JP2008230557A - Seat sitting part and vehicular seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently absorb energy at rear-end collision and to disperse load to an occupant's back. <P>SOLUTION: The seat sitting part 2 is provided with a support member 23 for supporting a seat back 3; and a seat sitting part body 20 connected to the support member 23. The support member 23 and the seat sitting part body 20 are connected to each other through a shaft member 40, a circular through hole 51 making the shaft member 40 as a center is provided on one of the support member 23 and the seat sitting part body 20. A shaft attachment member 50 inserted to the through hole 51 is provided on the other, and the support member 23 and the seat sitting part body 20 are fastened by the shaft attachment members 50, 52. When the load is applied in a direction rearwardly inclining the seat back 3, the support member 23 is rotated making the shaft member 40 as a center, and the energy at the rear-end collision is efficiently absorbed by friction of the shaft attachment members 50, 52 or the support member 23 and the seat sitting part body 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seat for absorbing a shock at the time of a rear collision and a vehicle seat.

  Conventionally, when a so-called rear collision occurs, such as when a car collides in the middle of retreating or is rear-projected, the head of the seated occupant tilts backward rapidly due to inertial movement, and the neck There is a risk of impact on the part.

  Therefore, in recent years, various techniques for safely protecting a passenger's head and neck from an impact at the time of a rear collision have been applied to a vehicle seat such as an automobile. As one of such techniques, there is a technique for mitigating the impact on the occupant during a rear-end collision.

  For example, in Patent Document 1, a seat back is attached to a reclining device with a mounting bolt, and a plurality of holes partitioned by a partition wall are formed in the seat back, and an engagement pin inserted into one of the holes is a reclining device. And a technique for mitigating impact at the time of rear collision by breaking a partition wall with an engaging pin.

Further, in Patent Document 2, a bolt is provided on the seat back, a bolt hole through which the bolt is inserted on the reclining device side, and a guide groove that extends rearward from the bolt hole and narrower than the bolt diameter are provided. A technique is described in which a seat back moves back along a guide groove while a bolt deforms the guide groove at the time of a rear impact, thereby reducing the impact at the time of the rear impact.
JP-A-10-278644 JP 2005-186670 A

  Since the higher the efficiency of mitigating the impact, the better. Therefore, it is desired by automobile users to absorb the energy at the time of rear impact more efficiently and to mitigate the impact. However, in the technique described in Patent Document 1, since the absorption of the impact is intermittently performed when the partition wall is broken, the efficiency of reducing the impact is not high.

  In the technique described in Patent Document 2, the lower portion of the seat back moves backward along the guide groove, while the headrest moves toward the head of the occupant and supports the occupant's head. Could not be dispersed.

  An object of the present invention is to provide a seat seat and a vehicle seat that can efficiently absorb energy at the time of a rear collision and can disperse a load on the back of an occupant.

  According to a first aspect of the present invention, in the seat seat portion that supports the seat back, the seat seat portion includes a support member that supports the seat back, and a seat seat portion body that is coupled to the support member, The seat seat body is connected to each other via a shaft member, and one of the support member and the seat seat body is provided with an arc-shaped through-hole centered on the shaft member, and the other. Is provided with a shaft attachment member inserted through the through hole, and the support member and the seat seat body are fastened by the shaft attachment member.

  According to a second aspect of the present invention, in the seat seat according to the first aspect, the support member rotates about the shaft member when a load is applied in a direction in which the seat back is inclined backward. The load is absorbed by the friction between the shaft-attaching member or the support member and the seat seat body.

  According to a third aspect of the present invention, in the seat seat portion according to the first or second aspect, the seat seat main body is provided with two side frames that are spaced apart in the left-right direction and extend in the front-rear direction. The support member is connected to rear end portions of the two side frames.

  Invention of Claim 4 is a vehicle seat, Comprising: The seat seat part as described in any one of Claims 1-3, and a seat back are provided, The said supporting member is fixed to the said seat back. And a reclining mechanism for tilting the seat back backward based on the operation of the occupant.

  ADVANTAGE OF THE INVENTION According to this invention, while absorbing the energy at the time of a rear collision efficiently, a load can be disperse | distributed to a passenger | crew's back.

  Embodiments of a vehicle seat according to the present invention will be described below with reference to the drawings. However, the embodiments described below are given various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

FIG. 1 is a perspective view showing a schematic configuration of a vehicle seat 1 according to the present invention.
As shown in this figure, the vehicle seat 1 includes a seat portion 2 on a base frame 10 connected to a floor of a vehicle (not shown).

  The base frame 10 includes a position adjusting mechanism 11 for adjusting the position of the seat seat 2 in the front-rear direction and a height adjusting mechanism 12 for adjusting the height of the seat. In addition, conventionally well-known things can be used as such a position adjustment mechanism part 11 and height adjustment mechanism part 12. FIG.

The seat seat portion 2 includes a seat seat body 20 that is covered with a cushion or the like (not shown) and supports the occupant's buttocks from below, and a support member 23 that includes the reclining mechanism portion 6.
The seat seat body 20 is a U-shaped frame in plan view, and is provided with two side frames 21 that are spaced apart in the left-right direction and extend in the front-rear direction, and 2 that extend in the left-right direction. A front frame 22 connecting the front end portions of the side frames 31 of the book.
A support member 23 is connected to the rear portion of the side frame 21.

2 is a side view showing a connecting portion of the support member 23 to the side frame 21, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG. As shown in FIG. 2, the connecting portion of the support member 23 to the side frame 21 is provided with an insertion hole 41 through which a pin 40 protruding from the side frame 21 is inserted, and a bolt protruding toward the side frame 21. An insertion hole 53 through which 50 is inserted is provided. In FIG. 2, the pin 40 is disposed on the rear side and the bolt 50 is disposed on the front side.
A pin 40 is fixed to the side frame 21, and an arc-shaped through hole 51 centered on the pin 40 is provided, and a bolt 50 is inserted through the through hole 51.

  As shown in FIG. 3, the bolt 50 is inserted into the insertion hole 53 and the through hole 51 from the support member 23 side. A nut 52 is screwed onto the tip of the bolt 50 from the side frame 21 side, and the nut 52 is abutted against the edge of the through hole 51 by being fastened to the bolt 50.

  The pin 40 is inserted into the insertion hole 41, and the bolt 50 is inserted into the insertion hole 53 and the through hole 51 and is tightened by the nut 52, whereby the side frame 21 is fixed to the support member 23.

  A reclining mechanism 6 for fixing the seat back 3 is provided at the rear end of the support member 23, and the support member 23 supports the seat back 3 from below. The reclining mechanism section 6 is fixed to the seat seat section 2 and tilts the seat back 3 backward based on the operation of the occupant. The reclining mechanism 6 is provided with a handle (not shown) for adjusting the angle of the seat back 3. As such a reclining mechanism part 6, conventionally well-known things, such as what is disclosed by Unexamined-Japanese-Patent No. 10-276850, Unexamined-Japanese-Patent No. 8-253063, and WO2004 / 017797A1, can be used, for example.

  The seat back 3 includes a seat back main body 30 that is covered with a cushion or the like (not shown) and supports the back of the occupant from the rear, and a lower frame 33. Although not shown in FIG. 1, a headrest H is provided at the upper end of the seat back body 30 (see FIG. 4). The headrest H may be provided integrally with the seat back body 30 or may be provided so as to be movable in the vertical direction with respect to the seat back body 30.

  The seat back body 30 is a substantially U-shaped frame body in a front view, and is provided with two side frames 31 that are spaced apart in the left-right direction and extend in the up-down direction, and 2 in the left-right direction. And an upper frame 32 that connects the upper ends of the side frames 31 of the book.

A lower frame 33 that is fixed to the above-described reclining mechanism unit 6 and supports the seat back main body 30 from below is disposed below the seat back main body 30.
The lower frame 33 is a member extending in the left-right direction, and is connected to the lower ends of the two side frames 31.

Next, the operation of the vehicle seat 1 at the time of a vehicle rear collision will be described.
4A is a side view conceptually showing the state of the vehicle seat 1 after the rear collision, and FIG. 4B is a conceptual view of the state of the vehicle seat 1 after the rear collision.
First, when a larger load than usual is applied to the seat back 3 from the occupant C, such as when the vehicle is bumped rearward from the state shown in FIG. 4A, the seat back 3 and the support member 23 are moved. Attempts to rotate about pin 40. For this reason, a load is applied in the direction in which the bolt 50 rotates rearward along the through hole 51.

  When the load applied to the bolt 50 exceeds the frictional force between the nut 52 and the edge of the through hole 51, the bolt 50 moves along the through hole 51, and the seat back 3 and the support member 23 rotate about the pin 40. .

  At this time, since the nut 52 is fastened to the bolt 50, the impact energy is released as frictional heat as the bolt 50 moves along the through hole 51. When the side frame 21 and the support member 23 are in contact with each other, the impact energy is released as frictional heat between the side frame 21 and the support member 23.

  When the displacement amount of the bolt 50 is the largest, the bolt 50 is disposed at the upper end portion of the through hole 51 as shown in FIG. As a result, the seat back 3 and the support member 23 are inclined about 5 to 20 degrees rearward with the pin 40 as the center.

  Thus, the impact energy applied from the occupant C to the seat back 3 due to the rear impact of the vehicle is released as frictional heat due to friction between the nut 52 and the edge of the through hole 51, and thus absorbs the impact. be able to. Further, since the seat back 3 and the support member 23 are inclined rearward as a whole while absorbing impact energy by friction between the nut 52 and the edge of the through hole 51, the load can be distributed over the entire back of the occupant C. The load can be prevented from concentrating on the occupant's C neck. Therefore, the occupant C can be protected more safely.

  Further, since the impact is absorbed while the seat back body 30 is tilted by about 5 to 20 °, there is little possibility of harming the rear seat occupant.

  The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

For example, in the above embodiment, the bolt 50 is inserted into the through hole 51 from the support member 23 side and the nut 52 is tightened from the side frame 21 side, but the bolt 50 is inserted into the through hole 51 from the side frame 21 side, The nuts 52 may be tightened from the support member 23 side after the bolts 50 are inserted into the holes provided in the support member 23.
Alternatively, the side frame 21 may be thickened along the through hole 51, and the frictional force may be increased as the bolt 50 moves along the through hole 51.

  Moreover, in the said embodiment, although the pin 40 was used as a shaft member, you may use a volt | bolt. Further, a bolt may be provided on the side frame 21 side, and a through hole may be provided on the support member 23 side.

  Moreover, in the said embodiment, although the volt | bolt 50 and the nut 52 were used as a shaft attachment member which clamp | tightens the side frame 21 and the support member 23, this invention is not limited to this, A side frame is used using a rivet as a shaft attachment member. 21 and the support member 23 may be joined, or a combination of a pin and a push nut may be joined.

1 is a perspective view showing a schematic configuration of a vehicle seat 1 according to the present invention. 4 is a side view showing a connecting portion of the support member 23 to the side frame 21. FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. FIG. 2A is a side view conceptually showing a state of the vehicle seat 1 after a rear collision, and FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat seat part 20 Seat seat part main body 21 Side frame 23 Support member 3 Seat back 6 Reclining mechanism part 40 Pin (shaft member)
50 bolts
51 Through-hole 52 Nut (Axis mounting member)

Claims (4)

In the seat seat that supports the seat back,
A support member for supporting the seat back;
A seat base body connected to the support member;
With
The support member and the seat seat body are connected to each other via a shaft member,
One of the support member and the seat seat body is provided with an arc-shaped through-hole centered on the shaft member, and the other is provided with a shaft-attached member inserted through the through-hole.
The seat seat portion, wherein the support member and the seat seat portion main body are fastened by the pivot member. In the seat seat according to claim 1,
The support member rotates around the shaft member when a load is applied in a direction in which the seat back is inclined backward,
A seat seat portion that absorbs a load by friction between the shaft attachment member or the support member and the seat seat body. In the seat seat according to claim 1 or 2,
The seat base body has two side frames that are spaced apart in the left-right direction and extend in the front-rear direction,
The seat member, wherein the support member is connected to rear end portions of the two side frames. The seat seat according to any one of claims 1 to 3,
With seat back,
The vehicle seat, wherein the support member includes a reclining mechanism portion that is fixed to the seat back and tilts the seat back backward based on an operation of an occupant.

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