JP7719027B2 - Headrest and vehicle seat - Google Patents

Description

The present invention relates to a headrest and a vehicle seat.

Patent Document 1 below discloses a headrest for a vehicle seat, comprising an upper pillow section that forms the upper front side and a lower pillow section that forms the lower front side. In this headrest, to reduce the strain on the neck caused by the weight of the seated occupant's head, the lower pillow section is adjustable in both front and rear positions, and the amount of projection on both sides in the seat width direction is also adjustable, as well as the vertical position. As a result, in this headrest, the lower pillow section is able to support the seated occupant's head from below over a wide area.

Japanese Patent Application Laid-Open No. 2019-206229

The lower pillow section of the above-mentioned prior art is designed to support the head of a seated occupant over a wide area from below, but it is also capable of supporting the head of a small seated occupant to some extent.

However, in the above prior art, the vertical position adjustment function is provided on part of the rotating part that adjusts the fore-and-aft position of the lower pillow, resulting in a complex structure and not being able to provide a sufficiently wide range of adjustment for the vertical position of the lower pillow. Therefore, there is room for improvement in order to accommodate a wide range of variations in the height position of the head of seated occupants.

In consideration of the above, the present invention aims to provide a headrest with a simple structure 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.

The headrest of the present invention described in claim 1 comprises: a first pillow section adapted to support the head of a seated occupant, the lower front surface of which is recessed toward the rear of the seat; a second pillow section adapted to support the head of a seated occupant, movable between a first position positioned adjacent to the lower front surface of the first pillow section toward the front of the seat and a second position positioned below the first position; a guide mechanism that guides the second pillow section slidably between the first position and the second position, the guide mechanism comprising: a hinge pin that is movable integrally with the second pillow section and has its axial direction in the seat width direction; and a guide member that is attached to the first pillow section and has a groove-like portion that guides the hinge pin in the seat up-down direction. The groove-like portion has wide portions that correspond to the width of the hinge pin and narrow portions that are narrower than the hinge pin, which are arranged alternately in the seat up-down direction. The narrow portions are elastically deformable so as to have a width that allows the hinge pin to pass through.

According to the above configuration, both the first pillow section and the second pillow section are designed 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, where it is adjacent to the lower front surface of the first pillow section on the front side of the seat, and a second position, where it is positioned below the first position. The guide mechanism includes a hinge pin and a guide member, and guides the second pillow section so that it can slide between the first and second positions. The hinge pin is movably provided integrally with the second pillow section and has its axial direction aligned with the seat width direction. The guide member is attached to the first pillow section and guides the hinge pin in the up-down direction of the seat 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 up-down direction of the seat can be increased.

The groove-shaped portion has wide sections whose width corresponds to the width of the hinge pin and narrow sections whose width is narrower than the hinge pin, arranged alternately along the vertical direction of the seat. The narrow sections are elastically deformable so that the hinge pin can pass through. This allows for a simple configuration; when the hinge pin is placed in the wide section, the hinge pin's sliding is locked and the position of the second pillow section is maintained. However, when a force of a predetermined value or more is applied to the second pillow section along the vertical direction of the seat, the hinge pin slides while elastically deforming the narrow sections, allowing the second pillow section to move.

Furthermore, when the hinge pin is positioned in the wide portion of the groove of the guide member, the second pillow section can be rotated around the axis of the hinge pin. Furthermore, in this invention, the guide member is not provided as a target for such rotation, so 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.

The headrest of the present invention described in claim 2 is the same as the headrest described in claim 1, but has a pair of left and right side portions that extend upward from a portion that continues outward in the seat width direction from the second pillow portion and includes a portion that is positioned outward in the seat width direction from the first pillow portion, and the guide members are provided in pairs on the left and right side portions 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.

With the above configuration, the guide members are provided in pairs on the left and right side portions of the first pillow portion, making it easy to ensure the length of each guide member in the guide direction in the groove-shaped portion. Furthermore, the hinge pins are attached to the upper portions of the pair of left and right side portions that are continuous with the second pillow portion, making it possible to lengthen the range over which the hinge pins can slide within the groove-shaped portion toward the lower side of the seat. This makes it possible to widen the range over which the second pillow portion can be moved toward the lower side of the seat from the first position.

The headrest of the present invention described in claim 3 is the same as the headrest described in claim 1 or claim 2, except that the guide member has through-holes formed on both sides of the narrow portion in the width direction on the outer side thereof, allowing the narrow portion to elastically deform outward in the width direction.

With the above configuration, when a force is applied to the second pillow portion in the up-down direction of the seat and the hinge pin causes the narrow portion to elastically deform outward in the width direction, the narrow portion elastically deforms toward the space in the hole. This makes it easier to design the narrow portion to elastically deform with an appropriate force.

The headrest of the present invention described in claim 4 is configured as described in claim 3, wherein 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 portion than a second groove edge portion that forms the edge of the wide width portion and is the portion between the adjacent hole portions in the guide direction of the groove portion.

With the above configuration, the first groove edge that forms the edge of the narrow width portion is smaller in dimension in the same direction as the width of the groove-shaped portion than the second groove edge that forms the edge of the wide width portion, making it easy to elastically deform the narrow width portion with an appropriate amount of force.

The vehicle seat of the present invention described in claim 5 includes the headrest described in 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 when the hinge pin is positioned in the uppermost wide portion of the groove-shaped portion, the second pillow portion is positioned in the first position, and 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, the second pillow portion is positioned so that it entirely overlaps the seat back in a front view of the seat.

With the above configuration, when the hinge pin is positioned in the uppermost wide portion of the groove, the second pillow portion is positioned in the first position. Furthermore, 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 of the groove, the entire second pillow portion is positioned so that it overlaps the seat back when viewed from the front of the seat. Therefore, even if a large load is input from the seated occupant's head to the second pillow portion during a collision, the head can be stably supported.

As explained above, the present invention has the excellent effect of being able to accommodate a wide range of variations in the height position of seated occupants' heads with a simple configuration.

1 is a perspective view showing a vehicle seat according to an embodiment of the present invention; FIG. 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 . 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. 1. FIG. 4 is a schematic side view illustrating a state in which the second pillow portion in FIG. 1 has been moved downward from the first position. FIG. 3 is a front view of the slide plate of FIG. 2 . FIG. 2 is a perspective view showing a state in which the second pillow portion of FIG. 1 is rotated. FIG. 2 is a perspective view showing a state in which the second pillow portion of FIG. 1 is slid downward.

A vehicle seat having a headrest according to one embodiment of the present invention will be described using 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 width direction of the seat (left-right direction of the seat).

Figure 1 shows a perspective view of a vehicle seat 10 according to this embodiment. The vehicle seat 10 includes a seat cushion 12 (only part 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.

Figure 2 shows a perspective view of part of the internal structure from the headrest 16 to the upper part of the seat back 14. In Figure 2, part of the outline of the front side of the headrest 16 and part of the outline of the upper part of the seat back 14 are indicated by two-dot chain lines. As shown in Figure 2, the seat back 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 Figure 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.

As shown in FIG. 1 , the headrest 16 includes a first pillow section 30 and a movable section 32 formed in a generally U-shape, including a second pillow section 34 located below the front surface of the first pillow section 30 when viewed from the front of the seat. Both the first pillow section 30 and the second pillow section 34 are designed to support the head of a seated occupant. The first pillow section 30 constitutes a part of the middle section 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 section 34 is configured to be movable between a first position 34X located adjacent to the lower front surface 30A of the first pillow section 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 section 32, which includes the second pillow section 34, has a pair of left and right side sections 36 that extend upward from a section connected to the outer side of the second pillow section 34 in the seat width direction and include a section located outward of the first pillow section 30 in the seat width direction. The pair of left and right side sections 36 bulge out towards the front of the seat.

The first pillow section 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 shows a perspective view of part of the internal structure of the headrest 16, viewed from a different direction than that shown in 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 generally 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 legs 42A extending downward, which are connected to the upper end 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.

As shown in Figures 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 legs 42A that form the upper end of the headrest stay 42. The front plate portion 44A extending left and right on this bracket 44 is positioned forward of the left and right legs 42A of the headrest stay 42 and holds padding (not shown).

A striker 78 is fixed to the front surface of the front plate portion 44A of the bracket 44 in the middle in the seat width direction. The striker 78 is formed by bending a wire and is generally U-shaped when viewed from the front of the seat and generally L-shaped when viewed from the side of the seat. Mounting portions 78A on both ends 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 surrounding area on the front end of the striker 78 will be described later.

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

A slide plate 50, which serves as a guide member and has a shape similar to that of 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 sides of the first pillow section 30 (see Figure 2). The slide plates 50 will be described in detail below. The slide plates 50 and guide plate 44B are pierced from the outer side in the seat width direction by a hinge pin 60. The hinge pin 60 is attached to the upper part of each of the pair of left and right side sections 36 (see Figure 2), and its axis is aligned with the seat width direction.

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

The front ends of the pair of left and right mounting brackets 64 are connected by a frame body 70. The frame body 70 forms the framework of the movable section 32 (see Figure 2) and is formed in a roughly U-shape when viewed from the front of the seat. It 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 downward from the front end side of the mounting brackets 64 outward in the seat width direction, then extend downward, with their lower ends further bent inward in the seat width direction so that they approach each other. The connecting member 74 is roughly U-shaped when viewed from the front of the seat, and both side wall portions 74A are joined to the ends of the pipe members 72.

A support shaft 75 is attached to one side of the pair of left and right side wall portions 74A of the connecting member 74. The support shaft 75 is positioned with its axis aligned with the seat width direction and supports a latch 76. As shown in FIG. 3, the latch 76 is formed in a roughly V-shape when viewed from the side of the seat, and an engagement recess (not shown) formed on the underside of one arm 76A is able to engage with the 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 (position where it engages with the striker 78) shown in FIG. 3 and an unlatched position (position where it does not engage with the striker 78; not shown) in which the protruding tip of one arm 76A faces upward, and is biased by a spring 77 toward the latched position shown in FIG. 3.

The tip of a release lever 80 is located on the seat front side of the other half 76B of the latch 76. The release lever 80 is located 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 base end portion on the seat rear side is attached to the bottom wall 74B so that it can rotate around a rotation axis 81 in the seat up-down direction. The base end portion of the release lever 80 on the seat front side is bent so that it faces the seat width direction and is connected to an unlock button 84 via a shaft-shaped member 82. The unlock button 84 is located on the lower side of the side of the movable part 32 (see Figure 2).

In this embodiment, when the unlock button 84 is pressed, the release lever 80 rotates, placing the latch 76 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 around the axis of the hinge pin 60 to the position 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, it can be returned to the state shown by the solid line in FIG. 1 and the state shown in FIG. 3.

Next, we will explain in detail the guide mechanism 48 shown in Figure 2, which includes the hinge pin 60, slide plate 50, and guide plate portion 44B.

As is clear from the above description, the hinge pin 60 is connected to the frame body 70 via the weld nut 62 and the mounting bracket 64, and is provided so as to be movable integrally with the second pillow section 34. The guide mechanism 48, which includes the hinge pin 60, slide plate 50, and guide plate section 44B, is a mechanism for guiding the second pillow section 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 in the guide plate section 44B shown in FIG. 2 is uniformly set slightly wider than the width of the hinge pin 60.

Figure 4 shows a schematic side view illustrating the state in which the second pillow section 34 has been moved downward from the first position 34X. As shown in Figure 4, the slide plate 50 is attached to the first pillow section 30 and is arranged with its longitudinal direction aligned with the seat's vertical direction. Although not shown, a slit (not shown) is formed in the trim cover 46 of the first pillow section 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.

Figure 5 shows a front view of the slide plate 50. As shown in Figure 5, the slide plate 50 has a groove 52 that guides the hinge pin 60 in the up-down direction of the seat. The groove 52 has wide portions 54 that have 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 arranged alternately 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. Of the multiple narrow portions 56, the uppermost narrow portion 56 (56F) extends in the guiding direction of the groove 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 52 in a front view.

In addition, holes 58 are formed through the slide plate 50 on both sides of the narrow portion 56 in the width direction, allowing the narrow portion 56 to elastically deform outward in the width direction. The uppermost hole 58 (58F) of the multiple holes 58 is formed in a generally isosceles trapezoidal shape with its base on the side opposite the narrow portion 56 in a front view and extends along the guide direction of the groove portion 52. The second and subsequent holes 58 (56E) are formed in a D-shape with an arc-shaped edge on the narrow portion 56 side in a front view. Furthermore, the first groove edge 56A, which forms the edge of the narrow portion 56 and is the portion between the narrow portion 56 and the hole 58, has a smaller dimension (i.e., a thinner thickness) in the width direction of the groove portion 52 than the second groove edge 54A, which forms the edge of the wide portion 54 and is the portion between adjacent hole portions 58 in the guide direction of the groove portion 52.

When the hinge pin 60 is positioned in the uppermost wide portion 54 (54F) of the groove 52, the second pillow portion 34 is positioned in the first position 34X as shown in FIG. 1. When the headrest stay 42 shown in FIG. 2 is inserted deepest into the seat back 14 and the hinge pin 60 is positioned in the second wide portion 54 (54S) from the top of the groove 52 shown in FIG. 5, the entire second pillow portion 34 shown in FIG. 6B is positioned so that it overlaps with the seat back 14 in a front view of the seat. In other words, the groove 52 shown in FIG. 5 can be used to position the movable portion 32 shown in FIG. 6B and other figures in the vertical 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.

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

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 front side of the seat with respect to the lower front surface 30A of the first pillow section 30, and a second position 34Y, which is located below the first position 34X. The 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 movably provided 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 up-down direction of the seat via a groove 52 shown in FIG. 5. Therefore, by increasing the length of the groove portion 52 in the guide direction, the range of movement of the second pillow portion 34 in the up-down direction of the seat, as shown in Figure 1, etc., can be increased.

As shown in FIG. 5, the groove 52 alternates between wide sections 54, which have a width corresponding to the width of the hinge pin 60, and narrow sections 56, which are narrower than the hinge pin 60, along the vertical direction of the seat. The narrow sections 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 section 54, the hinge pin 60 is locked from sliding, maintaining the position of the second pillow section 34 shown in FIG. 1, etc. This effectively prevents or prevents the second pillow section 34 from inadvertently returning to its original position. Meanwhile, when a force equal to or greater than a predetermined value is applied to the second pillow section 34 along the vertical direction of the seat, the hinge pin 60 shown in FIG. 5 slides while elastically deforming the narrow sections 56, thereby moving the second pillow section 34 (see FIG. 1, etc.).

Furthermore, when the hinge pin 60 is positioned in the wide portion 54 of the groove portion 52 of the slide plate 50, the second pillow portion 34 (see Figure 1, etc.) can be rotated around the axis of the hinge pin 60. Furthermore, in this embodiment, a guide member is not provided on the target of such rotation, so there are fewer restrictions on setting the length of the guide member (slide plate 50) in the guiding direction compared to a configuration in which a guide member is provided on the target of rotation.

In addition, in this embodiment, a pair of slide plates 50 shown in FIG. 4 are provided 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-shaped portion 52 (see FIG. 5). Furthermore, because the hinge pins 60 are attached to the upper portions of the pair of left and right side portions 36 that are continuous with the second pillow portion 34, the range over which the hinge pins 60 can slide downward in the groove-shaped portion 52 shown in FIG. 5 can be extended. This makes it possible to increase the range over which the second pillow portion 34 shown in FIG. 1 can be moved downward from the first position 34X.

In addition, in this embodiment, as shown in FIG. 5, 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. 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.

Furthermore, in this embodiment, the first groove edge 56A, which forms 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 forms 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. Therefore, it is easy to elastically deform the narrow width portion 56 with an appropriate force.

In addition, in this embodiment, when the hinge pin 60 is positioned in the uppermost wide portion 54 (54F) of the groove-shaped portion 52, the second pillow portion 34 is positioned in the first position 34X as shown in FIG. 1. Furthermore, when the hinge pin 60 is positioned in the second-highest wide portion 54 (54S) 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 by the two-dot chain line in FIG. 4 is positioned so as to overlap 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.

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

[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 modified example of the above embodiment, for example, a configuration can be adopted 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).

In addition, in the above embodiment, holes 58 are formed through the slide plate 50 serving as a guide member on both sides of the narrow portion 56 on the outer side in the width direction. While this configuration is preferred, it is also possible to use a configuration in which the narrow portion of the guide member is formed of, for example, rubber and no holes are provided on either side of the narrow portion on the outer side in the width direction.

As a variation of the above embodiment, a configuration in which the first groove edge portion (56A) is smaller than the second groove edge portion (54A) in the same direction as the width direction of the groove-shaped portion (52) is also possible.

As a modification of the above embodiment, a configuration is also possible in which, 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 portion (52), the majority of the second pillow portion (34) is positioned so as to overlap the seat back (14) in a front view of the seat.

The above embodiment and the various modifications described above can be implemented in appropriate combinations.

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 various modifications and variations are possible within the scope of the present invention.

REFERENCE SIGNS LIST 10 Vehicle seat 14 Seat back 16 Headrest 30 First pillow portion 30A Lower front portion 34 Second pillow portion 34X First position 34Y Second position 36 Side portion 42 Headrest stay 48 Guide mechanism 50 Slide plate (guide member)
52 Groove-shaped portion 54 Wide portion 54A Second groove edge portion 54F Top wide portion 54S Second wide portion from the top
56 Narrow width portion 56A First groove edge portion 58 Hole portion 60 Hinge pin

Claims (5)

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. 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. A headrest as described in claim 1 or claim 2, wherein the guide member has through-holes formed on both sides of the narrow portion in the width direction outside thereof, allowing the narrow portion to elastically deform outward in the width direction. A headrest as described in claim 3, wherein a first groove edge portion, which forms the edge of the narrow width portion and is the portion between the narrow width portion and the hole, 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 the edge of the wide width portion and is the portion between the adjacent hole-shaped portions in the guide direction of the groove-shaped portion. 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.