JP2002002345A - Vehicle seat structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the use of a power generating device and prevent loosening of a seatbelt so as to cause upward movement of a movement stopping member positioned under the front section of the seat part of a seat in a vehicle seat structure in which the movement stopping member is moved upward to prevent a seated occupant from moving forward relative to the seat and sinking. SOLUTION: A second support member 5 for supporting the seat part 1a of the seat 1 is moved forward by a forward inertial force, and the movement stopping member 8 is provided which is located under the seat part 1a of the seat 1 and moved upwards to prevent a seated occupant from moving forward relative to the seat part 1a of the seat 1. A linkage means 6 is provided for mechanically transmitting to the member 8 the forward displacement of the second support member 5 caused by a forward inertial force so as to move the member 8 upward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat structure for a vehicle such as a passenger car or a commercial vehicle.

[0002]

2. Description of the Related Art When a vehicle collides with an occupant seated in a seat, the seated occupant (the occupant's waist) moves forward and sinks into the seat due to the inertia force at the time of forward movement. (Submarine phenomenon) may occur. As a configuration for preventing the above-described state, for example, as disclosed in JP-A-2000-1136,
The movement prevention member (6 in FIGS. 1 and 2 of the above publication) arranged below the seat portion of the seat is moved upward, and the front portion of the seat portion of the seat is lifted upward to be seated. Some are configured to prevent the occupant from moving forward with respect to the seat and trying to sink. in this case,
For example, a power generation device (7 in FIGS. 1 and 2 in the above-mentioned publication) is used, such as an inflator of an airbag device, which operates a movement inhibiting member by generating gas explosively.

[0003] On the other hand, for example, Japanese Utility Model Application Laid-Open No. 4-13423.
As disclosed in the publication, the seated occupant attempts to move forward with respect to the seat, and the buckle (15 in FIGS. 1 and 2 of the publication) is pulled by the occupant via the seat belt. When operated, the operation of the buckle is transmitted to the movement preventing member (4 in FIGS. 1 and 2 of the above publication) via a rod (12 in FIGS. 1 and 2 of the above publication). In some cases, the movement preventing member is configured to move upward. With this, the state in which the seated occupant moves forward with respect to the seat and tries to sink is pressed by the thigh of the seated occupant so that the front part of the seat is sunk, and is prevented by the movement preventing member. This prevents the seated occupant from moving forward and sinking in the seat. By using the phenomenon in which the buckle portion is pulled, the movement preventing member is configured to move upward, thereby providing the above-described JP-A-2000-113.
This eliminates the need for a power generation device as disclosed in Japanese Patent Application Laid-Open No. 6-206, which is advantageous in reducing production costs.

[0004]

In the structure disclosed in Japanese Unexamined Utility Model Publication No. Hei. 4-13423, the seated occupant moves forward with respect to the seat and tries to sink.
When the buckle is pulled, the seat belt is loosened with respect to the seat with the operation of the buckle, which is not preferable.

When the operation of the buckle is mechanically transmitted to the movement inhibiting member when the buckle is pulled, the position of the buckle and the movement inhibiting member are reduced in terms of the structure and arrangement of the mechanism. Must be constant. In this case, the conventional technique disclosed in the prior art 4-13
In the structure disclosed in Japanese Patent No. 423, the movement preventing member is provided on the seat. Therefore, even if the position of the seat is changed in the front-back direction, the distance between the position of the buckle portion and the position of the movement preventing member is constant. The buckle must also be provided on the seat in order to be maintained at Thereby, in the structure of Japanese Utility Model Laid-Open No. 4-13423 described in the related art,
The buckle is not compatible with the vehicle type provided on the fixed part of the vehicle body, and there is room for improvement.

The present invention is directed to a state in which a movement preventing member disposed below a front portion of a seat portion of a seat is moved upward, so that a seated occupant moves forward with respect to the seat and tries to sink. In the vehicle seat structure configured to prevent, when configured to move the movement preventing member upward without using the power generation device, it is an object to configure so that the seat belt is not loosened, It is an object of the present invention to provide a configuration in which the buckle portion can correspond to a vehicle type provided in a fixed portion of the vehicle body.

[0007]

[I] According to the features of claim 1 (claim 2), a second support member for supporting a seat portion of a seat (a second support member for supporting a seat back portion).
Is configured to be displaced forward (upward) by a forward inertial force, and is positioned below the seat portion of the seat and moves upward, so that the seated occupant can move with respect to the seat portion of the seat. A movement preventing member for preventing a state of moving forward is provided. Thus, according to the feature of claim 1 (claim 2), when the seated occupant moves forward with respect to the seat and tries to sink, the second support member is moved forward (upward) by inertia force forward. Then, the forward (upward) displacement of the second support member is mechanically transmitted to the movement preventing member by the linking means, and the movement preventing member moves upward.

As described above, according to the features of claim 1 (claim 2), the seated occupant moves forward with respect to the seat as in the structure of Japanese Utility Model Laid-Open No. 4-134423 described in the prior art. When the buckle part is pulled, the movement inhibiting member is not moved upward when the buckle is pulled down. Instead, the second supporting member (the seat backrest) for supporting the seat portion of the seat is provided. (The second support member supporting the section) is displaced forward (upward) to move the movement preventing member upward. Does not occur.

According to the features of claim 1 (claim 2), as described above, the second support member for supporting the seat portion of the seat (the second support member for supporting the backrest of the seat) moves forward (upward). By displacing, the movement preventing member is configured to move upward, so that the movement preventing member operates normally regardless of whether the buckle portion is provided on the seat or the fixed portion of the vehicle body. To move upwards. Thus, according to the features of claim 1 (claim 2), the buckle portion can cope with both the vehicle type provided on the seat and the vehicle type provided on the fixed portion of the vehicle body without any trouble.

[II] According to the second aspect of the present invention, the first support member supported on the vehicle body side such that the second support member supporting the backrest of the seat is displaced upward by the inertia force forward. Are swingably supported around the horizontal axis.
Thereby, according to the feature of claim 2, when the second support member is displaced upward due to the inertia force forward, the backrest portion of the seat supported by the second support member is displaced forward, Since the seat portion of the seat does not move forward due to the upward displacement of the second support member, when the seated occupant moves forward and sinks, the seat portion of the seat is A condition that encourages the occupant to move forward and sink is unlikely to occur.

Further, according to the second aspect of the present invention, if the seat portion of the seat is not supported by the second support member but is supported by a member different from the second support member, the inertia toward the front is improved. When the second support member is displaced upward by the force, the seat portion of the seat is not displaced forward by the upward displacement of the second support member. The seat does not move upward due to the displacement. As a result, when the seated occupant moves forward and sinks with respect to the seat, a state in which the seat portion of the seat encourages the occupant to move forward and sink is more unlikely to occur.

[III] As in the feature of the second aspect, the backrest portion of the seat is supported by the second support member, and the seat backrest is swingably movable about the horizontal axis of the first support member supported on the vehicle body side. 2
When the supporting member is supported, the back portion of the seat, which is relatively heavy, is moved to the second supporting member (horizontal axis of the first supporting member).
Will be located above. Thus, according to the second aspect of the present invention, a relatively large moment based on the backrest of the seat is generated by the inertia force to the front, and the second support member is reliably displaced upward. In addition, the upward displacement of the second support member is mechanically transmitted to the movement preventing member by the linking means, so that the movement preventing member reliably moves upward.

[IV] According to the feature of the third aspect, similar to the case of the first or second aspect, the "action" described in the above-mentioned [I] to [III] is provided. It has various “actions”. According to the feature of the third aspect, since the first support member supported on the vehicle body side is provided with the movement preventing member, the movement preventing member is provided with respect to the forward (upward) displacement of the second support member. There is no displacement.
Thus, according to the third aspect of the present invention, even if the second support member is displaced forward (upward) due to the inertia force forward, the movement preventing member moves upward without being displaced. The state in which the occupant moves forward and sinks with respect to the seat is stably prevented by the movement preventing member.

In particular, the second support member for supporting the seat portion of the seat is provided on the first body supported on the vehicle body side.
When supported by the support member to be displaced forward,
When the first support member is provided with the movement preventing member as in the feature of claim 3, the movement preventing member is attached to the second support member (the seat portion of the seat) as the second support member is displaced forward. It is in a state of being relatively displaced rearward. This allows
According to the characteristic of claim 3, the second inertia force is applied to the second
When the support member (seat portion of the seat) is displaced forward, the movement preventing member that has moved upward is moved to the second support member (seat portion of the seat).
Is relatively displaced rearward with respect to the seat, so that the movement preventing member pushes the thigh of the occupant moving forward and sinking relative to the seat relatively rearward.

[V] According to the features of claim 4, claim 1
As in any one of [3] to [3],
It has the “action” described in [IV], and additionally has the following “action”. According to the feature of claim 4, when the forward inertial force is less than the set value, the forward (upward) displacement of the second support member is prevented, and when the forward inertial force becomes larger than the set value, Holding means for holding the second support member is provided so as to allow the second support member to move forward (upward). Thus, according to the feature of the fourth aspect, even if the occupant gets on and off the vehicle in a normal use state or adjusts the position of the seat in the front-rear direction, the second state is maintained.
A state where the support member moves forward (upward) does not occur.

[VI] According to the feature of claim 5, as in any one of claims 1 to 4, the above [I]
To [V], in addition to the following “action”. According to the feature of the fifth aspect, the first support member is supported by the guide member fixed to the vehicle body so that the position can be changed and the position can be fixed along the front-rear direction. Thus, according to the features of claim 5, by changing the position and fixing the position of the first support member along the front-rear direction, the position of the seat in the front-rear direction can be adjusted without any trouble. When the seated occupant moves forward and sinks with respect to the seat and a forward inertial force is applied to the second support member, the second support member is displaced forward (upward),
The movement preventing member normally moves upward.

[0017]

FIG. 1 shows the vicinity of a seat 1a and a backrest 1b of a seat 1 (a driver seat and a passenger seat) of a passenger car. The lower rail 2 is fixed to a fixed portion of the vehicle body, and a pair of left and right upper rails 3 is supported movably in the front-rear direction along the lower rail 2. A pair of left and right first support members 4 in the form of a vertical wall is fixed to the upper rail 3, and a lock mechanism (not shown) is provided which can fix the upper rail 3 to a desired position with respect to the lower rail 2. .

As shown in FIG. 1, a pair of left and right second support members 5 in the form of an angle material are fixed to the lower portion of the seat 1a of the seat 1, and a pin 5a fixed to the second support member 5 is provided. 1
The support member 4 is inserted into the long hole 4a. A pair of left and right operation arms 6 each having a “H” shape in side view are attached to the first support member 4 by stepped rivets 7, and a rod 8 is bridged over the front end of the operation arm 6.

As shown in FIG. 1, a stepped rivet 9 is attached to the rear end of the operation arm 6, and the stepped rivet 9 is inserted into the elongated hole 4 b of the first support member 4 and the elongated hole 5 b of the second support member 5. A rivet 9 is inserted. A buckle 11 (seat belt anchor) is attached to a support shaft 10 fixed to one of the left and right second support members 5, and a locking metal fitting 13 through which the seat belt 12 is passed is inserted into the buckle 11. Fix it.

The state shown in FIG. 1 is a normal use state,
The rod 8 is located below the front portion of the seat 1a of the seat 1, and the stepped rivets 7, 9 are caulked and fixed in the state shown in FIG. 1, and the upper rail 3 and the first support member 4 are fixed. In contrast, the seat 1a of the seat 1 and the operation arm 6 are fixed in the state shown in FIG.

In the normal use state shown in FIG. 1, the angle of the backrest 1b of the seat 1 with respect to the seat 1a of the seat 1 is changed. By moving the seat 1 (upper rail 3) with respect to the lower rail 2, the position of the seat 1 (upper rail 3) is changed in the front-rear direction, and the seat 1 (upper rail 3) is moved by the aforementioned locking mechanism (not shown). The rail 3) is fixed at a desired position. Sheet 1 as described above
Even if the angle of the backrest 1b is changed and the position of the seat 1 (upper rail 3) is changed in the front-rear direction, the stepped rivets 7, 9 are fixed by caulking. The seat 1a of the seat 1 and the operation arm 6 do not move relative to the support member 4 from the state shown in FIG.

Next, due to the collision of the vehicle, the seated occupant moves forward (to the left in FIG. 1) with respect to the seat 1 and tries to sink, and a large forward inertia force equal to or greater than a set value (see FIG. 1). When the sheet (left side in the drawing) is hooked on the seat 1, the seat 1a and the backrest 1b, the buckle 11, and the second support member 5 of the seat 1 overcome the fixing action of the stepped rivets 7, 9.
Moves forward (to the left in FIG. 1) with respect to the upper rail 3 and the first support member 4 (the pin 5a of the second support member 5 and the stepped rivet 9 are elongated in the first support member 4). 4
a, and move forward (to the left in FIG. 1).

As described above, when the second support member 5 moves forward with respect to the upper rail 3 and the first support member 4,
As shown in FIG. 2, the operation of the operation arm 6 is pivoted clockwise in FIG. 2 around the stepped rivet 7 by the action of the elongated hole 5b of the second support member 5 and the stepped rivet 9, so that the rod 8 As a result, the front portion of the seat portion 1a of the seat 1 is lifted upward, and the pins 5a and the stepped rivets 9 of the second support member 5 are elongated by the long holes 4a, 4 of the first support member 4.
2B, the seat 1a, the backrest 1b, the buckle 11, and the second support member 5 of the seat 1 stop relative to the upper rail 3 and the first support member 4. By lifting the front portion of the seat portion 1a of the seat 1 upward in this manner, a state in which the seated occupant moves forward with respect to the seat 1 and tries to sink is prevented.

In this case, as shown in FIGS. 1 and 2, since the operation arm 6 is attached to the first support member 4 which is a portion fixed to the seat 1a of the seat 1, the seat 1 When the seat 1a of the seat 1 moves forward (to the left in FIG. 1) with respect to the upper rail 3 and the first support member 4, the rod 8 moves rearward with respect to the seat 1a of the seat 1 (FIG. 2).
To the right of the drawing). When the operation arm 6 is pivoted clockwise in FIG. 2 with the stepped rivet 7 as a fulcrum, the rod 8 moves rearward (to the right in FIG. 2) while moving upward along a circular locus. State. As shown in FIGS. 1 and 2, the buckle portion 11 (seat belt 12) also moves forward together with the seat portion 1 a and the backrest portion 1 b of the seat 1, so that the seat portion 1 a and the backrest portion 1 b of the seat 1 Buckle part 11 (seat belt 1
There is no change in the positional relationship with 2).

With the above structure, as shown in FIG. 2, the seated occupant moves forward with respect to the seat 1 and tries to sink, and the seat 1a and the backrest 1b of the seat 1, the buckle 11, and the second When the support member 5 moves forward with respect to the upper rail 3 and the first support member 4, the seat 1 a of the seat 1 is held in a state where the waist of the seated occupant is substantially fixed to the seat 1 a of the seat 1. Of the front portion of the seat 1 moves rearward (a state in which the rod 8 moves relatively rearward while moving upward with respect to the seat portion 1a of the seat 1), and the occupant sitting on the seat 1 The state of moving forward and trying to sink is accurately prevented.

[First Embodiment of the Invention] FIGS. 1 and 2
In the structure shown in FIG. 5, the fixing of the stepped rivets 7 and 9 by caulking is abolished, and as shown in FIG. 3, the pins 4c and 4d are fixed to the left and right first support members 4, and the left and right first support members 4 are fixed. Are extended from the free length over the pin 4c of the left and right sides of the second support member 5 and the pin 4d of the left and right first support member 4 and the stepped rivet 9 of the left and right operation arms 6. The spring 14 to which the initial tensile force has been applied may be connected.

As a result, when a large forward inertial force (left side in FIG. 3) greater than the initial tension force of the spring 14 is applied to the seat 1, the initial tension force of the spring 14 is overcome, and the seat portion of the seat 1 is overcome. 1a and the backrest 1b, the buckle 11, and the second support member 5
The support member 4 is moved forward (to the left in FIG. 3).

[Second Alternative Embodiment of the Invention] Instead of the above-described [Embodiment of the Invention] and [First Alternative Embodiment of the Invention], a configuration as shown in FIGS. 4 and 6 may be employed. Good. As shown in FIGS. 4 and 6, a pair of left and right lower rails 2 is provided in a seat 1 (driver's seat and passenger seat) of a passenger car, as in FIG.
Are fixed to a fixed portion of the vehicle body, and a pair of left and right upper rails 3 is supported movably in the front-rear direction along the lower rail 2. A pair of left and right first support members 15 having a vertical wall shape is fixed to the upper rail 3.
And a lock mechanism (not shown) capable of fixing the upper rail 3 at a desired position with respect to the seat 1a.
Are attached to the first support member 15.

As shown in FIGS. 4 and 6, a pair of left and right operation arms 16 are attached to the intermediate portion of the first support member 15 by stepped rivets 17, and the operation arms 16 are provided.
A rod 18 is provided over the front end of the rod. A pair of left and right balance arms 19 is attached to the first support member 15 by step rivets 20, and a step rivet 21 of the operation arm 16 is inserted into a long hole 19 a of the balance arm 19.

As shown in FIGS. 4 and 6, the front part of a pair of left and right flat second support members 22 is attached to the front part of the first support member 15 by stepped rivets 23.
The backrest 1b of the seat 1 is provided at the rear of the second support member 22.
Is attached via a recliner section 24. The second support member 22 is inserted into the long hole 19 b of the balance arm 19.
Is inserted. A buckle portion 11 (seat belt anchor) is attached to a support shaft (not shown) fixed to one of the first support members 15 on the left and right sides, and the locking fitting 13 through which the seat belt 12 is passed is attached to the buckle portion 11. And fix it.

The state shown in FIG. 4 is a normal use state.
The rod 18 is located below the front portion of the seat 1a of the seat 1, and the stepped rivets 17, 20, 21, 23, 25 are caulked and fixed in the state shown in FIG. The backrest 1b of the seat 1 and the operation arm 16 are fixed to the first support member 15 in a state shown in FIG.

In the normal use state shown in FIG. 4, the angle of the backrest 1b of the seat 1 with respect to the seat 1a of the seat 1 is changed by the recliner 24. Lower rail 2
The position of the seat 1 (upper rail 3) is changed in the front-rear direction by moving the seat 1 (upper rail 3) with respect to the seat 1 (upper rail 3). ) Is fixed at a desired position. Even if the angle of the backrest 1b of the seat 1 is changed and the position of the seat 1 (upper rail 3) is changed in the front-rear direction as described above, the stepped rivets 17, 20, 21, and
Since the members 23 and 25 are caulked and fixed, the backrest 1b and the operation arm 16 of the seat 1 do not move relative to the upper rail 3 and the first support member 15 from the state shown in FIG.

Next, due to the collision of the vehicle, the seated occupant moves forward (to the left in FIG. 4) with respect to the seat 1 and tries to sink, so that a large forward inertia force equal to or larger than the set value (FIG. 4).
Of paper on the left side of the paper)
7,20,21,23,25
The backrest 1b and the second support member 22 of the seat 1 swing forward (upward) around the stepped rivet 23.

As described above, the backrest 1b of the seat 1
When the second support member 22 swings forward (upward) with respect to the first support member 15, the balance arm 19 is rotated counterclockwise around the stepped rivet 20 by the second support member 22, as shown in FIG. The operation arm 16 is swung clockwise in FIG. 2 around the stepped rivet 17 by the balance arm 19, and the front portion of the seat 1 a of the seat 1 is lifted upward by the rod 18. The second support member 22 abuts against a stopper (not shown), and the backrest portion 1b and the second support member 22 of the seat 1 are further increased.
Swinging forward (upward) is stopped. By lifting the front portion of the seat portion 1a of the seat 1 upward in this manner, a state in which the seated occupant moves forward with respect to the seat 1 and tries to sink is prevented.

In this case, as shown in FIGS. 4 and 5, the first support member 15 to which the seat 1a of the seat 1 is attached is attached.
Since the stepped rivet 17 (operation arm 16) is attached to the seat 1, even if the backrest 1b and the second support member 22 of the seat 1 swing forward (upward) with respect to the first support member 15, The position of the stepped rivet 17 (operation arm 16) does not change. This allows the stepped rivet 17
The operation arm 16 is pivoted clockwise around the stepped rivet 17 in a state where the position of the rod 18 does not change, and the rod 18 moves slightly upward while drawing an arc trajectory (see FIG. 5). (To the right of the paper).
As shown in FIGS. 4 and 5, since the buckle portion 11 is attached to the first support member 15, the backrest 1 b of the seat 1 and the second support member 22 move forward (upward) with respect to the first support member 15. ) Does not change the positional relationship between the seat 1a of the seat 1 and the buckle 11 (seat belt 12).

As shown in FIGS. 4 and 5, a front portion of the second support member 22 is attached to a front portion of the first support member 15 by a stepped rivet 23, and the second support member 22 is provided with a first support member. When swinging upward with respect to the member 15, the movement stroke of the rear portion (the stepped rivet 25) of the second support member 22 is large. Stepped rivet 17 is first
The gap between the stepped rivet 17 and the rod 18 is larger than the distance between the stepped rivets 17 and 21 in the operation arm 16. Thus, when the backrest 1b and the second support member 22 of the seat 1 swing forward (upward) with respect to the first support member 15, the upward movement stroke of the rod 18 is large.

With the above structure, as shown in FIG. 5, the seated occupant moves forward with respect to the seat 1 and tries to sink, and the backrest 1b and the second support member 2 of the seat 1
2 swings forward (upward) with respect to the first support member 15, the waist of the seated occupant is substantially fixed to the seat 1a of the seat 1, and the front portion of the seat 1a of the seat 1 is The raised portion of the seat 1 moves rearward (a state in which the rod 18 moves slightly backward while moving upward with respect to the seat 1a of the seat 1), and the seated occupant moves forward with respect to the seat 1. The state of moving and sinking is properly prevented.

[Third alternative embodiment of the invention] In the above-mentioned [Embodiment of the invention] to [Second alternative embodiment of the invention], the stepped rivets 7, 9, 17, 20, 20, 21, 23 and 23 are formed.
25, the first supporting members 4, 15 and the second supporting members 15 shown in FIGS.
A configuration may be adopted in which a shear pin (not shown) is inserted between the support members 5 and 22.

As a result, when a large forward inertia force greater than the set value is applied to the seat 1, the shear pin is cut by shearing, and the seat 1 of the seat 1 in FIGS.
a, the backrest 1b, the buckle 11, and the second support member 5 move forward with respect to the upper rail 3 and the first support member 4. In FIG. 4, the backrest 1 of the seat 1 is shown.
b and the second support member 22 swing forward (upward) with respect to the first support member 15.

[Fourth Embodiment of the Invention] In the above-mentioned [Embodiment of the Invention] to [Third Embodiment of the Invention], the front portion of the seat 1a of the seat 1 is secured by the rods 8 and 18. The rods 8 and 1 are configured to be lifted upward.
8, the front part of the seat 1a of the seat 1 is not lifted up too much, so that the seated occupant moves forward with respect to the seat 1 and the seat 1a of the seat 1 The rods 8 and 18 prevent the state where the front part of the vehicle is depressed and sunk, thereby preventing the seated occupant from moving forward with respect to the seat 1 and trying to sink. You may comprise.

[Fifth Alternative Embodiment of the Invention] In the above-mentioned [Embodiment of the Invention] to "Fourth Embodiment of the Invention", the support shaft 10 and the buckle portion 11 shown in FIGS.
Is fixed to the first support member 4 and the vehicle body fixing portion (the lower rail 2 side).
May be provided. In the above-mentioned [Embodiment of the invention] and [First embodiment of the invention], FIG.
3 is supported by the upper rail 3 and the first support member 4, and when a large forward inertia force greater than a set value is applied to the seat 1, the seat 1a of the seat 1 And the second support member 5 is the upper rail 3
Alternatively, the backrest 1b of the seat 1 may be configured to move forward with respect to the first support member 4 and not move.

In the second embodiment of the invention described above, the seat 1a of the seat 1 is attached to the second support member 22 instead of the first support member 15, and a large forward inertia force equal to or greater than a set value is provided. Hangs on the seat 1, the seat 1a of the seat 1
The backrest 1b and the second support member 22 may swing forward (upward) with respect to the first support member 15. The present invention is applicable not only to the seat 1 (driver's seat and passenger seat) of a passenger car but also to a three-row seat type minivan or the like, when an independent seat is used instead of a bench seat for the second row seat. It can be applied to the stand-alone seat in the row.

[0043]

According to the features of claim 1 (claim 2),
It is configured to prevent a state in which a seated occupant moves forward with respect to the seat and tries to sink by moving the movement inhibiting member disposed below the front portion of the seat portion upward. In the seat structure of the vehicle, the second support member that supports the seat portion of the seat (the second support member that supports the backrest of the seat) is moved forward (upward) by the forward inertia force. , And the movement inhibiting member is configured to move upward, thereby preventing a state in which the seat belt is loosened with respect to the seat. Thus, in combination with the unfastened seat belt, the seated occupant can be properly prevented from moving forward and sinking with respect to the seat. In this case, claim 1 (claim 2)
According to the feature of the present invention, since a power generation device that operates the movement preventing member upward by generating gas explosively, such as an inflator of an airbag device, is not used,
It has the advantage of reducing production costs.

According to the features of claim 1 (claim 2), regardless of whether the buckle portion is provided on the seat or the fixed portion of the vehicle body, the movement preventing member normally moves upward. Therefore, the buckle portion can cope with both the vehicle type provided on the seat and the vehicle type provided on the fixed portion of the vehicle body without any trouble, so that the versatility is high.

According to the second aspect of the present invention, when the second support member is displaced upward by the inertia force forward, the seat portion of the seat is displaced forward by the upward displacement of the second support member. When the seated occupant moves forward with respect to the seat and tries to sink, it is unlikely that the seat portion of the seat will promote the occupant to move forward and sink, so the seated occupant This is advantageous in that it accurately prevents a state in which the sheet moves forward and sinks with respect to the sheet. Further, according to the feature of the second aspect, if the seat portion of the seat is not supported by the second support member but is supported by a member different from the second support member, the seat portion is supported by a forward inertial force. When the second support member is displaced upward, the seat portion of the seat is not displaced forward by the upward displacement of the second support member. In addition, the seat is displaced by the upward displacement of the second support member. Is not displaced upward, which is further advantageous in that the seated occupant is properly prevented from moving forward and sinking with respect to the seat.

According to the second aspect of the present invention, a relatively large moment is generated due to the backrest of the seat due to the inertial force in the forward direction, and the second support member is reliably displaced upward. The upward displacement of the second support member is mechanically transmitted to the movement inhibiting member by the linking means, and the movement inhibiting member surely moves upward, so that the seated occupant moves forward with respect to the seat. This is advantageous in that it accurately prevents the sinking state.

According to the features of claim 3, claim 1 or 2
"Effects of the Invention" of Claim 1 or 2 as in the case of
In addition to this “effect of the invention”, the following “effect of the invention” is provided. According to the feature of claim 3, even if the second support member is displaced forward (upward) due to the inertia force forward, the movement preventing member moves upward without being displaced, and the seated occupant is seated. The movement-preventing member stably prevents the state in which the occupant moves forward and sinks, so that the seated occupant can accurately move forward and sink in the seat. In terms of blocking.

According to the present invention, when the second support member for supporting the seat portion of the seat is supported by the first support member supported on the vehicle body so as to be displaced forward, According to the feature of item 3, when the second support member (the seat portion of the seat) is displaced forward by the inertia force forward, the movement preventing member that has moved upward moves with respect to the second support member (the seat portion of the seat). The seat is displaced relatively rearward, and the crotch of the occupant who moves forward and sinks with respect to the seat portion of the seat,
Since the movement preventing member is pressed relatively rearward, it is advantageous in that the seated occupant appropriately blocks the state in which the occupant moves forward and sinks with respect to the seat.

According to the feature of claim 4, the "effects of the invention" of the claims 1 to 3 are provided similarly to any one of the claims 1 to 3, and the "effects of the invention" are included in the "effects of the invention". In addition, it has the following "effects of the invention". According to the feature of the fourth aspect, even when the occupant gets on and off the vehicle in the normal use state or adjusts the position of the seat in the front-rear direction, the second state is maintained.
Since the state where the support member moves forward (upward) does not occur, the seat can be used without any trouble in a normal use state.

According to the feature of claim 5, the "effect of the invention" of the claims 1 to 4 is provided similarly to the case of any one of the claims 1 to 4, and the "effect of the invention" is included in the "effect of the invention". In addition, it has the following "effects of the invention". According to the feature of the fifth aspect, the position of the seat in the front-rear direction can be adjusted without hindrance by supporting the first support member on the guide member fixed to the vehicle body along the front-rear direction so that the position can be changed and the position can be fixed. Therefore, the seat can be used without any trouble in a normal use state.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of the vicinity of first and second support members in a normal use state.

FIG. 2 is a view showing a state in which a large forward inertia force equal to or higher than a set value
Longitudinal side view near the first and second support members with the support member displaced forward

FIG. 3 is a longitudinal sectional side view showing the vicinity of first and second support members in a normal use state in the first alternative embodiment of the invention;

FIG. 4 is a vertical sectional side view showing the vicinity of first and second support members in a normal use state according to a second alternative embodiment of the present invention;

FIG. 5 is a longitudinal sectional side view of the vicinity of the first and second support members in a state where the second support member is displaced upward by a large forward inertial force equal to or larger than a set value in the second alternative embodiment of the invention;

FIG. 6 is a cross-sectional plan view of the vicinity of the first and second support members in a normal use state according to a second alternative embodiment of the invention;

[Description of Signs] 1 Seat 1a Seat seat 1b Seat backrest 2 Guide member 4,15 First support member 5,22 Second support member 7,9,14,17,20,21,23,25 Holding Means 6,16,19 Linking means 8,18 Movement inhibiting member

Claims (5)

[Claims] 1. A vehicle comprising: a first support member supported on a vehicle body side; and a second support member for supporting a seat portion of a seat, wherein the second support member is displaced forward by an inertia force forward. The second support member is movably supported by the first support member, and is positioned below the seat portion of the seat and moves upward, so that the seated occupant can move relative to the seat portion of the seat. A movement inhibiting member for inhibiting a state of moving forward; mechanically transmitting a displacement of the second support member due to a forward inertial force to the movement inhibiting member to move the movement inhibiting member upward; Vehicle seat structure provided with linking means. 2. A vehicle comprising: a first support member supported on a vehicle body side; and a second support member for supporting a seat back portion, wherein the second support member is displaced upward by an inertia force forward. The second support member is swingably supported around a horizontal axis of the first support member, and is positioned below a seat portion of the seat and moves upward, so that a seated occupant can move the seat. A movement inhibiting member for preventing a state of moving forward with respect to the seat portion, and mechanically transmitting a displacement of the second support member due to a forward inertial force to the movement inhibiting member, thereby preventing the movement. A vehicle seat structure provided with a linking means for moving a member upward. 3. The vehicle seat structure according to claim 1, wherein the first support member includes the movement preventing member. 4. When the forward inertial force is less than a set value,
Holding means is provided for holding the second support member so as to prevent the displacement of the second support member and allow the displacement of the second support member when the forward inertial force exceeds a set value. The vehicle seat structure according to claim 1. 5. A guide member fixed to a vehicle body, wherein:
The vehicle seat structure according to any one of claims 1 to 4, wherein the supporting member is supported so as to be freely position-changeable and position-fixable along the front-rear direction.