Headrest grommet and vehicle seat

Abstract

To provide a headrest grommet that facilitates removing work of a seatback from a frame.SOLUTION: A headrest grommet 30 comprises a cylindrical part 32 and a head part 38. The cylindrical part 32 is inserted from a seat upper side into a grommet insertion part provided in an upper portion of a frame of a seatback and is restricted from displacement toward the seat upper side relative to the grommet insertion part. A stay of the headrest inserted inside the cylindrical part 32. The head part 38 is attached to an upper end of the cylindrical part 32, and has an insertion hole 46 for the stay to be inserted. The head part 38 disposed being exposed to on an upper surface side of the seatback and is restricted from displacement toward a seat lower side relative to the grommet insertion part. In addition, it is detachable from the cylindrical part 32.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a vehicle seat, and more particularly to a headrest grommet into which a headrest stay is inserted.

Background Art

[0002] In the vehicle seat disclosed in Patent Document 1 below, a pair of left and right headrest supports (headrest grommets) into which headrest stays are inserted are attached to an upper frame that constitutes the upper part of the seat back frame. The upper frame has flat top and bottom plate portions facing each other in the vertical direction, and keyhole-shaped through-holes into which headrest grommets are inserted are formed in the top and bottom plate portions, respectively. The headrest grommets inserted into the respective through-holes are rotated in one direction around their axes. As a result, a part of the headrest grommet engages with the edge of each through-hole in the vertical direction, and removal of the headrest grommet from the upper frame is restricted.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above prior art, when removing the headrest grommet from the upper frame, it is necessary to rotate the headrest grommet in the other direction around its axis. At this time, if the engagement strength of the headrest grommet with the edge of each through-hole of the upper frame is high, the operation of rotating the headrest grommet becomes complicated.

[0005] In view of the above facts, an object of the present invention is to obtain a headrest grommet that can be easily removed from the frame of a seat back and a vehicle seat equipped with the headrest grommet.

Means for Solving the Problems

[0006] The headrest grommet of the first aspect is inserted from the upper side of the seat into a grommet insertion portion provided at the upper part of the frame of the seat back, and is restricted from being displaced upward with respect to the grommet insertion portion, and a cylindrical portion into which a stay of the headrest is inserted inside, and attached to the upper end portion of the cylindrical portion, an insertion hole into which the stay is inserted is formed, and it is disposed so as to be exposed on the upper surface side of the seat back, and is restricted from being displaced downward with respect to the grommet insertion portion, and a head that is detachable from the cylindrical portion.

[0007] In the headrest grommet of the first aspect, the cylindrical portion is inserted from the upper side of the seat into a grommet insertion portion provided at the upper part of the frame of the seat back. This cylindrical portion is restricted from being displaced upward with respect to the grommet insertion portion, and a stay of the headrest is inserted inside. At the upper end portion of the cylindrical portion, a head having an insertion hole into which the stay is inserted is attached. This head is disposed so as to be exposed on the upper surface side of the seat back, and is restricted from being displaced downward with respect to the grommet insertion portion. Thereby, the headrest grommet is restricted from being displaced in the vertical direction of the seat with respect to the grommet insertion portion. The above head is detachable from the cylindrical portion. When this head is removed from the cylindrical portion, the restriction on the downward displacement of the cylindrical portion is released, so that the cylindrical portion can be removed downward with respect to the grommet insertion portion. In this aspect, when removing the headrest grommet from the frame, it is not necessary to rotate the entire headrest grommet with respect to the frame, so that the removal work becomes easy.

[0008] In the headrest grommet according to the second aspect, in the first aspect, the head has a plurality of locking claws that are inserted into the cylindrical portion and elastically deformed, the cylindrical portion has a plurality of locking holes with which the plurality of locking claws elastically return and engage, and the engagement is released by rotating the head in one direction around the axis with respect to the cylindrical portion.

[0009] In the headrest grommet according to the second aspect, when the head is attached to the cylindrical portion, a plurality of locking claws of the head are inserted into the cylindrical portion. At this time, the plurality of locking claws are elastically deformed and elastically return to engage with a plurality of locking holes of the cylindrical portion. When the head is removed from the cylindrical portion, the engagement of the plurality of locking claws with the plurality of locking holes is released by rotating the head in one direction around the axis with respect to the cylindrical portion. Thus, since the head is configured to be rotated and removed with respect to the cylindrical portion, it is possible to prevent the head from being inadvertently removed from the cylindrical portion due to the load acting on the headrest grommet during normal times.

[0010] In the headrest grommet according to the third aspect, in the first aspect, one of the head and the cylindrical portion has a male screw portion coaxial with the cylindrical portion, the other of the head and the cylindrical portion has a female screw portion coaxial with the cylindrical portion, and the head is attached to the cylindrical portion by screwing the male screw portion into the female screw portion.

[0011] In the headrest grommet according to the third aspect, when the head is attached to the cylindrical portion, the male screw portion of one of the head and the cylindrical portion is screwed into the female screw portion of the other of the head and the cylindrical portion. When the head is removed from the cylindrical portion, the screwing engagement between the male screw portion and the female screw portion is released by rotating the head with respect to the cylindrical portion. Thus, since the head is configured to be rotated and removed with respect to the cylindrical portion, it is possible to prevent the head from being inadvertently removed from the cylindrical portion due to the load acting on the headrest grommet during normal times.

[0012] The vehicle seat according to the fourth aspect includes a seat back that supports the back of an occupant, a headrest that supports the head of the occupant, and a grommet insertion portion provided at the upper part of the frame of the seat back, into which the tubular portion is inserted, and a headrest grommet according to any one of the first to third aspects, wherein a stay of the headrest is inserted into the inside of the tubular portion and the insertion hole of the head of the headrest grommet.

[0013] In the vehicle seat according to the fourth aspect, the back of the occupant is supported by the seat back, and the head of the occupant is supported by the headrest. The tubular portion of the headrest grommet is inserted into the grommet insertion portion provided at the upper part of the frame of the seat back, and the stay of the headrest is inserted into the inside of the tubular portion and the insertion hole of the head of the headrest grommet. Since the above headrest grommet is according to any one of the first to third aspects, the above-described effects can be obtained.

Advantages of the Invention

[0014] As described above, according to the present invention, the removal work of the headrest grommet from the frame of the seat back becomes easy.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Mode for Carrying Out the Invention

[0016] <First Embodiment> Hereinafter, the vehicle seat 10 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 13. In each figure, some reference numerals may be omitted for ease of viewing the drawings. Also, the arrows FR, LH, RH, and UP appropriately shown in each figure indicate the front, left, right, and upper directions of the vehicle seat 10, respectively. Hereinafter, when simply explaining using the front-back, left-right, and up-down directions, it shall indicate the direction with respect to the vehicle seat 10.

[0017] As shown in FIG. 1, a vehicle seat 10 according to this embodiment includes a seat back 12 that supports the back of an occupant, a headrest 26 that supports the head of the occupant, and a pair of left and right headrest grommets 30 (the right headrest grommet 30 is not shown) attached to the upper part of the frame 14 of the seat back 12. The seat back 12 stands upright from the rear end of a seat cushion (not shown) on which the occupant sits, and the headrest 26 is connected to the frame 14 of the seat back 12 via a pair of headrest grommets 30. Note that the pair of headrest grommets 30 may be regarded as components of the seat back 12.

[0018] The seat back 12 has a seat back pad (not shown) covered on the frame 14 and a seat back skin 24 covering the surface of the seat back pad. The seat back pad is made of a foam such as urethane foam, for example, and the seat back skin 24 is formed in a bag shape by sewing a plurality of skin pieces made of a cloth material, leather, synthetic leather, or the like.

[0019] The frame 14 includes a pair of left and right side frames 16 extending in the vertical direction and an upper frame 18 connecting the upper end portions of the pair of side frames 16 in the horizontal direction. The pair of side frames 16 are manufactured by press-forming a metal plate, for example, and have a substantially U-shaped cross-section with the central side in the horizontal direction open when viewed from the vertical direction. The upper frame 18 is manufactured by bending a metal pipe, for example, and has a substantially inverted U-shaped cross-section when viewed from the front-rear direction.

[0020] The headrest 26 has a stay 28 that constitutes its skeleton, a headrest pad (not shown) that is a cushioning material supported by the stay 28, and a headrest skin 29 covering the surface of the headrest pad. The stay 28 is formed by bending a metal pipe material, for example, and has a substantially inverted U-shaped cross-section when viewed from the front-rear direction.

[0021] This stay 28 is composed of a pair of left and right legs 28A extending in the vertical direction and a connecting part 28B connecting the upper ends of the pair of legs 28A in the left - right direction. The headrest pad is made of a foam such as urethane foam, for example. The upper part of the stay 28 is embedded in the headrest pad. The headrest skin 29 is formed in a bag shape by sewing a plurality of skin pieces made of a cloth material, leather, synthetic leather, or the like.

[0022] Corresponding to the above - mentioned headrest 26, a pair of left and right headrest bushes 20 (the right - hand headrest bush 20 is not shown) are provided at the intermediate part in the left - right direction of the upper frame 18. Each headrest bush 20 corresponds to the " grommet insertion part " in the present invention. The left and right headrest bushes 20 are in a cylindrical shape (here, a circular - cylindrical shape) with the vertical direction of the seat back 12 as the axial direction.

[0023] The left and right headrest bushes 20 are arranged side by side with a space in the left - right direction on the front side of the upper frame 18. As shown in FIG. 2, the upper frame 18 has a portion facing the left and right headrest bushes 20 crushed to a substantially D - shaped cross - section, and the headrest bushes 20 are joined to this portion by means such as welding.

[0024] A pair of retaining holes 22 are formed at the lower part of each headrest bush 20. The pair of retaining holes 22 are arranged opposite to each other in the radial direction of the headrest bush 20 and are rectangular when viewed from the radial direction of the headrest bush 20. A headrest grommet 30 is inserted into each headrest bush 20.

[0025] As shown in FIGS. 1 to 7, the headrest grommet 30 is composed of a cylindrical portion 32 formed in a cylindrical shape (here, a circular cylindrical shape) and a head portion 38 detachably attached to one axial end portion (upper end portion) of the cylindrical portion 32. The cylindrical portion 32 and the head portion 38 are manufactured, for example, by injection molding of resin. A pair of retaining claws 34 protruding outward in the radial direction of the cylindrical portion 32 are formed in the middle portion in the axial direction of the cylindrical portion 32.

[0026] The pair of retaining claws 34 are arranged to face each other in the radial direction of the cylindrical portion 32. The pair of retaining claws 34 are formed such that the amount of protrusion outward in the radial direction of the cylindrical portion 32 increases from one axial end side to the other end side of the cylindrical portion 32, and are elastically deformable inward in the radial direction of the cylindrical portion 32.

[0027] A pair of locking holes 36 are formed at one axial end portion of the cylindrical portion 32. The pair of locking holes 36 are arranged to face each other in the radial direction of the cylindrical portion 32 and have a rectangular shape when viewed from the radial direction of the cylindrical portion 32. The pair of locking holes 36 correspond to the head portion 38 attached to one axial end portion of the cylindrical portion 32.

[0028] The head portion 38 is formed in a substantially disc shape and has a head body 40 arranged coaxially with the cylindrical portion 32, a rectangular portion 42 integrally formed on the cylindrical portion 32 side of the head body 40 and having a rectangular shape when viewed from the axial direction of the cylindrical portion 32, and a pair of locking claws 44 integrally protruding from the rectangular portion 42 to the side opposite to the head body 40. Insertion holes 46 penetrating through the head body 40 and the rectangular portion 42 are formed in the head body 40 and the rectangular portion 42. The insertion holes 46 have a circular shape when viewed from the axial direction of the cylindrical portion 32 and are arranged coaxially with the cylindrical portion 32. The inside of the cylindrical portion 32 and the insertion holes 46 communicate with each other.

[0029] The pair of locking claws 44 are provided at the hole edge of the insertion hole 46 and are arranged on opposite sides of each other via the insertion hole 46. The pair of locking claws 44 are inserted into the cylindrical portion 32 and are elastically deformable toward the inner side in the radial direction of the cylindrical portion 32. At the tip of the pair of locking claws 44, claw portions 44A protruding radially outward of the cylindrical portion 32 are provided. As shown in FIGS. 7 and 8, the claw portions 44A of the pair of locking claws 44 are engaged (fitted) with the pair of locking holes 36 described above. Thereby, the head 38 is locked (fixed) to the cylindrical portion 32.

[0030] The cylindrical portion 32 of the headrest grommet 30 is inserted into the headrest bush 20 from above. A pair of retaining claws 34 provided at the intermediate portion in the axial direction of the cylindrical portion 32 are fitted into a pair of retaining holes 22 formed in the lower portion of the headrest bush 20. The cylindrical portion 32 is restricted from displacing upward with respect to the headrest bush 20 by the upper surface of the pair of retaining claws 34 being caught by the upper edge of the pair of retaining claws 34.

[0031] The head 38 of the headrest grommet 30 is arranged with the head body 40 exposed on the upper surface side of the seat back 12, and the lower surface of the rectangular portion 42 is in contact with the upper end surface of the headrest bush 20. Thereby, the head 38 is restricted from displacing downward with respect to the headrest bush 20. The rectangular portion 42 is arranged in a through hole (not shown) formed in the seat back skin 24 and the pad of the seat back 12.

[0032] The left and right leg portions 28A of the stay 28 of the headrest 26 are inserted into the insertion holes 46 and the inside of the cylindrical portion 32 of the heads 38 of the left and right headrest grommets 30 from above. Thereby, the stay 28, that is, the headrest 26 is supported by the left and right headrest grommets 30 on the frame 14 of the seat back 12. As shown in FIG. 9, the elastic deformation of the pair of locking claws 44 provided on the head 38 toward the inner side in the radial direction of the cylindrical portion 32 is restricted by the leg portions 28A. Thereby, the fitting state of the claw portions 44A of the pair of locking claws 44 with respect to the pair of locking holes 36 is configured to be maintained.

[0033] A locking mechanism (not shown) is provided in the head 38 of one of the headrest grommets 30. This locking mechanism restricts the relative vertical movement of the leg portion 28A with respect to one of the headrest grommets 30. This locking mechanism has an unlocking button, and when the unlocking button is pressed, the stay 28, that is, the headrest 26, can move relative to each headrest grommet 30 in the vertical direction, and the vertical position of the headrest 26 with respect to the seat back 12 can be adjusted.

[0034] As shown in FIGS. 8 to 12, each locking hole 36 has an inclined surface at one edge portion around the axis of the cylindrical portion 32. The inclined surface 36A is inclined or curved so as to go toward the inner side in the radial direction of the cylindrical portion 32 as it goes toward one side around the axis of the cylindrical portion 32. A protrusion 37 protruding inward in the radial direction of the cylindrical portion 32 is formed at the end portion on one side around the axis in the inclined surface 36A.

[0035] When the head 38 is removed from the cylindrical portion 32, first, the leg portion 28A of the stay 28 is pulled out from the head 38 and the cylindrical portion 32. Next, the head 38 is rotated to one side around the axis with respect to the cylindrical portion 32 (see the arrow R in FIG. 10), and the claw portions 44A of the pair of locking claws 44 slide on the inclined surfaces 36A of the pair of locking holes 36. As a result, as shown in FIG. 11, the pair of locking claws 44 is elastically deformed inward in the radial direction of the cylindrical portion 32. When the pair of locking claws 44 gets over the protrusion 37, the claw portions 44A of the pair of locking claws 44 come out of the pair of locking holes 36, and the pair of locking claws 44 is disposed inside the inner peripheral surface of the cylindrical portion 32. In this state, when the head 38 is pulled upward, the head 38 is removed from the cylindrical portion 32 (see FIGS. 12 and 13). Thereby, the seat back skin 24 and the pad of the seat back 12 can be removed from the frame 14.

[0036] Further, when the head portion 38 is removed from the cylindrical portion 32, the cylindrical portion 32 can be displaced downward with respect to the headrest bush 20. The cylindrical portion 32 is, for example, pressed downward using a jig or the like, and then drops downward from the headrest bush 20 and is removed. At this time, a pair of retaining claws 34 provided on the cylindrical portion 32 are in sliding contact with the headrest bush 20 and elastically deformed inward in the radial direction of the cylindrical portion 32.

[0037] When manufacturing the vehicle seat 10, the head portion 38 of the headrest bush 20 is attached to the cylindrical portion 32 in advance. At the time of this attachment, a pair of locking claws 44 of the head portion 38 are inserted into the cylindrical portion 32 and elastically deformed, and then elastically return to engage with a pair of locking holes 36. When the headrest grommet 30 is assembled to the seat back 12, after a pad is attached to the frame 14 and the seat back skin 24 is put on, the cylindrical portion 32 of the headrest grommet 30 is inserted into the headrest bush 20 through the through holes of the seat back skin 24 and the pad. At this time, a pair of retaining claws 34 of the cylindrical portion 32 are in sliding contact with the headrest bush 20 and elastically deformed, and then elastically return to fit into a pair of retaining holes 22. Thereby, the assembly of the headrest grommet 30 to the seat back 12 is completed.

[0038] Next, the operation and effects of the present embodiment will be described. In the vehicle seat 10 configured as described above, the back of the occupant sitting on the seat cushion is supported by the seat back 12, and the head of the occupant is supported by the headrest 26. The cylindrical portion 32 of the headrest grommet 30 is inserted into the headrest bush 20 provided at the upper part of the frame 14 of the seat back 12, and the leg portion 28A of the stay 28 of the headrest 26 is inserted into the inside of the cylindrical portion 32 and the insertion hole 46 of the head portion 38 of the headrest grommet 30.

[0039] The cylindrical portion 32 is restricted from displacing upward with respect to the headrest bush 20. The head portion 38 is disposed so as to be exposed on the upper surface side of the seat back 12 and is restricted from displacing downward with respect to the headrest bush 20. As a result, the headrest grommet 30 is restricted from displacing in the vertical direction with respect to the headrest bush 20. The above-described head portion 38 is detachable from the cylindrical portion 32. When the head portion 38 is removed from the cylindrical portion 32, the restriction on the downward displacement of the cylindrical portion 32 is released, so that the cylindrical portion 32 can be removed downward with respect to the headrest bush 20. In this embodiment, as in the prior art described in the background art section, when removing the headrest grommet from the frame, it is not necessary to rotate the entire headrest grommet with respect to the frame, so the removal operation becomes easy. As a result, the efficiency of the disassembling operation of the seat back 12 is improved.

[0040] Also, in the above prior art, since the headrest grommet is removed from the frame with the seat back frame covered with the seat back pad and the seat back skin, the work is performed in a state where the engagement portion of the headrest grommet with respect to the frame is not visible. On the other hand, in this embodiment, by pulling out the stay 28 of the headrest 26 from the headrest bush 30, the state of removing the head portion 26 from the cylindrical portion 32 can be visually recognized from the insertion hole 46 of the head portion 26. Moreover, since the operation of removing the cylindrical portion 32 from the frame 14 is performed after removing the seat back skin 24 and the seat back pad from the frame 14, the removal operation has excellent visibility. As a result, the efficiency of the disassembling operation of the seat back 12 is further improved.

[0041] Also, in this embodiment, when the headrest 26 is in use, since the stay 28 is fitted in the headrest bush 30 (the state shown in FIG. 9), the head portion 26 cannot rotate with respect to the cylindrical portion 32. Therefore, it is possible to prevent the occupant from accidentally removing the head portion 32.

[0042] Also, in this embodiment, when the head 38 is attached to the cylindrical portion 32, a pair of locking claws 44 provided on the head 38 are inserted into the cylindrical portion 32. At this time, the plurality of locking claws 44 are elastically deformed and then elastically restored, and engage with a pair of locking holes 36 provided in the cylindrical portion 32. When the head 38 is removed from the cylindrical portion 32, the head 38 is rotated in one direction around the axis with respect to the cylindrical portion 32, so that the pair of locking claws 44 slide on the inclined surfaces 36A of the pair of locking holes 36, and the engagement of the pair of locking claws 44 with the pair of locking holes 36 is released. Since the head 38 is configured to be rotated and removed with respect to the cylindrical portion 32 in this way, it is possible to prevent the head 38 from being inadvertently removed from the cylindrical portion 32 by the load acting on the headrest grommet 30 during normal times, that is, for example, the vertical load acting on the headrest grommet 30 when adjusting the vertical position of the headrest 26.

[0043] Further, in this embodiment, a protrusion 37 that protrudes inward in the radial direction of the cylindrical portion 32 is formed at an end portion on one side around the axis on the inclined surface 36A of the pair of locking holes 36. Therefore, when the head 38 is rotated in one direction around the axis with respect to the cylindrical portion 32 in order to remove the head 38, the pair of locking claws 44 need to overcome the respective protrusions 37, so that it is possible to prevent the occupant from easily removing the head 38.

[0044] <Second Embodiment> Next, a second embodiment of the present invention will be described. Note that, for the components and operations that are basically the same as those in the first embodiment, the same reference numerals as those in the first embodiment are given, and the description thereof is omitted.

[0045] FIG. 14 shows a front view of a state where the head 38 is removed from the cylindrical portion 32 in a headrest grommet 50 according to the second embodiment of the present invention. In this embodiment, the head 38 has a male screw portion 52 coaxial with the cylindrical portion 32 instead of the pair of locking claws 44. The cylindrical portion 32 has a female screw portion 54 coaxial with the cylindrical portion 32 instead of the pair of locking holes 36. In this embodiment, the configuration other than the above is the same as that in the first embodiment.

[0046] When the head 38 is attached to the cylindrical portion 32, the male screw portion 52 of the head 38 is screwed into the female screw portion 54 of the cylindrical portion 32. When the head 38 is removed from the cylindrical portion 32, the male screw portion 52 and the female screw portion 54 are disengaged by rotating the head 38 relative to the cylindrical portion 32. Also in this embodiment, the operation of removing the headrest grommet 50 from the frame 14 of the seat back 12 is facilitated. Further, since the head 38 is configured to be rotated and removed relative to the cylindrical portion 32, it is possible to prevent the head 38 from being inadvertently removed from the cylindrical portion 32 due to the load acting on the headrest grommet 30 during normal times.

[0047] In the above-described first embodiment, the pair of locking claws 44 are provided on the head 38 and the pair of locking holes 36 are provided on the cylindrical portion 32. However, the present invention is not limited to this, and a configuration in which three or more locking claws are provided on the head and three or more locking holes are provided on the cylindrical portion may be employed.

[0048] Also, in the above-described second embodiment, the male screw portion 52 is provided on the head 38 and the female screw portion 54 is provided on the cylindrical portion 32. However, the present invention is not limited to this, and a configuration in which a male screw portion is provided on the cylindrical portion and a female screw portion is provided on the head may be employed.

[0049] Also, in each of the above embodiments, the headrest bush 20 fixed to the upper frame 18 of the frame 14 of the seat back 12 is configured as the grommet insertion portion. However, the present invention is not limited to this. For example, as in the prior art described in the background art section, when the upper frame has a flat top plate portion and a bottom plate portion, through holes formed in the top plate portion and the bottom plate portion for inserting the headrest grommet serve as the grommet insertion portion.

[0050] In addition, the present invention can be implemented with various modifications without departing from the gist thereof. Needless to say, the scope of rights of the present invention is not limited to the above-described embodiments.

Explanation of Reference Numerals

[0051] 10 Vehicle seat 12 seat back 14 frame 20 headrest bush (grommet insertion part) 26 headrest 28 stay 30 headrest grommet 32 cylindrical part 36 locking hole 38 head 44 locking claw 46 insertion hole 50 headrest grommet 52 male screw part 54 female screw part

Claims

1. It is inserted from above the seat into a grommet insertion portion provided at the upper part of the frame of the seat back, is restricted from displacing upward of the seat with respect to the grommet insertion portion, and has a cylindrical portion into which a stay of the headrest is inserted inside; a head attached to the upper end portion of the cylindrical portion, having an insertion hole into which the stay is inserted, disposed so as to be exposed on the upper surface side of the seat back, restricted from displacing downward of the seat with respect to the grommet insertion portion, and removable with respect to the cylindrical portion; A headrest grommet comprising:

2. The head has a plurality of locking claws that are inserted into the cylindrical portion and elastically deformed; The cylindrical portion has a plurality of locking holes into which the plurality of locking claws elastically return and engage; The headrest grommet according to claim 1, wherein the engagement is released by rotating the head in one direction around the axis with respect to the cylindrical portion.

3. One of the head and the cylindrical portion has a male screw portion coaxial with the cylindrical portion; The other of the head and the cylindrical portion has a female screw portion coaxial with the cylindrical portion; The headrest grommet according to claim 1, wherein the head is attached to the cylindrical portion by screwing the male screw portion into the female screw portion.

4. A seat back that supports the back of an occupant; A headrest that supports the head of the occupant; The headrest grommet according to any one of claims 1 to 3, wherein the cylindrical portion is inserted into a grommet insertion portion provided at the upper part of the frame of the seat back, and the stay of the headrest is inserted into the inside of the cylindrical portion and the insertion hole of the head; A vehicle seat comprising:

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