JP4893247B2 - Headrest - Google Patents

Description

  The present invention relates to a headrest. More specifically, the present invention relates to a headrest that is provided at an upper position of a seat back of a vehicle seat and supports a passenger's rear head.

In general, as a headrest of a vehicle seat, one having the following configuration is known. That is, a skin cover is put on a cushion pad formed by foaming urethane resin, and a rod-like stay serving as a support is inserted and fixed therein.
Here, the following Patent Document 1 discloses an example of the headrest assembly structure described above. As in this disclosure, in general, the stay is formed in a single gate-like shape in which two rod-like support members are connected to each other at the upper end portion. Therefore, the stay has a structure that cannot be simply assembled by simply inserting two rod-like support members into the cushion pad. In view of this, this disclosure employs a method in which the above-described portal-shaped stay is inserted and integrally formed with the cushion pad during foam molding. Thereby, the gate-shaped stay can be easily assembled to the cushion pad. The skin cover is separately covered from the upper side of the integrally formed cushion pad.
JP 2006-218115 A

  However, in the conventional technology disclosed above, a problem occurs when a mechanism such as a side support that can change the design shape is incorporated in the headrest. In other words, such a mechanism for changing the design shape is designed to change the design shape in such a manner that the skin cover is deformed by being assembled to the cushion pad and deformed. Therefore, in accordance with the movement of changing the design shape of the headrest, a displacement of the deformation amount occurs between the skin cover and the cushion pad, and the wrinkle is likely to move toward the skin cover.

  The present invention was devised as a solution to the above-described problems, and the problem to be solved by the present invention is to easily construct a structure such as a mechanism for changing the design shape of the headrest relative to the cushion pad. It is possible to assemble and make it difficult for wrinkles to come to the skin cover even if the design shape of the headrest is changed.

In order to solve the above problems, the headrest of the present invention takes the following means.
1st invention is the headrest which is provided in the upper part position of the seat back of a vehicle seat, and supports a passenger | crew's back head. The headrest includes a synthetic resin cushion pad, an epidermis cover, a skeleton, and a deformation allowing mechanism. The cushion pad is formed by foam molding and forms a basic outer shape for receiving the back of the occupant. The skin cover is disposed as a skin of the headrest by covering the cushion pad. The skeleton body is incorporated in the cushion pad, and the basic outer shape of the cushion pad can be changed by changing the shape of the skeleton body. The deformation permissible mechanism is provided in the skeleton body so that the incorporated shape of the skeleton body can be changed. The skeleton body provided with the deformation allowing mechanism is integrally assembled with the cushion pad by integral molding with the insert with the cushion pad. The skin cover is configured to be deformed integrally with the cushion pad when its covering surface is integrally bonded to the cushion pad. The skeleton body provided with the deformation allowing mechanism is configured as a side support mechanism capable of changing the basic outer shape of the cushion pad to a shape capable of supporting the occupant's temporal region. The skeleton includes a base integrally assembled on the upper part of a stay that serves as a support for the headrest, and side support portions that are hinged to both ends of the base in the lateral width direction by hinge mechanisms as deformation-allowing mechanisms. Have. Both side support parts are bent and deformed in a manner that the both sides in the lateral direction of the cushion pad are moved inward toward the front of the headrest in accordance with the movement of rotating the hinges, so that both sides of the cushion pad are The temporal region can be held in a shape that can be supported. The base of the skeletal body is disposed so as to be exposed on the rear surface side of the cushion pad, and the skin cover is formed in a rear surface opening shape in which a portion that hangs on the rear surface side of the cushion pad is opened. The peripheral edge portion of the opening portion that forms the rear surface opening shape is configured to be non-adhered to the cushion pad as an engagement portion to be engaged with the base exposed on the rear surface side of the cushion pad. A gap formed between the rear side portion of the cushion pad assembled to each side support portion and the base when the side support portions are hinge-rotated has a non-adhesive configuration with respect to the cushion pad. The peripheral part of the outer skin cover is configured to be covered with a tensile shape that is pulled out from the hooking part with the base.
According to the first aspect of the invention, the skeleton body having the deformation allowing mechanism is integrally assembled with the skeleton body by integral molding with the insert with the cushion pad. This skeletal body changes the design shape of the headrest by following and deforming the epidermis cover by a movement that changes the basic outer shape of the cushion pad. As for this skin cover, the coating surface which coat | covers a cushion pad is adhere | attached integrally with the cushion pad. Therefore, the skin cover is integrally deformed without peeling from the cushion pad. In addition, each side support portion is bent and deformed by moving the hinge pad relative to the base so that both side portions of the cushion pad are moved inward toward the front of the headrest. Thereby, each side support part hold | maintains the both-sides part of a cushion pad as a shape state which can support a passenger | crew's temporal region. Further, the peripheral portion of the opening portion of the skin cover is configured as an engaging portion to be attached to the base, and is not bonded to the rear surface portion of the cushion pad assembled to the side support portion. It has become. The peripheral portion of the skin cover is pulled out from the engagement portion with the base by the movement of rotating the side support portions by hinges, and a gap formed between the rear surface side portion of the cushion pad and the base is formed. Cover. In addition, it is preferable that the peripheral part of the skin cover has a stretchable structure.

Next, according to a second aspect of the present invention, in the first aspect described above, the skin cover is integrally bonded to the cushion pad by integral molding in a laminated form with the cushion pad.
According to the second aspect of the invention, the skin cover is integrally assembled with the cushion cover by the laminated integral molding with the cushion pad. As a result, the skin cover is put on the cushion pad from the outside and is integrally bonded thereto.

Next, according to a third aspect, in the second aspect described above, the headrest is formed such that the left and right shapes in the width direction are different from each other.
According to the third aspect of the invention, the work of covering the skin cover with respect to the headrest formed in the left and right different shapes in the lateral width direction takes time. However, even with such an irregularly shaped headrest, such an operation is simplified by adopting a structure in which the skin cover is integrally formed with the cushion pad in a laminated form.

Next, according to a fourth invention, in any one of the first to third inventions described above, the skin cover is partially folded inward of the headrest shape at the front side portion of the skin cover and then folded. A stitched portion is formed by stitching the portions together. The stitched portions are respectively formed at two positions in the width direction on the front side of the skin cover so as to follow the crease shape extending in the vertical direction entering the front side of the cushion pad when each side support portion rotates by hinges. ing.
According to the fourth aspect of the present invention, a fold shape extending in the vertical direction is formed at two positions in the lateral width direction on the front side of the cushion pad by rotating the side support portions by hinges. As a result, a crease is also formed on the front side of the skin cover, following the crease formed on the cushion pad. At this time, the skin cover is given directionality in the deformation direction by a stitched portion formed along the crease shape entering the front side of the cushion pad. Specifically, the epidermis cover is easily deformed so as to promote deformation in the direction in which the sutured portion is folded. Thereby, an outer skin cover deform | transforms with a sufficient crease | fold along the crease shape formed in a cushion pad.

The present invention can obtain the following effects by taking the above-described means.
First, according to 1st invention, the frame | skeleton body provided with the deformation | transformation allowance mechanism which can change the design shape of a headrest can be easily assembled | attached by integral molding by insert with a cushion pad. Then, by covering the skin cover in a state of being integrally bonded to the cushion pad, it is possible to make it difficult for wrinkles to come to the skin cover even if the design shape of the headrest is changed. In addition, the peripheral part of the skin cover is configured to be attached to the base as a non-adhesive structure with respect to the cushion pad, so that the skin cover can be easily deformed following the movement of folding the cushion pad. A wide gap between the base and the base can be covered without applying an abnormal load. Further, even when a side support mechanism having a long width is provided inside the headrest, it can be easily assembled to the cushion pad. And even if it changes the headrest into a shape that can be side-supported, it is possible to make it difficult for wrinkles to lean on the skin cover.
Furthermore, according to the second invention, since the skin cover is integrally formed with the cushion pad in a laminated manner, the work of covering the skin cover on the cushion pad can be omitted, and the assembly can be performed easily.
Furthermore, according to the third invention, the skin cover can be easily assembled to the cushion pad even in the headrest formed in the left and right different shapes.
Furthermore, according to the fourth invention, by forming the stitched portion on the skin cover along the fold formed on the cushion pad, the skin cover can be deformed well along the fold shape formed on the cushion pad. Can do.

  Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings.

First, the headrest 3 of Example 1 will be described with reference to FIGS.
As shown in FIG. 2, the headrest 3 of the present embodiment is provided at an upper position of the seat back 2 of the vehicle seat 1 so as to support the head of an occupant seated on the seat 1 from the rear side. It has become.
Here, the seat back 2 is provided with a seat belt device 2S which is a safety device for fixing the occupant's body to the seat 1. Specifically, the seat belt device 2S is provided in a form in which a pull-out portion Sa serving as a pull-out port of the belt Sb protrudes upward at the shoulder opening position of the seat back 2. Therefore, the headrest 3 is formed in a shape in which the lower portions on both ends in the lateral width direction are punched out in order to avoid interference with the protruding portion Sa of the protruding shape.

The headrest 3 is normally held in a shape state in which the receiving surface on the front surface side is flush with the occupant's rear head so that the headrest 3 can be received. However, as shown in FIG. 3, the headrest 3 is maintained in its bent shape by bending and deforming both side portions in the width direction toward the front of the headrest 3 inward. It is like that. Thereby, the headrest 3 will be in the shape state which can support a passenger | crew's temporal region (side support) by the both-sides site | part of the width direction made into the bending deformation.
Here, a specific configuration of the headrest 3 is shown in an exploded perspective view in FIG. As shown in the figure, the headrest 3 includes an epidermis cover 10, a cushion pad 20, a skeleton 30, and a rear cover 40.

Specifically, the skin cover 10 is formed in a planar shape by a soft material having elasticity such as vinyl chloride. The skin cover 10 is disposed as the skin of the headrest 3 by covering the cushion pad 20 from the outside.
The skin cover 10 is formed with an opening portion 10C that opens the rear portion and the lower portion thereof, and members such as the skeleton 30 and the stay 50 can be taken in and out of the opening portion 10C. A plurality of belt-like hooking members 11 are disposed at the peripheral portion 10B of the opening 10C. A plurality of these hooking members 11 are arranged along the peripheral portion 10B of the opening 10C and are sewn integrally to the skin cover 10. Each of these hooking members 11 is formed with a plurality of (for example, three) hooking holes 11N for hooking on hooks Bf formed on the skeleton body 30.

Next, the cushion pad 20 will be described. That is, the cushion pad 20 is formed by foaming of a soft urethane resin (synthetic resin), and is formed in the shape of the basic outer shape of the headrest 3 for receiving the back of the occupant.
The cushion pad 20 is formed integrally with the skin cover 10 and the skeleton 30. Specifically, the cushion pad 20 is integrally foam-molded in a laminated form so as to be filled in the skin cover 10 set in advance in the cavity space of the mold during the foam molding. . More specifically, the skin cover 10 is set in the cavity space of the molding die in a state of being assembled to the skeleton body 30 in advance, and the foam material of the cushion pad 20 is foamed in the space surrounded by the skeleton body 30. Let it be molded. Thereby, the cushion pad 20 is integrally foam-molded with the skeleton 30 inserted in the cavity space. Here, in FIG. 5, a state in which the cushion pad 20 is foam-filled in the space surrounded by the skin cover 10 and the skeleton 30 is well represented. As shown in the figure, the skin cover 10 is integrally formed with the cushion pad 20 so that the covering surface covering the skin cover 10 is in contact with the cushion pad 20 in an integral manner. ing.

Next, returning to FIG. 1, the skeleton 30 will be described. That is, the skeleton 30 includes a frame-shaped base 31 having a plate surface on the front surface side, side support portions 32 and 32 disposed at both ends in the width direction of the base 31, and the side support portions 32, And hinge mechanisms 33 and 33 for connecting the hinge 32 to the base 31.
Specifically, the base 31 has a frame-like frame portion 31B formed so as to protrude rearward along the peripheral edge of the front plate portion 31A forming the front plate surface. The lower frame portion of the frame portion 31B is formed with insertion holes Ba and Ba through which a stay 50 having two legs can be inserted. Furthermore, a plurality of hooks Bf are formed to project from the inner peripheral surface of the frame portion 31B. For example, three hooks Bf are formed on each of the upper, lower, left, and right frame portions of the frame portion 31B, and each of the hooks Bf is formed so that its tip faces the front of the skeleton body 30. A band-shaped hooking member 11 sewn on the skin cover 10 is hooked on these hooks Bf. Specifically, first, the skin cover 10 is covered so that the base 31 is inserted into the opening 10 </ b> C of the skin cover 10. Then, the hooking members 11 sewn on the peripheral portion 10B of the opening 10C are folded inward to position them on the inner peripheral surface side of the frame portion 31B of the base 31. Then, the hooking holes 11N formed in the respective hooking members 11 are inserted from the front end sides of the respective hooks Bf and are respectively hooked. Thereby, the skin cover 10 is assembled to the skeleton 30. Specifically, the skin cover 10 is in a state in which the opening 10 </ b> C is closed by being assembled with the skeleton body 30, and the internal space is closed. Accordingly, when the cushion pad 20 is foam-molded, the cushion pad 20 may be foam-molded so that the foam material does not leak in the closed space formed between the skin cover 10 and the skeleton 30. it can.

Next, the side support portions 32 and 32 are formed in a plate shape and are hingedly connected to the outer peripheral surfaces of the left and right frame portions of the base 31 by hinge mechanisms 33 and 33, respectively. As shown in FIG. 5, these side support portions 32, 32 are integrally bonded to the cushion pad 20 as being included in the cushion pad 20 by integral molding with the cushion pad 20. Therefore, as shown in FIG. 7, the side support portions 32, 32 are bent in such a manner that both side portions in the lateral width direction of the cushion pad 20 are moved inward toward the front of the headrest 3 by rotating the hinges thereof. Can be deformed. The skin cover 10 that is surface-bonded integrally with the cushion pad 20 can be deformed following the movement of bending and deforming the cushion pad 20. Here, the hinge mechanisms 33 and 33 are adapted to be provided with sliding frictional resistance against the movement in the rotation direction, and can be held at the positions where the side support portions 32 and 32 are rotated by the hinges. It is like that. Therefore, by changing the cushion pad 20 to the above-described shape state, the headrest 3 is held in a shape state in which the side of the occupant can be supported (side support) by both side portions.
Here, as shown in FIG. 1, stitched portions 10 </ b> A and 10 </ b> A extending in the vertical direction are formed on the skin cover 10 at two positions in the width direction across the center portion on the front side. As shown in FIG. 5, these stitched portions 10 </ b> A and 10 </ b> A are formed by partially folding the skin cover 10 inward and stitching the folded portions together. By the stitched portions 10A and 10A, the skin cover 10 is given directionality in the deformation direction, and is easily deformed so as to promote deformation in the direction in which the stitched portions 10A and 10A are folded. The stitched portions 10A and 10A are respectively arranged at the front positions of the rotation centers of the hinge mechanisms 33 and 33 that hinge-connect the side support portions 32 and 32 described above. That is, the sutured portions 10A and 10A are formed at positions along a fold shape extending in the vertical direction that enters the front side of the cushion pad 20 when the side support portions 32 and 32 are hinge-rotated. Therefore, as shown in FIG. 7, by bending and deforming both side portions of the cushion pad 20 by hinge rotation of the side support portions 32, 32, the skin cover 10 that is surface-bonded to the cushion pad 20 is stitched to the suture portions 10 </ b> A, 10 </ b> A. Can be deformed along the crease.
By the way, as shown in FIG. 7, when the above-described side support portions 32, 32 are rotated by hinges, the rear surface side portion of the cushion pad 20 assembled to the side support portions 32, 32 and the base Clearances T and T are formed between 31 and 31, respectively. However, the gaps T and T are tensile shapes in which the peripheral portion 10B of the skin cover 10 that is not bonded to the cushion pad 20 is pulled out from the hooking portion (the hooking member 11) with the base 31. It is to be covered with. That is, the skin cover 10 is easily deformed following the movement of bending the cushion pad 20 due to its stretchability, and the skin cover 10 can be connected to the base 31 without giving an abnormal load (tensile force) to the skin cover 10. The wide gaps T and T can be covered.

  Next, returning to FIG. 1, the rear cover 40 will be described. That is, the rear cover 40 is made of a synthetic resin and has a hollow shape having a cross-sectional “U” sign shape. As shown in FIG. 5, the rear cover 40 is assembled into the frame body 30 by being fitted into the frame shape. Thus, as shown in FIG. 3, the rear cover 40 can cover the opening 10C of the skin cover 10 from the rear side so that the internal structure such as the skeleton 30 cannot be seen from the outside. .

Next, returning to FIG. 1, the stay 50 will be described. In other words, the stay 50 is formed in a gate shape in which two rod-like leg members are connected to each other at the upper end portion to form a single connection. The stay 50 is fastened so that the front plate portion 31A is sandwiched between the fasteners 52 in a state where the mounting plate 51 fixed to the upper arm portion of the portal shape is in contact with the front plate portion 31A of the skeleton 30. Thus, the skeleton body 30 is fixed. Specifically, two screws 52S and 52S that can be fastened to fastening holes 51H and 51H formed in the attachment plate 51 are attached to the fastener 52, and these two screws 52S and 52S are attached to the front plate portion 31A. Are fastened to the fastening holes 51H and 51H, whereby the fastener 52 and the mounting plate 51 are fastened and fixed.
The through hole Ah formed in the front plate portion 31A by the penetration of the two screws 52S and 52S is sealed by the plate surface when the fastener 52 is fastened. There is no leakage.

Then, the usage method of a present Example is demonstrated.
That is, as shown in FIG. 2, the headrest 3 provided at the upper position of the seat back 2 is always in a state capable of supporting the occupant's rear head by its basic outer shape. However, as shown in FIG. 3, the headrest 3 maintains its bent shape by bending and deforming both side portions in the lateral width direction forward and inward. Thereby, the headrest 3 is hold | maintained as a shape state which can support a passenger | crew's temporal region by the both-sides part which carried out the bending deformation. At this time, as shown in FIG. 7, the skin cover 10 is deformed integrally with the cushion pad 20 without being peeled from the cushion pad 20 due to the surface-bonded configuration with the cushion pad 20 provided therein. To do. In addition, the skin cover 10 is given directionality in the deformation direction by the stitched portions 10A and 10A formed on the front side thereof, and is deformed with good creases along the stitched portions 10A and 10A. Therefore, even if the headrest 3 is changed to a design shape that can be side-supported, the headrest 3 can be deformed without wrinkles other than the stitched portions 10A and 10A.

As described above, according to the headrest 3 of the present embodiment, the skeleton body 30 including the hinge mechanisms 33 and 33 (deformation allowing mechanism) capable of changing the design shape of the headrest 3 is inserted into the cushion pad 20. Can be assembled easily by integral molding. Therefore, even when the side support mechanism (the skeleton body 30 and the hinge mechanisms 33 and 33) having a long lateral width is provided inside the headrest 3 as in the present embodiment, it can be easily assembled to the cushion pad 20. Then, by covering the skin cover 10 in a state of being integrally bonded to the cushion pad 20, it is possible to make it difficult for wrinkles to come to the skin cover 10 even if the design shape of the headrest 3 is changed.
Furthermore, by integrally molding the skin cover 10 with the cushion pad 20, the work of covering the skin cover 10 on the cushion pad 20 can be omitted, and the assembly can be performed easily. Therefore, as in this embodiment, the headrest 3 is partially cut out in order to avoid interference with a structure protruding from the upper portion of the seat back 2 (the drawer portion Sa of the seat belt device 2S). Even when it is formed in a complicated shape, the skin cover 10 can be easily assembled to the cushion pad 20.
Furthermore, by forming the stitched portions 10A and 10A along the crease formed in the cushion pad 20, the epidermis cover 10 can be deformed well along the crease shape formed in the cushion pad 20. it can.
Furthermore, the peripheral portion 10B of the skin cover 10 is configured to be engaged with the base 31 as a non-adhesive configuration with respect to the cushion pad 20, so that the skin cover 10 is deformed following the movement of folding the cushion pad 20. This makes it possible to cover the wide gaps T and T with the base 31 without applying an abnormal load to the skin cover 10.

Although the embodiment of the present invention has been described with one embodiment, the present invention can be implemented in various forms in addition to the above-described embodiment.
For example, in the above-described embodiment, a complicated shape is shown in which the lower portions on both ends in the width direction of the headrest are thinned, but the left and right shapes are shaped so that only one side is thinned. It may be. That is, in the present invention, when the skin cover is integrally formed with the cushion pad in a laminated shape, the headrest has a complicated shape that makes it difficult to cover the skin cover, including those with different left and right shapes. However, the skin cover can be easily assembled to the cushion pad.
In addition, the method of surface-bonding the skin cover to the cushion pad is not limited to the one by the integral molding shown in the above-described embodiment, and may be performed by a separate bonding means such as an adhesive. However, in this case, work for covering the skin cover on the cushion pad and work for bonding the surfaces to each other are required, which is troublesome.
The skin cover may be configured as a resin layer that is integrally formed in a laminated manner on the cushion pad by so-called multicolor molding.
Further, the side support mechanism shown in the above embodiment may be electrically moved.

FIG. 3 is an exploded perspective view of the headrest according to the first embodiment. It is an external appearance perspective view of the sheet | seat which assembled | attached the headrest. It is the perspective view showing the state which changed the headrest into the shape which can be side-supported. It is a front view of a headrest. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. It is sectional drawing which looked at the state which changed the headrest into the shape which can be side-supported in the VV cut surface of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat back 2S Seat belt apparatus Sa Pull-out part Sb Belt 3 Headrest 10 Epidermis cover 10A Sewing part 10B Peripheral part 10C Opening part 11 Hooking member 11N Hanging hole 20 Cushion pad 30 Skeletal body 31 Base 31A Front plate part Ah Through-hole 31B Frame portion Ba Insertion hole Bf Hook 32 Side support portion 33 Hinge mechanism 40 Rear cover 50 Stay 51 Mounting plate 51H Fastening hole 52 Fastening tool 52S Screw T Clearance

Claims (4)

A headrest that is provided at an upper position of a seat back of a vehicle seat and supports the back of the occupant,
A cushion pad made of synthetic resin that is formed by foam molding and forms a basic outer shape for receiving the back of the occupant;
And the skin cover disposed as a skin of the headrest by covering the cushion pad,
A skeleton that can be said built into the cushion pad, to vary the basic outer shape of the cushion pad by the shape change of the own
A deformation permissible mechanism provided in the skeleton body and capable of changing an incorporated shape of the skeleton body,
Skeleton having a deformation permitting mechanism is assembled integrally to the cushion pad by integral molding by insert with the cushion pad,
The skin cover is configured to be deformed integrally with the cushion pad by bonding its covering surface integrally with the cushion pad ,
The skeleton body provided with the deformation permission mechanism is configured as a side support mechanism capable of changing the basic outer shape of the cushion pad to a shape capable of supporting the occupant's temporal region,
The skeleton body is a base that is integrally assembled to an upper portion of a stay that serves as a support column of the headrest, and a side support portion that is hinged to both ends of the base in the lateral width direction by a hinge mechanism as the deformation allowing mechanism. And the both side support portions are bent and deformed in a manner that the both side portions in the lateral width direction of the cushion pad are moved inward toward the front of the headrest in accordance with the movement of rotating the hinges thereof. The both side portions of the cushion pad can be held in a shape state capable of supporting the occupant's temporal region,
The base of the skeletal body is disposed so as to be exposed on the rear surface side of the cushion pad, and the skin cover is formed in a rear surface opening shape in which a portion that hangs on the rear surface side of the cushion pad is opened. And the peripheral portion of the opening forming the rear surface opening shape is configured to be non-adhering to the cushion pad as an engagement portion to be engaged with the base exposed on the rear surface side of the cushion pad. Has been
A gap formed between a portion of the rear surface side of the cushion pad assembled to each side support portion and the base when the respective side support portions are rotated by hinges is not with respect to the cushion pad. A headrest characterized in that the peripheral portion of the skin cover that is bonded is covered with a tensile shape that is pulled out from a hooking portion with the base . The headrest according to claim 1,
The headrest, wherein the skin cover is integrally bonded to the cushion pad by integral molding with the cushion pad. The headrest according to claim 2,
The headrest is characterized in that the left and right shapes in the width direction are different from each other. The headrest according to any one of claims 1 to 3,
On the front side portion of the skin cover, a stitched portion is formed by folding the skin cover partially inward of the headrest shape and sewing the folded portions together.
The stitched portions are located at two positions in the width direction on the front side of the skin cover so as to follow a fold shape extending in the vertical direction entering the front side of the cushion pad when the side support portions are hinge-rotated. Each headrest is characterized by being formed .

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