JP2017196999A - Seat and air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat which sufficiently and stably protects a head of a seating person to inhibit twisting of a neck during an oblique collision.SOLUTION: A seat 1 includes: a seat back 11; and a head protection member 13 which is stored in a headrest 12 attached to the seat back 11 and is expanded to a front side by an impact to cover and protect a head B of a seating person A. The head protection member 13 is integrally formed so as to cover a front side, left and right sides, and an upper side of the head B when expanded, and an entire part of the head protection member 13 forms an air cushion 50.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a seat and an airbag apparatus.

  Conventionally, an air bag device is provided in front of a vehicle seat. This airbag device protects a seated person by expanding and bulging an airbag due to an impact at the time of a collision (see Patent Document 1).

JP2015-116912A

  However, there are cases where the seated person moves diagonally forward due to inertia in the case of an oblique collision. In this case, there may be a case where the head of the seated person is out of the protection area with the airbag and the head cannot be protected. Moreover, even if the seated person's head is marginally in the protection area with the airbag, the head collides obliquely with the airbag, so that a rotational force is applied to the head and the neck may be twisted.

  In Patent Document 1, the airbag is provided with a dither to suppress the rotation of the head, but depending on the position of the seat (the distance between the seated person and the airbag), the effect may not be obtained sufficiently.

  The present application has been made in view of the above points, and one of its purposes is to sufficiently and stably protect a seated person's head in an oblique collision or the like, and to suppress a neck twist.

  As a result of intensive studies, the present inventors have provided a head protection member that extends forward due to impact and covers and protects the seated person's head on the seat back or the headrest attached to the seat back. The head protection member is integrally configured to cover at least the front and the left and right sides of the head when deployed, and it is found that the above problem can be solved by providing a gas cushion at least in front of the head protection member. It came to complete.

That is, the present invention includes the following aspects.
(1) a seat back, a head protection member that is housed in the seat back or a headrest attached to the seat back, and that extends forward due to an impact to cover and protect the seated person's head; The head protection member is integrally configured to cover at least the front and the left and right sides of the head when deployed, and has a gas cushion at least in the front.
(2) The seat according to (1), wherein the head protection member is integrally configured to cover the front, left and right sides, and the upper side of the head.
(3) The seat according to (2), wherein the head protection member has a gas cushion at the front, side, and top of the head.
(4) The seat according to (1), wherein the head protection member is integrally configured so as to cover only the front side and the left and right sides of the head.
(5) The seat according to (4), wherein the head protection member includes a gas cushion in front and side of the head.
(6) The seat according to any one of (1) to (5), further including a mechanism in which the seat back tilts forward by applying a forward force greater than an allowable value to the seat back.
(7) An airbag apparatus comprising the seat head protecting member according to any one of (1) to (6) and an airbag provided in front of the seat.

  According to the present invention, the head of the seated person can be sufficiently and stably protected in the case of an oblique collision or the like, and the twisting of the neck can be suppressed.

It is a schematic diagram which shows an example of a structure of the sheet | seat of a normal time. It is the internal block diagram which looked at the headrest from back. It is a schematic diagram which shows the structure of the sheet | seat of the state which the head protection member developed. FIG. 4A is a perspective view of the head protecting member, and FIG. 4B is an explanatory view of a cross section of the head protecting member. It is a mimetic diagram showing composition of a sheet in the state where a seat back leans forward. It is explanatory drawing which shows an example of the frame | skeleton structure of a sheet | seat. It is an enlarged view around the connection part of the frame structure of a sheet. It is the schematic diagram which looked at the state where the head protection member contacted the airbag from the upper surface. It is the internal block diagram which looked at the seat back at the time of providing a head protection member in a seat back from back. FIG. 10A is a perspective view showing another example of the head protecting member, and FIG. 10B is an explanatory view of a cross section of another example of the head protecting member.

  The present invention will be specifically described below. In addition, the following embodiment is an illustration for demonstrating this invention, and this invention is not limited only to the embodiment. The same reference numerals are assigned to the same elements, and duplicate descriptions are omitted. In the drawings, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the illustrated ratios.

  FIG. 1 is a schematic diagram illustrating an example of the structure of the sheet 1 according to the present embodiment. The seat 1 includes, for example, a seat cushion (seat portion) 10, a seat back (backrest portion) 11, a headrest 12, a head protection member 13 accommodated in the headrest 12, and the like. A seat belt 14 is provided on the seat back 11.

  For example, the seat 1 in the present embodiment is a seat of a driver's seat of a vehicle. For example, a steering wheel 20 is disposed in front of the seat 1, and when an impact is detected on the steering wheel 20, the seat 1 side is disposed. An air bag 21 that expands and bulges is incorporated. In addition, sensors (not shown) for detecting an impact applied to the vehicle are provided on the front and the seat of the vehicle.

  As shown in FIGS. 1 and 2, the head protection member 13 is accommodated in the headrest 12, for example. As shown in FIG. 2, a gas supply device 30 is provided in the headrest 12. When an impact is detected by the sensor, the gas supply device 30 can eject gas to the head protection member 13 and expand and bulge an air cushion 50 as a gas cushion described later of the head protection member 13 forward. Note that the gas supplied from the gas supply device 30 to the head protecting member 13, that is, the internal atmosphere of the air cushion 50 does not necessarily need to be air, and may be another gas.

  The head protecting member 13 is made of resin, for example. As shown in FIG. 3, the head protection member 13 is formed so as to cover the entire head B of the seated person A and to have a substantially hemispherical dome shape with the lower side opened. For example, the head protection member 13 includes a front portion 40 that covers the front of the head B and a side portion 41 that covers the left and right sides of the head B, as shown in FIGS. The upper part 42 which covers the upper part of the head B is integrally provided. An integrated air cushion 50 is provided on the front portion 40, the side portion 41, and the upper portion 42. The air cushion 50 is filled with a gas 51. The rear end portions of the side portion 41 and the upper portion 42 are fixed to the headrest 12. The headrest 12 has a cleaving portion 60, and the head protecting member 13 protrudes from the cleaving portion 60 and expands.

  In the present embodiment, the head protection member 13 and the airbag 21 of the steering wheel 20 constitute an airbag device.

  Further, as shown in FIG. 5, the seat 1 has a mechanism in which the seat back 11 tilts forward when a forward force exceeding a predetermined allowable value is applied to the seat back 11. Hereinafter, an example of such a mechanism will be described.

  FIG. 6 shows an example of the skeleton structure of the sheet 1. The seat 1 has a seat cushion frame 70 and a seat back frame 71. The seat cushion frame 70 and the seat back frame 71 are connected via a connecting portion 72.

  A retractor 80 that winds up the seat belt 14 is attached to the seat back frame 71. The retractor 80 is configured to lock the seat belt 14 and prevent the seat belt 14 from being extended when a forward inertia acts on the seated person A due to a sudden deceleration of the vehicle such as at the time of a collision. As a result, a forward load applied to the seated person A is also applied to the seat back frame 71 via the seat belt 14.

  The connecting part 72 has a force limiter part 90. As shown in FIG. 7, the force limiter 90 includes a shaft 100 fixed to the seat cushion frame 70 side and a bracket 101 fixed to the seat back frame 71 side. The shaft 100 and the bracket 101 have cylindrical shapes with different diameters, and the shaft 100 is disposed in the bracket 101 so as to be coaxial with the bracket 101. The shaft 100 and the bracket 101 are fixed to each other by welding or the like, but the shaft 100 is configured to be plastically deformed and twisted around the axis when a rotational load exceeding an allowable value is applied. When the shaft 100 is twisted, the bracket 101 and the seat back frame 71 fixed thereto rotate around the axis. Therefore, when the seat back frame 71 is pulled forward by the seat belt 14 and a load greater than a predetermined allowable value is applied to the seat back frame 71 forward, the shaft 100 cannot endure and plastically deforms, and the seat back frame 71, That is, the seat back 11 tilts forward.

  Next, the operation of the seat 1 configured as described above will be described. First, as shown in FIG. 1, the head protection member 13 is accommodated in the headrest 12 at normal times. When an impact greater than a predetermined threshold is received due to an oblique collision of the vehicle or the like, the sensor detects this and the gas supply device 30 is activated, and the gas is supplied from the gas supply device 30 into the air cushion 50 of the head protection member 13. 51 is supplied. Then, for example, as shown in FIG. 3, the air cushion 50 expands and bulges to cover the entire head B of the seated person A, that is, the front, the left and right sides, and the upper side of the head B. In the steering wheel 20, the airbag 21 expands toward the seat 1 and bulges out.

  Then, the inertia toward the diagonally forward at the time of the diagonal collision acts on the seated person A, and when the seated person A moves diagonally forward, the seat belt 14 is pulled forward, and a forward load acts on the seat back 11. When the load exceeds the allowable value, the shaft 100 of the force limiter 90 is plastically deformed and twisted around the axis, and the seat back 11 tilts forward as shown in FIG. At the time of plastic deformation of the shaft 100, a part of the energy for the seated person A to move forward is consumed by inertia at the time of collision.

  When the seat back 11 tilts forward, as shown in FIGS. 5 and 8, the air cushion 50 of the front portion 40 of the head protecting member 13 hits the airbag 60 and tries to move forward of the seated person A (head B). The energy to be absorbed is absorbed by the air cushion 50 and the airbag 21 of the head protecting member 13.

  According to the present embodiment, the head protecting member 13 is configured integrally (no detachable part) so as to cover at least the front and left and right sides of the head B when deployed, and at least forward. A gas cushion 50 is provided. For this reason, the head protection member 13 is deployed forward by an impact at the time of a vehicle collision or the like, and integrally surrounds the front and left and right side surfaces of the head B of the seated person A. For this reason, for example, even if the seated person A moves diagonally forward due to a collision from an oblique direction, the head B does not jump out of the head protection member 13, so that the head B is reliably protected. Also, the head B is inside the head protection member 13, and the head B does not directly contact the airbag 21, so that the head hits the end of the airbag diagonally and the neck is twisted as in the past. No twisting of the neck can be suppressed. Further, the head B of the seated person A can be reliably protected regardless of the position of the seat 1 (the distance between the seated person A and the airbag 21).

  Since the head protection member 13 is integrally configured to cover the front, left and right sides, and the upper side of the head B, the head B of the seated person A can be reliably protected.

  Since the head protection member 13 has an air cushion 50 that covers the front, the left and right sides, and the entire upper side of the head B, the head B is reliably protected against a collision from any direction. It can be carried out.

  Since the head protecting member 13 is mounted on the seat 1 and the seat 1 has a mechanism in which the seat back 11 is tilted forward by applying a forward force greater than the allowable value to the seat back 11. Sometimes the seat back 11 tilts forward, and the head protection member 13 moves forward by that amount. For this reason, regardless of the position of the seat 1, the seat B of the seated person A can be reliably protected. Further, since the head B of the seated person A hits the airbag 21 via the air cushion 50 at the time of an oblique collision, it is possible to prevent the neck from being twisted when hitting.

  In the present embodiment, at least one of the side portion 41 or the upper portion 42 of the head protecting member 13 does not constitute the air cushion 50, and may be a belt-like body made of cloth material or rubber.

  In the above embodiment, the head protection member 13 is accommodated in the headrest 12, and when it receives an impact, the head protection member 13 jumps out of the headrest 12 and expands. However, as shown in FIG. It may be accommodated in the upper part. In such a case, the gas supply device 30 may also be built in the seat back 11.

  The head protection member 13 is integrally configured to cover the front, left and right sides and the upper side of the head B, but covers only the front and left and right sides of the head B (head) The upper part of the part B may be formed integrally. In this case, for example, as shown in FIGS. 10A and 10B, the head protecting member 13 has a front portion 130 covering the front of the head B and a side portion 131 covering the left and right sides. An air cushion 120 is provided on the front portion 130 and the side portion 131. The air cushion 120 is continuously formed in a belt shape around the front and side of the head B. Even in such a case, the head B can be reliably protected at the time of collision, and the twisting of the neck can be suppressed. Further, since the filling volume of the air 121 in the air cushion 120 is reduced, the deployment time of the air cushion 120 can be shortened.

  In the above embodiment, the side portion 131 of the head protecting member 13 does not constitute the air cushion 120 but may be a belt-like body made of cloth material or rubber.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  For example, the seat 1 described in the above embodiment is an example of a driver seat, but is not limited thereto, and may be applied to a passenger seat and a rear seat. The shape and size of the head protecting member 13 are not limited to this. The structure and shape of the cushion seat 10, the seat back 11, and the headrest 12 of the seat 1 are not limited to this, and the headrest 12 and the seatback 11 may be integrated. Although a mechanism in which the seat back 11 is tilted forward by applying a forward force exceeding an allowable value by the force limiter unit 90 is realized, a similar mechanism may be realized by other known configurations. The seat 1 of the present invention can also be applied to a general seat back without such a seat back forward tilt mechanism.

  The present invention is useful for sufficiently and stably protecting a seated person's head in an oblique collision and suppressing neck twisting.

DESCRIPTION OF SYMBOLS 1 Seat 11 Seat back 12 Headrest 13 Head protection member 21 Air bag 50 Air cushion A Seated person B Head

Claims (7)

Seat back,
A head protection member that is housed in the seat back or a headrest attached to the seat back and that extends forward due to impact and covers and protects the seated person's head;
The head protection member is configured to be integrated so as to cover at least the front and left and right sides of the head when deployed, and has a gas cushion at least in front of the seat.   The seat according to claim 1, wherein the head protection member is integrally configured to cover the front, left and right sides, and the top of the head.   The seat according to claim 2, wherein the head protection member has a gas cushion at the front, side, and top of the head.   The seat according to claim 1, wherein the head protecting member is configured integrally so as to cover only the front and left and right sides of the head.   The seat according to claim 4, wherein the head protecting member has a gas cushion in front and side of the head.   The seat according to any one of claims 1 to 5, further comprising a mechanism in which the seat back tilts forward when a forward force greater than an allowable value is applied to the seat back. A head protecting member for a sheet according to any one of claims 1 to 6,
An airbag device comprising: an airbag provided in front of the seat.

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