US 5,316,337 AGranted

Inflatable bags for airbag passive restraint systems for front seat passenger and methods for manufacturing thereof

AssigneesToyo Tire & Rubber Co., Ltd., Toyota Jidosha Kabushiki Kaisha

InventorsTakeshi Yamaji, Toru Ozaki, Koji Sugiura, Kazuaki Bito, Motoaki Naruse, Hidehito Sogi

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Abstract

An inflatable bag,for airbag restraint systems for a front seat passenger, of a quadrilateral prismoidal shape comprising a right-angled quadrilateral base portion adapted to face and receive the passenger by the extension of the bag upon deployment, a lip portion defining an opening for admitting gas from the system and adapted to be attached to a dashboard, upper and lower face portions, and lateral face portions having T-like or Y-like joints diverging from the lip to base portions and exhibiting a strap effect. The bag is made of a one-piece cloth, each outlining lateral side of which has longitudinally consecutive six sides of three triangular sections wherein two endmost sides and respective two adjoining sides have respectively an equal length, or longitudinally consecutive five sides wherein two endmost sides have an equal length and other two sides adjacent to the former have a total length equal to the length of a longitudinal side therebetween. When the cloth is longitudinally folded into two, the endmost sides are superposed and sewed together. Then, respective adjoining sides are superposed and sewed together, thus forming the Y-like joints and lateral face portions, or other two sides are superposed onto the longitudinal side and sewed together, thus forming the T-like joints and lateral portions, thereby shaping the prismoidal body, which is turned inside out to give the bag. The endmost sides may assume an arc-like line.

Claims24

Dependent claims

An inflatable bag for airbag passive restraint systems for a front seat passenger having a generally quadrilateral prismoidal body and being made of a one-piece cloth, wherein said bag comprises a base portion of a right-angled quadrilateral shape adapted to face and receive the passenger by the extension of the bag upon inflation and deployment, opposing lateral face portions of a generally trapezoidal shape, opposing upper and lower face portions of a generally trapezoidal form, and a lip portion defining a quadrilateral opening of the prismoidal body for admitting therethrough gas from the system and adapted to be fastened through a housing for the bag to an instrument panel, said lateral face portions having each a T-like joint diverging from the lip portion to the base portion and exhibiting a strap effect capable of regulating the extension and flaring of the bag upon deployment, thus having a tapered profile diverging from the lip to base portions;

said one-piece cloth comprises a first generally trapezoidal section and a second generally trapezoidal section respectively mainly corresponding to the upper and lower face portions of the bag, a central right-angled quadrilateral section corresponding to the base portion of the bag and interposed longitudinally between the first and second trapezoidal sections so that its parallel lateral sides may coincide with parallel longer sides of the first and second trapezoidal sections, a pair of first generally triangular sections extending laterally from non-parallel sides of the first trapezoidal section, a pair of second generally triangular sections extending laterally from nonparallel sides of the second trapezoidal section, the first triangular section and the second triangular section on each lateral side of the cloth having end sides of an equal length and mutually near sides having a total length equal to the length of a longitudinal side of the central section, and respective salient apex angles totaling to about 180.degree., whereby the first triangular sections and the second triangular sections are adapted cooperatively to form the T-like joints and the lateral face portions.

An inflatable bag for airbag passive restraint systems for a front seat passenger having a generally quadrilateral prismoidal body and being made of a one-piece cloth, wherein said bag comprises a base portion of a right-angled quadrilateral shape adapted to face and receive the passenger by the extension of the bag upon inflation and deployment, opposing lateral face portions of a generally trapezoidal shape, opposing upper and lower face portions of a generally trapezoidal shape, and a lip portion defining a quadrilateral opening of the prismoidal body for admitting therethrough gas from the system and adapted to be fastened through a housing for bag to an instrument panel, said lateral face portions having each a Y-like joint diverging from the lip portion toward the base portion and exhibiting a strap effect capable of suppressing flaring or protrusion of the bag upon inflation and deployment, thus having a tapered profile diverging from the lip to base portions;

said one-piece cloth comprises a first generally trapezoidal section and a second generally trapezoidal section corresponding mainly to the upper and lower face portions respectively of the bag, a central right-angled quadrilateral section corresponding to the base portion of the bag and being longitudinally interposed between the first and second trapezoidal sections so that its lateral parallel sides may be common to parallel longer sides of both trapezoidal sections, a pair of first generally triangular sections extending laterally from non-parallel sides of the first trapezoidal section, a pair of second generally triangular sections extending laterally from non-parallel sides of the second trapezoidal section, and a pair of third generally triangular sections extending laterally from parallel longitudinal sides of the central section, the first triangular section and the second triangular section on each lateral side of the cloth having end sides of an equal length, the first triangular section and the third triangular section on each lateral side of the cloth having adjoining sides of an equal length, the third triangular section and the second triangular section on each lateral side of the cloth having adjoining sides of an equal length, whereby the first, second and third triangular sections on respective sides of the cloth are adapted cooperatively to form the lateral face portions together with the Y-like joints.

Dependencies are inferred from the claim text.