Vehicle seat

Abstract

To provide a vehicle seat which can situationally change a seating feeling feld by an occupant.SOLUTION: A vehicle seat S includes: a seat back 1 for supporting a back part of an occupant; and a seat cushion 2 for supporting a hip of the occupant. A seat frame 4 forming a framework of the seat back 1 has: an inner back frame 11 having a seating surface for supporting the occupant; and an outer back frame 12 supporting the inner back frame 11. The seating surface of the inner back frame 11 has: a first seating surface 1a to allow the occupant to be seated; and a second seating surface which is an opposite surface of the first seating surface 1a and allows the occupant to be seated. The inner back frame 11 is attached to the outer back frame 12 in a manner that allows switching between the first seating surface 1a and the second seating surface whose surface state is different from that of the first seating surface 1a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat including a seat back that supports the back of an occupant and a seat cushion that supports the buttocks of the occupant. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there is known a vehicle seat in which the seating direction can be changed between front and rear by sliding the seat back in the front-rear direction relative to the seat cushion. For example, Patent Document 1 discloses a vehicle seat in which the seating direction can be changed between front and rear, and the seat back can be inverted relative to the seat cushion to adjust the seating surface to the seating direction.

[0003] Furthermore, Patent Document 2 discloses that the vehicle seat can change its seating direction between front and rear, and furthermore, the inner frame that holds the seating surface of the seat back can be inverted relative to the outer frame to align the seating surface with the seating direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 58-143731 [Patent Document 2] Japanese Utility Model Application Publication No. 58-004426 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the vehicle seats described in Patent Documents 1 and 2, the seating surface of the seat back is inverted to match the seating direction, so the underside of the seating surface is not used as a seating surface, and therefore it is not possible to change the seating comfort of the occupant sitting in the vehicle seat.

[0006] An object of the present invention is to provide a vehicle seat that allows the occupant's seating comfort to be changed depending on the situation. [Means for solving the problem]

[0007] The above problem is solved by the vehicle seat of the present invention, which provides a vehicle seat including a seat back that supports the back of an occupant and a seat cushion that supports the buttocks of the occupant, wherein a seat frame that forms the framework of at least one of the seat back and the seat cushion includes a first frame having a seating surface that supports the occupant, and a second frame that supports the first frame, the seating surface of the first frame including a first seating surface on which the occupant sits and a second seating surface opposite to the first seating surface and on which the occupant sits, and the first frame is attached to the second frame in a manner that allows switching between the first seating surface and the second seating surface, the second seating surface having a surface condition different from that of the first seating surface. With the above-described configuration, the first and second seating surfaces on which an occupant can sit and which have different surface conditions are provided, and the seating comfort of the occupant can be changed by reversing the seating surfaces. Therefore, the seating comfort of the occupant can be changed depending on the situation.

[0008] In this case, the first frame may be an inner frame arranged inside the second frame, and the second frame may be an outer frame that supports the inner frame so that the seating surface can be switched between the first seating surface and the second seating surface. With the above-described configuration, the inner frame is supported by the outer frame disposed on the outside, thereby improving the strength of the seat frame.

[0009] In this case, the seat frame has a switching member that supports the inner frame rotatably relative to the outer frame, and the switching member is provided in the center of the extension direction of the inner frame and has a rotation axis that extends in the seat width direction, and the rotation axis switches between the first seating surface and the second seating surface. With the above-described configuration, the first seating surface and the second seating surface can be easily switched by rotating the inner frame relative to the outer frame. Also, by reversing the seating surface using the rotation shaft extending in the seat width direction, the thickness of the inner frame can be made compact.

[0010] In this case, the seat frame is a back frame that forms the skeleton of the seat back, and the inner frame preferably has a first pressure-receiving member that supports the occupant from behind, and a second pressure-receiving member that is located at a different position in the vertical direction from the first pressure-receiving member, has a different elastic force from the first pressure-receiving member, and supports the occupant from behind. With the above-described configuration, pressure-receiving members with different elastic forces are provided in the vertical direction, so that the seating feel can be further changed when the seating surface is inverted.

[0011] In this case, the seat frame is a cushion frame that forms the skeleton of the seat cushion, and the inner frame preferably has a first pressure-receiving member that supports the occupant from below, and a second pressure-receiving member that is located at a different position in the fore-and-aft direction from the first pressure-receiving member, has a different elastic force from the first pressure-receiving member, and supports the occupant from below. With the above-described configuration, pressure-receiving members with different elastic forces are provided in the front-rear direction, so that the seating comfort can be further changed when the seating surface is inverted.

[0012] In this case, one of the first pressure-receiving member and the second pressure-receiving member may have a wave shape extending in the seat width direction and may include a spring member that is bridged across the inside of the inner frame to support the occupant. With the above-described configuration, one of the pressure-receiving members is a compact wave-shaped spring member, thereby enabling space saving while providing suitable support for the occupant.

[0013] In this case, one of the first pressure-receiving member and the second pressure-receiving member may have an elastic spring that is spanned across the inside of the inner frame, and a plate-shaped member that is attached to the elastic spring and supports the occupant. With the above-described configuration, by making one of the pressure-receiving members a plate-like member, it is possible to improve the support force for the occupant.

[0014] In this case, when the first seating surface faces the occupant, the first pressure-receiving member is positioned lower than the second pressure-receiving member to support the occupant's waist from behind, and when the second seating surface faces the occupant, the second pressure-receiving member is positioned lower than the first pressure-receiving member to support the occupant's waist from behind. With the above-described configuration, the area around the lumbar region of the occupant can be supported at all times when the inner frame is inverted.

[0015] In this case, when the first seating surface faces the occupant, the second pressure-receiving member is positioned rearward of the first pressure-receiving member to support the occupant's buttocks from below, and when the second seating surface faces the occupant, the first pressure-receiving member is positioned rearward of the second pressure-receiving member to support the occupant's buttocks from below. With the above-described configuration, the area around the buttocks of the occupant can be supported at all times when the inner frame is inverted.

[0016] In this case, the switching member has a rotation locking device that locks the rotation of the inner frame relative to the outer frame, and the rotation locking device locks the rotation of the inner frame relative to the outer frame when the extension direction of the inner frame and the extension direction of the outer frame are the same direction. With the above-described configuration, rotation is locked when the seating surface of the inner frame is flush with the surface of the outer frame, so that the seating surface can be fixed in a suitable position.

[0017] In this case, the vehicle seats are arranged in multiple rows in the width direction of the vehicle, the switching member is provided on the outer surface of the seat frame in the seat width direction, and has an operating lever for unlocking the rotation lock device, and the operating lever is preferably provided on the outer surface on the inside in the width direction of the vehicle. With the above configuration, the provision of the operating lever makes it easier to switch between the first seating surface and the second seating surface. In addition, by providing the operating lever on the inside (between multiple vehicle seats), it is possible to prevent the occupant from operating it inadvertently.

[0018] In this case, the vehicle seat is provided with a reclining device that rotatably connects the seat back to the seat cushion and restricts the rotation of the seat back relative to the seat cushion, and a reclining operation lever that releases the rotation restriction of the reclining device, and the switching member has an operation lever that releases the lock of the rotation lock device, and the operation lever and the reclining operation lever are preferably provided on different sides of the seat frame in the seat width direction. With the above configuration, the operation lever can be provided to more easily switch between the first and second seating surfaces. In addition, the operation lever is provided on a different side from the reclining operation lever, which can prevent the occupant from operating it erroneously.

[0019] In this case, the vehicle seat has a padding material placed on the inner frame of the seat frame and a skin material covering the padding material, and the design surface of the skin material may be different between the first seating surface and the second seating surface. With the above configuration, the first seating surface and the second seating surface have different design surfaces, so that the inverted state can be confirmed simply by visually checking the first seating surface and the second seating surface.

[0020] In this case, the vehicle seat preferably has a padding material disposed on the inner frame of the seat frame, and the hardness of the padding material may differ between the first seating surface and the second seating surface. With the above-described configuration, the hardness of the padding material of the first seating surface and the second seating surface is different, so that the seating comfort of the occupant can be further varied.

[0021] In this case, the vehicle seat has a padding material arranged on the inner frame of the seat frame, the padding material having a support portion that supports the occupant, and a bank portion that is arranged outside the support portion in the seat width direction, bulges from the support portion toward the occupant, and supports the occupant from the side, and the amount of bulging of the bank portion of the padding material may differ between the first seating surface and the second seating surface. With the above-described configuration, the amount of expansion of the bank portions of the first seating surface and the second seating surface differs, so that the seating comfort of the occupant can be further varied.

[0022] In this case, the seat frame is a back frame that forms the skeleton of the seat back, and the vehicle seat has a padding material placed on the inner frame of the back frame, and the thickness of the lower portion of the padding material is different between the first seating surface and the second seating surface. With the above-described configuration, the thickness of the lower portion of the padding material of the first seating surface and the second seating surface differs, so that the seating comfort of the occupant can be further varied.

[0023] In this case, the seat frame is a cushion frame that forms the skeleton of the seat cushion, and the vehicle seat has a padding material that is placed on the inner frame of the cushion frame, and the thickness of the rear portion of the padding material is different between the first seating surface and the second seating surface. With the above-described configuration, the thickness of the rear portion of the padding material of the first seating surface and the second seating surface is different, so that the seating comfort of the occupant can be further varied.

[0024] In this case, the vehicle seat has a padding material placed on the inner frame of the seat frame and a skin material covering the padding material, and the surface friction coefficient of the skin material may be different between the first seating surface and the second seating surface. With the above-described configuration, the surface friction coefficients of the first seating surface and the second seating surface are different, which further changes the seating comfort of the occupant.

[0025] In this case, the vehicle seat may be provided with a headrest that supports the occupant's head from behind, and the headrest may have a headrest pillar that is integrally formed with the outer frame of the seat back, and a padding material that is placed on the headrest pillar. With the above-described configuration, the outer frame of the seat back and the headrest pillar are integrated, thereby increasing the rigidity of the seat frame. [Effects of the Invention]

[0026] According to the present invention, it is possible to realize a vehicle seat that allows the occupant's seating comfort to be changed depending on the situation. Furthermore, according to the present invention, the strength of the seat frame can be improved. Furthermore, according to the present invention, it is possible to easily switch between the first seating surface and the second seating surface, and the thickness of the inner frame can be made compact. Furthermore, according to the present invention, the seating comfort can be further changed when the seating surface is inverted. Furthermore, according to the present invention, it is possible to save space while providing suitable support for the occupant. Furthermore, according to the present invention, the support force for the occupant can be improved. Furthermore, according to the present invention, the lumbar region of the occupant can be supported at all times. Furthermore, according to the present invention, the area around the buttocks of the occupant can be supported at all times. Furthermore, according to the present invention, the seating surface can be fixed at a suitable position. Furthermore, according to the present invention, it is possible to more easily switch between the first seating surface and the second seating surface, and it is also possible to prevent the occupant from operating the switch inadvertently. Furthermore, according to the present invention, it is possible to more easily switch between the first seating surface and the second seating surface, and it is also possible to prevent erroneous operation by the occupant. Furthermore, according to the present invention, the inverted state can be confirmed simply by visually checking the first seating surface and the second seating surface. Furthermore, according to the present invention, the seating comfort of the occupant can be further changed. Furthermore, according to the present invention, the rigidity of the seat frame can be increased. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a perspective view of a vehicle seat according to an embodiment of the present invention, showing a seating surface in a normal state; [Figure 2] 1 is a perspective view of a vehicle seat showing the seating surface in a switched state. [Figure 3] 1 is a side view of a vehicle seat showing the seating surface in a normal state. [Figure 4] 1 is a side view of the vehicle seat showing the seating surface in a switched state. [Figure 5] FIG. [Figure 6] FIG. 2 is a diagram illustrating the position of an operating lever in a vehicle seat. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the following description, the "front-rear direction" refers to the front-rear direction of the vehicle seat, which is the direction that coincides with the direction of travel when the vehicle is traveling. The "seat width direction" refers to the width direction of the vehicle seat, which is the direction that coincides with the left-right direction as seen by an occupant seated in the vehicle seat. The "up-down direction" refers to the up-down direction of the vehicle, which is the direction that coincides with the vertical direction when the vehicle is traveling on a horizontal plane.

[0029] <Overall sheet configuration> As shown in Fig. 1, the vehicle seat S of this embodiment is a seat that is placed on a vehicle body floor and in which a vehicle occupant sits. In this embodiment, the vehicle seat S is used as a front seat that corresponds to the front seats of a vehicle. However, the vehicle seat S is not limited to this, and may also be a rear seat of a vehicle, or may be used as a middle seat in the second row or a rear seat in the third row in a vehicle that has three rows of seats in the front-to-rear direction.

[0030] As shown in FIG. 1, the vehicle seat S is mainly composed of a seat back 1, a seat cushion 2 connected to the lower part of the seat back 1, and a headrest 3 connected to the upper part of the seat back 1. The seat back 1 is a backrest portion that supports the back of an occupant from behind, and is provided with a seat frame 4 (back frame 10) inside the seat back 1, which serves as a framework. The seat cushion 2 is a seating portion that supports the occupant from below, and is provided with a seat frame 4 (cushion frame 20) inside the seat cushion, which serves as a framework. The headrest 3 is a head portion that supports the occupant's head from behind, and is provided with a seat frame 4 (headrest pillar 30) that serves as a framework inside the headrest 3.

[0031] As shown in FIG. 1, the vehicle seat S includes a reclining device 5 that rotates the seat back 1 relative to the seat cushion 2, and a reclining operation lever 6 that releases the rotation restriction of the reclining device 5. The occupant can unlock the locked state of the reclining device 5 by manually operating the reclining operation lever 6. Note that the reclining device 5 is not limited to a configuration in which it is manually operated by the reclining operation lever 6, and may be configured so that the seat back 1 is rotated relative to the seat cushion 2 by the driving force of a driving source.

[0032] The reclining device 5 is a device that rotatably connects the seat back 1 to the seat cushion 2 and is also capable of locking the seat back 1. Specifically, the reclining device 5 switches the seat back 1 between a normal position and a rearward tilted position in which the seat back 1 is tilted backward so as to be away from the seat cushion 2. The reclining device 5 may also switch the seat back 1 from the normal position to a forward tilted position in which the seat back 1 is tilted forward so as to be closer to the seat cushion 2.

[0033] The reclining operation lever 6 is an operation part for releasing the restriction on rotation of the reclining device 5, and is provided on the right side surface of the seat cushion 2. Specifically, the occupant can operate the reclining operation lever 6 to set the reclining device 5 to an unlocked state and tilt the seatback 1 backward to the desired angle. When the rearward tilt angle reaches the desired angle, the occupant releases the reclining operation lever 6, and the reclining device 5 returns to the locked state.

[0034] As shown in Figs. 1 to 4, the vehicle seat S is configured so that the seating surfaces of the seat back 1 and the seat cushion 2 can be reversed. More specifically, as shown in Figs. 1 and 3, the vehicle seat S is in a normal state in which the first seating surface 1a of the seat back 1 faces the occupant (front side) and the third seating surface 2a of the seat cushion 2 faces the occupant (upper side). As shown in Figs. 2 and 4, the vehicle seat S is in a switched state in which the second seating surface 1b of the seat back 1 faces the occupant (front side) and the fourth seating surface 2b of the seat cushion 2 faces the occupant (upper side). In the switched state, the occupant can be given a seating comfort similar to that of a sports car, for example. Also, in the switched state, the holding feeling can be enhanced to improve support stability. Note that the switched state may be a state other than the sports car state, or may be a state that is more relaxing than the normal state.

[0035] <Seat frame> The seat frame 4 forms the framework of the seat back 1, the seat cushion 2, and the headrest 3. Specifically, as shown in FIG. 5 , the seat frame 4 includes a back frame 10 that forms the framework of the seat back 1, a cushion frame 20 that forms the framework of the seat cushion 2, and a headrest pillar 30 of the headrest 3. FIG. 5 shows the seat frame 4 of the vehicle seat S in a normal state.

[0036] <Back frame> The back frame 10 has an inner back frame 11 (first frame, inner frame) having a seating surface that supports an occupant, an outer back frame 12 (second frame, outer frame) that supports the inner back frame 11, and a switching member 13 that supports the inner back frame 11 rotatably relative to the outer back frame 12.

[0037] The seating surface of the seat back 1 (the seating surface of the inner back frame 11) has a first seating surface 1a on which the occupant sits and a second seating surface 1b on the opposite side of the first seating surface 1a on which the occupant sits. The inner back frame 11 is attached to the outer back frame 12 so as to be switchable between a first seating surface 1a and a second seating surface 1b.

[0038] 1 and 5, the seat back 1 is configured by placing a pad material P1 on an inner back frame 11 and covering it with a skin material T1. In other words, the pad material P1 and the skin material T1 of the inner back frame 11 form the seating surface of the seat back 1. The seat back 1 is configured by placing a padding material P2 on the outer back frame 12 and covering it with a skin material T2. The padding material P2 is formed to be thinner than the padding material P1. Note that the outer back frame 12 does not necessarily need to be provided with the padding material P2 or the skin material T2.

[0039] <Inner back frame> The padding material P1 of the inner back frame 11 has a support portion P1a that supports the occupant from behind, and a bank portion P1b that is positioned outside the support portion P1a in the seat width direction, bulges out from the support portion P1a toward the occupant, and supports the occupant from the side. Specifically, when the vehicle seat S is in the normal state (FIGS. 1 and 3), the bank portion P1b has a front bank portion P1b1 that bulges forward from the support portion P1a and a back bank portion P1b2 that bulges rearward from the support portion P1a. In other words, when the vehicle seat S is in the switched state (FIGS. 2 and 4), the front bank portion P1b1 faces rearward and the back bank portion P1b2 bulges forward from the support portion P1a.

[0040] 1 and 2, the first seating surface 1a and the second seating surface 1b have different surface conditions. Here, different surface conditions of the seating surfaces means different appearances and physical properties such as the shape and hardness of the padding material P1, the design surface (pattern, color, material) of the covering material T2, and the elasticity of the pressure-receiving member (described later). In other words, the first seating surface 1a and the second seating surface 1b provide different seating comfort to the occupant.

[0041] For example, when the vehicle seat S is in the switching state (FIGS. 2 and 4), the amount of expansion of the bank portion P1b of the padding P1 differs between the first seating surface 1a and the second seating surface 1b compared to when the vehicle seat S is in the normal state (FIGS. 1 and 3). Specifically, the amount of expansion (height H2) of the back bank portion P1b2 is greater than the amount of expansion (height H1) of the front bank portion P1b1. Therefore, when the vehicle seat S is in the switching state, the back bank portion P1b2 with a greater amount of expansion supports the occupant from the sides, providing the occupant with a seating comfort similar to that of a sports car.

[0042] Furthermore, for example, when the vehicle seat S is in the switching state (FIGS. 2 and 4), the hardness of the padding P1 differs between the first seating surface 1a and the second seating surface 1b compared to when the vehicle seat S is in the normal state (FIGS. 1 and 3). More specifically, the hardness of the padding P1 of the second seating surface 1b is higher than that of the first seating surface 1a. Therefore, by configuring the seating surface to be harder when the vehicle seat S is in the switching state, it is possible to provide the occupant with a seating comfort similar to that of a sports car.

[0043] Furthermore, for example, when the vehicle seat S is in the switching state (FIGS. 2 and 4), the thickness of the lower portion of the padding P1 differs between the first seating surface 1a and the second seating surface 1b compared to when the vehicle seat S is in the normal state (FIGS. 1 and 3). More specifically, the thickness (length L2) of the lower portion of the padding P1 of the second seating surface 1b is thicker than the thickness (length L1) of the lower portion of the padding P1 of the first seating surface 1a. Therefore, by configuring the seating surface to be thicker when the vehicle seat S is in the switching state, it is possible to provide the occupant with a seating comfort similar to that of a sports car.

[0044] Furthermore, for example, when the vehicle seat S is in the switching state (FIGS. 2 and 4), the surface friction coefficient of the upholstery material T1 differs between the first seating surface 1a and the second seating surface 1b compared to when the vehicle seat S is in the normal state (FIGS. 1 and 3). More specifically, the upholstery material T1 of the second seating surface 1b is made of a material with a high surface friction coefficient, such as Alcantara, or perforated leather, while the upholstery material T1 of the first seating surface 1a is made of a material with a low surface friction coefficient, such as fabric or genuine leather. Therefore, by configuring the vehicle seat S so that the surface friction coefficient is high when the vehicle seat S is in the switching state, it is possible to provide the occupant with a seating comfort similar to that of a sports car.

[0045] Furthermore, for example, when the vehicle seat S is in the switching state (FIGS. 2 and 4), the design surface of the upholstery material T1 is different between the first seating surface 1a and the second seating surface 1b compared to when the vehicle seat S is in the normal state (FIGS. 1 and 3). More specifically, the color and pattern of the upholstery material T1 of the first seating surface 1a and the second seating surface 1b are different from each other. Therefore, the occupant can confirm whether the vehicle seat S is in the normal state or the switching state simply by visually checking the seating surfaces.

[0046] As shown in FIG. 5, the inner back frame 11 is a frame-shaped frame and includes left and right back side frames 14 provided on both sides in the seat width direction, an upper frame 15 connecting the upper ends of the left and right back side frames 14, and a lower frame 16 connecting the lower ends of the left and right back side frames 14. The inner back frame 11 also has a spring member 17 (first pressure-receiving member) that supports the occupant from the rear, and a pressure-receiving plate 18 (second pressure-receiving member) that is located at a different position in the vertical direction from the spring member 17 and has a different elastic force than the spring member 17.

[0047] As shown in Fig. 5, a pair of back side frames 14 are provided on the left and right. The left and right back side frames 14 are each a plate-like member that is long in the vertical direction, and have a shape in which the upper end portion and the lower end portion bulge out in the front-rear direction more than the central portion in the vertical direction. A rotation shaft 13a of a switching member 13 (described later) is attached to the center in the vertical direction of the back side frame 14. A plurality of attachment holes 14a for attaching spring members 17 are formed in the lower end portion of the back side frame 14.

[0048] 5, the upper frame 15 is a long rod-shaped member extending in the seat width direction. The upper frame 15 is attached to the upper ends of the back side frames 14 so as to connect the left and right back side frames 14 together. A locking portion 18d of a pressure-receiving plate 18, which will be described later, is locked to the center of the upper frame 15 in the seat width direction.

[0049] 5, the lower frame 16 is a long rod-shaped member extending in the seat width direction. The lower frame 16 is attached to the lower end of the back side frame 14 so as to connect the left and right back side frames 14 together. The inner back frame 11 is configured in a frame shape by the left and right back side frames 14, the upper frame 15, and the lower frame 16, so that the rigidity of the back frame 10 can be increased.

[0050] As shown in FIG. 5, the spring member 17 is disposed on the lower side inside the inner back frame 11. Specifically, the spring member 17 is two S springs 17a having a wave shape extending in the seat width direction, stretched across the inside of the inner back frame 11, and supporting the occupant from behind. The S springs 17a are formed to bend multiple times in the up-down direction and extend long in the left-right direction, and have a predetermined elastic force. The left-right ends of the S springs 17a are inserted into the mounting holes 14a of the back side frames 14, so that the S springs 17a are stretched across the back side frames 14. The number of S springs 17a is not limited to two, and may be one, three, or more. In this way, by supporting the occupant with the S-spring 17a, it is possible to achieve space saving while providing suitable support.

[0051] 5, the pressure plate 18 is disposed on the upper side inside the inner back frame 11. Specifically, the pressure plate 18 has an elastic spring 18a that spans the inside of the inner back frame 11, and a plate-like member 18b that is attached to the elastic spring 18a and supports the occupant.

[0052] The elastic spring 18a is an elastic member that is spanned inside the inner back frame 11, and has an extension portion 18c that is located in the center of the seat width direction and extends in the vertical direction, a locking portion 18d that is located at the upper end of the extension portion 18c and is used to lock onto the upper frame 15, and an inclined portion 18e that extends at an angle from the lower end of the extension portion 18c toward the outside in the seat width direction. The engaging portion 18d is attached to the upper frame 15, and the outer end of the inclined portion 18e is inserted into the engaging hole 14b of the back side frame 14, so that the elastic spring 18a is suspended inside the inner back frame 11.

[0053] The plate-like member 18b is a plate-like member attached to the extension portion 18c of the elastic spring 18a, and supports the occupant from behind. By adopting such a planar support structure, the support force for supporting the occupant can be improved.

[0054] The occupant is supported from behind by the spring member 17 and the pressure plate 18. More specifically, in the normal state shown in FIG. 3, the occupant's waist is supported from behind by the spring member 17. The occupant's back is supported from behind by the pressure plate 18. In the switched state shown in FIG. 4, the occupant's waist is supported from behind by the pressure plate 18. The occupant's back is supported from behind by the spring member 17.

[0055] In addition, in the normal state, the spring member 17 is disposed forward of the pressure-receiving plate 18, so the occupant is mainly supported by the spring member 17, which has a relatively large elastic force. In the switching state, the pressure-receiving plate 18 is disposed forward of the spring member 17, so the occupant is mainly supported by the pressure-receiving plate 18, which has a relatively small elastic force. In the normal state, the occupant may be supported only by the spring member 17. In the switched state, the occupant may be supported only by the pressure plate 18.

[0056] In this way, by providing pressure-receiving members with different elastic forces at different positions in the extending direction (vertical direction) of the inner back frame 11, it is possible to provide the occupant with different seating sensations when the inner back frame 11 is turned over to switch between the first seating surface 1a and the second seating surface 1b. Furthermore, when the inner back frame 11 is turned over, the occupant's waist area can always be supported. In particular, when the vehicle seat S is in the switched state, the pressure plate 18, which has a small elastic force (large support force), is configured to support the occupant's lower back, thereby providing the occupant with a seating comfort similar to that of a sports car. In the normal state, the spring member 17 may be disposed above the pressure plate 18.

[0057] <External back frame> 5, the outer back frame 12 is a frame-shaped frame formed by bending a pipe member. The outer back frame 12 has left and right back side portions 12a provided on both sides in the seat width direction, an upper connecting portion 12b connecting to the headrest pillar 30, a lower connecting portion 12c extending inward in the seat width direction from the lower end portions of the left and right back side portions 12a to connect the left and right back side portions 12a, and a frame connecting portion 12d connecting to the cushion frame 20 via the reclining device 5.

[0058] The back side portions 12a are each a portion that extends elongatedly in the vertical direction, as shown in Fig. 5. A rotation shaft 13a of the switching member 13, which will be described later, is attached to the central portion of the back side portion 12a in the vertical direction. The upper connecting portions 12b extend inward in the seat width direction from the upper ends of the left and right back side portions 12a and are connected to the lower ends of the headrest pillars 30.

[0059] As shown in FIG. 5, the lower connecting portion 12c is a portion that extends longitudinally in the seat width direction and connects the lower ends of the left and right back side portions 12a. The frame connecting portion 12d is provided at the lower end of the back side portion 12a, and is a portion that connects to the cushion frame 20 via the reclining device 5. The outer back frame 12 is configured in a frame shape by the left and right back side portions 12a, the upper connecting portion 12b, and the lower connecting portion 12c, so that the rigidity of the back frame 10 can be increased.

[0060] <Switching member> The switching member 13 is a member that supports the inner back frame 11 rotatably relative to the outer back frame 12. As shown in Fig. 5, the switching member 13 has a rotation shaft 13a provided in the center of the inner back frame 11 in the extension direction, a rotation lock device 13b that locks the rotation of the inner back frame 11 relative to the outer back frame 12, and an operation lever 13c that unlocks the rotation lock device 13b.

[0061] The rotation shaft 13a is a long rod-shaped member extending in the seat width direction, and serves as an axis for rotating the inner back frame 11 relative to the outer back frame 12. Specifically, the rotation shaft 13a is fixed to the vertical center of the left and right back side frames 14. The rotation shaft 13a is inserted into shaft holes formed in the vertical center of the left and right back side portions 12a, and is rotatably supported.

[0062] The switching member 13 switches between the first seating surface 1a and the second seating surface 1b using the rotation shaft 13a. In this embodiment, the thickness of the lower and upper portions of the back side frame 14 is increased to improve the support force around the occupant's lower back in both the normal state and the switching state. Because the axial direction of the rotation shaft 13a is configured to extend along the seat width direction, the thickness of the back side frame 14 around the occupant's lower back can be made more compact than in a case where the axial direction of the rotation shaft 13a is configured to extend along the up-down direction.

[0063] The rotation lock device 13b is a device for locking the rotation of the inner back frame 11 relative to the outer back frame 12, and is provided on the outer side in the seat width direction of the left back side portion 12a. The rotation locking device 13b locks the rotation of the inner back frame 11 relative to the outer back frame 12 when the extending direction of the inner back frame 11 and the extending direction of the outer back frame 12 are the same. In other words, when the first seating surface 1a or the second seating surface 1b faces the seated person (front side), the rotation locking device 13b locks the rotation of the inner back frame 11 relative to the outer back frame 12.

[0064] The operating lever 13c is an operating portion for unlocking the rotation lock device 13b, and is provided on the left side surface of the seat back 1 (on the outer surface of the seat frame 4). The occupant operates the operation lever 13c to switch the vehicle seat S between a normal state (FIGS. 1 and 3) and a switching state (FIGS. 2 and 4). Specifically, by operating the operation lever 13c, the occupant can set the rotation lock device 13b to an unlocked state and invert the first seating surface 1a or the second seating surface 1b. Then, when the occupant has inverted the first seating surface 1a or the second seating surface 1b and released the operation lever 13c, the rotation lock device 13b returns to the locked state.

[0065] In this way, by reversing the first seating surface 1a and the second seating surface 1b of the seat back 1, the state of the vehicle seat S can be switched between the normal state and the switching state. Therefore, the seating comfort of the occupant can be changed depending on the situation. In this embodiment, the seating surface is inverted about the rotation shaft 13a extending in the left-right direction to switch the state of the vehicle seat S between the normal state and the switching state, but the switching of the vehicle seat S is not limited to this. For example, the seating surface may be inverted along a rotation shaft extending in the up-down direction. Also, for example, without using a rotation shaft, the inner back frame 11 may be detachably attached to the outer back frame 12 so that the front and back can be reversed.

[0066] <Cushion frame> The cushion frame 20 has an inner cushion frame 21 (first frame, inner frame) having a seating surface that supports an occupant, an outer cushion frame 22 (second frame, outer frame) that supports the inner cushion frame 21, and a second switching member 23 (switching member) that supports the inner cushion frame 21 rotatably relative to the outer cushion frame 22. Note that the description of the same configuration as the back frame 10 will be omitted.

[0067] The seating surface of the seat cushion 2 (the seating surface of the inner cushion frame 21) has a third seating surface 2a on which the occupant sits and a fourth seating surface 2b on the opposite side of the third seating surface 2a, on which the occupant also sits. The inner cushion frame 21 is attached to the outer cushion frame 22 so as to be switchable between the third seating surface 2a and the fourth seating surface 2b.

[0068] 1 and 5, the seat cushion 2 is configured by placing a pad material P3 on an inner cushion frame 21 and covering it with a skin material T3. In other words, the pad material P3 and the skin material T3 of the inner cushion frame 21 form the seating surface of the seat cushion 2. The seat cushion 2 is configured by placing a padding material P4 on the outer cushion frame 22 and covering it with a skin material T4. The padding material P4 is formed to be thinner than the padding material P3. Note that the outer cushion frame 22 does not necessarily need to be provided with the padding material P4 or the skin material T4.

[0069] <Inner cushion frame> The pad material P3 of the inner cushion frame 21 has a support portion P3a that supports the occupant from below, and a bank portion P3b that is arranged outside the support portion P3a in the seat width direction, bulges from the support portion P3a toward the occupant, and supports the occupant from the side. Specifically, when the vehicle seat S is in the normal state (FIGS. 1 and 3), the bank portion P3b has a front bank portion P3b1 that bulges upward from the support portion P3a and a back bank portion P3b2 that bulges downward from the support portion P3a. In other words, when the vehicle seat S is in the switched state (FIGS. 2 and 4), the front bank portion P3b1 faces downward, and the back bank portion P3b2 bulges upward from the support portion P3a.

[0070] 1 and 2, the third seating surface 2a and the fourth seating surface 2b have different surface conditions. Here, different surface conditions of the seating surfaces means different appearances and physical properties such as the shape and hardness of the padding material P3, the design surface (pattern, color, material) of the covering material T3, and the elasticity of the pressure-receiving member (described later). In other words, the third seating surface 2a and the fourth seating surface 2b provide different seating comfort to the occupant. The description of the same configuration as the first seating surface 1a and the second seating surface 1b of the seat back 1 will be omitted.

[0071] For example, when the vehicle seat S is in the switching state (FIGS. 2 and 4), the thickness of the rear portion of the padding P3 is different between the third seating surface 2a and the fourth seating surface 2b compared to when the vehicle seat S is in the normal state (FIGS. 1 and 3). More specifically, the thickness (length L4) of the rear portion of the padding P3 of the fourth seating surface 2b is thicker than the thickness (length L3) of the rear portion of the padding P3 of the third seating surface 2a. Therefore, by configuring the seating surface to be thicker when the vehicle seat S is in the switching state, it is possible to provide the occupant with a seating comfort similar to that of a sports car.

[0072] As shown in FIG. 5, the inner cushion frame 21 is a frame-shaped frame and includes left and right cushion side frames 24 provided on both sides in the seat width direction, a rear frame 25 connecting the rear ends of the left and right cushion side frames 24, and a front frame 26 connecting the front ends of the left and right cushion side frames 24. The inner cushion frame 21 also has a second spring member 27 (first pressure-receiving member) that supports the occupant's buttocks from below in the switching state, a second pressure-receiving plate 28 (second pressure-receiving member) that is provided at a different position in the fore-and-aft direction from the second spring member 27 and has a different elastic force from the second spring member 27, and that supports the occupant's buttocks from below in the normal state, and a pan frame 29 that supports the occupant's thighs from below.

[0073] As shown in Fig. 5, a pair of cushion side frames 24 are provided on the left and right. Each of the left and right cushion side frames 24 is a plate-like member that is long in the front-to-rear direction, and has a shape in which the rear end portion and the front end portion bulge out in the up-down direction more than the center portion in the front-to-rear direction. A second rotation shaft 23a of the second switching member 23 (described later) is attached to the center in the front-rear direction of the cushion side frame 24. A plurality of second mounting holes 24a for mounting second spring members 27 are formed in the front end portion of the cushion side frame 24.

[0074] 5, the rear frame 25 is a long rod-shaped member extending in the seat width direction. The rear frame 25 is attached to the rear ends of the cushion side frames 24 so as to connect the left and right cushion side frames 24 together. A locking portion 28d of a second pressure-receiving plate 28, which will be described later, is locked to the center portion of the rear frame 25 in the seat width direction.

[0075] The front frame 26 is a long rod-shaped member extending in the seat width direction, as shown in Fig. 5. The front frame 26 is attached to the front ends of the cushion side frames 24 so as to connect the left and right cushion side frames 24 together. The inner cushion frame 21 is configured in a frame shape by the left and right cushion side frames 24, the rear frame 25, and the front frame 26, and therefore the rigidity of the cushion frame 20 can be increased.

[0076] As shown in FIG. 5 , the second spring member 27 is disposed on the front side inside the inner cushion frame 21. Specifically, the second spring member 27 is two S springs 27a that have a wave shape extending in the seat width direction and are stretched across the inner cushion frame 21 to support the occupant from below. The S springs 27a are formed to bend multiple times in the front-rear direction and extend elongatedly in the left-right direction, and have a predetermined elastic force. The left-right ends of the S springs 27a are inserted into second mounting holes 24a of the cushion side frame 24, whereby the S springs 27a are stretched across the cushion side frame 24. The number of S springs 27a is not limited to two, and may be one, three, or more. In this way, by supporting the occupant's buttocks with the S spring 27a in the switched state, it is possible to achieve space saving while providing suitable support.

[0077] 5, the second pressure-receiving plate 28 is disposed on the rear side inside the inner cushion frame 21. Specifically, the second pressure-receiving plate 28 has an elastic spring 28a that spans the inside of the inner cushion frame 21, and a plate-like member 28b that is attached to the elastic spring 28a and supports the occupant.

[0078] The elastic spring 28a is an elastic member that is spanned across the inside of the inner cushion frame 21, and is provided in the center of the seat width direction. It has an extending portion 28c that extends in the front-to-rear direction, a locking portion 28d that is provided at the rear end of the extending portion 28c and is used to lock onto the rear frame 25, and an inclined portion 28e that extends at an angle from the front end of the extending portion 28c toward the outside in the seat width direction. The engaging portion 28d is attached to the rear frame 25, and the outer end of the inclined portion 28e is inserted into the second engaging hole 24b of the cushion side frame 24, so that the elastic spring 28a is suspended across the inside of the inner cushion frame 21.

[0079] The plate-like member 28b is a plate-like member attached to the extension portion 28c of the elastic spring 28a, and supports the buttocks of the occupant from below in the normal state. By adopting such a planar support structure, the support force for supporting the occupant can be improved.

[0080] As shown in FIG. 5, the pan frame 29 is a plate-shaped frame that connects the left and right cushion side frames 24 and supports the thighs of the occupant from below. The pan frame 29 has a first pan frame 29a arranged above the front portions of the left and right cushion side frames 24, and a second pan frame 29b arranged below the rear portions of the left and right cushion side frames 24. By providing the pan frame 29, it is possible to improve the support force for the thighs of the occupant. It is also possible to further increase the rigidity of the inner cushion frame 21. Furthermore, it is possible to prevent the submarine phenomenon, in which the occupant sinks when the vehicle receives an external impact.

[0081] As shown in FIG. 5, the first pan frame 29a is attached to flanges formed on the upper sides of the front portions of the left and right cushion side frames 24, and supports the thighs of the occupant in a normal state. The second pan frame 29b is attached to flanges formed on the lower sides of the rear portions of the left and right cushion side frames 24, and supports the thighs of the occupant in the switched state. It is noted that only one of the first pan frame 29a and the second pan frame 29b may be provided, or the pan frame 29 may not be provided. When the pan frame 29 is not provided, the thighs of the occupant are supported by the second spring member 27 or the second pressure plate 28.

[0082] The occupant is supported from below by the second spring member 27, the second pressure plate 28, and the pan frame 29. More specifically, in the normal state shown in FIG. 3, the occupant's buttocks are supported from below by the second pressure plate 28. The occupant's thighs are supported from below by the first pan frame 29a. In the switched state shown in FIG. 5, the occupant's buttocks are supported from below by the second spring member 27. The occupant's thighs are supported from below by the second pan frame 29b.

[0083] In this way, by providing pressure-receiving members with different elastic forces at different positions in the extending direction (front-rear direction) of the inner cushion frame 21, it is possible to provide the occupant with different seating sensations when the inner cushion frame 21 is turned over to switch between the third seating surface 2a and the fourth seating surface 2b. Furthermore, when the inner cushion frame 21 is turned over, the area around the occupant's buttocks can always be supported. In particular, when the vehicle seat S is in the switched state, the second spring member 27, which has a large elastic force (small resistance force), is configured to support the occupant's buttocks, thereby providing the occupant with a seating comfort similar to that of a sports car. In the normal state, the second spring member 27 may be disposed rearward of the second pressure-receiving plate 28, and the occupant's buttocks may be supported by the second spring member 27. In the switching state, the second pressure-receiving plate 28 may be disposed rearward of the second spring member 27, and the occupant's buttocks may be supported by the second pressure-receiving plate 28.

[0084] <Outer cushion frame> As shown in Fig. 5, the outer cushion frame 22 is a frame-shaped frame. The outer cushion frame 22 has left and right cushion side portions 22a provided on both sides in the seat width direction, a rear connecting portion 22b connecting the rear ends of the left and right cushion side portions 22a, and a front connecting portion 22c connecting the front ends of the left and right cushion side portions 22a. The reclining device 5 is provided inside the cushion side portions 22a.

[0085] The cushion side portions 22a are each a plate-shaped member that extends elongatedly in the front-rear direction, as shown in Fig. 5. A second rotation shaft 23a of the second switching member 23, which will be described later, is attached to the center portion of the cushion side portion 22a in the front-rear direction. The rear connecting portion 22b is a rod-shaped member extending in the seat width direction, and is a portion that connects the rear end portions of the left and right cushion side portions 22a.

[0086] As shown in FIG. 5, the front connecting portion 22c is a portion that extends elongately in the seat width direction and connects the front end portions of the left and right cushion side portions 22a. The outer cushion frame 22 is configured in a frame shape by the left and right cushion side portions 22a, the rear connecting portion 22b, and the front connecting portion 22c, and therefore the rigidity of the cushion frame 20 can be increased.

[0087] <Second switching member> The second switching member 23 is a member that supports the inner cushion frame 21 rotatably relative to the outer cushion frame 22. As shown in Fig. 5 , the second switching member 23 has a second rotation shaft 23a provided in the center of the inner cushion frame 21 in the extension direction, a second rotation locking device 23b that locks the rotation of the inner cushion frame 21 relative to the outer cushion frame 22, and a second operating lever 23c that unlocks the second rotation locking device 23b. Note that the description of the same configuration as the switching member 13 of the seat back 1 will be omitted.

[0088] The second rotation shaft 23 a is a long rod-shaped member extending in the seat width direction, and serves as an axis for rotating the inner cushion frame 21 relative to the outer cushion frame 22 . The second switching member 23 switches between the third seating surface 2a and the fourth seating surface 2b by means of a second rotation shaft 23a.

[0089] The second rotation lock device 23b is a device for locking the rotation of the inner cushion frame 21 relative to the outer cushion frame 22, and is provided on the outer side in the seat width direction of the left cushion side portion 22a. The second operating lever 23c is an operating portion for unlocking the second rotation locking device 23b, and is provided on the left side surface of the seat cushion 2.

[0090] In this way, the seating comfort of the occupant can be changed by inverting the third seating surface 2a and the fourth seating surface 2b of the seat cushion 2. Therefore, the seating comfort of the occupant can be changed depending on the situation.

[0091] As shown in Fig. 6, a plurality of vehicle seats S may be arranged side by side in the width direction of the vehicle. Specifically, two vehicle seats S (a right vehicle seat S1 and a left vehicle seat S2) are arranged in the vehicle. Note that Fig. 6 shows the right vehicle seat S1 in a normal state and the left vehicle seat S2 in a switched state. Here, the operating lever 13c of the right vehicle seat S1 is disposed on the left side of the back frame 10 (inner side in the width direction of the vehicle). The operating lever 13c of the left vehicle seat S2 is disposed on the outer surface of the right side of the back frame 10 (inner side in the width direction of the vehicle). Here, the second operating lever 23c of the right vehicle seat S1 is disposed on the outer surface of the left side of the cushion frame 20 (inner side in the width direction of the vehicle). The second operating lever 23c of the left vehicle seat S2 is disposed on the right side of the cushion frame 20 (inner side in the width direction of the vehicle). In this way, by providing the operation lever 13c and the second operation lever 23c on the inner side (between the plurality of vehicle seats S), it is possible to prevent the occupant from operating them inadvertently.

[0092] 6, the reclining operation lever 6 of the right vehicle seat S1 is disposed on the outer surface of the right side (outside in the width direction of the vehicle) of the cushion frame 20. The reclining operation lever 6 of the left vehicle seat S2 is disposed on the outer surface of the left side (outside in the width direction of the vehicle) of the cushion frame 20. Therefore, the operation lever 13c, the second operation lever 23c, and the reclining operation lever 6 are provided on different outer surfaces of the seat frame 4 in the seat width direction. In this way, by providing the operation lever 13c and the second operation lever 23c on a different side from the reclining operation lever 6, it is possible to prevent the occupant from operating the seat by mistake.

[0093] In this embodiment, the seating surfaces of the seat back 1 and the seat cushion 2 are each inverted to switch the state of the vehicle seat S between the normal state and the switching state, but it may also be configured so that only the seating surface of the seat back 1 is inverted. Also, it may also be configured so that only the seating surface of the seat cushion 2 is inverted.

[0094] <Headrest pillar> The headrest pillar 30 is a frame that supports the head of an occupant from behind. The headrest pillar 30 is provided above the back frame 10 and is formed integrally with the upper connecting portion 12b. 1 and 5, the headrest 3 is configured by placing a padding material P5 on a headrest pillar 30 and covering it with a skin material T5. Since the outer back frame 12 of the back frame 10 and the headrest pillar 30 are integrated, the rigidity of the seat frame 4 can be increased. Note that the skin material T2 of the outer back frame 12 of the seat back 1 and the skin material T5 of the headrest 3 may be formed integrally.

[0095] <Manufacturing method> A method for manufacturing the vehicle seat S will be described. First, the inner back frame 11, the outer back frame 12, and the switching member 13 are prepared. Then, the inner back frame 11 is rotatably connected to the outer back frame 12 via the switching member 13, and the back frame 10 is assembled. Note that the headrest pillar 30 is formed integrally with the outer back frame 12. Additionally, the inner cushion frame 21, the outer cushion frame 22, and the second switching member 23 are prepared. Then, the inner cushion frame 21 is rotatably connected to the outer cushion frame 22 via the second switching member 23, and the cushion frame 20 is assembled.

[0096] Next, the spring member 17 and the pressure-receiving plate 18 are placed inside the inner back frame 11. Furthermore, the second spring member 27 and the second pressure-receiving plate 28 are placed inside the inner cushion frame 21. Furthermore, the pan frames 29 are placed in the front and rear portions of the left and right cushion side frames 24.

[0097] Then, the assembled back frame 10, the assembled cushion frame 20, and the reclining device 5 are prepared. Then, the seat back 1 is rotatably connected to the seat cushion 2 via the reclining device 5. At this time, the reclining operation lever 6 of the reclining device 5 is disposed on the side opposite in the seat width direction to the side on which the operation lever 13c of the switching member 13 and the second operation lever 23c of the second switching member 23 are provided.

[0098] Then, a pad material P1 is placed on the inner back frame 11, and a pad material P2 is placed on the outer back frame 12. Furthermore, a pad material P3 is placed on the inner cushion frame 21, and a pad material P4 is placed on the outer cushion frame 22. Furthermore, a pad material P5 is placed on the headrest pillar 30. Furthermore, the inner back frame 11 and the padding P1 are covered with the skin T1, and the outer back frame 12 and the padding P2 are covered with the skin T2. At this time, the headrest pillar 30 and the padding P5 are covered with the skin T5 integrated with the skin T2. Furthermore, the inner cushion frame 21 and the padding P3 are covered with the skin T3, and the outer cushion frame 22 and the padding P4 are covered with the skin T4.

[0099] At this time, the inner back frame 11 is attached to the outer back frame 12 so as to be switchable between a first seating surface 1a and a second seating surface 1b having a surface condition different from that of the first seating surface 1a. Also, the inner cushion frame 21 is attached to the outer cushion frame 22 so as to be switchable between a third seating surface 2a and a fourth seating surface 2b having a surface condition different from that of the third seating surface 2a.

[0100] The manufacturing method of the vehicle seat S described above includes preparing a first frame having a first seating surface for an occupant to sit on and a second seating surface opposite the first seating surface for the occupant to sit on, preparing a second frame supporting the first frame, and attaching the first frame to the second frame so as to be switchable between the first seating surface and the second seating surface having a surface condition different from that of the first seating surface. By using the above manufacturing method, it is possible to manufacture a vehicle seat S that allows the occupant's seating comfort to be changed depending on the situation.

[0101] In the above embodiment, a vehicle seat used in an automobile was described as a specific example, but the present invention is not limited to this and can be used for various types of seats, such as two-wheeled vehicle seats, vehicle seats for trains and buses, vehicle seats for airplanes and ships, as well as office chairs for work, wheelchairs, and child seats in shopping carts.

[0102] In this embodiment, the vehicle seat according to the present invention has been mainly described. However, the above embodiment is merely an example for facilitating understanding of the present invention, and does not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and the present invention naturally includes equivalents thereof. [Explanation of symbols]

[0103] S Vehicle seat S1 Right vehicle seat S2 Left vehicle seat 1 seat back 1a First seating surface 1b Second seating surface 2 seat cushions 2a Third seating surface (first seating surface) 2b Fourth seating surface (second seating surface) 3 Headrest 4 seat frame 5 Reclining device 6 Reclining control lever 10 Back Frame 11 Inner back frame (first frame, inner frame) 12 Outer back frame (second frame, outer frame) 12a Backside 12b Upper connection part 12c Lower connection part 12d Frame connection 13 Switching member 13a Rotation axis 13b Rotation lock device 13c Operating lever 14 Backside Frame 14a Mounting hole 14b Locking hole 15 Upper frame 16 Lower frame 17 Spring member (first pressure-receiving member) 17a S spring 18 Pressure plate (second pressure member) 18a Elastic spring 18b Plate-shaped member 18c extension 18d Locking part 18e Slope 20 Cushion Frame 21 Inner cushion frame (first frame, inner frame) 22 Outer cushion frame (second frame, outer frame) 22a Cushion side part 22b Rear connection part 22c Front connection 23 Second switching member (switching member) 23a Second rotation axis (rotation axis) 23b Second rotation lock device (rotation lock device) 23c Second operating lever (operating lever) 24 Cushion side frame 24a Second mounting hole 24b Second locking hole 25 Rear frame 26 Front Frame 27 Second spring member (first pressure-receiving member) 27a S spring 28 Second pressure plate (second pressure member) 28a Elastic spring 28b Plate-shaped member 28c extension 28d Locking part 28e Slope 29 Pan Frame 29a First Pan Frame 29b Second Pan Frame 30 Headrest pillar P1 pad material P1a support part P1b Bank P1b1 Surface bank P1b2 Back bank P2 pad material P3 padding P3a support part P3b Bank P3b1 Surface bank P3b2 Back bank P4 padding material P5 パッド material T1 surface material T2 surface material T3 surface material T4 surface material T5 surface material

Claims

1. A vehicle seat including a seat back that supports the back of an occupant and a seat cushion that supports the buttocks of the occupant, A seat frame forming a framework of at least one of the seat back and the seat cushion is a first frame having a seating surface for supporting the occupant; a second frame supporting the first frame, The seating surface of the first frame includes a first seating surface on which the occupant sits, and a second seating surface opposite to the first seating surface and on which the occupant sits, The vehicle seat is characterized in that the first frame is attached to the second frame in a manner that allows switching between the first seating surface and the second seating surface, which has a surface condition different from that of the first seating surface.

2. The first frame is an inner frame disposed inside the second frame, 2. The vehicle seat according to claim 1, wherein the second frame is an outer frame that supports the inner frame so as to switch between the first seating surface and the second seating surface.

3. the seat frame has a switching member that supports the inner frame rotatably relative to the outer frame, The vehicle seat according to claim 2, characterized in that the switching member is provided in a central portion in the extension direction of the inner frame, has a rotation shaft extending in the seat width direction, and switches between the first seating surface and the second seating surface by the rotation shaft.

4. The seat frame is a back frame that forms a framework of the seat back, The inner frame is a first pressure-receiving member that supports the occupant from behind; The vehicle seat according to claim 3, further comprising a second pressure-receiving member that is provided at a different position in the vertical direction from the first pressure-receiving member, has a different elastic force from the first pressure-receiving member, and supports the occupant from behind.

5. The seat frame is a cushion frame that forms a skeleton of the seat cushion, The inner frame is a first pressure-receiving member that supports the occupant from below; The vehicle seat according to claim 3, further comprising a second pressure-receiving member that is provided at a different position in the fore-and-aft direction from the first pressure-receiving member, has a different elastic force from the first pressure-receiving member, and supports the occupant from below.

6. The vehicle seat according to claim 4 or 5, characterized in that one of the first pressure-receiving member and the second pressure-receiving member has a wave-shaped shape extending in the seat width direction and has a spring member that is spanned inside the inner frame to support the occupant.

7. The vehicle seat according to claim 4 or 5, characterized in that one of the first pressure-receiving member and the second pressure-receiving member has an elastic spring that is stretched across the inside of the inner frame, and a plate-shaped member that is attached to the elastic spring and supports the occupant.

8. When the first seating surface faces the occupant, the first pressure-receiving member is disposed lower than the second pressure-receiving member and supports the lumbar region of the occupant from behind, The vehicle seat according to claim 4, characterized in that when the second seating surface faces the occupant, the second pressure-receiving member is positioned lower than the first pressure-receiving member and supports the lumbar region of the occupant from behind.

9. When the first seating surface faces the occupant, the second pressure-receiving member is disposed rearward of the first pressure-receiving member and supports the buttocks of the occupant from below, The vehicle seat according to claim 5, characterized in that when the second seating surface faces the occupant, the first pressure-receiving member is positioned rearward of the second pressure-receiving member and supports the occupant's buttocks from below.

10. the switching member has a rotation lock device that locks the rotation of the inner frame relative to the outer frame, The vehicle seat according to claim 3, wherein the rotation locking device locks the rotation of the inner frame relative to the outer frame when the extending direction of the inner frame and the extending direction of the outer frame are the same direction.

11. The vehicle seat is arranged in a plurality of rows in the width direction of the vehicle, the switching member is provided on an outer surface of the seat frame in a seat width direction and has an operation lever that unlocks the rotation lock device, The vehicle seat according to claim 10, wherein the operating lever is provided on the outer surface on an inner side in the width direction of the vehicle.

12. The vehicle seat includes: a reclining device that rotatably connects the seat back to the seat cushion and restricts rotation of the seat back relative to the seat cushion; a reclining operation lever for releasing the rotation restriction of the reclining device, the switching member has an operating lever that unlocks the rotation lock device, The vehicle seat according to claim 10, wherein the operation lever and the reclining operation lever are provided on different sides of the seat frame in the seat width direction.

13. The vehicle seat includes: a padding material disposed on the inner frame of the seat frame; a skin material that covers the pad material, 3. The vehicle seat according to claim 2, wherein the design surface of the cover material differs between the first seating surface and the second seating surface.

14. The vehicle seat has a padding material disposed on the inner frame of the seat frame, 3. The vehicle seat according to claim 2, wherein the hardness of the padding material differs between the first seating surface and the second seating surface.

15. The vehicle seat has a padding material disposed on the inner frame of the seat frame, The padding material is a support portion that supports the occupant; a bank portion disposed outside the support portion in the seat width direction, bulging from the support portion toward the occupant, and supporting the occupant from the side, 3. The vehicle seat according to claim 2, wherein the amount of expansion of the bank portion of the pad material differs between the first seating surface and the second seating surface.

16. The seat frame is a back frame that forms a framework of the seat back, The vehicle seat has a padding material disposed on the inner frame of the back frame, 3. The vehicle seat according to claim 2, wherein the thickness of the lower portion of the padding material is different between the first seating surface and the second seating surface.

17. The seat frame is a cushion frame that forms a skeleton of the seat cushion, The vehicle seat has a padding material disposed on the inner frame of the cushion frame, 3. The vehicle seat according to claim 2, wherein the thickness of the rear portion of the padding material is different between the first seating surface and the second seating surface.

18. The vehicle seat includes: a padding material disposed on the inner frame of the seat frame; a skin material that covers the pad material, 3. The vehicle seat according to claim 2, wherein the surface friction coefficient of the covering material is different between the first seating surface and the second seating surface.

19. the vehicle seat includes a headrest that supports the head of the occupant from behind; 3. The vehicle seat according to claim 2, wherein the headrest includes a headrest pillar formed integrally with the outer frame of the seat back, and a padding material disposed on the headrest pillar.

Images