Vehicle seat

Abstract

To provide a vehicle seat provided with a lumbar support member, which has a simple configuration and in which the lumbar support member can be easily pushed forward.SOLUTION: The vehicle seat 1 includes the seat cushion 2 and the seat back 3, the seat back 3 includes the seat back frame 6, the lumbar support member 17 supported by the seat back frame 6, the arm rest 9 supported by the seat back frame 6 so as to be rotatable between the use position and the storage position, and the rotating shaft member 16 that rotates together with the arm rest 9, and the rotating shaft member 16 includes the shaft portion 16A disposed behind the lumbar support member 17 and the pressing portion 16A protruding in the radial direction of the shaft portion 16B and capable of abutting on the rear surface of the lumbar support member 17. The pressing portion 16B pushes the lumbar support member 17 forward in accordance with the rotation of the arm rest 9.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat. [Background technology]

[0002] Vehicle seats have been known that have a lumbar support member that receives the load of a seated occupant and that can push the lumbar support member forward. For example, Patent Document 1 describes a vehicle seat that has a plate-shaped pressure-receiving member (lumbar support member) that receives the load of the seated occupant and a support member that pushes the pressure-receiving member forward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-104317 Summary of the Invention [Problem to be solved by the invention]

[0004] In the vehicle seat described in Patent Document 1, the support member includes a lower lift-up plate, an upper lift-up plate that moves up and down relative to the lower lift-up plate, and a flexible arch member whose upper end is fixed to the upper lift-up plate and whose lower end is fixed to the lower lift-up plate. By moving the upper lift-up plate toward the lower lift-up plate, the upper end of the arch member approaches the lower end of the arch member, causing the arch member to bend forward. As a result, the forward-bent arch member pushes the pressure-receiving member forward.

[0005] The vehicle seat described in Patent Document 1 includes a pressure-receiving member, a lower lift-up plate, an upper lift-up plate, an arch member, multiple stepping motors for moving the upper lift-up plate, and multiple screw shafts. Therefore, the vehicle seat described in Patent Document 1 has a complex configuration for pushing the lumbar support member forward. There is a demand for a vehicle seat with a simple configuration that makes it easy to push the lumbar support member forward.

[0006] In view of the above background, an object of the present invention is to provide a vehicle seat provided with a lumbar support member that has a simple configuration and in which the lumbar support member can be easily pushed forward. [Means for solving the problem]

[0007] In order to solve the above problem, one aspect of the present invention is a vehicle seat (1) comprising a seat cushion (3) and a seat back (4) supported by the seat cushion, wherein the seat back comprises a seat back frame (6), a lumbar support member (17) supported by the seat back frame, an armrest (9) supported by the seat back frame so as to be rotatable between an in-use position and a storage position, and a rotating shaft member (16) that rotates together with the armrest, wherein the rotating shaft member has a shaft portion (16A) arranged behind the lumbar support member and a pressing portion (16B) that protrudes radially from the shaft portion and can abut against the rear surface of the lumbar support member, and the pressing portion pushes the lumbar support member forward in response to the rotation of the armrest.

[0008] According to this aspect, the vehicle seat has an armrest and a rotating shaft member having a pressing portion. Then, by simply rotating the armrest, the pressing portion of the rotating shaft member pushes the lumbar support member forward. Therefore, it is possible to provide a vehicle seat provided with a lumbar support member that has a simple configuration and in which the lumbar support member can be easily pushed forward.

[0009] In the above aspect, the pressing portion may be formed of a plate cam (16C).

[0010] According to this aspect, the configuration of the pressing portion can be simplified.

[0011] In the above aspect, the plate cam has a protrusion (16D) that protrudes radially from the shaft portion, and when the armrest is in the use position, the protrusion protrudes further forward than when the armrest is in the storage position, pushing the lumbar support member forward.

[0012] According to this aspect, the protrusion can push the lumbar support member forward.

[0013] In the above aspect, the pressing portion may be a crank portion (16E) formed on the shaft portion.

[0014] According to this aspect, the configuration of the pressing portion can be simplified.

[0015] In the above aspect, the lumbar support member has a flexible support plate (21) and an elastic member (22) that connects the support plate to the seat back frame, and the pressing portion is preferably arranged behind the support plate.

[0016] According to this aspect, the support plate and the elastic member are pushed out by the pressing portion and can protrude forward while curving.

[0017] In the above aspect, the elastic member has left and right vertical portions extending vertically and connected at their upper and lower ends to the seat back frame, the left and right vertical portions being connected to the rear surface of the support plate, and the pressing portion being arranged so as to be able to abut against the left and right vertical portions.

[0018] According to this aspect, the support plate is not directly pressed against the pressing portion, and therefore stress is prevented from concentrating on a specific portion of the support plate, which can prevent the support plate from being damaged.

[0019] In the above aspect, when the armrest is in the use position, the pressing portion may protrude further forward from the shaft portion than when the armrest is in the storage position, thereby pushing the lumbar support member forward.

[0020] According to this aspect, the lumbar support member can be pushed forward appropriately.

[0021] In the above aspect, the seatback frame may have left and right side members extending vertically, and the shaft portion may extend horizontally and be rotatably supported by each of the left and right side members.

[0022] According to this aspect, it is possible to push the lumbar support member forward while keeping the position of the rotating shaft member constant.

[0023] In the above aspect, the axis of the shaft portion may be arranged coaxially with the rotation axis of the armrest.

[0024] According to this aspect, simply by connecting the shaft portion and the armrest, the shaft portion of the rotating shaft member can be rotated together with the armrest, which makes it easy to rotate the shaft portion of the rotating shaft member together with the armrest.

[0025] In the above aspect, the end of the shaft may be coupled to the armrest.

[0026] According to this aspect, the shaft portion of the rotating shaft member can be reliably rotated together with the armrest. [Effects of the Invention]

[0027] In order to solve the above problem, one aspect of the present invention is a vehicle seat (1) comprising a seat cushion (3) and a seat back (4) supported by the seat cushion, wherein the seat back comprises a seat back frame (6), a lumbar support member (17) supported by the seat back frame, an armrest (9) supported by the seat back frame so as to be rotatable between an in-use position and a storage position, and a rotating shaft member (16) that rotates together with the armrest, wherein the rotating shaft member has a shaft portion (16A) arranged behind the lumbar support member and a pressing portion (16B) that protrudes radially from the shaft portion and can abut against the rear surface of the lumbar support member, and the pressing portion pushes the lumbar support member forward in response to the rotation of the armrest.

[0028] According to this aspect, the vehicle seat has an armrest and a rotating shaft member having a pressing portion. Then, by simply rotating the armrest, the pressing portion of the rotating shaft member pushes the lumbar support member forward. Therefore, it is possible to provide a vehicle seat provided with a lumbar support member that has a simple configuration and in which the lumbar support member can be easily pushed forward.

[0029] In the above aspect, the pressing portion may be formed of a plate cam (16C).

[0030] According to this aspect, the configuration of the pressing portion can be simplified.

[0031] In the above aspect, the plate cam has a protrusion (16D) that protrudes radially from the shaft portion, and when the armrest is in the use position, the protrusion protrudes further forward than when the armrest is in the storage position, pushing the lumbar support member forward.

[0032] According to this aspect, the protrusion can push the lumbar support member forward.

[0033] In the above aspect, the pressing portion may be a crank portion (16E) formed on the shaft portion.

[0034] According to this aspect, the configuration of the pressing portion can be simplified.

[0035] In the above aspect, the lumbar support member has a flexible support plate (21) and an elastic member (22) that connects the support plate to the seat back frame, and the pressing portion is preferably arranged behind the support plate.

[0036] According to this aspect, the support plate and the elastic member are pushed out by the pressing portion and can protrude forward while curving.

[0037] In the above aspect, the elastic member has left and right vertical portions extending vertically and connected at their upper and lower ends to the seat back frame, the left and right vertical portions being connected to the rear surface of the support plate, and the pressing portion being arranged so as to be able to abut against the left and right vertical portions.

[0038] According to this aspect, the support plate is not directly pressed against the pressing portion, and therefore stress is prevented from concentrating on a specific portion of the support plate, which can prevent the support plate from being damaged.

[0039] In the above aspect, when the armrest is in the use position, the pressing portion may protrude further forward from the shaft portion than when the armrest is in the storage position, thereby pushing the lumbar support member forward.

[0040] According to this aspect, the lumbar support member can be pushed forward appropriately.

[0041] In the above aspect, the seatback frame may have left and right side members extending vertically, and the shaft portion may extend horizontally and be rotatably supported by each of the left and right side members.

[0042] According to this aspect, it is possible to push the lumbar support member forward while keeping the position of the rotating shaft member constant.

[0043] In the above aspect, the axis of the shaft portion may be arranged coaxially with the rotation axis of the armrest.

[0044] According to this aspect, simply by connecting the shaft portion and the armrest, the shaft portion of the rotating shaft member can be rotated together with the armrest, which makes it easy to rotate the shaft portion of the rotating shaft member together with the armrest.

[0045] In the above aspect, the end of the shaft may be coupled to the armrest.

[0046] According to this aspect, the shaft portion of the rotating shaft member can be reliably rotated together with the armrest. [Brief explanation of the drawings]

[0047] [Figure 1] 1 is a perspective view of a vehicle seat according to an embodiment, seen from diagonally front. [Figure 2] FIG. 2 is a perspective view of the vehicle seat as seen from diagonally behind. [Figure 3] FIG. [Figure 4] 4(A) is a longitudinal cross-sectional view of the seat back when the left and right armrests are in the storage position, and FIG. 4(B) is a longitudinal cross-sectional view of the seat back when the left and right armrests are in the use position. [Figure 5] Cross-sectional view of a seat back. [Figure 6] 1 is a perspective view of a vehicle seat as seen from diagonally behind when the seat back is in an upright position and the upper and lower tables are in the stowed positions; FIG. [Figure 7] FIG. 10 is a perspective view showing the state in which the seat back is in a storage position where it is folded forward, and the upper table and the lower table are in the use position. [Figure 8]FIG. 10 is a perspective view of a seat back frame 6 and an armrest 9 according to a first modified example. [Figure 9] 9A and 9B are longitudinal cross-sectional views of the seat back of variant 1, where FIG. 9A is a longitudinal cross-sectional view of the seat back when the left and right armrests are in the storage position, and FIG. 9B is a longitudinal cross-sectional view of the seat back when the left and right armrests are in the use position. [Figure 10] FIG. 10 is a cross-sectional view of a seat back according to a second modified example. [Figure 11] FIG. 11 is a cross-sectional view of a seat back according to a third modified example. [Figure 12] FIG. 11 is a perspective view of a vehicle seat according to a fourth modified example, seen from diagonally behind, when the seat back is in an upright position and the upper and lower tables are in their use positions. [Figure 13] FIG. 10 is a perspective view showing the state in which the seat back is in a storage position where it is folded forward, and the upper table and the lower table are in the use position. [Figure 14] FIG. 11 is a perspective view of a vehicle seat according to a fifth modified example, seen from diagonally behind, when the seat back is in an upright position and the upper and lower tables are in their use positions. [Figure 15] FIG. 10 is a perspective view showing the state in which the seat back is in a storage position where it is folded forward, and the upper table and the lower table are in the use position. [Figure 16] FIG. 13 is a cross-sectional view of a seat back according to a sixth modified example. [Figure 17] 17A and 17B are longitudinal cross-sectional views of the seat back of variant 6, where FIG. 17A is a longitudinal cross-sectional view of the seat back when the left and right armrests are in the storage position, and FIG. 17B is a longitudinal cross-sectional view of the seat back when the left and right armrests are in the use position. DETAILED DESCRIPTION OF THE INVENTION

[0048] Hereinafter, with reference to the drawings, an embodiment in which a vehicle seat 1 according to the present invention is applied to an automobile (vehicle) will be described. An automobile is one example of a vehicle, and the vehicle seat 1 may also be applied to vehicles such as an airplane or a ship. In the drawings and the following description, the front-rear direction, left-right direction, and up-down direction are directions defined based on the occupant seated in the vehicle seat 1. Furthermore, the inward direction of the seat (or the seat inner side) is the direction toward the center of the vehicle seat 1 in the left-right direction (also referred to as the seat width direction) when viewed from the front. The outward direction of the seat (or the seat outer side) is the direction away from the center of the vehicle seat 1 in the left-right direction.

[0049] <Configuration of vehicle seat 1> FIG. 1 is a perspective view of a vehicle seat 1 according to an embodiment, seen from diagonally front. FIG. 2 is a perspective view of the vehicle seat 1, seen from diagonally rear. As shown in FIGS. 1 and 2, the vehicle seat 1 is provided on a floor F of an automobile. The vehicle seat 1 has a seat cushion 2, a seat back 3, and a headrest 4.

[0050] The seat cushion 2 is mounted on the floor F and supports the buttocks of the occupant. The seat back 3 extends upward from the rear of the seat cushion 2 and supports the back of the occupant. The seat back 3 is supported by the seat cushion 2 so as to be rotatable between a storage position in which it is tilted forward and an upright position in which it is upright. The headrest 4 is mounted on the upper part of the seat back 3 and supports the head of the occupant.

[0051] The seat cushion 2 has a seat cushion frame (not shown) that forms the framework, a pad (not shown) that is supported by the seat cushion frame, and a skin material 2A that covers the surface of the pad.

[0052] The seat back 3 has a seat back frame 6 (see Figure 3) that forms the skeleton, a pad 7 (see Figure 5) supported by the seat back frame 6, a covering material 8 that covers the surface of the pad 7, left and right armrests 9, a backboard 10 attached to the rear of the seat back frame 6, and an upper table 11 and a lower table 12 attached to the backboard 10.

[0053] 3 is a perspective view of the seatback frame 6 and the armrest 9. In the following explanation, the seatback frame 6 will be described with the seatback 3 in the upright position. As shown in FIG. 3, the seatback frame 6 has left and right side members 6A extending vertically, an upper cross member 6B extending horizontally, a lower cross member 6C extending horizontally, a middle cross member 6D extending horizontally, and a rotary shaft member 16 extending horizontally and rotatably connected to the left and right side members 6A. The seatback frame 6 is provided with a lumbar support member 17 that supports the weight of a seated occupant.

[0054] The left and right side members 6A have their lower ends rotatably supported by a seat cushion frame (not shown), allowing the seat back 3 to rotate between a foldable storage position (see FIG. 7) in which it is folded forward and an upright position (see FIGS. 1 and 2).

[0055] The upper cross member 6B extends laterally and is connected to the upper ends of the left and right side members 6A. A headrest support member (not shown) that supports the headrest 4 is provided on the upper cross member 6B. The lower cross member 6C extends laterally and is connected to the lower ends of the left and right side members 6A. The middle cross member 6D extends laterally between the upper cross member 6B and the lower cross member 6C and is connected to the left and right side members 6A.

[0056] The rotating shaft member 16 extends laterally between the middle cross member 6D and the lower cross member 6C and is rotatably supported by each of the left and right side members 6A. The rotating shaft member 16 has a shaft portion 16A disposed behind the lumbar support member 17 and a pressing portion 16B that protrudes radially from the shaft portion 16A and can come into contact with the rear surface of the lumbar support member 17.

[0057] The shaft 16A extends to the left and right, and its left and right ends are rotatably supported by the left and right side members 6A, respectively. The left and right ends of the shaft 16A are coupled to the left and right armrests 9, respectively. This allows the left and right armrests 9 to rotate together with the rotating shaft member 16. Here, the axis of the shaft 16A is arranged coaxially with the rotation axis of the left and right armrests 9.

[0058] The pressing portion 16B is coupled to the shaft portion 16A and has two plate cams 16C spaced apart from each other. In other words, the pressing portion 16B is formed by two plate cams 16C. The two plate cams 16C have protrusions 16D that protrude radially from the shaft portion 16A. The plate cams 16C may be made of resin or metal.

[0059] The lumbar support member 17 has a flexible support plate 21 and an elastic member 22 that connects the support plate 21 to the seat back frame 6. The support plate 21 is made of resin. The support plate 21 may also be made of metal.

[0060] The elastic member 22 has left and right vertical portions 22A that extend vertically. Each of the left and right vertical portions 22A is supported at its upper end by the middle cross member 6D and at its lower end by the lower cross member 6C. Each of the left and right vertical portions 22A is also connected to the rear surface of the support plate 21. The elastic member 22 is made of a metal rod and has elasticity.

[0061] Two plate cams 16C of the pressing portion 16B are disposed behind the left and right vertical portions 22A, respectively. Each of the left and right vertical portions 22A can abut against the two plate cams 16C of the pressing portion 16B, respectively. In other words, the pressing portion 16B (two plate cams 16C) is disposed behind the support plate 21 so as to be able to abut against the rear surface of the support plate 21. Each of the two plate cams 16C of the pressing portion 16B is disposed so as to be able to abut against the left and right vertical portions 22A, respectively. The two plate cams 16C of the pressing portion 16B are part of the rotary shaft member 16. Therefore, the left and right armrests 9 rotate together with the two plate cams 16C (pressing portions 16B) of the rotary shaft member 16. The left and right armrests 9 are supported by the seatback frame 6 so as to be rotatable between the use position and the storage position.

[0062] FIG. 4 is a longitudinal cross-sectional view of the seat back 3. FIG. 4(A) is a longitudinal cross-sectional view of the seat back 3 when the left and right armrests 9 are in the storage position. FIG. 4(B) is a longitudinal cross-sectional view of the seat back 3 when the left and right armrests 9 are in the use position. The two plate cams 16C (pressing portions 16B) push the lumbar support member 17 forward in response to the rotation of the left and right armrests 9. The orientations of the two plate cams 16C are set so that the lumbar support member 17 is appropriately pushed out by the two plate cams 16C when the left and right armrests 9 are in the use position. That is, as shown in FIG. 4(A), the protrusions 16D of the two plate cams 16C are positioned so that they are spaced apart from the left and right armrests 9 when the left and right armrests 9 are in the storage position, and face forward to push out the left and right armrests 9 when the left and right armrests 9 are in the use position.

[0063] Therefore, when the left and right armrests 9 are in the use position, the protrusions 16D of the two plate cams 16C (pressing portions 16B) protrude further forward from the shafts 16A than when the left and right armrests 9 are in the storage position, and push the lumbar support member 17 forward. As a result, when the left and right armrests 9 are in the use position, the lumbar support member 17 is pushed forward and bent forward.

[0064] It should be noted that there are cases where the seat back 3 is rotated from the upright position to the stowed position when the seat back 3 is in the upright position and the left and right armrests 9 are in the used position. In this case, as the seat back 3 rotates from the upright position to the stowed position, the lumbar support member 17 moves rearward from its forward pushed-out position, and the left and right armrests 9 rotate from their used positions to their stowed positions. Therefore, when the seat back 3 is rotated from the upright position to the stowed position, the left and right armrests 9 automatically rotate from their used positions to their stowed positions. This makes it easy to rotate the left and right armrests 9 from their used positions to their stowed positions.

[0065] Fig. 5 is a cross-sectional view of the seat back 3. As shown in Figs. 3 and 5, the backboard 10 is attached to the rear of the seat back 3. As shown in Fig. 5, the backboard 10 has a case 26 supported on the seat back frame 6 via a skin material 8, and a magnetic plate 27 fitted into the case 26.

[0066] Case 26 has a bottom plate portion 26A whose faces face forward and backward, wall portions 26B whose faces face left and right and protrude rearward from the edges of bottom plate portion 26A, and an outer frame portion 26C whose faces face forward and backward and protrude outward from wall portions 26B. Case 26 is made of resin such as polypropylene.

[0067] The magnetic plate 27 has a plate-shaped main body plate portion 27A with its surfaces facing forward and backward. At least the rear surface of the main body plate portion 27A is painted with paint. At least the rear surface of the main body plate portion 27A of the magnetic plate 27 may be covered with a resin film, or a rubber mat may be attached. The film or rubber mat may be attached to the magnetic plate 27 using double-sided tape or adhesive. The main body plate portion 27A is formed from a ferromagnetic material such as iron, or a paramagnetic material (which attracts magnets).

[0068] As shown in FIG. 2, the upper table 11 is attached to the upper end of the backboard 10. The backboard 10 is provided with a support member (not shown) that is fixed to the upper end of the backboard 10 and rotatably supports the upper table 11. The upper table 11 is supported by the support member so that it can rotate between a use position and a folded position. Furthermore, when the upper table 11 is in the use position, the support member supports the upper table 11 so that its rotation is suppressed. An occupant of the vehicle can grasp the upper table 11 and rotate the upper table 11 between the use position and the folded position.

[0069] Upper table 11 is a plate made of a ferromagnetic material such as iron or a paramagnetic material (to which a magnet is attracted) with a painted surface. Upper table 11 may also be a plate made of a ferromagnetic material such as iron or a paramagnetic material (to which a magnet is attracted) with a resin film or rubber mat attached. Left and right magnets 11A (see FIG. 7) are embedded in the ends of upper table 11 (the ends opposite the support member).

[0070] As shown in FIG. 2, the lower table 12 is attached to the lower end of the backboard 10. The backboard 10 is provided with a support member (not shown) that is fixed to the lower end of the backboard 10 and rotatably supports the lower table 12. The lower table 12 is supported by the support member so that it can rotate between a use position and a folded position. Furthermore, when the lower table 12 is in the use position, the support member supports it so that its rotation is suppressed. An occupant of the vehicle can grasp the lower table 12 and rotate the lower table 12 between the use position and the folded position.

[0071] The lower table 12 has a similar configuration to the upper table 11. The lower table 12 is a plate made of a ferromagnetic material such as iron or a paramagnetic material (to which a magnet is attracted) with a painted surface. The lower table 12 may also be a plate made of a ferromagnetic material such as iron or a paramagnetic material (to which a magnet is attracted) with a resin film or rubber mat attached. Left and right magnets 12A are embedded in the ends of the lower table 12 (the ends opposite the support member).

[0072] 2 is a perspective view of the vehicle seat 1 when the seat back 3 is in an upright position and the upper table 11 and the lower table 12 are in their use positions. In the case shown in FIG. 3, an object (e.g., a bottled drink) can be placed on the upper table 11 and the lower table 12. Furthermore, in the state shown in FIG. 2, magnets are attached to the rear surface of the backboard 10, the rear surface of the upper table 11, and the rear surface of the lower table 12, so that a case or holder having a magnet can be attached to the rear surface of the backboard 10, the rear surface of the upper table 11, and the rear surface of the lower table 12.

[0073] 6 is a perspective view of the vehicle seat 1 seen from diagonally behind when the seat back 3 is in the upright position and the upper table 11 and the lower table 12 are in the stowed position. When the upper table 11 is in the stowed position, the left and right magnets 11A (see FIG. 5) of the upper table 11 are attracted to the magnetic plate 27 (see FIG. 5) of the backboard 10, thereby holding the upper table 11 in the stowed position. When the lower table 12 is in the stowed position, the left and right magnets 12A (see FIG. 2) of the lower table 12 are attracted to the magnetic plate 27, thereby holding the lower table 12 in the stowed position. Furthermore, in the state shown in FIG. 6, magnets are attracted to the rear surfaces of the upper table 11 and the lower table 12, so that cases or holders having magnets can be attracted to the rear surfaces of the upper table 11 and the lower table 12.

[0074] FIG. 7 is a perspective view showing a state in which the seat back 3 is in an upright position in which it is reclined forward, and the upper table 11 and the lower table 12 are in their use positions. When the seat back 3 is in the stowed position, luggage can be placed on the seat back 3. In the state shown in FIG. 7, luggage such as documents or a bag can be placed between the upper table 11 and the lower table 12. In this case, the upper table 11 and the lower table 12 prevent the luggage placed between the upper table 11 and the lower table 12 from falling forward or backward from above the seat back 3. Furthermore, in the state shown in FIG. 7, a magnet is attached to the upper surface of the backboard 10, so that a case or holder having a magnet can be attached to the upper surface of the backboard 10.

[0075] <Method for manufacturing vehicle seat 1> The manufacturing method for the vehicle seat 1 includes the following steps. The order of performing the following steps can be changed. A backboard preparation step of preparing the backboard 10. An upper table preparation step of preparing the upper table 11. A lower table preparation step of preparing the lower table 12. An upper table attachment step of attaching the upper table 11 to the backboard 10. A lower table attachment step of attaching the lower table 12 to the backboard 10. A backboard attachment step of attaching the backboard 10 to the seat back 3. These steps may be included in the step of preparing the seat back 3. A seat back preparation step of preparing the seat back 3. A seat cushion preparation step of preparing the seat cushion 2. A seat back assembly step of assembling the seat cushion 2 and the seat back 3. A vehicle seat attachment step of attaching the vehicle seat 1 to an automobile.

[0076] <Effects of Vehicle Seat 1> Next, the effects of the vehicle seat 1 will be described.

[0077] The rotating shaft member 16 has a pressing portion 16B, which pushes the lumbar support member 17 forward in response to the rotation of the left and right armrests 9. According to this configuration, the vehicle seat 1 has the left and right armrests 9 and the rotating shaft member 16 having the pressing portion 16B. Then, by simply rotating the left and right armrests 9, the lumbar support member 17 is pushed forward by the pressing portion 16B of the rotating shaft member 16. Therefore, it is possible to provide a vehicle seat 1 provided with the lumbar support member 17 that has a simple configuration and in which the lumbar support member 17 can be easily pushed forward.

[0078] The pressing portion 16B is formed by a plate cam 16C, which allows the configuration of the pressing portion 16B to be simplified.

[0079] When armrest 9 is in the use position, protrusion 16D of plate cam 16C protrudes further forward from shaft 16A than when armrest 9 is in the storage position, and pushes lumbar support member 17 forward. This allows protrusion 16D to push lumbar support member 17 forward.

[0080] The lumbar support member 17 has a flexible support plate 21 and an elastic member 22, and the pressing portion 16B (plate cam 16C) is disposed behind the support plate 21. As a result, the support plate 21 and the elastic member 22 are pushed out by the pressing portion 16B (plate cam 16C), and can protrude forward while curving.

[0081] The pressing portion 16B is arranged so as to be able to come into contact with the left and right vertical portions 22A. As a result, when the pressing portion 16B pushes the lumbar support member 17 forward, the pressing portion 16B presses the left and right vertical portions 22A forward, and the support plate 21 is pressed forward via the left and right vertical portions 22A. Therefore, since the support plate 21 is not directly pressed by the pressing portion 16B, stress concentration on a specific portion of the support plate 21 and damage to the support plate 21 can be suppressed.

[0082] When armrest 9 is in the use position, pressing portion 16B protrudes further forward from shaft portion 16A than when armrest 9 is in the storage position, and pushes lumbar support member 17 forward. This allows lumbar support member 17 to be pushed forward appropriately.

[0083] The shaft portion 16A of the rotating shaft member 16 extends to the left and right and is rotatably supported by each of the left and right side members 6A. This makes it possible to push the lumbar support member 17 forward while keeping the position of the rotating shaft member 16 constant.

[0084] The axis of the shaft portion 16A of the rotating shaft member 16 is arranged coaxially with the rotation axis of the armrest 9. As a result, simply by connecting the shaft portion 16A to the armrest 9, the shaft portion 16A of the rotating shaft member 16 can be rotated together with the armrest 9. Therefore, it is easy to rotate the shaft portion 16A of the rotating shaft member 16 together with the armrest 9.

[0085] The end of the shaft portion 16A is connected to the armrest 9. This allows the shaft portion 16A of the rotating shaft member 16 to rotate together with the armrest 9 reliably.

[0086] <Variation 1> The pressing portion 16B in the embodiment is two plate cams 16C. The pressing portion 16B in Modification 1 is a crank portion 16E formed on the shaft portion 16A. In the following explanations of Modifications 1 to 6, components that are the same as or similar to those in the vehicle seat 1 of the embodiment are given the same reference numerals, and duplicate detailed explanations will be omitted.

[0087] Fig. 8 is a perspective view of the seat back frame 6 and armrest 9 of Modified Example 1. As shown in Fig. 8, the shaft 16A of Modified Example 1 is provided with two crank portions 16E as the pressing portions 16B. Each of the two crank portions 16E is arranged so as to be able to abut against the left and right vertical portions 22A, respectively. The shaft 16A and the crank portion 16E may be formed by bending a shaft or a pipe. Alternatively, the shaft 16A and the crank portion 16E may be manufactured by welding.

[0088] FIG. 9 is a longitudinal cross-sectional view of the seat back 3 of Modified Example 1. FIG. 9(A) is a longitudinal cross-sectional view of the seat back 3 when the left and right armrests 9 are in the storage position. FIG. 9(B) is a longitudinal cross-sectional view of the seat back 3 when the left and right armrests 9 are in the use position. The left and right armrests 9 rotate together with the two crank portions 16E of the rotating shaft member 16. The orientations of the two crank portions 16E are set so that the lumbar support member 17 is appropriately pushed out by the two crank portions 16E when the left and right armrests 9 are in the use position. That is, as shown in FIG. 9(A), the two crank portions 16E are formed so that they are spaced apart from the left and right armrests 9 when the left and right armrests 9 are in the storage position, and face forward to push out the left and right armrests 9 when the left and right armrests 9 are in the use position.

[0089] Therefore, when the left and right armrests 9 are in the use position, the two crank portions 16E protrude further forward from the shaft portions 16A than when the left and right armrests 9 are in the storage position, pushing the lumbar support member 17 forward. As a result, when the left and right armrests 9 are in the use position, the lumbar support member 17 is pushed forward and bent forward.

[0090] In the vehicle seat 1 of the first modification, the pressing portion 16B is a crank portion 16E formed on the shaft portion 16A, which allows the configuration of the pressing portion 16B to be simplified.

[0091] <Variation 2> FIG. 10 is a cross-sectional view of a seat back 3 of Modified Example 2. The case 26 of the backboard 10 of Modified Example 2 has an inner frame portion 26D in addition to the case 26 of the backboard 10 of the embodiment. That is, as shown in FIG. 10, the case 26 of the backboard 10 of Modified Example 2 has a bottom plate portion 26A whose faces face forward and backward, wall portions 26B protruding rearward from the edges of the bottom plate portion 26A, outer frame portions 26C protruding outward from the walls 26B, and inner frame portions 26D protruding inward from the ends of the walls 26B. By having the inner frame portion 26D in addition to the case 26 of the backboard 10 of the embodiment, the case 26 of Modified Example 2 can prevent the magnetic material plate 27 from detaching from the case 26.

[0092] <Variation 3> 11 is a cross-sectional view of the seat back 3 of Modified Example 3. In the case 26 of the backboard 10 of Modified Example 3, grooves 26E that open to the rear are formed on the left and right ends of the bottom plate portion 26A whose surfaces face forward and backward, and the left and right ends of the magnetic material plate 27 are bent forward and fitted into the grooves 26E. As a result, the left and right ends of the magnetic material plate 27 are not exposed on the surface (rear surface) of the backboard 10, which makes the appearance of the backboard 10 more pleasing.

[0093] <Variation 4> FIG. 12 is a perspective view of the vehicle seat 1, seen from diagonally behind, when the seat back 3 of Modified Example 4 is in an upright position and the upper table 11 and lower table 12 are in their use positions. Modified Example 4 has a support member (not shown) fixed to the middle of the backboard 10 in the height direction, which rotatably supports the upper table 11. While the upper table 11 of the embodiment opens and closes from below, the upper table 11 of Modified Example 4 opens and closes from above. In addition, the left part of the upper table 11 has a hole 11B through which a plastic bottle can be inserted. When a plastic bottle is inserted into hole 11B, hole 11B prevents the plastic bottle from coming off the lower table 12.

[0094] 13 is a perspective view showing the state in which the seat back 3 is in the storage position where it is tilted forward, and the upper table 11 and the lower table 12 are in the use position. When the seat back 3 is in the storage position, the space in front of the seat back 3 is wider, so larger luggage can be placed in front of the seat back 3.

[0095] <Variation 5> FIG. 14 is a perspective view of the vehicle seat 1 of Modified Example 5, seen from diagonally behind, when the seat back 3 is in an upright position and the upper table 11 and lower table 12 are in their use positions. Modified Example 5 has a support member (not shown) fixed to the middle of the backboard 10 in the height direction, which rotatably supports the lower table 12. While the lower table 12 of the embodiment opens and closes from above, the lower table 12 of Modified Example 5 opens and closes from below. In addition, the left side of the upper table 11 has a hole 11B through which a plastic bottle can be inserted. When a plastic bottle is inserted into hole 11B, hole 11B prevents the plastic bottle from coming off the lower table 12.

[0096] 15 is a perspective view showing the state in which the seat back 3 is in the storage position where it is tilted forward, and the upper table 11 and the lower table 12 are in the use position. When the seat back 3 is in the storage position, the space behind the seat back 3 is wider, so larger luggage can be placed behind the seat back 3.

[0097] <Variation 6> The vehicle seat 1 of the sixth modified example differs from the vehicle seat 1 of the embodiment in the configuration of the support plate 21 and the left and right positions of the pressing portion 16B (plate cam 16C).

[0098] Figure 16 is a cross-sectional view of the seat back 3 of Modified Example 6. As shown in Figure 16, Modified Example 6 has three pressing portions 16B (plate cams 16C). Furthermore, the pressing portions 16B (plate cams 16C) are not disposed behind the left and right vertical portions 22A so that the pressing portions 16B (plate cams 16C) do not come into contact with the left and right vertical portions 22A.

[0099] Figure 17 is a vertical cross-sectional view of the seat back 3 of Modified Example 6. Figure 17(A) is a vertical cross-sectional view of the seat back 3 when the left and right armrests 9 are in the storage position. Figure 17(B) is a vertical cross-sectional view of the seat back 3 when the left and right armrests 9 are in the use position.

[0100] The support plate 21 of the sixth modification is connected to the elastic member 22 (vertical portion 22A) at the upper end portion, and is not connected to the elastic member 22 (vertical portion 22A) at any portion other than the upper end portion. When the support plate 21 is pressed by the pressing portion 16B (plate cam 16C), the lower portion of the support plate 21 moves away from the elastic member 22 (vertical portion 22A).

[0101] When the left and right armrests 9 are in the use position (see FIG. 17(A)), the protrusions 16D of the three plate cams 16C (pressing portions 16B) protrude further forward from the shafts 16A than when the left and right armrests 9 are in the storage position (see FIG. 17(B)), and push the support plate 21 (lumbar support member 17) forward. As a result, when the left and right armrests 9 are in the use position, the support plate 21 (lumbar support member 17) is pushed forward.

[0102] Although the description of the specific embodiment has been completed above, the present invention is not limited to the above embodiment and can be widely modified and implemented. For example, in the embodiment, the number of pressing portions 16B (plate cams 16C) can be changed. In the embodiment, the pressing portions 16B (plate cams 16C) do not have to be arranged behind the left and right vertical portions 22A, and the pressing portions 16B (plate cams 16C) do not have to abut against the left and right vertical portions 22A. In this case, the pressing portions 16B press the support plate 21. The configuration of the fourth or fifth modification may be combined with the rotating shaft member 16 of the second modification. The number of pressing portions 16B (crank portions 16E) of the second modification can be changed. The crank portions 16E of the second modification do not have to be arranged behind the vertical portions 22A, and the crank portions 16E do not have to abut against the left and right vertical portions 22A. The support plate 21 of variant 6, which is connected to the elastic member 22 (vertical portion 22A) at the upper end and is not connected to the elastic member 22 (vertical portion 22A) at any other point than the upper end, may be applied to the support plate 21 of variant 2. [Explanation of symbols]

[0103] 1: Vehicle seats 2: Seat cushion 3: Seat back 6: Seat back frame 9: Armrest 16: Rotating shaft member 16A:Shaft part 16B: Pressing part 16C: Plate cam 16D:Protrusion 16E: Crank section 17: Lumbar support member 21: Support plate 22: Elastic member 22A: Vertical section

Claims

1. A vehicle seat, Seat cushion and a seat back supported by the seat cushion, The seat back is A seat back frame, a lumbar support member supported by the seat back frame; an armrest supported by the seat back frame so as to be rotatable between an in-use position and a stowed position; a rotating shaft member that rotates together with the armrest, the rotating shaft member has a shaft portion disposed behind the lumbar support member and a pressing portion protruding in a radial direction of the shaft portion and capable of contacting a rear surface of the lumbar support member, The pressing portion pushes the lumbar support member forward in response to rotation of the armrest.

2. 2. The vehicle seat according to claim 1, wherein the pressing portion is formed by a plate cam.

3. the plate cam has a protruding portion that protrudes in the radial direction of the shaft portion, 3. The vehicle seat according to claim 2, wherein when the armrest is in the use position, the protruding portion protrudes further forward than when the armrest is in the storage position, and pushes the lumbar support member forward.

4. 2. The vehicle seat according to claim 1, wherein the pressing portion is a crank portion formed on the shaft portion.

5. The lumbar support member has a flexible support plate and an elastic member that connects the support plate to the seat back frame, The vehicle seat according to claim 1 , wherein the pressing portion is disposed rearward of the support plate.

6. The elastic member has left and right vertical portions that extend vertically and are connected to the seat back frame at their upper and lower ends, The left and right vertical portions are coupled to the rear surface of the support plate, The vehicle seat according to claim 5 , wherein the pressing portions are arranged so as to be able to come into contact with the left and right vertical portions.

7. 2. The vehicle seat according to claim 1, wherein when the armrest is in the use position, the pressing portion protrudes forward from the shaft portion more than when the armrest is in the storage position, thereby pushing the lumbar support member forward.

8. The seat back frame has left and right side members extending vertically, 2. The vehicle seat according to claim 1, wherein the shaft portion extends laterally and is rotatably supported by each of the left and right side members.

9. The vehicle seat according to claim 8, wherein an axis of the shaft portion is arranged coaxially with a rotation axis of the armrest.

10. 2. The vehicle seat of claim 1, wherein an end of the pivot is coupled to the armrest.

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