JP6335630B2 - 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).
By the way, in the headrest that enables position adjustment in the front-rear direction, a metal shaft inserted in the axial direction is used as a rotation shaft of a link mechanism for moving the headrest back and forth, or guides the headrest forward and backward movement. It may be used as a guide shaft member.
For example, in the headrest described in Patent Document 1, the links constituting the two sets of left and right X-shaped links are rotatably connected by a link shaft (hereinafter referred to as a shaft), thereby adjusting the position in the front-rear direction. ing.

JP 2006-027593 A

For the headrest that enables the position adjustment in the front-rear direction, means for suppressing the movement of the shaft in the axial direction may be used.
By the way, although the headrest that can adjust the position in the front-rear direction may be provided with means for suppressing the movement of the shaft in the axial direction as described above, the vibration of the seat itself or the vibration accompanying the front-rear movement of the headrest. For example, there is a constant concern that the shaft moves in the axial direction. In particular, in the case of a headrest having a plurality of links as described in Patent Document 1, since the operation of each link is not simple, the movement of the shaft in the axial direction is more effectively suppressed, and each link is stabilized. It was desired to be able to support it.

  The subject of this invention is making it possible to suppress more effectively the movement to the axial direction of a shaft in a headrest provided with a some link.

In order to solve the above-described problems, the invention according to claim 1 is a headrest, and a fixed-side member provided on the headrest pillar;
A movable side member whose position can be adjusted in the front-rear direction with respect to the fixed side member;
A link mechanism having a plurality of links connecting the fixed side member and the movable side member, and
The fixed side member and the movable side member have a plurality of support parts that rotatably support the plurality of links via a shaft,
The shaft is inserted into through holes formed in the links and the support portions adjacent to each other in the width direction among the plurality of links and the plurality of support portions,
At least one of the fixed side member and the movable side member is provided with movement restriction means for restricting movement of the shaft in the axial direction ,
The movement restricting means (first movement restricting means 100) provided on the movable side member is located on the insertion side of the shaft,
The movement restriction means is
A guide portion for guiding the shaft to the through hole when the shaft is inserted into the through hole;
And a restricting portion that is integrally formed on the support portion side of the guide portion and restricts movement of the shaft in the axial direction after being inserted into the through hole .

The invention according to claim 2 is the headrest according to claim 1, wherein the guide portion has elasticity, is deformed when the shaft is guided, and elastically returns after passing the shaft,
The position which opposes the said shaft among the said control parts is spaced apart and arrange | positioned from the said support part, It is characterized by the above-mentioned.

According to a third aspect of the present invention, in the headrest according to the first or second aspect, the guide portion is integrally formed with the movable side member at a position sandwiching the shaft among the movable side members, and of the shaft. It has the 1st and 2nd guide wall arrange | positioned facing a square shape so that a space | interval may become narrow gradually toward an insertion direction .

According to a fourth aspect of the present invention, in the headrest according to the third aspect , of the first guide wall and the second guide wall, each of the end portions on the support portion side protrudes toward the shaft side. Part is provided,
The projecting portion functions as a movement restricting portion that restricts movement of the shaft in the axial direction .

According to a fifth aspect of the present invention, in the headrest according to the third or fourth aspect, the first guide is located at a position avoiding the end on the support portion side of the first guide wall and the second guide wall. An escape portion is provided to avoid interference between the wall and the second guide wall and the stationary member .

A sixth aspect of the present invention is the headrest according to any one of the first to fifth aspects, wherein the fixed-side member is formed to penetrate at a position facing the support portion, for inserting the shaft. Has an insertion hole,
The movement restricting means (second movement restricting means 110) provided on the fixed side member is located on the insertion side of the shaft,
The movement restricting means includes a restricting protrusion that is formed to project from the peripheral portion of the insertion hole toward the through hole and restricts the movement of the shaft in the axial direction after being inserted into the through hole. It is characterized by that.

The invention described in claim 7 is the f Ddoresuto, a fixed-side member provided in the headrest pillar,
A movable side member whose position is adjustable in the front-rear direction with respect to the fixed side member;
A link mechanism having a plurality of links connecting the fixed side member and the movable side member, and
The fixed side member and the movable side member have a plurality of support parts that rotatably support the plurality of links via a shaft,
The shaft is inserted into through holes formed in the links and the support portions adjacent to each other in the width direction among the plurality of links and the plurality of support portions,
At least one of the fixed side member and the movable side member is provided with movement restriction means for restricting movement of the shaft in the axial direction,
The fixed side member is formed to penetrate at a position facing the support portion, and has an insertion hole for inserting the shaft.
The movement restricting means (second movement restricting means 110) provided on the fixed side member is located on the insertion side of the shaft,
The movement restricting means includes a restricting protrusion that is formed to project from the peripheral portion of the insertion hole toward the through hole and restricts the movement of the shaft in the axial direction after being inserted into the through hole. It is characterized by that.

  According to an eighth aspect of the present invention, in the headrest according to the seventh aspect, the regulating protrusion has elasticity, and the central portion of the shaft after the tip portion is inserted into the through hole. It arrange | positions so that it may oppose.

  According to a ninth aspect of the present invention, in the headrest according to the seventh or eighth aspect, an opening is formed at a position of the fixed side member that faces the restricting protrusion.

  According to the first aspect of the invention, in each of the fixed side member and the movable side member, the movement restricting means can effectively suppress the movement of the shaft in the axial direction. As a result, the first link and the second link can be stably supported by the plurality of support portions.

Moreover , since a shaft can be guided to a through-hole by a guide part, the assembly | attachment property to the support part of a shaft can be improved. Further, since the restricting portion is integrally formed on the support portion side of the guide portion, it is possible to restrict the movement of the shaft in the axial direction immediately after the shaft is inserted into the through hole.

According to the second aspect of the present invention, since the position of the restricting portion that faces the shaft is arranged away from the support portion, the guide portion that is integral with the restricting portion and has elasticity It becomes easy to deform when guiding the shaft. Accordingly, the shaft can be easily guided by the guide portion, and the movement of the shaft in the axial direction can be restricted by the restricting portion immediately after the shaft passes through the guide portion.

According to the third aspect of the present invention, the shaft can be easily guided toward the through hole only by moving the shaft along the first guide wall and the second guide wall. Further, since the guide portion is integrally formed with the movable side member at a position where the shaft is sandwiched among the movable side members, it is not necessary to prepare another member in order to form the guide portion, and the number of parts is reduced. be able to.

According to the fourth aspect of the present invention, each of the end portions on the support portion side of the first guide wall and the second guide wall is provided with the protruding portion that protrudes toward the shaft side. In some cases, the first guide wall and the second guide wall are more easily deformed when the shaft passes through the protruding portion. And since a protrusion functions as a movement control part which controls the movement to the axial direction of a shaft, the movement to the axial direction of a shaft can be further suppressed by the said protrusion.

According to the fifth aspect of the present invention, the interference between the first guide wall and the second guide wall and the fixed side member at a position avoiding the end portion on the support portion side of the first guide wall and the second guide wall. Since the escape part which avoids is provided, it can contribute to size reduction of a headrest, suppressing interference with a 1st guide wall and the 2nd guide wall, and a stationary-side member. In addition, since the first guide wall and the second guide wall other than the escape portion protrude, the first guide wall and the second guide wall are further deformed when the shaft passes through the protrusion. It becomes easy to do.

According to invention of Claim 6 and Claim 7, while being able to control the movement to the axial direction of the shaft after being inserted in the through-hole of the support part by the control projection, the fixed side member It is possible to suppress a decrease in rigidity of the peripheral portion of the side insertion hole.
According to the seventh aspect of the present invention, the movement of the fixed side member and the movable side member can be effectively suppressed by the movement restricting means. As a result, the first link and the second link can be stably supported by the plurality of support portions.

  According to the eighth aspect of the present invention, the restricting protrusion having elasticity is deformed when the shaft is inserted to facilitate insertion of the shaft, and is elastically restored after insertion into the through hole of the shaft, Movement in the axial direction can be restricted.

  According to the ninth aspect of the present invention, since the opening is formed at a position facing the restricting protrusion in the fixed member, the assembled state of the shaft can be confirmed from the opening.

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 inner side of a front side cover. It is a perspective view which shows the outer side of a front side cover. It is a partial expansion perspective view which shows a 1st movement control means. It is a figure explaining operation | movement of the 1st movement control means at the time of shaft insertion. It is a figure explaining the shape of a through-hole. It is a partial expansion perspective view which shows a 2nd movement control means. It is a perspective view which shows a part of stationary side member containing a 2nd movement control means. It is a figure explaining the opening part which functions as a confirmation window for 2nd movement control means. A 3rd movement control means is shown, (a) is the state before shaft insertion, (b) is the state at the time of shaft insertion. It is a side view which shows a 3rd movement control means. It is sectional drawing which shows the accommodation recessed part provided with the positioning part. It is a figure which shows a front side cover, a 1st link, a 2nd link, and an operation part. 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. It is a perspective view which shows notionally attaching a resin cover to a to-be-engaged part.

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 link mechanism (X link mechanism) that is a movable mechanism, a front / rear lock mechanism, a vertical lock mechanism, and an operation unit 9 are provided. The headrest 1 includes a cushion pad and a skin material 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 and 2 extend below the headrest 1 and are held by the left and right holder portions 3 and 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. Yes.

The left and right headrest pillars 2, 2 are held by the left and right holder parts 3, 3 and can be moved in the vertical direction along the left and right holder parts 3, 3.
Each of the left and right holder portions 3, 3 includes a cylindrical main body 3a that holds the left and right headrest pillars 2, 2, a cover body 3b that covers the cylindrical main body 3a, and a head that is provided at the upper end of the cylindrical main body 3a. Part 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, 2 to prevent the left and right headrest pillars 2, 2 from moving.

  The left and right headrest pillars 2 and 2 are provided with 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 stop part 2a, 2a. The pillar retaining portions 2a, 2a are arranged in the front-rear direction with respect to the headrest pillars 2, 2. It is possible to prevent the fixed-side member 4 from being detached 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. . Further, the pillar retaining portions 2a and 2a also function as so-called detents that prevent 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 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. In other words, the fixed side member 4 is provided for the left and right headrest pillars 2 and 2 provided in the seat back frame.
The fixed 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 (position adjustment is possible), and is connected to the fixed side member 4 via a 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 away from the fixed side member 4 and a direction returning backward. It 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 end portions of the left and right headrest pillars 2, 2, the fixed side member 4, the movable mechanism, and the front / rear lock mechanism are accommodated as internal mechanisms. .

The movable mechanism connects the fixed-side member 4 and the movable-side member 5. For example, a plurality of links 6 whose both ends in the width direction are rotatably supported with respect to the fixed-side member 4 and the movable-side member 5. , 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 pivotally connected to an intermediate portion that intersects each other.

  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 parts 10, 10 and the engaged parts 10, 10. The locking member 11 to be engaged, the urging member (not shown) that urges the engaging portions 71 and 71 (described later) of the locking member 11 to the engaged portions 10 and 10 side, and the movable side member 5 And a rotation operation member 13 for operating the lock member 11.

  The vertical lock mechanism locks and unlocks the fixed member 4 at a plurality of vertical positions with respect to the left and right headrest pillars 2 and 2. Moreover, this up-and-down lock mechanism has an up-down lock member mentioned later.

The operation unit 9 is exposed from the outer surface of the headrest 1 and simultaneously operates the front-rear locking mechanism and the vertical locking mechanism. More specifically, the movable side member 5 in a state in which the movement in the front-rear direction is locked is unlocked via the rotation operation member 13 and the fixed side in a state in which the movement in the vertical direction is locked. An operation for unlocking the 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.
In addition, the operation unit 9 of the present embodiment is a button 9 that can operate the front-rear locking mechanism and the up-down locking mechanism by being pushed into the inside of the headrest 1.

The fixed side member 4 and the X link mechanism (inner link 6 / outer link 7), the movable side member 5 and the X link mechanism, and the intermediate portions of the inner link 6 and the outer link 7 that intersect each other are connected by the shaft S. It is connected so that it can rotate. The shaft S is made of metal and formed in a straight line, and five shafts are used in the present embodiment.
The movable member 5 is provided with first movement restricting means 100 that restricts the movement of the shaft S used in the connection between the movable member 5 and the X link mechanism in the axial direction.
Further, the fixed side member 4 is provided with second movement restricting means 110 for restricting movement of the shaft S used for connection between the fixed side member 4 and the X link mechanism in the axial direction.
Further, on the side surface of the outer link 7 located on the outer side of the inner link 6 and the outer link 7, in the axial direction of the shaft S used to connect the intermediate portion of the inner link 6 and the intermediate portion of the outer link 7. The third movement restricting means 120 is provided for restricting the movement of.

Further, the upper and lower end portions of the inner link 6, the upper and lower end portions of the outer link 7, the plurality of support portions 25 and 25 of the fixed side member 4, and the plurality of support portions 35 and 35 of the movable side member 5 are formed. The through-holes 6b, 7b, 25c, 35b and the insertion holes 25d, 35c are not circular as shown in FIG. 6, but are irregular holes (holes). In these irregular holes (holes), shafts S having a round cross section set to a slightly larger diameter than the inner diameters of these holes (holes) can be inserted. It can be held firmly inside.
For convenience of explanation, in FIG. 6, the through hole 6 b of the inner link 6 is described as a representative, but it can be applied to the through hole 7 b of the outer link 7 and other through holes.

  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. 1, 8, 16 and the like, and includes a pair of left and right pillar holding portions 4a and 4b, a rear connection portion 4c, Part 4d, connecting part 4e, upper contact part 4f, a plurality of holding parts 21, 21, a plurality of mounting parts 23, 23, a plurality of accommodating parts 24, 24 and retaining parts 24a, 24a, A plurality of support portions 25, 26, a lock holding portion 27, and a protruding rib 28 are provided. 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 the left and right end portions of the fixed side member 4, and constitute the 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, thereby moving the fixed side member 4 in the vertical direction along the left and right headrest pillars 2 and 2. It is possible.
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 20 into which the left and right headrest pillars 2 and 2 are inserted. 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 and 20a are provided with pillar retaining portions 2a and 2a of the left and right headrest pillars 2 and 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 connection 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.
A plurality of holding portions 21 and 21 for holding a held portion 70 of the lock member 11 to be 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 for holding 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 are provided on the rear surface side of the rear surface connecting portion 4c. The movement restricting portion restricts the lock member 11 from moving in the direction opposite to the attaching direction by contacting the lock member 11 along the direction in which the holding member 21 or 21 is attached. It is formed in a convex shape so as to protrude rearward.
Further, the plurality of movement restricting portions are respectively disposed between the plurality of holding portions 21 and 21 and the central holding portion 21a.
When viewed from the side, there is a space 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, and the lock member 11 is covered from the gaps. The holding part 70 can be attached.

  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. Further, 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.

  The upper contact portion 4f is provided on both the left pillar holding portion 4a side and the right pillar holding portion 4b side of the connecting portion 4d provided between the upper ends of the left and right pillar holding portions 4a and 4b. Yes. The upper abutting portions 4f and 4f are respectively abutted against upper rail portions 37b and 37b (described later) provided on the movable member 5 side, projecting upward and arranged in the front-rear direction. It is formed as.

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 and 4b, on the front surface side of the rear surface connection portion 4c, on the lower surface side of the connection portion 4d, and on the connection portion 4e. It refers to the space on the top side.
As shown in FIG. 14, 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. 1, 8, 14 to 16 and the like, the mounting portions 23 and 23 to which the engaged portions 10 and 10 constituting the front and rear locking mechanism are mounted are mounted on the left and right side surfaces of the rear connecting portion 4c. Is provided so as to protrude laterally.
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 and 23b. The first projecting portion 60 and the second projecting portion 61 are inserted through the first and second projecting portions 60, 61, 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 wider than 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 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 FIG. 8, the plurality of accommodating portions 24, 24 are for opening to the front side of the stationary member 4 and accommodating the urging member. More specifically, the housing portions 24, 24 are box-shaped bodies that are 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 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 accommodating portion 24.
The urging members accommodated in the plurality of accommodating portions 24 and 24 are coil springs, and one end portion is a hook portion formed in a hook shape, and the hook portion is hooked on the engaging portion 71. The other end portion is set so as to be caught by the retaining portion 24a when the urging member is accommodated in the accommodating portion 24.
That is, the engaging parts 71 and 71 are in a state of being biased by a coil spring toward a plurality of teeth 60a.

The plurality of support portions 25 and 26 are such that the inner link 6 and the outer link 7 constituting the X link mechanism are rotatably connected via the shaft S, and further support the inner link 6 and the outer link 7. is there. In other words, the fixed member 4 has a plurality of support portions 25 and 26 that rotatably support the inner link 6 and the outer link 7 via the shaft S.
Further, the plurality of support portions 25 and 26 are respectively provided above and below the surface where the left and right pillar holding portions 4a and 4b face each other. That is, it is in a state of being disposed at the four corners of the concave portion 22.
And the some support parts 25 and 26 are integrally formed with the rear surface connection part 4c. Further, one of the support portions 25, 25 arranged on the upper side (left side) is integrally formed with the pillar holding portion 4a, and the other (right side) is arranged apart from the pillar holding portion 4b. Further, one of the support portions 26, 26 disposed on the lower side is disposed away from the pillar holding portion 4a, and the other is integrally formed with the pillar holding portion 4b.

Further, the shaft S used for connecting the plurality of support portions 25, 25 and the inner link 6 is opposite to the side on which the operation portion 9 is provided with respect to the fixed side member 4 (on the right pillar holding portion 4 b side). ).
Therefore, insertion holes 25a and 25b are formed through the wall forming the pillar holding portion 4b along the insertion direction of the shaft S. A through hole 25c is formed in the support portion 25 on the pillar holding portion 4b side along the insertion direction of the shaft S. Further, a through hole 6b is formed in the rear end portion of the inner link 6 positioned between the plurality of support portions 25, 25 along the insertion direction of the shaft S and through the notch portion 6a. Further, the support portion 25 on the side of the pillar holding portion 4a is formed with an insertion hole 25d that does not penetrate the support portion 25 and accommodates the distal end in the insertion direction of the shaft S.
That is, the shaft S is inserted into the insertion hole 25d formed in the support portion 25 on the left pillar holding portion 4a side from the insertion hole 25a opened on the side surface of the right pillar holding portion 4b among the left and right pillar holding portions 4a and 4b. Until the rear end of the inner link 6 is connected. In other words, the shaft S includes through-holes and insertions formed in the links 6 and 7 and the support portions 25, 26, 35, and 36 adjacent to each other in the width direction. Inserted into the hole.

And between the right pillar holding | maintenance part 4b and the support part 25, as shown to FIGS. 7-9, the axial direction of the shaft S used for the connection of the stationary side member 4 and the inner side link 6 is provided. Second movement restricting means 110 for restricting movement is provided.
The second movement restricting means 110 is located on the insertion side of the shaft S.
The second movement restricting means 110 is formed so as to protrude from the peripheral portion of the insertion hole 25b formed through the inner wall of the pillar holding portion 4b toward the through hole 25c formed in the right support portion 25. And a regulating protrusion 111 that regulates the movement of the shaft S in the axial direction after being inserted into the through hole 25c. That is, the restricting protrusion 111 is for suppressing the movement of the shaft S.

The restricting projection 111 has elasticity and is disposed so that the tip thereof faces the center of the shaft S after being inserted into the through hole 25c. Further, the base end portion is arranged so as to avoid the insertion hole 25b formed through the inner wall of the pillar holding portion 4b. Therefore, when the shaft S is inserted, the distal end side of the restricting protrusion 111 is elastically deformed in a direction away from the through hole 25c.
Although not shown, the restricting protrusion 111 may be formed so as to gradually taper toward the tip. With such a configuration, the shaft S becomes easier to insert because it is more easily elastically deformed. Furthermore, since the base end portion of the restricting projection 111 is thick, it is possible to improve the rigidity of the inner wall of the pillar holding portion 4b in which the insertion hole 25b is formed.

In addition, an opening 112 is formed at a position of the fixed member 4 that faces the restricting protrusion 111. In other words, the opening 112 is formed at a position facing the restricting protrusion 111 in the rear surface connecting portion 4 c and functions as a confirmation window for the restricting protrusion 111.
Further, the opening 112 and the insertion hole 25b formed through the inner wall of the pillar holding portion 4b are connected. That is, the opening 112 and the insertion hole 25b are continuous holes, and the opening area can be increased. By increasing the opening area in this manner, the amount of wall around the restricting protrusion 111 can be reduced, and the restricting protrusion 111 is easily elastically deformed.

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. That is, the plurality of support portions 25, 26, 35, 36 include a plurality of slide support portions that slidably support the end portions of the inner link 6 and the outer link 7 in the vertical direction. The plurality of lower support portions 26 and 26 in the fixed member 4 are slide support portions.
More specifically, each of the plurality of lower support portions 26, 26 is formed in an elongated shape in the up-down direction and has a concave recess section (not shown: provided that the shaft S is inserted). And a shape similar to the accommodation recess 36c shown in FIGS. The housing recesses of the plurality of lower support portions 26, 26 are elongated holes (slits or grooves) that are long in the vertical direction along the plurality of support portions 26, 26 on the lower side. And the outer link 7 is connected to the said some support parts 26 and 26 via the shaft S inserted in the accommodation recessed part. That is, of the rear end portions of the inner link 6 and the outer link 7, the lower end portion (the rear end portion of the outer link 7) is supported so as to be slidable in the vertical direction with respect to the support portions 26 and 26. Has been.

Further, the shaft S used for connecting the plurality of support portions 26, 26 and the outer link 7 is opposite to the side on which the operation portion 9 is provided with respect to the fixed side member 4 (on the side of the right pillar holding portion 4b). ).
The shaft S is an outer link from an insertion hole opened on the side surface of the right pillar holding portion 4b of the left and right pillar holding portions 4a and 4b to a receiving recess formed in the support portion 26 on the left pillar holding portion 4a side. 7 is inserted so as to connect the rear end portions thereof. In other words, the shaft S includes a through hole formed in each of the links 6 and 7 and the support portions 25, 26, 35, and 36 adjacent to each other in the width direction and the support portion. Inserted into the recess.
And the space | interval of the rear side edge part of the inner side link 6 and the outer side link 7 is each time of each of the inner side link 6 and the outer side link 7 rather than the time of the edge part (lower end part of the outer side link 7) located below. The direction when assembling the end portions to the fixed-side member 4 (the support portions 25 and 26) is set wider.

  The lock holding portion 27 holds an upper and lower lock member (not shown) constituting an upper and lower lock mechanism, and is provided in the vicinity of the lower end portion of the left pillar holding portion 4a. That is, the upper and lower lock members are held by the lock holding portion 27 on the operation portion 9 side. The vertical lock member can be operated by the operation unit 9.

(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 4. More specifically, as shown in FIGS. 1 to 3, 14, and 15, the movable side member 5 is movable back and forth with respect to the fixed side member 4.
The movable member 5 is made of resin, and includes a front cover 30, a rear cover 31, bottom edge covers 32 and 32, a holding portion 33, a button attachment portion 34, and a plurality of support portions 35 and 36. The guide portion 37 and the protruding rib 38 are provided. The movable member 5 includes a front cover 30, a rear cover 31, and bottom edge covers 32 and 32 which are formed separately.
Moreover, it can comprise as an internal hollow case body by combining the front side cover 30 and the rear side cover 31. FIG.

The front cover 30 is for supporting the head. The front cover 30 includes a front wall portion 30a that receives the head, and a peripheral wall portion 30b that is provided rearward along the peripheral edge of the front wall portion 30a. Moreover, each part which comprises the front side cover 30 is integrally formed.
Furthermore, as shown in FIGS. 2 to 4 and 13, the front wall portion 30 a includes a step portion 30 h and a plurality of connecting walls 30 i, 30 j, 30 k, 30 l, and 30 m.

The step portion 30h is provided so as to protrude rearward at a position sandwiching the front end portion (lower end portion) of the inner link 6, and is for restricting the position of the inner link 6 in the left-right direction.
The step portion 30h is processed so that the front side of the front wall portion 30a has a concave shape and the rear side thereof has a convex shape correspondingly. In addition, a plurality of support portions 36 are provided integrally with the step portion 30h.

The connecting wall 30i is provided between the plurality of support portions 36, 36 located on the lower side and the other plurality of support portions 35, 35 located on the upper side, and ribs that connect the support portions 35, 36 to each other. It is.
The connection wall 30j is a rib that is provided between the plurality of support portions 35, 35 located on the upper side and the peripheral wall portion 30b, and connects the plurality of support portions 35, 35 and the peripheral wall portion 30b.
The connection walls 30k, 30l, and 30m are ribs that are provided between the plurality of support portions 36 and 36 and the peripheral wall portion 30b and connect the plurality of support portions 36 and 36 and the peripheral wall portion 30b.
More specifically, the connecting wall 30k is provided between the plurality of support portions 36, 36 and the lower portion of the peripheral wall portion 30b. In addition, a pair of connection walls 301 is provided between the support portion 36 located on the left side (the operation portion 9 side) and the left side portion of the peripheral wall portion 30b. Further, a pair of connection walls 30m are provided between the support portion 36 located on the right side and the right side portion of the peripheral wall portion 30b.

  Both the connecting wall 30l and the connecting wall 30m are ribs extending in the lateral direction, but their height positions are set so as to be shifted vertically as shown in FIG. That is, since the operation part 9 is provided in the vicinity of the connection wall 301, the connection wall 301 is arranged avoiding the operation part 9. In other words, the connecting wall 30l is provided at a position that does not interfere with the operation unit 9 (and the rotation operation member 13) that operates when the headrest is operated.

In addition, although the support part 35 is in the state arrange | positioned between the connection wall 30i and the connection wall 30j, it is not restricted to this, These connection wall 30i and the connection wall 30j are integrally formed. May be. In this case, the integrated connecting wall functions as a rib that connects the support portion 36 and the upper portion of the peripheral wall portion 30b.
In addition, for example, the front cover 30 is appropriately provided with, for example, a boundary portion between the front wall portion 30a and the peripheral wall portion 30b and a reinforcing rib for effectively supporting the load on the head. .

The rear cover 31 includes a rear wall portion, and a peripheral wall portion 31b provided forward from the upper, lower, left and right peripheral ends of the rear wall portion. The case body is configured by connecting and fixing the peripheral wall portion 31 b of the rear cover 31 and the peripheral wall portion 30 b of the front cover 30.
A rib for reinforcing a boundary portion between the rear wall portion and the peripheral wall portion 31b is appropriately provided between the front surface of the rear wall portion 31a and the peripheral wall portion 31b.
In addition, although the surrounding wall part 30b of the front side cover 30 and the surrounding wall part 31b of the rear side cover 31 are fitting-connected by employ | adopting a fitting structure, it is not specifically limited.

1 and 2, the front cover 30 is provided at a position corresponding to a base end portion 63 of the engaged portion 10 described later, and a base end storage portion 30d in which the base end portion 63 is stored. Prepare. Further, the base end storage portion 30 d is formed so as to protrude from the rear surface of the front cover 30 and has a wall portion 30 e surrounding the base end portion 63.
Although not shown, 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 a tip storage in which the tip is stored. A part.
That is, the engaged portion 10 is arranged along the front-rear direction, the base end portion 63 is held by the front cover 30, and the tip of the first protrusion 60 and the tip of the second protrusion 61 are the rear cover. 31 will be held. 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 in 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 long 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 wall portion 30b and the peripheral wall portion 31b, respectively. The notches 30c and 31c are formed so as to divide the long hole into a so-called half, and the long hole can be formed on the lower surface of the case body by connecting the peripheral wall 30b and the peripheral wall 31b. Yes.
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. Moreover, the cylindrical part 32a is also arrange | positioned so that the length direction may follow the front-back movement direction of the movable side member 5. FIG.

  The holding portion 33 holds a rotation shaft portion 82 of the rotation operation member 13 to be described later, and is provided in the peripheral portion of the operation portion 9 as shown in FIG.

As shown in FIGS. 1 to 3 and 13, 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 the rear side. It is arranged on the side of the cover 31.
The button mounting portion 34 is a cylindrical body that protrudes from the side surfaces (the peripheral wall portions 30 b and 31 b) of the front cover 30 and the rear cover 31, and is formed so as to surround the button 9.

The plurality of support portions 35 and 36 are rotatably connected to the inner link 6 and the outer link 7 that constitute the X link mechanism, and further support the inner link 6 and the outer link 7.
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, it is arranged at four places 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.

The shaft S used for connecting the plurality of support portions 35, 35 and the outer link 7 is assembled from the side (right side) opposite to the side where the operation portion 9 is provided with respect to the movable side member 5.
Therefore, an insertion hole 35 a is formed through the right upper end portion of the peripheral wall portion 30 b of the front cover 30 along the insertion direction of the shaft S. A through hole 35b is formed in the support portion 35 on the insertion hole 35a side along the insertion direction of the shaft S. In addition, an insertion hole 35c that does not penetrate the support portion 35 and accommodates the shaft S in the insertion direction is formed in the support portion 35 opposite to the insertion hole 35a.
That is, the shaft S connects the front end portion of the outer link 7 from the insertion hole 35a formed in the right portion of the peripheral wall portion 30b of the front cover 30 to the insertion hole 35c formed in the left support portion 35. Inserted. In other words, the shaft S includes through-holes and insertions formed in the links 6 and 7 and the support portions 25, 26, 35, and 36 adjacent to each other in the width direction. Inserted into the hole.

And between the right side part of the surrounding wall part 30b of the front side cover 30, and the support part 35, as shown in FIG. 4, FIG. 5, the shaft S used for the connection of the movable side member 5 and the outer side link 7 is shown. First movement restricting means 100 for restricting movement in the axial direction is provided.
The first movement restricting means 100 is located on the insertion side of the shaft S.
The first movement restricting means 100 includes a guide portion 101 that guides the shaft S to the through hole 35b when the shaft S is inserted into the through hole 35b formed in the support portion 35 on the insertion hole 35a side. And a restricting portion 104 that is integrally formed on the support portion 35 side of the guide portion 101 and restricts the movement of the shaft S in the axial direction after being inserted into the through hole 35b. That is, the guide part 101 guides the shaft S to the through hole 35b, and the restricting part 104 suppresses the movement of the shaft S.

The guide part 101 is integrally formed with the movable side member 5 at a position sandwiching the inserted shaft S in the movable side member 5 and has a square shape so that the interval gradually decreases in the insertion direction of the shaft S. The first guide wall 102 and the second guide wall 103 are disposed so as to face each other.
More specifically, the first guide wall 102 and the second guide wall 103 are integrally formed on the front wall portion 30a of the front cover 30 and the right side portion of the peripheral wall portion 30b. That is, the front wall 30a side ends of the first guide wall 102 and the second guide wall 103 are integrally formed with the front wall 30a, and the right peripheral wall 30b side end is integrally formed with the right side portion of the peripheral wall 30b. Is formed. The other end is a free end and is set so as not to interfere with other members / parts. Therefore, the end portion on the support portion 35 side is disposed away from the support portion 35.
Further, the first guide wall 102 and the second guide wall 103 have elasticity, and are deformed when the shaft S is guided, and elastically return after the passage of the shaft S.

Moreover, the 1st guide wall 102 and the 2nd guide wall 103 are the states which the edge part by the side of the support part 35 protrudes back, and the other part was dented ahead. That is, each of the first guide wall 102 and the second guide wall 103 at the end portion on the support portion 35 side is provided with projecting portions 102a and 103a that protrude toward the shaft S side. The first guide wall 102, the second guide wall 103 and escape portions 102 b, 103 b that avoid interference between the fixed side member 4 are provided at positions avoiding the portions.
More specifically, the protrusions 102a and 103a are arranged on a straight line (course through which the shaft S passes) connecting the insertion hole 35a and the through hole 35b. The escape portions 102b and 103b are disposed closer to the front wall portion 30a than the straight line connecting the insertion hole 35a and the through hole 35b.

The regulation part 104 points out the position nearest to the support part 35 side among the first guide wall 102 and the second guide wall 103. For convenience of explanation, the restricting portion 104 on the first guide wall 102 side is referred to as a first restricting portion 104a, and the restricting portion 104 on the second guide wall 103 side is referred to as a second restricting portion 104b.
As described above, since the first guide wall 102 and the second guide wall 103 are arranged so that the end portions on the support portion 35 side are separated from the support portion 35, the first restricting portion 104a and the second restricting portion 103 are disposed. A position of the portion 104b facing the shaft S inserted into the through hole 35b is disposed away from the support portion 35. More specifically, the first restricting portion 104a and the second restricting portion 104b are in a state in which a portion extending from the front wall portion 30a to the protruding direction side end portion is separated from the support portion 35. Thereby, the first guide wall 102 and the second guide wall 103 are more easily elastically deformed.

  According to the first movement restricting means 100 as described above, since the first guide wall 102 and the second guide wall 103 are arranged to face each other in a C shape, the distal end of the shaft S in the insertion direction is Even if the first guide wall 102 or the second guide wall 103 is shifted and inserted, the trajectory can be easily corrected along the first guide wall 102 or the second guide wall 103.

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. That is, the plurality of support portions 25, 26, 35, 36 include a plurality of slide support portions that slidably support the end portions of the inner link 6 and the outer link 7 in the vertical direction. The plurality of lower support portions 36, 36 in the movable member 5 are slide support portions.
More specifically, each of the plurality of lower support portions 36, 36 has an accommodation recess 36c that is formed in a vertically long shape and has a concave cross-section into which the shaft S is inserted. The housing recesses 36c, 36c of the plurality of lower support portions 36, 36 are elongated holes (slits or grooves) that are long in the vertical direction along the plurality of support portions 36, 36 on the lower side. Yes. The inner links 6 are connected to the plurality of support portions 36, 36 through shafts S inserted into the housing recesses 36c, 36c. That is, of the front end portions of the inner link 6 and the outer link 7, the lower end portion (the front end portion of the inner link 6) is supported slidably in the vertical direction with respect to the support portions 36 and 36. Yes.

Further, the shaft S used for connecting the plurality of support portions 36, 36 and the inner link 6 is assembled from the side (right side) opposite to the side where the operation portion 9 is provided with respect to the movable side member 5.
Therefore, an insertion hole 36 a is formed through the right lower end portion of the peripheral wall portion 30 b of the front cover 30 along the insertion direction of the shaft S. A through hole 36b is formed in the support portion 36 on the insertion hole 36a side along the insertion direction of the shaft S. The through hole 36 b communicates the space between the inside of the housing recess 36 c in the right support part 36 and the right support part 36 and the right lower end part of the peripheral wall part 30 b of the front cover 30. The through hole 36b is disposed at the lower end of the housing recess 36c in the right support portion 36.
That is, the shaft S connects the front end portion of the inner link 6 from the insertion hole 36a opened at the lower right end portion of the peripheral wall portion 30b of the front cover 30 to the accommodation recess 36c formed in the left support portion 36. Inserted. In other words, the shaft S includes through-holes and insertions formed in the links 6 and 7 and the support portions 25, 26, 35, and 36 adjacent to each other in the width direction. Inserted into the hole.
And the space | interval of the front side edge part of the inner side link 6 and the outer side link 7 is each edge part of the inner side link 6 and the outer side link 7 rather than the time of the edge part located below (front end part of the inner side link 6) sliding. Is set wider when assembled to the movable member 5 (the support portions 35 and 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 and the rear end of the inner link 6 and the outer link 7 Of these, the upper or lower end (the lower end in the present embodiment) is supported so as to be slidable in the vertical direction with respect to the lower support portions 26 and 36.
The intervals between the front end portions of the inner link 6 and the outer link 7 and the intervals between the rear end portions of the inner link 6 and the outer link 7 are the receiving recesses 36c of the support portions 26, 36 at the lower ends. Is wider than when the end portions of the inner link 6 and the outer link 7 are assembled to the front cover 30 and the stationary member 4, respectively.
That is, the shaft S is inserted from the through holes 26 b and 36 b 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. However, the shaft S is set so as not to be lowered to the positions of the through holes 26b and 36b after assembly.

Of the plurality of lower support portions 36 and 36 (the support portions 36 and 36 for sliding the shaft S) provided on the front cover 30 of the present embodiment, the shaft S is positioned on the distal end side in the insertion direction. The slide support portion 36 (left support portion 36) for housing the tip end of the shaft S in the insertion direction has the housing recess 36c as described above.
The housing recess 36 c is formed in a vertically long shape and has a concave cross section that opens to the insertion side of the shaft S.
Then, as shown in FIG. 12, a positioning portion for positioning in the insertion direction of the shaft S so as to abut against the distal end in the insertion direction of the shaft S inserted into the accommodation recess 36c. 36d is provided.

The positioning portion 36d is integrally formed at the lower end inside the housing recess 36c and protrudes toward the insertion side of the shaft S inserted into the housing recess 36c. That is, the positioning portion 36d comes into contact when the shaft S is inserted from the insertion hole 36a to the end.
In addition, since the shaft S is firmly held inside the through hole 6b of the inner link 6, it is difficult to move to the back of the positioning portion 36d even after insertion. Therefore, if the shaft S is brought into contact with the positioning portion 36d when the shaft S is assembled, when the shaft S slides up and down in the housing recess 36c as the movable member 5 slides, There is an advantage that the tip of the shaft S is difficult to come into contact with the inner wall (the inner wall in the insertion direction).
Further, in view of the configuration of the positioning portion 36d and the configuration related to the distance between the front end portions of the inner link 6 and the outer link 7 as described above, it is a process of the headrest 1 manufacturing method. And the characteristic arises in the process of assembling the front side edge part of the inner side link 6 to the several support parts 36 and 36 of the lower side of the movable side member 5. FIG.
That is, when the front end portion of the inner link 6 is assembled to the left support portion 36 via the shaft S, the shaft S is inserted into the receiving recess 36c while being abutted against the positioning portion 36d. . Thereafter, the front end portion of the outer link 7 is assembled to the plurality of upper support portions 35, 35 via the shaft S.
Note that the configuration related to the positioning portion 36d can also be applied to the lower left support portion 26 in the fixed-side member 4.
Furthermore, in the present embodiment, the positioning portion 36d is integrally provided inside the housing recess 36c, but is not limited thereto. That is, the positioning portion 36d may be retrofitted inside the housing recess 36c, or a separate positioning portion 36d may be inserted from the outside.

The guide part 37 guides the movement of the movable side member 5, and includes a lower contact part 37a and upper rail parts 37b and 37b as shown in FIGS.
The lower contact portion 37a is provided on the inner surface side of the lower end portion of the case body and is formed in a convex shape, and can guide the movement of the movable side member 5 by contacting the lower surface of the fixed side member 4.
The upper rail portions 37b and 37b are provided so as to protrude downward on the inner surface side of the lower end portion of the case body, and the side surfaces of the upper contact portions 4f and 4f of the fixed side member 4 are in contact with the side surfaces thereof. The movement of the movable member 5 can be guided.
When the movable member 5 is moved in the front-rear direction, the lower contact portion 37a, which is the guide portion 37, and the upper rail portions 37b and 37b move while always contacting the upper and lower ends of the fixed member 4. It becomes.

As shown in FIG. 1, FIG. 2, FIG. 13, etc., the protruding rib 38 is formed on the rear surface side of the front wall portion 30a of the front cover 30 from the upper surface side of the peripheral wall portion 30b through the front wall 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 at the center between the plurality of support portions 35. On the other hand, at 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, 38 are fitted is formed. Then, when the outer link 7 is connected to the plurality of support portions 35, 35 by the shaft S, the protruding ribs 38, 38 are fitted into the cutout portions 7 a. That is, the movable side member 5 not only supports the outer link 7 by the plurality of support portions 35, 35 but also further supports the center in the width direction of the outer link 7 located on the movable side member 5 side.
When the protruding ribs 38 and 38 are fitted into the notch 7a, the outer surfaces of the protruding ribs 38 and 38 are in contact with both side surfaces of the notch 7a.

(X link mechanism)
Among the X link mechanisms, the inner link 6 has an upper end (rear end) arranged on the fixed side member 4 side and a lower end (front end) movable as shown in FIGS. It is a link arrange | positioned at the side member 5 side. Further, the lower end side is inserted into an insertion hole 51 (described later) of the outer link 7.
The outer link 7 is a link whose upper end (front end) is disposed on the movable member 5 side and whose lower end (rear end) is 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 shaft 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 the left and right sides of the fixed side member 4.
The lower end portion of the outer link 7 is disposed so as to be positioned between a plurality of lower support portions 26 and 26 disposed on the left and right sides of the fixed side 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 and 36 disposed on both the left and right sides of the movable side member 5.
The 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 member 5.
Further, as described above, at least the upper ends of the inner link 6 and the outer link 7 are respectively supported at the center in the width direction by the fixed side member 4 and the movable side member 5 (that is, the projecting ribs 28, 38 and (Depending on the relationship with the notches 6a and 7a).

Further, as shown in FIG. 11 and the like, 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. 14, the inner link 6 and the outer link 7 are suitable for the concave portion 22 of the fixed side member 4. It is a suitable shape to fit in.
The inner link 6 and the outer link 7 are connected to each other through a shaft S so that the intermediate portions intersecting each other can rotate.

The shaft S is inserted into through holes 8 a, 8 b, 8 c formed in the intermediate part of the inner link 6 and the intermediate part of the outer link 7. The through hole 8 a is formed from the right side surface of the intermediate portion of the outer link 7 to the insertion hole 51, and the through hole 8 c is formed from the left side surface of the intermediate portion of the outer link 7 to the insertion hole 51. Further, the through hole 8b is formed so as to penetrate the intermediate portion of the inner link 6 to the left and right.
10 and 11, the movement of the shaft S in the axial direction is restricted to the side surface of the outer link 7 located on the insertion side (right side) of the shaft S of the inner link 6 and the outer link 7. The third movement restricting means 120 is provided.
In addition, as shown in FIG. 13, the side surface of the outer link 7 positioned on the insertion side of the shaft S is formed to be recessed toward the position where the through holes 8a, 8b, and 8c are formed.
The 3rd movement control means 120 is provided in the peripheral part of through-hole 8a, 8b, 8c among the side surfaces. In other words, the third movement restricting means 120 is disposed in the depression on the side surface of the outer link 7.
And the 3rd movement control means 120 is provided with the elastic extension parts 121 and 121, the guide parts 122 and 122, and the control parts 123 and 123. FIG.

A pair of elastic extending portions 121 are provided on the side surface of the outer link 7 so as to extend toward the through hole 8a. Further, the elastic extension portion 121 is integrally formed with the side surface of the outer link 7.
And the said elastic extension part 121 is elastically deformed at least in the insertion direction of the said shaft S at the time of insertion to the through-hole 8a of the shaft S by having elasticity.
Further, the elastic extension portion 121 has a curved portion 121 a that curves in a direction opposite to the positions of the guide portion 122 and the restricting portion 123. More specifically, the elastic extension parts 121 and 121 extend from the side surface of the outer link 7 to the side, bend so as to form an arc upward and downward, and further pass through the hole in the vertical direction. It is formed so as to extend to the 8a side. The ends in the extending direction of the pair of elastic extending portions 121, 121 are arranged at positions separated from the through hole 8a so as not to contact each other.
In addition, the base end part of the elastic extension part 121,121 integrally formed with respect to the side surface of the outer link 7 is in the vicinity of the ribs 53, 53 formed on the surface of the outer link 7, as shown in FIG. Is provided. Thereby, the rigidity improvement in the base end part of the elastic extension parts 121 and 121 can be aimed at.
Further, the vicinity of the through holes 8a and 8c on the side surface of the outer link 7 is formed wider than the end side. And a pair of elastic extension parts 121 and 121 are arrange | positioned so that it may be settled in the width | variety of the side surface of the outer side link 7, as shown in FIG.

The guide portion 122 is positioned at the distal end of the elastic extension portion 121 in the extending direction, and guides the shaft S to the through hole 8a when the shaft S is inserted into the through hole 8a.
Moreover, the guide part 122 is provided so that it may protrude from the extension direction front-end | tip of the elastic extension part 121 to the through-hole 8a side. A pair of guide parts 122 and 122 located at the extension direction tip of a pair of elastic extension parts 121 and 121 are arranged in the position away from penetration hole 8a so that it may not contact mutually.
The shaft S is set so as to pass between the pair of guide portions 122 and 122. Therefore, the guide portions 122 and 122 are guide surfaces 122a for elastically deforming the elastic extension portions 121 and 121 so as to be shifted in a direction orthogonal to the axial direction of the shaft S when the shaft S is inserted into the through hole 8a. 122a.
That is, as shown in FIG. 11, the guide surface 122a includes an arcuate portion and is formed so as to be cut toward the through hole 8a. Further, the upper guide surface 122a in the present embodiment is arranged to be shifted rearward with respect to the central axis of the elastic extension portion 121 in a side view, and the lower guide surface 122a is elastic in a side view. The extension part 121 is arranged so as to be offset toward the front side with respect to the central axis.
When the shaft S is inserted between the guide surfaces 122a and 122a, the pair of elastic extending portions 121 and 121 are elastically deformed as indicated by arcuate arrows in FIG. That is, the upper elastic extension portion 121 is elastically deformed to the front side orthogonal to the axial direction of the shaft S, and the lower elastic extension portion 121 is elastically deformed to the rear side orthogonal to the axial direction of the shaft S. . Then, since the upper and lower elastic extending portions 121 and 121 are elastically deformed alternately in the front and rear directions, the guide surfaces 122a and 122a face each other. Therefore, the shaft S is inserted between the facing guide surfaces 122a and 122a. be able to.

  The restricting portion 123 is located at the distal end of the elastic extending portion 121 in the extending direction, and restricts the movement of the shaft S in the axial direction after being inserted into the through hole 8a. The restricting portion 123 is a distal end in the extending direction of the elastic extending portion 121 and points to an end surface in the protruding direction of the guide portion 122, and is formed on the shaft S after being inserted into the through holes 8a, 8b, and 8c. It arrange | positions so that it may oppose. That is, the restriction part 123 points to a position closest to the through hole 8 a among the elastic extension parts 121 formed including the guide part 122 and the restriction part 123.

  A stopper portion 8d is provided on the side surface of the outer link 7 opposite to the insertion side of the shaft S (left side). The stopper portion 8d is disposed so as to overlap the through hole 8c in the intermediate portion of the outer link 7, and functions as a stopper at the distal end in the insertion direction of the shaft S inserted into the through holes 8a, 8b, 8c.

When inserting the shaft S into the through holes 8a, 8b, 8c, the shaft S is inserted toward the through hole 8a from the gap between the pair of guide portions 122, 122, and is opposite to the insertion direction of the shaft S. Insert until the end on the side exceeds the position of the restricting portions 123, 123. Since the elastic extending portions 121 and 121 have elasticity, when the shaft S is inserted, the elastic extending portions 121 and 121 are elastically deformed in a direction in which the through hole 8a side and the guide surfaces 122a and 122a face each other, and the opposite end portions are the regulating portions 123 and 123. If it exceeds, it will return to elasticity.
The inner link 6 and the outer link 7 are connected to each other so as to be rotatable about the shaft S as a rotation axis.

The inner link 6 of the present embodiment is formed in a substantially Y shape as a whole, and the width in the left-right direction of the part from the lower end portion inserted through the insertion hole 51 of the outer link 7 to the center portion is the same. The upper end portion is narrower than the width.
The inner link 6 includes a plurality of connection portions 42 provided at the upper and lower ends and connected to and supported by the support portion 25 and the support portion 36, respectively. A through hole 6 b is formed for the plurality of connection portions 42.
Notches 6a and 6a are formed at the upper and lower ends of the inner link 6.

  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 wider in the left-right direction as a whole than the inner link 6, and the central portion and the lower end portion of the inner link 6 are inserted through the central portion thereof. An insertion hole 51 is formed.
The outer link 7 includes a plurality of connection portions 52 that are provided at the upper and lower ends and are connected to and supported by the support portion 26 and the support portion 35, respectively. A through hole 7 b is formed for the plurality of connection portions 52.
Notches 7 a and 7 a are formed at the upper and lower ends of the outer link 7.

  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.

  By adopting the configuration as described above, the movable side member 5 can be moved in the direction away from the fixed side member 4 and in the direction of returning backward with respect to the fixed side member 4 via the X link mechanism which is a movable mechanism. .

  Next, the front and rear locking mechanism and the vertical locking 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 that engages with the plurality of engaged portions 10, and a bias that urges the lock member 11 toward the plurality of engaged portions 10. And a rotation operation member 13 for operating the lock member 11 while being rotatably held by the movable side member 5.

The plurality of engaged portions 10 are made of metal, and are disposed along the front-rear direction as shown in FIGS. 1, 14 to 16, and the like. As described above, the front cover 30, the rear cover 31, It is pinched by.
Moreover, the said some to-be-engaged part 10 is each arrange | positioned rather than the left-and-right headrest pillars 2 and 2 in the width direction outer side as mentioned above.

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 so as to protrude 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 projecting portion 60 projects from the lower end portion of the base end portion 63 toward the rear cover 31. Further, the second protruding portion 61 protrudes toward the rear cover 31 from a position near the center upper portion of the base end portion 63.

A plurality of teeth 60 a for forming the engaged portion 10 in a ratchet structure is formed on the first projecting portion 60 so as to project obliquely upward from the upper end edge of the first projecting portion 60.
The 2nd protrusion part 61 is parallel to the 1st protrusion part 60, and is arrange | positioned at intervals from the upper end part of several teeth 60a .... A gap 62 is defined between the second protrusion 61 and the plurality of teeth 60 a of the first protrusion 60.
Note that the distal ends of the first projecting portion 60 and the second projecting portion 61 are accommodated in the distal end accommodating portion of the rear cover 31.
Then, the engaged parts 10 and 10 are configured such that the first protrusion 60 is inserted into the through hole 23a of the mounting part 23 and the second protrusion 61 is inserted into the through hole 23b of the mounting part 23, thereby They are arranged outside the pillars 2 and 2 in the width direction. The first protrusion 60 and the second protrusion 61 move in the through-holes 23a and 23b in the front-rear direction 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, and as shown in FIGS. 70, engaging portions 71 and 71, and connecting portions 72 and 72.

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. The plurality of holding portions 21 and 21 and the central holding portion 21a provided on the rear surface of the fixed-side member 4 are inserted from the spaces between the tips of the plurality of movement restricting portions and the tips of the plurality of movement restricting portions. It is installed in this way.
Further, the held portion 70 is disposed in the gap 62 between the first protrusion 60 and the second protrusion 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 urged toward the plurality of teeth 60a. To match. Further, the engaging portions 71 and 71 are disposed in front of the fixed side member 4.
The engaging portions 71 and 71 are arranged at positions where they are engaged with the plurality of teeth 60a by being urged by the urging member, and are in a direction opposite to the direction of urging by the urging member. In the case of the operation, it is possible to move 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.
Moreover, the edge part (front-end | tip part) by the side of several teeth 60a ... among these engaging parts 71 and 71 protrudes inward rather than the to-be-engaged parts 10 and 10, as shown in FIG. However, the protruding length is set so as not to reach the X link mechanism.

The connecting portions 72, 72 are metal shafts, and connect both end portions of the held portion 70 and the respective end portions of the plurality of engaging portions 71, 71. Placed in the direction.
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. Furthermore, 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. 1, a resin-made buffer member 73 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 arranged is connected to the one connecting portion 72, one of the held portion 70 and the engaging portion 71. The buffer member 73 is attached so as to cover the end portion on the portion 72 side. In other words, the one connecting portion 72 includes the buffer member 73.

  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. According to the buffer member 73, the movement range of the lock member 11 is restricted, and the lock member 11 can be prevented from coming into direct contact with the stationary member 4, thereby suppressing the generation of abnormal noise.

The urging member urges the engaging portions 71 and 71 of the lock member 11 toward the engaged portion 10 side (the plurality of teeth 60a...), And as described above, in the present embodiment. A plurality of coil springs housed in the plurality of housing portions 24, 24 are employed.
In addition, the hook part hooked on the engaging part 71 among the biasing members is hooked on the engaging part 71 from above.

The rotation operation member 13 is made of metal, and is rotatably held by the movable member 5 and operates the engaging portion 71 of the lock member 11. As shown in FIGS. 1, 2, and 13 to 16, 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 when the engagement portion 71 of the lock member 11 is operated. It 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. 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 operation portion 80 is for operating the front / rear locking mechanism, and is a plate-like portion that is located below the coupling portion 72 of the lock member 11 and abuts against the buffer member 73 from below. Further, the leading end of the first operation portion 80 in the protruding direction is disposed below the rotation 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 unit 81 is for operating the up-and-down lock mechanism, and protrudes obliquely downward from the end of the first operation unit 80 on the fixed side member 4 side and toward the operation unit 9 side. In this way, they are integrally formed. The distal end of the second operation portion 81 in the protruding direction is disposed below the upper and lower lock member (lock holding portion 27), and the vicinity of the center of the second operation portion 81 in the protruding direction is the upper and lower lock member (lock holding portion 27). It is arrange | positioned at the height substantially equal.
Further, the side surface of the fixed side member 4 of the second operation portion 81 is separated from the vertical lock member when the vertical lock mechanism is locked, and is in contact with the vertical lock member when the lock is released.
If such a second operation portion 81 is rotated upward about the rotation shaft portion 82, the upper and lower lock members can be operated so as to be pushed into the fixed 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.
Further, the rotation shaft portion 82 is made of a metal shaft, is held by the rotation operation member 13, and is inserted into a hole formed in the holding portion 33.

  The urging member 83 is a coil spring, and one end thereof is disposed so as to contact the upper surface of the first operation unit 80, and the other end is disposed so as to contact the inner surface of the front cover 30 or the rear cover 31. ing. That is, when the rotation operation member 13 is operated so as to rotate the first operation unit 80 upward, one end portion and the other end portion of the urging member 83 approach each other. Therefore, when the operation of the rotation operation member 13 is stopped, the first operation unit 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 locked and locked at a plurality of positions, that is, at positions where the engaging portions 71 are engaged with the plurality of teeth 60a. Can be unlocked.

In the front-rear locking mechanism as described above, when the engaging portion 71 is engaged with the plurality of teeth 60a..., Abnormal noise (contact noise between metals) may occur due to the metal. In order to suppress the occurrence of such abnormal noise, it is desirable to provide an abnormal noise suppression means for the plurality of teeth 60a.
Specifically, a configuration in which the engaging portion 71 and / or the plurality of teeth 60a... Is covered (molded) with a resin material (not shown) is employed as the noise suppressing means. The part covered with the resin material may be the entire engaging part 71 or the plurality of teeth 60a... (The first projecting part 60), or only the contact part between the engaging part 71 and the plurality of teeth 60a.
For example, a configuration in which a lubricant (not shown) such as grease is applied to the engaging portion 71 and / or the plurality of teeth 60a.

For example, as shown in FIG. 16, a configuration in which the first projecting portion 60 is covered with a resin cover material 64 may be employed as other noise suppression means.
If it demonstrates in detail, the cover material 64 will cover from the lower side of the 1st protrusion part 60 to the intermediate grade of the height direction of several teeth 60a .... Accordingly, when the engaging portion 71 engages with the plurality of teeth 60a, first, the upper edge of the cover member 64 is brought into contact.
In addition, the cover material 64 may coat | cover only the outer surface side of the 1st protrusion part 60, may coat | cover only an inner surface side, and may coat | cover both an outer surface and an inner surface.
Further, when covering the first projecting portion 60 with the cover material 64, the first projecting portion 60 including the cover material 64 can be inserted and moved into the through hole 23 a of the mounting portion 23.

  By adopting the various configurations as described above, it is possible to suppress noise generated when the metal engaging portion 71 is engaged with the plurality of metal teeth 60a.

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

The plurality of notches 15 may be formed in the headrest pillar 2 on the side where at least the upper and lower lock members are provided among the left and right headrest pillars 2 and 2. However, since the plurality of notches 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 and 2 are used in this embodiment. A plurality of notches 15 are formed on both sides.
Further, as shown in FIG. 1, 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. 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, respectively, as described above, whereby the fixed side member 4 is moved in the vertical direction along the left and right headrest pillars 2 and 2. It is possible to move to.
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 members are engaged with the engagement portion (not shown) that engages with the notch 15 inside the lock holding portion 27 and the urging force that urges the engagement portion in a direction to engage the notch 15. A member (not shown).
Therefore, if the upper and lower lock member is operated to be pushed into the back side of the lock holding portion 27, the engagement portion (not shown) is separated from the notch 15, and if the upper and lower lock member is not operated, the engagement portion (not shown) is notched. Is engaged.

The rotation operation member 13 includes the second operation portion 81 for operating the up / down lock member as described above.
In addition, the first operation unit 80 and the second operation unit 81 rotate in conjunction with each other, and the second operation unit 81 releases the lock by the vertical lock mechanism simultaneously with the unlocking operation of the front / rear lock mechanism by the first operation unit 80. The action 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 second operating portion 81 has the button 9 in contact with any part in the length direction, and any part in contact with the vertical lock member. Further, the rotation 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 changes according to the back-and-forth movement of the movable side member 5. However, the positional relationship between the front cover 30 and the rear cover 31 that are the movable members 5 and the button 9 is not changed.

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

The button 9 which 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 abuts on the rotation operation member 13. And the rotation operation member 13 can be operated now by being pushed in to the internal hollow part side of a 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 cylindrical portion 91 in a state where the button main body 90 is inserted into the cylindrical portion 91. Further, 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 is movable forward and backward along the cylindrical portion 91 so as not to interfere with 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 lock member 11 is operated by the first operation portion 80. The upper / lower lock member can be operated by the second operation portion 81.

(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. Further, the stationary side member 4 including the left and right pillar holding portions 4 a and 4 b 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. 14 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.

In order to move the movable member 5 forward from the fixed 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 operation portion 80 is rotated upward, and the engaging portion 71 provided with the buffer member 73 is pushed upward.
Thereby, since the engaging part 71 is separated from the tooth 60a of the engaged part 10, the lock of the movement of the movable member 5 in the front-rear direction by the lock member 11 can be released.

Then, the movable side member 5 is moved in a direction away from the fixed side member 4 while maintaining the state where 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 lower shaft S of the inner link 6 and the lower shaft S of the outer link 7 move upward along the accommodating recesses 36c of the plurality of support portions 26, 36 below.

  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 and returns to the original position, and the plurality of teeth 60a. Will mesh with either. As a result, as shown in FIG. 15, the movable member 5 can be moved in a direction away from the fixed member 4 and 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 member 5 is moved either forward or backward without operating the button 9, the engaging portion 71 enters the nearest valley, and the movable member 5 can be locked. it can.

Similarly, when the movable side member 5 is returned to the rear side, first, the button 9 is pushed in, the buffer member 73 is operated, and the lock by the engaging portion 71 is released.
Thereafter, the movable 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 or the like moves 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 becomes 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. 14 is located below the left and right headrest pillars 2 and 2. When the button 9 is not operated, the engaging portion of the vertical lock member is in a state of being engaged with one notch 15 on the lower side of the headrest pillar 2, and the left and right pillar holding portions 4a, 4b in the vertical direction. Movement 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, the rotary operation member 13 is rotated to the X link mechanism side by pressing the button 9. . Along with this, the second operation portion 81 is rotated to the X link mechanism side, the vertical lock member is pushed into the back side of the lock holding portion 27, and the engaging portion (not shown) is moved to the back side of the lock holding portion 27. And move.
As a result, the engaging portion of the vertical lock member is separated from the notch 15 of the headrest pillar 2, so that the vertical movement of the left and right pillar holding portions 4a and 4b by the engaging portion of the vertical lock member is unlocked. Can do.

Then, the fixed side member 4 is moved upward along the left and right headrest pillars 2 and 2 while maintaining the state where the engaging portion of the upper and lower lock members is moved to the back side of the lock holding portion 27.
At this time, the movable member 5, the X link mechanism, and the like move upward as the fixed 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 members returns to the original position by the urging force of the urging member (not shown), and the one notch 15 on the upper side of the headrest pillar 2 Will be engaged. Accordingly, as shown in FIG. 15, 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 members may come into contact with the outer peripheral surface of the headrest pillar 2 located between the notches 15 and 15 adjacent to each other 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 is engaged with the nearest notch 15, and the left and right pillar holding portions are held. The parts 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 pressed to operate the second operation portion 81 to release the lock by the engaging portion of the upper and lower lock members.
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 side 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 the present embodiment, in the fixed side member 4 and the movable side member 5, the first movement restricting means 100 and the second movement restricting means 110 move the shaft S in the axial direction (mainly in the insertion direction). Can be effectively suppressed. As a result, the inner link 6 and the outer link 7 can be stably supported by the plurality of support portions 25 and 35.

Further, since the shaft S can be guided to the through hole 35b by the guide portion 101, the assembling property of the shaft S to the support portion 35 can be improved. Furthermore, since the restricting portion 104 is integrally formed on the support portion 35 side of the guide portion 101, it is possible to restrict the movement of the shaft S in the axial direction immediately after the shaft S is inserted into the through hole 35b. it can.
Therefore, it is possible to suitably respond to a request to restrict the movement of the shaft S in the axial direction while improving the assembling property of the shaft S to the support portion 35.

Moreover, since the position facing the shaft S in the restricting portion 104 is arranged away from the support portion 35, the guide portion 101 that is integral with the restricting portion 104 and has elasticity is provided on the shaft S. It becomes easy to deform at the time of guidance. Accordingly, the shaft S can be easily guided by the guide unit 101, and immediately after the shaft S passes through the guide unit 101, the movement of the shaft S in the axial direction can be regulated by the regulating unit 104.
Therefore, it is possible to appropriately respond to a request to restrict the movement of the shaft S in the axial direction by the restricting portion 104 while making it easy to guide the shaft S by the guide portion 101.

Moreover, the shaft S can be easily guided toward the through hole 35b only by moving the shaft S along the first guide wall 102 and the second guide wall 103. In addition, since the guide portion 101 is integrally formed with the movable side member 5 at a position where the shaft S is sandwiched among the movable side members 5, it is not necessary to prepare another member in order to form the guide portion 101. The number of parts can be reduced.
Therefore, the shaft S can be easily guided toward the through-hole 35b, and it is possible to suitably cope with a demand for reducing the number of parts.

Moreover, since the protrusion part 102a, 103a which protrudes in the shaft S side is provided in each of the edge part by the side of the support part 35 among the 1st guide wall 102 and the 2nd guide wall 103, at the time of guidance of the shaft S When the shaft S passes through the protrusions 102a and 103a, the first guide wall 102 and the second guide wall 103 are more easily deformed.
Therefore, it is possible to suitably respond to a request for making it easy to deform the first guide wall 102 and the second guide wall 103.

Moreover, the escape which avoids interference with the 1st guide wall 102 and the 2nd guide wall 103, and the stationary-side member 4 in the position which avoided the edge part by the side of the support part 35 among the 1st guide wall 102 and the 2nd guide wall 103. Since the portions 102b and 103b are provided, it is possible to contribute to downsizing of the headrest 1 while suppressing interference between the first guide wall 102 and the second guide wall 103 and the stationary member 4. Further, since the portions other than the escape portions 102b and 103b of the first guide wall 102 and the second guide wall 103 protrude, when the shaft S passes through the protruded portion, The second guide wall 103 is more easily deformed.
Therefore, it is possible to contribute to the downsizing of the headrest 1 while suppressing the interference between the first guide wall 102 and the second guide wall 103 and the stationary member 4, and further, the first guide wall 102 and the second guide wall 103 are It is possible to appropriately respond to a request for easy deformation.

Further, the movement of the shaft S in the axial direction after being inserted into the through hole 25c of the support portion 25 can be restricted by the restriction protrusion 111, and the peripheral portion of the insertion hole 25b on the fixed side member 4 side. Can be suppressed.
Therefore, it is possible to restrict the movement of the shaft S in the axial direction after being inserted into the through hole 25c of the support portion 25, and to suppress a decrease in rigidity of the peripheral portion of the insertion hole 25b on the fixed side member 4 side. It can respond suitably to a request.

The elastic restricting projection 111 is deformed when the shaft S is inserted to facilitate the insertion of the shaft S, and is elastically restored after the shaft S is inserted into the through hole 25c of the shaft S, so that the shaft S Can be restricted from moving in the axial direction.
Therefore, the shaft S can be easily inserted into the through hole 25c of the support portion 25, and the request for restricting the movement of the shaft S in the axial direction can be suitably met.

In addition, since the opening 112 is formed at a position facing the regulating protrusion 111 in the fixed side member 4, the assembled state of the shaft S can be confirmed from the opening 112.
Therefore, it is possible to suitably respond to a request to confirm the assembled state of the shaft S.

DESCRIPTION OF SYMBOLS 1 Headrest 2 Headrest pillar 4 Fixed side member 4a, 4b Pillar holding | maintenance part 4f Upper side contact part 5 Movable side member 6 First link (inner link)
6b Through hole 7 Second link (outer link)
7b Through hole 8a, 8b, 8c Through hole 10 Engaged part 11 Lock member 25 Support part 25a, 25b Insert hole 25c Through hole 25d Insert hole 26 Support part 30 Front cover 30a Front wall part 30b Peripheral wall part 31 Rear cover 35 Support portion 35a Insertion hole 35b Through hole 35c Insertion hole 36 Support portion 36a Insertion hole 36b Through hole 36c Housing recess 36d Positioning portion 37a Lower contact portion 37b Upper rail portion 42 Connection portion 51 Insertion hole 52 Connection portion 60 First protrusion 60a A plurality of teeth 61 A second protrusion 62 A gap 71 An engagement part 73 A buffer member 100 A first movement restricting means 101 A guide part 102 A first guide wall 102a A protrusion part 102b A relief part 103 A second guide wall 103a A protrusion part 103b A relief part 104 Restricting part 110 Second movement restricting means 111 Restricting projection 112 Opening 120 Third movement restricting means 121 Elastic extension part 121a Curved part 122 Guide part 122a Guide surface 123 Restriction part S Shaft

Claims (9)

A fixed side member provided on the headrest pillar;
A movable side member whose position can be adjusted in the front-rear direction with respect to the fixed side member;
A link mechanism having a plurality of links connecting the fixed side member and the movable side member, and
The fixed side member and the movable side member have a plurality of support parts that rotatably support the plurality of links via a shaft,
The shaft is inserted into through holes formed in the links and the support portions adjacent to each other in the width direction among the plurality of links and the plurality of support portions,
At least one of the fixed side member and the movable side member is provided with movement restriction means for restricting movement of the shaft in the axial direction ,
The movement restricting means provided on the movable side member is located on the insertion side of the shaft,
The movement restriction means is
A guide portion for guiding the shaft to the through hole when the shaft is inserted into the through hole;
A headrest comprising: a restricting portion that is integrally formed on the support portion side of the guide portion and restricts movement of the shaft in the axial direction after being inserted into the through hole . The guide part has elasticity, is deformed when guiding the shaft, and elastically returns after passing the shaft,
Headrest according to claim 1, wherein said shaft opposed to the position of the regulating unit, characterized in that it is spaced apart from the support portion. The guide portion is formed integrally with the movable side member at a position sandwiching the shaft among the movable side members, and faces the C shape so that the interval gradually decreases in the insertion direction of the shaft. The headrest according to claim 1 , wherein the headrest has first and second guide walls arranged in a row. Of each of the first guide wall and the second guide wall, each of the end portions on the support portion side is provided with a protruding portion that protrudes toward the shaft side,
The headrest according to claim 3 , wherein the protrusion functions as a movement restricting portion that restricts movement of the shaft in the axial direction . An escape portion that avoids interference between the first guide wall and the second guide wall and the fixed-side member at a position avoiding the end portion on the support portion side of the first guide wall and the second guide wall. headrest according to claim 3 or 4, characterized in that are provided. The fixed side member is formed to penetrate at a position facing the support portion, and has an insertion hole for inserting the shaft.
The movement restricting means provided on the fixed side member is located on the insertion side of the shaft,
The movement restricting means includes a restricting protrusion that is formed to project from the peripheral portion of the insertion hole toward the through hole and restricts the movement of the shaft in the axial direction after being inserted into the through hole. headrest according to any one of claims 1 to 5, characterized in that. A fixed side member provided on the headrest pillar;
A movable side member whose position is adjustable in the front-rear direction with respect to the fixed side member;
A link mechanism having a plurality of links connecting the fixed side member and the movable side member, and
The fixed side member and the movable side member have a plurality of support parts that rotatably support the plurality of links via a shaft,
The shaft is inserted into through holes formed in the links and the support portions adjacent to each other in the width direction among the plurality of links and the plurality of support portions,
At least one of the fixed side member and the movable side member is provided with movement restriction means for restricting movement of the shaft in the axial direction,
The fixed side member is formed to penetrate at a position facing the support portion, and has an insertion hole for inserting the shaft.
The movement restricting means provided on the fixed side member is located on the insertion side of the shaft,
The movement restricting means includes a restricting protrusion that is formed so as to protrude from the peripheral portion of the insertion hole toward the through hole and restricts movement of the shaft in the axial direction after being inserted into the through hole. features and be Ruhe Ddoresuto that.   8. The restriction projecting portion has elasticity, and is disposed so that a tip portion thereof faces a central portion of the shaft after being inserted into the through hole. Headrest.   9. The headrest according to claim 7, wherein an opening is formed at a position of the fixed member facing the restricting protrusion.

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