JPH0549524A - Seat back construction - Google Patents

Abstract

PURPOSE:To obtain a seat back surface that fits the passenger's figure well and improve the comfort in sitting by a method wherein a bag is separated into left and right sides at the middle of a seat back and gas and particles filled in the bag move when the bag is pressed by the weight of a passenger. CONSTITUTION:Spaces between welds 23 and 25 inside a fitting mat 20 are separated into a number of chambers by a two or more separators 26, and spaces outside the welds 25 are separated into a number of chambers by separators 29. When the fitting mat 20 is pressed by the weight of a passenger, air 34 moves inside the chambers and between the second chamber B, the third chamber C,... and the Nth chamber N, and between the side first chamber X, the side second chamber Y and the side third chamber Z through through- holes 30, clearances 27 and through-hole 32. PE beads 36 can not pass the through-holes 30 as the PE beads have larger diameter than the through-holes 30, so that the PE beads 36 are retained between the front and back faces of the fitting mat 20. Therefore, the front face of the fitting mat 20 is prevented from contacting with the back face and is kept in a shape fitting the passenger's figure, and the comfort in sitting is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat back structure for a vehicle seat mounted on a vehicle such as an automobile.

[0002]

2. Description of the Related Art Conventionally, a vehicle seat mounted on a vehicle such as an automobile does not give a seated occupant a feeling of fatigue and can take a sitting posture according to the occupant's preference. A seat back is known, and an example thereof is Japanese Utility Model Laid-Open No. 63-130335.

As shown in FIG. 7, this seat back 7
0, the left and right end portions 70A of the seat back 70,
A right bag body 72 and a left bag body 74 are provided in 70B, and the right bag body 72 and the left bag body 74 are seat cushions 76.
Fluid passages 82 are connected to the central fluid accommodating member 80 attached to the central portion of the. The central fluid containing member 80 is configured to increase or decrease the amount of protrusion of the central portion of the seat surface 78 of the seat cushion 76 according to the amount of fluid contained. A flow direction control valve 84 is provided in the fluid passage 82 to selectively regulate the flow direction of the fluid to one side on one side in response to a switching command.

Therefore, in the seat back 70, the center portion of the seat surface 78 of the seat cushion 76 is lowered by utilizing the weight of the seated occupant, and the left and right side end portions 70A and 70B of the seat back 70 are projected. Thus, the gap between the body of the occupant and the seat back 70 can be reduced, and in particular, since the body of the occupant can be supported from the side, it is possible to prevent the displacement of the occupant from rolling.

[0005]

However, in the seat back 70, the flow direction regulating valve 84 and a changeover switch for outputting a changeover command to the flow direction regulating valve 84 are required, so that the apparatus becomes complicated. There is a problem that the size increases and the weight increases.

In view of the above facts, an object of the present invention is to obtain a seat back structure which can obtain a seating surface conforming to the body shape of an occupant with a simple structure.

[0007]

According to a first aspect of the present invention, there is provided a mat member having a bag body which is provided between a seat cover and a main pad and is divided into left and right portions at a substantially central portion of a seat back, and It is characterized in that it has a gas filled in the bag and a granular material mixed in these gases.

[0008]

According to the first aspect of the present invention, when the occupant sits on the seat and the back portion abuts on the seat back, the bag body divided into the left and right portions at the substantially central portion of the seat back by the weight of the occupant. The left and right are pressed respectively, and the gas and the granular material move inside the bag. As a result, the mat member has an uneven shape that conforms to the body shape of the occupant. Therefore, it is possible to obtain a seat surface that fits the occupant's body shape with a simple structure. Further, since the mat member is divided into the left and right portions at the substantially central portion of the seat back, the gas flow is independent on the left and right sides. Therefore, when one of the left and right sides of the seat back is pressed, the other one can be prevented from bulging and the seating surface can be prevented from swinging.

Further, at a portion where the pressing force is relatively high near the waist of the occupant, a granular material is interposed between the front surface (side surface of the occupant) and the rear surface of the mat member so that the front surface and the rear surface of the mat member contact each other. It is possible to prevent contact with each other, and to hold the support of the lower back in conformity with the body shape, thus improving the sitting comfort.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a seat back structure according to the present invention will be described with reference to FIGS.

As shown in FIG. 2, the seat back 12 of the vehicle seat 10 to which the seat back structure of the present embodiment is applied has a shape in which the width direction outer side portion 12A of the seat back 12 projects forward from the central portion 12B. It is said that. Also,
A seat cover 14 is arranged on the surface of the seat back 12, and the seat cover 14 is quilted with a skin 16 forming an outer portion and a carver pad 18 forming an inner portion.

Rear side of the carver pad 18 (right side of FIG. 2)
A fitting mat 20 as a mat member is arranged on the rear side of the fitting mat 20, and a main pad 22 is arranged on the rear side of the fitting mat 20. That is, the fitting mat 20 is sandwiched between the seat cover 14 and the main pad 22.

The fitting mat 20 is a fitting mat front 20 made of a soft resin film.
A and the fitting mat rear 20B are welded at the outer peripheral portion to form a thin bag.

As shown in FIG. 1, a separator 21 made of a soft resin film is provided in the upper part of the central portion of the fitting mat 20 in the seat back width direction, as shown in FIG. As described above, the lower portion 21A of the separator 21 is connected to the welded portion 23 of the fitting mat front 20A and the fitting mat rear 20B formed along the vertical direction. Therefore, as shown in FIG. 1, the inside of the fitting mat 20 is largely divided into two parts by the separator 21 and the welded part 23.

As shown in FIG. 3, the fitting mat front 20A is located on the boundary line between the widthwise outer side portion 12A of the seatback 12 of the fitting mat 20 and the widthwise central portion 12B of the seatback 12.
A welding portion 25 between the fitting mat rear 20B and the fitting mat rear 20B is formed. As shown in FIG. 1, these welded portions 2
The upper end portion 25A of 5 reaches the upper end portion of the side wall portion of the fitting mat 20, and the lower end portion 25B is arranged at the bottom portion of the fitting mat 20 with a gap 27.

The welded portion 23 in the fitting mat 20
A plurality of separators 26 made of a soft resin film extending in the width direction of the sea bag are arranged between the welding portion 25 and the welding portion 25.

As shown in FIG. 4, the front end 26A of the separator 26 is adhered to the fitting mat front 20A, and the rear end 26B of the separator 26 is adhered to the fitting mat rear 20B. Therefore,
As shown in FIG. 1, the portion between the welded portion 23 and the welded portion 25 in the fitting mat 20 is formed by a plurality of separators 26 in order from the first chamber A, the second chamber B, the third chamber C. ..It is divided into Nth room N. Also,
The second chamber B, the third chamber C, ... The Nth chamber N are connected to each other by a through hole 30 formed at an end portion of the separator 26 in the width direction, and the first chamber A is fitted to a substantially central portion thereof. Mat front 20A and fitting mat rear 2
A welded portion 31 with 0B is formed.

The welded portion 25 in the fitting mat 20
The outer side portion is composed of a plurality of separators 29 made of a soft resin film extending in the width direction of the sea bag, and is formed by a side first chamber X, a side second chamber Y, and a side third chamber in order from above. It is divided into Z. The side first chamber X, the second side chamber Y, and the third side chamber Z are respectively separated by a separator 29.
Are connected to each other by a through hole 32 formed in the central portion in the width direction, and the side third chamber Z is connected to the Nth chamber N by a gap 27.

First chamber A, second chamber B, third chamber C ... Nth chamber
The chamber N, the side first chamber X, the side second chamber Y, and the side third chamber Z are filled with air 34 as a gas, and the second chamber B, the third chamber C ... In the N chamber N, for example, spherical PE beads 36 as particles are mixed together with the air 34. The amount of the PE beads 36 filled in each chamber is adjusted so that the shape of the fitting mat 20 when the occupant is seated forms a seat surface that fits the occupant's body shape.

Further, the first chamber A, the second chamber B, the third chamber C ...
-Nth chamber N and side first chamber X, side second chamber Y, side third
The total amount of the air 34 injected into the chamber Z is 100% or less of the volume of the entire fitting mat 20. Therefore, the air 34 can move in each room and between the rooms. In addition, the diameter of the through hole 30 is smaller than the outer diameter of the PE bead 36, the PE bead 36 cannot pass through the through hole 30, and the second chamber B, the third chamber C ... Nth.
It is designed to move in the room N.

As shown in FIG. 5, the separator 21 is
The front portion has a shape recessed rearward in a circular arc shape, and has a shape that easily supports the upper back of the occupant.

Next, the operation of this embodiment will be described.
In this embodiment having the above configuration, the occupant sits on the seat 10,
When the back of the occupant abuts on the seat back 12, the fitting mat 20 divided into right and left is pressed at the approximate center of the seat back 12 by the weight of the occupant. Thereby, the left and right of the fitting mat 20 are independent, and the first chamber A, the second chamber B, the third chamber C ... The Nth chamber N and the side first chamber X, the side second chamber Y, The air 34 in the side third chamber Z moves in each chamber, and the air 34 passes through the through holes 3
0, the gap 27, and the through hole 32, the second chamber B, the third chamber C ... The Nth chamber N and the side first chamber X, the side second chamber Y as indicated by the arrows in FIG. , Between the side third chambers Z.
Further, in the first chamber A, the front portion of the separator 21 has a shape recessed rearward in an arc shape, and reliably supports the upper back of the occupant.

Therefore, the fitting mat front 2
0A becomes an uneven shape that fits the occupant's body shape. Further, the diameter of the through hole 30 is smaller than the outer diameter of the PE bead 36, and the PE bead 36 cannot pass through the through hole 30. Therefore, in the second chamber B, the third chamber C, ... The Nth chamber N, even when the pressing force by the occupant is high, the front surface of the fitting mat 20 (the fitting mat front 20A) and the rear surface (the fitting mat rear 20B). )
The PE beads 36 are interposed between the front and rear surfaces of the fitting mat 20 to prevent contact with each other, and the waist support can be held in conformity with the body shape, and the sitting comfort can be improved. .. In addition, the PE beads 36 allow the fitting mat 20 to quickly react to the front-back, left-right, and left-right shaking of the occupant, so that the front-back, left-right, and left-side shaking of the passenger can be prevented.

As described above, in the present embodiment, it is possible to obtain a seating surface that fits the occupant's body shape with a simple structure for occupants having different physiques. Further, in this embodiment, since the fitting mat 20 is divided into the left and right at the widthwise central portion of the seat back, the flow of the air 34 is independent on the left and right.
Therefore, when one of the right and left seating surfaces of the seat back 12 is pressed, the other can be prevented from bulging and the seating surface can be prevented from swinging.

Further, in this embodiment, since the body pressure surface is expanded, a high pressure is not partially applied to the occupant, and numbness or the like does not occur even when sitting for a long time.
Also, the second chamber B and the third chamber C of the fitting mat 20
... The N-th chamber N and the side first chamber X, the side second chamber Y, and the side third chamber Z have a small diameter through hole 30, a gap 27, and a through hole 32.
Since the air 34 does not instantly move between the chambers, the holdability for the lateral G during cornering is secured.

Although air 30 is used in this embodiment, the gas is not limited to air 30. Further, in the present embodiment, the fitting mat 20 is divided into the chambers by the separators 26 and 29, but the fitting mat 20 is composed of a plurality of bags, and the plurality of bags are connected by a pipe having a small diameter or the like. Good as a structure.

Further, in this embodiment, the diameter of the through hole 30 is set to P
The outer diameter of the E bead 36 is made smaller so that the PE bead 36 cannot pass through the through hole 30, but instead of this, a net or the like is provided in the through hole 30 so that the PE bead 36 can pass through the through hole 30. You may not be allowed.

Further, as shown in FIG. 6, an air damper 40 communicating with the Nth chamber N of the fitting mat 20 may be provided. In this case, in the air damper 40, when the set pressure becomes equal to or higher than a predetermined value, the bellows portion 40A expands so that the damper effect is obtained. Therefore, the air damper 4
0 does not operate with the pressure of the seating load, but operates when a larger load, for example, G at the time of starting or G at the time of getting on the occupant occurs, and absorbs a sudden pressure change in the fitting mat 20. The air damper 40 is also effective in preventing the fitting mat 20 from shaking.

[0029]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned structure, it has an excellent effect that a seating surface conforming to the body shape of an occupant can be obtained with a simple structure.

[Brief description of drawings]

FIG. 1 is a sectional view showing a vehicle seat to which a seat back structure according to an embodiment of the present invention is applied.

2 is a sectional view taken along line 2-2 of FIG.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a side sectional view showing a fitting mat of a seat back structure according to an embodiment of the present invention.

5 is a sectional view taken along line 5-5 of FIG.

FIG. 6 is a sectional view showing a vehicle seat to which a seat back structure according to another embodiment of the present invention is applied.

FIG. 7 is a perspective view showing a seat back structure of a conventional example as seen from diagonally front.

[Explanation of symbols]

 10 Vehicle Seat 12 Seat Back 14 Seat Cover 20 Fitting Mat (Mat Material) 21 Separator 22 Main Pad 23 Welding Part 34 Air (Gas) 36 PE Beads (Granular Body)

Claims (1)

[Claims] 1. A mat member having a bag body which is provided between a seat cover and a main pad and is divided into left and right parts at a substantially central portion of a seat back, and a gas filled in the bag body.
A seat back structure comprising: a granular material mixed in these gases.