JPH06227298A - Car seat structure - Google Patents

Abstract

PURPOSE:To enhance the lumbar supporting performance for the person seated by furnishing an accommodation part to accommodate the bottom of the seat back at the tail of the seat cushion, wherein the tail of the seating surface is as deep as over the vertical moving amount located ahead of the seat back at all times. CONSTITUTION:An accommodation part 6 consisting of a vertical wall 2c and bottom 2a of the seat cushion is provided plumb under the bottom 1a of the seat back 1, wherein the vertical wall 2c is located in a position in slide contact with an a corner 1c. The height B of the vertical wall 2c is made more than the moving amount A of the seat cushion 2 generated by a vertical adjusting mechanism, and the bottom 2a of the accommodation part 6 is made so as to contact the bottom 1a of the seat back 1 when the seat cushion 2 is set in the uppermost position 20. Accordingly the front surface of the seat back 1 is positioned back in the horizontal position of the seating surface tail of the seat cushion 2 even though it is moved up and down, which precludes generation of gap between the two, and the lumbar supporting performance of the person seated can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat structure. More specifically, the present invention relates to a vehicle seat structure in which a seat cushion can be adjusted up and down.

[0002]

2. Description of the Related Art FIG. 5 (b) is a side view of a general seat, and shows a vehicle seat in which a seat cushion 13 can be vertically adjusted by an up / down adjusting mechanism (not shown). Arrow FR
Indicates the front of the vehicle and arrow UP indicates the upper side of the vehicle.
The uppermost position of the seat cushion 13 is shown. In such a seat, a gap G is formed between the seat cushion 13 and the lower end portion of the seat back 12 when the seat cushion 13 is positioned at the lowermost position, and the rear of the seat can be seen through, resulting in poor appearance. was there. A technique that solves this problem is disclosed in Japanese Utility Model Laid-Open No. 114435/1991. FIG. 5A shows a side view of the seat in this conventional technique. The seat cushion 11 has a seat structure in which the seat cushion 11 is moved up and down with respect to the seat back 10 by an up-and-down adjusting device (not shown). Two-dot chain line is seat cushion 1
3 shows the uppermost position. Rear end portion 1 of the seat cushion 11
A convex portion 11b is provided on the upper surface of 1a.
The height H of b is set to be higher than the clearance E between the lower end portion 10a of the seat back 10 and the seat cushion 11 which is formed when the seat cushion 11 is moved to the lowest position by the vertical adjustment device. By doing so, when the gap E is seen from the front of the seat, the rear of the seat is blocked by the convex portion 11b, and the appearance from the front of the seat is improved.

[0003]

However, in the above-mentioned prior art, the gap E between the lower end portion 10a of the seat back 10 and the seat cushion 11 which is formed when the seat cushion 11 is moved to the lowermost position by the vertical adjusting device is not filled. . FIG. 4 is a side view showing a state in which a person is seated on a general office chair, and in such a general office chair, a gap D exists between the backrest 4 and the seat surface 5. There is no problem in the normal seated state, but in the case of the vehicle seat,
It is not possible to obtain the force F2 supported by the waist portion 30 against the external force F1 from the leg portion due to the operation of the accelerator, brake, clutch or the like. Therefore, the occupant 3 exerts strength on the back and waist to maintain the posture, and tries to exert force F2.
However, driving for a long time had the problem that the back and waist became tired or painful. This problem is shown in FIG.
This is caused by the gap E of the above-mentioned conventional technique in (a). Therefore, an object of the present invention is to prevent the occurrence of a gap between the lower end portion of the seat back and the seat cushion by relatively displacing the lower end portion of the front surface of the seat back below the upper surface position of the seat cushion, and The presence of the seat back behind the lower back should improve the support of the lower back.

[0004]

In order to solve the above problems, a vehicle seat structure according to the present invention comprises a seat back and a seat cushion, and a seat cushion up-and-down adjusting mechanism for adjusting the seat cushion relative to the seat back. In a vehicle seat having an adjustable vertical position, a storage portion having a depth equal to or greater than a vertical movement amount of the seat cushion and storing a lower end portion of the seat back is provided at a rear end portion of the seat cushion, and The vertical movement range of the seat cushion is a range in which the rear end portion of the seating surface of the seat cushion is always positioned in front of the seat back.

[0005]

According to the above-mentioned means, even if the seat cushion is moved up and down by the seat cushion up-and-down adjusting mechanism, the front surface of the seat back is always located at the rear of the horizontal position of the rear end of the seat cushion, and A gap between the lower end portion and the seat cushion is prevented from being generated. And
When the seat cushion is moved upward, the lower end of the seat back is accommodated in the accommodating portion of the seat cushion, but the depth of the accommodating portion of the seat cushion is larger than the vertical movement amount of the seat cushion. There is no obstacle to vertical movement.

[0006]

Next, a first embodiment of the present invention will be described. FIG. 1 is a rear perspective view including a partial cross-section of a seat according to the first embodiment of the present invention, in which a part of the seat back 1 is cut to make it easier to understand the state of the accommodating portion 6. The arrow FR indicates the front of the vehicle and the arrow UP indicates the upper side of the vehicle. The seat cushion 2 is a seat that is vertically movable up and down with respect to the seat back 1 by a vertical adjustment mechanism (not shown), and an accommodation portion 6 including a bottom portion 2a and a vertical wall portion 2c is provided at a rear end portion of the seat cushion 2. Has been formed. In the figure, 1a is a seat back 1
Lower end portion, 1b is a front surface of the seat back 1, and 1c is a corner portion that is an intersection of the lower end portion 1a and the front surface 1b of the seat back 1,
Reference numerals 2b respectively indicate rear end portions of the seat cushion 2 on the seating surface. FIG. 2 is a side view showing a state in which the occupant 3 is seated on the seat in the first embodiment of the present invention, and shows the seat cushion 2 at the lowest position by an up / down adjusting mechanism (not shown). The broken line 20 indicates the uppermost position of the seat cushion 2. Vertical wall portion 2c and bottom portion 2
The accommodating portion 6 including a is a lower end portion 1 a of the seat back 1.
The vertical wall portion 2c of the accommodating portion 6 is provided in a vertically lower portion of the seat back 1 at a position in sliding contact with the corner portion 1c of the seat back 1. That is, the seat back 1 does not actually move, but when the seat back 1 is viewed from the seat cushion 2, it seems that the seat back 1 is moving relative to the seat cushion 2. If the movement relative to the seat cushion 2 is an apparent movement,
The vertical wall portion 2c is provided along the apparent trajectory drawn by the corner portion 1c of the seat back 1. Further, the height B of the vertical wall portion 2c of the accommodation portion 6 is equal to or greater than the movement amount A of the seat cushion 2 by a vertical adjustment mechanism (not shown), and the bottom portion 2a of the accommodation portion 6 is seated when the seat cushion 2 is at the uppermost position. It is configured to come into contact with the lower end portion 1a of the back 1.

Next, the operation of the first embodiment of the present invention will be described. As shown in FIG. 2, when the seat cushion 2 is moved to the lowest position by a vertical adjustment device (not shown), the vertical wall portion 2c of the housing portion 6 and the corner portion 1c of the seat back 1
And are in contact. When the seat cushion 2 is moved relative to the seat back 1 from this position to the uppermost position of the seat cushion 2 indicated by the broken line 20 by an up / down adjusting mechanism (not shown), the seat cushion 2 is moved to the vertical wall portion 2 of the accommodating portion 6.
c and the corner portion 1c of the seat back 1 are brought into sliding contact with each other to move. Then, when the seat cushion 2 moves to the uppermost position of the seat cushion indicated by the broken line 20, the bottom portion 2a of the accommodation portion 6 contacts the lower end portion 1a of the seat back 1. At this time, the vertical wall portion 2c of the accommodating portion 6 has the corner portion 1
It is in contact with c.

In this way, the lower end portion 1a of the seat back 1 is always positioned below the horizontal position of the seating surface rear end portion 2b of the seat cushion 2, and the seat cushion surface rear end portion 2 of the seat cushion 2 is positioned.
Since the front surface of the seat back 1 is located at b, it is possible to always prevent the occurrence of a gap. Therefore, the waist 3 of the occupant 3
The supportability of 0 can be improved, and the fatigue of the back and waist caused by sitting for a long time can be reduced. Further, since there is no gap between the seat back 1 and the seat cushion 2, the appearance of the seat from the front can be improved. Further, since the vertical wall portion 2c of the accommodation portion 6 provided in the seat cushion 2 and the corner portion 1c of the seat back 1 are in contact with each other regardless of the position of the seat cushion 2, the seat cushion rear end of the seat cushion 2 is Part 2b
Since there is no gap between the front surface 1b of the seat back 1 and the seat back 1, the appearance is improved.

Next, a second embodiment of the present invention will be described. FIG. 3 is a side view showing a state in which the occupant 3 is seated on the seat in the second embodiment of the present invention. The seat portion 6 is provided near the rear end portion of the seat cushion 2 and the rear end portion of the seat cushion 2 is left. The configuration is the same as that of the first embodiment of the present invention except that it is provided. Therefore, the reference numerals in FIG. 3 are the same as those in the first embodiment. The housing portion 6 is composed of a bottom portion 2a, a vertical wall portion 2c, and a rear wall portion 2d, and its shape is such that when the seat cushion 2 is at the uppermost position as indicated by a broken line 20, it is the lower end portion 1a of the seat back 1. It is shaped to fit.

Next, the operation of the second embodiment of the present invention will be described. FIG. 3 shows a state in which the seat cushion 2 is set to the lowermost position by a vertical adjusting device (not shown). Further, a broken line 20 shows a state in which the seat cushion 2 is set to the uppermost position by the vertical adjustment mechanism. First, when the seat cushion 2 is at the lowermost position, the vertical wall portion 2c of the accommodation portion 6 of the seat cushion 2 becomes the corner portion 1c of the seat back 1.
Is in contact with. The rear wall portion 2d and the rear of the lower end portion 1a of the seat back 1 may or may not be in contact with each other. When the seat cushion 2 is moved to the uppermost position, the seat cushion 2 moves while slidingly contacting the vertical wall portion 2c of the accommodation portion 6 and the corner portion 1c of the seat back 1. Then, when the seat cushion 2 is located at the uppermost position, the lower end portion 1 a of the seat back 1 and the bottom portion 2 of the accommodation portion 6
a is in contact with the rear wall portion 2d of the housing portion 6 and the seat back 1
The lower end 1a of the lower end 1a and the rear end 1d thereof contact. That is, the lower end portion 1a of the seat back 1 and the housing portion 6 are fitted together.

As described above, the lower end portion 1a of the seat back 1 is always located below the horizontal position of the rear end portion 2b of the seat cushion 2 and the rear end portion 2 of the seat cushion 2 is seated.
Since the front surface of the seat back 1 is located at b, it is possible to prevent the occurrence of a gap. Therefore, it is possible to improve the supportability of the waist portion 30 of the occupant 3, and it is possible to reduce the fatigue of the back and waist caused by sitting for a long time. Further, since there is no gap between the seat back 1 and the seat cushion 2, the appearance of the seat from the front and the rear can be improved. Further, the vertical wall portion 2c of the accommodation portion 6 provided in the seat cushion 2 and the seat back 1
Since the corner portion 1c of the seat cushion is in contact with the seat cushion 2 regardless of the position of the seat cushion 2, there is no gap between the rear end portion 2b of the seat cushion surface 2 and the front surface 1b of the seat back 1 so that the appearance is improved. To do.

In both the first embodiment and the second embodiment, the vertical wall portion 2c of the accommodation portion 6 provided in the seat cushion 2 and the corner portion 1c of the seat back are brought into contact with each other regardless of the position of the seat cushion 2. However, it does not matter if they are not in contact with each other.

[0013]

According to the vehicle seat structure of the present invention, even if the seat cushion is moved up and down, the front surface of the seat back is always positioned horizontally behind the rear end of the seating surface of the seat cushion, and the lower end portion of the seat back. By preventing the occurrence of a gap between the seat cushion and the seat cushion, the seat back always exists behind the waist of the seated person, and the supportability of the seated person's waist can be improved for a long time. It is possible to reduce back and waist fatigue caused by sitting.

[Brief description of drawings]

FIG. 1 is a rear perspective view including a partial cross section of a seat according to a first embodiment of the present invention.

FIG. 2 is a side view showing a state in which an occupant is seated on a seat according to the first embodiment of the present invention.

FIG. 3 is a side view showing a state in which an occupant is seated on a seat according to a second embodiment of the present invention.

FIG. 4 is a side view showing a state in which a person is seated on a general office chair.

FIG. 5A is a side view of a seat according to the related art. (B) A side view of a general seat.

[Explanation of symbols]

 1, 10, 12 ... seat back 1a ... lower end portion 1b ... front surface 1c ... corner portions 2, 11, 13 ... seat cushion 2a ... bottom portion 2b ... seating surface rear end Part 2c ・ ・ ・ Vertical wall part 6 ・ ・ ・ Storage part 30 ・ ・ ・ Waist part

Claims (1)

[Claims] 1. A vehicle seat comprising a seat back and a seat cushion, wherein the vertical position of the seat cushion with respect to the seat back can be adjusted by an up / down adjusting mechanism for the seat cushion. An accommodating portion having a depth for accommodating a lower end portion of the seat back is provided at a rear end portion of the seat cushion, and a vertical movement range of the seat cushion is set such that a rear end portion of a seating surface of the seat cushion is always the seat back. A vehicle seat structure characterized in that it is located in a front position.