JP2001341611A - Child seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To actuate an air bag on the child seat side prior to an air bag on the car body side at the time of collision for receiving the head part of a child, and prohibit the back part of the head of the child to impact on a backrest by reaction. SOLUTION: This child seat is provided with a first air bag assembled in a safety bar connected to the child seat on which a child is seated to be expanded from a diagonally upward directed upper surface to receive the face of the child downward at the time of collision, and a second air bag at an upper part of a backrest of a seat part to be expanded upward by reaction of collision to receive the back part of the head of the child. A sensor to start the air bags is built in the seat part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a child seat for protecting a child seated in response to a forward lean and a swing back during a vehicle collision.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Utility Model Publication No. 3059973, an airbag is inflated forward of a seat from a safety bar for holding a child's waist, so that the height of the chest when the child's neck falls down is reduced. A child seat that protects a child from the impact of a collision with an airbag inflated to a position is disclosed. Then, a power supply and a sensor signal are supplied from the vehicle body side of the automobile. By deploying another airbag toward the front seat at, for example, one lower portion of the four upper, lower, left, and right sides of the child seat, forward movement is controlled so that an excessive G load is not applied to the child's body.

[0003]

The above prior arts have the following problems. (1) Since the collision detection depends on a sensor on the vehicle body side, the activation timing of the airbag is not always the optimal timing for reducing obstacles for children. Does not match. (2) If the vehicle interior dimensions are different for each vehicle type, and if the front seat can be adjusted for the front / rear position even after the inclination angle of the seat bag or the second row seat, the air bag and the separate air In some cases, an appropriate protrusion size of the bag may not be obtained. (3) To restrain the head by the airbag coming out of the safety bar, it is necessary to tilt the upper body forward and bend the neck forward. (4) When rebounding the child seat inclined forward, there is a possibility that a burden is applied to the neck. In particular, since the child seat is mounted on the seat cushion, the child seat itself swings particularly on the seat cushion in a collision. That is, the child restrained by the child seat moves differently from the adult restrained by the belt, which may cause the above-described situation. There is a problem that.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and is incorporated in a safety bar connected to a child seat on which a child sits, and expands downward from an upper surface facing obliquely upward. A seat is provided with a first airbag, a second airbag inflated above a backrest of the seat, and a built-in sensor for activating the airbag in the seat.

That is, a sensor and a start-up circuit for detecting a collision are incorporated in the child seat, and the movement unique to the child seat in the collision is appropriately determined to deploy the first bag early. This deployment time is generally before the activation timing of the airbag of the vehicle body. The first bag is incorporated into the safety bar and is placed in front of the child in advance. This first bag starts to expand diagonally upward,
The child seat expands in a U-shape and extends at least below the height of the seat surface of the child seat. With such a shape, the position of the airbag is determined by hitting the front side of the seat portion of the child seat or the seating surface of the car seat, thereby reducing the impact of the child. Thus, the back of the child hits the back of the child seat in the reaction of the collision, but the second bag is arranged and activated at an appropriately delayed time to mitigate the impact. Can be improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to one embodiment shown in FIGS. FIG.
Fig. 1 schematically shows a part of a cabin of a typical passenger car. The front seat 1 faces an instrument panel on the left side of the figure where the airbag device is mounted. Backrest part 1
b is a seat 1a and a hinge, the inclination angle of which can be adjusted within a predetermined range, and the seat 1a can be adjusted in the front-rear direction by a base 1c. The rear seat 2 includes a seat portion 2a and a backrest portion 2b, and the front-rear position and the inclination angle are constant. That is, it has no variable structure. The child seat 10 is mounted on the rear seat 2 by a rear seat belt, an Isofix bar, or the like. The child seat 10 is substantially composed of a child seat main body 11 and a safety bar 12. A seat 11a of the child seat main body 11 has an airbag sensor 15a for reducing damage to a child, and an airbag 21.
and a delay circuit 15b for deploying the airbag 22a at a predetermined interval with respect to the airbag 21a is provided in the backrest 11b.

The details of the airbag modules 21 and 22 for inflating and deploying the airbags 21a and 22a are shown in FIGS.
Respectively. The airbag module 21 is incorporated in a columnar cushion 12a of the safety bar 12. The surface is made of a high-foam rubber pad 3 having a rupturable cloth 31 and a transversely extending groove 32a.
2. Inflator (gas generator) having an airbag 21a folded in a tubular shape and having a plurality of gas injection ports 33a in a tubular shape.
Is built in. The safety bar 12 is connected to the child seat body 11 by an arm 12b formed by extruding aluminum or the like so that the angle and length of the arm 12b can be changed.
After the child is seated, restrain the child according to the belt position. The airbag 21a has the outer shape schematically shown in FIG. 5 in the deployed shape. It has an upper part (A), a front part (B), left and right side parts (C), a lower part (D), and a mounting part (E), so that the upper and lower parts A and D and the front and lower parts B and D are in contact with each other. As shown by the dashed line in FIG. 5, it is folded in a “G” shape to form a base portion F and upper and lower extending portions G and H (FIG. 6A). The extension portions G and H are folded into a waveform (FIG. 6).
(B)) Finally, the base portion F is rolled so as to cover the outside of the extending portion H (FIG. 6C).

The airbag module 22 is shown in FIG. 4, and a cover 35 made of a thermoplastic elastomer is broken by a tear line 35a (dashed line) to form an airbag module 22a.
(Two-dot chain line) to reduce the bag capacity and to make the basic structure the same as that of a known airbag device built in a steering wheel pad.

In the event of a vehicle collision, the airbag sensor 15
a is transmitted to the safety bar 12 and the airbag modules 21 and 22 installed on the backrest 11b of the child seat and the airbag 21
a, 22a expand and deploy. The start timing is shown in FIG. The airbag 21a deployed from the safety bar 12 to T1 is located between the backrest 1b of the front seat 1 and the rear seat 2, and restrains the head j of the child i. Airbag 21
At T2, which is delayed by several tens of milliseconds by the delay circuit 15b after a is deployed, an operation signal is transmitted to the airbag module 22 in the backrest 11b, and the airbag 22a is deployed. Tv in FIG. 2 is the activation timing of the airbag provided in the center pad of the steering wheel or the instrument panel. The activation timing T1 of the airbag 21a is slightly earlier than Tv, and when the head j of the child i tilts forward, the airbag 21a that expands diagonally upward and forward obtains a desired deployment shape before greatly tilting forward. It is. When a start signal is received from the vehicle body side, it is possible to activate the child seat side airbag at the same time as receiving the start signal or at a predetermined interval thereafter, but it is necessary to deploy it before the vehicle side airbag. Can not. Therefore,
There is significant significance in incorporating sensors into the child seat itself. In addition, there is a problem in that the child seat is frequently attached and detached, and there is a problem in connection reliability in a structure that receives a signal from the vehicle body side, and thus there is a concern about structural complexity and cost. However, in the present embodiment, such a problem is not related. The sensor may be a common electric sensor or a mechanical sensor that detects sudden deceleration by the movement of a built-in weight.

FIGS. 7 to 10 show modified examples, which show an airbag 40 in the form of an air pillow, which is another form of the airbag used in the airbag module 22. FIG. FIG. 7 shows the base fabric panels 41 and 42 made of a woven fabric coated with a filler coating with a thermoplastic polyurethane resin or the like.
As shown in FIG. 8, the heat-welded portion has a sufficient capacity at the central portion during the development as shown in FIG. 8. The mounting through holes 41b and 42b are fixedly accommodated in the backrest portion 11b together with the gas generator 33 'by riveting as shown in FIG. 9, and swell to break the cross on the surface.

[0011]

According to the present invention, there is provided a first airbag which is incorporated in a safety bar connected to a child seat on which a child sits, and which inflates downward from an upper surface facing obliquely upward to receive the upper body of the child in a collision. The upper backrest of the seat is provided with a second airbag that inflates to receive the child's occipital region due to the recoil of the collision, and the seat has a built-in sensor for activating the airbag. It can be widely used in various passenger cars. The desired restraint performance can be exhibited without being affected by factors that normally change, such as the arrangement, position and angle of the seat. In the child seat mounted on the vehicle body seat, the child's head restrained by the child seat swinging on the flexible cushion of the seat surface swinging by the collision can sufficiently protect the occipital region when the child swings back, and in the event of a secondary collision The performance of preventing or mitigating obstacles can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a part of a cabin of a typical passenger car.

FIG. 2 shows activation timings T1,
It is a figure which shows T2.

FIG. 3 is an external perspective view of an airbag module for operating the airbag 21a.

FIG. 4 is an external perspective view of an airbag module for operating the airbag 22a.

FIG. 5 is an external perspective view of a deployed shape of the airbag 21a.

FIG. 6 is a diagram showing the folding of a, b, and c airbags.

FIG. 7 is an external perspective view of a base fabric panel of another embodiment of the airbag module.

FIG. 8 is an external perspective view of a central portion of the developing device shown in FIG.

FIG. 9 is a partial sectional view of a backrest.

10 is an external perspective view in which the outer periphery of FIG. 7 is thermally welded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front seat 1a Seat 1b Backrest 1c Base 2 Rear seat 2a Seat 2b Backrest 10 Child seat 11 Child seat main body 12 Safety bar 12b Cylindrical cushion 12b Arm 15a Airbag sensor 15b Delay circuit 21 Airbag module 21a Airbag 22 Airbag module 22a Airbag 31 Breakable cloth 32 Pad 32a Expected groove 33 Diffuser housing 33 'Gas generator 40 Airbag 41,42 Base fabric panel 41a Folding line 41b, 42b Through hole

Claims (1)

[Claims] 1. A first airbag incorporated in a safety bar connected to a child seat for seating a child, inflating downward from an upper surface facing obliquely upward to receive the face of the child in a collision, and a seat back. A child seat including a second airbag inflated to receive a child's occipital region by a recoil of a collision, and a sensor for activating the airbag in a seat portion.