JP2507839Y2 - Gas bag cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a gas bag cover body for protecting an occupant from an impact such as a collision in an automobile or the like.

(Prior Art) In automobiles, a gas bag device is known which protects an occupant from an impact such as a collision.

As shown in FIG. 5, this gas bag device covers a gas bag 1 in a folded state with a cover body 2 made of a soft synthetic resin, and causes gas to flow into the gas bag 1 by a shock such as a collision to expand the gas bag 1. During the expansion, the pressure of the gas bag 1 causes a part of the cover body 2 to be broken along the breaking line, so that the gas bag 1 is projected from the cover body 2. It prevents the occupant from colliding with the rim of the steering wheel and the glass in front of the occupant and absorbs the impact.

The breaking line of the cover body 2 is, for example,
As described in 63-201862, the cover body 2
By forming the fractured groove 3 in an H shape on the back surface of the H, a thin portion 4 that is fractured by the expansion of the gas bag 1 is formed. The upper and lower sides of 4 are opened like doors by the expansion of the gas bag 1.

Further, reinforcing nets 5 are insert-molded on both sides of the thin portion 4 to prevent breakage of a portion other than the thin portion 4 when the cover body 2 is broken, and the cover body 2 is finely broken and scattered. The structure is adopted to prevent this.

(Problems to be Solved by the Invention) In the cover body of the above-described conventional gas bag device, the cover body 2 of the gas bag 1 receives pressure from the folded gas bag 1 even in a normal state. The thin portion 4 of the breaking line is raised, and particularly, the cover body 2 is raised around the straight thin portion 4 passing through the central portion, which is visually unsightly and gives a feeling of strangeness to the touch, so that the breaking line is conspicuous. To prevent it from happening, it is designed.

In this respect, for example, as described in Japanese Utility Model Laid-Open No. 51-25342 or Japanese Utility Model Laid-Open No. 48-81533, a structure in which a breaking line having a thin portion is bent or gently curved is known. However, even in these configurations, there is a problem that the cover body rises along the break line and the appearance is deteriorated.

The present invention has been made in view of the above circumstances, and provides a cover body for a gas bag in which a strong bulge is suppressed from appearing at the break line of the cover body.

(Means for Solving the Problems) The present invention comprises a soft synthetic resin which covers a gas bag which is normally in a folded state and expands due to the inflow of gas, and which is broken along a breaking line by the expansion of the gas bag. In the cover body, the breaking line has a thin portion formed by forming a breaking groove on the back surface, and a part of the thin portion is meandered in the longitudinal direction of the breaking line.

(Operation) In the cover body of the gas bag of the present invention, a part of the thin portion meanders in the longitudinal direction of the breaking line, so that the pressure from the folded gas bag causes the meandering thin portion to meander. Along the ridge, the ridges are alternately dispersed on both sides of the rupture line, and strong swelling on the cover body is suppressed.

(Embodiment) The construction of one embodiment of the gas bag cover of the present invention will be described with reference to the drawings.

FIG. 3 shows a plan view of a steering wheel of an automobile. This steering wheel is provided with a boss portion 13 at a central portion of an annular rim portion 11 via a plurality of spoke portions 12, and the boss portion 13 is As shown in FIG. 4, it has a metallic cylindrical boss 14 which is fitted and fixed to a steering shaft of an automobile (not shown), and a metallic boss plate 15 is fixed to the upper portion of the boss 14 by welding. ing.

A gas bag device 20 is arranged above the boss portion 13. In this gas bag device 20, a base plate 21 is mounted on the boss plate 15 via a mounting means (not shown), and a circular opening 24 of the gas bag 23 is provided on the periphery of the circular opening 22 of the base plate 21. The peripheral portion of is fixed by an annular fixing plate 25 and a plurality of fixing members 26 such as rivets and screws.

Further, in this gas bag device 20, the gas generator 30 is arranged in the opening 22 of the base plate 21, and the flange portion 31 on the outer periphery of the gas generator 30 is located below the peripheral portion of the opening 22 of the base plate 21. It is fixed by the fixing device 26.

The gas bag 23 is arranged in a folded state, and the gas generator 30 located inside the gas bag 23 is disposed.
A plurality of outlets 32 for blowing out gas are provided in the upper part of the.

Further, in this gas bag device 20, a cover body 35 for covering the gas bag 23 is provided on the outer peripheral edge of the base plate 21.
Has been fixed. This cover body 35 is a base plate
The tubular portion 36 fixed to the column 21 and the flat plate portion 37 that closes the upper portion of the tubular portion 36 are integrally molded of a soft synthetic resin having elasticity such as urethane foam.

The flat plate portion 37 of the cover body 35 is provided with a break line 39 having a substantially H-shaped plane as shown in FIGS. 3 and 1. That is, the flat plate portion 37 of the cover body 35
A fractured groove 40 having a substantially U-shaped cross section is formed in a substantially H-shaped shape on the back surface of the cover body 35 by the fractured groove 40.
A horizontal thin portion 41 passing through the central portion thereof and thin thin portions 42 on both sides extending in the up-down (front-rear) direction passing through both ends of the horizontal thin portion 41 are formed in an H shape. ing.

Then, among the thin-walled portions 41 and 42 of the flat plate portion 37 of the cover body 35,
Thin-walled part 41 whose longitudinal direction is the left-right direction passing through a part of the central part
As shown in FIG. 1 and FIG. 2, the breaking groove 40 is alternately bent and meandered with respect to the breaking line 39 which is a virtual straight line whose longitudinal direction is the left-right direction, This break line
It is designed to cross 39 at regular intervals.

A reinforcing net 43 is integrally embedded in the cover body 35 by insert molding at both sides of the thin portions 41 and 42.

 Next, the operation of this embodiment will be described.

With such a configuration, an impact sensor (not shown) is activated due to a collision of a car, and the gas generator is activated.
Gas is rapidly released from the inside of the gas bag 23 from 30, and the gas bag 23 is rapidly inflated by this gas. , 42 are broken, the upper and lower both sides of the central thin portion 41 are opened like doors, the gas bag 23 is projected from the cover body 35 and deployed toward the driver, and by this deployed gas bag 23, the driver Prevents the vehicle from colliding with the rim portion 11 of the steering wheel and the glass in front, and
It absorbs the impact of a collision.

Further, when the gas bag 23 is deployed, since the reinforcing nets 43 are embedded in both sides of the thin portion 41 at the center of the cover body 35, it is sure that breakage will occur in places other than the thin portions 41 and 42. Therefore, it is possible to reliably prevent the scattering of fragments at the time of breakage.

Then, in a normal state, the cover body 35 receives pressure from the folded gas bag 23, and tends to bend and bulge at the portion of the break line 39 formed weaker than other portions, but the bulging is likely to stand out. Break line in the center
Regarding 39, since the thin portion 41 is meandered in the longitudinal direction of the rupture line 39 so that the pressure from the folded gas bag 23 is alternately dispersed on both sides of the rupture line 39, the cover body
No strong linear rise appears in the center of 35.

(Effect of the Invention) According to the present invention, since a part of the thin wall portion is meandering with respect to the breaking line of the cover body of the gas bag, the pressure from the folded gas bag is applied to the meandering thin wall portion. Dispersed alternately on both sides of the break line along. Therefore, on the surface of the cover body, it is possible to suppress the appearance of strong swelling, in particular, it is possible to suppress the appearance of a straight swelling, it is possible to improve the appearance, without giving a sense of incongruity tactile, It is also possible to omit design processing.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a gas bag cover of the present invention, FIG. 2 is a sectional view of a thin portion meandering above, and FIG.
FIG. 4 is a plan view of a steering wheel equipped with the same gas bag device as above, FIG. 4 is a sectional view of the same as above, and FIG. 5 is a sectional view of a part of a conventional gas bag cover. 23 …… gas bag, 35 …… cover body, 39 …… break line, 40
...... Broken groove, 41, 42 ...... Thin-walled part.

Claims (1)

(57) [Scope of utility model registration request] 1. A cover body made of a soft synthetic resin which covers a gas bag which is normally folded and expands by the inflow of gas, and which is broken along the breaking line by the expansion of the gas bag, wherein the breaking line is A cover body for a gas bag, characterized in that it has a thin portion having a fracture groove formed on its back surface, and a part of the thin portion is meandered in the longitudinal direction of the fracture line.