Method for manufacturing air bag, air bag, and vehicle seat apparatus

Patent metadata

Field	Value
Publication number	US-11850806-B2
Application number	US-202117205104-A
Country	US
Kind code	B2
Filing date	Mar 18, 2021
Priority date	May 15, 2020
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

A method for manufacturing an air bag includes forming a bag portion surrounded by a welded portion extending in an annular shape by pressing at least one welding mold against two sheet materials arranged to be stacked from a stacking direction of the sheet materials. The welding mold is pressed against the sheet materials to form the welded portion including a welding bead portion protruding to an inside of the bag portion between the sheet materials. A pressing surface of the welding mold against the sheet materials is provided with a slope portion facing in the stacking direction of the sheet materials and in a direction of the inside of the bag portion at a position further on an outside of the bag portion than a position at which the welding bead portion is formed.

First claim

The invention claimed is:

1. A method for manufacturing an air bag, comprising:
forming a bag portion surrounded by a welded portion extending in an annular shape by pressing at least one welding mold against two sheet materials arranged to be stacked from a stacking direction of the sheet materials,
wherein the welding mold is pressed against the sheet materials to form the welded portion including a welding bead portion protruding to an inside of the bag portion between the sheet materials, and
wherein a pressing surface of the welding mold against the sheet materials is provided with a slope portion facing in the stacking direction of the sheet materials and in a direction of the inside of the bag portion at a position further on an outside of the bag portion than a position at which the welding bead portion is formed.

2. The method for manufacturing an air bag according to claim 1 , wherein the slope portion has a convex curved surface shape.

3. The method for manufacturing an air bag according to claim 1 , wherein the slope portion is formed by chamfering a corner portion formed by the pressing surface and a side wall surface of the welding mold intersecting with the pressing surface.

4. The method for manufacturing an air bag according to claim 1 , wherein the welding mold includes as the pressing surface
a first pressing surface pressed against an outer surface of the sheet material, and
a second pressing surface pressed against the outer surface of the sheet material at a position further backward in a pressing direction of the welding mold than the first pressing surface, and
wherein the slope portion is provided at a boundary portion between the second pressing surface and the side wall surface of the welding mold intersecting with the second pressing surface.

5. The method for manufacturing an air bag according to claim 4 , wherein the welding mold includes the slope portion which is second provided at a boundary portion between the first pressing surface and the second pressing surface.

6. The method for manufacturing an air bag according to claim 1 , wherein the welding mold includes a recess formed on the pressing surface.

7. The method for manufacturing an air bag according to claim 1 , wherein the welding molds which are first and second that sandwich the sheet materials in the stacking direction of the sheet materials are used to form the welded portion surrounding the bag portion.

8. An air bag comprising:
a bag portion surrounded by a welded portion formed in an annular shape formed by two sheet materials welded to each other,
wherein the welded portion includes
a first welded portion formed at a position outside the bag portion,
a welding bead portion formed between the sheet materials in a state of protruding to an inside of the bag portion,
a second welded portion formed at a position between the welding bead portion and the first welded portion in a state of bulging to an outside of the bag portion, and
a filling portion forming a slope connecting an outer surface of the second welded portion facing in a stacking direction of the sheet materials to an outer surface of the sheet material by filling at the outside of the bag portion a boundary portion between the second welded portion and a connecting end of the sheet material connected to the second welded portion.

9. The air bag according to claim 8 , wherein the welded portion includes a second filling portion forming a second slope connecting an outer surface of the first welded portion to the outer surface of the second welded portion by filling a boundary portion between the first welded portion and the second welded portion.

10. The air bag according to claim 8 , further comprising:
a protruding portion protruding from the outer surface of the first welded portion.

11. The air bag according to claim 8 , wherein the welded portion includes the second welded portion and the slope on each side in the stacking direction of the sheet materials.

12. A vehicle seat apparatus comprising the air bag according to claim 8 .

Assignees

• Aisin Corp

Inventors

• Kurematsu Yasuhito
• Sakai Makoto
• Mizuno Ryosuke
• Masuda Satoshi
• Seki Tomokazu
• Hasegawa Masaaki
• Yamamoto Tsuyoshi
• Kanbara Tomoko

Classifications

• B29C66/436 Primary

  Joining sheets for making articles comprising cushioning or padding materials, the weld being performed through the cushioning material, e.g. car seats (joining through openings B29C66/304) · CPC title

• B29C66/8322

  Joining or pressing tools reciprocating along one axis · CPC title

• B60N2/914 Primary

  Hydro-pneumatic adjustments of the shape · CPC title

• B60N2/976

  massaging systems · CPC title

• B29L2031/443

  Chairs · CPC title