Air bag device

#1. Field of the Invention

#The present invention relates to an air bag device to be mounted on a vehicle, and particularly to an air bag device in which a folded air bag is enclosed by a sheet for preventing the air bag from unfolding when in a non-deployed state.

#2. Description of Related Art

#FIG. 1 is a vertical section in the front-rear direction of a vehicle showing the condition of use of an air bag device for a passenger seat as an embodiment of the present invention, corresponding to I—I portion in FIG. 3;

#FIG. 2 is an enlarged vertical section of the same embodiment of FIG. 1;

#FIG. 3 is a vertical section in the left-right direction of the vehicle, showing the condition of use of the air bag device for a passenger seat in the same embodiment, corresponding to III—III portion in FIG. 1;

#Hereunder, an embodiment of the present invention will be described on the basis of the drawings.

#An air bag device M in the embodiment is an air bag device M for a passenger seat which is arranged in an instrument panel 1 in front of the passenger seat, as shown in FIGS. 1 through 3. The assistant seat air bag device M is constituted by a folded air bag 11, an inflator 36 for supplying the air bag 11 with expansion gas, a casing 39 for receiving and holding the air bag 11 and the inflator 36, a cover 53 for covering the folded air bag 11, two pressing members 51 for fixedly connecting the cover 53 to the casing 39, and a sheet 25 for preventing the air bag 11 from unfolding when in a non-deployed state.

#The air bag 11 is shaped like a bag having a rectangular opening 12 (see FIG. 8A) so as to make the expansion gas flow into the low portion of the bag, and the air bag 11 is formed from woven cloth of polyester, polyamide, or the like. A plurality of attachment holes 14 (the number of the holes is 6 in this embodiment) for attaching the air bag 11 to the casing 39 are formed in a peripheral edge 13 of the opening 12. The attachment of the air bag 11 to the casing 39 is performed by use of a rectangular and annular metal plate retainer 22 as shown in FIGS. 1 through 4. The retainer 22 has a plurality of bolts 22a extending downward (in the embodiment, three bolts are provided in each of opposite portions on front and rear sides of the vehicle). The respective bolts 22a are inserted into attachment holes 14 and through holes 44a of the casing 39. The peripheral edge 13 of the opening 12 is pressed by the retainer 22, and nuts 23 are thread-engaged with the bolts 22a so that the air bag 11 is connected to the casing 39.