Headrest and seat for vehicle

Abstract

To provide a headrest which can displace right and left lateral side support parts by interlocking with a central support part and to provide a seat for a vehicle.SOLUTION: A headrest 16 of a seat 10 for a vehicle includes a central support part 26 which is arranged to face a head part of a seated occupant in a seat front-back direction and supports the head part of the seated occupant from a seat rear side. The headrest 16 includes a pair of right and left lateral side support parts 28 respectively arranged on a seat left side and a seat right side with respect to the central support part 26 and an interlocking displacement part 22. The interlocking displacement part 22 allows the central support part 26 to displace to the opposite side of the head part of the seated occupant and displaces the pair of the right and left lateral side support parts 28 to a central part side in a seat right and left direction respectively when the central support part 26 is pressed by the head part of the seated occupant.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] Patent Document 1 below discloses a headrest that supports the head of an occupant seated in a vehicle seat. The headrest described in this document includes a central pad and two side pads provided on both the left and right sides of the central pad. These side pads are rotatable forward in a rest position and rearward in a support position. This allows the head to be properly and comfortably supported according to the occupant's seated posture. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2005-518984 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in the configuration described in Patent Document 1, it is possible to rotate the left and right side support parts (two side pads) relative to the central support part (central pad), but it is not possible to displace the left and right side support parts in conjunction with the central support part.

[0005] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a headrest and a vehicle seat in which the left and right side support portions can be displaced in conjunction with the central support portion. [Means for solving the problem]

[0006] The headrest of the first embodiment comprises a central support portion that is positioned opposite the head of the seated occupant in the fore-and-aft direction of the seat and supports the head of the seated occupant from the rear side of the seat, a pair of left and right lateral support portions that are positioned on the left and right sides of the central support portion, and a linked displacement portion that, when the central support portion is pressed by the head of the seated occupant, allows the central support portion to be displaced to the side opposite the head of the seated occupant and displaces each of the pair of left and right lateral support portions toward the center of the seat in the left-right direction.

[0007] In the headrest of the first aspect, when the central support portion is pressed by the head of a seated occupant, the interlocking displacement portion allows the central support portion to be displaced in the direction opposite the head of the seated occupant. In addition, the interlocking displacement portion displaces each of the pair of left and right side support portions toward the center of the seat in the left-right direction. In this way, in the headrest of the first aspect, the left and right side support portions can be displaced in conjunction with the central support portion.

[0008] The headrest of the second aspect further includes a biasing member that displaces the central support portion toward the head of the seated occupant and displaces the pair of left and right lateral support portions to both sides of the seat in the left-right direction.

[0009] In the headrest of the second aspect, when the head of the seated occupant moves away from the central support portion, the biasing member displaces the central support portion toward the head of the seated occupant and displaces the pair of left and right side support portions to both sides in the left-right direction of the seat. In this way, in the headrest of the second aspect, when the head of the seated occupant moves away from the central support portion, the central support portion and the pair of left and right side support portions can be returned to their original positions.

[0010] The headrest of the third aspect is the headrest of the first aspect, wherein the interlocking displacement portion includes a first displacement member supported so as to be displaceable together with the central support portion, a rotating member that rotates as the first displacement member is displaced, and a pair of left and right second displacement members that are engaged with the rotating member and are displaceable together with the pair of left and right lateral support portions, and that displace along the rotational axis direction of the rotating member together with the pair of left and right lateral support portions as the rotating member rotates.

[0011] In the headrest of the third aspect, when the central support portion is pressed by the head of a seated occupant, the central support portion is displaced together with the first displacement member toward the opposite side of the seated occupant's head. Furthermore, when the first displacement member is displaced toward the opposite side of the seated occupant's head, the rotating member rotates. Furthermore, when the rotating member rotates, the pair of left and right second displacement members are displaced along the rotation axis direction of the rotating member. That is, the pair of left and right second displacement members are displaced toward the center of the seat in the left-right direction. This displaces the pair of left and right side support portions toward the center of the seat in the left-right direction. In this way, in the headrest of the third aspect, the left and right side support portions can be displaced in conjunction with the central support portion.

[0012] The headrest of the fourth aspect is the headrest of the third aspect, further comprising a biasing member that displaces the first displacement member toward the head side of the seated occupant, and when the first displacement member is displaced toward the head side of the seated occupant by the biasing member, the central support portion is displaced toward the head side of the seated occupant and the pair of left and right lateral support portions are displaced to both sides in the left-right direction of the seat.

[0013] In the headrest of the fourth aspect, when the head of the seated occupant moves away from the central support portion, the first displacement member is displaced toward the head of the seated occupant by the biasing member. As a result, the central support portion is displaced toward the head of the seated occupant. Furthermore, when the rotating member rotates as the first displacement member is displaced toward the head of the seated occupant by the biasing member, the pair of left and right second displacement members are displaced along the rotation axis direction of the rotating member. That is, the pair of left and right second displacement members are displaced to both sides in the left-right direction of the seat, respectively. As a result, the pair of left and right lateral support portions are displaced to both sides in the left-right direction of the seat, respectively. In this way, in the headrest of the fourth aspect, when the head of the seated occupant moves away from the central support portion, the central support portion and the pair of left and right lateral support portions can be returned to their original positions.

[0014] A fifth aspect of the vehicle seat comprises a seat cushion that supports the buttocks of a seated occupant from below the seat, a seat back that supports the back of the seated occupant from the rear side of the seat, and a headrest that supports the head of the seated occupant, and the headrest is configured to include a central support portion that is arranged opposite the head of the seated occupant in the fore-and-aft direction of the seat and supports the head of the seated occupant from the rear side of the seat, a pair of left and right side support portions that are arranged on the left and right sides of the central support portion, and a linked displacement portion that allows the central support portion to be displaced to the side opposite the head of the seated occupant when the central support portion is pressed by the head of the seated occupant, and displaces the pair of left and right side support portions toward the center of the seat in the left-right direction.

[0015] In the vehicle seat of the fifth aspect, the buttocks, back, and head of a seated occupant are supported by the seat cushion, seat back, and headrest, respectively. Here, when the central support portion of the headrest is pressed by the head of the seated occupant, the interlocking displacement portion allows the central support portion to be displaced toward the opposite side of the head of the seated occupant. In addition, the interlocking displacement portion displaces a pair of left and right side support portions of the headrest toward the center of the seat in the left-right direction. In this way, in the vehicle seat of the fifth aspect, the left and right side support portions can be displaced in conjunction with the central support portion. [Effects of the Invention]

[0016] The headrest and vehicle seat according to the present invention have the excellent effect of being able to displace the left and right side support portions in conjunction with the central support portion. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a side view schematically showing a vehicle seat according to an embodiment of the present invention; [Figure 2] FIG. 10 is a perspective view showing the headrest, illustrating a state in which no load is input to the central support portion. [Figure 3] 10 is a perspective view showing the headrest stay and the interlocking displacement portion, illustrating a state in which no load is input to the central support portion. FIG. [Figure 4] 5A and 5B are schematic diagrams showing a biasing member and the like. [Figure 5] FIG. 10 is a perspective view showing the headrest, illustrating a state in which a load is input to the central support portion. [Figure 6] 10 is a perspective view showing the headrest stay and the interlocking displacement portion, illustrating a state in which a load is input to the central support portion. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] 1 to 6, a vehicle seat 10 according to an embodiment of the present invention will be described. In the drawings, the arrow FR indicates the front side of the seat, the arrow UP indicates the upper side of the seat, the arrow RH indicates the right side in the seat width direction, and the arrow LH indicates the left side in the seat width direction. In the following description, unless otherwise specified, when referring to front-rear, up-down, and left-right directions, these refer to front-rear in the seat front-rear direction, up-down in the seat up-down direction, and left-right in the seat width direction.

[0019] 1, a vehicle seat 10 of this embodiment includes a seat cushion 12 that supports the buttocks of a seated occupant from below, a seat back 14 that supports the back of the seated occupant from the rear, and a headrest 16 that supports the head of the seated occupant. The lower end of the seat back 14 is supported on the rear end of the seat cushion 12 so as to be reclined in the front-to-rear direction.

[0020] As shown in Figures 1 and 2, the headrest 16 is composed of a headrest stay 18 supported on the upper end of the seat back 14, a headrest main body 20 supported on the upper end of the headrest stay 18, and a linked displacement portion 22 provided inside the headrest main body 20.

[0021] As shown in Figures 2 and 3, the headrest stay 18 is formed by bending or otherwise processing a rod-shaped or pipe-shaped steel material. The headrest stay 18 includes a pair of left and right first stay portions 18A that are spaced apart in the left-right direction and extend in the up-down direction. The headrest stay 18 also includes a pair of left and right second stay portions 18B that extend upward from the upper ends of the pair of left and right first stay portions 18A. The pair of left and right second stay portions 18B are inclined forward as they extend upward. The headrest stay 18 also includes a third stay portion 18C that connects the upper ends of the pair of left and right second stay portions 18B in the left-right direction.

[0022] 2, the headrest main body 20 has a fixing portion 24 fixed to a pair of left and right second stay portions 18B and third stay portions 18C of the headrest stays 18. The headrest main body 20 also has a central support portion 26 provided in front of the fixing portion 24 and a pair of left and right lateral support portions 28.

[0023] The central support portion 26 is disposed facing the head of the seated occupant in the front-rear direction and supports the head of the seated occupant from the rear side. When viewed from the front side, the central support portion 26 is formed in a rectangular shape with the longitudinal direction extending in the up-down direction. Note that the shape of the central support portion 26 viewed from the front side may be formed in an inverted trapezoid shape with the left-right dimensions gradually decreasing toward the bottom. The upper end of the central support portion 26 is fixed to the upper end of the fixed portion 24. Here, a portion 26B of the central support portion 26 below a portion 26A fixed to the fixed portion 24 is separated from the fixed portion 24 in the front-rear direction and is capable of moving in the front-rear direction relative to the fixed portion 24.

[0024] The pair of left and right side support parts 28 are disposed on the left and right sides of the central support part 26. The pair of left and right side support parts 28 are capable of moving left and right along the front surface of the fixed part 24. Note that, if the central support part 26 has an inverted trapezoidal shape as seen from the front side as described above, the pair of left and right side support parts 28 may be configured so that the shape of the pair of left and right side support parts 28 as seen from the front side corresponds to the shape of the central support part 26. In other words, the left and right distance between the pair of left and right side support parts 28 as seen from the front side may be configured to gradually narrow downward.

[0025] As shown in Figure 3, the interlocking displacement portion 22 is composed of a base portion 30 fixed to the headrest stay 18, a rack 32 and a rotating member 34 as first displacement members supported by the base portion 30, a pinion gear 36 fixed to the rotating member 34, a pair of left and right nuts 38 as second displacement members threadedly engaged with the rotating member 34, and a biasing member 40 (see Figure 4).

[0026] The base portion 30 is formed by subjecting a steel plate to press processing or the like. The base portion 30 includes a pair of left and right fixing plate portions 30A fixed to the pair of left and right second stay portions 18B of the headrest stay 18 by welding or the like, respectively, and a base portion main body 30B extending forward from the lower ends of the pair of left and right fixing plate portions 30A. A support groove 30C with an open upper side is formed in the front-rear direction in the center of the base portion main body 30B in the left-right direction. Furthermore, on both left and right sides of the support groove 30C in the base portion main body 30B, rotation support portions 30D are formed by cutting and raising a portion of the base portion main body 30B upward. Each of the pair of left and right rotation support portions 30D has a circular through-hole penetrating in the left-right direction.

[0027] The rack 32 is formed in the shape of a rectangular block with its longitudinal direction extending in the front-rear direction. The rack 32 is disposed inside the support groove 30C of the base portion 30 and is supported so as to be slidable in the front-rear direction. Gear teeth that mesh with a pinion gear 36 (described later) are formed on the upper portion of the rack 32 along the front-rear direction. The front end of the rack 32 is fixed to a lower portion 26B of the central support portion 26. This allows the rack 32 to displace in the front-rear direction together with the lower portion 26B of the central support portion 26.

[0028] The rotating member 34 is shaped like a rod with its rotation axis extending in the left-right direction. The rotating member 34 is inserted into through-holes formed in a pair of left and right rotation support members 30D of the base 30, thereby being rotatably supported with its rotation axis extending in the left-right direction. A threaded portion for threading a left nut 38 is formed in a left-side region 34A of the rotating member 34 relative to the portion supported by the left rotation support member 30D. A threaded portion for threading a right nut 38 is formed in a right-side region 34B of the rotating member 34 relative to the portion supported by the right rotation support member 30D. The threaded portions formed in the left-side region 34A and the right-side region 34B of the rotating member 34 are in a right-hand thread and reverse-thread relationship. Similarly, the threaded portions of the left nut 38 and the right nut 38 are in a right-hand thread and reverse-thread relationship. The left nut 38 is fixed to the left lateral support member 28. This allows the left nut 38 to move left and right together with the left lateral support part 28. In addition, the right nut 38 is fixed to the right lateral support part 28. This allows the right nut 38 to move left and right together with the right lateral support part 28.

[0029] The pinion gear 36 is formed in a disk shape with its rotation axis in the left-right direction, and is fixed to the center in the left-right direction of the rotating member 34. This allows the pinion gear 36 to rotate together with the rotating member 34. In addition, gear teeth are formed on the outer periphery of the pinion gear 36, and these gear teeth mesh with the gear teeth of the rack 32.

[0030] 4, a biasing member 40 is provided between the base portion 30 and the rack 32. The biasing member 40 is, for example, a compression coil spring, and biases the rack 32 forward.

[0031] (Actions and Effects of This Embodiment) Next, the operation and effects of this embodiment will be described.

[0032] As shown in FIG. 1, in the vehicle seat 10 of the present embodiment described above, the buttocks, back and head of a seated occupant are supported by the seat cushion 12, seat back 14 and headrest 16, respectively.

[0033] 2 shows the headrest 16 in a state before the central support portion 26 is pressed by the head of a seated occupant. As shown in this figure, before the central support portion 26 is pressed by the head of a seated occupant, the front of the central support portion 26 and the front of the pair of left and right lateral support portions 28 are in substantially the same front-to-rear position. Furthermore, before the central support portion 26 is pressed by the head of a seated occupant, the central support portion 26 and the pair of left and right lateral support portions 28 are spaced apart in the left-to-right direction.

[0034] As shown in Figures 4, 5 and 6, when the head of a seated occupant presses the lower portion 26B of the central support portion 26 toward the rear, the lower portion 26B of the central support portion 26 and the rack 32 are displaced toward the rear against the biasing force of the biasing member 40.

[0035] When the rack 32 is displaced rearward, the pinion gear 36 meshing with the rack 32 rotates to one side together with the rotating member 34. As a result, the left nut 38 threaded onto the left portion 34A of the rotating member 34 is displaced rightward along the rotating member 34, and the right nut 38 threaded onto the right portion 34B of the rotating member 34 is displaced leftward along the rotating member 34. As a result, the pair of left and right side support portions 28 are displaced toward the central support portion 26. As a result, the head of the seated occupant is supported from the rear by the central support portion 26 and is supported from the left and right by the pair of left and right side support portions 28. This effectively reduces lateral shaking of the head of the seated occupant, thereby effectively reducing motion sickness.

[0036] 2, 3, and 4, when the head of the seated occupant moves away from the headrest 16 (central support portion 26), the rack 32 is displaced forward by the biasing force of the biasing member 40. As a result, the central support portion 26 is displaced forward. Furthermore, as the rack 32 is displaced forward by the biasing force of the biasing member 40, the pinion gear 36 meshing with the rack 32 rotates to the other side together with the rotating member 34. As a result, the left nut 38 threadedly engaged with the left portion 34A of the rotating member 34 is displaced leftward along the rotating member 34, and the right nut 38 threadedly engaged with the right portion 34B of the rotating member 34 is displaced rightward along the rotating member 34. As a result, the pair of left and right side support portions 28 are displaced toward the opposite side from the central support portion 26. In this manner, in this embodiment, when the head of the seated occupant moves away from the central support portion 26, the central support portion 26 and the pair of left and right side support portions 28 can be returned to their original positions.

[0037] In this embodiment, an example in which the biasing member 40 is provided between the base portion 30 and the rack 32 has been described, but the present invention is not limited to this. The biasing member 40 may be provided at a position other than the above-mentioned position as long as it can return the central support portion 26 and the pair of left and right side support portions 28 to their original positions. For example, a biasing member 40 such as a spiral spring that rotates the rotating member 34 to the other side may be provided at a position other than the above-mentioned position.

[0038] Furthermore, in the present embodiment, an example has been described in which the interlocking displacement part 22 is configured with the base part 30, the rack 32, the rotating member 34, the pinion gear 36, the pair of left and right nuts 38, and the biasing member 40, but the present invention is not limited to this. For example, it is also possible to apply an interlocking displacement part 22 with a different configuration that allows the central support part 26 to be displaced rearward when the central support part 26 is pressed by the head of a seated occupant and that is capable of displacing each of the pair of left and right side support parts 28 toward the central support part 26.

[0039] In addition, in this embodiment, an example has been described in which the rack 32 is configured to displace in the front-rear direction together with the lower portion 26B of the central support portion 26, but the present invention is not limited to this. For example, the rack 32 may be configured to displace in the front-rear direction together with the entire central support portion 26. Also, the rack 32 may be configured to displace in the front-rear direction together with the upper portion 26B of the central support portion 26.

[0040] The above describes one embodiment of the present invention, but the present invention is not limited to the above, and it goes without saying that it can be implemented in various other modified forms within the scope of the gist of the present invention. [Explanation of symbols]

[0041] 10 Vehicle seats 12 seat cushions 14 Seat back 16 Headrest 22 Interlocking displacement section 26 Central support 28 Lateral support part 32 rack (first displacement member) 34 Rotating member 38 Nut (second displacement member) 40 biasing member

Claims

1. a central support portion that is disposed opposite the head of the seated occupant in the front-rear direction of the seat and supports the head of the seated occupant from the rear side of the seat; a pair of left and right side support portions disposed on the left and right sides of the seat with respect to the central support portion; an interlocking displacement portion that, when the central support portion is pressed by the head of the seated occupant, allows the central support portion to be displaced toward the opposite side of the head of the seated occupant and displaces each of the pair of left and right side support portions toward the center portion in the left-right direction of the seat; Headrest with.

2. 2. The headrest according to claim 1, further comprising a biasing member that displaces the central support portion toward the head of the seated occupant and displaces the pair of left and right side support portions to both sides in the left-right direction of the seat.

3. The interlocking displacement portion is a first displacement member supported so as to be displaceable together with the central support portion; a rotating member that rotates as the first displacement member is displaced; a pair of left and right second displacement members that are engaged with the rotating member, are displaceable together with the pair of left and right side support portions, and displace along the rotation axis direction of the rotating member together with the pair of left and right side support portions as the rotating member rotates; The headrest of claim 1 , comprising:

4. The seat cushion further includes a biasing member that displaces the first displacement member toward the head side of the seated occupant, The headrest of claim 3, wherein when the first displacement member is displaced toward the head of the seated occupant by the biasing member, the central support portion is displaced toward the head of the seated occupant and the pair of left and right lateral support portions are displaced to both sides of the seat in the left-right direction.

5. a seat cushion that supports the buttocks of a seated occupant from below the seat; a seat back that supports the back of a seated occupant from the rear side of the seat; a headrest that supports the head of a seated occupant; Equipped with The headrest is a central support portion that is disposed opposite the head of the seated occupant in the front-rear direction of the seat and supports the head of the seated occupant from the rear side of the seat; a pair of left and right side support portions disposed on the left and right sides of the seat with respect to the central support portion; an interlocking displacement portion that, when the central support portion is pressed by the head of the seated occupant, allows the central support portion to be displaced toward the opposite side of the head of the seated occupant and displaces each of the pair of left and right side support portions toward the center portion in the left-right direction of the seat; A vehicle seat comprising:

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