Headrest and vehicle seat

Abstract

To obtain a headrest which can correspond to variations of a height position of a head of a seated occupant over a wide range with a simple configuration and a vehicular seat including the headrest.SOLUTION: In a first pillow section 30, the lower section front surface is recessed to a seat rear side. A second pillow section 34 is made movable between a position arranged adjacently to a seat front side with respect to the lower section front surface of the first pillow section 30 and a position on the lower side. A guide mechanism 48 has a hinge pin 60 and a slide plate 50. The hinge pin 60 is provided movably and integrally with the second pillow section 34 and has a seat width direction as an axial direction. The slide plate 50 is mounted in the first pillow section 30 and has a groove-like section 52 which guides the hinge pin 60 along a seat vertical direction. In the groove-like section 52 of the slide plate 50, wide sections 54 and narrow sections 56 are alternately provided.SELECTED DRAWING: Figure 2

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 for a vehicle seat that includes an upper pillow section that forms the upper front side and a lower pillow section that forms the lower front side. In this headrest, in order to reduce the strain on the neck caused by the weight of the seated occupant's head, the lower pillow section is adjustable in its front-to-rear position, and the amount of protrusion of both side sections in the seat width direction is also adjustable, as well as its up-and-down position. As a result, in this headrest, the lower pillow section can support the seated occupant's head from below over a wide range. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-206229 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the lower pillow portion of the above-mentioned prior art is intended to support the head of a seated occupant over a wide area from below, but it is also possible to some extent to support the head of a small seated occupant, for example.

[0005] However, in the above-mentioned prior art, the vertical position adjustment function is provided in part of the rotating part for adjusting the front-rear position of the lower pillow, which makes the structure complicated and does not allow for a sufficiently wide range of adjustment for the vertical position of the lower pillow. Therefore, there is room for improvement in order to widely accommodate variations in the height position of the head of seated occupants.

[0006] In consideration of the above, the present invention aims to provide a headrest with a simple configuration that can accommodate a wide range of variations in the height position of the head of a seated occupant, and a vehicle seat equipped with such a headrest. [Means for solving the problem]

[0007] The headrest of the present invention described in claim 1 comprises: a first pillow portion adapted to support the head of a seated occupant and having a lower front surface recessed toward the rear of the seat; a second pillow portion adapted to support the head of a seated occupant and movable between a first position arranged adjacent to the lower front surface of the first pillow portion on the front side of the seat and a second position arranged below the first position; a guide mechanism that guides the second pillow portion slidably between the first position and the second position, the guide mechanism comprising: a hinge pin arranged to be movable integrally with the second pillow portion and having an axial direction in the seat width direction; and a guide member attached to the first pillow portion and having a groove-like portion that guides the hinge pin in the seat up-down direction, wherein the groove-like portion has wide portions having a width corresponding to the width of the hinge pin and narrow portions narrower than the hinge pin alternately arranged along the seat up-down direction, and the narrow portions are elastically deformable to a width that allows the hinge pin to pass through.

[0008] According to the above configuration, both the first pillow section and the second pillow section are configured to support the head of a seated occupant. The lower front surface of the first pillow section is recessed toward the rear of the seat, and the second pillow section is movable between a first position adjacent to the lower front surface of the first pillow section on the front side of the seat, and a second position below the first position. The guide mechanism includes a hinge pin and a guide member, and guides the second pillow section to be slidable between the first and second positions. The hinge pin is provided movably integrally with the second pillow section and has its axis aligned with the seat width direction. The guide member is attached to the first pillow section and guides the hinge pin along the seat up-down direction using a groove-shaped portion. Therefore, by increasing the length of the groove-shaped portion in the guide direction, the range of movement of the second pillow section in the seat up-down direction can be increased.

[0009] Here, the groove-shaped portion has wide portions having a width corresponding to the width of the hinge pin and narrow portions narrower than the hinge pin, which are arranged alternately along the up-down direction of the seat, and the narrow portions are elastically deformable so as to have a width that allows the hinge pin to pass through. As a result, despite the simple configuration, when the hinge pin is placed in the wide portion, the sliding of the hinge pin is locked and the position of the second pillow portion is maintained, while when a force of a predetermined value or more is applied to the second pillow portion in the up-down direction of the seat, the hinge pin slides while elastically deforming the narrow portion, allowing the second pillow portion to move.

[0010] Furthermore, when the hinge pin is positioned in the wide portion of the groove of the guide member, it is possible to rotate the second pillow portion around the axis of the hinge pin. In addition, since the present invention is not configured so that the guide member is provided as a target for such rotation, there are fewer restrictions on setting the length of the guide member in the guiding direction compared to a configuration in which the guide member is provided as a target for rotation.

[0011] The headrest of the present invention described in claim 2 has the configuration described in claim 1, and has a pair of left and right side portions including a portion that extends upward from a portion that is continuous with the second pillow portion on the outer side in the seat width direction and is positioned on the outer side in the seat width direction with respect to the first pillow portion, and the guide members are provided in pairs on the left and right side sides of the first pillow portion, and the hinge pins are attached to the upper portions of the pair of left and right side portions, respectively.

[0012] According to the above configuration, the guide members are provided in pairs on the left and right side portions of the first pillow portion, so the length of each guide member in the guide direction in the groove-shaped portion can be easily ensured. Also, the hinge pins are attached to the upper portions of the pair of left and right side portions that are provided continuously with the second pillow portion, so the range over which the hinge pins can slide within the groove-shaped portion toward the seat bottom can be extended. As a result, the range over which the second pillow portion can be moved toward the seat bottom from the first position can be widened.

[0013] The headrest of the present invention described in claim 3 has the configuration described in claim 1 or claim 2, and has holes formed on both sides of the guide member on the widthwise outer side of the narrow portion, which allow the narrow portion to elastically deform outward in the widthwise direction.

[0014] According to the above configuration, when a force along the up-down direction of the seat is applied to the second pillow portion and the narrow portion is elastically deformed outward in the width direction by the hinge pin, the narrow portion elastically deforms toward the space of the hole, which makes it easier to design the narrow portion to elastically deform with an appropriate force.

[0015] The headrest of the present invention described in claim 4 has the configuration described in claim 3, in which a first groove edge portion that forms the edge of the narrow width portion and is the portion between the narrow width portion and the hole portion is set to have a smaller dimension in the same direction as the width direction of the groove-shaped portion than a second groove edge portion that forms the edge of the wide width portion and is the portion between the hole portions that are adjacent to each other in the guide direction of the groove-shaped portion.

[0016] According to the above configuration, the first groove edge portion that forms the edge of the narrow width portion is set to have a smaller dimension in the same direction as the width direction of the groove-shaped portion than the second groove edge portion that forms the edge of the wide width portion, so that the narrow width portion can be easily elastically deformed with an appropriate force.

[0017] The vehicle seat of the present invention described in claim 5 includes the headrest according to any one of claims 1 to 4 and a seat back that supports the back of a seated occupant, and a headrest stay for connecting the headrest to the upper end side of the seat back is provided in the first pillow portion, and is configured so that the second pillow portion is positioned in the first position when the hinge pin is positioned in the uppermost wide portion of the groove-shaped portion, and is configured so that the entire second pillow portion overlaps with the seat back in a front view of the seat when the hinge pin is positioned in the second wide portion from the top of the groove-shaped portion with the headrest stay inserted deepest into the seat back.

[0018] According to the above configuration, when the hinge pin is disposed in the uppermost wide portion of the groove, the second pillow portion is disposed in the first position. Also, when the hinge pin is disposed in the second widest portion from the top of the groove with the headrest stay inserted deepest into the seat back, the second pillow portion is disposed in a position where the entire second pillow portion overlaps the seat back in a front view of the seat. Therefore, even if a large load is input from the head of a seated occupant to the second pillow portion during a collision, the head can be stably supported. [Effects of the Invention]

[0019] As described above, the present invention has the excellent effect of being able to accommodate a wide range of variations in the height position of the head of a seated occupant with a simple configuration. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a perspective view showing a vehicle seat according to an embodiment of the present invention; [Figure 2] 2 is a perspective view showing a part of the internal structure from the headrest to the upper part of the seat back in FIG. 1. FIG. [Figure 3] 3 is a perspective view showing a part of the internal structure of the headrest of FIG. 2, as viewed from a different direction from that of FIG. 2. FIG. [Figure 4] 1. FIG. 4 is a schematic side view for explaining a state in which the second pillow portion in FIG. 1 has been moved downward from the first position. [Figure 5] FIG. 3 is a front view of the slide plate of FIG. 2. [Figure 6A] 2 is a perspective view showing a state in which the second pillow portion of FIG. 1 is rotated. FIG. [Figure 6B] 2 is a perspective view showing a state in which a second pillow portion in FIG. 1 is slid downward. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0021] A vehicle seat having a headrest according to one embodiment of the present invention will be described with reference to Figures 1 to 6B. Note that in these figures, the arrow FR indicates the front side of the seat, the arrow UP indicates the upper side of the seat, and the arrow W indicates the seat width direction (left-right direction of the seat).

[0022] 1 is a perspective view of a vehicle seat 10 according to this embodiment. The vehicle seat 10 includes a seat cushion 12 (only a portion of which is shown in the figure) that supports the buttocks and thighs of a seated occupant, a seat back 14 that supports the back of the seated occupant, and a headrest 16 that supports the head of the seated occupant.

[0023] Fig. 2 shows a perspective view of part of the internal structure from the headrest 16 to the upper part of the seatback 14. In Fig. 2, part of the outline of the front side of the headrest 16 and part of the outline of the upper part of the seatback 14 are indicated by two-dot chain lines. As shown in Fig. 2, the seatback 14 is configured such that a back pad (not shown) which is a cushioning material is placed over a back frame 20 which is a framework member, and the surface of the back pad is covered with a trim cover 22 (see Fig. 1) which is an upholstery material. A pair of left and right headrest supports 24 for connecting the headrest 16 are attached to the upper end of the back frame 20.

[0024] As shown in FIG. 1 , the headrest 16 includes a first pillow portion 30 and a movable portion 32 formed in a generally U-shape and including a second pillow portion 34 located below the front surface of the first pillow portion 30 when viewed from the front of the seat. Both the first pillow portion 30 and the second pillow portion 34 are intended to support the head of a seated occupant. The first pillow portion 30 constitutes a part of the middle portion of the headrest 16 in the seat width direction, and its lower front surface 30A is recessed toward the rear of the seat. The second pillow portion 34 is configured to be movable between a first position 34X located adjacent to the lower front surface 30A of the first pillow portion 30 on the seat front side, and a second position 34Y (shown by a two-dot chain line) located below the first position 34X. The movable portion 32, which includes the second pillow portion 34, has a pair of left and right side portions 36 that extend upward from portions connected to the outer side of the second pillow portion 34 in the seat width direction and include portions located outward in the seat width direction from the first pillow portion 30. The pair of left and right side portions 36 are shaped to bulge out toward the front of the seat.

[0025] The first pillow portion 30 includes a stay assembly 40 (see FIG. 2 ) that serves as a frame (skeletal member), a padding material (not shown) that serves as a cushioning material, and a trim cover 46 that serves as a skin material. FIG. 3 is a perspective view of a portion of the internal structure of the headrest 16, viewed from a different direction than that of FIG. 2 . As shown in FIGS. 2 and 3 , the stay assembly 40 includes a headrest stay 42 and a bracket 44. The headrest stay 42 is formed into a substantially inverted U-shape by, for example, bending a metal pipe. As shown in FIG. 2 , the headrest stay 42 is a member that connects the headrest 16 to the upper end side of the seat back 14. That is, the headrest stay 42 has a pair of left and right leg portions 42A extending downward, which are connected to the upper end portion of the back frame 20 via a pair of left and right headrest supports 24, and is supported so that its vertical position can be adjusted relative to the back frame 20.

[0026] 2 and 3, the bracket 44 is formed, for example, by press-forming a metal plate, and is fixed by means of welding or the like to the left-right extending portion 42B and the upper end portions of the left and right leg portions 42A that constitute the upper end portion of the headrest stay 42. The front plate portion 44A extending left and right in the bracket 44 is positioned forward of the left and right leg portions 42A of the headrest stay 42, and holds a padding material (not shown).

[0027] A striker 78 is fixed to the front surface of the front plate portion 44A of the bracket 44 at a middle portion in the seat width direction. The striker 78 is formed by bending a wire and is generally U-shaped in a front view of the seat and generally L-shaped in a side view of the seat. Mounting portions 78A on both end sides of the striker 78 each extend in the up-down direction of the seat and are fixed to the front plate portion 44A. The configuration of the peripheral portion on the front end side of the striker 78 will be described later.

[0028] The outer end of the front plate 44A of the bracket 44 in the seat width direction is bent so as to convex toward the front of the seat, and is integrally formed with an angular guide plate 44B that extends toward the rear of the seat and in the seat up-down direction. The portion of the guide plate 44B that is above the front plate 44A is longer than the portion that is below the front plate 44A. The guide plate 44B is disposed with its thickness direction aligned with the seat width direction. A guide hole 44H is formed through the guide plate 44B, penetrating in the thickness direction and extending along the seat up-down direction.

[0029] A slide plate 50 serving as a guide member having substantially the same outer shape as the guide plate 44B is superimposed on the outer side of the guide plate 44B in the seat width direction. The upper and lower ends of the guide plate 44B and the slide plate 50 are fastened and fixed with screws 49A and nuts 49B. The slide plates 50 fixed in this manner are made of resin (e.g., polyacetal (POM)) and are provided in pairs on the left and right side portions of the first pillow portion 30 (see FIG. 2). The slide plates 50 will be described in detail later. The slide plates 50 and the guide plate 44B are penetrated from the outer side in the seat width direction by a hinge pin 60. The hinge pin 60 is attached to the upper portions of the pair of left and right side portions 36 (see FIG. 2), respectively, and has its axis aligned with the seat width direction.

[0030] The hinge pin 60 has a male thread (not shown) formed on the outer peripheral surface of the base end of the shaft, and is screwed into a weld nut 62 fixed to one end of a mounting bracket 64. A head 61 is integrally formed on one axial end of the hinge pin 60, and the head 61 is arranged outward in the seat width direction from the weld nut 62. The mounting bracket 64 has an end opposite to the side where the weld nut 62 is fixed, which extends toward the front of the seat in a side view of the seat, and the front end side is arranged on the inner surface side in the seat width direction of the side portion 36 of the movable part 32.

[0031] The front ends of the pair of left and right mounting brackets 64 are connected to each other by a frame body 70. The frame body 70 constitutes the framework of the movable section 32 (see FIG. 2), is formed in a generally U-shape when viewed from the front of the seat, and includes a pair of left and right pipe members 72 fixed to the front ends of the mounting brackets 64, and a connecting member 74 that connects the ends of the pair of left and right pipe members 72 in the seat width direction. The pair of left and right pipe members 72 are formed symmetrically and curve from the front end side of the mounting brackets 64 outward in the seat width direction toward the lower side of the seat, then extend downward toward the seat, and further have their lower ends bent inward in the seat width direction so as to approach each other. The connecting member 74 is generally U-shaped when viewed from the front of the seat, and side wall portions 74A on both sides are joined to the ends of the pipe members 72.

[0032] A support shaft 75 is attached to one side of a pair of left and right side wall portions 74A of the connecting member 74. The support shaft 75 is disposed with its axis directed in the seat width direction and supports a latch 76. As shown in FIG. 3, the latch 76 is formed in a generally V-shape when viewed from the side of the seat, and an engagement recess (not shown) formed on the lower side of one arm portion 76A is capable of engaging with a left-right extending portion 78B of the striker 78 from above. The latch 76 is rotatable about the support shaft 75 between a latched position (a position where it engages with the striker 78) shown in FIG. 3 and an unlatched position (a position not shown where it does not engage with the striker 78) in which the protruding tip side of one arm portion 76A faces upward, and is biased by a spring 77 toward the latched position shown in FIG. 3.

[0033] The tip side of a release lever 80 is disposed on the seat front side of the other half 76B of the latch 76. The release lever 80 is disposed on the bottom wall 74B of the connecting member 74 so that the thickness direction of its general portion is in the seat up-down direction, and the portion of the base end on the seat rear side is attached to the bottom wall 74B so as to be rotatable about a rotation shaft 81 in the seat up-down direction. The portion of the base end of the release lever 80 on the seat front side is bent so as to face the seat width direction, and is connected to an unlock button 84 via a shaft-shaped member 82. The unlock button 84 is provided on the lower side of the side of the movable part 32 (see FIG. 2).

[0034] In this embodiment, when the lock release button 84 is pressed, the release lever 80 rotates, and the latch 76 is placed in the unlatched position (a position where it does not engage with the striker 78). In this state, the movable part 32 shown in FIG. 1 can be rotated about the axis of the hinge pin 60 to the state shown in FIG. 6A. In addition, when the occupant pushes the movable part 32 in the state shown in FIG. 6A toward the rear of the seat, the movable part 32 can be returned to the state shown by the solid line in FIG. 1 and the state shown in FIG. 3.

[0035] Next, the guide mechanism 48 shown in FIG. 2 and including the hinge pin 60, the slide plate 50, and the guide plate portion 44B will be described in detail.

[0036] As is clear from the above description, the hinge pin 60 is connected to the frame body 70 via a weld nut 62 and a mounting bracket 64, and is provided so as to be movable integrally with the second pillow portion 34. The guide mechanism 48, which includes the hinge pin 60, the slide plate 50, and the guide plate portion 44B, is a mechanism for guiding the second pillow portion 34 shown in Fig. 1 so that it can slide between the first position 34X and the second position 34Y. The width of the guide hole 44H of the guide plate portion 44B shown in Fig. 2 is set to be slightly wider than the width of the hinge pin 60.

[0037] Fig. 4 shows a schematic side view for explaining a state in which the second pillow portion 34 has been moved downward from the first position 34X. As shown in Fig. 4, the slide plate 50 is attached to the first pillow portion 30 and is disposed with its longitudinal direction aligned with the seat vertical direction. Although not shown, a slit (not shown) is formed in the trim cover 46 of the first pillow portion 30 so as to correspond to the widthwise center line CL of the slide plate 50, allowing the hinge pin 60 to move up and down.

[0038] FIG. 5 shows a front view of the slide plate 50. As shown in FIG. 5, the slide plate 50 has a groove-like portion 52 that guides the hinge pin 60 in the up-down direction of the seat. The groove-like portion 52 has wide portions 54 having a width corresponding to the width of the hinge pin 60 and narrow portions 56 that are narrower than the hinge pin 60, which are alternately arranged in the up-down direction of the seat. The narrow portions 56 are elastically deformable so as to have a width that allows the hinge pin 60 to pass through. The uppermost narrow portion 56 (56F) of the multiple narrow portions 56 extends in the guiding direction of the groove-like portion 52, and the second narrowest and subsequent narrow portions 56 (56E) are formed in an arc shape so as to narrow the width of the groove-like portion 52 in a front view.

[0039] Furthermore, holes 58 that allow the narrow width portion 56 to elastically deform outward in the width direction are formed through the slide plate 50 on both sides of the narrow width portion 56 on the outer side in the width direction. The uppermost hole 58 (58F) of the plurality of holes 58 is formed in a generally isosceles trapezoidal shape with its base on the side opposite the narrow width portion 56 in a front view and extends along the guide direction of the groove-shaped portion 52, while the second and subsequent hole portions 58 (56E) from the top are formed in a D-shape with an arc-shaped portion on the narrow width portion 56 side in a front view. Furthermore, a first groove edge 56A that constitutes the edge of the narrow width portion 56 and is the portion between the narrow width portion 56 and the hole 58 has a smaller dimension (i.e., a thinner thickness) in the same direction as the width direction of the groove-shaped portion 52 than a second groove edge 54A that constitutes the edge of the wide width portion 54 and is the portion between adjacent hole portions 58 in the guide direction of the groove-shaped portion 52.

[0040] When the hinge pin 60 is disposed in the uppermost wide portion 54 (54F) of the groove-shaped portion 52, the second pillow portion 34 is disposed in the first position 34X as shown in FIG. 1. When the hinge pin 60 is disposed in the second wide portion 54 (54S) from the top of the groove-shaped portion 52 as shown in FIG. 5 with the headrest stay 42 as shown in FIG. 2 inserted deepest into the seat back 14, the entire second pillow portion 34 as shown in FIG. 6B is disposed in a position overlapping with the seat back 14 in a front view of the seat. In other words, the groove-shaped portion 52 as shown in FIG. 5 can be used to position the movable portion 32 as shown in FIG. 6B etc. in the up-down direction. In FIG. 4, the state in which the entire second pillow portion 34 overlaps with the seat back 14 is indicated by a two-dot chain line.

[0041] (Actions and Effects) Next, the operation and effects of the above embodiment will be described.

[0042] The first pillow section 30 and the second pillow section 34 shown in FIG. 1 are both designed to support the head of a seated occupant. The lower front surface 30A of the first pillow section 30 is recessed toward the rear of the seat, and the second pillow section 34 is movable between a first position 34X, which is adjacent to the lower front surface 30A of the first pillow section 30 on the seat front side, and a second position 34Y, which is located below the first position 34X. A guide mechanism 48 shown in FIG. 2 includes a hinge pin 60 and a slide plate 50 and guides the second pillow section 34 shown in FIG. 1 to slide between the first position 34X and the second position 34Y. The hinge pin 60 shown in FIG. 4 is provided movably integrally with the second pillow section 34 and has its axis aligned with the seat width direction. The slide plate 50 is attached to the first pillow section 30 and guides the hinge pin 60 in the seat up-down direction via a groove portion 52 shown in FIG. 5. Therefore, by increasing the length of the groove-like portion 52 in the guide direction, the range of movement of the second pillow portion 34 shown in FIG. 1 and the like in the up-down direction of the seat can be increased.

[0043] As shown in FIG. 5 , the groove 52 has wide portions 54 having a width corresponding to the width of the hinge pin 60 and narrow portions 56 narrower than the hinge pin 60, which are alternately arranged along the up-down direction of the seat. The narrow portions 56 are elastically deformable to a width that allows the hinge pin 60 to pass through. This allows for a simple configuration, but when the hinge pin 60 is placed in the wide portion 54, the sliding of the hinge pin 60 is locked, and the position of the second pillow portion 34 shown in FIG. 1 and the like is maintained. This prevents or effectively suppresses the second pillow portion 34 from accidentally returning to its original position. Meanwhile, when a force equal to or greater than a predetermined value is applied to the second pillow portion 34 along the up-down direction of the seat, the hinge pin 60 shown in FIG. 5 slides while elastically deforming the narrow portions 56, thereby moving the second pillow portion 34 (see FIG. 1 and the like).

[0044] Furthermore, when the hinge pin 60 is disposed in the wide portion 54 of the groove portion 52 of the slide plate 50, it is possible to rotate the second pillow portion 34 (see FIG. 1, etc.) around the axis of the hinge pin 60. In this embodiment, a guide member is not provided on the target of such rotation, and therefore there are fewer restrictions on setting the length of the slide plate 50, which is the guide member, in the guide direction, compared to a configuration in which a guide member is provided on the target of rotation.

[0045] In this embodiment, the slide plates 50 shown in Fig. 4 are provided in pairs on the left and right side portions of the first pillow portion 30. This makes it easy to ensure the length of each slide plate 50 in the guide direction in the groove-like portion 52 (see Fig. 5). Furthermore, the hinge pins 60 are attached to the upper portions of the pair of left and right side portions 36 provided continuously with the second pillow portion 34, respectively, so that the range over which the hinge pins 60 can slide toward the seat lower side within the groove-like portion 52 shown in Fig. 5 can be extended. As a result, the range over which the second pillow portion 34 shown in Fig. 1 can be moved toward the seat lower side from the first position 34X can be widened.

[0046] 5, in the present embodiment, the slide plate 50 has through-holes 58 formed on both sides of the narrow width portion 56 on the outer side in the width direction thereof, the through-holes 58 allowing the narrow width portion 56 to elastically deform outward in the width direction. Therefore, when a force along the seat up-down direction is applied to the second pillow portion 34 (see FIG. 1) to elastically deform the narrow width portion 56 outward in the width direction by the hinge pin 60, the narrow width portion 56 elastically deforms toward the space of the hole 58. This makes it easier to design the narrow width portion 56 to elastically deform with an appropriate force.

[0047] Furthermore, in this embodiment, the first groove edge 56A, which constitutes the edge of the narrow width portion 56 and is the portion between the narrow width portion 56 and the hole 58, is set to have a smaller dimension in the same direction as the width direction of the groove-shaped portion 52 than the second groove edge 54A, which constitutes the edge of the wide width portion 54 and is the portion between the hole portions 58 adjacent to each other in the guide direction of the groove-shaped portion 52. Therefore, it is possible to easily achieve elastic deformation of the narrow width portion 56 with an appropriate force.

[0048] In this embodiment, when the hinge pin 60 is disposed in the uppermost wide portion 54 (54F) in the groove-shaped portion 52, the second pillow portion 34 is disposed in the first position 34X as shown in Fig. 1. When the hinge pin 60 is disposed in the second wide portion 54 (54S) from the top in the groove-shaped portion 52 as shown in Fig. 5 with the headrest stay 42 as shown in Fig. 2 inserted deepest into the seat back 14, the entire second pillow portion 34 as shown by the two-dot chain line in Fig. 4 is disposed in a position overlapping with the seat back 14 in a front view of the seat. Therefore, even if a large load is input from the head H of a small seated occupant P to the second pillow portion 34 during a collision, the head H can be stably supported.

[0049] As described above, the vehicle seat 10 having the headrest 16 of this embodiment shown in Figures 1 to 6B can accommodate a wide range of variations in the height position of the head of a seated occupant with a simple configuration. As a result, even when a short occupant P, such as a petite woman, is seated, the head H can be supported by the second pillow portion 34. Furthermore, the head of an occupant in a comfortable position (an occupant with their back tilted) seated in a reclined seat back 14 can also be supported by the second pillow portion 34. The second pillow portion 34 can also support the neck of the seated occupant. Furthermore, the simple configuration makes it possible to reduce the number of parts.

[0050] [Supplementary explanation of the embodiment] In the above embodiment, the slide plates 50 are provided in pairs on the left and right side portions of the first pillow portion 30. However, as a variation of the above embodiment, for example, a configuration in which a pair of guide members (slide plates 50) are provided on the left and right sides at the rear of the first pillow portion (30) in the seat front-rear direction and in the middle of the seat width direction, and the hinge pin (60) is guided by the groove-shaped portion (52) of such guide members (slide plates 50) can also be adopted.

[0051] Furthermore, in the above embodiment, holes 58 are formed through the slide plate 50 as a guide member on both sides of the narrow portion 56 on the outer side in the width direction, and this configuration is preferable, but it is also possible to adopt a configuration in which the narrow portion of the guide member is formed of, for example, rubber, and no holes are provided on both sides of the narrow portion on the outer side in the width direction.

[0052] As a modification of the above embodiment, the first groove edge portion (56A) may be smaller than the second groove edge portion (54A) in the same direction as the width direction of the groove-shaped portion (52), which is not a dimensional relationship.

[0053] Furthermore, as a modified example of the above embodiment, when the headrest stay (42A) is inserted deepest into the seat back (14) and the hinge pin (60) is positioned in the second widest portion (54 (54S)) from the top of the groove-shaped portion (52), a large portion of the second pillow portion (34) is positioned so as to overlap the seat back (14) when viewed from the front of the seat.

[0054] The above-described embodiment and the above-described modifications can be implemented in appropriate combinations.

[0055] The above describes one example of the present invention, but the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms within the scope of the gist of the present invention. [Explanation of symbols]

[0056] 10 Vehicle seats 14 Seat back 16 Headrest 30 First pillow part 30A lower front 34 Second pillow part 34X 1st position 34Y 2nd position 36 Side part 42 Headrest stay 48 Guide mechanism 50 Slide plate (guide member) 52 Groove 54 Wide section 54A Second groove edge 54F Top wide part 54S The second widest part from the top 56 Narrow part 56A First groove edge 58 Hole 60 hinge pin

Claims

1. a first pillow portion for supporting the head of a seated occupant, the lower front surface of which is recessed toward the rear of the seat; a second pillow portion adapted to support the head of a seated occupant and movable between a first position disposed adjacent to the front surface of the lower portion of the first pillow portion on the seat front side and a second position disposed below the first position; a guide mechanism that guides the second pillow portion slidably between the first position and the second position, and includes a hinge pin that is provided to be movable integrally with the second pillow portion and has an axial direction in the seat width direction, and a guide member that is attached to the first pillow portion and has a groove-shaped portion that guides the hinge pin along the seat up-down direction; and The groove-shaped portion has wide portions having a width corresponding to the width of the hinge pin and narrow portions having a width narrower than the hinge pin, which are arranged alternately along the vertical direction of the seat, and the narrow portions are elastically deformable so as to have a width that allows the hinge pin to pass through.

2. a pair of left and right side portions including a portion extending upward from a portion continuing outward in the seat width direction relative to the second pillow portion and disposed outward in the seat width direction relative to the first pillow portion; The guide members are provided in pairs on the left and right side portions of the first pillow portion, The headrest according to claim 1 , wherein the hinge pins are attached to upper portions of the pair of left and right side portions, respectively.

3. 3. The headrest according to claim 1, wherein the guide member has holes formed therethrough on both sides of the narrow portion on the outer side in the width direction thereof, the holes allowing the narrow portion to elastically deform outward in the width direction thereof.

4. A headrest as described in claim 3, wherein a first groove edge portion, which forms an edge of the narrow width portion and is the portion between the narrow width portion and the hole portion, is set to have a smaller dimension in the same direction as the width direction of the groove-shaped portion than a second groove edge portion, which forms an edge of the wide width portion and is the portion between the hole portions adjacent to each other in the guide direction of the groove-shaped portion.

5. A headrest according to any one of claims 1 to 4; a seat back that supports the back of a seated occupant; Equipped with a headrest stay for connecting the headrest to an upper end side of the seat back is provided on the first pillow portion; When the hinge pin is disposed in the uppermost wide portion of the groove-shaped portion, the second pillow portion is configured to be disposed in the first position, and The vehicle seat is configured so that when the headrest stay is inserted deepest into the seat back and the hinge pin is positioned in the second widest portion from the top in the groove-shaped portion, the entire second pillow portion is positioned in a position overlapping the seat back when viewed from the front of the seat.

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