JP7157016B2 - vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat. More specifically, it relates to a vehicle seat provided with a cushion body in which a plurality of inner bag bodies are arranged at predetermined positions inside an outer bag body.

2. Description of the Related Art Seats mounted in vehicles such as automobiles (vehicle seats) are required to be comfortable to sit on for long periods of time. For example, the structure of a seat that supports the lower body of a seated person in a seated state is one of the main research subjects.

A typical vehicle seat includes, for example, a seat body having cushioning properties and a seat cover that covers the seat body in a seating portion. Above all, the seat body is the body on which the seated person actually sits, and is the main body that supports the lower half of the body (that is, the buttocks and thighs) of the seated person. For example, Patent Literatures 1 and 2 disclose techniques related to the structure of a seat body and a cushion body that can be used together therewith.
Specifically, for example, the seat surface support (seat body) of Patent Document 1 has a seat surface body (cushion body) filled with granular materials. Further, the seat body of Patent Document 1 and the pad main body of Patent Document 2 are designed to be capable of supplying air.

JP-A-10-229930 Japanese Unexamined Patent Application Publication No. 2013-23140

By the way, when a seated person is seated, the seated load of the seated person is likely to be applied to the parts of the seat that receive the ischial tuberosities, coccyx, and thighs of the seated person. In addition, at such sites, the occupant feels discomfort such as pain, pressure, and fatigue, and it is known that the type and degree of such discomfort differ depending on the sites as described above. ing. For example, in the vehicle seat disclosed in Japanese Patent Laid-Open No. 2002-200001, the grains move when the weight of the seated person is applied, and the seat surface body deforms into a shape that conforms to the body shape of the seated person. It is described that this allows the body pressure of the seated person to be evenly distributed.
However, it cannot be said that the cushion member having the structure disclosed in Patent Document 1 provides an optimum seating environment for each of the ischial tuberosity, tailbone, and thigh of the seated person. Therefore, it is difficult to eliminate the discomfort depending on the part, and there is still room for improvement in this respect.

Further, in the vehicle seats disclosed in Patent Documents 1 and 2, polyurethane foam is used as the material of the seat body (pad). Polyurethane foam is excellent in cushioning properties, durability, shock absorption, and the like, and is light in weight, so it is a material that is generally and preferably employed as a material that realizes comfortable sitting comfort.
However, the polyurethane foam used as the material for the seat body is often thermosetting and difficult to reprocess. In addition, it is difficult to reduce the molecular weight of polyurethane foam to raw materials and the like. Therefore, it must be said that the conventional vehicle seats disclosed in the above patent documents have low recyclability.

Therefore, the present invention was created to solve the above problems, and even when a person sits on a seat for a long time, the discomfort caused by sitting for a long time is improved by improving body pressure dispersion. To provide a vehicular seat which alleviates pleasant feeling and is more comfortable to sit on than before. Another object of the present invention is to provide a vehicle seat provided with a seat cushion that significantly improves recyclability by reducing the use of conventional flexible polyurethane foam.

The inventor of the present invention arranges a bag housing a bead material at a position for receiving a pair of right and left ischial tuberosities of the buttocks of the seated person, coccyx of the buttocks, and thighs. In addition, the present inventors have found that the comfort of sitting on the vehicle seat can be remarkably improved by making the configuration of these bags predetermined.
That is, in order to achieve this object, the vehicle seat disclosed herein includes a seat body that supports the buttocks and thighs of a seated person, and a seat cover that covers at least the upper surface of the seat body.
A cushion body is attached to the seat body below the seat cover. The cushion body includes an outer bag body and a plurality of inner bag bodies arranged at predetermined positions inside the outer bag body, and the bead material is accommodated in the bag body in a flowable state. and a plurality of inner bags. Each of the plurality of inner bag bodies allows air to flow out and in in the interior of the outer bag body.
Here, as the above inner bag body:
(1) A pair of left and right first inner bag bodies arranged at positions for respectively receiving a pair of left and right ischial tuberosities of the buttocks of a seated person in a seated state;
(2) a second inner bag positioned to receive the coccyx of the buttocks of the seated person in the sitting state; and
(3) a third inner bag positioned to receive the thighs of the seated person in the seated state;
characterized by having at least

In the vehicle seat having such a configuration, a plurality of inner bag bodies containing bead material in a flowable state are accommodated inside the outer bag body of the cushion body arranged below the seat cover. In addition, the plurality of inner bag bodies are arranged at positions for receiving a pair of right and left ischial tuberosities of the buttocks of the seated person in the sitting state, the coccyx of the buttocks, and the thighs. As a result, it is possible to provide each of these parts with an optimum sitting environment for alleviating the discomfort caused by sitting, thereby improving body pressure dispersion.

In a preferred aspect, the reaction force generated in the second inner bag body according to the seating load of the occupant is greater than the reaction force generated against the first inner bag body according to the seating load of the occupant. designed to be small. As a result, it is possible to improve the comfort when sitting on the vehicle seat.
Further, in a preferred aspect, the above-mentioned relative to the volume of each of the pair of left and right first inner bag bodies (meaning the volume in a natural state where no external force is applied, such as when compressed or expanded; the same shall apply hereinafter). The filling rate of the bead material is set higher than the filling rate of the bead material with respect to the volume of the second inner bag. With such a configuration, the reaction force (repulsive force) in each inner bag body can be realized in a suitable state.
In a preferred aspect, the bead material is at least one resin selected from the group consisting of polyethylene, polypropylene, thermoplastic polyurethane (TPU: also referred to as thermoplastic polyurethane elastomer), and thermoplastic elastomer (TPE). is made. By adopting the resin bead member having such a configuration, it is possible to further improve the comfort of the vehicle seat when the passenger is seated.

In another preferable aspect, each of the plurality of inner bag bodies has air permeability and is made of an elastomer. According to the inner bag body having such a configuration, the outflow of air from the inside of the inner bag body to the outside in response to the application of the load and the inflow of air from the outside to the inside of the inner bag body in response to the release of the load are reversible. And it can be done smoothly.
In another preferable aspect, when the reference weight is 70 kg, the air outflow rate from the inside of the outer bag body to the outside when the seated person of the reference weight is seated is set to 30 ml/sec or less. In addition, the rate of volume reduction per second of the outer bag due to the outflow of air (outflow of air per second/total volume of the outer bag) is set to 10% or less.
According to such a configuration, when the seated person is seated, the cushion body (that is, the inner bag body and the outer bag body) deforms appropriately and timely according to the seated person's weight and the shape of the buttocks and thighs. be able to.

In another preferred aspect, the thickness of the outer bag body is formed to be thicker than any one of the plurality of inner bag bodies.
With such a configuration, the air flows in and out of the plurality of inner bag bodies inside the outer bag body in a suitable state. Moreover, it is possible to prevent the outer bag from being distorted.

In another preferred aspect, a bead material is accommodated in a flowable state inside the outer bag and outside the plurality of inner bags.
With such a configuration, the gap between the inner bag bodies can be filled inside the outer bag body. As a result, the arrangement of the plurality of inner bag bodies can be stabilized, and the buttocks and thighs of the seated person can be appropriately supported.

1 is a perspective view schematically showing the entire vehicle seat according to one embodiment; FIG. FIG. 2 is a perspective view schematically showing a configuration of a seating portion of the vehicle seat shown in FIG. 1; FIG. 2 is a cross-sectional view schematically showing the configuration of a seating portion and a pedestal of the vehicle seat shown in FIG. 1; FIG. 2 is a perspective view schematically showing the configuration of a cushion body of the vehicle seat shown in FIG. 1; 5 is a schematic cross-sectional view schematically showing a state in which a seating load of a seated person in a seated state is applied to the cushion body shown in FIG. 4; FIG.

Preferred embodiments of the vehicle seat disclosed herein will be described below with appropriate reference to the drawings. Note that the dimensional relationships (length, width, thickness, etc.) in each drawing do not reflect the actual dimensional relationships. Matters other than those specifically mentioned in this specification, which are necessary for carrying out the present invention, can be grasped as design matters by those skilled in the art based on the prior art in the field. In the drawings (specifically, FIGS. 2 to 5), the directions of up, down, left, right, front, and rear are indicated by arrows U, D, L, R, F, and Rr, respectively. ing.

<Overall Configuration of Vehicle Seat>
First, the overall configuration of the vehicle seat disclosed herein will be described with reference to FIG. FIG. 1 is a perspective view schematically showing the entire vehicle seat according to one embodiment.
A vehicle seat 1000 disclosed herein includes a seat portion 100 on which a seated person sits, a back support portion 200 that serves as the backrest of the seated person, a headrest 300 that supports the seated person's head from behind, and a base 400. Prepare. As shown, the seat 100 is attached to a pedestal 400 .

<Structure of Seat>
Next, the configuration of the seat portion 100 will be described in detail with reference to FIGS. 2 and 3. FIG. FIG. 2 is a perspective view schematically showing a configuration of a seating portion of the vehicle seat shown in FIG. 1. FIG. 3 is a cross-sectional view schematically showing the configuration of the seating portion and the pedestal of the vehicle seat shown in FIG. 1. As shown in FIG.
As illustrated, the seat portion 100 includes a frame-shaped seat frame 40 that serves as a skeleton of the seat portion 100, a seat body 30 that supports the buttocks and thighs of the seated person, and at least an upper surface of the seat body 30. A seat cover 10 is provided. A cushion body 20 is attached to the seat body 30 below the seat cover 10 . The seat cover 10 , the cushion body 20 and the seat body 30 are attached to the seat frame 40 and attached to the pedestal 400 . At this time, the seat frame 40 is attached inside the pedestal 400 .
A vent hole 420 is provided in the base 400 . The vent 420 is connected to the vent 282 of the outer bag 28 of the cushion body 20 .

<Seat frame>
As the seat frame 40, a seat frame that is generally used for this type of vehicle seat can be used without particular limitation. Typically, for example, the seat frame 40 has a frame shape (specifically, for example, a substantially rectangular shape) as shown in FIG. It has a top plate portion 48 surrounded by a wall portion 42 and a front wall portion 44 and a rear wall portion 46 which are positioned in front and rear of the seat frame 40 and extend in the left-right direction. The top plate portion 48 is a receiving surface that receives the lower surface of the seat body 30 . The material of the seat frame 40 is not particularly limited, but is, for example, a rigid material (eg, resin, wood, ceramics, metal, etc.).

<Seat cover>
The seat cover 10 is made up of, for example, an upholstery 12 and a soft layer 14 .
[Epidermis]
As the skin 12, a skin that is generally used for this type of vehicle seat can be used without particular limitation. Typically, skins made of materials having good tear strength, abrasion strength, flexibility, and texture are preferred, for example, cellulose fibers such as cotton and linen, protein fibers such as wool and silk, rayon and cupra. Semi-synthetic fibers such as regenerated fibers, acetate, triacetate and Promix, and fabrics made from synthetic fibers such as polyamide, polyester, acrylic, vinylon, polyurethane, polyvinylidene, polyethylene and polypropylene. Also, the skin 12 preferably has good air permeability.
[Flexible layer]
The soft layer 14 deforms against the load of the seated person, that is, it preferably has good cushioning properties and can transmit the load to the cushion body 20, and is made of, for example, soft polyurethane foam. The thickness is preferably about 2-15 mm (more preferably about 5-10 mm).

<Seat body>
For example, the seat body 30 is sandwiched between the two hanging grooves 32 extending in the front-rear direction and the rear wall portion 34 extending in the left-right direction, with the two hanging grooves 32 extending in the front-rear direction and the rear wall portion 34 extending in the left-right direction as boundaries. It has a top plate portion 38 that is attached to the top plate portion 38 and side support portions 36 that are positioned on both left and right sides.
Although detailed illustration is omitted, the hanging groove 32 is a groove recessed downward from the top plate portion 38 . A portion of the seat cover 10 positioned above (opposed to) the hanging groove 32 is pulled into the hanging groove 32 and fixed. Since the method of fixing the seat cover 10 via the hanging groove 32 is conventionally known, detailed description thereof will be omitted.
The top plate portion 38 is a receiving surface for the cushion body 20, and receives the buttocks and thighs of the seated person.
As illustrated, the side support portions 36 are formed so as to swell upward from the top plate portion 36 like a bank. The side support portions 36 support the load of the seat occupant acting in the seat width direction (horizontal direction in the figure), for example, when the vehicle turns.
The thickness of the sheet body 30 is preferably about 20-50 mm.

[Material]
Various thermoplastic elastomers (TPE: for example, polyolefin, polystyrene, polyester, vinyl, etc.) can be preferably used as the sheet body 30 . Among these, for example, a polyolefin thermoplastic elastomer (TPO) in which the hard segment is an olefin resin is particularly preferred. Further, a thermoplastic elastomer mainly composed of polypropylene (PP) containing a rubber component such as EPM or EPDM can be preferably used as the soft segment. Alternatively, from the viewpoint of good cushioning properties, for example, a foamable polyolefin resin material can be used favorably. Preferred examples include expanded polypropylene (EPP), expanded polybutylene (EPB), and the like.

<Cushion body>
Next, the configuration of the cushion body 20 will be described in detail with reference to FIGS. 2, 3 and 4. FIG. FIG. 4 is a perspective view schematically showing the configuration of the cushion body of the vehicle seat shown in FIG. 1. FIG.
As shown, the cushion body 20 comprises an outer bag 28 and a plurality of inner bags (indicated by reference numerals 22, 24 and 26 in the figure) arranged at predetermined positions inside the outer bag 28. ) and

[Outer bag]
-Structure and Ventilation Mechanism-
The outer bag body 28 is provided with a vent 282 to allow the outflow of air to the outside and the inflow of air from the outside. Specifically, for example, the vent 282 is provided with an air flow control valve (not shown) having fine holes.
For example, when a seated person sits on the seat portion 100, a seating load acts on the outer bag body 28 (that is, the cushion body 20). At this time, the bead material (the bead material 281 described later and the bead material accommodated inside the plurality of inner bag bodies) inside the outer bag body 28 is compressed, deformed, and moved by the seating load. Air flows from the inside of the outer bag body 28 to the outside through the holes due to the compressive deformation and movement of the bead material. When the air flow control valve is closed to shut off the inflow and outflow of air, the shape of the cushion body 20 can be maintained in a state where the outer bag body 28 stores the shape of the seated posture.
On the other hand, when the air flow control valve is opened, air flows into the outer bag 28, and the inflow of air into the outer bag 28 is affected by the restoring force of the bead material. Specifically, when the occupant stops sitting on the seat portion 100, the bead material is released from the action of the seating load. At this time, the bead material tries to return to the shape before the seating load acts, so a restoring force is generated. When such a restoring force is generated, the inside of the outer bag body 28 becomes negative pressure. As a result, air flows from the outside to the inside of the outer bag body 28 through the holes.
The fine holes are limited to a specific shape and number as long as they can achieve the air outflow speed and volume reduction rate described later in the outer bag 28 and prevent the bead material from spilling out. not. Moreover, the method for forming the holes is not particularly limited, but examples thereof include a method using a sewing needle, a laser, or the like.

- Air outflow velocity and volume reduction rate -
Here, when the reference weight of the seated person is 70 kg, it is preferable that the air outflow rate from the inside of the outer bag body to the outside when the seated person of the reference weight is seated is set to 30 ml/sec or less. . In addition, it is preferable that the rate of decrease in the volume of the outer bag per second due to the outflow of air (outflow of air per second/total volume of the outer bag) is set to 10% or less. Such air outflow speed and volume reduction rate are set to suitable conditions by the configuration of the air flow control valve provided in the outer bag 28, the configuration of the bead material (material, filling rate, etc.) described later, and the like. Thereby, the cushion body 20 can be deformed according to the shape of the seated person's buttocks and thighs, and can memorize the shape.

-Constituent materials-
The outer bag 28 is preferably made of a flexible material to receive the buttocks and thighs of the occupant. In addition, it is preferable that the outer bag body 28 is configured such that it is difficult or impossible for air to flow into and out of the interior and exterior of the outer bag body 28 except through the air vents 282 . As the constituent material, for example, a thermoplastic polyurethane (TPU) film can be preferably used. The thickness of the outer bag 28 (that is, the thickness of the film) is preferably 50 to 150 μm (preferably about 100 μm, for example).

－Bead material－
If necessary, the bead material 281 can be contained in a fluid state inside the outer bag 28 and outside the plurality of inner bags. In such a case, it is preferable that the bead material 281 basically does not participate in the deformation of the inner bag, and a bead material that is softer than the bead material used for the inner bag 22 can be arranged by adjusting the material or density. preferable.
The bead material 281 is preferably made of at least one resin selected from polyethylene, polypropylene, thermoplastic polyurethane (TPU), and thermoplastic elastomer (TPE). Examples of such bead materials include polyethylene with a bulk density of 15 to 30 g/L and TPU with a bulk density of 20 to 50 g/L. Furthermore, the bead material 281 is preferably a substantially spherical foam with a diameter of 1 to 10 mm. The bead material 281 is preferably made of a material different from the bead material accommodated inside the plurality of inner bag bodies, which will be described later.
The filling rate of the bead material 281 inside the outer bag 28 is 50 to 120% (preferably 70 to 90%) of the volume of the outer bag 28 excluding the volumes of the plurality of inner bags. ) is preferred. For example, even when a plurality of inner bag bodies having a size that creates a gap is arranged inside the outer bag body 28, the filling rate of 50% or more allows the shape of the cushion body 20 to be reduced. distortion can be prevented.
From the viewpoint of being able to adjust the amount of air flow with precision, it is preferable that the bead material 281 is not included inside the outer bag 28 and outside the plurality of inner bags.

-Thickness-
The thickness of the outer bag body 28 is preferably 50 mm or less (preferably 10 to 50 mm) when a plurality of inner bag bodies are not arranged inside the outer bag body 28 . When the thickness is 10 mm or more, the bead material 281 can be appropriately overlapped inside the outer bag body 28 . Moreover, since the thickness is 50 mm or less, even if the cushion body 20 is deformed by, for example, a person sitting on the seat, the deformed shape can easily be restored to its original shape.
In addition, the thickness of the outer bag 28 is formed to be thicker than any of the plurality of inner bags. As a result, in the interior of the outer bag 28, air flows out from the inside of the plurality of inner bags to the outside and air flows in from the outside to the inside in a suitable state. In addition, the arrangement of the inner bag can prevent the outer bag 28 (that is, the cushion body 20) from being distorted.

[Inner bag]
As a plurality of inner bag bodies,
(1) A pair of left and right first inner bag bodies 22 arranged at positions for respectively receiving a pair of left and right ischial tuberosities of the buttocks of a seated person in a seated state;
(2) a second inner bag 24 positioned to receive the coccyx of the buttocks of the seated person; and
(3) a third inner bag 26 positioned to receive the thighs of the seated person;
are accommodated in the outer bag body 28 . Hereinafter, when no particular distinction is made, it is simply referred to as an "inner bag".
As shown, bead material 221, 241, 261 is accommodated inside each of the inner bag bodies 22, 24, 26. As shown in FIG.
Each of the inner bag bodies preferably has air permeability and is made of an elastomer. For example, thermoplastic polyurethane (thermoplastic polyurethane elastomer: TPU) can be preferably used as the elastomer. In addition, air permeability is realized by making holes in the inner bag with a sewing needle or the like to such an extent that the bead material does not leak out of the inner bag. The shape and number of the holes are not particularly limited as long as they are set so as to achieve the air outflow rate and volume reduction rate from the outer bag body 28 described above. With such a structure, the inner bag body can be easily deformed according to the weight of the seated person and the shape of the buttocks and thighs.

-Interaction when sitting-
Here, FIG. 5 shows the interaction between the buttocks of the seated person and the cushion body when the seated person sits on the vehicle seat disclosed herein and the seating load acts on the seating portion of the vehicle seat. will be used to explain. 5 is a schematic cross-sectional view schematically showing a state in which the seat load of a seated person in a seated state is applied to the cushion body shown in FIG. 4. FIG. It should be noted that FIG. 5 shows only the main part for explaining the interaction of the cushion body.
When the seated person sits on the seat portion, as shown in the figure, the seating load of the seated person acts on the cushion body that receives the buttocks H of the seated person. Specifically, for example, a downward seating load W1 acts on each of the pair of left and right first inner bag bodies 22 that receive the pair of left and right ischial tuberosities T1 of the buttocks H of the seated person. A downward seating load W2 acts on the second inner bag body 24 that receives the coccyx T2 of the buttocks H of the seated person. Here, the first inner bag body 22 and the second inner bag body 24 bend and deform downward according to the shape of the buttocks H according to the seating loads W1 and W2. With this deformation, an upward reaction force F1 is generated in each of the pair of left and right first inner bag bodies 22 and an upward reaction force F2 is generated in the second inner bag body 24 .

The seating load of the seated person is supported by the reaction forces F1 and F2, and comfortable sitting comfort can be achieved by appropriately adjusting the magnitudes of the reaction forces F1 and F2. Specifically, for example, the reaction force F2 generated in the second inner bag body 24 in accordance with the seating load W2 of the seated person is generated in the first inner bag body 22 in response to the seating load W1 of the seated person. It is preferable to be configured so as to be smaller than the reaction force F1.
By adjusting the reaction force F1 to be larger than the reaction force F2, the supportability of the pair of left and right ischial tuberosities T1 can be enhanced. Further, by adjusting the reaction force F2 to be smaller than the reaction force F1, the body pressure felt by the seated person near the ischial bone T2 is reduced, and the uncomfortable feeling caused by sitting is reduced.

-First and second inner bags-
For example, by adjusting the type of bead material contained in the first inner bag body 22 and the second inner bag body 24, the filling rate of the bead material, the thickness of the inner bag body, and the like, the reaction force described above can be adjusted. A balance of F1 and F2 can be achieved. A specific example thereof will be described below.
- Material of bead material The bead material is preferably made of at least one resin selected from polyethylene, polypropylene, TPU, and TPE.
For example, the first inner bag 22 preferably contains polyethylene with a bulk density of 30 to 40 g/L (more preferably about 36 g/L). Further, it is preferable that the second inner bag body 24 contains TPU having a bulk density of 55 to 65 g/L (more preferably about 62 g/L). Polyethylene and TPU are preferred due to their high compression recovery.

Filling rate of bead material The filling rate of the bead material inside the first inner bag 22 and the second inner bag 24 is, for example, 90 to 120% of the volume of each inner bag.
Specifically, for example, the filling rate of the bead material 221 in the first inner bag 22 is preferably 105 to 115% (more preferably about 110%). Moreover, the filling rate of the bead material 241 in the second inner bag 24 is preferably 95 to 105% (more preferably about 100%). In this manner, the filling rate of the bead material 221 with respect to the bag volume of each of the pair of left and right first inner bag bodies 22 is higher than the filling rate of the bead material 241 with respect to the bag body volume of the second inner bag body 24. A high setting is preferred. This makes it possible to adjust the magnitudes of the reaction forces F1 and F2 generated according to the seating loads W1 and W2 of the seat occupant on the respective inner bag bodies under suitable conditions.

・Thickness of the first and second inner bag bodies The thickness of the first inner bag body 22 and the second inner bag body 24 is about 30 to 50 mm (for example, about 40 mm) when the bead material is not contained. It is preferably thinner than the thickness of the outer bag.

-Third inner bag (see FIG. 3)-
Next, the third inner bag that supports the thighs of the seated person will be described.
The bead material 261 accommodated in the third inner bag 26 is preferably made of at least one resin selected from among polyethylene, polypropylene, TPU, and TPE, and has a bulk density of 30 to 40 g/L (more than preferably about 36 g/L) polyethylene. Moreover, the filling rate of the bead material 261 in the third inner bag 26 is preferably 50 to 70% (more preferably about 60%).
Also, the thickness of the third inner bag body 26 is preferably about 20 mm. That is, the thickness is preferably thinner than the thicknesses of the first inner bag body 22 and the second inner bag body 24 . This facilitates the flow of the bead material 261 inside the third inner bag body 26 according to the shape and movement of the thighs of the seated person.

<Construction of vehicle seats>
Next, an example of the construction process of the vehicle seat disclosed herein will be described (see FIGS. 1, 2 and 3).
For example, first, the backrest 200 with the headrest 300 attached is attached to the base 400 . Next, the frame 40 is attached to the pedestal 400 . Next, the seat body 30 is arranged on the frame 40 so that the top plate portion 48 receives the lower surface of the seat body 30 . Next, the cushion body 20 is placed on the seat body 30 so that the top plate portion 38 receives the lower surface of the cushion body 20 . At this time, the vent 282 in the cushion body 20 and the vent 420 in the base 400 are connected. Then, the seat cover 10 is arranged so as to cover at least the upper surfaces of the cushion body 20 and the seat body 30 . Thus, the vehicle seat 1000 disclosed here is constructed.

<Action and effect 1: Concerning comfort when seated>
As described above, in the vehicle seat disclosed herein, the seat body includes the cushion body below the seat cover. Further, the cushion body includes an outer bag and a plurality of inner bags arranged at predetermined positions inside the outer bag. Both the outer bag and the inner bag have a predetermined configuration in which the bead material is contained in a fluid state. That is, the vehicle seat disclosed herein supports the buttocks (a pair of right and left ischial tuberosities and the coccyx) and the thighs of the occupant in a seated state in a suitable state, thereby dispersing the body pressure. is improved. This realizes comfortable sitting comfort for the seated person.

<Effect 2: Reduction of environmental load>
In addition, the vehicle seat disclosed herein employs recyclable thermoplastic elastomer (TPU), thermoplastic resin (polypropylene), etc., instead of polyurethane foam conventionally used as the seat body. By improving the recyclability of the seat body in this way, the environmental load is reduced.

<Effect 3: Weight reduction>
Furthermore, the vehicle seat disclosed herein can be made lighter by adopting a thermoplastic elastomer as the seat body and arranging a predetermined cushion body thereabove. Specifically, for example, the vehicle seat can be about 10 to 40% lighter than a conventional vehicle seat in which polyurethane foam is used as the seat body.

Although one embodiment of the vehicle seat disclosed herein has been described above in detail, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

10 seat cover 12 skin 14 flexible layer 20 cushion body 22 first inner bag 221 bead material 24 second inner bag 241 bead material 26 third inner bag 261 bead material 28 outer bag 281 bead material 282 ventilation Port 30 Seat body 32 Hanging groove 34 Rear wall 36 Side support 38 Top plate 40 Seat frame 42 Side wall 44 Front wall 46 Rear wall 48 Top plate 100 Seat 200 Back support 300 Headrest 400 Pedestal 420 Vent 1000 Vehicle seat F1 Reaction force F2 Reaction force T1 Ischial tuberosity T2 Coccyx W1 Seating load W2 Seating load

Claims (6)

a seat body that supports the buttocks and thighs of a seated person;
A vehicle seat comprising a seat cover covering at least an upper surface of the seat body,
A cushion body is attached to the seat body below the seat cover,
The cushion body includes an outer bag and a plurality of inner bags arranged at predetermined positions inside the outer bag, and the bead material is accommodated in the bag in a flowable state. a plurality of inner bag bodies,
Each of the plurality of inner bag bodies allows air to flow in and out of the interior of the outer bag body,
Here, as the inner bag body:
(1) A pair of left and right first inner bag bodies arranged at positions for respectively receiving a pair of left and right ischial tuberosities of the buttocks of a seated person in a seated state;
(2) a second inner bag positioned to receive the coccyx of the buttocks of the occupant in the seated state; and
(3) a third inner bag positioned to receive the thighs of the person in the seated state;
A vehicle seat characterized by having at least: Reaction force generated in the second inner bag body according to the seating load of the seated person is configured to be smaller than reaction force generated in the first inner bag body according to the seating load of the seated person. The vehicle seat according to claim 1, wherein the vehicular seat is The filling rate of the bead material with respect to the bag volume of each of the pair of left and right first inner bag bodies is set higher than the filling rate of the bead material with respect to the bag body volume of the second inner bag body. 3. The vehicle seat according to claim 2, wherein Any one of claims 1 to 3, wherein the bead material is made of at least one resin selected from the group consisting of polyethylene, polypropylene, thermoplastic polyurethane (TPU), and thermoplastic elastomer (TPE). The vehicle seat described in . The vehicle seat according to any one of claims 1 to 4, wherein each of the plurality of inner bag bodies has air permeability and is made of an elastomer. When the reference weight is 70 kg, the air outflow speed from the inside of the outer bag body to the outside when the seated person of the reference weight is seated is set to 30 ml/second or less, and 6. The method according to any one of claims 1 to 5, wherein the volume reduction rate of the outer bag per second (air flow rate per second/total volume of the outer bag) is set to 10% or less. vehicle seat.

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