Abstract:
A passenger protecting apparatus is composed so that an airbag is provided above a door opening of a vehicle body in a folded situation, is inflated and unfurled downward in gas inflow, is fixed to said vehicle body by a fitting through a bracket and the bracket positions a through-hole, through which the fitting to fix the bracket to the vehicle body is inserted, below the airbag attached to and housed in the vehicle body.

Description:
FIELD OF THE INVENTION 
     The present invention relates to a passenger protecting apparatus which inflates and unfurls an airbag like a curtain along side window glasses in a passenger compartment if a vehicle side collision and roll over are detected or foreseen. 
     BACKGROUND OF THE INVENTION 
     Conventionally, a passenger protecting apparatus is devised, wherein if a vehicle side collision and roll over are detected or foreseen, an airbag housed as folded at an upper portion of a vehicle door opening, for example, in a roof side rail is inflated/unfurled, thereby absorbing and buffering an impact strength added to a passenger&#39;s head according to a cushion effect of the airbag in the case of a vehicle side collision and roll over, thus protecting the passenger&#39;s head. 
     A conventional passenger protecting apparatus houses an airbag as folded in a roof side rail to absorb/buffer an impact strength added to a passenger&#39;s head, and in the case of detecting a side collision with another vehicle and the like by a detector, the folded airbag is filled in with gas by an inflator and inflated/unfurled along side window glasses in a passenger compartment like a curtain, thereby supporting the passenger&#39;s head with the inflated/unfurled airbag, wherein in the case of the vehicle side collision and roll over an impact strength added to the passenger&#39;s head is intended to be absorbed and buffered (refer to Japan patent publication 2920291). 
     The conventional passenger protecting apparatus is structured so as to protrusively form attachment pieces like a tongue at an upper brim of the airbag and to fasten it in a folded situation to a body by a fitting such as a bolt through holes drilled in each attachment piece. 
     However, this structure causes a dropped bolt from a fastening position to enter in a gap in some occasions when fastening the airbag to a vehicle body because a Through-hole through which a bolt fastens the airbag to the body is positioned above the folded air bag. 
     In this occasion, it takes labor hours and time to take out the dropped bolt from the gap between the airbag and body and to attaching it, respectively. Moreover, because a work position becomes high for a worker who attaches the airbag in the vehicle compartment and an elevation angle becomes larger, accordingly, a worker&#39;s burden becomes larger. 
     Therefore, the conventional passenger protecting apparatus has a problem that it takes labor hours to attach the airbag to the vehicle body, and thereby the airbag cannot be efficiently attached to the body. 
     SUMMARY OF THE INVENTION 
     An exemplary object of the invention is to provide a passenger protecting apparatus which can improve a work efficiency in attaching an airbag to a vehicle body. 
     A passenger protecting apparatus of the invention, in which an airbag is provided above a door opening of a vehicle in a folded situation and in gas inflow the airbag is inflated and unfurled downward, is characterized in that the airbag is composed so as to be fastened to a vehicle by a fitting such as a bolt/nut or rivet through a bracket, and the bracket is composed so that a through-hole, through which the fitting to fasten the bracket to the vehicle is inserted, is positioned below the airbag attached to and housed in the vehicle. 
     The apparatus is designed so that the airbag to absorb and buffer an impact force added to a passenger is attached by being fastened/fixed to the vehicle with a fitting such as a bolt through a bracket and the bracket positions a through-hole, through which the fitting to fasten the bracket to the vehicle is inserted, below the airbag attached to and housed in the vehicle. 
     According to the structure, because a fastening position of the airbag to the vehicle body is positioned below the airbag housed in the vehicle in the folded situation, a bolt dropped from the fastening position can be avoided from entering in a gap between the airbag and body when fastening the airbag to the body using a fitting such as a bolt, and thereby it can be made to prevent long time in a series of work to attach/fasten the airbag to the body from being needed. 
     Moreover, the fastening position of the airbag to the vehicle body can make a work position for a worker fastening the airbag in the vehicle compartment lower, so an elevation angle in fastening the airbag with a bolt can be smaller, and thereby a worker&#39;s burden can be reduced. Therefore, the passenger protecting apparatus enables an efficiency of the attaching work to the vehicle body to be improved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a drawing schematically illustrating a vehicle equipped with a passenger protecting apparatus related to one of embodiments of the invention. 
         FIG. 2  is a drawing illustrating an airbag composing the passenger protecting apparatus. 
         FIG. 3  is a drawing illustrating the airbag attached to a vehicle in a folded situation. 
         FIGS. 4A ,  4 B, and  4 C are drawings illustrating attaching procedures of the airbag to a vehicle. 
         FIG. 5  is a drawing illustrating one embodiment of a rivet in accordance with the principles of the present invention. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     One of embodiments of the invention is described hereinafter referring to the drawings. In the referred drawings,  FIG. 1  is a drawing schematically illustrating a vehicle provided with a passenger protecting apparatus  1  related to one of embodiments of the invention. 
     As shown in  FIG. 1 , the passenger protecting apparatus  1  is equipped with a collision detecting sensor not shown in the drawing to detect a vehicle side collision and roll over, an airbag  3  to protect a passenger from a impact force added in a side collision, and an inflator to fill in gas. 
     The inflator  4  is provided at a vicinity of back end of a roof side rail and a gas generating agent is filled inside it. If the collision detecting sensor detects a collision, the inflator  4  is designed so that an igniting current is supplied, the gas generating agent filled inside is ignited, and the inflator  4  generates gas, thereby filling the generated gas in the airbag  3 . 
     The airbag  3  to absorb and buffer the impact force added to a passenger in the side collision and roll over is inflated by gas being filled inside with the inflator  4 , and thereby, as shown in  FIG. 1 , the airbag  3  is designed to inflate and unfurl like a curtain from an upside toward a downside of vehicle side window glasses in a vehicle compartment. The airbag  3  is a bag formed by seaming cloth made of nylon. As shown in  FIGS. 2 and 3 , a rectangular and tongue-like attachment piece  31  is protrusively formed along an upper brim of the airbag  3  at a predetermined distance. Attachment holes are drilled at an approximate center of each attachment piece. 
     The airbag  3  composed as such, as shown in  FIG. 3 , is designed to be attached to a vehicle pillar inner panel with a protecting cloth  6  wound through a bracket  5  which is an attachment member. In the bracket  5  to attach the airbag to the vehicle body, through-holes  51  and  52  are formed at both ends of the upside/downside. 
     As shown in  FIG. 3 , one main face of attachment piece  31  of the airbag  3  and that of an upper end  5   a  of the bracket  5  accord and another main face of lower end  5   b  of the bracket  5  are combined in an exposed situation below the folded airbag  3 , whereby the airbag  3  and bracket  5  are unified with both being fastened with a bolt and nut through an attachment hole  32  formed in the attachment piece  31  and though-hole  51  at the upper end  5   a  of the bracket  5 . Then, the unified airbag  3  and bracket  5  are attached to a vehicle pillar panel A 5  by both being fastened with the bolt and nut through the through-hole  52  at the lower end  5   b  of the bracket  5  and a fix hole A 51  of the vehicle pillar inner panel A 5 . 
     In the passenger protecting apparatus composed as such, as shown in  FIG. 3 , the airbag  3  is normally folded like a cornice approximately from an upside to downside direction and housed in a roof side rail A 2  like a long scale. 
     In the passenger protecting apparatus composed as such, as shown in  FIG. 3 , the airbag  3  is normally folded like a cornice approximately from an upside to downside direction and housed in a roof side rail  2 A like a long scale. 
     In the above situation, for example, if a vehicle is collided from one side of the vehicle by another vehicle, a collision detecting sensor detects the collision and the inflator  4  fills gas in the airbag  3 . The airbag  3  filled with gas is designed to absorb and buffer an impact force added to a passenger&#39;s head by a cushion effect of the airbag  3  which is, as shown in  FIG. 1 , inflated and unfurled from the housed situation in the roof side rail A 2  like a curtain from an upside of the side window glasses A 3  toward downside in the vehicle compartment. 
     Then, work in attaching the airbag  3  to the vehicle pillar inner panel A 5  composing the passenger protecting apparatus  1  is described. 
     Firstly, as shown in  FIG. 4A , when fastening the airbag  3  to the pillar inner panel A 5  with a bolt, accord one main face of attachment piece  31  of the airbag  3  wound with the protecting cloth  6  in a folded situation with one main face of one end  5   a  of the bracket  5  and combine so that one main face of the other end  5   b  of the bracket  5  is exposed to a downside of the folded airbag  3 . 
     In this situation, as shown in  FIG. 4B , unify the airbag  3  and bracket  5  by fastening them with a bolt and nut through the attachment hole  32  formed in the attachment piece  31  of the airbag  3  and the through-hole  51  of one end  5   a  of the bracket  5 . Then, as shown in  FIG. 4C , with the upper brim of the air bag  3  being positioned as facing upward to the vehicle, fasten the bracket  5  attached to the airbag  3  and the vehicle pillar inner panel A 5  with a bolt and nut through the through-hole  52  of the other end  5   b  of the bracket  5  and the fix hole A 51  of the pillar inner panel A 5 , and attach the bracket  5  to the pillar inner panel A 5 . Thus, the airbag  3  is attached to the pillar inner panel A 5 . 
     Thus, the structure, in which the attachment hole  52  to fasten/fix the bracket  5  to attach the airbag  3  to the pillar inner panel A 5  is positioned at the downside of the folded airbag  3  when fastening the airbag  3  to the vehicle pillar inner panel A 5  with a bolt, enables a bolt dropped from the fastening position to be avoided from entering in the gap between the airbag  3  and body, thereby reducing burdensome work taking out the dropped bolt in the gap between the airbag  3  and body and being able to prevent long time in a series of work to attach/fasten the airbag to the body from being needed. 
     Moreover, for a worker fastening the airbag  3  in a vehicle compartment, a working position becomes lower when fastening the airbag  3  to the vehicle, so an elevation angle in fastening the airbag  3  with a bolt can be smaller, and thereby a worker&#39;s burden can be reduced. Therefore, the passenger protecting apparatus  1  enables an efficiency of attaching work to the vehicle to be improved. 
     Meanwhile, a passenger protecting apparatus of the invention is not limited to the passenger protecting apparatus  1  and there exists no problem in changing as needed as far as requirements of the invention are not deviated. For example, the bracket  5  to attach the airbag  3  to the vehicle pillar inner panel A 5  can be prevented from bending due to the weight of the airbag  3  if the bracket  5  is composed so as to have a rib, flange, and/or bead fanned along the upper end  5   a  to lower end  5   b.    
     Moreover, a structure provided with a protruded portion at one end  5   a  as well as a fit-in hole formed to be able to fit in a protruded portion at the vehicle pillar inner panel A 5  enables the bracket  5  to be firmly attached to the vehicle and, in addition, to be prevented from bending due to the weight of the airbag  3 . Furthermore, a structure providing the bracket  5  with a temporary fixing clip of the airbag  3  supplied to the vehicle body becomes easy to be fastened and its strength is increased. 
     In the embodiment, the airbag  3  and bracket  5  are unified with both being fastened with a bolt and nut through the attachment hole  32  drilled in the attachment piece  31  of the airbag  3  and through-hole  51  at one end  5   a  of the bracket  5 . However, an attaching method of the bracket  5  to the airbag  3  is arbitrary and, for example as shown in  FIG. 5 , the airbag  3  and bracket  5  may also be unified by both being firmly fixed with a rivet through the attachment hole  32  of the airbag  3  and through-hole  51  at one end  5   a  of the bracket  5 . 
     In the embodiment, a case is described, in which work procedures to attach the airbag  3  to the vehicle pillar inner panel A 5  is to unity the airbag  3  and bracket  5  by attaching the former to the latter and then to attach the airbag  3  to the inner panel A 5 , thereby attaching the airbag  3  to the inner panel A 5 . However, unifying work of the airbag  3  and inner panel A 5  is not always needed in attaching the airbag  3  to the vehicle, so they may also be unified in advance.