JP2002012072A - Seat for moving body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat for a moving body that can absorb forward or backward impact. SOLUTION: This seat 1 has seat cushion frames 10 extending along the side edge parts of a seat cushion 2, and seat back frames 12 extending along the side edge parts of a seat back 3. The seat 1 is provided with a seat belt device supporting the upper part of a shoulder belt by the seat back 3. An impact absorbing part 16 plastically deformed when forward or backward moment of specified value or more is generated to the seat back 3, to allow the forward rotation of the seat back is provided near the rear part of each seat cushion frame 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat for a moving body such as an automobile, and more particularly to a seat for a moving body having a seat belt device, the upper portion of a shoulder belt of the seat belt device being supported by the seat back.

[0002]

2. Description of the Related Art Usually, as a seat of a moving body such as an automobile,
A vehicle equipped with a seat belt device for protecting an occupant sitting on the seat is widely used.

[0003] As a seat of a moving body provided with such a seat belt device, for example, in a seat of an automobile, in the seat belt device, an upper portion of a shoulder belt supporting an occupant's upper body is a seat such as a side pillar of a vehicle body. And those supported on separate rigid parts via anchors,
It is known that the upper portion of the shoulder belt is supported by a seat back of a seat.

[0004] In an automobile seat equipped with such a seat belt device, the occupant is seated, the seat belt is worn, and the shoulder belt is pulled out along the front surface of the occupant's upper body. When it is
During traveling of the vehicle, particularly when the vehicle body suddenly decelerates due to a collision from the front, etc., the occupant moves forward with an extremely large impact force due to the inertial force and leans on the shoulder belt. At this time, if the upper portion of the shoulder belt is supported by a side pillar or the like of the vehicle body, the shoulder belt is locked by a side pillar or the like having sufficient strength to resist the impact force from the occupant, The occupant's upper body can be firmly held down and its forward movement can be reliably prevented.

On the other hand, when the upper portion of the shoulder belt is supported by the seat back, the upper portion of the shoulder belt is locked by the seat back, thereby pressing down on the occupant's upper body and preventing its advance. Will be.

[0006]

In the seat provided with the seat belt device in which the upper portion of the shoulder belt is supported by the seat back, when the occupant leans on the shoulder belt as described above, A very large tension is applied to the shoulder belt due to the impact force, and the seat back supporting the upper portion of the shoulder belt is strongly pulled forward by the tension. As a result, a strong moment is generated in the seatback in the forward leaning direction about the pivotal portion of the reclining mechanism of the seatback or the portion connected to the seat cushion below the seatback. Further, the seat back is connected to the rear end portion by the tension, and the seat cushion is installed on the floor surface of the vehicle body via the locking member. A large moment acting to peel off from the substrate.

Therefore, in order to ensure that the seat is securely supported by the seat back by the seat back, and that the shoulder belt surely presses the occupant to prevent the occupant from moving forward, the frame forming the frame of the seat and the frame. The pivot portion of the reclining mechanism and the locking member for installing this seat on the floor of the vehicle body are configured to have very high strength.

Further, as a seat belt retractor having a function of feeding and winding a shoulder belt,
In the event of an emergency such as a vehicle collision, the seat belt retractor having a mechanism for preventing the extension of the shoulder belt and absorbing a tension greater than a predetermined value in the extension direction of the shoulder belt in this state is applied to the seat belt. Installed on the back, which prevents a large moment from being generated in the seat back and the seat cushion by absorbing the tension applied to the shoulder belt when the shoulder belt receives the occupant as described above by this seat belt retractor Is also known.

[0009] However, in the case of such a configuration, the weight and the whole volume of the seat are both increased, and the seat tends to be expensive, which is not preferable.

The present invention provides a mobile seat having a seat belt device in which an upper portion of a shoulder belt is supported by a seat back, which can be manufactured at low cost without increasing the weight of the seat. The first purpose is to do so.

By the way, a conventional vehicle seat is configured so as not to rotate backward in the event of a collision. The present invention
A second object of the present invention is to provide a seat of a moving body that can be plastically rotated rearward at the time of a collision to absorb a shock.

[0012]

According to a first aspect of the present invention, there is provided a moving body seat, wherein the upper portion of a shoulder belt of a seat belt device is supported by a seat back, and the side of a seat cushion is provided. A seat cushion frame present along a side portion, and a seat extending along a side portion of the seat back, and a lower portion rotatably connected to a rear portion of the seat cushion frame by a rotatable connecting member. In a mobile seat having a back frame,
At least one of the rear portion of the seat cushion frame, the lower portion of the seat back frame, and the rotation connecting member is plastically deformed when a predetermined forward moment or more is generated with respect to the seat back, and the seat back is deformed. It is characterized in that an impact absorbing portion that allows forward rotation is provided.

The seat of the moving body according to the present invention is applied as a seat of an automobile or the like. And, for example, while the vehicle is running,
When the occupant sits in this seat, the seat belt is worn, and the shoulder belt is pulled along the front of the occupant's upper body, if the vehicle body suddenly decelerates due to a collision from the front of the vehicle, The occupant leans on the shoulder belt with a very large impact force, and strong tension is applied to the shoulder belt. Since the upper part of the shoulder belt is supported by the seat back of the seat, the tension strongly pulls the seat back forward, and the shoulder back is connected to the lower part of the seat cushion or A forward moment is generated around a rotation connecting member that rotatably connects the seat back and the seat cushion.

In the seat of the moving body according to the present invention, when the moment becomes a predetermined value or more, the seat is provided near the rear portion of the seat cushion frame, near the lower portion of the seat back frame, or on the rotation connecting member. The impact absorbing portion plastically deforms so as to allow the seat back to rotate forward. As a result, the seat back gradually leans forward while receiving the drag caused by the deformation of the shock absorbing portion, and the tension of the shoulder belt, which generated a moment in the seat back,
As a result, the impact force from the occupant who applied tension to this shoulder belt is absorbed.

[0015] In the seat of the moving body of the present invention provided with such a shock absorbing portion, the strength of the frame or the like constituting the skeleton does not need to be excessively increased, and the shoulder belt is fed out and wound up. The seat belt retractor only needs to have a function of preventing the extension of the shoulder belt in a normal emergency, so that an increase in the weight and volume of the seat can be suppressed and the seat belt retractor can be manufactured at low cost.

It is preferable that the seat of the moving body of the present invention is provided with a stopper for restricting the amount of deformation of the shock absorbing portion.
As a result, the seat back is prevented from excessively leaning forward, and the upper body of the occupant can be prevented from protruding significantly forward due to the forward tilt of the seat back.

The seat of the moving body according to the present invention (claim 2) is a seat of the moving body in which the upper portion of the shoulder belt of the seat belt device is supported by the seat back, and exists along the side of the seat cushion. Having a seat cushion frame extending along a side portion of the seat back and a lower portion rotatably connected to a rear portion of the seat cushion frame by a rotation connecting member. In a body seat, when at least one of the rear portion of the seat cushion frame, the lower portion of the seat back frame, and the rotation connecting member, a moment more than a predetermined rearward moment is generated with respect to the seat back, plastic deformation occurs. And a shock absorbing portion for allowing the seat back to rotate rearward is provided.

In the seat of such a moving body, when a large acceleration is applied from behind, such as at the time of a vehicle collision, the seat back pivots backward and plastically absorbs an impact. Is done.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a transparent perspective view of an automobile seat as a seat of a moving body according to an embodiment of the present invention, and FIG. 2 is an explanatory view showing a structure of a shock absorbing portion of the seat. . 2, (a) is an enlarged view of the shock absorbing portion of the seat of FIG. 1, (b) is a cross-sectional view taken along line BB of (a), (c) The figure is a cross-sectional view of the same portion as FIG. (B) in a state in which the sheet is plastically deformed by a moment applied to the seat back.

The vehicle seat 1 includes a seat cushion 2 disposed on a vehicle floor, a seat back 3 extending upward from a rear end of the seat cushion 2, and an uppermost portion of the seat back 3. And a headrest 4 connected so as to be adjustable in height. The seat 1 also includes a seat belt device (not shown) for protecting an occupant sitting on the seat 1, and an upper portion of a shoulder belt of the seat belt device is supported by a seat back 3.

The seat cushion 2 is provided with a seat cushion frame 10 along the side.
The seat back 3 is provided with a seat back frame 12 along the side edge, similarly to the seat cushion 2. The lower portion of the seat back frame 12 is connected to a rotation connecting member 14.
The lower portion is rotatably connected to the seat back support portion 10a on the rear end side of the seat cushion frame 10 via the. The rotation connecting member 14 rotates so as to tilt (recline) the seat back frame 12 forward and rearward about the rotation connecting member 14 as a rotation center, and also fixes the seat back frame 12 to the seat cushion frame 10. It can be fixed at an arbitrary angle with respect to. The seat back 3 always reclines in the seat longitudinal direction integrally with the seat back frame 12.

Since the upper portion of the shoulder belt of the seat belt device is supported by the seat back 3, the shoulder belt follows the reclining posture of the seat back 3 and is always in close contact with the front surface of the occupant's upper body. It can be routed so as to be suitably arranged. As a result, the shoulder belt is always in a position above the occupant when the seat belt is worn even in a state where the seat back 3 is reclined at any angle in an emergency such as a vehicle collision or the like, particularly in a collision from the front of the vehicle. The body can be held down and restrained by the seat back 3.

The shoulder belt has one end connected to a seat belt retractor (not shown). The seat belt retractor has a very general configuration, and has a reel (not shown) around which one end of the shoulder belt is wound, and the reel is rotated to feed out and wind the seat belt. Picking is performed.

The seatbelt retractor senses the impact of a vehicle collision and the fact that the upper body of the occupant moves forward so as to lean on the shoulder belt due to the collision, whereby the shoulder belt is suddenly extended and the reel is retracted. (To prevent the reel from rotating in a direction allowing the extension of the shoulder belt), and to increase the length of the shoulder belt routed to the front of the occupant in an emergency such as a collision. To prevent. As a result, the shoulder belt is not extended excessively even when the occupant leans on the shoulder belt with an extremely large impact force in an emergency such as a vehicle collision, and quickly presses the upper body of the occupant. , Can be restrained by the seat back 3.

A portion of the rear portion of the seat cushion frame 10 near the front edge of the seat back support portion 10a is plastically deformed when a forward moment exceeding a predetermined value is generated with respect to the seat back 3, and the seat back 3 is deformed plastically. Is provided with an impact absorbing portion 16 that allows the front side to rotate forward.

The shock absorbing portion 16 is composed of a plurality of pleated portions 16a extending from the upper side to the rear side of the lower side of the seat cushion frame 10 and continuous with each other. As shown in FIG. 2 (b), each of the folds 16a is formed in a bellows shape in a substantially front-rear direction of the seat cushion frame 10 (a direction substantially parallel to the line BB shown in FIG. 2 (a)). When pressed with a pressing force equal to or more than a predetermined value from the substantially front-rear direction, they are plastically deformed so as to be crushed so as to narrow the gap therebetween (FIG. 2 (c)).

In the shock absorbing portion 16, the lower ends (ends on the lower side of the seat cushion frame 10) of the folds 16a are formed so as to converge with each other. The amount of deformation at the upper end (the end on the upper side of the seat cushion frame 10) is large. As a result, the shock absorbing portion 16 is formed in a substantially fan shape opened to the upper end side, and the seat cushion 10a of the seat cushion frame 10 is placed on the shock absorbing portion 16 with a moment greater than a predetermined value (second).
When pressure is applied (to fall in the direction of arrow Y shown in FIG. 7A), the upper end is more deformed than the lower end to induce rotation of the seat belt 10a.

Note that stoppers 18 are provided on both sides of the shock absorbing portion 16 of the seat cushion frame 10 to limit the amount of deformation of the shock absorbing portion 16. In this embodiment, as shown in FIG. 2, the stopper 18 is composed of a projection provided on the side surface of the seat cushion frame 10 so as to face the impact absorbing portion 16 therebetween. When the stopper 18 is deformed by a predetermined amount, the stopper 18 stops the deformation of the shock absorbing part 16 by contacting the crushed fold 16a of the shock absorbing part 16 or the other stopper 18 facing the same. Has become.

An occupant is seated on the seat 1 of the automobile having the above-described configuration, and the above-mentioned seat belt (not shown) is attached to the occupant. The shoulder belt is pulled out along the front surface of the occupant's upper body. If the vehicle body suddenly decelerates due to a collision from the front of the vehicle body while the vehicle is running, the occupant moves forward with a very large impact force due to inertia force, and the shoulder belt Run on. At this time, as described above, the shoulder belt cannot be extended from a seat belt retractor (not shown) to which one end thereof is connected, so that the shoulder belt can be received without increasing its length, and the shoulder belt can be received from the seat belt retractor. A large tension is applied by the impact force, and the seat back 3 supporting the upper portion is strongly pulled forward. As a result of being strongly pulled forward by the shoulder belt as described above, a large moment is generated in the seatback 3 in the direction of leaning forward about the lower end portion of the seatback 3. Also, due to the tension of the shoulder belt, a moment is generated in the seat cushion 2 so as to peel off the seat cushion 2 from the floor of the vehicle body around the front end side as the center of rotation.

In the seat 1, as described above, when the moment acting on the seat back 3 exceeds a predetermined value, the shock absorbing portion 16 provided on the rear end side of the seat cushion frame 10 is plastically deformed. Then, the seat back 3 is allowed to rotate forward about the lower end thereof. As a result, the seat back 3 gradually leans forward due to the tension of the shoulder belt while receiving the drag caused by the deformation of the impact absorbing portion 16, so that the seat back 3 can absorb the impact of the shoulder belt tension and eventually the occupant. become.

The seat cushion frame 10 has a stopper 1 for restricting the amount of deformation of the shock absorbing portion 16.
8 is provided to prevent the seatback 3 from leaning forward excessively, so that the occupant's upper body protrudes largely forward and hits an instrument panel (not shown) at the front of the vehicle body. There is nothing.

When the vehicle is hit by a collision, the shock absorbing portion 16 is plastically deformed in the extending direction so that the seat back 3 is tilted rearward, and the rearward shock is absorbed.

In this embodiment, the shock absorbing portion is provided near the rear portion of the seat cushion frame 10, but the arrangement of the shock absorbing portion is not limited to this. It may be provided on a pivot portion or the like of the rotation connecting member 14. Also,
The configuration of the shock absorbing portion is not limited to the above, and when a moment greater than a predetermined value is applied to the seat back 3 in the forward or rearward direction, the shock absorbing portion is plastically deformed to rotate the seat back 3 forward or backward. May be acceptable as long as it allows Of course, the stopper configuration for restricting the amount of deformation of the shock absorbing portion may be other than the above.

[0035]

According to the present invention, in a mobile seat having a seat belt device in which an upper portion of a shoulder belt is supported by a seat back, a portion near a rear portion of a seat cushion frame, a portion near a lower portion of the seat back frame, or the seat cushion. When a forward moment greater than or equal to a predetermined value is generated in the seat back with respect to the rotation connecting member that rotatably connects the frame and the seat back frame, the seat back is plastically deformed to rotate the seat back forward. By providing a permissible shock absorbing part and absorbing shock force from the occupant added to the shoulder belt by this shock absorbing part, the frame etc. forming the skeleton of this seat can be made high strength, There is no need to separately install a mechanism to absorb this impact force on the seat belt retractor, etc. Thus it is possible to shoulder belt is inexpensively manufactured relatively lightweight seat of the moving body equipped with a seat belt device which is supported by the seat back.

Further, according to the present invention, there is provided a seat of a movable body capable of absorbing a rearward impact such as a collision.

[Brief description of the drawings]

FIG. 1 is a perspective view of an automobile seat as a moving object seat according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a configuration of a shock absorbing portion of the seat of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat 2 Seat cushion 3 Seat back 10 Seat cushion frame 12 Seat back frame 14 Rotating connecting member 16 Shock absorbing part 18 Stopper

Claims (3)

[Claims] An upper portion of a shoulder belt of a seat belt device is a seat of a moving body supported by a seat back, a seat cushion frame existing along a side portion of a seat cushion, and a side portion of the seat back. And a seat back frame having a lower portion rotatably connected to a rear portion of the seat cushion frame by a rotatable connection member, in the vicinity of a rear portion of the seat cushion frame. When a predetermined forward moment or more with respect to the seat back is generated in at least one of the vicinity of the lower portion of the seat back frame and the rotation connecting member, the seat back is allowed to rotate forward by plastically deforming. A seat for a moving body, characterized by having a shock absorbing portion that performs a shock absorbing operation. 2. A seat for a movable body in which an upper portion of a shoulder belt of a seat belt device is supported by a seat back, wherein a seat cushion frame exists along a side portion of the seat cushion, and a side portion of the seat back. And a seat back frame having a lower portion rotatably connected to a rear portion of the seat cushion frame by a rotatable connection member, in the vicinity of a rear portion of the seat cushion frame. When a rearward moment greater than a predetermined value with respect to the seat back is generated in at least one of the vicinity of the lower portion of the seat back frame and the rotation connecting member, the rearward rotation of the seat back is permitted by plastic deformation. A seat for a moving body, characterized by having a shock absorbing portion that performs a shock absorbing operation. 3. The seat according to claim 1, further comprising a stopper for restricting an amount of deformation of the shock absorbing portion.