Inflatable seat belt having bag filter

Abstract

An inflatable seat belt apparatus is formed of an inflatable portion which is usually maintained in a band shape and has an envelope part inflated and deployed in a spindle shape by introducing gas generated by a gas generating device, the gas generating device acting in case of exceeding a predetermined threshold, a webbing having the inflatable portion extending over at least a range directly contacting with an occupant, a tongue fixed to an end of the inflatable portion and having a gas path from the gas generating device and a buckle to which the tongue is detachably engaged. The inflatable portion has an elastic inflatable unit inserted into the envelope part and is inflated and deployed by introducing the gas generated by the gas generating device into the elastic inflatable unit via a filter.

Description

BACKGROUND OF THE INVENTIONThe present invention relates to an inflatable seat belt apparatus, more particularly to an inflatable seat belt wherein a webbing of a seat belt apparatus to restrain an occupant has an inflatable structural portion formed in an envelope shape which is usually maintained in a band shape and is inflated, in an accident in a predetermined form to withstand high temperature gas spouted from a gas generating means.Presently, a seat belt apparatus is necessary for a vehicle or the like as an apparatus for securing in occupant's body, which restrains the occupant from sudden movement by a deceleration and an impact in a crash.Such a seat belt apparatus comprises a webbing as a woven belt made of a fabric which has approximately a 50 mm width and is formed according to Japanese Industrial Standard, a retractor (hereinafter referred to ELR: Emergency Locking Retractor), a buckle, a tongue, an anchor and so on. The ELR winds the webbing by a winding force of a spr...

AI Technical Summary

Benefits of technology

It is therefore an object of the present invention is to solve the above mentioned conventional problems and to provide an inflatable seat belt apparatus having a high safety, wherein a tube of an inflatable belt portion is not damaged even if the tube is exposed to high temperature gas.

Therefore, the high temperature and high pressure gas can be lowered and the cinder having high temperature can be collected by the filter so as to prevent the elastic inflatable unit from melting and breakage by gluing the cinder discharged with the gas introduced into the elastic inflatable unit onto the inner surface of the elastic inflatable unit.

In this case, the filter is preferably a cylindrical bag filter inserted into the elastic inflatable unit. Thus, the temperature of the gas can be lowered along the longitudinal direction of the inflatable portion and the cinder can be collected with a wider area so as to prevent the filter from binding. Therefore, the inflatable portion can be inflated and deployed without fail.

Problems solved by technology

However, it is difficult to provide a reclining function having a movable portion to the front seat if the air bag apparatus is mounted on the rear side of the back portion of the front seat.

However, many cinders are produced by the combustion of the propellant of the inflator.

Because the cinder has a high temperature and has a large heat capacity compared with the gas, the cinder harms the rubber surface of the tube when the cinder collides with the inner surface of the tube.

When the rubber surface is badly harmed, there is a possibility of making a hole in the tube.

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