Airbag device and vehicle seat

An airbag device equipped in a vehicle seat having a seat cushion forming a seat surface, a seatback forming a backrest, and a headrest arranged at an upper part of the seatback, the airbag device comprising:

• an inflator for generating inflation gas;
• an airbag stowed at least within the seatback that expands based on expansion gas discharged from the inflator, the airbag includes a pair of left and right side chambers configured to deploy from side parts of the seatback forward and an upper chamber provided continuously with the side chambers and configured to deploy above the head of an occupant, a portion of the airbag corresponding to the upper chamber is stowed in a stowing part provided above the seatback on a rear surface of the headrest;
• and a cover member disposed between the airbag and the seatback, the cover member configured to deploy toward the rear surface of the headrest in conjunction with deployment of the airbag,
• wherein the airbag is configured to deploy up and over a top of the headrest and the cover member is deployable between the airbag and a rear side of the headrest
• wherein the cover member extends around at least 3 sides of the airbag prior to deployment of the airbag.

An airbag device equipped in a vehicle seat having a seat cushion forming a seat surface, a seatback forming a backrest, and a headrest arranged at an upper part of the seatback, the airbag device comprising:

• an inflator for generating inflation gas;
• an airbag stowed at least within the seatback that expands based on expansion gas discharged from the inflator, the airbag includes a pair of left and right side chambers configured to deploy from side parts of the seatback forward and an upper chamber provided continuously with the side chambers and configured to deploy above the head of an occupant, a portion of the airbag corresponding to the upper chamber is stowed in a stowing part provided above the seatback on a rear surface of the headrest;
• and
• a cover member disposed between the airbag and the seatback, the cover member configured to deploy toward the rear surface of the headrest in conjunction with deployment of the airbag,
• wherein the cover member includes a first portion extending over the airbag and a second portion extending along a rear side of the airbag prior to deployment of the airbag
• wherein the cover member extends around at least 3 sides of the airbag prior to deployment of the airbag.