Side air bag device

Details Side air bag device Side air bag device

1997-05-01

1998-09-22

Ellis, Christopher P.

Land vehicles

Wheeled

Attachment

2807283, B60R 2122

Patent

active

058103899

DESCRIPTION:

BRIEF SUMMARY
TECHNOLOGICAL FIELD

This invention relates to a side air bag device for protecting an occupant from the side in the case of a collision accident of a vehicle.


BACKGROUND ART

An air bag device is a device for restraining an occupant by inflation of an air bag in the case of a vehicle collision, and generally is made up of an inflator, which is a gas generator, an air bag capable of inflating by gas from the inflator, and an air bag case housing the air bag and the inflator.
Air bag devices are not limited to those which restrain the occupant from the front, and recently, as disclosed in JP-A-06064491, ones which restrain from the side have been being developed. With these side air bag devices, for example, an air bag case housing the air bag and the inflator is embedded in a compartment wall side of a seat such as in the door side of a seat backrest, a seat covering material covering the surface of the seat has in the vicinity of an opening of the air bag case a stitching part where a covering material covering said opening and another covering material are stitched together, this stitching part is split open by a predetermined deployment pressure of the air bag, and the air bag deploys through this split-open gap.
In the above-mentioned splitting-open of the stitching part, depending mainly on differences in the elongation of the covering materials and the elongation of the stitching thread, there is a type of this splitting wherein the stitching part splits open as a result of sewing-machine perforations of the cover material breaking and a type wherein the stitching part splits open as a result of the stitching thread breaking.
The former type is widely used for example with composite seat covering materials made of a vinyl chloride leather and a lining material, and the latter type is widely used for example with composite seat covering materials made by lining a fabric material (raised material, moquette) with a polyurethane foam seat material.
However, there is the limitation that in the case of the former type of splitting wherein sewing-machine perforations of the cover material are to be broken the strength of the stitching thread must be stronger than the strength of the covering material between sewing-machine perforations and in the case of the latter type of splitting wherein the stitching thread is to be broken reversely the seat covering material must be stronger, and both cases require a high-level balance in quality and technology aspects.
It is therefore an object of a first invention of the invention to provide a side air bag device, by discovering a new construction making a start to splitting-open of a stitching part, with which easily it is possible to achieve causing a stitching part to split-open rapidly, a strength balance between a seat covering material and a stitching thread can be achieved simply and it is possible to increase productivity greatly.
On the other hand, the conventional side air bag device described above has the shortcoming that because the air bag case is installed immediately behind the seat covering material there is a hardness in the feel from the seat surface.
It is therefore an object of a second invention of the invention to provide a side air bag device with which by disposing a seat pad between the air bag case and the seat covering material and using a construction such that this pad can be split open it is possible to provide comfort with excellent feel from the seat surface and with no feeling of incongruity in the seat.


DISCLOSURE OF THE INVENTION

A side air bag device of the first invention of the invention is one wherein, in a side air bag device which is an air bag device embedded in a compartment wall side of a seat of a vehicle wherein a seat covering material has in the vicinity of an air bag case opening a stitching part where a covering material covering the opening and another covering material are stitched together and this stitching part is to be split open by means of a predetermined deployment pressure of an air bag, a band for sup

REFERENCES:
patent: 5647609 (1997-07-01), Spencer et al.
patent: 5651582 (1997-07-01), Nakano
patent: 5676394 (1997-10-01), Maly

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