Vehicle seats

Abstract

To provide a vehicle seat that is able to prevent a surface of a seat body from wrinkling or loosening.SOLUTION: A vehicle seat S includes: a seat back 2; a movable body 30 that is mounted in the seat back 2 and is movable to project a central part 2A of the seat back 2 toward a seated occupant side (a seat front side); and a second movable body 40 that is mounted at a further outside position than the movable body 30 in the seat back 2 and is movable to project the side part 2B of the seat back 2 toward the seated occupant side. When the movable body 30 projects the central part 2A of the seat back 2 most, an end (a rear end) of the second movable body 40, which end is opposite the seated occupant side, is disposed further on the seated occupant side (the seat front side) than a seating surface of a central part of a seat body.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat provided with a movable body that moves to project a part of a seat body toward a seated person side from a normal position.

Background Art

[0002] Conventionally, a vehicle seat has been known which is attached inside a seat body on which a seated person sits and includes a movable body (for example, a side support member) that moves to project a part of the seat body (for example, a side portion) toward the seated person side from a normal position (see, for example, Patent Document 1). By providing the movable body, the holding performance of the vehicle seat can be enhanced according to the physique and preferences of the seated person.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a vehicle seat such as that of Patent Document 1, when the movable body projects a part of the seat body toward the seated person side, wrinkles or doubling may inadvertently occur on the surface of the seat body (specifically, on the skin material), and if so, there is a risk of impairing the appearance of the vehicle seat. For example, when a vehicle seat includes a movable body (a lumbar support member) for projecting the central portion of the seat body toward the seated person side and a second movable body (a side support member) for projecting the side portion of the seat body toward the seated person side, and these movable bodies are arranged side by side in the seat width direction, forces are applied to the surface of the seat body from a plurality of directions as these movable bodies operate, and there is a risk that wrinkles and doubling are likely to occur.

[0005] Furthermore, for example, when the second movable body causes the side portion of the seat body to protrude toward the occupant, there was a risk that wrinkles and looseness of the upholstery material would become noticeable at the boundary between the central and side portions of the seat body (specifically, the portion corresponding to the upholstery suspension groove).

[0006] Book The object of the invention is to provide a vehicle seat that can suppress wrinkles and sagging on the surface of the seat body, even when a part of the seat body protrudes toward the occupant. 。 [Means for solving the problem]

[0007] The aforementioned problem can be solved by the vehicle seat of the present invention. Seat back And, as stated above Seat back It is installed inside the above Seat back The center of the seat in the width direction is positioned differently from the normal position. arrival A movable body that moves to protrude toward the seated person, and the aforementioned Seat back It is mounted inside the movable body at a position outside the seat width direction, Seat back of Side section It comprises a second movable body that moves to protrude further toward the seated person than its normal position, The seat back comprises a cushioning material and a covering material for the cushioning material. The movable body and the second movable body are each provided on the back surface of the cushioning material. A covering groove is formed on the surface of the cushioning material for suspending the ends of the covering material. The covering groove is provided in the seat back at a position that divides the central part and the side part, and extends in the vertical direction. A cushion deformation suppression portion is formed on the back surface of the cushioning material in the portion corresponding to the covering groove to suppress deformation of the cushioning material around the covering groove. This will be resolved. 。

[0008] At this time, The seat back is constructed by covering a cushioning material with a surface material, the movable body is provided on the back surface of the cushioning material at the center of the seat back in the seat width direction and is movable to make the center of the seat back protrude, and the second movable body is provided on the back surface of the cushioning material at the side of the seat back and is movable to make the side of the seat back protrude. That would be good. Furthermore, the second movable body has a plurality of bags that expand when a fluid is sealed inside, and the plurality of bags are arranged at different positions in the front-rear direction of the seat, and it is preferable that when the movable body causes the central part of the seat back to protrude the most toward the occupant, the bags are positioned forward of the seat beyond the seating surface of the central part of the seat back. Furthermore, the second movable body has a plurality of bags that expand when a fluid is sealed inside, and the plurality of bags are arranged at different positions in the front-rear direction of the sheet, and it is preferable that the first bag located furthest forward of the sheet has the smallest capacity compared to the other bags. Furthermore, the seat back includes a back frame that forms the skeleton, and the back frame has back side frames that are arranged on the left and right sides in the width direction of the seat and extend in the vertical direction, and the second movable body has a base member supported by the back side frame and a plurality of bag bodies that are arranged in front of the seat position than the base member and are supported by the base member, and it is preferable that the plurality of bag bodies expand to cause the side portion to protrude toward the front of the seat. Furthermore, the base member is preferably attached to the front surface of the backside frame and extends along the front surface of the backside frame in the seat width direction. Furthermore, the second movable body is positioned in front of the base member and has a rotating member attached to the base member so as to be rotatable via a pivot axis, the plurality of bags are positioned between the base member and the rotating member, and the rotating member rotates so as the plurality of bags expand, causing the side portions to protrude toward the front of the seat. Furthermore, it is preferable that the cushion deformation suppression part is positioned further back in the seat than the rear end of the second movable body. Furthermore, it is preferable that the cushion deformation suppression portion is positioned further inward in the seat width direction than the inner end of the second movable body in the seat width direction. Furthermore, the seat cushion and headrest are provided, and the seat cushion comprises a cushion frame that forms the skeleton, a cushioning material placed on the cushion frame, and a surface material that covers the cushion frame and the cushioning material, and the headrest comprises a pillar that forms the core of the headrest, a cushioning material placed on the pillar, and a surface material that covers the pillar and the cushioning material. [Effects of the Invention]

[0014] According to the present invention, it is possible to realize a vehicle seat that can suppress the occurrence of wrinkles and doubling on the surface of the seat body. for example, At a predetermined part of the seat back, the deformation of the cushion material is suppressed, and the occurrence of wrinkles and doubling on the skin material of the seat back can be suppressed. 。

Brief Description of the Drawings

[0015] [Figure 1] It is an external perspective view of the vehicle seat of the present embodiment. [Figure 2] It is a perspective view showing a seat frame serving as a skeleton. [Figure 3] It is a sectional view taken along the line III-III of FIG. 1, and is a view for explaining a state where the movable body and the second movable body are movable. [Figure 4] It is a schematic view showing a movable body, a second movable body, and an operating device. [Figure 5A] It is a sectional view of the seat back, and is a view for explaining a state where the second movable body is not movable and the side portion of the seat back is in the "normal position". [Figure 5B] It is a view for explaining a state where the second movable body is movable and the side portion of the seat back is in the "protruding position". [Figure 6] It is a view showing a first modification example of the second movable body, and is a sectional view of the seat back. [Figure 7] It is a view showing a second modification example of the second movable body, and is a sectional view of the seat back. [Figure 8] It is a perspective view showing a seat frame of a vehicle seat according to a second embodiment. [Figure 9] It is a sectional view taken along the line IX-IX of FIG. 8, and is a view for explaining the positional relationship between the movable body, the second movable body, and the third movable body.

Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments according to the present invention will be described with reference to FIGS. 1 to 9. This embodiment relates to an invention of a vehicle seat, comprising a seat body, a movable body attached inside the seat body that moves to cause the central part of the seat body in the seat width direction to protrude toward the seated person (forward side of the seat), and a second movable body attached inside the seat body at a position further outward in the seat width direction than the movable body that moves to cause the side part of the seat body to protrude toward the seated person, wherein when the movable body causes the central part of the seat body to protrude the most, the end of the second movable body opposite to the seated person is positioned toward the seated person than the seating surface of the central part of the seat body. In vehicle seats, the side where the occupant sits is considered the front of the seat relative to the seatback.

[0017] As shown in Figure 1, the vehicle seat S of this embodiment is a vehicle seat comprising a seat body having a seat cushion 1, a seat back 2, and a headrest 3; a movable body 30 (lumbar support member) attached inside the seat back 2 and movable to cause the central part 2A of the seat back 2 to protrude toward the occupant beyond its normal position; a second movable body 40 (side support member) attached inside the seat body and movable to cause the side part 2B of the seat back 2 to protrude toward the occupant beyond its normal position; and an actuator 50 (fluid supply device) that operates to move the movable body 30 and the second movable body 40.

[0018] As shown in Figure 1, the seat cushion 1 is a seating portion that supports the occupant from below, and is constructed by placing a cushioning material 1a on a cushion frame 10, which serves as the skeleton, as shown in Figure 2, and covering it with a surface material 1b. The seat cushion 1 consists of a central part 1A located in the center of the seat width direction, and left and right side parts 1B (side bolster parts) located outside the central part 1A in the seat width direction. The cushioning material 1a is a pad component made of foamed urethane or the like. On the surface of the cushioning material 1a, left and right surface-hanging grooves 1aa are formed, extending in the front-to-back direction of the seat to separate the central part 1A from the left and right side parts 1B.

[0019] As shown in Figure 1, the seat back 2 is a backrest that supports the seated person's back from behind, and is constructed by placing a cushioning material 2a on a back frame 20, which forms the skeleton, as shown in Figure 2, and covering it with a surface material 2b. The seat back 2 consists of a central section 2A located in the center of the seat width direction, and left and right side sections 2B (side bolster sections) located outside the central section 2A in the seat width direction. On the surface of the cushioning material 2a, left and right skin-hanging grooves 2aa are formed, extending vertically to separate the central part 2A from the left and right side parts 2B.

[0020] As shown in Figure 1, the headrest 3 is a headrest that supports the occupant's head from the rear, and is constructed by placing a cushioning material 3a on a pillar 3c which serves as the core material, and covering it with a surface material 3b. Furthermore, a pillar mounting member 26 for attaching the pillar 3c that supports the main body of the headrest 3 is assembled to the upper part of the back frame 20.

[0021] As shown in Figure 2, the cushion frame 10 consists of a roughly rectangular frame-like body and is mainly composed of cushion side frames 11 arranged on the left and right sides, a plate-shaped pan frame 12 (erecting frame) erected on the front end portion of each cushion side frame 11, a rear connecting frame 13 that connects the rear portions of each cushion side frame 11, and a plurality of elastic springs 14 (elastic support members) that are attached to the pan frame 12 and the rear connecting frame 13 and extend in a snake-like manner in the front-rear direction of the seat.

[0022] The cushion side frame 11 is a long, plate-shaped frame in the front-to-back direction of the seat. A reclining device 4 is attached to the rear portion of the cushion side frame 11, and a rail device 6 is attached to its lower portion via a height link device 5.

[0023] As shown in Figures 2 and 3, the back frame 20 consists of a roughly rectangular frame-like body and is mainly composed of back side frames 21 arranged on the left and right sides, an inverted U-shaped upper frame 22 connecting the upper ends of each back side frame 21, a plate-shaped lower frame 23 connecting the lower ends of each back side frame 21, a plurality of wire members 24 (elastic wires) that are hooked onto each back side frame 21 and extend in a snake-like manner in the seat width direction, and a support plate 25 that is held by the plurality of wire members 24 and supports the seated person. The back frame 20 is attached to the central part of the upper frame 22 in the seat width direction and further includes a pillar mounting member 26 for attaching the pillar 3c of the headrest 3.

[0024] The backside frame 21 is a sheet metal member that extends vertically and has a substantially C-shaped cross-section, and its lower end is connected to the rear end of the cushion side frame 11 via a reclining device 4. In the above configuration, the back frame 20 is capable of relative rotation with respect to the cushion frame 10.

[0025] In the above configuration, as shown in Figure 2, a movable body 30 is attached to the front surface of the lower part of the support plate 25. Furthermore, as shown in Figures 2 and 3, the left and right second movable bodies 40 are attached to the front of the lower portion of the left and right backside frames 21.

[0026] As shown in Figures 2-5A and B, the movable body 30 has a bag-like structure (air cell) that expands when a fluid is sealed inside. When compressed air is sealed inside as the fluid, it expands towards the seated person (protruding from the normal position to the protruding position), and when the sealed compressed air is released, it contracts (returns to the normal position). Specifically, the movable body 30 is a lumbar support member that supports the lower back of the seated person, and is positioned between the cushioning material 2a and the support plate 25 in the central part 2A of the lower portion of the seat back 2. It is a movable member that causes the central part 2A (cushioning material 2a) to protrude toward the seated person. The movable body 30 is attached to the front of the support plate 25 in a folded state.

[0027] The movable body 30 has a roughly rectangular shape that is elongated in the width direction of the sheet, and is mainly composed of a base member 31 (base plate) supported by a support plate 25, and a bag body 32 supported on the front surface of the base member 31. The bag 32 can expand towards the front of the sheet by being filled with compressed air from its folded state.

[0028] As shown in Figures 2-4, the second movable body 40 has a bag-like structure (air cell) that expands toward the seated person when compressed air is sealed inside (protruding from the normal position to the protruding position), and contracts when the sealed compressed air is released (returning to the normal position). Specifically, the second movable body 40 is a side support member that supports the seated person from the side, and is positioned between the cushioning material 2a and the backside frame 21 in the side portion 2B of the lower part of the seat back 2. It is a movable member that causes the side portion 2B (cushioning material 2a) to protrude toward the seated person (towards the front of the seat and inward in the seat width direction). The second movable body 40 is attached to the front of the backside frame 21 in a folded state.

[0029] The second movable body 40 has a roughly pentagonal shape that is elongated in the vertical direction, and mainly consists of a base member 41 supported by the back side frame 21, a rotating member 43 positioned in front of the seat of the base member 41 and attached to the base member 41 so as to be rotatable via a pivot shaft 42, and a plurality of bag bodies 44 positioned between the base member 41 and the rotating member 43 and supported on the front surface of the base member 41.

[0030] The base member 41 is attached to the front of the backside frame 21 and extends along the front of the backside frame so as to protrude in the seat width direction. The pivot shaft 42 is attached to the inner end of the front surface of the base member 41 in the width direction of the sheet. The rotating member 43 is mounted to the base member 41 so as to be rotatable in the front-rear direction of the seat, and by rotating toward the front of the seat, it can cause the side portion 2B of the seat back 2 to protrude (push out) toward the front of the seat. Furthermore, the rotating member 43 is a plate body with a slightly curved shape that is curved towards the front of the seat. As a result, the contact area between the rotating member 43 and the cushioning material 2a is somewhat reduced, and the pushing force of the rotating member 43 is efficiently transmitted to the cushioning material 2a. The rotating member 43 is positioned towards the base member 41 when the seat back 2 is in its normal position. It may also be biased towards the base member 41 by a biasing spring (biasing member) not shown.

[0031] Multiple bag bodies 44 are supported by a base member 41, and when compressed air is sealed inside, they expand toward the front of the sheet, pushing the rotating member 43 toward the front of the sheet. In other words, the rotating member 43 can be rotated toward the front of the sheet.

[0032] Multiple bag bodies 44 are arranged at different positions in the front-to-back direction and the width direction of the sheet, and each is made up of a different size. More specifically, the multiple bags 44 are composed of three bags, with the first bag 44a, located furthest forward on the sheet, having the smallest capacity compared to the other bags. The second bag 44b has the largest capacity, and the third bag 44c has a medium capacity. With the above configuration, the direction and amount of protrusion of the seat back 2 (side portion 2B) can be adjusted by inflating multiple bag bodies 44 of different positions and sizes. Furthermore, by adjusting the direction and amount of protrusion of the side portion 2B of the seat back 2, it is possible to suppress wrinkles and sagging in the surface material 2b of the seat back 2.

[0033] As shown in Figures 2 and 4, the actuator 50 is installed inside the sheet body and is a fluid supply device for supplying compressed air to the movable body 30 (bag body 32) and the second movable body 40 (bag body 44). The actuator 50 mainly consists of an air control unit 51 attached to the outer surface of the backside frame 21, an air pump 52 attached to the back surface of the cushion frame 10 (pan frame 12) for supplying (intake) and discharging (exhaust) compressed air, and an air piping 53 connecting the air pump 52 and the movable body 30 (second movable body 40).

[0034] The air control unit 51, for example, receives a predetermined user operation selection by a seated person, receives a predetermined control signal, and controls the air pump 52 to supply compressed air to the bags 32 and 44, or to discharge compressed air from the bags 32 and 44. By doing so, the range of motion of the movable body 30 and the second movable body 40 can be adjusted according to the physique of the person sitting.

[0035] In the above configuration, as shown in Figure 3, when the movable body 30 protrudes the central portion 2A of the seat back 2 to its furthest forward position, the rear end of the second movable body 40 is positioned further forward than the seating surface of the central portion 2A of the seat back 2. In other words, the multiple bag-like structures 44 are positioned forward of the seat, beyond the seating surface of the central part 2A of the seat back 2. Therefore, it is possible to suppress wrinkles and looseness in the surface material 2b of the seat back 2. More specifically, the movable body 30 and the second movable body 40 are positioned at different locations in the seat width direction and at different locations in the seat front-to-back direction. As a result, even when these movable bodies 30 and 40 move simultaneously, the direction and position of the forces applied to the surface material 2b of the seat back 2 can be made different. Therefore, wrinkles and sagging of the surface material 2b of the seat back 2 can be suppressed.

[0036] Next, the operation of the second movable body 40 will be described in detail based on Figures 5A and 5B. The second movable body 40 can move (bulge out) the side portion 2B of the seat back 2 from the "normal position" shown in Figure 5A to the "protruding position" shown in Figure 5B.

[0037] Figure 5A is a cross-sectional view of the seat back 2, showing the seat back 2 with its side portion 2B in the "normal position". The second movable body 40 is positioned between the back frame 20 and the upholstery material 2b in the front-rear direction of the seat. Specifically, it is attached to the front of the back side frame 21 and is positioned on the back surface of the cushioning material 2a.

[0038] Figure 5B shows the state in which the second movable body 40 (rotating member 43) protrudes forward of the seat, and the side portion 2B of the seat back 2 moves from the "normal position" to the "protruding position". Specifically, by receiving compressed air from the actuator 50, the folded bag body 44 expands and unfolds toward the front of the sheet, pushing the rotating member 43 toward the front of the sheet, causing the side portion 2B to move toward the front of the sheet. As a result, the side portion 2B moves to the "protruding position". Furthermore, the compressed air inside the bag 44 is discharged by the actuator 50, causing the inflated bag 44 to contract and the side portion 2B to move backward towards the seat. As a result, the side portion of the seat back 2 returns from the "protruding position" to the "normal position".

[0039] In the above configuration, as shown in Figure 5B, the second movable body 40 (bag body 44) is configured to cause the side portion 2B of the seat back 2 to protrude forward of the seat and inward in the seat width direction. By doing so, the seating experience for the person sitting can be improved.

[0040] <Modified versions 1 and 2 of the second movable body> Next, we will explain two modified examples of the "second movable body" based on Figures 6 and 7. Note that explanations that overlap with the vehicle seat S mentioned above will be omitted.

[0041] The second movable body 40 of the modified example 1 consists of a base member 41 supported by a backside frame 21 and a plurality of bag bodies 44 supported on the front surface of the base member 41. Multiple bag bodies 44 are supported by a base member 41 and can expand towards the front of the sheet when compressed air is sealed inside from a folded state. The multiple bags 44 are attached to the base member 41 by attachment members 45 provided on the inner end of the front surface of the base member 41 in the sheet width direction.

[0042] Figure 6 shows the state in which the second movable body 40 (bag body 44) protrudes forward of the seat, and the side portion 2B of the seat back 2 moves from the "normal position" to the "protruding position". Specifically, by receiving compressed air from the actuator 50, the folded bag body 44 expands and unfolds forward of the seat, directly pushing the side portion 2B forward of the seat. As a result, the side portion 2B of the seat back 2 moves to the "protruding position".

[0043] In the above configuration, as shown in Figure 6, a cushion deformation suppression part 46 is attached to the portion of the back surface of the cushion material 2a that corresponds to the surface suspension groove 2aa, in order to suppress deformation of the cushion material 2a around the surface suspension groove 2aa. More precisely, "the area around the surface lifting groove 2aa" refers to a location outside the surface lifting groove 2aa in the sheet width direction. The cushion deformation suppression part 46 is a resin plate attached to the back surface of the cushion material 2a, and is positioned behind the rear end of the second movable body 40 and inside the seat width direction of the inner end of the second movable body 40 in the seat width direction. Therefore, wrinkles and sagging of the upholstery material 2b of the seat back 2 can be suppressed. In particular, wrinkles and sagging of the upholstery material 2b can be suppressed at the boundary between the central part 2A and the side part 2B of the seat back 2 (the part corresponding to the upholstery suspension groove 2aa). Furthermore, the cushion deformation suppression section 46 may be a fabric-like material such as nonwoven fabric instead of a resin plate.

[0044] The second movable body 40 of the modified example 2 consists of a base member 41, a rotating member 43 attached to the base member 41 so as to be rotatable via a pivot shaft 42, and a single bag-shaped body 44 positioned between the base member 41 and the rotating member 43 and supported on the front surface of the base member 41. Figure 7 shows the state in which the second movable body 40 (bag body 44) protrudes forward of the seat, and the side portion 2B of the seat back 2 moves from the "normal position" to the "protruding position".

[0045] In the above configuration, as shown in Figure 7, a cushion deformation suppression part 46 is attached to the portion of the back surface of the cushion material 2a that corresponds to the surface suspension groove 2aa, in order to suppress deformation of the cushion material 2a around the surface suspension groove 2aa. The cushion deformation suppression portion 46 is a cushion thickness portion provided on the back surface of the cushion material 2a, and is positioned rearward of the seat than the second movable body 40, and is positioned inward in the seat width direction than the second movable body 40. Therefore, it is possible to suppress wrinkles and looseness of the surface material 2b at the boundary between the central part 2A and the side part 2B of the seat back 2 (the part corresponding to the surface material hanging groove 2aa). Furthermore, the cushion deformation suppression portion 46 may be formed as a portion with high hardness (high-hardness cushion portion) instead of the cushion thickness portion.

[0046] <Second embodiment of a vehicle seat> Next, the vehicle seat S2 of the second embodiment will be described with reference to Figures 8 and 9. Note that explanations that overlap with the vehicle seat S mentioned above will be omitted. The vehicle seat S2 comprises a seat body, a movable body 130 (lumbar support member), a second movable body 140 (side support member), an operating device 150 (fluid supply device), a third movable body 160 (shoulder support member) that moves to cause the upper part of the seat back 2 to protrude further toward the occupant than its normal position, and a drive device 170 that drives the third movable body 160.

[0047] The third movable body 160 is a shoulder support member for supporting the shoulders of a seated person. Specifically, the third movable body 160 comprises a movable main body 161 positioned in the upper part of the back frame 120, and a pivot shaft 162 that connects the movable main body 161 and the back frame 120 and is rotatably mounted to the back frame 120 together with the movable main body 161. The drive unit 170 is an actuator fixed to the back surface of the backside frame 121 and driven to rotate the pivot shaft 162. With the above configuration, the third movable body 160 can be rotated in the seat-forward direction relative to the back frame 120 by driving the drive unit 170.

[0048] In the above configuration, as shown in Figure 9, the second movable body 140 is positioned further forward of the seat than the third movable body 160. In other words, the second movable body 140 is positioned forward of the seat compared to the pivot axis 162 of the third movable body 160. Therefore, interference between the second movable body 140 (side support member) and the third movable body 160 (shoulder support member) can be suppressed, allowing these support members 140 and 160 to operate stably.

[0049] <Other embodiments> In the above embodiment, as shown in Figure 1, the movable bodies 30 and 40 are attached to the seat back 2, but they are not particularly limited and may be attached to the seat cushion 1.

[0050] In the above embodiment, as shown in Figures 5A and 5B, the movable bodies 30 and 40 are configured as bags (air cells), and the actuator 50 is configured as a fluid supply device, but these can be modified without particular limitation. For example, the "movable body" and the "actuator" may be composed of mechanical mechanisms. Specifically, the "movable member" may be configured to move by link mechanisms, hinge mechanisms, etc., and the "actuator" may be composed of motor-driven or hydraulic drive devices, etc.

[0051] In the above embodiment, as shown in Figures 5A and 5B, the movable bodies 30 and 40 are arranged on the back side of the cushioning material 2a, but they may also be arranged on the front side of the cushioning material 2a, without any particular limitation.

[0052] In the above embodiment, as shown in Figure 5B, the second movable body 40 causes the side portion 2B of the seat back 2 to protrude forward of the seat and inward in the seat width direction. However, it is not particularly limited, and it may protrude only forward of the seat, or only inward in the seat width direction.

[0053] In the above embodiment, a vehicle seat used in an automobile was described as a specific example, but it is not particularly limited and can be used for various types of seats, including motorcycle seats, seats in trains and buses, seats in airplanes and ships, as well as office chairs for work, wheelchairs, and children's seats in shopping carts.

[0054] In this embodiment, the vehicle seat according to the present invention was described primarily. However, the embodiments described above are merely examples to facilitate understanding of the present invention and do not limit it. The present invention can be modified and improved without departing from its spirit, and of course, equivalents thereof are included. [Explanation of Symbols]

[0055] S Vehicle Seat Sa seat frame 1 seat cushion 1A, 2A central part 1B, 2B, 102B, 202B side section 1a, 2a, 3a Cushioning material 1aa, 2aa Skin suspension groove 1b, 2b, 3b Skin material 2, 102, 202 Seatback 3 Headrests 3c pillar 4. Reclining device 5. Height Link Device 6 Rail device 10 Cushion Frames 11 Cushion side frame 12 Pan Frames 13. Rear connecting frame 14. Elastic spring (elastic support member) 20, 120 back frame 21, 121 Backside Frame 22 Upper frame (connecting frame) 23 Lower frame 24 Wire components 25 Support plate 26 Pillar mounting components 30, 130 Movable parts (lumbar support members) 31 Base member 32 Bag body 40, 140 Second movable body (side support member) 41 Base member 42 pivot shafts 43 Rotating Member 44 Bag body 44a~44c 1st bag ~ 3rd bag 45 Mounting components 46 Cushion deformation suppression part 50, 150 Actuator (fluid supply device) 51 Air control unit 52 Air pump 53 Air Piping 160 Third movable part (shoulder support member) 161 Movable body part 162 Rotary shaft 170 Drive unit

Claims

1. A seat back and A movable body is attached inside the seat back and moves to cause the central part of the seat back in the seat width direction to protrude further toward the occupant than its normal position, The seat back includes a second movable body, which is mounted inside the seat back at a position outside the movable body in the seat width direction, and which moves to cause the side portion of the seat back to protrude toward the occupant than its normal position. The seat back comprises a cushioning material and a covering material that covers the cushioning material. The surface of the cushioning material has surface suspension grooves formed therein for suspending the ends of the surface material. The aforementioned upholstery suspension groove is provided in the seat back at a position that separates the central portion and the side portion, and extends in the vertical direction. A seat for a vehicle, characterized in that a cushion deformation suppression portion is formed on the back surface of the cushioning material in a portion corresponding to the surface suspension groove, for suppressing deformation of the cushioning material around the surface suspension groove.

2. The aforementioned seat back is constructed by covering a cushioning material with a surface material. The movable body is provided on the back surface of the cushioning material at the center of the seat back in the seat width direction, and is movable to cause the center of the seat back to protrude. The vehicle seat according to claim 1, wherein the second movable body is provided on the back surface of the cushioning material at the side portion of the seat back and is movable to cause the side portion of the seat back to protrude.

3. The second movable body has a plurality of bags that expand when a fluid is sealed inside, The aforementioned plurality of bags are They are positioned at different locations in the front-to-back direction of the seat. The vehicle seat according to claim 1 or 2, characterized in that when the movable body is positioned so as to protrude the central part of the seat back the most towards the seated person, it is positioned in front of the seat of the seat back's central seating surface.

4. The second movable body has a plurality of bags that expand when a fluid is sealed inside, The plurality of bag bodies are arranged at different positions in the front-to-back direction of the sheet. The vehicle seat according to any one of claims 1 to 3, characterized in that, among the plurality of bag bodies, the first bag body located furthest forward of the seat has the smallest capacity compared to the other bag bodies.

5. The aforementioned seat back is equipped with a back frame that forms the skeleton, The aforementioned back frame has back side frames positioned on the left and right sides in the seat width direction and extending in the vertical direction. The second movable body is A base member supported by the aforementioned backside frame, The plurality of bag bodies are positioned in front of the base member and supported by the base member, The vehicle seat according to claim 3 or 4, characterized in that the multiple bag bodies expand, causing the side portion to protrude toward the front of the seat.

6. The vehicle seat according to claim 5, characterized in that the base member is attached to the front surface of the backside frame and extends in the seat width direction along the front surface of the backside frame.

7. The second movable body is positioned in front of the seat than the base member and has a rotating member that is attached to the base member so as to be rotatable via a pivot axis. The plurality of bag bodies are arranged between the base member and the rotating member, The vehicle seat according to claim 5 or 6, characterized in that the rotating member rotates so that the side portion protrudes toward the front of the seat as the plurality of bag bodies expand.

8. The seat for a vehicle according to claim 1, characterized in that the cushion deformation suppression part is positioned further back than the rear end of the second movable body.

9. The seat for a vehicle according to claim 1 or 8, characterized in that the cushion deformation suppression portion is positioned further inward in the seat width direction than the inner end of the second movable body in the seat width direction.

10. A seat cushion and a headrest are provided, The aforementioned seat cushion comprises a cushion frame that forms the skeleton, a cushioning material placed on the cushion frame, and a surface material that covers the cushion frame and the cushioning material. The vehicle seat according to any one of claims 1 to 9, characterized in that the headrest comprises a pillar which serves as the core material of the headrest, a cushioning material which is placed on the pillar, and a surface material which covers the pillar and the cushioning material.

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