JP6271999B2 - Headrest - Google Patents

Description

  The present invention relates to a headrest.

For the comfort and safety obtained by the headrest of the seat, it is important that the headrest is in an appropriate position with respect to the head of the user of the seat. Thus, a technique has been developed that can adjust not only the height of the headrest by the headrest pillar but also the position in the front-rear direction (see, for example, Patent Document 1).
According to such a headrest, the front and rear of the headrest are structured by using a structure of a ratchet portion as an engaged portion having a plurality of gear teeth and a lock member that meshes and engages with the plurality of gear teeth stepwise. The position of the direction is adjusted step by step, thereby improving the comfort and safety of the seat user.

JP 2012-250646 A

  By the way, in the headrest described in Patent Document 1, the engaged portion is disposed in the central portion between the left and right headrest pillars, and the engaged portion and the lock member are engaged at that portion. However, when considering the operation of the headrest, there has been a demand for engaging the engaged portion and the lock member in a more stable state.

  The subject of this invention aims at providing the headrest which can improve stability in the engagement state of a to-be-engaged part and a lock member.

In order to solve the above-described problems, the invention according to claim 1 is characterized in that the left and right headrest pillars separated from each other;
A stationary member provided on the headrest pillar;
A movable side member connected to the fixed side member via a movable mechanism, and movable in the front-rear direction with respect to the fixed side member;
A front-rear locking mechanism that locks and unlocks the movement of the movable-side member in the front-rear direction with respect to the fixed-side member,
The front and rear locking mechanism is
A plurality of engaged portions respectively arranged on the outer side in the width direction than the left and right headrest pillars;
A locking member having a plurality of engaging portions that respectively engage with the plurality of engaged portions and lock the movement of the movable side member ,
The lock member is made of metal and is disposed close to the fixed side member,
A buffer member is provided between the lock member and the fixed side member,
When the lock member moves toward the fixed side member, the buffer member is in contact with the fixed side member,
The locking member is
A held portion that is held by the fixed side member and is formed elongated along the width direction of the fixed side member;
The plurality of engaging portions arranged in parallel with the held portion and engaged with the engaged portion;
A plurality of connecting portions that connect both ends of the held portion and the respective ends of the plurality of engaging portions;
And it is provided in the fixed side member so as to surround the periphery of the fixed side member,
The buffer member, relative to said locking member, characterized that you have installed outwardly from the stationary member side.

The invention according to claim 2 is the headrest according to claim 1, wherein the movable side member has a front cover and a rear cover configured as an internal hollow case body by being combined with each other,
In the internal hollow part composed of the front cover and the rear cover, at least upper ends of the left and right headrest pillars, the fixed side member, the movable mechanism, and the front / rear lock mechanism are housed.
The plurality of engaged portions are arranged along the front-rear direction and are sandwiched between the front cover and the rear cover.

According to a third aspect of the present invention, in the headrest according to the first or second aspect , the front / rear lock mechanism is rotatably held by the movable side member, and has a rotation operation member that operates the lock member. Has
The buffer member is configured to increase a contact area between the lock member and the rotation operation member.

The invention according to claim 4 is the headrest according to any one of claims 1 to 3,
The fixed side member is
Pillar insertion holes that are formed at both ends in the width direction of the fixed side member, and through which the left and right headrest pillars are inserted in the vertical direction;
A slit formed along the vertical direction in at least one of the front surface and the rear surface of the fixed side member, and communicated with the pillar insertion hole,
The left and right headrest pillars include a pillar retaining portion that is slidably provided with respect to the slit when the headrest pillar is inserted into the pillar insertion hole.

According to a fifth aspect of the present invention, in the headrest according to any one of the first to fourth aspects, the front / rear lock mechanism biases the plurality of engaging portions toward the engaged portion. With components,
The fixed side member is
An accommodating portion for opening the front side of the stationary member and accommodating the biasing member;
And a retaining portion for restricting forward movement of the urging member accommodated in the accommodating portion.

Invention of Claim 6 is the headrest as described in any one of Claims 1-5. WHEREIN: The said stationary member is provided in the rear surface of the said stationary member, The holding | maintenance part which hold | maintains the said locking member is provided. Have
The holding portion is arranged at least behind the left and right headrest pillars.

According to a seventh aspect of the present invention, in the headrest according to the sixth aspect , the fixed side member is provided on a rear surface of the fixed side member, and the lock member is abutted along a direction in which the lock member is attached to the holding portion. It has a movement restricting portion that restricts movement of the lock member in a direction opposite to the mounting direction by contact.

According to the first aspect of the present invention, the movable side member can be locked and unlocked in the front-rear direction on the outer side in the width direction than the left and right headrest pillars. Thereby, the stability in the engaged state of the plurality of engaged portions and the lock member can be improved.
In addition, when the lock member moves toward the fixed side member, the buffer member abuts on the fixed side member. Therefore, the lock member is controlled by the buffer member while restricting the movement range of the lock member. Generation of abnormal noise can be suppressed by preventing direct contact with the fixed side member.
Furthermore, since the buffer member is attached to the lock member provided so as to surround the fixed side member from the fixed side member side toward the outside, the buffer member is removed from the lock member. The fixed side member is present in the direction of removal. Therefore, it can suppress that the said buffer member remove | deviates from the said lock member in the state which provided the said lock member in the said fixed side member.

  According to the second aspect of the present invention, the movable side member that moves in the front-rear direction is configured by the front cover and the rear cover, and the plurality of engaged portions are formed by the front cover and the rear cover. Since it can clamp, the support rigidity of the said to-be-engaged part can be improved.

According to the invention described in claim 3 , the buffer member is configured to increase a contact area between the lock member and the rotation operation member, and thus the lock by the rotation operation member. The operating efficiency of the member can be improved.

According to the fourth aspect of the present invention, the pillar retaining portion can be disposed in the front-rear direction, so that the pillar retaining portion does not interfere with the operation of the front-rear locking mechanism located outside the left and right headrest pillars. However, it can suppress that the said fixed side member remove | deviates from the said right and left headrest pillar.

According to the fifth aspect of the present invention, the biasing member can be easily accommodated in the accommodating portion from the front surface side of the fixed-side member, and the urging member is pulled out of the accommodating portion by the retaining portion. Can be suppressed.

According to invention of Claim 6 , the said locking member can be hold | maintained in the vicinity of the said front-rear locking mechanism by the said holding part. Accordingly, the lock member can be engaged with the engaged portion while suppressing deformation of the lock member.

According to the seventh aspect of the present invention, the movement restricting portion can restrict the lock member from moving in the direction opposite to the mounting direction.

It is a perspective view which shows a headrest. It is a perspective view which shows the internal mechanism of a headrest. It is a perspective view which shows the headrest of the state which mounted | wore the front side cover. It is a perspective view which shows the headrest of the state which mounted | wore the back cover. It is a perspective view which shows the rear surface side and engaged part of a front cover. It is a perspective view which shows the front side and engaged part of a rear cover. It is a plane sectional view showing a headrest. It is a perspective view which shows a locking member and a buffer member. It is a front view which shows the internal mechanism of a headrest. It is the schematic which shows the structure of the center crossing part of X link mechanism. It is the schematic which shows the example of attachment of a connection member. It is a sectional side view which shows the internal mechanism of a headrest. It is a perspective view from the planar view side which shows the internal mechanism of a headrest. It is sectional drawing which shows the example of attachment of a skin material. It is a side view which shows the internal mechanism of the headrest before operation | movement. It is a side view which shows the internal mechanism of the headrest after operation | movement.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 to 16, the headrest 1 of the present embodiment includes a pair of left and right headrest pillars 2 and 2, a pair of left and right holder portions 3 and 3, a stationary member 4, and a movable side. A member 5, a movable mechanism, a front / rear lock mechanism, a vertical lock mechanism, and an operation unit 9 are provided. The headrest 1 also includes a cushion pad 100 and a skin material 110 provided around the headrest 1.
And the said headrest 1 is mounted | worn with the upper end part of the seat back of a vehicle seat.
Note that the front-rear, up-down, left-right directions in the present embodiment are in accordance with the vehicle seat and the direction of the vehicle.

The left and right holder portions 3 and 3 are attached to a seat back frame which is a framework of the seat back.
The left and right headrest pillars 2, 2 are provided to extend below the headrest 1 and are held by the left and right holder portions 3, 3. That is, the headrest 1 is attached to the seat back frame via the left and right headrest pillars 2 and 2 and the left and right holder portions 3 and 3.
The left and right headrest pillars 2 and 2 are set to have the same diameter, and at least one of the left and right headrest pillars 2 and 2 is formed with a plurality of notches 15 at intervals in the length direction. ing.

The left and right headrest pillars 2 and 2 are respectively held by the left and right holder portions 3 and 3 and are movable in the vertical direction along the left and right holder portions 3 and 3.
Each of the left and right holder portions 3 and 3 includes a cylindrical main body 3a that holds the left and right headrest pillars 2 and 2, a cover body 3b that covers the cylindrical main body 3a, and an upper end portion of the cylindrical main body 3a. And a head 3c.
The head 3c is provided with a lock portion 3d that engages with the plurality of notches 15 of the left and right headrest pillars 2 and 2 to prevent the left and right headrest pillars 2 and 2 from coming out. Yes.

  The left and right headrest pillars 2 and 2 are pillars that are slidable with respect to slits 20a and 20a of the fixed side member 4 to be described later when inserted into pillar insertion holes 20 and 20 of the fixed side member 4 to be described later. It has retaining portions 2a, 2a. The pillar retaining portions 2a, 2a are disposed in the front-rear direction with respect to the headrest pillars 2, 2. The fixed side member 4 is disengaged from the left and right headrest pillars 2 and 2 while preventing the pillar retaining portions 2a and 2a from interfering with the operation of the front and rear locking mechanism outside the left and right headrest pillars 2 and 2. This can be suppressed. Further, the pillar retaining portions 2a and 2a also function as so-called detents that suppress the left and right headrest pillars 2 and 2 from rotating in the circumferential direction.

The fixed side member 4 is in a state in which the left and right headrest pillars 2 and 2 are provided at both left and right ends, and is provided on the seat back frame via the left and right headrest pillars 2 and 2. is there.
The fixed side member 4 is movable in the vertical direction along the left and right headrest pillars 2 and 2.

The movable side member 5 is movable in the front-rear direction with respect to the fixed side member 4 and is connected to the fixed side member 4 via the movable mechanism. More specifically, the movable side member 5 is connected to the fixed side member 4 through a movable mechanism, and is movable in a direction of separating forward and a direction of returning to the fixed side member 4. Is.
The movable member 5 includes a front cover 30 and a rear cover 31 that are combined with each other to form an internal hollow case body. In the internal hollow portion composed of the front cover 30 and the rear cover 31, at least the upper ends of the left and right headrest pillars 2, 2, the fixed side member 4, the movable mechanism, and the front and rear lock mechanism are accommodated. .

The movable mechanism connects the fixed side member 4 and the movable side member 5. For example, both end portions in the width direction are rotatably supported by the fixed side member 4 and the movable side member 5. A link mechanism having a plurality of links 6 and 7 is employed.
In this embodiment, an X link mechanism is particularly employed. The X-link mechanism includes a first link 6 (hereinafter referred to as an inner link 6) and a second link 7 (hereinafter referred to as an outer link 7) that are rotatably connected via a central cross connecting portion 8.

  The front / rear locking mechanism locks and unlocks the movement of the movable side member 5 in the front / rear direction relative to the fixed side member 4, and includes a plurality of engaged portions 10, 10, and the engaged portion 10 , 10, a biasing member 12 that biases engaging portions 71, 71 (described later) of the locking member 11 toward the engaged portions 10, 10, and the movable side member 5 and a rotation operation member 13 for operating the lock member 11.

  The vertical locking mechanism locks and unlocks the stationary member 4 at a plurality of vertical positions with respect to the left and right headrest pillars 2 and 2. In addition, this vertical lock mechanism has a vertical lock member 14 described later.

The operation unit 9 is exposed from the outer surface of the headrest 1 and operates the front / rear lock mechanism and the vertical lock mechanism simultaneously. More specifically, the movable side member 5 in a state where the movement in the front-rear direction is locked is unlocked via the rotation operation member 13 and the movement in the vertical direction is locked. An operation for releasing the lock of the stationary member 4 is performed.
The operation direction of the operation unit 9 is set along the left-right width direction. The operation of the operation unit 9 itself is performed manually or automatically. In the present embodiment, a manual operation form is adopted.
The operation unit 9 according to the present embodiment is a button 9 that can be operated to the front / rear locking mechanism and the vertical locking mechanism by being pushed into the headrest 1.

  Next, the fixed side member 4, the movable side member 5, and the X link mechanism will be described in more detail.

(Fixed side member)
The fixed side member 4 is made of resin, and is formed in a block shape as shown in FIGS. 2, 9, 13, etc., and a pair of left and right pillar holding portions 4a, 4b, a rear surface connecting portion 4c, 4 d of connecting parts, 4 e of connecting parts, several holding parts 21 and 21, several mounting parts 23 and 23, several accommodating parts 24 and 24, retaining parts 24a and 24a, several support parts 25, 26, a lock holding portion 27, and a protruding rib 28. In addition, as for the said fixed side member 4, all each part is integrally formed.

The left and right pillar holding portions 4 a and 4 b are provided at both left and right end portions of the fixed side member 4 and constitute left and right side portions of the fixed side member 4. The left and right pillar holding portions 4a and 4b hold the left and right headrest pillars 2 and 2, respectively, so that the fixed side member 4 is moved along the left and right headrest pillars 2 and 2. It can move up and down.
The left and right pillar holding portions 4a and 4b penetrate the left and right pillar holding portions 4a and 4b in the length direction (vertical direction), and the pillar insertion holes 20 and the right and left headrest pillars 2 and 2 are inserted therein. 20 is formed.

Further, at least one of the front surface and the rear surface of the fixed-side member 4 is formed with slits 20a and 20a that communicate with the pillar insertion holes 20 and 20 along the vertical direction. In this embodiment, it is formed on both the front surface and the rear surface.
The slits 20a, 20a are provided with the pillar retaining portions 2a, 2a of the left and right headrest pillars 2, 2, respectively. That is, the pillar retaining portions 2a, 2a are provided so as to protrude in the front-rear direction with respect to the headrest pillars 2, 2. The pillar retaining portions 2a, 2a are provided and fixed to the headrest pillars 2, 2 after the left and right headrest pillars 2, 2 are inserted into the pillar insertion holes 20, 20, respectively.

The rear surface connecting portion 4c is a plate-like body that is provided between the left and right pillar holding portions 4a and 4b and connects the left and right pillar holding portions 4a and 4b.
In addition, a plurality of holding portions 21 and 21 for holding a held portion 70 of the lock member 11 described later are provided on the rear surface side of the rear surface connecting portion 4c. These holding portions 21 and 21 are formed in an upward hook shape in a side view, and are disposed at least behind the left and right headrest pillars 2 and 2, respectively.

  Similarly, a center holding portion 21a that holds the center of the held portion 70 of the lock member 11 is provided on the rear surface side of the rear surface connecting portion 4c. The central holding portion 21a is formed in an upward hook shape in a side view, and is arranged side by side with the plurality of holding portions 21 and 21 in the left-right direction.

Furthermore, a plurality of movement restricting portions 21b, 21b are provided on the rear surface side of the rear surface connecting portion 4c. The movement restricting portion 21b restricts the lock member 11 from moving in a direction opposite to the attaching direction when the lock member 11 abuts along a direction in which the lock member 11 is attached to the holding portions 21 and 21. It is formed in a convex shape so as to protrude rearward from the rear surface.
The plurality of movement restricting portions 21b and 21b are disposed between the plurality of holding portions 21 and 21 and the central holding portion 21a, respectively.
In a side view, there is a gap between the tips of the plurality of holding portions 21 and 21 and the central holding portion 21a and the tips of the plurality of movement restricting portions 21b and 21b, and the places where the gaps are left. The held portion 70 of the lock member 11 can be mounted.

  The connecting portion 4d is a plate-like body that is provided between the upper ends of the left and right pillar holding portions 4a and 4b and connects the upper end portions of the left and right pillar holding portions 4a and 4b. The upper surface of the connecting portion 4d is flush with the upper surfaces of the left and right pillar holding portions 4a and 4b.

  The connecting portion 4e is a plate-like body that is provided between the lower ends of the left and right pillar holding portions 4a and 4b and connects the lower end portions of the left and right pillar holding portions 4a and 4b. Further, the lower surface of the connecting portion 4e is flush with the lower surfaces of the left and right pillar holding portions 4a and 4b.

A portion of the fixed side member 4 surrounded by the left and right pillar holding portions 4a and 4b and the connecting portions 4d and 4e is a concave portion 22 formed in a concave shape. More specifically, it is between the opposing surfaces of the left and right pillar holding portions 4a, 4b, on the front side of the rear surface connecting portion 4c, on the lower surface side of the connecting portion 4d, and The space which is the upper surface side of the connection part 4e is pointed out.
As shown in FIG. 7, the movable portion is accommodated in the concave portion 22 when the fixed side member 4 and the movable side member 5 approach each other.

As shown in FIGS. 2, 7, 9 and the like, mounting portions 23, 23 to which engaged portions 10, 10 constituting the front / rear locking mechanism are mounted are provided on the left and right side surfaces of the rear surface connecting portion 4c. Protrusively to the side.
Through holes 23a and 23b are formed in the mounting portions 23 and 23 at positions corresponding to the first projecting portion 60 and the second projecting portion 61 (described later) of the engaged portion 10, and the through holes 23a, The first protrusion 60 and the second protrusion 61 are inserted through 23b, respectively. That is, the through holes 23a and 23b are formed so as to penetrate the mounting portion 23 in the front-rear direction.
In view of such points, the mounting portions 23 and 23 to which the engaged portion 10 constituting the front and rear locking mechanism is mounted are the left and right side surfaces of the rear surface connecting portion 4c, that is, the left and right headrest pillars 2 and 2. It will be arranged outside in the width direction. In other words, the engaged portions 10 and 10 are disposed on the outer side in the width direction than the left and right headrest pillars 2 and 2, respectively.

As shown in FIGS. 9 and 12, the plurality of accommodating portions 24 and 24 are for opening the front side of the fixed side member 4 to accommodate the biasing member 12. More specifically, the housing portions 24, 24 are box-shaped bodies integrally formed on the surface on the concave portion 22 side of the left and right pillar holding portions 4a, 4b and the rear surface connecting portion 4c.
The retaining portion 24 a is for restricting the forward movement of the urging member 12 accommodated in the accommodating portion 24. The retaining portion 24 a is integrally formed so as to protrude downward from the front end of the upper end portion of the housing portion 24.
The biasing member 12 accommodated in each of the plurality of accommodating portions 24, 24 is a coil spring, and one end portion is a hook portion 12 a formed in a hook shape. The hook portion 12 a is connected to the engaging portion 71. Be hooked. The other end portion is set so as to be caught by the retaining portion 24 a when the biasing member 12 is accommodated in the accommodating portion 24.
That is, the engaging portions 71 and 71 are biased by the coil springs 12 and 12 to a plurality of teeth 60a.

The plurality of support portions 25, 26 are rotatably connected to the inner link 6 and the outer link 7 constituting the X link mechanism, and further support the inner link 6 and the outer link 7.
The plurality of support portions 25 and 26 are respectively provided above and below a surface where the left and right pillar holding portions 4a and 4b face each other. That is, it is in a state of being arranged at the four corners of the concave portion 22.
And the support parts 25 and 25 arrange | positioned at the upper side are integrally formed with the said left and right pillar holding | maintenance parts 4a and 4b and the said rear surface connection part 4c. The support portions 26, 26 disposed on the lower side are integrally formed with the left and right pillar holding portions 4a, 4b and the rear surface connection portion 4c.

In addition, insertion holes 25 a into which the connection members S are inserted are formed in the upper support portions 25, 25. The connection member S is assembled to the fixed side member 4 from the side opposite to the side where the operation unit 9 is provided. Therefore, the insertion hole 25a is formed so as to penetrate the pillar holding portion 4b on the side opposite to the operation portion 9 in the left-right direction. Note that the insertion holes 25a of the plurality of upper support portions 25, 25 are circular holes.
That is, the connecting member S is inserted so as to connect the link 6 from the insertion hole 25a opened on the side surface of one of the left and right pillar holding portions 4a and 4b.
The connecting member S is configured to rotatably connect the inner link 6 and the outer link 7 to the plurality of support portions 25 and 26, and in the present embodiment, a metal shaft (rotating shaft). Is used. That is, the connecting member S is provided so as to penetrate the link 6 (7) and the support portions 25, 25.

Further, the plurality of lower support portions 26 and 26 are formed to be longer in the vertical direction than the plurality of upper support portions 25 and 25.
The plurality of support portions 26, 26 are formed with holes 26a into which the connecting member S is inserted on the surface of the lower support portions 26, 26 on the concave portion 22 side. The hole portions 26a of the lower support portions 26, 26 are elongated holes (slits) that are elongated in the vertical direction along the lower support portions 26, 26. And the said outer side link 7 is connected to the said some support parts 26 and 26 via the connection member S inserted in the said hole parts 26a and 26a. That is, of the rear end portions of the inner link 6 and the outer link 7, the lower end portion is supported so as to be slidable in the vertical direction with respect to the support portions 26 and 26.
Further, as described above, the connection member S is assembled to the fixed side member 4 from the side opposite to the side where the operation unit 9 is provided. Therefore, a through hole 26b (circular hole) for assembling the connection member S is formed at the lowermost portion of the hole portion 26a formed in the support portion 26 on the pillar holding portion 4b side among the plurality of support portions 26, 26. The pillar holding portion 4b is formed so as to penetrate in the left-right direction.
And the space | interval of the rear side edge part of the said inner side link 6 and the said outer side link 7 is the said inner link 6 and the said time rather than when the edge part (back edge part of the outer side link 7) located in the downward direction slides. The time when each end portion of the outer link 7 is assembled to the fixed side member 4 (each support portion 25, 26) is set wider.

  The lock holding portion 27 holds the upper and lower lock members 14 constituting the upper and lower lock mechanism, and is provided in the vicinity of the lower end portions of the left and right pillar holding portions 4a and 4b. Of the left and right pillar holding portions 4a and 4b, the upper and lower lock members 14 are provided on either side, and in the present embodiment, are on the left side of the headrest 1. That is, the upper and lower lock members 14 are held by the lock holding portion 27 on the operation portion 9 side.

As shown in FIGS. 2, 9 and the like, the protruding rib 28 is a rib formed in a frame shape protruding forward at the center of the upper end of the front surface side of the rear surface connecting portion 4c.
The frame-shaped protruding ribs 28 include a plurality of vertical ribs 28a formed integrally with the rear surface connecting portion 4c and the connecting portion 4d, and a plurality of members formed integrally with the rear surface connecting portion 4c and the plurality of vertical ribs 28a. It consists of a lateral rib 28b.
The protruding rib 28 is provided at the center between the plurality of support portions 25, 25. On the other hand, at the center of the upper end portion (rear end portion) of the inner link 6, a notch portion 6a into which the protruding rib 28 is fitted is formed. Then, when the inner link 6 is connected by the connection member S by the plurality of support portions 25, 25, the protruding rib 28 is fitted into the notch portion 6a. That is, the fixed side member 4 not only supports the inner link 6 by the plurality of support portions 25, 25, but further supports the center in the width direction of the inner link 6 positioned on the fixed side member 4 side. It becomes a state.

(Movable side member)
The movable member 5 is disposed on the head side of the occupant and is movable in the front-rear direction with respect to the fixed member. More specifically, as shown in FIGS. 1 to 7, 15, and 16, the movable side member 5 is movable back and forth with respect to the fixed side member 4.
The movable side member 5 is made of resin, and the front cover 30, the rear cover 31, the bottom edge covers 32 and 32, the holding portion 33, the button attaching portion 34, the plurality of support portions 35, 36, a guide contact portion 37, and a protruding rib 38. In the movable side member 5, the front cover 30, the rear cover 31, and the bottom edge covers 32, 32 are formed as separate bodies.
Further, the front cover 30 and the rear cover 31 can be combined to form an internal hollow case body.

The front cover 30 is for supporting the head. The front cover 30 includes a front surface portion 30a and a peripheral side surface portion 30b provided rearward from the upper, lower, left and right peripheral end portions of the front surface portion 30a. Moreover, each part which comprises the front side cover 30 is integrally formed.
In addition, as shown in FIG. 5, between the rear surface of the front surface portion 30a and the peripheral side surface portion 30b, the boundary portion between the front surface portion 30a and the peripheral side surface portion 30b and the load on the head are effectively applied. Reinforcing ribs for supporting are appropriately provided.

The rear cover 31 includes a rear surface portion 31a and a peripheral side surface portion 31b provided forward from the upper, lower, left and right peripheral end portions of the rear surface portion 31a. The case body is configured by connecting and fixing the peripheral side surface portion 31 b of the rear cover 31 and the peripheral side surface portion 30 b of the front cover 30.
As shown in FIG. 6, ribs for reinforcing the boundary portion between the rear surface portion 31a and the peripheral side surface portion 31b are appropriately provided between the rear surface of the rear surface portion 31a and the peripheral side surface portion 31b. .
The peripheral side surface portion 30b of the front cover 30 and the peripheral side surface portion 31b of the rear cover 31 are fitted and connected by adopting a fitting structure, but are not particularly limited and are conventionally known. This technology shall be adopted.

As shown in FIG. 5, the front cover 30 is provided at a position corresponding to a base end portion 63 of the engaged portion 10 described later, and includes a base end storage portion 30 d in which the base end portion 63 is stored. Further, the base end storage portion 30 d is formed to protrude from the rear surface of the front cover 30, and has a wall portion 30 e surrounding the base end portion 63.
As shown in FIG. 13, the rear cover 31 is provided at a position corresponding to a tip of a first protrusion 60 and a tip of a second protrusion 61 of the engaged portion 10 described later, and the tip is stored. Tip storage portions 31d and 31d. Further, the tip storage portions 31 d and 31 d are formed to protrude from the front surface of the rear cover 31 and have wall portions 31 e and 31 e surrounding the tip of the first protrusion 60 and the tip of the second protrusion 61.
That is, the engaged portion 10 is disposed along the front-rear direction, and the base end portion 63 is held by the front cover 30, and the distal end of the first projecting portion 60 and the distal end of the second projecting portion 61 are arranged. Are held by the rear cover 31. The engaged portion 10 is sandwiched between the front cover 30 and the rear cover 31.

  The bottom edge covers 32 and 32 are respectively fitted into two long holes (described later) formed on the lower surface of the case body formed by connecting the front cover 30 and the rear cover 31. . The bottom edge cover 32 includes a cylindrical portion 32a that is inserted into the elongated hole, and a flange portion 32b that is provided on the lower edge portion of the cylindrical portion 32a and contacts the lower surface of the case body.

Further, notches 30c and 31c for inserting the left and right headrest pillars 2 and 2 and the bottom edge covers 32 and 32 are formed on the lower surface side of the peripheral side surface portion 30b and the peripheral side surface portion 31b, respectively. ing. The notches 30c and 31c are formed in a so-called half-divided long hole, and the long hole is formed in the lower surface of the case body by connecting the peripheral side surface part 30b and the peripheral side surface part 31b. It can be done.
Two such long holes are formed in the lower surface of the case body, and the length direction thereof is arranged along the front-rear movement direction of the movable member 5. Further, the cylindrical portion 32 a is also arranged so that the length direction thereof is along the longitudinal movement direction of the movable side member 5.

The holding portion 33 holds a rotation shaft portion 82 of the rotation operation member 13 which will be described later. As shown in FIGS. 5, 6, and 9, the front cover 30 and the rear cover 31 are provided. One of the left and right side surfaces of the peripheral side surface portions 30b and 31b is provided on the inner surface side (inside the inner hollow portion of the case body).
If it demonstrates in detail, the holding | maintenance part 33 will be provided with insertion holding | maintenance part 33a, 33a and the control part 33b.
The insertion holding portions 33a and 33a are provided on the front cover 30 side and the rear cover 31 side, respectively, and have holes into which the end portions of the rotating shaft portion 82 are inserted.
The restricting portion 33b is provided on each of the front cover 30 side and the rear cover 31 side, and restricts the rotation operation member 13 from moving to the operation portion 9 side. That is, the restriction portion 33b is formed in accordance with the shape of the rotation operation member 13, and when the operation is not performed, the restriction portion 33b contacts the rotation operation member 13 to move the rotation operation member 13. Is regulated.

As shown in FIGS. 2 to 5, the button attachment portion 34 is for attaching the button 9 as the operation portion 9 to the front cover 30 and the rear cover 31, and the front cover 30 and It is arranged on the side of the rear cover 31.
The button mounting portion 34 is a cylindrical body that protrudes from the side surfaces of the front cover 30 and the rear cover 31, and has a cylindrical front side portion 34 a provided on the front cover 30 side and the rear cover 31 side. A cylindrical rear side part 34b provided.
The button 9 is attached to the button attachment portion 34 so as to be surrounded by the cylindrical front side portion 34a on the front cover 30 side and the cylindrical rear side portion 34b on the rear cover 31 side.

The plurality of support portions 35 and 36 are configured such that the inner link 6 and the outer link 7 constituting the X link mechanism are rotatably connected, and further the inner link 6 and the outer link 7 are supported.
The plurality of support portions 35 and 36 are provided at positions corresponding to the front end portions of the inner link 6 and the outer link 7 on the rear surface of the front cover 30. The plurality of support portions 35 and 36 are disposed on both sides in the left-right width direction and both sides in the up-down direction of the rear surface of the front cover 30.
That is, they are arranged at four locations on the rear surface of the front cover 30. The front end portion of the outer link 7 is connected to the support portions 35, 35 arranged on the upper side, and the front end portion of the inner link 6 is connected to the support portions 36, 36 arranged on the lower side.

Further, insertion holes 35a into which the connection members S are inserted are formed in the left and right directions in the plurality of upper support portions 35, 35. Note that the insertion holes 35a of the plurality of upper support portions 35, 35 are circular holes.
Of the left and right side surfaces of the peripheral side surface portion 30b of the front cover 30, on the side surface opposite to the operation portion 9, on the extension lines of the insertion holes 35a, 35a of the plurality of upper support portions 35, 35. A through hole 30f is formed.
Then, the connecting member S is inserted into the insertion holes 35a of the plurality of support portions 35, 35 so that the front end portion of the outer link 7 is connected to the plurality of support portions 35, 35 from the through hole 30f. Is done. That is, the connecting member S is provided so as to penetrate the outer link 7 and the support portion 35 on the through hole 30 f side among the support portions 35 and 35.

The plurality of lower support portions 36 and 36 are formed to be longer in the vertical direction than the plurality of upper support portions 35 and 35.
The plurality of support portions 36, 36 are formed with holes 36a into which the connecting member S is inserted on the opposing surfaces of the plurality of lower support portions 36, 36. The hole portions 36a of the plurality of lower support portions 36, 36 are elongated holes (slits) that are long in the vertical direction along the plurality of lower support portions 36, 36. And the said inner side link 6 is connected to the said some support parts 36 and 36 via the connection member S inserted in the said hole parts 36a and 36a. That is, of the front end portions of the inner link 6 and the outer link 7, the lower end portion is supported so as to be slidable in the vertical direction with respect to the support portions 36 and 36.
Further, the connecting member S is assembled to the front cover 30 from the side opposite to the side where the operation unit 9 is provided. Therefore, a through hole 30g is formed on the side surface opposite to the operation portion 9 among the left and right side surfaces of the peripheral side surface portion 30b of the front cover 30. Further, among the plurality of support portions 36, 36, the support portion 36 opposite to the operation portion 9 is formed with a through hole 36b positioned on an extension line of the through hole 30g. The through hole 36b of the support portion 36 is formed so as to penetrate the support portion 36 in the left-right direction at the lowermost portion of the hole portion 36a.
And the space | interval of the front side edge parts of the said inner link 6 and the said outer link 7 is the said inner link 6 and the said outer link rather than when the edge part (front edge part of the inner link 6) located in the downward direction slides. 7 is set wider when assembling the respective end portions 7 to the respective support portions 35, 36.

The relationship between the fixed side member 4 and the front cover 30 and the inner link 6 and the outer link 7 will be described in more detail. As described above, the front end portions of the inner link 6 and the outer link 7 are described. Of the rear end portions, the upper end portion or the lower end portion (in this embodiment, the lower end portion) is slidably supported in the vertical direction with respect to the lower support portions 26 and 36. Has been.
In addition, the interval between the front end portions of the inner link 6 and the outer link 7 and the interval between the rear end portions of the inner link 6 and the outer link 7 are such that the lower end portion is the support portion 26. , 36 is set wider when assembling the end portions of the inner link 6 and the outer link 7 to the front cover 30 and the fixed side member 4, respectively, than when sliding along the hole portions 26a, 36a. Has been.
That is, the connecting member S is inserted from the through holes 26b and 36b of the plurality of support portions 26 and 36 when the lower ends of the inner link 6 and the outer link 7 are connected to the plurality of support portions 26 and 36. Is done. However, the connecting member S is set so as not to be lowered to the positions of the through holes 26b and 36b after assembly.

As shown in FIGS. 4 to 6, the guide abutting portion 37 abuts on the fixed side member 4 accommodated in the case body including the front cover 30 and the rear cover 31 and moves the movable side. The movement of the member 5 is guided.
The guide contact portion 37 is provided on at least one of the inner surface side of the upper end portion and the inner surface side of the lower end portion of the case body. However, in the present embodiment, a plurality of the guide contact portions 37 are provided on both the inner surface side of the upper end portion and the inner surface side of the lower end portion of the case body.
The guide contact portion 37 includes front guide contact portions 37 a and 37 a provided on the peripheral side surface portion 30 b of the front cover 30 and a rear guide contact provided on the peripheral side surface portion 31 b of the rear cover 31. Parts 37b and 37b.
The stationary member 4 is arranged so as to fit between the upper and lower guide contact portions 37 when it is accommodated in the case body including the front cover 30 and the rear cover 31. . Further, when the movable side member 5 is moved in the front-rear direction, the upper and lower guide contact portions 37, 37 are in a state of moving while always contacting the upper and lower end portions of the fixed side member 4.

As shown in FIGS. 3 to 5 and the like, the protruding rib 38 is formed on the rear surface side of the front surface portion 30a of the front cover 30 from the upper surface side of the peripheral side surface portion 30b via the front surface portion 30a. It is the rib formed to the lower surface side. Further, there are a plurality of the protruding ribs 38, and the plurality of protruding ribs 38, 38 are arranged at intervals.
The protruding ribs 38 are provided in the center between the plurality of support portions 35. On the other hand, in the center of the upper end portion (front end portion) of the outer link 7, a notch portion 7a into which the protruding ribs 38 are fitted is formed. When the outer link 7 is connected by the connection member S by the plurality of support portions 35, 35, the protruding ribs 38, 38 are fitted into the notch portion 7a. That is, the movable member 5 not only supports the outer link 7 by the plurality of support portions 35, 35, but further supports the center in the width direction of the outer link 7 located on the movable member 5 side. It becomes a state.
When the projecting ribs 38, 38 are fitted into the notches 7a, the outer surfaces of the projecting ribs 38, 38 are in contact with both side surfaces of the notches 7a.

(X link mechanism)
Among the X link mechanisms, as shown in FIGS. 2 to 4, etc., the inner link 6 has an upper end portion (rear end portion) disposed on the fixed side member 4 side and a lower end portion (front end portion) of the inner link 6. It is a link arranged on the movable side member 5 side. Further, the lower end side is inserted through an insertion hole 51 (described later) of the outer link 7.
The outer link 7 is a link having an upper end (front end) disposed on the movable member 5 side and a lower end (rear end) disposed on the fixed member 4 side.
The front and rear directions of the inner link 6 and the outer link 7 may be reversed. Further, the X link mechanism is made of resin except for the connection member S.

Further, the upper end portion of the inner link 6 is disposed so as to be positioned between a plurality of upper support portions 25, 25 disposed on both the left and right sides of the fixed side member 4.
A lower end portion of the outer link 7 is disposed between a plurality of lower support portions 26 and 26 disposed on the left and right sides of the stationary member 4.
Further, the lower end portion of the inner link 6 is disposed so as to be positioned between a plurality of lower support portions 36 disposed on the left and right sides of the movable side member 5.
An upper end portion of the outer link 7 is disposed so as to be positioned between a plurality of upper support portions 35 disposed on the left and right sides of the movable side member 5.
Further, as described above, the upper ends of the inner link 6 and the outer link 7 are supported by the fixed side member 4 and the movable side member 5 at the center in the width direction, respectively.

The inner link 6 and the outer link 7 are bent in a side view. That is, when the inner link 6 and the outer link 7 are folded as shown in FIG. 15, the inner link 6 and the outer link 7 are connected to the fixed side member 4. The shape is suitable for fitting in the concave portion 22 appropriately.
The inner link 6 and the outer link 7 are rotatably connected via the central cross connecting portion 8.
Note that the X link mechanism inevitably has a place where one link and the other link overlap. Therefore, the cross-connecting portion 8 is disposed at a location where the inner link 6 and the outer link 7 that are inevitably generated in configuring the X-link mechanism overlap.

Further, as shown in FIGS. 9 and 10, the cross-connecting portion 8 is formed on a line connecting connecting members S and S provided at the upper end portion and the lower end portion of the inner link 6 and the upper end of the outer link 7. It arrange | positions on the line | wire which connects the connection members S and S provided in the part and the lower end part, respectively.
The cross connection portion 8 includes a hole portion 8a, the connection member S that is a shaft inserted into the hole portion 8a, a stopper portion 8b, and a retaining claw portion 8c.
The hole 8a penetrates the inner link 6 and the outer link 7 in the width direction.
The stopper portion 8 b is provided on the insertion direction side of the connecting member S in both widthwise end portions of the cross connection portion 8. That is, the stopper portion 8b is disposed so as to overlap the hole portion 8a.
A plurality of the retaining claws 8 c are provided on the opposite side to the insertion direction of the connection member S in both widthwise ends of the cross connection portion 8. The retaining claws 8c, 8c have elasticity, and are arranged so that their tip portions overlap the hole 8a.
When the connecting member S is inserted into the hole 8a, the connecting member S is inserted toward the hole 8a from the gap between the retaining claws 8c and 8c, and is opposite to the insertion direction. Insert until the end exceeds the tip of the retaining claws 8c, 8c. Since the retaining claws 8c, 8c have elasticity, they are elastically deformed when the connecting member S is inserted, and are elastically restored when the opposite end exceeds the distal ends of the retaining claws 8c, 8c. .
Since the cross connecting portion 8 is configured as described above, the inner link 6 and the outer link 7 are connected to each other so as to be rotatable about the connecting member S as a rotation axis.

The inner link 6 of the present embodiment is formed so as to be wide in the left-right direction as a whole. From the lower end portion inserted through the insertion hole 51 of the outer link 7 to the center portion, the inner link 6 is more lateral than the upper end portion. Is formed narrow.
The inner link 6 includes a plurality of connection portions 42 provided at the upper and lower ends. The plurality of connection portions 42 are connected to the support portions 25 and 25 above the fixed side member 4 and the support portions 36 and 36 below the movable side member 5, and are connected to the upper support portions 25 and 25 and below the support side members 5. The portions supported by the support portions 36, 36 are indicated. Further, a through hole (circular hole) into which the connection member S is inserted is formed in the connection part 42 so as to penetrate the connection part 42 in the left-right width direction.

The through holes formed in the connection portion 42 at the upper end portion are disposed on the extension lines of the insertion holes 25 a and 25 a formed in the plurality of support portions 25 and 25 on the upper side of the fixed side member 4. The connecting member S is inserted into the circular holes of the upper support portions 25 and 25 and the circular holes of the connection portion 42 on the upper end side. That is, the upper end portion of the inner link 6 is rotatably connected to the stationary member 4 via the connection member S with the connection member S as a rotation axis.
Since the upper end portion of the inner link 6 has a notch portion 6a into which the protruding rib 28 of the fixed side member 4 is fitted, the connection portion 42 at the upper end portion of the inner link 6 sandwiches the notch portion 6a. It is in the state where two were provided.
Further, the connection member S and the protruding rib 28 are set so as not to interfere with each other in the notch 6a. That is, the projecting dimension of the projecting rib 28 is set so as not to contact the connecting member S.

Further, a through hole (circular hole) is similarly formed in the connecting portion 42 on the lower end side of the inner link 6.
A connecting member S is inserted into the elongated holes 36a, 36a of the plurality of lower support portions 36, 36 of the movable side member 5 and the circular holes of the connection portion 42 on the lower end side. That is, the lower end portion of the inner link 6 is rotatably connected to the movable member 5 via the connection member S with the connection member S as a rotation axis.
Further, the connecting member S provided in the connecting portion 42 on the lower end side of the inner link 6 extends in the vertical direction along the elongated holes 36a, 36a formed in the plurality of lower supporting portions 36, 36. It can be moved. That is, the lower end portion of the inner link 6 is movable in the vertical direction along the lower support portions 36 and 36 in accordance with the back-and-forth movement of the movable side member 5.

  A plurality of ribs 43 are formed on the surface of the inner link 6. The plurality of ribs 43 are arranged so as to form a truss structure on the surface of the inner link 6. The plurality of ribs 43 can improve the rigidity of the inner link 6 and reduce the weight.

The outer link 7 of the present embodiment is formed to be wide in the left-right direction as a whole, and an insertion hole 51 through which the center portion and the lower end portion of the inner link 6 are inserted is formed in the center portion. ing.
The outer link 7 includes a plurality of connection portions 52 provided at upper and lower ends. The plurality of connecting portions 52 are connected to the upper support portions 35 and 35 of the front cover 30 and the lower support portions 26 and 26 of the fixed-side member 4, and are connected to the upper support portions 35 and 35 and the lower support portions 35 and 35. The part supported by the support parts 26 and 26 is pointed out. Further, a through hole (circular hole) into which the connection member S is inserted is formed in the connection portion 52 so as to penetrate the connection portion 52 in the left-right width direction.

The through holes formed in the connection portion 52 at the upper end portion are disposed on the extended lines of the insertion holes 35 a and 35 a formed in the plurality of support portions 35 and 35 on the upper side of the front cover 30. The connection member S is inserted into the circular holes of the upper support portions 35 and 35 and the circular holes of the connection portion 42 on the upper end side. That is, the upper end portion of the outer link 7 is rotatably connected to the front cover 30 via the connection member S with the connection member S as a rotation axis.
Note that the upper end portion of the outer link 7 has a notch portion 7a into which the protruding rib 38 of the front cover 30 is fitted. Therefore, the connection portion 52 at the upper end portion of the outer link 7 sandwiches the notch portion 7a. Two are provided.
Further, the connecting member S and the protruding rib 38 are set so as not to interfere with each other in the cutout portion 7a. That is, the projecting dimension of the projecting rib 38 is set so as not to contact the connecting member S.

Further, a through hole (circular hole) is similarly formed in the connecting portion 52 on the lower end side of the outer link 7.
A connection member S is inserted into the elongated holes 26a, 26a of the plurality of lower support portions 26, 26 of the fixed side member 4 and the circular holes of the connection portion 52 on the lower end side. That is, the lower end portion of the outer link 7 is rotatably connected to the stationary member 4 via the connection member S with the connection member S as a rotation axis.
In addition, the connecting member S provided in the connecting portion 52 on the lower end side of the outer link 7 extends vertically along the long holes 26a and 26a formed in the plurality of lower supporting portions 26 and 26. It can be moved. That is, the lower end portion of the outer link 7 is movable in the vertical direction along the lower support portions 26 and 26 according to the back-and-forth movement of the movable side member 5.

  A plurality of ribs 53 are formed on the surface of the outer link 7. The plurality of ribs 53 are arranged so as to form a truss structure on the surface of the outer link 7. The plurality of ribs 53 can improve the rigidity of the outer link 7 and reduce the weight.

The connection member S used in the X link mechanism as described above is a metal shaft as described above, and the inner link 6 and the outer link 7 are connected to the fixed side member 4 and the movable side member 5. The front cover 30 is rotatably connected.
Further, each of the plurality of connection members S is set to be assembled with respect to the front side cover 30 of the fixed side member 4 and the movable side member 5 from the side opposite to the side where the operation unit 9 is provided. Has been.
Furthermore, as shown in FIG. 11, a retaining portion 29 for the connection member S may be provided in the vicinity of the support portion 25 and the like. The retaining portion 29 is a protrusion having a vertical portion 29a and an inclined portion 29b, and its tip has elasticity. When the connection member S is inserted into the insertion hole 25a of the support portion 25, the connection member S is inserted from the through hole 30f, and the end opposite to the insertion direction exceeds the tip of the retaining portion 29. Until it is inserted into the insertion hole 25a. Since the retaining portion 29 has elasticity, it elastically deforms when the connecting member S is inserted, and elastically recovers when the opposite end exceeds the distal end of the retaining portion 29.

  By adopting the configuration as described above, the movable side member 5 is moved in a direction away from the fixed side member 4 and in a direction back to the rear side via the X link mechanism which is a movable mechanism. be able to.

  Next, the front / rear lock mechanism and the vertical lock mechanism will be described in more detail.

(Front / rear locking mechanism)
The front / rear locking mechanism includes a plurality of engaged portions 10, a lock member 11 engaged with the plurality of engaged portions 10, and biases the lock member 11 toward the plurality of engaged portions 10. An urging member 12 and a rotation operation member 13 for operating the lock member 11 while being rotatably held by the movable side member 5 are provided.

The plurality of engaged portions 10 are made of metal, and are disposed along the front-rear direction and sandwiched between the front cover 30 and the rear cover 31 as shown in FIGS. .
Further, as described above, the plurality of engaged portions 10 are arranged on the outer side in the width direction than the left and right headrest pillars 2 and 2, respectively.

The engaged portion 10 has a ratchet structure having a plurality of teeth 60a ... arranged in parallel in the front-rear direction, and the plurality of teeth 60a ... are formed to project upward from below.
The engaged portion 10 includes a first protruding portion 60, a second protruding portion 61, a gap 62, and a proximal end portion 63.
The base end portion 63 is stored in the base end storage portion 30 d of the front cover 30. The first protruding portion 60 protrudes from the lower end portion of the base end portion 63 toward the rear cover 31. The second protrusion 61 protrudes toward the rear cover 31 from a position close to the center of the base end 63.

The first protrusion 60 is formed with the plurality of teeth 60 a for forming the engaged portion 10 in a ratchet structure so as to protrude obliquely upward from the upper end edge of the first protrusion 60.
The second protrusion 61 is parallel to the first protrusion 60 and is spaced from the upper ends of the plurality of teeth 60a. The gap 62 is defined between the second protrusion 61 and the plurality of teeth 60 a of the first protrusion 60.
Note that the leading end portions of the first projecting portion 60 and the second projecting portion 61 are accommodated in the leading end accommodating portion 31 d of the rear cover 31.
The engaged portions 10 and 10 allow the first protrusion 60 to be inserted into the through hole 23 a of the mounting portion 23 and the second protrusion 61 to be inserted to the through hole 23 b of the mounting portion 23. Therefore, the left and right headrest pillars 2 and 2 are arranged outside in the width direction. The first projecting portion 60 and the second projecting portion 61 are moved in the front-rear direction in the through holes 23 a and 23 b in accordance with the front-rear movement of the movable member 5.

  The lock member 11 is engaged with the engaged portion 10 and constitutes a main part of the front / rear locking mechanism together with the engaged portion 10, as shown in FIGS. A held portion 70, engaging portions 71 and 71, and connecting portions 72 and 72 are provided.

The held portion 70 is a metal shaft, is held by the fixed-side member 4 and is formed long along the width direction of the fixed-side member 4. As shown in the above, tips of the plurality of holding portions 21 and 21 and the central holding portion 21a disposed behind the fixed side member 4 and provided on the rear surface of the fixed side member 4, The movement restricting portions 21b and 21b are mounted so as to be inserted from a portion having a space between them.
The held portion 70 is disposed in the gap 62 between the first protruding portion 60 and the second protruding portion 61. The held portion 70 is disposed above the engaging portions 71 and 71.

The engaging portions 71 and 71 are metal shafts and engage with the plurality of engaged portions 10 and 10, respectively, to lock the movement of the movable member 5.
More specifically, the engaging portions 71 and 71 are arranged in parallel with the held portion 70, rotate around the held portion 70, and are biased toward the plurality of teeth 60a. Engaging. Further, the engaging portions 71 and 71 are disposed in front of the fixed side member 4.
Further, the engaging portions 71 and 71 are arranged at positions to be engaged with the plurality of teeth 60 a... By being urged by the urging member 12, and a direction of urging by the urging member 12. When the actuator moves in the opposite direction, it can be moved to the position of the gap 62. Thus, when the engaging parts 71 and 71 move to the position of the gap 62, the lock is released.
Further, among the engaging portions 71, 71, the end portions (tip portions) on the side of the plurality of teeth 60a ... project inward from the engaged portions 10, 10, as shown in FIG. However, the protrusion length is set so as not to reach the X link mechanism.

The connecting portions 72, 72 are metal shafts, and connect both ends of the held portion 70 and the respective end portions of the plurality of engaging portions 71, 71. 4 on both the left and right sides.
That is, the lock member 11 is disposed in the vicinity of the fixed side member 4 and is formed in a substantially C shape so as to surround the fixed side member 4. The held portion 70, the engaging portions 71 and 71, and the connecting portions 72 and 72 are integrally formed. Further, the portion between the held portion 70 and the connecting portions 72 and 72 and the portion between the held portion 70 and the engaging portions 71 and 71 are rounded.

  Further, as shown in FIG. 8, a buffer member 73 made of resin is provided between the lock member 11 and the fixed side member 4. That is, of the connecting portions 72, 72, one connecting portion 72 on the side where the rotation operation member 13 is disposed includes the one connecting portion 72, the held portion 70, and the engaging portion 71. The buffer member 73 is attached so as to cover the end portion on the one connecting portion 72 side. In other words, the one connecting portion 72 includes the buffer member 73.

As shown in FIG. 8, the buffer member 73 is attached to the lock member 11 from the fixed side member 4 side toward the outside.
That is, the buffer member 73 includes an insertion hole 73a into which the one engaging portion 71 is inserted, a groove portion 73b into which the connecting portion 72 on the buffer member 73 side is fitted, and a covering wall 73c that covers the connecting portion 72. Have.
The groove portion 73b is formed so as to fit the end portion on the connecting portion 72 side of the held portion 70 from the connecting portion 72. The insertion hole 73a is formed so as to penetrate the bottom of the groove 73b.
In order to attach the buffer member 73 having such a shape to the lock member 11, the one engaging portion 71 is inserted into the insertion hole 73 a while the groove portion 73 b is connected to the connecting portion 72 side of the held portion 70. Fit the end. Thereafter, the buffer member 73 is moved in the direction of the arrow in FIG. 8, and finally the connecting portion 72 is fitted into the groove 73b.

The buffer member 73 is configured to increase the contact area between the lock member 11 and the rotation operation member 13.
That is, since the buffer member 73 is provided so as to cover the entire connecting portion 72 of the lock member 11, it is thicker than the diameter of the connecting portion 72.
Further, both the lock member 11 and the rotation operation member 13 are components that rotate. Therefore, if the buffer member 73 is not attached to the lock member 11, the lock operation member 13 is operated to be brought into contact with the lock member 11 and further rotated. Since the 11 rounded part escapes, the operation efficiency of the lock member 11 may be impaired. In order to solve such a problem, the buffer member 73 is attached to the lock member 11 to increase the contact area between the lock member 11 and the rotation operation member 13. Thereby, it can suppress that the operating efficiency of the said lock member 11 by the said rotation operation member 13 is impaired.
Furthermore, the buffer member 73 is set so that the buffer member 73 contacts the fixed side member 4 when the lock member 11 moves toward the fixed side member 4. As a result, while the movement range of the lock member 11 is restricted by the buffer member 73, it is possible to prevent the lock member 11 from coming into direct contact with the fixed-side member 4 and to suppress the generation of abnormal noise.

The urging member 12 urges the engaging portions 71, 71 of the lock member 11 toward the engaged portion 10 side (the plurality of teeth 60a ... side). In the present embodiment, a plurality of coil springs housed in the plurality of housing portions 24, 24 are employed.
Note that the hook portion 12 a that is hooked on the engaging portion 71 of the biasing member 12 is hooked on the engaging portion 71 from above.

The rotation operation member 13 is made of metal and is rotatably held by the movable member 5 and operates the engagement portion 71 of the lock member 11. Also, as shown in FIGS. 5, 6, and 9, the holding portion 33 holds the front cover 30 and the rear cover 31.
The rotation operation member 13 moves the engagement portion 71 in a direction opposite to the urging direction of the urging member 12 when the engagement portion 71 of the lock member 11 is operated. The engaging portion 10 can be rotated in a direction to release the engaged state with the plurality of teeth 60a. The rotation operation member 13 is provided in a direction in which the engaging portion 71 of the lock member 11 is urged by the urging member 12. Further, the rotation operation member 13 is disposed so as to be inclined so as to gradually fall from the rear toward the front. That is, the holding portion 33 itself is arranged so as to be inclined so that the rotation operation member 13 can be inclined.
The rotation operation member 13 includes a first operation unit 80, a second operation unit 81, a rotation shaft unit 82 serving as a rotation shaft, and an urging member 83. The first operation unit 80 and the second operation unit 81 are integrally formed.

  The first operating portion 80 is for operating the front / rear locking mechanism, and is a plate-like portion that is located below the connecting portion 72 of the locking member 11 and abuts against the buffer member 73 from below. is there. The front end of the first operating portion 80 in the protruding direction is disposed below the rotating shaft portion 82. Therefore, the buffer member 73 can be moved upward by rotating the first operation part 80 about the rotation shaft part 82 as an axis.

The second operation portion 81 is for operating the up-and-down lock mechanism. The second operation portion 81 is directed downward from the end portion on the fixed side member 4 side of the first operation portion 80 and toward the operation portion 9 side. Are integrally formed so as to protrude obliquely. The distal end of the second operation portion 81 in the projecting direction is disposed below the upper and lower lock member 14, and the vicinity of the center of the second operation portion 81 in the projecting direction is disposed at substantially the same height as the upper and lower lock member 14. Yes.
Further, the side surface of the fixed side member 4 of the second operation portion 81 is separated from the vertical lock member 14 when the vertical lock mechanism is locked, and is in contact with the vertical lock member 14 when the lock is released.
If the second operation portion 81 is rotated upward with the rotation shaft portion 82 as an axis, the upper and lower lock member 14 can be operated to be pushed into the fixed side member 4 side.

The rotation shaft portion 82 is provided at the end of the first operation portion 80 on the operation portion 9 side, and functions as a rotation shaft that rotates the entire rotation operation member 13.
The rotation shaft portion 82 includes a shaft main body 82a made of a metal shaft, and a shaft holding unit that integrally holds the shaft main body 82a and the end of the first operation unit 80 on the operation unit 9 side. Part 82b.
The shaft main body 82a is held above the first operating portion 80 by the shaft holding portion 82b. The shaft holding portion 82b is formed in a U shape with a plurality of protruding portions 82c and 82c protruding upward, and the shaft main body 82a is inserted through the plurality of protruding portions 82c and 82c. An insertion hole is formed.
In addition, both end portions of the shaft main body 82a that protrude outward (front side and rear side) of the plurality of protruding portions 82c and 82c are holes formed in the insertion holding portions 33a and 33a of the holding portion 33. Inserted and held.

The urging member 83 is a coil spring, and is provided between the plurality of protrusions 82c and 82c in a state where the shaft main body 82a is inserted.
One end of the biasing member 83 that is a coil spring is disposed so as to abut on the upper surface of the first operation unit 80, and the other end thereof abuts on the inner surface of the front cover 30 or the rear cover 31. Is arranged. That is, when the rotation operation member 13 is operated so as to rotate the first operation unit 80 upward, one end and the other end of the biasing member 83 approach each other. Therefore, when the operation of the rotation operation member 13 is stopped, the first operation portion 80 returns to the original position by the elastic return force of the biasing member 83.

  By adopting the configuration as described above, the movement of the movable side member 5 in the front-rear direction with respect to the fixed side member 4 is engaged with a plurality of positions, that is, the engagement portion 71 engages with the plurality of teeth 60a. Can be locked and unlocked in position.

(Up / down lock mechanism)
The vertical lock mechanism is provided for the left and right headrest pillars 2, 2, and locks and locks the fixed side member 4 at a plurality of vertical positions with respect to the left and right headrest pillars 2, 2. It is a thing to cancel.
The vertical lock mechanism includes a plurality of notches 15 formed in at least one of the left and right headrest pillars 2, 2, the left and right pillar holding portions 4 a and 4 b, the vertical lock member 14, and the rotation And an operation member 13.

The plurality of cutouts 15 may be formed in the headrest pillar 2 on the side where at least the upper and lower lock members 14 are provided among the left and right headrest pillars 2 and 2. However, since the plurality of cutouts 15 are used in the structure for preventing the headrest pillars 2 and 2 from being pulled out by the lock portions 3d and 3d of the left and right holder portions 3 and 3, the left and right headrest pillars 2 are used in the present embodiment. , 2 are formed with the plurality of notches 15.
The plurality of notches 15 are formed in a multistage shape along the length direction of the left and right headrest pillars 2 and 2 as shown in FIGS. Further, the plurality of notches 15 are formed on the outer peripheral surface near the center of the left and right headrest pillars 2 and 2.

The left and right pillar holding portions 4a and 4b hold the left and right headrest pillars 2 and 2 as described above, whereby the fixed-side member 4 is moved to the left and right headrest pillars 2 and 2, respectively. It is possible to move up and down along.
The vertical movement range of the fixed side member 4 is based on a range in which the pillar retaining portions 2a and 2a provided on the left and right headrest pillars 2 and 2 can slide along the slits 20a and 20a.

The upper and lower lock member 14 is held by the lock holding portion 27 on the side where the rotation operation member 13 is provided among the lock holding portions 27 and 27 formed in the left and right pillar holding portions 4a and 4b.
The upper and lower lock members 14 include an engaging portion (not shown) that engages with the notch 15 in the lock holding portion 27 and a direction in which the engaging portion is engaged with the notch 15. A biasing member (not shown) for biasing.
Therefore, if the vertical lock member 14 is operated so as to be pushed into the back side of the lock holding portion 27, the engaging portion (not shown) is separated from the notch 15, and the vertical lock member 14 is not operated unless the vertical lock member 14 is operated. The engaging portion is engaged with the notch 15.

The rotation operation member 13 includes the second operation portion 81 for operating the vertical lock member 14 as described above.
In addition, the first operation unit 80 and the second operation unit 81 are rotated in conjunction with each other, and the second operation unit 81 is operated simultaneously with the unlocking operation of the front-rear locking mechanism by the first operation unit 80. The unlocking operation by the vertical lock mechanism can be performed.

Further, the length in the front-rear direction of the rotation operation member 13 is set to a length corresponding to the moving distance of the movable side member 5. That is, a part of the buffer member 73 comes into contact with any part in the length direction of the first operation unit 80. Further, the button 9 is in contact with any part in the length direction of the second operation portion 81, and any part is in contact with the vertical lock member 14. Further, the rotating shaft portion 82 is held by the holding portion 33 over the length direction thereof.
Further, since the button 9 comes into contact with any part in the length direction of the second operation portion 81, the positional relationship between the rotation operation member 13 and the button 9 is determined by the back-and-forth movement of the movable side member 5. The position of the front cover 30 and the rear cover 31 that are the movable member 5 and the button 9 is not changed.

  By adopting the configuration as described above, the fixed side member 4 is locked at a plurality of positions in the vertical direction with respect to the left and right headrest pillars 2, 2, that is, at a position where the plurality of notches 15 are formed. And can be unlocked.

The button 9 that is the operation unit 9 is attached to the button attachment unit 34 provided on the side surfaces of the front cover 30 and the rear cover 31 as described above, and is in contact with the rotation operation member 13. Touch. And the said rotation operation member 13 can be operated now by being pushed in to the internal hollow part side of the said case body.
The button 9 includes a button main body 90 and a cylindrical portion 91.
The button main body 90 can be moved forward and backward along the tubular portion 91 in a state of being inserted into the tubular portion 91. The tubular portion 91 is attached to the button attachment portion 34. The button main body 90 is in contact with the lower end portion (tip in the protruding direction) of the second operation portion 81 of the rotation operation member 13. Further, the button main body 90 can be moved forward and backward along the cylindrical portion 91 so as not to interfere with the restricting portion 33 b of the holding portion 33.

  By adopting the configuration as described above, the rotation operation member 13 can be rotated upward about the rotation shaft portion 82, and accordingly, the first operation portion 80 can lock the lock operation member 13. The member 11 can be operated, and the upper and lower lock member 14 can be operated by the second operation portion 81.

(Description of skin material)
A case body comprising the front cover 30 and the rear cover 31 is shown in FIG.
As shown in FIG. 4, it is covered with the skin material 110.
A trim plate 112 is sewn at the end of the skin material 110 along the end.
In addition, a groove 39 is formed on the lower surface of the case body (particularly, the front cover 30 in the present embodiment) for embedding the end of the skin material 110. The groove 39 is disposed at a position facing the guide contact portion 37 (37a).
Further, protrusions 39a and 39a projecting inward are integrally formed at the end of the groove 39 near the opening.
When the case body is covered with the skin material 110, the trim body 112 is inserted into the groove 39 after the cover body 110 is entirely covered with the skin material 110, and the trim plate 112 of the end of the skin material 110 is inserted into the groove 39. It hooks on the part 39a, 39a. Thereafter, the bottom edge covers 32 and 32 are fitted into two elongated holes formed on the lower surface of the case body, respectively, so that the skin material 110 is also sandwiched by the bottom edge covers 32 and 32.
A cushion pad 100 is provided on the back side of the skin material 110 and between the skin material 110 and the case body.

(Headrest operation)
Next, the operation of the headrest 1 configured as described above will be described.
The operation of the headrest 1 includes an operation in which the front cover 30 of the movable side member 5 moves in a direction away from the fixed side member 4 in the forward direction and a direction returning from the forwardly separated state to the rear side. Including. Further, the stationary side member 4 including the left and right pillar holding portions 4a and 4b includes an operation of moving in the vertical direction along the left and right headrest pillars 2 and 2.

First, the operation of the movable member 5 will be described.
FIG. 15 shows a state in which the movable member 5 (front cover 30) is approaching the fixed member 4. That is, it has returned to the rear. When the button 9 is not operated, the engaging portion 71 is engaged with the teeth 60a of the engaged portion 10, and the movement of the movable side member 5 in the front-rear direction is locked. .

To move the movable side member 5 forward from the fixed side member 4 from this state, first, the rotary operation member 13 is rotated to the X link mechanism side by pushing the button 9. Along with this, the first operating portion 80 is rotated upward to push up the engaging portion 71 provided with the buffer member 73 upward.
As a result, the engaging portion 71 is separated from the tooth 60a of the engaged portion 10, so that the locking of the movable member 5 in the front-rear direction by the lock member 11 can be released.

The movable side member 5 is moved in a direction away from the fixed side member 4 while maintaining the state in which the engaging portion 71 is pushed upward.
At this time, the engaged portion 10 moves forward as the inner link 6 and the outer link 7 rotate. At this time, the connection member S of the inner link 6 and the connection member S of the outer link 7 move upward along the long holes 26a and the long holes 36a of the plurality of support portions 26 and 36 below. Go.

  If the operation of the button 9 is stopped at an arbitrary position, the engaging portion 71 is urged toward the plurality of teeth 60a... According to the urging force of the urging member 12, and returns to the original position. It meshes with one of the plurality of teeth 60a. As a result, as shown in FIG. 16, the movable side member 5 can be moved in a direction away from the fixed side member 4 forward, and can be locked at a desired position.

  At this time, the engaging portion 71 may contact the vicinity of the protruding end of the tooth 60a without entering the valley between the adjacent teeth 60a and 60a. In this case, if the movable side member 5 is moved either forward or backward in a state where the button 9 is not operated, the engaging portion 71 enters the nearest valley, and the movable side member 5 Can be locked.

Similarly, when the movable side member 5 is returned to the rear side, first, the button 9 is pushed, the buffer member 73 is operated, and the lock by the engaging portion 71 is released.
Thereafter, the movable side member 5 is returned to the rear, and the operation of the button 9 may be stopped at an arbitrary position. At this time, the X link mechanism and the like move in the opposite direction to the case where the movable member 5 is moved forward.
As described above, the movable side member 5 is moved in the front-rear direction, and the stepwise position adjustment according to the arrangement of the plurality of teeth 60a of the engaged portion 10 is possible. That is, the position adjustment of the headrest 1 in the front-rear direction can be performed in stages.

Next, the vertical movement of the fixed member 4 including the left and right pillar holding portions 4a and 4b will be described.
The left and right pillar holding portions 4 a and 4 b are in a state where the state shown in FIG. 15 is located below the left and right headrest pillars 2 and 2. When the button 9 is not operated, the engaging portion of the upper and lower lock member 14 is engaged with one notch 15 on the lower side of the headrest pillar 2, and the left and right pillar holding portions 4a, The movement of 4b in the vertical direction is locked.

In order to move the left and right pillar holding portions 4a and 4b upward along the left and right headrest pillars 2 and 2 from this state, first, by pushing the button 9, the rotating operation member 13 is moved to the X link. Rotate to the mechanism side. Along with this, the second operating portion 81 is rotated to the X link mechanism side, the upper and lower lock members 14 are pushed into the back side of the lock holding portion 27, and the engagement portion (not shown) is locked. It moves to the back side of the holding part 27.
As a result, the engaging portion of the vertical lock member 14 is separated from the notch 15 of the headrest pillar 2, so that the left and right pillar holding portions 4 a and 4 b are vertically moved by the engaging portion of the vertical lock member 14. The movement lock can be released.

And while maintaining the state which moved the said engaging part of the said up-and-down lock member 14 to the back | inner side of the said lock holding | maintenance part 27, the said right-and-left pillar holding | maintenance parts 4a and 4b extend, and the fixed side member 4 It moves upward along the left and right headrest pillars 2 and 2.
At this time, the movable side member 5, the X link mechanism, and the like move upward as the fixed side member 4 moves.

  If the operation of the button 9 is stopped at an arbitrary position, the engaging portion of the upper and lower lock member 14 returns to the original position by the urging force of the urging member (not shown), and the upper side of the headrest pillar 2 Will be engaged with one notch 15. As a result, as shown in FIG. 16, the left and right pillar holding portions 4a and 4b can be moved upward along the left and right headrest pillars 2 and 2 to be locked at a desired position.

  At this time, the engaging portion of the upper and lower lock member 14 may come into contact with the outer peripheral surface of the headrest pillar 2 located between the notches 15 and 15 adjacent in the vertical direction. In this case, if the left and right pillar holding portions 4a and 4b are moved either up or down without operating the button 9, the engaging portion will be engaged with the nearest notch 15. The left and right pillar holding portions 4a and 4b can be locked.

Similarly, when the left and right pillar holding portions 4a and 4b are moved downward, the button 9 is first pushed to operate the second operation portion 81, and the lock by the engaging portion of the upper and lower lock member 14 is released. To do.
Thereafter, the left and right pillar holding portions 4a, 4b and the fixed side member 4 may be moved downward to stop the operation of the button 9 at an arbitrary position. At this time, the movable member 5, the X link mechanism, and the like also move downward as the left and right pillar holding portions 4a and 4b move.
As described above, the left and right pillar holding portions 4a and 4b are moved in the vertical direction, and the stepwise position adjustment according to the plurality of notches 15 of the headrest pillar 2 is possible. That is, the vertical position adjustment of the headrest 1 can be performed in stages.

  According to this embodiment, the movable side member 5 can be locked and unlocked in the front-rear direction on the outer side in the width direction than the left and right headrest pillars 2 and 2. Thereby, the stability in the engaged state of the plurality of engaged portions 10 and 10 and the lock member 11 can be improved.

Further, the movable member 5 that moves in the front-rear direction is constituted by the front cover 30 and the rear cover 31, and the plurality of engaged portions 10 are sandwiched by the front cover 30 and the rear cover 31. Since it can do, the support rigidity of the said to-be-engaged part 10 and 10 can be improved.
Therefore, it is possible to suitably respond to the desire to improve the support rigidity of the plurality of engaged portions 10, 10.

Further, when the lock member 11 moves toward the fixed side member 4, the buffer member 73 abuts on the fixed side member 4, so that the movement range of the lock member 11 is regulated by the buffer member 73. On the other hand, the lock member 11 can be prevented from coming into direct contact with the fixed side member 4 to suppress the generation of abnormal noise.
Therefore, it is possible to suitably respond to a request to suppress the occurrence of abnormal noise while restricting the movement range of the lock member 11.

Further, since the buffer member 73 is attached to the lock member 11 provided so as to surround the fixed side member 4 from the fixed side member 4 side toward the outside, the buffer member 73 is provided. The fixed-side member 4 is present in the direction of removing the lock member 11 from the lock member 11. Therefore, the buffer member 73 can be prevented from being detached from the lock member 11 in a state where the lock member 11 is provided on the fixed side member 4.
Accordingly, it is possible to suitably cope with a request for suppressing the buffer member 73 from being detached from the lock member 11 in a state where the lock member 11 is provided on the fixed side member 4.

Further, since the buffer member 73 is configured to increase the contact area between the lock member 11 and the rotation operation member 13, the operation efficiency of the lock member 11 by the rotation operation member 13 is increased. Can be improved.
Therefore, it is possible to appropriately respond to the desire to improve the operation efficiency of the lock member 11 by the rotation operation member 13.

Further, since the pillar retaining portions 2a, 2a can be arranged in the front-rear direction, the pillar retaining portions 2a, 2a do not hinder the operation of the front-rear locking mechanism outside the left and right headrest pillars 2, 2. However, it can suppress that the said fixed side member 4 remove | deviates from the said right-and-left headrest pillars 2 and 2. FIG.
Therefore, it is possible to suitably cope with a request for suppressing the separation of the fixed side member 4 from the left and right headrest pillars 2 and 2 while preventing the operation of the front and rear lock mechanism.

Further, the urging member 12 can be easily accommodated in the accommodating portion 24 from the front side of the fixed side member 4, and the urging member 12 can be prevented from coming out of the accommodating portion 24 by the retaining portion 24a. .
Therefore, the urging member 12 can be easily accommodated, and it is possible to suitably cope with a request for suppressing the urging member 12 from coming out of the accommodating portion 24.

In addition, the lock member 11 can be held by the holding portion 21 in the vicinity of the front-rear lock mechanism. Accordingly, the lock member 11 can be engaged with the engaged portions 10 and 10 while suppressing deformation of the lock member 11.
Therefore, it is possible to suitably respond to a request for engaging the lock member 11 with the engaged portions 10 and 10 while suppressing deformation of the lock member 11.

Further, the movement restricting portion 21b can restrict the lock member 11 from moving in the direction opposite to the mounting direction.
Therefore, the movement restricting portion 21b can appropriately respond to a request to restrict the movement of the lock member 11 in the direction opposite to the mounting direction.

DESCRIPTION OF SYMBOLS 1 Headrest 2 Headrest pillar 4 Fixed side member 4a, 4b Pillar holding | maintenance part 4c Rear surface connection part 4d, 4e Connection part 5 Movable side member 6 1st link (inner link)
7 Second link (outer link)
8 Cross connection part 9 Operation part (button)
10 engaged portion 11 lock member 12 urging member (coil spring)
13 Rotating operation member 14 Vertical lock member 15 Notch 20 Pillar insertion hole 21 Holding part 22 Recessed part 23 Mounting part 23a, 23b Through hole 24 Storage part 24a Retaining part 25 Support part 25a Insertion hole 26 Support part 26a Hole part 26b Through Hole 27 Lock holding portion 28 Projection rib 30 Front cover 30b Peripheral side surface portion 30d Base end storage portion 31 Rear cover 31b Peripheral side surface portion 31d Tip storage portion 33 Holding portion 35 Support portion 35a Insertion hole 36 Support portion 36a Hole portion 36b Through hole 42 connecting portion 52 connecting portion 60 first protruding portion 60a plural teeth 61 second protruding portion 62 gap 63 base end portion 70 held portion 71 engaging portion 72 connecting portion 73 buffer member 80 first operating portion 81 second operating portion 82 Rotating shaft 83 Biasing member 110 Skin material 112 Trim plate

Claims (7)

Left and right headrest pillars separated from each other;
A stationary member provided on the headrest pillar;
A movable side member connected to the fixed side member via a movable mechanism, and movable in the front-rear direction with respect to the fixed side member;
A front-rear locking mechanism that locks and unlocks the movement of the movable-side member in the front-rear direction with respect to the fixed-side member,
The front and rear locking mechanism is
A plurality of engaged portions respectively arranged on the outer side in the width direction than the left and right headrest pillars;
A locking member having a plurality of engaging portions that respectively engage with the plurality of engaged portions and lock the movement of the movable side member ,
The lock member is made of metal and is disposed close to the fixed side member,
A buffer member is provided between the lock member and the fixed side member,
When the lock member moves toward the fixed side member, the buffer member is in contact with the fixed side member,
The locking member is
A held portion that is held by the fixed side member and is formed elongated along the width direction of the fixed side member;
The plurality of engaging portions arranged in parallel with the held portion and engaged with the engaged portion;
A plurality of connecting portions that connect both ends of the held portion and the respective ends of the plurality of engaging portions;
And it is provided in the fixed side member so as to surround the periphery of the fixed side member,
The buffer member, relative to said locking member, the headrest characterized that you have installed outwardly from the stationary member side. The movable side member has a front cover and a rear cover configured as an internal hollow case body by being combined with each other,
In the internal hollow part composed of the front cover and the rear cover, at least upper ends of the left and right headrest pillars, the fixed side member, the movable mechanism, and the front / rear lock mechanism are housed.
The headrest according to claim 1, wherein the plurality of engaged portions are disposed along the front-rear direction and are sandwiched between the front cover and the rear cover. The front-rear lock mechanism includes a rotation operation member that is rotatably held by the movable member and that operates the lock member.
The headrest according to claim 1 , wherein the buffer member is configured to increase a contact area between the lock member and the rotation operation member . The fixed side member is
Pillar insertion holes that are formed at both ends in the width direction of the fixed side member, and that allow the left and right headrest pillars to be inserted vertically
A slit formed along the vertical direction in at least one of the front surface and the rear surface of the fixed side member, and communicated with the pillar insertion hole,
The left and right headrest pillar of claim 1 to 3, characterized in that the headrest pillar has said pillar stopper portion provided slidably with respect to the slit in a state which is inserted into the pillar insertion hole The headrest as described in any one . The front-rear lock mechanism includes a biasing member that biases the plurality of engaging portions toward the engaged portion .
The fixed side member is
An accommodating portion for opening the front side of the stationary member and accommodating the biasing member;
The headrest according to any one of claims 1 to 4 , further comprising a retaining portion that regulates forward movement of the biasing member accommodated in the accommodating portion . The fixed side member is provided on the rear surface of the fixed side member, and has a holding portion that holds the lock member ,
The holding portion, the headrest according to any one of claims 1 to 5, characterized in that disposed behind the at least the left and right headrest pillar. The fixed side member is provided on a rear surface of the fixed side member, and the lock member moves in a direction opposite to the mounting direction by contacting the lock member along a direction in which the lock member is mounted on the holding portion. The headrest according to claim 6 , further comprising a movement restricting portion that restricts the movement .

Images