# US 8,770,618 B2 · Curtain airbag device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,618 B2 - Document ID: US8770618B2 - Status: Granted - Kind: B2 - Application number: 13/714,028 - Filed: 2012-12-13 - Published: 2013-06-20 - Granted: 2014-07-08 - Earliest claimed: 2011-12-15 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Osamu Fukawatase; Hiroyuki Taguchi - Inventors: Osamu Fukawatase; Hiroyuki Taguchi - Web page: https://patentgrep.com/patent/US8770618B2 ## CPC - B60R 21/232: Curtain-type airbags deploying mainly in a vertical direction from their top edge - B60R 21/2342: Tear seams - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR ## Abstract A curtain airbag device that is housed at a top edge portion of a side window glass placement location of a vehicle body, and the curtain airbag device comprising a gas supply passage that receives supplied gas and is deployed along a top portion of the side window glass placement location and towards a vehicle bottom direction; an occupant protection portion that is deployed to a lower side of the gas supply passage by receiving supplied gas through the gas supply passage; a gas release section that releases gas from inside the gas supply passage when an internal pressure of the gas supply passage reaches a specific pressure or higher, the specific pressure being higher than a design deployment pressure; and an internal pressure regulation chamber that accepts gas released by the gas release section. ## Claims ### Claim 1 A curtain airbag device that is housed at a top edge portion of a side window glass placement location of a vehicle body, the curtain airbag device comprising: a gas supply passage that receives supplied gas and is deployed along a top portion of the side window glass placement location and towards a vehicle bottom direction; an occupant protection portion that is deployed to a lower side of the gas supply passage by receiving supplied gas through the gas supply passage; a gas release section that releases gas from inside the gas supply passage when an internal pressure of the gas supply passage reaches a specific pressure or higher, the specific pressure being higher than a design deployment pressure; a plurality of attachment tabs that project out towards a vehicle top from a vehicle top end side of the gas supply passage at intervals along a vehicle front-rear direction, the plurality of attachment tabs are respectively attached to the top edge portion; and an internal pressure regulation chamber that accepts gas released by the gas release section, the internal pressure regulation chamber is integrally provided to the gas supply passage at a vehicle top side of the gas supply passage, the internal pressure regulation chamber is disposed between the plurality of attachment tabs; wherein the gas release section is configured such that when the internal pressure of the gas supply passage reaches the specific pressure or higher, the internal pressure causes a closed-off state between the gas supply passage and the internal pressure regulation chamber to change to a communicated state. ### Claim 2 (depends on 1) The curtain airbag device of claim 1 wherein: the curtain airbag device further comprises a plurality of attachment tabs that project out towards the vehicle top from a vehicle top end side of the gas supply passage at intervals along the vehicle front-rear direction, and that are respectively attached to the top edge portion; and the internal pressure regulation chamber projects out further than the plurality of attachment tabs with respect to the gas supply passage. ### Claim 3 (depends on 1) The curtain airbag device of claim 1, wherein the gas release section is configured such that a communication passage between the gas supply passage and the internal pressure regulation chamber is closed-off by sewing or adhering so as to split or come apart due to the internal pressure reaching the specific pressure or higher. ### Claim 4 (depends on 1) The curtain airbag device of claim 1 wherein a plurality of the gas release sections and a plurality of the internal pressure regulation chambers are provided. ### Claim 5 (depends on 1) The curtain airbag device of claim 1 wherein: the occupant protection portion comprises a front main chamber that protects a front seat occupant and a rear main chamber that protects a rear seat occupant; and the gas release section and the internal pressure regulation chamber are disposed at a vehicle front side of the front main chamber and to the vehicle top side with respect to the gas supply passage. ### Claim 6 A curtain airbag device comprising: a curtain airbag that is housed in a folded up state at a top edge portion of a side window glass placement location of a vehicle body, and that receives supplied gas and is deployed along the side window glass and towards a vehicle bottom direction; a gas release section that releases gas inside the curtain airbag from an upper portion of the curtain airbag when internal pressure of the curtain airbag reaches a specific pressure or higher, the specific pressure being higher than a design deployment pressure; a plurality of attachment tabs that project out towards a vehicle top from a vehicle top end side of the curtain airbag at intervals along a vehicle front-rear direction, the plurality of attachment tabs are respectively attached to the top edge portion; and an internal pressure regulation chamber that accepts gas released by the gas release section, the internal pressure regulation chamber is integrally provided to the curtain airbag at a vehicle top side of the curtain airbag, the internal pressure regulation chamber is disposed between the plurality of attachment tabs; wherein the gas release section is configured such that the internal pressure at the specific pressure of higher causes a closed-off state between the curtain airbag and the internal pressure regulation chamber to change to a communicated state.