JP2017218025A - Lumbar support device and vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lumbar support device which can support a lumbar part of a seating person and a wide area near the lumber part and provides comfort to the seating person.SOLUTION: A lumbar support device 19 is used in a vehicle seat having a seat cushion which receives a hip of a seating person and a seat back which receives a back of the seating person. The lumbar support device 19 has: a first pressing member 31 which presses a first area of the seat back from an interior part of the seat back; and a second pressing member 32 which presses a second area of the seat back, which is an area lower than the first area, from an inner side of the seat back. The second pressing member presses the second area of the seat back at the same time as when the first pressing member 31 presses the first area of the seat back. Since the first area and the second area are simultaneously supported, the seating person sits comfortably.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lumbar support device that supports a part of a back portion of a seated person. The present invention also relates to a vehicle seat using the lumbar support device. The vehicle is, for example, an automobile, a train, an airplane, a ship, other vehicles, and the like.

  Conventionally, a lumbar support device disclosed in Patent Document 1 is known. In this conventional lumbar support device, the first region of the seat back corresponding to the portion from the seated lumbar vertebra to the thoracic vertebra is supported, but the seat back corresponding to the portion from the seated pelvis to the lumbar spine is supported. There was a problem that the two regions (that is, the region lower than the first region) were not sufficiently supported.

  Further, although not known at the present time, another lumbar support device is described in Japanese Patent Application No. 2015-210782 filed by the present applicant. In this lumbar support device, the first pressing portion supports the first region of the seat back, and the lower pressing portion supports the second region of the seat back (that is, a region lower than the first region). In this lumbar support device, either one of the first region and the second region is supported by the pressing portion, but a technique for simultaneously supporting both the first region and the second region is not shown. For this reason, this lumbar support device has a problem that it cannot support the waist of the seated person and a wide area in the vicinity thereof.

Japanese Utility Model Publication No. 6-001004

  The present invention has been made in view of the above-described problems in the conventional apparatus, and can support a seated person's waist and a wide area in the vicinity thereof, and can provide a comfortable sitting comfort to the seated person. An object is to provide a support device and a vehicle seat.

  A lumbar support device according to the present invention is a lumbar support device used in a vehicle seat having a seat cushion that receives a seated person's buttocks and a seat back that receives the back part of the seated person. A first pressing member that presses the region from the inside of the seat back; and a second pressing member that presses the second region of the seat back that is lower than the first region from the inside of the seat back. The second region of the seat back is pressed by the second pressing member simultaneously with the pressing of the first region of the seat back by the first pressing member.

  In the above configuration, the first pressing member and the second pressing member may be an integral member or separate members. An “integral member” is a member that moves together without relatively moving. “Separate members” are members that can move independently without being constrained to each other.

  According to the present invention, the first region, which is a high region of the seat back, and the second region, which is a low region, are pressed simultaneously by the first pressing member and the second pressing member. That is, the first region and the second region are supported simultaneously by the lumbar support device. As a result, the waist of the seated person and a wide area in the vicinity thereof can be supported, and a comfortable sitting comfort can be provided for the seated person.

  According to another aspect of the present invention, the timing of pressing the first region of the seat back by the first pressing member and the timing of pressing the second region of the seat back by the second pressing member are both This includes both the time when the pressing of the two overlaps and the time when only one of the pressings is performed.

  According to this aspect of the invention, apart from the timing at which the first region and the second region are simultaneously supported, there is a timing at which only one of the first region or the second region is supported. According to this configuration, it is possible to support only a desired partial region of the seated person's waist and a wide region in the vicinity thereof as required by the seated person. Thereby, the convenience of the seated person is improved.

  In still another aspect of the present invention, an interposition member is provided inside the seat back, the interposition member is provided across the first region and the second region, and the interposition member is A pressing member moving means is provided which is movable so as to approach or move away from the seat back seat receiving surface, and which integrally moves the first pressing member and the second pressing member toward the interposition member. The second pressing member that is moved by the pressing member moving means at the same time that the first pressing member that is moved by the pressing member moving means presses the first region of the seat back via the interposition member. Presses the second region of the seat back through the interposition member.

  In the above configuration, “movable” means “movable freely”. In addition, the movement of the first pressing member and the second pressing member “integrally” means that the first pressing member and the second pressing member move “together without relatively moving”.

  According to this aspect of the present invention, the pressing state of the first region by the first pressing member and the pressing state of the second region by the second pressing member can be variously adjusted by variously adjusting the shape and material of the interposed member.

  In still another aspect of the present invention, the interposition member is a plate-like member that is not easily deformed, and the interposition member is suspended so as to be freely swingable at a position above the first region, By the swing, the interposition member is movable so as to approach or move away from the surface of the seat back where the seated person is received.

  According to this aspect of the invention, the pressing force by the first pressing member and the second pressing member can be efficiently transmitted to the front portion of the seat back without being attenuated by the interposition member.

  In still another aspect of the present invention, a base member is provided, a step member is provided on the base member, and the step member has a high step portion and a low step portion. The height of the high step portion from the base shaft member is higher than the height of the low step portion from the base shaft member, and the first pressing member is formed by the high step portion, and the second pressing portion is The member is formed by the low-stage portion, and the pressing member moving means rotates the base shaft member about its own axis, or swings the base shaft member, thereby moving the first pressing member and the pressing member. The second pressing member is integrally moved toward the interposition member, and an intervening convex portion is provided at a portion of the interposition member at a position corresponding to the low step portion of the stepped member, and the pressing member moving means Before moved by The first pressing member and the stepped member come into contact with the surface of the interposed member, and the lower step portion moved by the pressing member moving means contacts the interposed convex portion of the interposed member. The second pressing member presses the first area and the second area of the seat back simultaneously.

  According to this aspect of the present invention, the mechanism for driving the first pressing member and the second pressing member can have a simple structure. For this reason, the mechanism which drives the 1st pressing member and the 2nd pressing member can be assembled | attached in a narrow space.

  In still another aspect of the present invention, an angle α of the first pressing member with respect to the base shaft member and an angle β of the second pressing member with respect to the base shaft member are different from each other.

  According to this aspect of the invention, by appropriately adjusting the angle α and the angle β, the pressing time of the first region by the first pressing member and the pressing time of the second region by the second pressing member can be adjusted to desired times. .

  In still another aspect of the present invention, the interposition convex portion is an inclined surface provided from a region corresponding to the first region to a region corresponding to the second region, and the inclined surface is the first region. The inclined surface is low on the side and high on the second region side.

  According to this aspect of the invention, by adjusting the inclination angle of the inclined surface, the pressing time of the first region by the first pressing member and the pressing time of the second region by the second pressing member can be adjusted to desired times.

  In still another aspect of the present invention, the inclined surface is a curved surface corresponding to the movement locus of the second pressing member. With this configuration, the second region can be smoothly pressed by the second pressing member.

  In still another aspect of the present invention, the first region of the seat back is a region corresponding to a portion from the seated person's lumbar vertebra to the thoracic vertebra, and the second region of the seat back is from the seated person's pelvis to the lumbar spine. It is an area corresponding to the part. With this configuration, the sitting comfort of the seated person can be reliably increased.

  Next, a vehicle seat according to the present invention includes a seat cushion that receives a seated person's buttocks, a seat back that receives the seated person's back, and a lumbar support device that supports a part of the seated person's back. In the vehicle seat, the lumbar support device is the lumbar support device according to each aspect of the invention described above.

  According to the vehicle seat of the present invention, the first region, which is a high region of the seat back, and the second region, which is a low region, are simultaneously pressed by the first pressing member and the second pressing member of the lumbar support device. That is, the first region and the second region are supported simultaneously by the lumbar support device. As a result, the waist of the seated person and a wide area in the vicinity thereof can be supported, and a comfortable sitting comfort can be provided for the seated person.

  According to the lumbar support device and the vehicle seat according to the present invention, the first region that is the high region of the seat back and the second region that is the low region are simultaneously pressed by the first pressing member and the second pressing member of the lumbar support device. It is done. That is, the first region and the second region are supported simultaneously by the lumbar support device. As a result, the waist of the seated person and a wide area in the vicinity thereof can be supported, and a comfortable sitting comfort can be provided for the seated person.

It is a perspective view showing one embodiment of a vehicular seat concerning the present invention. It is a perspective view which shows the cushion frame and back frame which are the frame | skeleton structures of the vehicle seat of FIG. It is a perspective view which shows the structure of the rear part of the principal part of the frame structure of FIG. It is a disassembled perspective view which shows one Embodiment of the lumbar support apparatus which concerns on this invention. It is a figure which shows operation | movement of the principal part of the lumbar support apparatus of FIG. It is a figure which shows the other operation | movement condition of the structure of FIG. It is a longitudinal cross-sectional view which shows the cross-section of the principal part of the vehicle seat of FIG. It is a figure which shows the other operation | movement condition of the structure of FIG. It is a figure which shows the physical condition of the seated person relevant to the lumbar support apparatus and vehicle seat of this invention.

  Hereinafter, a lumbar support device and a vehicle seat according to the present invention will be described based on embodiments. Of course, the present invention is not limited to this embodiment. In addition, in the drawings attached to the present specification, components may be shown in different ratios from actual ones in order to show characteristic parts in an easy-to-understand manner.

  FIG. 1 shows an embodiment of a vehicle seat according to the present invention. The vehicle seat 1 shown here has a seat cushion 2 that receives a seated person's buttocks, a seat back 3 that receives the back part of the seated person, and a headrest 4 that receives the head of the seated person. The seat cushion 2 is fixed to the floor of the vehicle at the base member 5. Although three base members 5 provided at three corners of the seat cushion 2 are shown in FIG. 1, actually, the base member 5 is also provided at the remaining one corner of the seat cushion 2.

  In the present embodiment, the headrest 4 has support columns 7a and 7b. The headrest 4 is attached to the seat back 3 by inserting these columns 7 a and 7 b into holes 6 a and 6 b provided in the upper part of the seat back 3. The headrest 4 is movable in the vertical direction on the upper surface of the seat back 3. The headrest 4 can also be removed from the seat back 3. Instead of such a configuration, the headrest 4 may be provided integrally with the seat back 3. Such a configuration is sometimes called a headrest-integrated seat back or a headrest-integrated vehicle seat.

  The first area A1 of the seat back 3 is an area corresponding to a portion B1 extending from the seated person's lumbar vertebra to the thoracic vertebra in FIG. A second region A2 of the seat back 3 in FIG. 1 is a region corresponding to a portion B2 from the seated person's pelvis to the lumbar spine in FIG. The seated person here is an adult having a height of about 140 cm to 190 cm.

  In FIG. 1, a cushion frame 11 having a skeleton structure is provided inside a seat cushion 2. A back frame 12 having a skeleton structure is provided inside the seat back 3. As shown in FIG. 2, the cushion frame 11 and the back frame 12 are connected by a reclining mechanism 13. By the action of the reclining mechanism 13, the back frame 12 can be tilted with respect to the cushion frame 11.

  The back frame 12 includes a right side frame 14 a, a left side frame 14 b, and a top frame 15. A cushion spring 18 is provided at a substantially central position of the back frame 12. The cushion spring 18 is stretched over the right side frame 14a and the left side frame 14b. The cushion spring 18 is provided to provide a good sitting comfort for the seated person.

(Lumbar support device)
A lumbar support device 19 is provided between the cushion spring 18 and the lower end of the back frame 12. The lumbar support device 19 includes a pressing unit 20, a drive device 21, and an interposition member 22.

(Intervening member)
The interposition member 22 is a plate-like member having a thickness of several mm to several tens mm formed of synthetic resin, metal, or the like. The interposition member 22 is not an amorphous flexible member and is a member that does not easily deform. In order to enhance the property of not deforming, an uneven pattern (pattern) for increasing the strength may be provided in the plane of the interposed member 22 in some cases.

  FIG. 3 shows a state in which the interposition member 22 is viewed from the rear region of the back frame 12 according to the arrow C in FIG. As shown in FIG. 3, hook members 25, 25 are provided on the upper side of the interposition member 22. The interposition member 22 is suspended from the cushion spring 18 by the hook members 25, 25. The cushion spring 18 is a position above the first region A1 of the seat back 3 in FIG. In FIG. 2, the lower side of the interposed member 22 is a free end without being connected to other members. With this structure, the interposition member 22 is movable in the left-right and up-down directions as long as the elasticity of the cushion spring 18 allows. “Free” means that you can move freely. Further, the interposition member 22 can freely move in the vertical direction as long as the hook member 25 does not come off the cushion spring 18. With the above configuration, the interposition member 22 is suspended so as to be freely slidable (that is, in a state where it can freely sway) at a position above the first region A1.

  The interposition member 22 is provided from the first area A1 to the second area A2 of the seat back 3 of FIG. In addition, the interposition member 22 is movable inside the seat back 3 so as to approach or move away from the surface of the seat back 3 shown in FIG.

  FIG. 4 shows the structure of the back part of the interposition member 22 according to the arrow C in FIG. Intervening convex portions 26 and 26 are provided on the back surface of the intervening member 22. When the interposition member 22 is formed of synthetic resin, the interposition protrusions 26 and 26 are simultaneously formed by integral molding when the interposition member 22 is formed. Further, when the interposition member 22 is formed of a material other than the synthetic resin, the interposition convex portion 26 is formed in a timely step in a series of steps for manufacturing the interposition member 22.

  The interposition convex part 26 is provided from 1st area | region A1 of the seat back 3 of FIG. 1 to 2nd area | region A2. The intervening convex portion 26 is an inclined surface that is low on the first region A1 side and high on the second region A2 side. The upper surface of the intervening convex portion 26 is a curved surface that is convex downward with a relatively large curvature.

(Pressing unit)
In FIG. 4, the pressing unit 20 is formed by fixing a stepped member 30 on a base shaft member 29. The fixing is, for example, welding, adhesion, or the like. The stepped member 30 has a high step portion 31 that functions as a first pressing member, and low step portions 32 and 32 that function as second pressing members. Hereinafter, the high step portion 31 may be referred to as a first pressing member 31, and the low step portion 32 may be referred to as a second pressing member 32. The second pressing members 32, 32 are provided on both side portions of the first pressing member 31.

  The first pressing member 31 corresponds to the surface of the interposition member 22 (that is, the surface on the back side) between the pair of interposition convex portions 26 and 26 when viewed from the position. The second pressing members 32 and 32 correspond to the interposition convex portions 26 and 26 when viewed in position. The height H1 of the first pressing member 31 relative to the base shaft member 29 is greater than the height H2 of the second pressing member 32 relative to the base shaft member 29. That is, H1> H2.

  FIG. 5 shows the pressing unit 20 according to the arrow D in FIG. In FIG. 5, the angle α of the first pressing member 31 with respect to the base shaft member 29 is different from the angle β of the second pressing member 32 with respect to the base shaft member 29. Specifically, α> β. In FIG. 4, the portion of the base shaft member 29 to which the stepped member 30 is fixed is bent so as to protrude to the opposite side of the stepped member 30. By this bending, a third pressing member 36 is formed on the opposite side of the first pressing member 31 with respect to the base shaft member 29.

(Driver)
In FIG. 4, the drive device 21 drives the base shaft member 29 of the pressing unit 20. Specifically, the drive device 21 moves the base shaft member 29 about the virtual point P1 inside the casing 35 as indicated by an arrow EE ′. More specifically, when the base shaft member 29 is moved in the counterclockwise direction (E direction) when viewed from the direction of arrow D in FIG. 4, the first pressing member 31 and the second pressing member 32 as shown in FIG. Moves to the left in FIG. 5, that is, in the direction in which the interposition member 22 is pressed.

  On the other hand, when the base shaft member 29 is moved in the forward clockwise direction (E ′ direction) as viewed from the direction of arrow D in FIG. 4, the side opposite to the first pressing member 31 and the second pressing member 32 as shown in FIG. The third pressing member 36 is moved in the left direction in FIG. 6, that is, in the direction in which the interposed member 22 is pressed.

  The drive device 21 of FIG. 4 is not limited to the structure in which the base shaft member 29 is swung as described above, but may be configured to rotate the base shaft member 29 about its own axis (so-called shaft rotation). The structure of the drive device 21 for swinging and rotating the base shaft member 29 is not limited to a specific structure, and any structure can be adopted as necessary. For example, when rotating, the base shaft member 29 can be connected to the output shaft of an electric motor such as a motor capable of controlling the rotation angle, such as a pulse motor or a servo motor.

  On the other hand, when the base shaft member 29 is swung, for example, the base shaft member 29 is connected to a position eccentric from the center instead of the center of rotation of the gear, and then the gear is rotated by an electric motor. Conceivable.

(Appearance configuration)
In FIG. 2, a pad 40 is attached around the cushion frame 11 and the back frame 12. The pad 40 is made of an elastic material such as urethane foam. The pad 40 is a member that forms the overall appearance of the seat cushion 2 and the seat back 3. The pad 40 provides a seating feeling preferable to the seated person, for example, cushioning. The thickness of the pad 40 is several mm to several tens mm.

  The entire surface of the pad 40 is covered with an epidermis 41. The epidermis 41 is a part that is visually recognized or touched from the outside. The skin 41 is made of, for example, fabric, leather, synthetic leather, or the like. The skin 41 is preferably formed of a material having air permeability. The edge of the skin 41 is fixed to the cushion frame 11 and the back frame 12 by a hog ring or other fixing means.

  As shown in FIG. 7, the surface on the front side (left side in FIG. 7) of the interposition member 22 of the lumbar support device 19 is covered with a pad 40. The surface of the pad 40 is covered with an outer skin 41.

(Function)
Hereinafter, the operation of the lumbar support device of this embodiment will be described. First, in a normal state where the lumbar support device 19 of FIG. 2 is not operated, the pressing unit 20 is placed at a standby position indicated by a solid line in FIG. This state can be realized by setting the base shaft member 29 to the initial position by the driving device 21 in FIG. In this standby position, as shown in FIG. 7, the interposition member 22 is in contact with the first pressing member 31 (that is, the high step portion of the stepped member 30) while being suspended from the cushion spring 18.

  When an instruction to operate the lumbar support device 19 is received from the seated person, the drive device 21 swings the base shaft member 29 in the direction of arrow E (counterclockwise) in FIG. Then, the 1st pressing member 31 moves to the F direction of FIG. As a result, the first region A1 of the seat back 3 is pressed by the first pressing member 31 via the interposition member 22. As a result, the portion B1 (see FIG. 9) extending from the lumbar vertebra to the thoracic vertebra of the seated person is supported (ie, supported).

  Thereafter, the base shaft member 29 continues to swing further in the direction of arrow E for a predetermined time. When a predetermined time elapses, as shown in FIG. 8, the first pressing member 31 continues to press the interposing member 22, and the second pressing member 32 starts to hit the surface of the interposing convex portion 26 of the interposing member 22. As a result, the second region A2 of the seat back 3 starts to be pressed by the second pressing member 32 via the interposition member 22. Thus, both the first area A1 and the second area A2 are supported by the lumbar support device 19.

  In FIG. 4, if the amount of swing of the base shaft member 29 in the direction of arrow E is increased, the amount by which the first pressing member 31 and the second pressing member 32 press the interposition member 22 in FIG. The strength with which the device 19 supports the first region A1 and the second region A2 can be increased. In FIG. 4, if the swing position of the base shaft member 29 is stopped at an appropriate position, only the first region A1 is supported, both the first region A1 and the second region A2 are supported, or the first region A1 and the first region It is possible to increase the strength of support of the two regions A2.

  In the present embodiment, the curved surface of the surface of the intervening convex portion 26 corresponds to the trajectory of the movement of the second pressing member 32 according to the swing of the base shaft member 29. However, if necessary, the intervening convex portion 26 may be a flat surface that does not curve, or may be a curved surface having an arbitrary shape. Moreover, the intervening convex part 26 can also be made into shapes other than an inclined surface (namely, slope) depending on the case.

  In FIG. 4, when the drive device 21 swings the base shaft member 29 in the direction of the arrow E ′ (clockwise direction) (that is, when the pressing unit 20 is reversed), the third unit of the pressing unit 20 is indicated by the broken line in FIG. The pressing member 36 moves forward. As a result, only the second region A2 of the seat back 3 in FIG. 1 can be supported by the lumbar support device 19.

  In the present embodiment, in FIG. 4, the first pressing member 31 and the second pressing member 32 having different heights are provided inside the pressing unit 20, and the interposition member 22 is made to correspond to the second pressing member 32 having a lower height. An intervening convex portion 26 was provided on the surface of the substrate. As a result, both the first area A1 and the second area A2 of the seat back 3 can be simultaneously supported by merely swinging one pressing unit 20.

  Furthermore, in the present embodiment, as shown in FIG. 5, the angle α of the first pressing member 31 with respect to the base shaft member 29 and the angle β of the second pressing member 32 with respect to the base shaft member 29 are different. The timing at which the 32 hits the interposition convex portion 26 of the interposition member 22 can be adjusted to the timing desired by the designer. Therefore, both the first area A1 and the second area A2 of the seat back 3 can be reliably supported at a desired timing.

(Other embodiments)
The present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to the embodiments, and various modifications can be made within the scope of the invention described in the claims.

  For example, in the above embodiment, the present invention is applied to an automobile seat, but the present invention can be applied to any other vehicle.

  In FIG. 4, the driving device 21 may rotate the shaft instead of swinging the base shaft member 29.

  In addition, the interposition member 22 can be omitted by appropriately selecting the shapes of the first pressing member 31 and the second pressing member 32 in FIGS.

  Moreover, in FIG. 4, the 1st pressing member 31 and the 2nd pressing member 32 are not restricted to integral structure, It can also provide as a separate structure.

  1. 1. Vehicle seat, 2. seat cushion, Seat back, 4. 4. headrest, Base member, 6a, 6b. Holes, 7a7b. Struts, 11. Cushion frame, 12. Back frame, 13. Reclining mechanism, 14a. Right side frame, 14b. Left side frame, 15. Top frame, 18. Cushion spring, 19. Lumbar support device, 20. 21. pressing unit; 21. driving device (pressing member moving means) Intervening member, 25. Hook member, 26. Intervening protrusions, 29. Base shaft member, 30. Stepped member, 31. First pressing member (high stage portion), 32. 35. second pressing member (low stage portion) Casing, 36. Third pressing member, 40. Pad, 41. Epidermis, A1. 1st area | region, A2. Second region, B1. The part from the lumbar vertebra to the thoracic vertebra, B2. The part from the pelvis to the lumbar spine, E-E '. Swing direction, H1, H2. Height, P1. The center point of the swing, α, β. angle

Claims (10)

A lumbar support device used in a vehicle seat having a seat cushion for receiving a seated person's buttocks and a seat back for receiving a seated person's back,
A first pressing member that presses the first region of the seat back from the inside of the seat back;
A second pressing member that presses the second region of the seat back that is lower than the first region from the inside of the seat back;
The lumbar support device, wherein the second region of the seat back is pressed by the second pressing member simultaneously with the pressing of the first region of the seat back by the first pressing member.   The timing of pressing the first region of the seat back by the first pressing member and the timing of pressing the second region of the seat back by the second pressing member are performed only when either of them overlaps. The lumbar support device according to claim 1, wherein both of the times are included. An interposition member is provided inside the seat back,
The interposition member is provided across the first region and the second region,
The interposition member is movable so as to approach or move away from the surface receiving the seated person of the seat back,
A pressing member moving means for integrally moving the first pressing member and the second pressing member toward the interposition member;
At the same time as the first pressing member moved by the pressing member moving means presses the first region of the seat back via the interposition member, the second pressing member moved by the pressing member moving means is the interposition member. The lumbar support device according to claim 1, wherein the second region of the seat back is pressed through the lumbar. The interposition member is a plate-like member that does not easily deform,
The interposed member is suspended so as to be freely swingable at a position above the first region,
4. The lumbar support device according to claim 3, wherein the interposition member is movable so as to approach or move away from the surface of the seat back where the seated person is received. A base shaft member is provided,
A stepped member is provided on the base shaft member,
The stepped member has a high step portion and a low step portion,
The height of the high stage portion from the base shaft member is higher than the height of the low stage portion from the base shaft member,
The first pressing member is formed by the high step portion,
The second pressing member is formed by the low step portion,
The pressing member moving means directs the first pressing member and the second pressing member toward the interposition member by rotating the base shaft member about its own axis or by swinging the base shaft member. Move together,
An intervening convex portion is provided on a portion of the interposing member at a position corresponding to a low step portion of the stepped member;
A high step portion of the stepped member moved by the pressing member moving means abuts on the surface of the interposition member, and a low step portion moved by the pressing member moving means abuts on the interposition convex portion of the interposition member. 5. The lumbar support device according to claim 3, wherein the first pressing member and the second pressing member press the first region and the second region of the seat back simultaneously.   The lumbar support device according to claim 5, wherein an angle α of the first pressing member with respect to the base shaft member and an angle β of the second pressing member with respect to the base shaft member are different from each other. The interposition convex part is an inclined surface provided from a region corresponding to the first region to a region corresponding to the second region,
The lumbar support device according to claim 5 or 6, wherein the inclined surface is an inclined surface that is low on the first region side and high on the second region side.   The lumbar support device according to claim 7, wherein the inclined surface is a curved surface corresponding to a movement locus of the second pressing member. The first region of the seat back is a region corresponding to a portion from the lumbar vertebra to the thoracic vertebra of the seated person,
The lumbar support device according to any one of claims 1 to 8, wherein the second region of the seat back is a region corresponding to a portion from a seated person's pelvis to a lumbar spine.   A seat for a vehicle having a seat cushion for receiving a seated person's buttocks, a seat back for receiving the back of the seated person, and a lumbar support device for supporting a part of the back of the seated person. A lumbar support device according to any one of claims 1 to 9, wherein the vehicle seat.

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