JPH07132766A - Seat device - Google Patents

Abstract

PURPOSE:To provide a seat device which is constituted to sharply improve protection capacity of a passenger against a shock in the longitudinal direction of a car body as a reclining function is kept. CONSTITUTION:An upper end is slidably supported to the side of a frame between the side of a seat frame 6 and a seat slide 4 and a side bar 8 having a pivotal support part 8a is arranged to a lower end part. A reclining mechanism 10 to vary the upper end position of the upper end position of the side bar 8 is provided. An operation lever 25 to operate the reclining mechanism is provided, the pivotal support part 8a of the side bar 8 is longitudinally movably supported to the front, and the rear of a seat and usually regulated to a home position. A damping mechanism 30 is provided for effecting damping through resilient deformation of a resin member by transmitting the shock to the resin member when a shock higher than a given value is exerted. This constitution absorbs shock energy regardless of the magnitude of a shock during a time starting from the generation of the shock and ending to reduction of the generation of the shock to zero unlike absorption of shock energy which is effected by rigidity of a conventional bracket and absorbs sock energy which is heretofore not absorbed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat device capable of protecting an occupant seated on a seat from a shock from the front-back direction of the seat.

[0002]

2. Description of the Related Art Conventionally, a front seat of a passenger car has a structure in which a seat cushion and a seat back are connected via a gear type reclining mechanism. Specifically, as shown in FIG.
The seat a is provided with a base bracket e on an upper rail d on one side of a pair of seat slides c supporting a seat cushion b.
And a seat back frame supporting the seat back f.
A support bracket i is provided at an end of a frame portion h, which is one side in the width direction of the frame g, and a support bracket i is provided between the brackets e and i.
The tobacco f is rotatably supported in the front-rear direction. j
Indicates its pivot axis.

An arcuate reclining gear k having a radius of the pivot shaft j is provided at an arc portion of the support bracket i around the pivot shaft j. Further, the base bracket e is provided with a lever m with a gear that can be engaged with and disengaged from the reclining gear k, and a lock pin n for locking the lever m with the gear. The seat back f can be reclined to a desired angle by engaging and disengaging the lever with gear m with respect to the reclining gear k.

[0004]

By the way, an automobile may be collided from a rear portion of a vehicle body, that is, a rear collision. Recently, attention has been paid to the behavior of an occupant seated at the front against this collision.

That is, in the conventional front seat a, the reclining gear j and the gear n of the lever k that engages and disengages with the reclining gear j are received because the gears receive the load from the seat back f.
The parts with high rigidity are used for.

Therefore, when the conventional front seat a is collided from the rear part of the vehicle body as shown by the hatched arrow in FIG. 10, its reaction force is weak in rigidity, that is, the seat back frame. The bracket i may be concentrated on the support bracket i connected to the frame f, and the bracket i may be buckled to bend backward as shown by a chain double-dashed line in FIG.

However, although the support bracket i has the ability to absorb the impact energy of a rear impact until it bends, the energy of the support bracket i once it begins to bend.
The ability to absorb is said to be lost.

Therefore, the front seat a employing the conventional clinching mechanism has a limit in protecting the occupant from the impact from the rear collision. The present invention has been made in view of such circumstances, and its purpose is to:
It is an object of the present invention to provide a seat device in which the ability to protect an occupant against a shock in the front-rear direction of a vehicle body is dramatically improved while maintaining a reclining function.

[0009]

In order to achieve the above object, a seat apparatus according to a first aspect of the present invention is a frame which extends in a vertical direction of a seat back frame which supports a seat back.
An upper end portion is slidably supported along the vertical direction of the frame portion between a frame portion and a support portion that supports a seat cushion, and a lower end portion is supported by the support portion before and after the seat. A bar member pivotally supported in a direction is provided, and a lock mechanism is provided for varying the support position of the upper end portion of the bar member by locking and unlocking. A reclining mechanism that pivotally moves forward and backward in accordance with the pivotal displacement of the bar member with the pivot portion as a fulcrum is provided, and an operating portion for operating the reclining mechanism is provided, and the pivotal portion of the bar member serves as a seat. A support means is provided for supporting the seat in such a manner that it can move in the front-rear direction, and the pivotal support is normally restricted to a fixed position in the front-rear direction of the seat. From the local branch The Waru impact transmitted to the damping member is in the provision of the damping mechanism to damp.

According to a second aspect of the present invention, in order to make it possible to generate a high damping capacity with a simple structure, the seat apparatus includes a support portion for supporting the seat cushion. A tubular guide body extending along the front-rear direction of the seat, and a slide member slidably inserted into the guide body and slidable in the front-rear direction of the seat together with the pivotal support. The slider is arranged so as to sandwich it from the front and back, and has an attenuator that absorbs impact energy by elastically displacing when an impact of a predetermined amount or more is applied to the slider.

[0011]

According to the sheet apparatus of the present invention, the locking mechanism of the reclining mechanism is operated by the operating portion to move the bar.
When the support position of the upper end portion of the member is changed, the seat back frame is pivotally displaced by the forward and backward rotation of the seat with the lower end portion of the bar member as a fulcrum.

As a result, the seat back can be tilted to the desired reclining position as in the conventional case. It is assumed that, for example, the impact of a collision in the rear part of the vehicle body is applied to the seat defined in the reclining position.

Then, the pivotal support portion of the bar member, which was restricted at the fixed position in the front-rear direction of the seat, is released, and the above-mentioned impact applied through the bar member is transmitted to the attenuator. As a result, the impact energy applied to the sheet is absorbed by the attenuator.

The absorption of the impact energy is different from the absorption of the impact energy obtained by the rigidity of the conventional bracket, regardless of the magnitude of the impact force, it continues from when the impact occurs until the impact disappears. It is also possible to absorb impact energy that could not be absorbed until now.

As a result, the occupant sitting on the seat is protected from the impact of a collision with a high protective ability. According to the seat apparatus of claim 2, for example, at the moment when the impact of a collision is applied to the rear part of the vehicle body, the damping body undergoes elastic displacement,
The impact energy input from the slider is absorbed.

In other words, it is possible to generate a high damping capacity and to provide a high protection capacity to the sheet by a damping mechanism having a simple structure in which damping bodies are provided on both sides of the slider.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in FIGS. In FIG. 1, reference numeral 1 denotes a front seat, for example, on the driver side, installed at the front of a passenger car (vehicle) to which the present invention is applied.

The front seat 1 is a seat cushion 2
And a seat back 3 that rises upward from the rear portion of the seat cushion 2. Both sides in the width direction of the lower portion of the sheet cushion 2 are installed on the floor panel 5 via a pair of sheet slides 4 and 4.

That is, the seat slides 4 and 4 are lower layers which are installed on the floor panel 5 and extend in the front-rear direction of the seat.
Seat 4a and a seat fixed to the bottom of the seat cushion 2.
And an upper rail 4b extending in the front-rear direction.
The two rails 4a and 4b are slidably meshed with each other, and the front seat 1 is supported so as to be displaced along the longitudinal direction of the vehicle body. Incidentally, 4c is a mounting seat provided at the front and rear ends of the lower rail 3a.

The seat back frame 6 for supporting the seat back 3 is formed by forming a pipe member into a U-shape, for example, in accordance with the shape of both side portions and the upper edge portion of the seat back 3. Both ends of the seat back frame 6 are rotatably supported by the side wall portions of the rear portion of the upper rail 4b via hinges 7, respectively. Thereby, the seat back 3 can be rotated in the front-rear direction of the vehicle body with the hinge portions 7, 7 as fulcrums. The seat back frame 6 is provided with an urging force directed in the forward direction by an urging mechanism (not shown) for returning the seat back 3.

On the other hand, among the pipe portions on both sides constituting the seat back frame 6, the lower portion of the frame portion 6a located on the center side of the passenger compartment (the side opposite to the door) is on the same side as the lower portion. A side bar 8 (corresponding to a bar member) is slid across the central portion of the upper rail 4b of the slide slide 4.

The side bar 8 has a pivot portion 8a at the lower end.
With. The upper end of the side bar 8 has a reclining mechanism 1 provided in a frame portion 6a extending in the vertical direction.
It is slidably supported by the frame portion 6a.

4 to 7 show the structure of the reclining mechanism 10. Reclining mechanism 1
Describing 0, 11 is a pair of upper and lower stoppers-1
The rack teeth are provided in the moving area δ of the frame portion 6a defined by 2 and 12. The rack teeth 11 are formed by arranging a plurality of arc-shaped gears 13a in the axial direction on the outer peripheral surface of the moving region δ at predetermined intervals. The gears 13a are all facing forward of the seat.

A lock mechanism 14 is attached to the moving area δ to form a reclining mechanism 10. The lock mechanism 14 has a frame as shown in FIGS.
The cylindrical slider-1 which is inserted into the movement region δ of the cam portion 6a.
Have five.

The inner cavity 15b of the slider 15 has the gear 1
It is formed in a tubular shape having a cross-sectional shape corresponding to the cross-sectional shape of the frame portion 6a including 3a, that is, a cross-sectional shape obtained by combining a circular shape and a fan shape. As a result, the entire slider 15 can be slid along the movement area δ. An upper end portion of the side bar 8 is rotatably supported on a front outer peripheral surface portion of the slider 15 via a bracket 16 protruding from the front portion. In addition, 16a shows the same pivot.

A cylindrical inner gear 17 is interposed between the inner peripheral surface of the slider 15 and the outer peripheral surface of the frame portion 6a so as to surround the frame portion 6a. The inner gear 17 is rotatably accommodated in a step portion 15a (shown in FIG. 7) formed on the circular inner surface of the slider 15. As a result, the inner gear 17 can freely rotate around the frame portion 6a, but the frame portion 6a does not rotate.
It is arranged so that it cannot be displaced in the axial direction of a (step 15
The upper and lower wall surfaces 15c of "a" act as a barrier to regulate the axial movement of the inner gear 17).

As shown in FIG. 7, the inner gear 17 has a band-shaped notch 18 through which the gear train of the rack teeth 11 penetrates in a part of the peripheral wall. Further, a plurality of stages of lock grooves 19 formed by pores extending in the circumferential direction from the same edge portion are provided at the left edge portion of the cutout portion 18. The lock groove 19 has a length dimension and a width dimension so that the entire gear 13a can be inserted and removed, and the gear 13a existing in the movement region δ can be inserted and extracted.

As a result, the slider 15 is moved to the inner side.
When the cutout portion 18 of the gear 17 is positioned in the gear train of the lap teeth 11, it becomes slidable (unlocked) with respect to the frame portion 6a, and the lock groove 19 of the inner gear 17 becomes the gear train of the rack teeth 11. When positioned, the lock groove 19 and the gear 13a are engaged with each other to lock the frame portion 6a.

That is, the supporting position of the slider 15 can be varied within the moving region δ by selectively engaging the lock groove 19 of the inner gear 17 with the gears 13a arranged side by side. .

The side bar 8 is adapted to rotate about the lower pivotal support portion 8a as a fulcrum by changing the supporting position of the slider-15. That is, the seat back 3 can be rotationally displaced forward and backward of the front seat 1, that is, reclining.

A drive piece 20 is provided so as to project on the outer peripheral surface of the inner gear 17 adjacent to the lock groove 19. The drive piece 20 slidably penetrates a groove-shaped hole 21 provided in the peripheral wall of the slider-15 and projects to the outside of the slider-15.

The holes 21 are formed along the circumferential direction of the slider-15. Further, as shown in FIG. 5, the left end of the hole 21 is positioned at a position where the lock groove 19 and the gear 13a match, and the right end is positioned at a position where the cutout portion 18 and the gear 13a match. That is, drive piece 2
If 0 is moved to the left end of the hole 21, the slider-1
When the slider 5 is locked to the frame portion 6a and is moved to the right end of the hole 21, the slider 15 is unlocked.

A spring 20a for urging the driving piece 20 toward the lock side is connected to the driving piece 20. That is, the lock mechanism 14 is always positioned on the lock side.

Further, the driving piece 20 includes an operation wire-22.
One end of is connected. On the other end side of the operation wire 22, a wire guide 23 protruding in the outer peripheral portion of the slider 15 in parallel with the hole 21 and a wire guide 24 protruding in the outer peripheral portion immediately below the wire guide 23 are provided. After that, for example, it extends to the front portion of the upper rail 4b of the seat slide 4 located on the center side of the vehicle body. And this operation wire-2
The other end of 2 is connected to an operation lever 25 (corresponding to an operation portion) rotatably supported on a side wall portion of the upper rail 5b, and when the operation lever 24 is rotated, an operation wire- 22
Is retracted, that is, the drive piece 20 can be operated from the locked position to the unlocked position.

Thus, the reclining mechanism 10 can be operated in accordance with the turning operation of the operation lever 24. Reference numeral 22a is a cover of the operation wire-22.
Indicates.

On the other hand, the pivot portion 8a of the side bar 8 is a seat.
The front slide 1 is movably supported by a damping mechanism 30 installed at the center of the upper rail 4b of the slide 4.

The structure of the damping mechanism 30 is shown in FIGS. 8 and 9. The damping mechanism 30 will be described. Reference numeral 31 is a tubular guide body installed on the upper surface of the upper rail 4b, which serves as a support portion of the seat cushion 2, along the upper rail 4b. Both ends of the guide body 31 are closed.

Inside the guide body 31, the guide body 31
A short columnar slider 32 is fitted in and slidable along. A pivot 33 is projectingly provided on an outer peripheral portion of the slider 32 facing the right side of the front sheet 1.

The pivot 33 slidably penetrates an elongated hole 34 provided in a peripheral wall of the guide body 31, and projects outside the guide body 31. The long hole 34 extends along the axial direction of the guide body 31.

The lower end of the side bar 8 is rotatably connected to the penetrating end of the pivot 33 to form a pivot 8a.
In the guide body 31, for example, a deformable tubular resin member 35 is fitted in front of and behind the slider 32 so as to sandwich the slider 32. A short columnar hard elastic body 36 made of rubber or the like is interposed in the gap between the resin member 35 and the end of the slider 32.
The slider 32 is positioned at a predetermined position, for example, the center of the guide body 31 in the axial direction.

Each of the resin members 35 is a slider 32.
A member is used that has the rigidity to regulate the movement of the same and that has a characteristic of absorbing elastic force (displacement) when the impact of a predetermined amount or more is applied to absorb the impact energy.

As a result, the damping mechanism 39 normally restricts the pivotal support portion 8a of the side bar 8 to a fixed position by the resin members 35, 35 on both sides, so that the front seat 1 is impacted by a predetermined amount or more from the front or the rear. Is applied, the front side resin member 35 or the rear side resin member 35 elastically deforms to release the regulation of the pivotal support portion 8a and absorb (attenuate) the impact energy transmitted from the slider 32. There is.

The long hole 34 is set to have a length dimension that does not impair the impact energy absorption performance of the resin member 35. Next, the operation of the sheet device thus constructed will be described.

When seating on the front seat 1 and reclining the seat back 3 in a desired posture,
First, the operating lever 25 is rotated with fingers while still sitting on the front sheet 1.

As a result, the operation wire 22 is pulled in, and the drive piece 20 is slid from the lock position at the left end of the hole 21 shown in FIG. 5A to the unlock position at the right end shown in FIG. 5B.

Then, the inner gear 17 in the slider 15 is rotationally displaced in the counterclockwise direction, and as shown in FIG. The notch 18 is positioned relative to it.

Since the notch 18 is formed as a band-shaped opening through which the lap tooth 11 penetrates, the lock with respect to the rack tooth 11 is released. As a result, the slider 15 can slide upward or downward along the frame portion 6a.

Thereafter, the upper body of the seated occupant is bent, for example, rearward (or frontward) to find a desired posture. At this time, the pivot portion 8a of the seat back frame 6
Is regulated at a fixed position by the resin member 35 and the elastic body 36.

Therefore, the seat back frame 6 is pivotally displaced rearward (or forward) with the lower pivot 33 in a fixed position as a fulcrum while the slider 15 slides on the frame portion 6a. I will do it.

When the desired posture is determined, the fingers are released from the operation lever 25. Thereby, the drive piece 20 is
The elastic force accumulated in the spring 20a returns from the unlock position to the lock position again.

In response to the movement of the driving piece 20, the inner
The gear 17 is rotationally displaced so that the lock groove 19 is located again at the portion where the rack tooth 11 is present, and the lock groove 19 meshes with the gear 13 a of the rack tooth 11.

As a result, the slider 15 is supported at different points on the frame portion 6a, as shown by the alternate long and short dash line in FIG. 2, and holds the seatback 3 at a desired reclining position.

That is, as in the conventional case, the seat back 3 is
It is possible to incline to a desired reclining position. After such reclining, while driving a passenger car,
For example, assume that a collision occurs at the rear of the vehicle body.

Then, at the moment when the impact of the collision is applied to the rear portion of the vehicle body, the resin member 35 on the rear side of the damping mechanism 30 is moved to the pivot 33.
The impact transmitted from the slider 32 through the slider 32 causes elastic displacement, and absorbs the impact energy input from the slider 32.

With the absorption of this impact energy, FIG.
In the middle, as indicated by the hatched arrow and the one-dot chain line A, the pivot portion 8a of the seatback 3 is gradually displaced rearward to protect the occupant from impact.

When a collision occurs at the front of the vehicle body, the resin member 35 on the front side of the damping mechanism 30 similarly undergoes elastic displacement due to the impact transmitted from the pivot 33 through the slider 32, and is input from the slider 32. It absorbs the impact energy that is generated.

With the absorption of this impact energy, FIG.
In the middle, as indicated by the hatched arrow and the one-dot chain line of reference numeral B, the pivotal support portion 8a of the seatback 3 is gradually displaced forward to protect the occupant from impact. At this time, the occupant seated on the front seat 1 is supposed to be held on the front seat 1 by a seat belt device (not shown).

Unlike the absorption of the impact energy obtained by the conventional rigidity of the bracket, the absorption of the impact energy continues regardless of the magnitude of the impact force from when the impact occurs until the impact disappears. .

Therefore, it is possible to absorb the impact energy which could not be absorbed up to now, and it is possible to protect the occupant sitting on the front seat 1 from the impact of a collision with high protection ability.

Moreover, the damping mechanism 30 includes the slider 32.
With a simple structure in which the resin member 35 having a damping action is provided on both sides of the sheet, a high damping ability can be generated, and a high protection ability can be provided to the front sheet 1. Although the present invention is applied to the front sheet in the above-described embodiment, it may be applied to other sheets.

[0061]

As described above, according to the invention described in claim 1, the ability to protect the occupant against a shock in the longitudinal direction of the vehicle body can be dramatically improved while maintaining the reclining function.

According to the second aspect of the present invention, in addition to the effect of the first aspect, it is possible to generate a high damping capacity with a simple structure and to bring a high protection capacity to the sheet. it can.

[Brief description of drawings]

FIG. 1 is a front seat of a vehicle according to an embodiment of the present invention,
The perspective view shown with the structure which damps an impact.

FIG. 2 is a view for explaining when the front seat reclines.

FIG. 3 is a diagram for explaining a process in which the front seat attenuates an impact from a front portion or a rear portion of the vehicle body and protects an occupant from the impact.

FIG. 4 is a side view showing an enlarged reclining mechanism.

5A is a cross-sectional view showing a state in which a lock mechanism taken along line XX in FIG. 4 is locked. FIG. 6B is a sectional view showing a state where the lock mechanism is unlocked.

FIG. 6 is a sectional view taken along the line YY in FIG.

FIG. 7 is an exploded perspective view for explaining a lock mechanism.

FIG. 8 is an enlarged side view showing a damping mechanism.

FIG. 9 is an exploded perspective view for explaining the damping mechanism.

FIG. 10 is a perspective view showing a front sheet of a conventional vehicle together with a state when an impact is applied from the rear portion of the vehicle body.

[Explanation of symbols]

1 ... Front sheet 2 ... Sheet cushion 3 ... Sheet back 4 ... Sheet slide (supporting portion) 6 ... Sheet back frame 7 ... Hinge portion 8 ... Side bar (bar member) 10 ... Reclining Mechanism 11 ... Rack teeth 14 ... Lock mechanism 15 ... Slider 17 ... Inner
Gear 18 ... Notch 19 ... Lock groove 20 ... Driving piece 22 ... Operation wire-25 ... Operation lever (operation section) 30 ... Damping mechanism 31 ... Guide body 32 ... Slider 33 ... Axis 34 ... Long hole 35 ... Resin member (Attenuator) 36 ... Elastic body

Claims (2)

[Claims] 1. A sheet having a seat back and a seat cushion rotatable in the front-rear direction, and a frame extending in the up-down direction of a seat back frame supporting the seat back. An upper end portion disposed between a frame portion and a support portion that supports the sheet cushion, is slidably supported along the vertical direction of the frame portion, and a lower end portion is supported by the support portion. The seat back comprises a bar member pivotally supported in the front-rear direction of the seat, and a lock mechanism for changing the support position of the upper end of the bar member by locking and unlocking. , A reclining mechanism for rotationally displacing back and forth according to the rotational displacement of the bar member with the pivotal supporting portion of the bar member as a fulcrum, an operating portion for operating the reclining mechanism, and a pivotal supporting portion of the bar member. In the front-back direction of the seat Support means for rotatably supporting, it has a damping body for damping the impact force, the pivot portion,
Normally, the seat is regulated to a fixed position in the front-rear direction, and the seat is fixed.
The seat is provided with a damping mechanism for releasing the regulation of the pivotal support portion and transmitting the impact transmitted from the pivotal support portion to the attenuating body in response to an impact more than a predetermined amount from the front-rear direction of the vehicle. apparatus. 2. The damping mechanism includes a tubular guide body extending along the front-rear direction of the seat, which is installed in a support portion that supports the seat cushion, and is slidably fitted in the guide body. The inserted slide, which slides in the front-rear direction of the seat together with the pivot, and the slide, which is arranged so as to sandwich the slide from the front and the back, elastically displaces when a predetermined impact or more is applied. Impact energy
The sheet apparatus according to claim 1, further comprising an attenuator that absorbs.