JP2001163099A - Vehicular seat structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide protection reinforcement of a head part and a neck part of a seated person during a rear collision or the like without complicating constitution. SOLUTION: A headrest holder 16 is supported so as to be able to rise forwardly tilted from a predetermined rear initial position via a guide means 22 and it is deflected and held in this rear initial position under a deflecting force of a regulating spring 40. A passive means 32 converting and transmitting a rear moving load of an upper body of the seated person as a forwardly tilted rising force is arranged inside a seat back 14. The deflecting force of the regulating spring 40 is set on the basis of an inertial load in regard to an impact load in the rear collision, and when this inertial load in the rear collision is received by a textile belt (passive part) 30 of the passive means 32, the headrest holder 16 rises forwardly tilted in resistance to the deflecting force of the regulating spring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vehicle seat,
In particular, the present invention relates to a vehicle seat structure provided with a headrest capable of protecting a seated person's head from an impact load at the time of a rear collision.

[0002]

2. Description of the Related Art For example, when a so-called rear collision, such as a collision when the vehicle retreats or a rear-end collision with the rear of the vehicle, occurs, the head of the occupant suddenly leans backward due to the inertial movement at that time. try to. And, since the sudden backward tilt of the head, the so-called whiplash movement, has a risk of damaging the neck, etc., suppressing this whiplash movement can prevent the seated person, especially the head, And one of the protective measures to protect the neck more safely.

In order to suppress the whiplash movement, for example, the headrest can be expanded forward by receiving inertial movement of the occupant's upper body caused by an impact load at the time of a rear collision. The configuration of JP 49-019909 is known. In this known configuration, the body containing the fluid is in the seat back, and another body connected to this body via a pipe is in the front of the headrest at the top of the seat back, respectively. It is arranged. Then, the seat back side body receives the inertial movement of the occupant upper body caused by the impact load at the time of a rear collision,
By letting the fluid inside flow out to the body on the headrest side, the body on the headrest side can be expanded forward.

According to this configuration, the gap between the headrest and the head, that is, the rearward inclined space of the head is filled by the expansion of the body on the headrest side.
In the event of a rear collision or the like, the head is tilted backward, that is, whiplash movement is suppressed. Therefore, it is possible to prevent damage to the neck of the seated person, etc., so that further improvement of the protection performance at the time of a rear collision can be expected.

[0005]

However, in the known configuration disclosed in Japanese Utility Model Laid-Open No. 49-019909,
It is necessary to arrange the body on both the seat back and the headrest, and to connect the two bodies with a plurality of pipes, so that the configuration of the entire seat is likely to be complicated.

Further, in this known structure, since a heavy fluid is accommodated in a carcass, it is inevitable to increase the weight of the sheet by the fluid.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle seat structure capable of strengthening protection of a head and a neck of a seated person at the time of a rear collision without complicating the configuration.

[0008]

To achieve this object, according to the present invention, the connection of the stay of the headrest,
The fixed headrest holder can be tilted forward from the specified rear initial position with respect to the seat back frame,
A passive portion which is connected and supported via a predetermined guide means, is biased and held at its rear initial position under the biasing force of the regulating spring, and receives a rearward moving load of the seated body; Passive means for converting the load to the headrest holder as a forward leaning force and transmitting the converted force is provided in the seat back.

The biasing force of the regulating spring is set on the basis of the inertial load with respect to the impact load at the time of a rear collision, and the inertial load from the occupant's upper body with respect to the impact load at the time of a rear collision is received by the passive portion of the passive means. At this time, the headrest holder can be tilted forward and upward against the biasing force of the regulating spring.

[0010]

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

As shown in FIG. 1, in a vehicle seat structure 10 according to the present invention, a headrest 12 is provided on a headrest holder 16 provided in a seatback 14 via a stay 18 extending downward. Connected and fixed.

The headrest 12 is formed, for example, such that elastic bodies (pads) are arranged around a predetermined frame and these are covered with a trim cover so that the head of the seated person can be elastically supported. Is the same as the conventional one, and since the structure is not the gist of the present invention, detailed description of the headrest itself is omitted here.

In the present invention, a headrest holder 16 which is an integral member with the headrest 12 is provided.
The guide means 22 can be tilted forward from the rear initial position with respect to the seat back frame 20, that is, can be moved between the rear initial position shown in FIG. 1 and the front tilt raised position shown in FIG. It is connected and supported through.

As can be seen from FIG. 3 in addition to FIG.
For example, guide brackets 24 are fixed to the left and right upper portions of the seat back frame 20, respectively. The guide means 22 is formed as a combination of an elongated guide hole 26 formed in the guide bracket 24 of the seat back frame and a guide pin 28 protruding from the outer surface of the headrest holder 16. By arranging the combination at the upper and lower separated positions, the orbit of the headrest holder to tilt forward is secured.

Further, according to the present invention, the passive means 32 having the passive portion 30 for receiving the rearward moving load of the occupant's upper body can convert and transmit the received rearward moving load to the headrest holder 16 as a forward tilting force. In addition, it is formed in the seat back 14.

As the passive portion 30 of the passive means, the headrest holder 16, for example, an erecting rod 34 installed and fixed between the left and right headrest holders, and a lower fixing member of the seat back 14, for example, a lower end portion of the seat back frame 20. For example, a flexible band member connecting each terminal, for example, a cloth belt with low elasticity, etc., is used. This cloth belt is capable of passively moving the rearward movement load of the occupant's upper body, for example, a seating surface of the seat back 14. It is located along 14a. The cloth belt (passive part) 30 is supported by a connecting part of the terminal to the headrest holder 16, that is, by a rotatable support member 36 disposed above the erection rod 34 so as to be able to advance and retreat. The headrest holder 16 uses the rearward moving load received by the cloth belt
It can be converted and transmitted.

As the rotation support member 36, for example,
A roller rotatably supported by the upper end bracket 38 of the seat back frame 20 can be exemplified.

In the present invention, the regulating spring 40
The headrest holder 16 is biased and held at the rear initial position by the biasing force. As the regulating spring 40,
For example, between the erection rod 34 of the headrest holder and the left and right sides of the seat back frame 20 below the erection rod 34,
A tension coil spring installed and stretched between the fixed rod 42 and the fixed rod 42 can be used, and the biasing force of this regulating spring is set based on the inertial load with respect to the impact load at the time of a rear collision.

For example, when a rear collision of an automobile occurs in the initial state shown in FIG. 1, an inertial load F resulting from an impact at the time of the rear collision is input to the seating surface 14a of the seat back. When the inertial load F exceeds the biasing force of the regulating spring 40, the headrest holder 16, that is, the headrest holder 16,
12 is pulled up to the forward tilting up position shown in FIG.

As described above, the vehicle seat structure of the present invention is provided.
In 10, the headrest 12 can be moved from the rear initial position to the forward inclined position by utilizing the inertial movement of the occupant's upper body that occurs at the time of a rear collision of an automobile or the like. According to this, the gap between the headrest and the head of the seated occupant is filled under the upward tilt of the headrest 12, so that the whiplash movement caused by the sharp backward tilt of the head is reliably suppressed. You. Therefore, by sufficiently improving the protection effect of the head and neck at the time of a rear collision or the like, the damage to the occupant is reliably reduced.

According to the present invention, the headrest holder 16 can be moved forward and upward, and the headrest holder is biased to the rear initial position by the regulating spring 40.
It is sufficient that the inertial movement force of the occupant's body can be converted and transmitted by the passive means 32 into the forward tilting upward force of the headrest holder while being held. That is, since the present invention can be embodied only with a simple mechanical configuration without using a heavy fluid like a known configuration, according to the present invention, the head and neck of a seated person Can be easily improved without complicating the configuration and increasing the weight.

Further, according to the present invention, the headrest 12
Since the remodeling or the like is not required, the configuration can be simplified from this point.

In the present invention, since the head of the occupant at the time of a rear collision can be supported when the headrest 12 is tilted forward, the head at the time of a rear collision tends to move upward. The movement of the headrest appropriately corresponds to the inertial movement of the headrest. That is, like this, the headrest
If 12 is tilted forward, the occupant's head at the time of a rear collision,
And the protective effect of the neck is further improved.

Further, the headrest 12 is moved to a normal support position,
In other words, according to this configuration in which the occupant is moved to a position higher than the rear initial position, a deterrent effect on the rearward movement of the occupant's upper body at the time of a rear collision or the like can be obtained. Improvement can also be greatly expected.

Here, in the embodiment of the present invention, the structure in which the cloth belt 30 is used as a passive portion as the passive means 32 is embodied. It is sufficient that the headrest holder 16 is tilted forward and upward, and the present invention is not limited to this. For example, a passive unit may be configured by using another member as a passive unit.

However, according to this embodiment in which the flexible band member such as the cloth belt 30 is used as the passive portion, the backward movement of the occupant's body can be appropriately passively performed without complicating the configuration. Since the detection can be performed, the cost can be reliably reduced due to the simplification of the configuration.

In the embodiment of the present invention,
The combination of the elongated hole-shaped guide hole 26 and the guide pin 28 is embodied as the guide means 22, but the guide means is not limited to this as long as it can secure the forward tilting trajectory of the headrest holder 16, For example, a combination of a guide rail and a roller, a link body that can be bent and rotated, or the like may be used as the guide unit.

However, if the guide means 22 is formed from the combination of the elongated guide hole 26 and the guide pin 28, a properly operable guide means can be secured without adding a dedicated member. From this point, the structure can be simplified sufficiently.

The embodiments described above are intended to explain the present invention, and do not limit the present invention in any way, and all modifications and alterations within the technical scope of the present invention are also included in this embodiment. It goes without saying that it is included in the invention.

[0030]

As described above, according to the vehicle seat structure of the present invention, the headrest is moved from the rear initial position to the forward tilted up position by the inertial movement of the occupant's upper body generated at the time of a rear collision of an automobile or the like. Then, the gap between the headrest and the head of the seated occupant is filled under the upward inclination of the headrest, so that the whiplash movement caused by the sudden backward inclination of the head is reliably suppressed. Therefore, by sufficiently improving the protection effect of the head and neck at the time of a rear collision or the like, the damage to the occupant is reliably reduced.

Then, the headrest holder can be moved in the upwardly inclined direction, and the headrest holder is biased and held at the rear initial position by a regulating spring.
It is sufficient if the inertial movement force of the occupant's upper body can be converted and transmitted by passive means to the forward tilting force of the headrest holder, so that it can be easily secured without complicating the configuration and increasing the weight. Become.

Further, since the headrest is tilted forward, the effect of protecting the occupant's head and neck at the time of a rear collision or the like is further improved. By moving the headrest to a position higher than the normal support position, a deterrent effect on the rearward movement of the occupant's upper body at the time of a rear collision or the like can be obtained. Improvement can also be greatly expected.

Further, if the passive means is formed by using the flexible band member as a passive portion, the rearward movement of the occupant's upper body can be appropriately passively and detected without complicating the configuration, thereby simplifying the configuration. It is possible to surely reduce the cost due to the above.

If the combination of the elongated guide hole and the guide pin is used as the guide means, the guide means that can be operated properly can be secured without adding a dedicated member. Simplification is fully achieved.

[Brief description of the drawings]

FIG. 1 shows a vehicle seat structure according to the present invention in an initial position behind a headrest holder (headrest).
It is an outline longitudinal section of a seat back.

FIG. 2 is a schematic longitudinal sectional view of a seat back in a vehicle seat structure in a position where a headrest holder (headrest) is tilted forward and upward;

FIG. 3 is a schematic front view showing a vehicle seat structure, partially broken away of a seat back.

[Explanation of symbols]

 10 Vehicle seat structure 12 Headrest 14 Seat back 22 Guide means 26 Guide hole 28 Guide pin 30 Passive part (flexible cloth member; cloth belt) 32 Passive means 36 Rotation support member 40 Regulation spring

Claims (3)

[Claims] 1. A vehicle seat having a headrest capable of elastically supporting a head of a seated person at an upper end of a seat back via a stay, wherein a headrest holder to which a stay of the headrest is connected and fixed is provided. The back frame is connected and supported via predetermined guide means so as to be tiltable forward from a predetermined rear initial position, and is biased and held at the rear initial position under the biasing force of the regulating spring. Passive means for receiving a rearward moving load of the occupant's upper body, and converting and transmitting the load to the headrest holder as a forward tilting upward force, is provided in the seat back, and a biasing force of the regulating spring is provided. When the inertial load from the occupant's upper body to the impact load at the time of a rear collision is received by the passive part of the passive means, A seat structure for a vehicle, wherein the drest holder can be tilted forward and upward against a biasing force of a regulating spring. 2. The passive means is connected with connection of each terminal to a headrest holder and a lower fixing member of a seat back, and is supported by a rotatable support member at a position above the headrest holder-side connection portion so as to be movable forward and backward. The flexible band member provided is a passive portion, and when the flexible band member is pressed from the seat back seating surface and the headrest holder side terminal is raised, the headless holder is moved by the biasing force of the regulating spring. Claim 1 formed so as to be able to lean forward in opposition to
The vehicle seat structure according to any one of the preceding claims. 3. The guide means is formed as a combination of a long hole-shaped guide hole formed in a guide bracket of the seat back frame; and a guide pin protruding from a headrest holder. The vehicle seat structure according to claim 1 or 2, wherein the headrest holder has a forward-inclined trajectory as a result of being disposed on the vehicle.