# US 11,299,123 B2 · Front airbag device for vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,299,123 B2 - Document ID: US11299123B2 - Status: Granted - Kind: B2 - Application number: 17/096,428 - Filed: 2020-11-12 - Published: 2021-05-20 - Granted: 2022-04-12 - Earliest claimed: 2019-11-18 - Assignees: Hyundai Mobis Co., Ltd. - Applicants: Hyundai Mobis Co., Ltd. - Inventors: Hae Kwon Park; Seok Min Lee - Web page: https://patentgrep.com/patent/US11299123B2 ## CPC - B60R 21/2338: Tethers - B60R 21/01554: {Seat position sensors} - B60R 21/205: in dashboards - B60R 21/231: characterised by their shape, construction or spatial configuration - B60R 2021/0004: {Frontal collision} - B60R 2021/0009: {Oblique collision} - B60R 2021/0023: {Offset collision} - B60R 2021/0032: {Position of passenger} - B60R 2021/0048: {Head} - B60R 2021/01238: {control of expansion shape} - B60R 2021/23382: {Internal tether means} - B60R 2021/23384: {having ends which are movable or detachable during deployment} - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR ## Abstract A front airbag device for a vehicle is proposed. In the front airbag device, an airbag cushion is mounted in front of a passenger and is expanded to be positioned at a front surface of the passenger, a triangular main tether and a triangular support tether are positioned inside the airbag cushion, and one side of the main tether and one side of the support tether are spaced apart from each other and are coupled to the airbag cushion in a sewn manner, so that the main tether and the support tether support a front surface portion of the airbag cushion to protect a front surface of the passenger. ## Claims ### Claim 1 A front airbag device for a vehicle, the front airbag device comprising: an airbag cushion configured to be expanded toward a front passenger by pressure of airbag gas generated when an inflator explodes; a main tether and a support tether, which are connected to the airbag cushion to maintain a shape of the expanded airbag cushion, wherein the main tether and the support tether are configured as plane tethers that are unfolded when the airbag cushion is expanded and support a front surface portion of the airbag cushion within a predetermined area; a wire cutter provided on one side of the inflator; and a tether wire connecting the wire cutter to the main tether; wherein the wire cutter is configured to be operated to cut the tether wire under a control of a vehicle controller only when a vehicle crash occurs in a situation in which a front seat is in a relaxation mode. ### Claim 2 (depends on 1) The front airbag device of claim 1, wherein the vehicle controller determines the relaxation mode of the front seat by receiving a signal of a seatback angle sensor provided in the front seat. ### Claim 3 (depends on 1) The front airbag device of claim 1, wherein the main tether is configured to be unfolded in a triangular shape when the airbag cushion is expanded, the main tether being configured such that one vertex of the triangular shape is connected to the tether wire and one side thereof facing the vertex is coupled to the airbag cushion. ### Claim 4 (depends on 1) The front airbag device of claim 1, wherein the support tether is configured to be unfolded in a triangular shape when the airbag cushion is expanded, the support tether being configured such that one vertex of the triangular shape has a ring through which the tether wire passes and one side thereof facing the ring is coupled to the airbag cushion. ### Claim 5 (depends on 4) The front airbag device of claim 4, wherein the ring of the support tether is configured to be moved along the tether wire by external force acting on the airbag cushion when the airbag cushion is expanded. ### Claim 6 (depends on 1) The front airbag device of claim 1, wherein the main tether and the support tether are configured to be respectively unfolded in triangular shapes when the airbag cushion is expanded; one side of the triangular main tether and one side of the triangular support tether are spaced apart from each other and are coupled to the airbag cushion in a sewn manner; and one side of the main tether and one side of the support tether are configured to be unfolded in one of a vertical direction and a horizontal direction to the airbag cushion. ### Claim 7 (depends on 1) The front airbag device of claim 1, wherein in a situation in which the airbag cushion is expanded but the tether wire is not cut, the front surface portion of the airbag cushion is expanded with a center protrusion protruding toward the front passenger, side protrusions at opposite sides, and two valleys connecting the opposite side protrusions to the center protrusion in a wave shape; and the main tether and the support tether are respectively connected to the two valleys. ### Claim 8 (depends on 7) The front airbag device of claim 7, wherein when a frontal crash occurs, a head of the front passenger is brought into contact with the center protrusion and then is moved to one of the valleys at one side, so that opposite sides of the head are supported by the center protrusion and one of the side protrusions. ### Claim 9 (depends on 7) The front airbag device of claim 7, wherein in a situation of an inclination crash, a head of the front passenger is inserted into one of the valleys between the center protrusion and one of the side protrusions; the head of the front passenger inserted in the valley is supported by the support tether that is unfolded in a plane; and when the head of the front passenger is supported by the support tether, the support tether absorbs impact while being moved along the tether wire. ### Claim 10 (depends on 1) The front airbag device of claim 1, wherein in the situation in which the front seat is in the relaxation mode, when the airbag cushion is expanded and the tether wire is cut, the front surface portion protrudes toward the front passenger; and as a protruding length of the airbag cushion is increased due to the front surface portion thereof protruding toward the front passenger, initial restraint of the front passenger is strengthened.