• an outer chamber housed inside the side part, and is configured to inflate and deploy toward the outer side in the vehicle width direction and a vehicle front side relative to the inner chamber upon receiving supply of the gas;
• and
• a diffuser housed inside the side part and contains the inflator, the diffuser being configured to supply the gas into the inner chamber from a first supply port formed in a peripheral wall of the diffuser when the inflator is activated, wherein
• the first supply port opens toward a part of the occupant on the outer side in the vehicle width direction,
• the diffuser is configured to be foldable, and
• the diffuser and the inner chamber are configured such that, when the diffuser has received supply of the gas from the inflator, the first supply port is located farther on the vehicle front side than the side frame, and the gas supplied into the inner chamber is supplied into the outer chamber through a second supply port of the inner chamber.

A vehicle seat equipped with a side airbag device comprising:

• an inflator disposed on an outer side in a vehicle width direction relative to a side frame installed inside a side part of a seatback, the side part being located on an outer side in the seatback in the vehicle width direction;
• an inner chamber housed inside the side part and that is configured to inflate and deploy outward of the vehicle seat toward a part of an occupant on the outer side in the vehicle width direction upon receiving supply of a gas from the inflator;
• an outer chamber housed inside the side part, and is configured to inflate and deploy toward the outer side in the vehicle width direction and a vehicle front side relative to the inner chamber upon receiving supply of the gas;
• a diffuser housed inside the side part and contains the inflator, the diffuser being configured to supply the gas into the inner chamber from a first supply port formed in a peripheral wall of the diffuser when the inflator is activated;
• and
• a strap, wherein one end of the strap is mounted on the inner chamber, and the other end of the strap is mounted on the side frame.