Airbag device

Patent metadata

Field	Value
Publication number	US-10864883-B2
Application number	US-201916361948-A
Country	US
Kind code	B2
Filing date	Mar 22, 2019
Priority date	Mar 28, 2018
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

An airbag device includes: an airbag which inflates from a state of a folded body by receiving an inflation gas; and a wrapping material wraps the folded body. The folded body has a three-dimensional shape including a bottom surface portion, a ceiling portion, and a side surface portion. The wrapping material includes: a cover member having flexibility and a sheet shape which includes a ceiling cover portion covering the ceiling portion of the folded body, a side surface cover portion covering the side surface portion, and a bottom surface cover portion which covers the bottom surface portion and has a locking hole to be locked to a fastener, and an elongation regulating member which is provided on at least a part of the cover member so as to suppress elongation of the cover member in opposition to an acting direction of the restoring force of the folded body.

First claim

What is claimed is:

1. An airbag device comprising:
an airbag which inflates from a state of a folded body by receiving an inflation gas; and
a wrapping material having flexibility which wraps the folded body to maintain a folded shape of the folded body and to resist a spring back force following folding that forms the folded body, wherein:
the folded body has a three-dimensional shape including a bottom surface portion, a ceiling portion disposed to face the bottom surface portion, and a side surface portion between the bottom surface portion and the ceiling portion;
the wrapping material is disposed to cover a surface side over the ceiling portion, the side surface portion, and the bottom surface portion of the folded body;
the airbag device is locked to a fastener disposed on a bottom surface portion side of the folded body; and
the wrapping material includes:
a cover member having flexibility and a sheet shape which includes a ceiling cover portion covering the ceiling portion of the folded body, a side surface cover portion covering the side surface portion, and a bottom surface cover portion which covers the bottom surface portion and has a locking hole to be locked to the fastener; and
an elongation regulating member which is provided on at least a part of the cover member so as to suppress elongation of the cover member in opposition to an acting direction of the spring back force that acts to unfold the folded body,

wherein the elongation regulating member is constituted by an elongation regulating sewn portion formed by sewing a sewing thread at a position where elongation of the cover member is suppressed.

2. The airbag device according to claim 1 , wherein
the elongation regulating member is further constituted by an elongation regulating coating agent applied to the cover member.

3. The airbag device according to claim 1 , wherein:
a plurality of fasteners including the fastener are provided, the plurality of fasteners are disposed at a plurality of positions on an outer peripheral edge side of the bottom surface portion; and
the elongation regulating sewn portion includes:
a lateral-surface-side sewn portion which is disposed so as to extend from an edge of the side surface cover portion in a vicinity of each fastener of the plurality of fasteners which is the edge on a bottom surface cover portion side in the vicinity of the fastener to the ceiling cover portion; and
a ceiling-side sewn portion disposed so as to extend from an end portion on the ceiling cover portion side in the lateral-surface-side sewn portion to a center side of the ceiling cover portion and have at least a part which extends along an outer peripheral edge of the ceiling cover portion in a vicinity of the outer peripheral edge of the ceiling cover portion.

4. The airbag device according to claim 1 , wherein
in a peripheral edge of a locking hole to which the fastener is locked, the elongation regulating sewn portion includes at least a locking-hole-side sewn portion disposed on an edge side in a direction opposite to the acting direction of the spring back force that acts to unfold the folded body.

5. The airbag device according to claim 1 , wherein:
the folded body is formed by being compressed in a direction in which the ceiling portion and the bottom surface portion approach each other; and
the ceiling portion of the folded body is provided with a recess portion which is recessed further downward than an outer peripheral edge side in a portion in a vicinity of a center, and a raised portion which includes a ceiling surface substantially parallel to the bottom surface portion on the outer peripheral edge side and is raised from the recess portion so as to surround the recess portion.

6. An airbag device comprising:
an airbag which inflates from a state of a folded body by receiving an inflation gas; and
a shape maintaining member having flexibility which covers the folded body to maintain a folded shape of the folded body and to resist a spring back force following folding that forms the folded body, wherein:
the folded body has a three-dimensional shape including a bottom surface portion, a ceiling portion disposed to face the bottom surface portion, and a side surface portion between the bottom surface portion and the ceiling portion;
a fastener for locking an end portion of the shape maintaining member protrudes from a vicinity of an outer peripheral edge of the bottom surface portion;
the shape maintaining member is formed of a flexible sheet material including a ceiling cover portion which covers the ceiling portion of the folded body, a side surface cover portion which extends from an end portion of the ceiling cover portion and covers the side surface portion, and a bottom surface cover portion which extends from the side surface cover portion to cover the bottom surface portion and has a locking hole to be locked to the fastener;
the ceiling cover portion is provided with a center portion covering a vicinity of a center of the ceiling portion and constituted to linearly extend from the center portion to both sides of the ceiling portion so as to traverse the ceiling portion and one end side of both sides of the ceiling cover portion is fixed as a terminal to an edge side of the ceiling portion and the other end side is connected to the side surface cover portion; and
the shape maintaining member in a state of being flatly spread is configured to linearly arrange the bottom surface cover portion and the side surface cover portion which extend from the locking hole to a fixed portion of the ceiling cover portion which is the portion fixed to the edge side of the ceiling portion and the ceiling cover portion.

7. The airbag device according to claim 6 , wherein:
a plurality of the fasteners are provided in a vicinity of an outer peripheral edge of the bottom surface portion of the folded body so as to be disposed with a radial arrangement around a center of the bottom surface portion; and
a plurality of the shape maintaining members are disposed so as to intersect mutual ceiling cover portions and lock the bottom surface cover portions to the fasteners in different positions.

8. The airbag device according to claim 6 , wherein
the ceiling cover portion of the shape maintaining member is directly fixed to an outer peripheral edge of the ceiling portion of the folded body.

9. The airbag device according to claim 6 , wherein:
a wrapping material which covers a surface side over the ceiling portion, the side surface portion, and the bottom surface portion of the folded body and is disposed to be locked to the fastener is provided;
the shape maintaining member is provided on an outer surface side of the wrapping material; and
the ceiling cover portion of the shape maintaining member is fixed to a part of the wrapping material covering the ceiling portion and is fixed to an edge side of the ceiling portion of the folded body in a state where the wrapping material covering the ceiling portion is interposed.

10. The airbag device according to claim 6 , wherein:
the folded body is formed by being compressed in a direction in which the ceiling portion and the bottom surface portion approach each other; and
the ceiling portion of the folded body is provided with a recess portion which is recessed further downward than an outer peripheral edge side in a portion in a vicinity of a center, and a raised portion which includes a ceiling surface substantially parallel to the bottom surface portion on the outer peripheral edge side and is raised from the recess portion so as to surround the recess portion.

11. A folding method of an airbag which inflates from a folded state by recei

Assignees

• Toyoda Gosei Kk

Inventors

• Yanagisawa Toshihito
• Komatsu Takanori
• Kawamura Koji
• Higashi Hideo

Classifications

• B60R21/203

  in steering wheels or steering columns · CPC title

• B60R21/201 Primary

  Packaging straps or envelopes for inflatable members · CPC title

• B60R21/237 Primary

  characterised by the way they are folded · CPC title

• B60R2021/2375

  Folding devices · CPC title