Vehicle seats

Abstract

To obtain a vehicle seat few in occupant workload for rotating a moving member between the use and non-use positions of a headrest and producible at low cost.SOLUTION: A vehicle seat comprises: a headrest 20 supported by a seat back supporting the back part of a seating occupant, and supporting the seating occupant head; a pair of left and right moving members rotatable around a rotation axis 33 provided to the headrest between the use position capable of supporting a supported part which is a portion corresponding to an occipital bone in a head part in a seat longitudinal direction, and the non-use position which does not support the supported part; a drive part 40, at least a part of which is provided inside the headrest and rotating the moving member toward the use position by having use of a pressing force when the head part applies the pressing force to a front surface of the headrest that pushes the front surface backward; and an energizing member 35 generating an energizing force rotating the moving member toward the non-use position.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] The following Patent Documents 1 and 2 disclose vehicle seats equipped with a headrest that supports the head of a seated occupant. Furthermore, these vehicle seats are equipped with a pair of left and right movable members that can rotate relative to the headrest between a predetermined non-use position and a use position. When the left and right movable members are in the use position, the left and right movable members support the rear of the head of the seated occupant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4575832 [Patent Document 2] Patent No. 5087960 Summary of the Invention [Problem to be solved by the invention]

[0004] The movable member of the vehicle seat in Patent Document 1 is manually operated, so the seated occupant must use their hands or the like to rotate the movable member between the in-use position and the in-use position.

[0005] On the other hand, in the vehicle seat of Patent Document 2, the movable member is rotated between the non-use position and the use position using the power of a predetermined power source. Because this vehicle seat requires a power source, it is difficult to manufacture it inexpensively.

[0006] In consideration of the above, the present invention aims to provide a vehicle seat that requires little effort from the occupant to rotate the movable member relative to the headrest between the in-use position and the in-use position, and that can be manufactured inexpensively. [Means for solving the problem]

[0007] A first aspect of the vehicle seat includes a headrest supported by a seat back that supports the back of a seated occupant and that supports the head of the seated occupant; a pair of left and right movable members that can rotate around a rotation axis provided in the headrest between a use position where a supported portion, which is a portion of the head corresponding to the occipital bone, can be supported from the left and right of the seat and a non-use position where the supported portion is not supported from the left and right of the seat; a drive unit, at least a portion of which is provided inside the headrest, that uses a pressing force to rotate the movable member to the use position when the head applies a pressing force to the front of the headrest pushing the front face rearward; and a biasing member that generates a biasing force to rotate the movable member to the non-use position.

[0008] In the vehicle seat of the first aspect, when the head of a seated occupant applies a pressing force to the front of the headrest, pushing the headrest rearward, the drive unit uses the force transmitted from the head to the headrest to rotate the movable member to the in-use position. As a result, the left and right movable members support the supported portions, which are parts of the occipital bone of the occupant's head, from the left and right of the seat. Furthermore, when the head moves away from the headrest, the biasing force of the biasing member rotates the movable member to the in-use position. Therefore, the vehicle seat of the first aspect reduces the effort required by the occupant to rotate the movable member relative to the headrest between the in-use position and the in-use position.

[0009] The vehicle seat of the first aspect does not require a power source, and therefore can be manufactured inexpensively.

[0010] A second aspect of the vehicle seat is the vehicle seat of the first aspect, wherein a pair of left and right recesses are formed on the front surface of the headrest, and when the movable member is positioned in the non-use position, the movable member is positioned within the recesses, and when the movable member is positioned in the use position, at least a portion of the movable member is positioned outside the recesses.

[0011] In the vehicle seat of the second aspect, the movable member is positioned within the recess of the headrest when the movable member is in the non-use position, which improves the design of the headrest and the movable member.

[0012] The vehicle seat of the third aspect is the vehicle seat of the first aspect, wherein the drive unit includes a bag-shaped portion made of a flexible material that deforms when the head applies the pressing force to the front surface of the headrest, and a pair of left and right bellows, one end of which is fixed to the bag-shaped portion and the other end of which is integrated with the movable member, that can be deformed into a contracted state in which the movable member is positioned in the non-use position and an extended state in which the movable member is positioned in the use position, and the internal spaces of the left and right bellows are connected to the internal spaces of the bag-shaped portions, and when the bag-shaped portions are deformed by the pressing force, the bellows that were in the contracted state are extended.

[0013] In the vehicle seat of the third aspect, when the bag-shaped portion is deformed by the pressure transmitted from the head to the headrest, the bellows, which was in a contracted state, expands, and the movable member rotates to the use position. Therefore, the movable member is reliably rotated to the use position by utilizing the pressure. Furthermore, when the bag-shaped portion is deformed, a damping effect is exerted.

[0014] The vehicle seat of the fourth aspect is the vehicle seat of the first or second aspect, wherein the drive unit is located inside the headrest, is integrated with the left and right movable members, and is rotatable around the rotation axis between an initial position that positions the movable members in the non-use position and an operating position that positions the movable members in the use position, and includes a pair of left and right pressed members that rotate to the operating positions when subjected to the pressing force.

[0015] In the vehicle seat of the fourth aspect, the movable member can be reliably rotated to the use position by the drive unit with a simple configuration.

[0016] A vehicle seat according to a fifth aspect is the vehicle seat according to any one of the first to fourth aspects, wherein the biasing member is a spring member.

[0017] In the vehicle seat of the fifth aspect, the biasing member can be realized with a simple structure.

[0018] A sixth aspect of the vehicle seat is a vehicle seat according to any one of the first to fifth aspects, wherein the biasing member is an elastic cover member that covers the headrest and the outer surface of the movable member in the non-use position in a stretched state from a free state.

[0019] In the vehicle seat of the sixth aspect, the biasing member can be realized without using a spring member. Furthermore, since the outer surfaces of the headrest and the movable member are covered with the cover member, the design of the headrest and the movable member is improved. [Effects of the Invention]

[0020] The vehicle seat according to the present invention has the excellent effect of requiring only a small effort from the occupant to rotate the movable member relative to the headrest between the in-use position and the in-use position, and can be manufactured at low cost. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a front view of a vehicle seat and a seated occupant according to a first embodiment. [Figure 2] FIG. 2 is a perspective view of a headrest frame, a hinge member, a torsion spring, and a drive unit. [Figure 3] FIG. 3 is a cross-sectional view taken along the arrow line 3-3 in FIG. 2. [Figure 4] FIG. 10 is a perspective view of the headrest and the movable member separated from each other, with the hinge member omitted. [Figure 5] FIG. 2 is a perspective view of the headrest and the movable member positioned in the non-use position. [Figure 6] FIG. 10 is a side view of the headrest and the movable member positioned in the non-use position. [Figure 7] 6 is a perspective view similar to FIG. 5 when the head of a seated occupant presses against the front surface of the headrest. FIG. [Figure 8]7 is a side view similar to FIG. 6 when the head of a seated occupant presses against the front surface of the headrest. [Figure 9] 10 is a plan view of the headrest and the movable member when the head of a seated occupant presses against the front surface of the headrest. FIG. [Figure 10] FIG. 10 is a front view of a vehicle seat and a seated occupant according to a second embodiment. [Figure 11] FIG. 11 is a cross-sectional view taken along the arrow line 11-11 in FIG. [Figure 12] 10 is a plan view of the headrest and the movable member when the head of a seated occupant is away from the front of the headrest. FIG. [Figure 13] 10 is a plan view of the headrest and the movable member when the head of a seated occupant presses against the front surface of the headrest. FIG. [Figure 14] 10 is a perspective view showing a headrest and a movable member of a modified example, and a cover member separated from the headrest and the movable member. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] A vehicle seat 10 (hereinafter referred to as seat 10) according to a first embodiment of the present invention will be described below with reference to Figures 1 to 9. Note that the arrow FR shown as appropriate in each figure indicates the front direction of the seat, the arrow UP indicates the upward direction of the seat, and the arrow LH indicates the left side in the left-right direction of the seat (seat width direction). Hereinafter, when the terms front-rear, left-right, and up-down are used in the description, they refer to front-rear in the front-rear direction of the seat, left-right in the left-right direction of the seat, and up-down in the up-down direction of the seat.

[0023] The seat 10 shown in FIG. 1 is provided on the floor surface of the passenger compartment of a vehicle (not shown). The seat 10 includes a seat cushion (not shown) supported on the floor surface via a slide rail device (not shown), a seat back 15 whose lower end is connected to the rear end of the seat cushion, and a headrest 20 supported on the upper end of the seat back 15. The seat cushion 11 supports the buttocks of a seated occupant P (see FIGS. 1, 7, and 8) from below. The seat back supports the back of the seated occupant P from behind. The headrest 20 supports the head P1 of the seated occupant from behind. The seat back 15 can be reclined in the front-to-rear direction relative to the seat cushion 11.

[0024] The headrest 20 has a headrest frame 21, a hinge member 30, a torsion spring (spring member) (biasing member) 35, a drive unit 40, a main body 45, a movable member 50, and a first cover member and a second cover member, which will be described later. When a center line AX (see FIG. 1) is defined as passing through the center of the headrest 20 in the left-right direction and extending in the up-down direction, the headrest 20 is symmetrical about the center line AX in a front view.

[0025] A headrest frame 21 shown in FIG. 2 is provided inside the headrest 20. The headrest frame 21 is made of a metal pipe. The headrest frame 21 includes a pair of left and right side portions 22, a pair of left and right upper end portions 23, a pair of left and right downward extension portions 24, a pair of left and right inclined portions 25, and one connecting portion 26. The left and right side portions 22 are linear. In the following description, the left and right side portions 22 are assumed to be parallel to the vertical direction (up-down direction). That is, the up-down direction of the seat is assumed to coincide with the vertical direction. The left and right upper end portions 23 extend forward from the upper ends of the left and right side portions 22. The left and right downward extension portions 24 extend downward from the front ends of the left and right upper end portions 23. The left and right inclined portions 25 extend diagonally downward from the downward extension portions 24. The lower ends of the left and right inclined portions 25 are connected to each other by a connecting portion 26 extending in the left-right direction. The lower ends of the left and right side portions 22 are fixed to the upper end of the seat back 15. The left and right side portions 22 may be supported by the upper end of the seat back 15 so as to be slidable in the extension direction of the side portions 22.

[0026] As shown in FIG. 2, hinge members 30 are provided on the left and right inclined portions 25 of the headrest frame 21. For example, the hinge members 30 are made of metal. The left and right hinge members 30 each have a fixed portion 31, a rotating portion 32, and a rotation support portion (rotation shaft) 33. The cross-sectional shape of the fixed portion 31 is an arc shape with the same curvature as the outer circumferential surface of the inclined portion 25. The inner circumferential surface of the fixed portion 31 is fixed to the outer circumferential surface of the inclined portion 25. The rotation portion 32 is shaped like a flat plate. The side edges of the fixed portion 31 and the rotation portion 32 are connected to the rotation support portion 33 so as to be rotatable around the axis of the rotation support portion 33. The axis of the rotation support portion 33 is parallel to the axis of the inclined portion 25. Furthermore, a torsion spring 35 is attached to the rotation support portion 33. One end 36 of the torsion spring 35 abuts against the fixed portion 31, and the other end 37 of the torsion spring 35 abuts against the rotating portion 32. The rotating portion 32 is rotatable around the rotation support portion 33 between a first position shown in Figures 2 and 3 and a second position shown in Figure 9. Furthermore, the left and right torsion springs 35 constantly generate a biasing force that rotationally biases the rotating portion 32 toward the first position.

[0027] As shown in FIG. 2, the headrest 20 includes a drive unit 40. The drive unit 40 is a one-piece molded product made of a flexible material. The drive unit 40 is made of, for example, silicone or resin. The drive unit 40 can be manufactured by, for example, blow molding. The drive unit 40 includes one bag-shaped portion 41 and a pair of left and right bellows 42. Both left and right ends of the bag-shaped portion 41 are connected to the inner ends of the left and right bellows 42. In other words, the internal space of the bag-shaped portion 41 and the internal spaces of the left and right bellows 42 are in communication with each other.

[0028] As shown in FIG. 4, the headrest 20 includes a main body 45 that is positioned around the headrest frame 21 and fixed to the headrest frame 21. The main body 45 is a one-piece molded product made of urethane. For example, the main body 45 is manufactured using a mold (not shown). As shown in FIGS. 1 and 4, recesses 46 are formed on both left and right ends of the lower end of the front surface of the main body 45. Mounting recesses (not shown) that extend toward the inside of the main body 45 are formed on the underside of the manufactured main body 45. The integrated unit consisting of the headrest frame 21, hinge member 30, and torsion spring 35 is inserted into the mounting recess of the main body 45. In other words, the integrated unit is covered by the main body 45. The hinge member 30, torsion spring 35, and drive unit 40 are operable within the mounting recess. Furthermore, slits (not shown) are formed in the main body 45 at locations corresponding to the left and right recesses 46. The rotating portions 32 of the left and right hinge members 30 and the front portions of the left and right bellows 42 are located outside the main body portion 45 via the left and right slits.

[0029] Furthermore, although not shown in the drawings, a first cover member (not shown) made of a flexible material is attached to the outer peripheral surface of main body portion 45. The outer shape of this first cover member is substantially the same as that of main body portion 45. That is, the shapes of both left and right side portions of the first cover member correspond to the shapes of recessed portion 46. Furthermore, slits are formed on both left and right side portions of the first cover member to allow the rotating portions 32 of the left and right hinge members 30 and the front portions of the left and right bellows 42 to move from the inside to the outside of the first cover member.

[0030] Furthermore, as shown in FIG. 4, the headrest 20 has a pair of left and right movable members 50. The front shape of each movable member 50 is substantially the same as the shape of the corresponding recess 46. The movable members 50 are integrally molded from urethane. As shown in FIG. 3, the back surface (rear surface) of the movable member 50 is fixed to the front surface of the rotating portion 32 of the hinge member 30. Furthermore, the outer ends (front end portions) of the left and right bellows 42 are fixed in an airtight manner to the back surfaces (rear surfaces) of the left and right movable members 50, respectively. In other words, the bellows 42 and the movable members 50 are integrated. Furthermore, a second cover member (not shown) made of a flexible material is attached to the outer peripheral surface of the movable member 50.

[0031] The rotating portion 32, bellows 42, and movable member 50 of the hinge member 30 are interlocked. That is, as shown in FIGS. 2 and 5, when the left and right rotating portions 32 are located in the first position, the left and right bellows 42 are contracted, and the movable members 50 are located in the non-use position housed in the corresponding recesses 46. On the other hand, as shown in FIGS. 7 to 9, when the left and right rotating portions 32 are located in the second position, the left and right bellows 42 are extended, and the movable members 50 are located in the use position with a portion of the movable member 50 located forward of the corresponding recesses 46. As shown in FIGS. 5 and 6, when the movable member 50 is located in the non-use position, the front surface of the movable member 50 is approximately flush with the front surface of the main body portion 45, the bottom surface of the movable member 50 is approximately flush with the bottom surface of the main body portion 45, and the side surfaces of the movable member 50 are approximately flush with the side surfaces of the main body portion 45. On the other hand, as shown in FIGS. 7 to 9, when the movable member 50 is in the use position, the use movable member 50 is inclined with respect to the front surface of the main body part 45 in a side view and a plan view.

[0032] (Actions and Effects of This Embodiment) Next, the operation and effects of this embodiment will be described.

[0033] Assume now that a seated occupant P is seated in the seat 10 and the head P1 of the seated occupant P is spaced forward from the front surface of the main body 45. At this time, the buttocks of the seated occupant P are supported by the seat cushion, and the back is supported by the seat back 15. Furthermore, the left and right rotating parts 32 are positioned in the first position due to the biasing forces generated by the left and right torsion springs 35. Therefore, the left and right bellows 42 are contracted, and the left and right movable members 50 are positioned in the non-use position. That is, at this time, the headrest 20 is in the state shown in FIGS. 1 and 5.

[0034] 7 to 9 show a state in which the supported portion PS, which is a portion of the head P1 of the seated occupant P that corresponds to the occipital bone, is in contact with the front surface of the main body portion 45. At this time, the supported portion PS applies a rearward pressing force to the front surface of the main body portion 45. As a result, the first cover member and the main body portion 45 are deformed so as to be recessed rearward, and the pressing force is transmitted to the bag-shaped portion 41 via the first cover member and the main body portion 45. When the bag-shaped portion 41 receives the pressing force, the bag-shaped portion 41 deforms to reduce its volume. As a result, some of the air in the internal space of the bag-shaped portion 41 flows into the internal spaces of the left and right bellows 42, causing the left and right bellows 42 to deform to an extended state against the biasing force of the torsion spring 35. As a result, the left and right movable members 50 rotate to the use position as shown in FIGS. 7 to 9. 8, in a side view of the seat, the left and right movable members 50 overlap the supported portion PS of the seated occupant P in the left-right direction, and the left and right movable members 50 support only a portion of the head P1 of the seated occupant P that is rearward of the mastoid process. At this time, the supported portion PS is supported from the left and right directions of the seat by the left and right movable members 50, and is also supported from the rear side of the seat toward the front and diagonally upward directions of the seat. This suppresses rocking of the head P1 of the seated occupant P, and suppresses motion sickness of the seated occupant P1.

[0035] As described above, in the seat 10 of this embodiment, when the head P1 of the seated occupant P applies the pressing force to the front surface of the main body 45, the drive unit 40 uses the pressing force to rotate the left and right movable members 50 from the non-use position to the use position. Furthermore, when the head P1 moves forward away from the main body 45, for example, when the vehicle stops, the biasing force of the torsion spring 35 causes the left and right bellows 42 to return to the contracted state. Furthermore, as shown in FIGS. 7 and 8 , the movable members 50 in the use position are inclined with respect to the front surface of the main body 45 in a side view and a plan view. Therefore, at this time, the weight of the movable members 50 causes the left and right bellows 42 to return to the contracted state. Therefore, when the head P1 moves forward away from the main body 45, the movable members 50 automatically return to the non-use position. Therefore, the seat 10 reduces the effort required by the seated occupant P to rotate the movable members 50 relative to the main body 45 between the non-use position and the use position.

[0036] Furthermore, the headrest 20 does not require a power source, so the headrest 20 (seat 10) of this embodiment can be manufactured inexpensively.

[0037] Furthermore, for example, when the vehicle turns while the movable members 50 are in the use position, the head P1 may temporarily move forward away from the main body 45. In this case, the bag-shaped portions 41 attempt to return to their initial positions, causing the left and right movable members 50 to rotate toward the non-use positions. However, at this time, the bag-shaped portions 41 exert a damping effect, preventing the movable members 50 from rotating forcefully toward the non-use positions. Therefore, even when the vehicle turns, the supported portion PS is easily supported by the left and right movable members 50.

[0038] Furthermore, when the left and right movable members 50 are in the non-use position, the movable members 50 are located within the recesses 46 of the main body 45. Furthermore, at this time, the front surface of the movable members 50 is approximately flush with the front surface of the main body 45, the bottom surface of the movable members 50 is approximately flush with the bottom surface of the main body 45, and the side surfaces of the movable members 50 are approximately flush with the side surfaces of the main body 45. This results in good design of the headrest 20 and the movable members 50.

[0039] Next, a seat 10 according to a second embodiment of the present invention will be described with reference to Figures 10 to 13. The same members as those in the first embodiment are given the same reference numerals, and detailed descriptions thereof will be omitted.

[0040] The headrest 20 of the second embodiment does not include the hinge member 30, the torsion spring 35, and the drive unit 40, but instead includes a pair of left and right drive units 60, a torsion spring 67, and a damper .

[0041] As shown in FIGS. 10 and 11 , the drive unit 60 of this embodiment includes a pair of left and right rotating members 61 and a pressed member 65. The left and right rotating members 61 are supported by the left and right inclined portions 25 of the headrest frame 21. For example, the rotating members 61 are made of metal. The left and right rotating members 61 each include a rotation support portion (rotation shaft) 62, a fixed portion 63, and a connecting portion 64. The rotation support portion 62 is cylindrical, and the inclined portion 25 passes through the rotation support portion 62. The axis of the rotation support portion 62 is parallel to the axis of the inclined portion 25. The rotation support portion 62 is rotatable around the axis of the rotation support portion 62 relative to the inclined portion 25. The side edges of the fixed portion 63 and the connecting portion 64 are fixed to the outer circumferential surface of the rotation support portion 62. In a front view, the connecting portion 64 extends from the rotation support portion 62 toward the center of the headrest 20, and the fixed portion 63 extends toward the opposite side of the connecting portion 64. The fixed portion 63 and the connecting portion 64 are both flat plate-shaped and are substantially parallel to each other. The rear surface of a flat support member 75 is fixed to the front surface of the fixed portion 63. For example, the support member 75 can be made of metal or hard resin. The fixed portions 63 and support members 75 of the left and right rotating members 61 are positioned outside the first cover member through slits in the main body portion 45 and the first cover member. Furthermore, the rear surface (rear surface) of the movable member 50 is fixed to the front surface of the support member 75.

[0042] Furthermore, flat pressed members 65 parallel to the connecting portions 64 are fixed to the left and right connecting portions 64. The pressed members 65 are made of, for example, metal.

[0043] As shown in FIG. 11 , torsion springs (spring members) (biasing members) 67 are provided on the left and right inclined portions 25. One end of the torsion spring 67 is fixed to the inclined portion 25, and the other end 68 of the torsion spring 67 abuts against the fixed portion 63. The rotating member 61 and the pressed member 65 are rotatable around the rotation support portion 62 between the initial position shown in FIGS. 10 to 12 and the operating position shown in FIG. 13. As shown in FIG. 12 , when the left and right rotating members 61 and the pressed members 65 are located in the initial positions and the headrest 20 is viewed from above, the left and right pressed members 65 are located on the same plane. Furthermore, the left and right torsion springs 67 constantly generate a biasing force that rotationally biases the rotating member 61 toward the initial position. Furthermore, as shown in FIG. 10 , a damper 70 is provided between the inclined portion 25 and the connecting portion 64.

[0044] (Actions and Effects of This Embodiment) Next, the operation and effects of this embodiment will be described.

[0045] Now, let us assume that a seated occupant P is seated on the seat 10 and the head P1 of the seated occupant P is spaced forward from the front surface of the main body 45. At this time, the buttocks of the seated occupant P are supported by the seat cushion, and the back is supported by the seat back 15. Furthermore, the biasing forces generated by the left and right torsion springs 67 position the left and right rotating members 61 and the pressed members 65 in their initial positions. Therefore, the left and right movable members 50 are positioned in the unused position. That is, at this time, the headrest 20 is in the state shown in FIGS. 10 and 12.

[0046] In this state, when the supported portion PS of the seated occupant P comes into contact with the front surface of the main body portion 45, the pressing force applied by the supported portion PS to the front surface of the main body portion 45 causes the first cover member and the main body portion 45 to deform so as to be recessed rearward, and the pressing force is transmitted via the main body portion 45 to the left and right pressed members 65 located in the initial position. As a result, the left and right pressed members 65 and the rotating member 61 rotate to the operating position against the biasing force of the torsion spring 67. When the left and right rotating members 61 and the pressed members 65 move to the operating position, the left and right movable members 50 support only the portion of the head P1 of the seated occupant P that is rearward of the mastoid process, as in the first embodiment. This suppresses rocking of the head P1 of the seated occupant P, and reduces motion sickness of the seated occupant P1.

[0047] Furthermore, for example, when the vehicle stops and the head P1 moves forward away from the main body 45, the left and right rotating members 61 and the pressed member 65 tend to return to their initial positions due to the biasing force of the torsion spring 67. Furthermore, the left and right rotating members 61 and the pressed member 65 tend to return to their initial positions due to the weight of the movable member 50 and the support member 75. Therefore, when the head P1 moves forward away from the main body 45, the movable member 50 automatically returns to the non-use position. Therefore, the seat 10 can reduce the effort required by the seated occupant P to rotate the movable member 50 relative to the main body 45 between the non-use position and the use position.

[0048] Furthermore, when the head P1 moves forward away from the main body 45, the left and right movable members 50 return to the non-use position due to the biasing force of the torsion springs 67. Therefore, the seat 10 can reduce the effort required by the seated occupant P to rotate the movable members 50 relative to the main body 45 between the non-use position and the use position.

[0049] Furthermore, since the headrest 20 of this embodiment is provided with the damper 70, the supported portion PS is easily supported by the left and right movable members 50 even when the vehicle is turning.

[0050] Furthermore, the headrest 20 of this embodiment does not require a power source. Furthermore, the configuration of the drive unit 60 of this embodiment is simpler than the configuration of the drive unit 40 of the first embodiment. Therefore, the headrest 20 (seat 10) of this embodiment can be manufactured inexpensively.

[0051] Although the above-mentioned embodiments of the present invention have been described, the present invention is not limited to these embodiments.

[0052] For example, the present invention may be embodied in a modified version of the first embodiment shown in FIG. 14 . In this modified version, cover members (biasing members) 80 are attached to the outer peripheral surfaces of the main body 45 and the movable members 50. Furthermore, the cover members 80 are elastic, and when the left and right movable members 50 are in the non-use position, the cover members 80 are extended from their free state. That is, regardless of the position of the left and right movable members 50, the cover members 80 exert a biasing force that biases the left and right movable members 50 toward the use position. The headrest 20 of this modified version does not include the torsion spring 35. According to this modified version, the elastic cover member 80 performs the same function as the torsion spring 35. Note that, although not shown, this modified version may be applied to the second embodiment. In this case, the torsion spring 67 is also omitted from the headrest 20. Furthermore, when this modified version is applied to the first and second embodiments, the first and second cover members may be omitted from the headrest 20. When this modification is applied to the first and second embodiments, the headrest 20 may be provided with the torsion springs 35 and 67.

[0053] The bag-shaped portion 41 and the bellows 42 of the drive portion 40 of the first embodiment may be manufactured separately, and the left and right bellows 42 may be fixed to the bag-shaped portion 41 after manufacturing.

[0054] A support member 75 may be fixed to the front end of the bellows 42 of the headrest 20 of the first embodiment, and the movable member 50 may be fixed to the support member 75.

[0055] The rotating member 61 of the second embodiment may include a pressed member 65. That is, the rotating member 61 may include a connecting portion 64 that is integrated with the pressed member 65.

[0056] The first cover member and the left and right second cover members may be integrated so as to be rotatable relative to each other. For example, the first cover member and the left and right second cover members may be sewn together to integrate the first cover member with the left and right second cover members. When this modification is applied to the first embodiment, the hinge member 30 can be omitted from the headrest 20. [Explanation of symbols]

[0057] 10 Vehicle seats (seats) 20 Headrest 33 Rotation support part (rotation axis) 35 Torsion spring (spring member) (biasing member) 40 Drive unit 41 Pouch 42 Bellows 46 Recess 50 Movable parts 60 Drive unit 65 Pressurized member 62 Rotation support part (rotation axis) 67 Torsion spring (spring member) (biasing member) 80 Cover member (biasing member) P Seated occupant P1 head PS Supported part

Claims

1. a headrest supported by a seat back that supports the back of a seated occupant and that supports the head of the seated occupant; a pair of left and right movable members that are rotatable about a rotation axis provided on the headrest between a use position that can support a supported portion, which is a portion of the head corresponding to the occipital bone, from the left-right direction of the seat and a non-use position that does not support the supported portion from the left-right direction of the seat; a drive unit at least a portion of which is provided inside the headrest, and which, when the head applies a pressing force to a front surface of the headrest so as to press the front surface rearward, uses the pressing force to rotate the movable member to the use position; a biasing member that generates a biasing force that rotates the movable member to the non-use position; Equipped with The drive unit is a bag-shaped portion made of a flexible material that deforms when the head applies the pressing force to the front surface of the headrest; a pair of left and right bellows, one end of which is fixed to the bag-shaped portion and the other end of which is integrated with the movable member, and which are deformable between a contracted state in which the movable member is positioned at the non-use position and an extended state in which the movable member is positioned at the use position; Equipped with The internal spaces of the left and right bellows are connected to the internal spaces of the bag-shaped portion, and when the bag-shaped portion is deformed by the pressing force, the bellows, which were in the contracted state, are expanded.

2. A pair of left and right recesses is formed on the front surface of the headrest, 2. The vehicle seat according to claim 1, wherein the movable member is positioned within the recess when the movable member is positioned at the non-use position, and at least a portion of the movable member is positioned outside the recess when the movable member is positioned at the use position.

3. a headrest supported by a seat back that supports the back of a seated occupant and that supports the head of the seated occupant; a pair of left and right movable members that are rotatable about a rotation axis provided on the headrest between a use position that can support a supported portion, which is a portion of the head corresponding to the occipital bone, from the left-right direction of the seat and a non-use position that does not support the supported portion from the left-right direction of the seat; a drive unit at least a portion of which is provided inside the headrest, and which, when the head applies a pressing force to a front surface of the headrest so as to press the front surface rearward, uses the pressing force to rotate the movable member to the use position; a biasing member that generates a biasing force that rotates the movable member to the non-use position; Equipped with The biasing member is The vehicle seat is a cover member having elasticity that covers the headrest and the outer surfaces of the movable member in the non-use position in a state stretched from a free state.

4. The drive unit is 3. The vehicle seat according to claim 1, further comprising a pair of left and right pressure-receiving members that are located inside the headrest, are integrated with the left and right movable members, and are rotatable about the rotation axis between an initial position that positions the movable members in the non-use position and an actuation position that positions the movable members in the use position, and rotate to the actuation position when subjected to the pressing force.

5. The vehicle seat according to any one of claims 1 to 4, wherein the biasing member is a spring member.

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