Lid of an air bag device for a passenger

A lid covers an opening of a container accommodating an air bag in a folded form. Upon development of the air bag, the lid pushed by the air bag is partially or fully rotated in a door-like form. The lid has a portion, which is located near a tip end of the lid during rotation and contacts a windshield of a vehicle. The lid is provided with a linear bendable portion, which enables rearward bend, in view of a rotating direction, of the portion near the tip end of the lid.

FIELD OF THE INVENTION 
The present invention relates to an air bag device for a passenger which is 
provided in an instrument panel of a passenger's seat of an automobile for 
protecting the passenger upon collision of the vehicle, and in particular 
relates to an improvement of a lid of the same. 
DESCRIPTION OF THE RELATED ART 
FIG. 8 shows a schematic structure of an air bag device for a passenger. An 
instrument panel 10' is provided with an opening 14' for mounting an air 
bag device 12' for a passenger. A lid 16' of the air bag device 12' is 
disposed in the opening 14'. The air bag device 12' includes a container 
18' having a front opening, which is covered with a plate of the lid 16', 
an air bag 20' which is accommodated in a folded form in the container 
18', and an inflator 22' serving as a gas generator for developing the air 
bag 20. The lid 16' is provided at the rear surface of the plate with 
attachment pieces 24' and 26', which are attached to the container 18'. At 
28' is indicated a windshield of the automobile. 
Upon collision of the automobile, the inflator 22' operates to generate 
gas. Thereby, the air bag 20' starts to inflate. The inflating air bag 20' 
pushes the lid 16' to rotate and open the same around a position at or 
near the attachment piece 26' as indicated by alternate long and two short 
dashes in FIG. 8, and the air bag 20' largely develops into a cabin or 
interior space of the vehicle. 
According to the lid 22' of the air bag device for the passage in the prior 
art described above, a range for rotation of the lid 22' is restricted due 
to contact of the tip end of the lid 22' with the windshield 28'. 
OBJECT AND SUMMARY OF THE INVENTION 
The present invention provides a lid of an air bag device for a passenger, 
wherein the lid covers an opening of a container accommodating an air bag 
in a folded form, and is adapted to be pushed by the air bag during 
development to partially or fully rotate and open in a door-like fashion, 
to wherein a portion of the lid, which forms a tip end portion and 
contacts a windshield of an automobile in a rotating operation, is 
bendable rearwardly in a direction of rotation of the lid. 
According to the lid of the air bag device for the passenger according to 
the invention, the air bag develops to open the lid. In this operation, 
when the tip end of the lid contacts the windshield, the tip end portion 
bends in the rearward direction in view of the rotating direction. 
Therefore, the lid continues to rotate even after the contact, and thus 
opens to a large extent.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Embodiments of the invention will be described below with reference to the 
drawings. FIGS. 1, 2 and 3 show a lid of an air bag device for a passenger 
of a first embodiment of the invention. In this embodiment, a passenger 
seat is arranged at a left position in an automobile, in view of a running 
direction of an automobile, and a driver's seat is arranged at a right 
position. In front of the passenger's seat, there is arranged an 
instrument panel 10 in which an air bag device 12 for the passenger is 
provided. 
In this embodiment, a lid 16A has a left side portion 16L, which is 
provided at a position near its tip end with a bendable portion 30. In 
this embodiment, the lid 16A is formed of an inner layer 32 made of hard 
synthetic resin and an outer layer 34 made of soft synthetic resin. The 
bendable portion 30 is formed of a groove provided in the inner layer 32. 
Other portions and structures of the air bag device 12 for the passenger in 
FIG. 1 are the same as those in the foregoing prior art shown in FIG. 8, 
and thus bear numerals similar to those in FIG. 8 without primes. 
In the air bag device 12 having the lid 16A thus constructed, when an 
inflator 22 is activated due to collision of the automobile, an air bag 20 
pushes the rear side of the lid 16A to rotate and open it around a 
position of or near an attachment piece 26, as shown in FIG. 3. As shown 
also in FIG. 1, the left side 16L of the lid is nearer to a windshield 28 
than a right side 16R. Therefore, the tip end portion of the left side 16L 
first contacts the windshield 28 when the lid 16A rotates in the opening 
direction. Thereby, the left end portion bends around the bendable portion 
30, as shown in FIG. 3. Therefore, the lid 16A rotates to a larger extent, 
as compared with the prior art, and thus the air bag 20 quickly develops 
into the room. 
Although the foregoing embodiment is provided with the bendable portion 30 
formed of the groove, the inner layer 32 may be recessed along the 
bendable portion 30, as shown in FIG. 4, and the recessed portion may be 
filled with the soft synthetic resin forming the outer layer 34. In the 
case where a lid 16B has the bendable portion 30 shown in FIG. 4, a 
portion 100 located between the tip end and the bendable portion 30 may 
deform when the portion 100 is pushed. In this case, therefore, it is 
preferable to dispose the instrument panel 10 under the end portion 100, 
as shown in FIG. 4. In this structure, the end portion 100 does not deform 
downward even when an upper surface thereof is pushed downward. 
FIGS. 5 and 6 are a plan and a cross section showing a lid of another 
embodiment of the invention, respectively. A lid 16C of this embodiment 
includes a reinforcement plate 40, e.g., of aluminium which is embedded 
therein. In this embodiment, the reinforcement plate 40 is provided with a 
plurality of apertures 42 arranged in a row for forming a bendable portion 
44. In the operation of the air bag device having this lid 16C, when an 
end portion 200 located between the apertures 42 in row and the tip end 
contacts the windshield, the end portion 200 of the lid 16C bends rearward 
in view of the rotating direction, which is similar to the operation in 
FIG. 16C. 
The aperture 42 may be of a circular shape, and also may be of an 
elliptical, rhombic, lens-like or hexagonal shape. In the case of the 
elliptical, rhombic or lens-like shape, it is desirable to dispose the 
apertures so that the major axes thereof extend along the direction of the 
row of apertures. 
Although the bendable portion 44 is formed of the row of apertures 42 in 
the embodiment in FIG. 6, the invention may have a structure shown in FIG. 
7. In the figure, a reinforcement plate 40A is provided with a stepped 
portion 46. When an end portion located between the stepped portion 46 and 
the tip end contacts the windshield 28, a bending stress concentrates in 
the stepped portion 46, so that the lid bent at the stepped portion 46. 
The apertures 42 or stepped portions 46 may be arranged in multiple rows, 
as shown in FIGS. 9 and 10, in which case a higher effect can be achieved. 
The stepped portions may have a V-shaped section, as shown in FIG. 10, or 
may have a U-shaped section. 
According to the lid of the air bag device for the passenger, as described 
hereinabove, when the lid is rotated in the opening direction in 
accordance with the activation of the air bag device and contacts the 
windshield, the tip end portion of the lid contacting the windshield bends 
rearward in view of the rotating direction. Therefore, the lid continues 
to rotate and thus opens to a large extent. Accordingly, the air bag 
quickly develops into the cabin of the vehicle.