Headrest and vehicle seat

Abstract

To obtain a headrest which enables a headrest body to move to a predetermined position even if a space in the headrest body is small and inhibits a head of an occupant from moving rearward and supports the head of the occupant during rear-end collision of the vehicle, and to obtain a vehicular seat.SOLUTION: A headrest 14 is divided into a headrest front part 24 and a headrest rear part 26 and the headrest front part 24 and the headrest rear part 26 are allowed to move to an occupant head side separately. The structure allows the headrest front part 24 and the headrest rear part 26 to move separately so as to form different moving trajectories and thereby allows the headrest 14 to move to a predetermined position with a simple structure.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a headrest and a vehicle seat. [Background technology]

[0002] The following Patent Document 1 discloses technology related to an active headrest. In this prior art, when an occupant presses the seatback in a rear-end collision of the vehicle (hereinafter referred to as a "vehicle rear-end collision"), an operating cable arranged inside the seatback is pulled, which pushes up a rod inserted inside a stay of a frame member of the headrest, unlocking the locking mechanism.

[0003] In this prior art, when the lock is released, the connecting arm rotates around the axis of the pin, causing the support plate that can receive the back of the occupant's head to be held in a state in which it protrudes forward from its integral state with the base member, and the support plate can be held in a position close to the back of the occupant's head. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-247736 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in general, headrests provided on the rear seat side are smaller than headrests provided on the front seat side, and therefore, when attempting to apply the above-mentioned prior art to a rear seat headrest, it is difficult to apply the technology to the rear seat headrest due to the limited space within the headrest.

[0006] In consideration of the above, the present invention aims to provide a headrest and a vehicle seat that can move the headrest body to a predetermined position even if the space inside the headrest body is small, and that can prevent the occupant's head from moving backward and support the occupant's head during a rear-end collision of the vehicle. [Means for solving the problem]

[0007] The headrest according to the invention of claim 1 comprises: a headrest main body that is provided above a seat back of a vehicle seat and supports the head of an occupant seated on a seat cushion; headrest stays that are framework members of the headrest main body and are formed integrally with the headrest main body, the headrest stays being exposed from the headrest main body, arranged side by side in the seat width direction, and having a pair of legs attached to an upper end of the seat back; the headrest main body being divided into front and rear parts in the seat front-rear direction, the headrest front part constituting a front part of the headrest main body in the seat front-rear direction and against which the occupant's head can come into contact; a headrest rear part that is arranged rearward of the headrest front part in the seat front-rear direction and constituting a rear part of the headrest main body in the seat front-rear direction and supported by the headrest stays; and a movement mechanism that moves the headrest front part and the headrest rear part by a predetermined amount toward the occupant's head when a large load is input to the seat back toward the rear in the seat front-rear direction. The movement mechanism includes a first movement mechanism that moves the front portion of the headrest and the rear portion of the headrest when the large load is input, and a second movement mechanism that moves the front portion of the headrest relative to the rear portion of the headrest when the large load is input. .

[0008] The headrest according to the invention of claim 1 comprises a headrest main body and a headrest stay. The headrest main body is provided above the seat back of a vehicle seat and supports the head of an occupant seated on the seat cushion. Meanwhile, the headrest stay is a framework member of the headrest main body and is provided integrally with the headrest main body. The headrest stay also comprises a pair of legs that are exposed from the headrest main body, arranged side by side in the seat width direction, and attached to the upper end of the seat back.

[0009] In addition, in the present invention, the headrest main body is divided into front and rear portions in the seat front-rear direction and includes a headrest front portion, a headrest rear portion, and a movement mechanism. The headrest front portion constitutes the front portion of the headrest main body in the seat front-rear direction and is capable of being contacted by the head of an occupant seated on the seat cushion. Meanwhile, the headrest rear portion is located rearward of the headrest front portion in the seat front-rear direction and constitutes the rear portion of the headrest main body in the seat front-rear direction and is supported by the headrest stay. Furthermore, the movement mechanism moves the headrest front portion and the headrest rear portion by a predetermined amount toward the occupant's head when a large load is input to the seat back toward the rear side in the seat front-rear direction.

[0010] As described above, in the present invention, the headrest body (headrest) is divided into a front portion and a rear portion, and the front portion and the rear portion of the headrest are each movable toward the occupant's head, so that the front portion and the rear portion of the headrest can each move so as to trace different movement trajectories.

[0011] Therefore, compared to a case where one headrest is moved toward the head of the occupant, the present invention makes it possible to move the headrest to a predetermined position with a simple mechanism. Therefore, even if the internal space of the headrest is small, the present invention makes it possible to move the headrest to a predetermined position, prevent the occupant's head from moving backward, and support the occupant's head in the event of a rear-end collision.

[0013] In addition, in the present invention, The movement mechanism includes a first movement mechanism and a second movement mechanism. The first movement mechanism moves the front and rear portions of the headrest when a large load is applied, and the second movement mechanism moves the front portion of the headrest relative to the rear portion of the headrest when a large load is applied.

[0014] In this way, in the present invention, by moving the headrest using two separate mechanisms, it is possible to increase the degree of freedom of movement of the headrest compared to when the headrest is moved using a single mechanism.

[0015] Claim 2 The headrest according to the invention described in claim 1 In the headrest according to the invention described above, the moving mechanism is configured such that, when the large load is input, the first moving mechanism moves the front and rear portions of the headrest, and the second moving mechanism moves the front portion of the headrest relative to the rear portion of the headrest.

[0016] Claim 2 In the headrest according to the invention described in the above, when a large load is input, the first moving mechanism moves the front portion and the rear portion of the headrest toward the head of the occupant. The second moving mechanism moves the front portion of the headrest relative to the rear portion of the headrest toward the head of the occupant.

[0017] Claim 3 The headrest according to the invention described in claim 1 or claims 2 In the headrest according to the invention described above, the moving mechanism is provided on the headrest stay and includes a retaining bracket that holds the front and rear portions of the headrest, the first moving mechanism is provided on the retaining bracket and includes a first shaft portion that is arranged along the seat width direction and serves as the rotation center of the front and rear portions of the headrest, and the second moving mechanism is provided on the retaining bracket and includes a second shaft portion that is arranged along the seat width direction and serves as the rotation center of the front portion of the headrest.

[0018] Claim 3In the headrest according to the invention described in (1), the movement mechanism includes a retaining bracket. The retaining bracket is attached to the headrest stay and holds the front and rear portions of the headrest. By including the retaining brackets that hold the front and rear portions of the headrest, it is possible to ensure the rigidity of the headrest body itself even if the headrest body is separated.

[0019] Here, the first movement mechanism includes a first shaft portion provided on the holding bracket. The first shaft portion is arranged along the seat width direction, and the front and rear portions of the headrest rotate around the first shaft portion. The second movement mechanism includes a second shaft portion provided on the holding bracket. The second shaft portion is arranged along the seat width direction, and the front portion of the headrest rotates around the second shaft portion.

[0020] Claim 4 The headrest according to the invention described in claim 3 In the headrest according to the invention described in the above, the first movement mechanism further includes a first locking section that locks the front and rear portions of the headrest in an initial position and is released from the locked state when the heavy load is input, and a first biasing member that biases the front and rear portions of the headrest around the first axis in a direction to move them toward the head of the occupant, and the second movement mechanism further includes a second locking section that locks the front and rear portions of the headrest in an integrated state and is released from the locked state when the heavy load is input, and a second biasing member that biases the front portion of the headrest relative to the rear portion of the headrest in a direction to move them toward the head of the occupant around the second axis.

[0021] Claim 4 In the headrest according to the invention described above, the first moving mechanism is configured to further include a first locking portion and a first biasing member, and the second moving mechanism is configured to further include a second locking portion and a second biasing member.

[0022] The first locking portion locks the front and rear portions of the headrest in an initial position and is released from the locked state when a large load is applied. The first biasing member biases the front and rear portions of the headrest around the first shaft in a direction that moves them toward the occupant's head. Therefore, when the locked state by the first locking portion is released, the biasing force of the first biasing member moves the front and rear portions of the headrest around the first shaft toward the occupant's head.

[0023] The second locking portion locks the front and rear portions of the headrest together, and is released from the locked state when a large load is applied. The second biasing member biases the front portion of the headrest relative to the rear portion of the headrest around the second shaft in a direction that moves the front portion of the headrest toward the occupant's head. Therefore, when the locked state by the second locking portion is released, the biasing force of the second biasing member moves the front portion of the headrest relative to the rear portion of the headrest around the second shaft toward the occupant's head.

[0024] Furthermore, in the present invention, a first biasing member and a second biasing member such as a spring or rubber are used as means for moving the front and rear portions of the headrest toward the occupant's head. As a result, unlike a moving means such as a gear, after the front and rear portions of the headrest have moved toward the occupant's head, the front and rear portions of the headrest can be returned to their initial positions by pressing the front and rear portions of the headrest toward the rear in the seat front-rear direction against the biasing forces of the first and second biasing members.

[0025] Claim 5 The headrest according to the invention described in claim 4In the headrest according to the invention described above, the movement mechanism further includes a first operation cable having one end connected to the first locking portion, a second operation cable having one end connected to the second locking portion, and a receiving member provided on the seat back, having the other end connected to the first operation cable and the other end connected to the second operation cable, and applying tension to the first operation cable and the second operation cable when the large load is input.

[0026] Claim 5 In the headrest according to the invention described above, the movement mechanism further includes a first operation cable, a second operation cable, and a receiving member. One end of the first operation cable is connected to a first locking portion, and the other end of the first operation cable is connected to the receiving portion. Furthermore, one end of the second operation cable is connected to a second locking portion, and the other end of the second operation cable is connected to the receiving portion. Here, the receiving portion applies tension to the first operation cable and the second operation cable when a large load is input. This allows the locked state by the first locking portion and the second locking portion to be released.

[0027] Claim 6 The headrest according to the invention described in claim 5 In the headrest according to the invention described above, instead of the first operating cable and the second operating cable, one end of a third operating cable is connected to the first locking portion and the second locking portion, and the other end of the third operating cable is connected to the receiving member.

[0028] Claim 6 In the headrest according to the invention described in (1), a third operation cable is used instead of the first operation cable and the second operation cable. One end of this third operation cable is connected to the first locking portion and the second locking portion, and the other end of the third operation cable is connected to the receiving member. By using a single third operation cable in this way as both the first operation cable and the second operation cable, costs can be reduced accordingly.

[0029] Claim 7 The headrest according to the invention described in claim 4 ~Claims 6 In the headrest described in any one of the above, the first moving mechanism further includes a first stopper that restricts movement of the front and rear portions of the headrest against the biasing force of the first biasing member, and the second moving mechanism further includes a second stopper that restricts movement of the front portion of the headrest against the biasing force of the second biasing member.

[0030] Claim 7 In the headrest according to the invention described above, the first movement mechanism further includes a first stopper, and the second movement mechanism further includes a second stopper. The first stopper restricts movement of the front and rear portions of the headrest against the biasing force of the first biasing member. The second stopper restricts movement of the front portion of the headrest against the biasing force of the second biasing member. As a result, in this invention, the front portion of the headrest is maintained in a position after moving toward the occupant's head, and the occupant's head is supported by the front portion of the headrest.

[0031] Claim 8 The headrest according to the invention described in claim 7 In the headrest described in the above, the first stopper prevents the headrest front and rear from moving. A restriction release member is provided for releasing the restriction and releasing the movement restriction at the front portion of the headrest by the second stopper.

[0032] Claim 8The headrest according to the invention described in is provided with a restriction release member that releases the restriction on movement of the front and rear portions of the headrest imposed by the first stopper, and that releases the restriction on movement of the front portion of the headrest imposed by the second stopper. As described above, after the front portion of the headrest moves toward the head of the occupant, that position is maintained and the occupant's head is supported by the front portion of the headrest. However, if the front portion of the headrest is configured to be locked in this state, it becomes necessary to release the locked state of the front portion of the headrest using the restriction release member.

[0033] Here, in the present invention, as described above, a first biasing member and a second biasing member such as a spring or rubber are used as a means for moving the front and rear portions of the headrest toward the occupant's head, and the restriction release member releases the restriction on movement of the front and rear portions of the headrest imposed by the first stopper and the second stopper, and then the front portion of the headrest is pressed toward the rear in the fore-and-aft direction of the seat against the biasing force of the first and second biasing members, thereby making it possible to return the front and rear portions of the headrest to their initial positions.

[0034] Claim 9 The headrest according to the invention described in claim 3 ~Claims 8 In the headrest described in any one of the above, the headrest main body is generally inverted L-shaped when viewed from the left side, the first axis portion is provided at the rear side of the rear of the headrest in the seat front-rear direction, and the second axis portion is provided at the lower end of the front of the headrest in the seat up-down direction.

[0035] Claim 9 In the headrest according to the invention described above, the headrest body is generally inverted L-shaped when viewed from the left side, with the first axis portion provided at the rear side of the headrest in the front-to-rear direction of the seat, and the second axis portion provided at the lower end of the front part of the headrest in the up-and-down direction of the seat.

[0036] That is, the headrest main body rotates at the front and rear portions around the rear side of the headrest rear, and the front portion of the headrest rotates relative to the rear portion of the headrest around the lower end of the front portion of the headrest.

[0037] Here, if the front and rear portions of the headrest are rotated around the rear side of the headrest rear, and then the front portion of the headrest is rotated relative to the rear portion of the headrest around the lower end of the front portion of the headrest, the upper end of the front portion of the headrest will move in a direction (toward the front of the seat) that opposes the direction in which the seated occupant's head will move due to inertia toward the rear of the seat during a rear collision of the vehicle. This makes it possible to more reliably prevent the occupant's head from moving backward.

[0038] Claim 10 The vehicle seat according to the invention described above includes a seat cushion on which an occupant sits, a seat back that supports the upper body of the occupant seated on the seat cushion, and a seat cushion disposed above the seat back, 9 and a headrest according to any one of the above.

[0039] Claim 10 In the vehicle seat according to the invention described above, when a large load is input to the seat back toward the rear in the fore-and-aft direction of the seat in the headrest disposed above the seat back that supports the upper body of an occupant seated on the seat cushion, the front and rear portions of the headrest move toward the head of the occupant. [Effects of the Invention]

[0040] As described above, with the headrest and vehicle seat of the present invention, even if the space inside the headrest body is small, the headrest body can be moved to a predetermined position, and the head of the occupant can be prevented from moving backward during a rear-end collision of the vehicle and the occupant's head can be supported. [Brief explanation of the drawings]

[0041] [Figure 1]FIG. 2 is a perspective view showing the configuration of a headrest and a rear seat according to the embodiment, as viewed from the diagonally front left side. [Figure 2] FIG. 2 is a perspective view showing the internal configuration of the headrest according to the embodiment, as viewed from the diagonally front left side. [Figure 3] FIG. 2 is a partially exploded perspective view showing an enlarged view of a portion of the internal configuration of the headrest according to the embodiment. [Figure 4] FIG. 4 is a plan view corresponding to FIG. 3. [Figure 5] FIG. 10 is a partially exploded perspective view showing an enlarged view of another portion of the internal configuration of the headrest according to the embodiment. [Figure 6] FIG. 6 is a front view corresponding to FIG. 5. [Figure 7] FIG. 2 is a side view showing an initial position of the headrest according to the embodiment. [Figure 8] 10 is a side view showing a state in which the headrest front portion and the headrest rear portion of the headrest according to the embodiment have been moved. FIG. [Figure 9] 10 is a side view showing a state in which the headrest front portion of the headrest according to the embodiment has moved relative to the headrest rear portion. FIG. [Figure 10] 10 is a side view showing a state in which the headrest front portion and the headrest rear portion of the headrest according to the embodiment have been moved. FIG. [Figure 11] FIG. 3 is a perspective view corresponding to FIG. 2 and showing a first modification of the internal configuration of the headrest according to the present embodiment. [Figure 12] 12(A) and 12(B) are cross-sectional views showing the main part of FIG. 11. [Figure 13] FIG. 10 is a perspective view corresponding to FIG. 2, showing a second modification of the internal configuration of the headrest according to the present embodiment. [Figure 14] 14(A) and 14(B) are cross-sectional views showing the main part of FIG. 13. DETAILED DESCRIPTION OF THE INVENTION

[0042] A vehicle seat using a headrest according to an embodiment of the present invention will be described below with reference to the drawings. Note that the arrows FR, UP, and RH shown in each drawing indicate the front, top, and right of the vehicle seat, respectively. Hereinafter, when the front, back, left, right, top, and bottom directions are used in the description, they will indicate directions relative to the vehicle seat unless otherwise specified. Also, in each drawing, some symbols may be omitted to make the drawings easier to read.

[0043] (Vehicle seat configuration) First, the configuration of the vehicle seat according to this embodiment will be described.

[0044] As shown in Fig. 1, a vehicle seat 10 according to this embodiment is, for example, a so-called rear seat provided on the rear side. The vehicle seat 10 includes a seat cushion (not shown) that supports the buttocks and thighs of a seated occupant, and a seat back 12 that supports the back of the seated occupant, with the lower end of the seat back 12 connected to the rear end of the seat cushion. Furthermore, a headrest (headrest main body) 14 that supports the head of the seated occupant is provided at the upper end of the seat back 12. The lower end of the seat back 12 may be directly connected to the vehicle floor.

[0045] On the other hand, the headrest 14 includes a headrest stay 19 which is a framework member, a headrest pad 20 which is a padding material, and a cover 21 which covers the headrest pad 20.

[0046] The headrest stay 19 is made of, for example, a metal pipe material and has a pair of left and right legs 16, 18, with a connecting member 22 (see FIG. 2) spanning the upper ends of the legs 16, 18. The headrest pad 20 is made of, for example, a foam such as urethane foam.

[0047] In this embodiment, the headrest 14 is a so-called saddle type, has a generally inverted L-shape when viewed from the left side, and is divided into a headrest front portion 24 and a headrest rear portion 26 in the seat front-rear direction. Therefore, in this embodiment, the headrest pad 20 is provided with headrest pads 20A and 20B corresponding to the headrest front portion 24 and the headrest rear portion 26, respectively. Furthermore, the cover 21 is provided with cover layers 21A and 21B corresponding to the headrest pads 20A and 20B, respectively.

[0048] Although not shown, the cover may be of a type that covers the headrest pad 20A and the headrest pad 20B. However, in this embodiment, as will be described later, since the headrest pad 20A moves relative to the headrest pad 20B, it is necessary to take into consideration the movement of the headrest pad 20A, for example, by forming the cover in an accordion shape.

[0049] The headrest front portion 24 of the headrest 14 has a generally rectangular shape with its longitudinal direction aligned with the up-down direction of the seat, and the headrest rear portion 26 of the headrest 14 has a generally rectangular shape with its longitudinal direction aligned with the front-rear direction of the seat. As shown in Fig. 7, when the headrest 14 is in its initial position, the back surface 24A1 of the upper end portion 24A of the headrest front portion 24 abuts against the front end 26A of the headrest rear portion 26. The upper end portion of the headrest stay 19 is embedded in the headrest rear portion 26.

[0050] As shown in Fig. 2, plate-shaped support plates 28, 30 that protrude toward the front of the seat are joined to the outer peripheral surfaces of the upper ends of the legs 16, 18 of the headrest stay 19. Holes 28A, 30A that penetrate along the seat width direction are formed at the tips of the support plates 28, 30, respectively, and a bolt shaft (first shaft portion) 32 is inserted into the holes 28A, 30A. The bolt shaft 32 is fixed to the support plates 28, 30 via a nut 34. The bolt shaft 32 is fixed to the support plates 28, 30 in a state where it is prevented from rotating.

[0051] A plate-shaped bracket (movement mechanism) 36 is attached to the bolt shaft 32. The bracket 36 has a generally inverted L-shape in a left side view, and includes a front wall portion 38 that is formed along the seat up-down direction and the seat width direction and has a generally rectangular shape in a front view with the seat up-down direction as its longitudinal direction, an upper wall portion 40 that is formed along the seat front-rear direction and the seat width direction and has a generally rectangular shape in a plan view with the seat width direction as its longitudinal direction, and an arc-shaped connecting portion 42 that connects the front wall portion 38 and the upper wall portion 40 and bulges forward. The headrest front portion 24 is supported on the front wall portion 38 side of the bracket 36, and the headrest rear portion 26 is supported on the upper wall portion 40 side of the bracket 36.

[0052] At the rear end 40A of the upper wall portion 40 of the bracket 36, support plates 44, 46 are respectively erected from the outer edge in the seat width direction of the bracket 36. Holes 44A, 46A penetrating along the seat width direction are formed at the tip ends of the support plates 44, 46, respectively, and the bolt shaft 32 is inserted into the holes 44A, 46A. The bracket 36 is rotatable around the bolt shaft 32.

[0053] Torsion springs (first biasing members) 48 are fitted onto the left and right sides of the bolt shaft 32 in the axial direction, with one end of each torsion spring 48 attached to the connecting member 22 and the other end of each torsion spring 48 attached to the bracket 36. The state shown in FIG. 2 is the initial state of the headrest 14 (see FIG. 7), and in this state, energy is stored in the torsion spring 48 that biases the bracket 36 in a direction that rotates it in the direction of arrow A.

[0054] 2 to 4, a support plate 50 is joined to the outer peripheral surface of the connecting member 22 at the axial center of the connecting member 22. The support plate 50 is disposed parallel to the support plates 28 and 30, and a hole 50A is formed at the tip of the support plate 50, penetrating along the seat width direction. The bolt shaft 32 is inserted through this hole 50A. The tip of the support plate 50 is also formed with a notch (first locking portion) 52 that is cut out toward the rear of the seat.

[0055] Here, a pivotal support plate 54 is provided upright on the upper wall portion 40 of the bracket 36, and is arranged along the seat front-rear direction. A hole 54A is formed in the pivotal support plate 54 along the seat width direction, and a shaft 54A is fixed to the hole 54A. The lower end of an engaging member 56, which is arranged along the seat front-rear direction and the seat up-down direction, is pivotally supported by the shaft 54A, and an engaging portion (first locking portion) 58 is formed at the upper end of the engaging member 56. This engaging portion 58 is engageable with a notch 52 formed in the support plate 50.

[0056] In addition, a torsion spring (not shown) is attached to the shaft 54A, which urges the engaging member 56 in the direction of arrow A, preventing the locked state between the engaging portion 58 and the notch portion 52 from being easily released.

[0057] On the other hand, with the engaging portion 58 engaged with the notch portion 52, the bracket 36 is maintained in its initial position, and when the engaging portion 58 rotates and the engagement with the notch portion 52 is released, the bracket 36 rotates in the direction of arrow A due to the biasing force of the torsion spring 48.

[0058] A cylindrical boss 60 is erected on the upper wall portion 40 of the bracket 36, and a rotating member 62 having a pair of wings 62A, 62B extending radially from the boss 60 is provided at the tip of the boss 60, and the rotating member 62 is rotatable around the boss 60. One end 64A of an engagement pin 64 is connected to the wings 62B, and the other end of the engagement pin 64 is connected to the engagement member 56.

[0059] Therefore, when the rotating member 62 rotates in the direction of arrow B, the engaging member 56 rotates in the direction opposite to the direction of arrow A via the engaging pin 64 connected to the wing portion 62B. This releases the state in which the engaging portion 58 formed on the engaging member 56 is engaged with the notch portion 52 formed in the support plate 50.

[0060] Stoppers (first stoppers) 66, 68 that protrude inward in the seat width direction are formed at the front ends of the support plates 28, 30, respectively, and the upper wall portion 40 of the bracket 36 can abut against the stoppers 66, 68. When the engagement state of the engaging portion 58 with the notch portion 52 formed in the support plate 50 is released and the bracket 36 rotates in the direction of arrow A due to the biasing force of the torsion spring 48, the upper wall portion 40 of the bracket 36 abuts against the stoppers 66, 68, thereby restricting the movement of the bracket 36.

[0061] 2 and 5, support plates 70 and 72 each protrude toward the front of the seat from the outer edge of the bracket 36 in the seat width direction at the lower end 38A of the front wall portion 38 of the bracket 36. Holes 70A and 72A that penetrate along the seat width direction are formed at the tip ends of the support plates 70 and 72, respectively.

[0062] In addition, on the outer side of the support plates 70, 72 in the seat width direction, both end portions 74A, 74B of an arm 74 that is approximately inverted U-shaped and has an opening on the lower side are arranged, and both end portions 74A, 74B of the arm 74 are formed with hole portions 74A1, 74B1, respectively.

[0063] A bolt shaft (second shaft portion) 76 is inserted through the holes 70A, 72A of the support plates 70, 72 and the holes 74A1, 74B1 of the arm 74, and is fixed via a nut 78. The arm 74 is rotatable around the bolt shaft 76. A mounting plate 80 is bridged across the arm 74 on the front wall portion 38 side of the bracket 36 in the seat width direction.

[0064] Torsion springs (second biasing members) 82 are fitted on the left and right sides of the bolt shaft 76, with one end of each torsion spring 82 attached to the front wall portion 38 side of the bracket 36 and the other end of each torsion spring 82 attached to the mounting plate 80. The spring constant of the torsion springs 82 is smaller than the spring constant of the torsion spring 48.

[0065] The state shown in Figure 2 is the initial state of the headrest 14 (see Figure 7), and in this state, energy is stored in the torsion spring 82 that urges the mounting plate 80 in a direction that rotates it in the direction of arrow C.

[0066] 2, 5, and 6, a support plate 84 is joined to the front wall portion 38 of the bracket 36 between the support plates 70 and 72 and arranged parallel to the support plates 70 and 72. A hole 84A is formed at the tip of the support plate 84, penetrating along the seat width direction. The bolt shaft 76 is inserted into this hole 84A. The tip of the support plate 84 is also formed with a notch (second locking portion) 86 that is cut out toward the rear of the seat.

[0067] Here, a pivotal support plate 88 arranged along the seat front-rear direction is erected at the center in the seat width direction and at the lower end 80A of the mounting plate 80. A hole 88A is formed in the pivotal support plate 88 along the seat width direction, and a shaft 88B is fixed to the hole 88A.

[0068] A pivoting member 90 is disposed along the seat front-rear direction and the seat up-down direction, and a central portion of the pivoting member 90 in the seat up-down direction is pivotally supported by the shaft 88B. An engaging portion (second locking portion) 92 is formed on a lower portion 90A of the pivoting member 90. The engaging portion 92 is engageable with a notch 86 formed in the support plate 84.

[0069] A torsion spring is attached to the shaft 88B, and urges the rotating member 90 in the direction of arrow C, preventing the locking state between the engaging portion 92 and the notch portion 86 from being easily released. The torsion spring used has approximately the same spring constant as the torsion spring attached to the shaft 54A of the pivot support plate 54.

[0070] On the other hand, with the engaging portion 92 engaged with the notch portion 86, the bracket 36 is maintained in its initial position, and when the engaging portion 92 rotates and the engagement with the notch portion 86 is released, the arm 74 rotates in the direction of arrow C due to the biasing force of the torsion spring 82.

[0071] A connection piece 94 projects toward the front of the seat from the center and upper end in the seat width direction of the mounting plate 80 provided on the arm 74. One end of an engagement pin 96 is connected to this connection piece 94. The other end of the engagement pin 96 is connected to an upper part 90B of the rotating member 90. Therefore, when the rotating member 90 rotates in the direction of arrow D, an engagement portion 92 formed on a lower part 90A of the rotating member 90 is disengaged from a notch 86 formed in the support plate 84.

[0072] Meanwhile, stoppers (second stoppers) 98, 100 that protrude inward in the seat width direction are formed at the front ends of the support plates 70, 72, respectively, and both end portions 74A, 74B of the arm 74 can abut against the stoppers 98, 100. When the engagement state of the engaging portion 92 with the notch portion 86 formed in the support plate 84 is released and the arm 74 rotates in the direction of arrow C due to the biasing force of the torsion spring 82, both end portions 74A, 74B of the arm 74 abut against the stoppers 98, 100, thereby restricting the movement of the arm 74.

[0073] 1, a rectangular plate-shaped receiving member 102 is built into the center of the seat back 12. This receiving member 102 is configured to move toward the rear of the seat when a large load is input from a seated occupant who inertially moves toward the rear of the seat during a rear-end collision of the vehicle. One end of an operation cable (second operation cable) 104 and one end of an operation cable (first operation cable) 106 are connected to the upper end of the receiving member 102.

[0074] Therefore, when the receiving member 102 moves toward the rear side of the seat, the operation cables 104, 106 are each pulled (tension is applied) via the receiving member 102. As described above, the headrest stay 19 is formed of a pipe material and is hollow. Therefore, the operation cable 104 is routed inside the leg portion 16 of the headrest stay 19, and the operation cable 106 is routed inside the leg portion 18 of the headrest stay 19.

[0075] In addition, the other end of the operating cable 106 is connected to the wing portion 62A of the pivoting member 62 provided on the upper wall portion 40 of the bracket 36, and the other end of the operating cable 104 is connected to the upper portion 90B of the pivoting member 90 provided on the front wall portion 38 of the bracket 36 via a connecting piece 94 and a pin 96 provided on the mounting plate 80.

[0076] On the operating cable 106 side, if the distance between the connection portion 62A1 with the wing portion 62A of the rotating member 62 and the axis of the boss 60, which is the rotation center of the rotating member 62, is L, the distance between the connection portion 62B1 between one end 64A of the engaging pin 64 and the wing portion 62B of the rotating member 62 and the axis of the boss 60 is set to be approximately L.

[0077] Furthermore, on the operating cable 104 side, the distance between the connection portion 90B1 between the pin 96 and the upper portion 90B of the rotating member 90 and the axis of the shaft 88B, which is the rotation center of the rotating member 90, is approximately L, and the distance between the engagement portion 92 formed on the lower portion 90A of the rotating member 90 and the axis of the shaft 88B is also set to be approximately L.

[0078] In other words, in this embodiment, the distance between the connection portion 62A1 of the wing portion 62A and the axis of the boss 60, the distance between the connection portion 62B1 of the wing portion 62B and the axis of the boss 60, the distance between the connection portion 90B1 of the rotating member 90 and the axis of the shaft 88B, and the distance between the engagement portion 92 of the rotating member 90 and the axis of the shaft 88B are set to be approximately the same.

[0079] Furthermore, in this embodiment, the tension from the operation cables 104, 106 is transmitted to the wing portions 62A of the rotating member 62 and the upper portion 90B of the rotating member 90 at approximately the same time. That is, in this embodiment, when the tension from the operation cables 104, 106 is transmitted to the wing portions 62A of the rotating member 62 and the upper portion 90B of the rotating member 90, the engaging portion 58 of the engaging member 56 and the engaging portion 92 of the rotating member 90 are moved (so-called disengagement) at approximately the same time.

[0080] (Actions and Effects of Vehicle Seats) Next, the operation and effects of the vehicle seat according to this embodiment will be described.

[0081] As shown in FIG. 7, in this embodiment, the headrest 14 is divided into front and rear parts in the seat front-rear direction, and includes a headrest front part 24, a headrest rear part 26, and a movement mechanism 35.

[0082] The headrest front portion 24 constitutes the front portion of the headrest 14 in the seat front-rear direction and is capable of contacting the head of an occupant seated on the seat cushion. On the other hand, the headrest rear portion 26 is positioned rearward of the headrest front portion 24 in the seat front-rear direction, constitutes the rear portion of the headrest 14 in the seat front-rear direction, and is supported by the headrest stay 19.

[0083] Also, as shown in Figure 2, when a large load is input to the seat back 12 toward the rear in the seat fore-and-aft direction, the moving mechanism 35 moves the headrest front portion 24 and the headrest rear portion 26 a predetermined amount toward the occupant's head, as shown in Figure 10.

[0084] As described above, in this embodiment, the headrest 14 is divided into the headrest front portion 24 and the headrest rear portion 26, and the headrest front portion 24 and the headrest rear portion 26 are each made movable toward the occupant's head, so that the headrest front portion 24 and the headrest rear portion 26 can each move so as to trace different movement trajectories, as shown in Figures 7 to 9.

[0085] Therefore, although not shown in the figures, in comparison with a comparative example in which one headrest is moved toward the head of the occupant, in this embodiment, it is possible to move the headrest 14 to a predetermined position with a simple mechanism.

[0086] Therefore, in this embodiment, even if the space inside the headrest 14 is small, the headrest 14 can be moved to a predetermined position, preventing the occupant's head from moving backward during a rear-end collision and supporting the occupant's head. As a result, this embodiment can reduce whiplash injuries and contribute to improving occupant protection performance.

[0087] 2, the movement mechanism 35 includes a movement mechanism 35A and a movement mechanism 35B. In this embodiment, when a large load is input to the seat back 12 toward the rear in the seat front-rear direction, the movement mechanism 35A moves the headrest front portion 24 and the headrest rear portion 26 as shown in FIG. 8, and at approximately the same time, the movement mechanism 35B moves the headrest front portion 24 relative to the headrest rear portion 26 as shown in FIG. 9.

[0088] In other words, in this embodiment, when a large load is input to the seat back 12 toward the rear in the seat fore-and-aft direction, the movement of the headrest front portion 24 and the headrest rear portion 26 by the moving mechanism 35A and the movement of the headrest front portion 24 by the moving mechanism 35B occur approximately simultaneously.

[0089] 7 to 9, as an example, the movements of the headrest front portion 24 and the headrest rear portion 26 are described in the order shown in Figures 7 to 9. However, as described above, the movements of the headrest front portion 24 and the headrest rear portion 26 by the movement mechanism 35A and the movement of the headrest front portion 24 by the movement mechanism 35B are performed approximately simultaneously, and therefore the operations shown in Figures 8 and 9 are performed approximately simultaneously. Therefore, in this embodiment, the headrest front portion 24 and the headrest rear portion 26 move from the state shown in Figure 7 to the state shown in Figure 10.

[0090] In this embodiment, the headrest front portion 24 and the headrest rear portion 26 are moved by the movement mechanism 35A, and the headrest front portion 24 is moved by the movement mechanism 35B. That is, in this embodiment, two shafts (bolt shaft 32, bolt shaft 76) are provided, and the headrest 14 is moved via these shafts, thereby enabling the headrest 14 to move with greater freedom of movement compared to when the headrest 14 is moved via a single shaft.

[0091] 2 and 7, the movement mechanism 35 includes a bracket 36, which is attached to the headrest stay 19 and holds the headrest front portion 24 and the headrest rear portion 26. By including the bracket 36 that holds the headrest front portion 24 and the headrest rear portion 26 in this way, it is possible to ensure the rigidity of the headrest 14 itself even when the headrest 14 is divided.

[0092] The movement mechanism 35A, which constitutes a part of the movement mechanism 35, includes a bolt shaft 32 provided on the bracket 36. The bolt shaft 32 is arranged along the seat width direction, and the headrest front portion 24 and the headrest rear portion 26 rotate around the bolt shaft 32.

[0093] On the other hand, the movement mechanism 35B, which constitutes the other part of the movement mechanism 35, is configured to include a bolt shaft 76 provided on the bracket 36. The bolt shaft 76 is arranged along the seat width direction, and the headrest front portion 24 rotates around the bolt shaft 76.

[0094] In this embodiment, the movement mechanism 35A further includes a notch 52 and an engagement portion 58 as a first locking portion, and a torsion spring 48. On the other hand, the movement mechanism 35B further includes a notch 86 and an engagement portion 92 as a second locking portion, and a torsion spring 82.

[0095] Furthermore, in this embodiment, the movement mechanism 35 is configured to further include an operation cable 106, an operation cable 104, and a receiving member 102. One end of the operation cable 106 is connected to the wing portion 62A of the rotating member 62, and the other end of the operation cable 106 is connected to the receiving member 102. Furthermore, one end of the operation cable 104 is connected to the upper portion 90B of the rotating member 90, and the other end of the operation cable 104 is connected to the receiving member 102.

[0096] Here, when a large load is input to the seat back 12 toward the rear in the seat front-rear direction, the receiving member 102 applies tension (pulls) to the operation cables 106 and 104 substantially simultaneously. This causes the engaging member 56 serving as the first locking portion to rotate in the direction opposite to the direction of arrow A, thereby releasing the state in which the engaging portion 58 formed on the engaging member 56 is engaged with the notch 52 formed on the support plate 50. At substantially the same time, the rotating member 90 serving as the second locking portion is rotated in the direction of arrow D, thereby releasing the state in which the engaging portion 92 formed on the rotating member 90 is engaged with the notch 86 formed on the support plate 84.

[0097] In the moving mechanism 35A, the torsion spring 48 biases the headrest front portion 24 and the headrest rear portion 26 in a direction that moves them toward the occupant's head around the bolt shaft 32, so when the locking state by the notch portion 52 and the engagement portion 58 is released, the biasing force of the torsion spring 48 moves the headrest front portion 24 and the headrest rear portion 26 toward the occupant's head around the bolt shaft 32.

[0098] Furthermore, in the moving mechanism 35B, the torsion spring 82 biases the headrest front portion 24 relative to the headrest rear portion 26 toward the occupant's head, centered on the bolt shaft 76. Therefore, when the locking state by the notch portion 86 and the engagement portion 92 is released, the biasing force of the torsion spring 82 moves the headrest front portion 24 relative to the headrest rear portion 26 toward the occupant's head, centered on the bolt shaft 76.

[0099] Furthermore, in this embodiment, movement mechanism 35A is configured to further include stoppers 66, 68, and movement mechanism 35B is configured to further include stoppers 98, 100. Therefore, the upper wall portion 40 of bracket 36 abuts against the stoppers 66, 68 against the biasing force of torsion spring 48, thereby restricting movement of headrest front portion 24 and headrest rear portion 26. Furthermore, the opposite ends 74A, 74B of arm 74 abut against stoppers 98, 100 against the biasing force of torsion spring 82, thereby restricting movement of headrest front portion 24.

[0100] In this way, by restricting the movement of the headrest front part 24, the headrest front part 24 is maintained in a position after moving toward the occupant's head, and the occupant's head is supported by the headrest front part 24.

[0101] As described above, in this embodiment, the torsion springs 48 and 82 are used as means for moving the headrest front portion 24 and the headrest rear portion 26 toward the head of the occupant. As a result, in this embodiment, when the headrest front portion 24 and the headrest rear portion 26 have moved toward the head of the occupant, the headrest front portion 24 can be pressed toward the rear of the seat against the biasing forces of the torsion springs 48 and 82, thereby returning the headrest front portion 24 and the headrest rear portion 26 to their initial positions.

[0102] In this embodiment, the headrest 14 is roughly inverted L-shaped when viewed from the left side, and the bolt shaft 32 is provided on the rear portion 26B side of the headrest rear portion 26 in the seat front-to-back direction, and the bolt shaft 76 is provided on the lower end portion 24B of the headrest front portion 24 in the seat up-down direction.

[0103] That is, the headrest 14 rotates around the rear portion 26B of the headrest rear portion 26, with the headrest front portion 24 and the headrest rear portion 26 rotating around the lower end portion 24B of the headrest front portion 24 relative to the headrest rear portion 26.

[0104] In this way, by rotating the headrest front portion 24 about the lower end portion 24B of the headrest front portion 24 relative to the headrest rear portion 26, the stroke of the upper end portion 24A of the headrest front portion 24 can be made longer compared to when the headrest front portion 24 is rotated about the center of the headrest front portion 24, although this is not shown in the figures. This increases the amount of movement of the upper end portion 24A of the headrest front portion 24, and allows the headrest 14 to be moved to a predetermined position even if the space inside the headrest 14 is small.

[0105] In this embodiment, as described above, when a large load is input to the seat back 12 toward the rear in the seat fore-and-aft direction, the headrest front portion 24 and the headrest rear portion 26 are moved by the moving mechanism 35A, and the headrest front portion 24 is moved relative to the headrest rear portion 26 by the moving mechanism 35B.

[0106] That is, in this embodiment, the movement of the headrest front portion 24 and the headrest rear portion 26 by the moving mechanism 35A and the movement of the headrest front portion 24 by the moving mechanism 35B are performed approximately simultaneously. However, "approximately simultaneously" here does not have to be completely simultaneous, and it is sufficient that the headrest front portion 24 can be moved to a predetermined position within a preset time, and the movement of the headrest front portion 24 and the headrest rear portion 26 by the moving mechanism 35A and the movement of the headrest front portion 24 by the moving mechanism 35B may be earlier or later than each other within a predetermined tolerance range.

[0107] <Other variations> (Variation 1)

[0108] In the above embodiment, as shown in FIG. 2, stoppers 66, 68 that restrict the movement of bracket 36 are provided at the front ends of support plates 28, 30, and stoppers 98, 100 that restrict the movement of arm 74 are provided at the front ends of support plates 70, 72, respectively. However, the stoppers that restrict the movement of bracket 36 and arm 74 are not limited to these.

[0109] 11, 12(A) and 12(B), a separate notch 110 may be formed on the support plate 50 with which the engaging portion 58 engages, on the vehicle rear side of the notch 52 in the direction in which the biasing force of the torsion spring 48 acts, and the movement of the bracket 36 may be restricted by the engaging portion 58 engaging with the notch 110. Note that the support plate 50 is formed with a protrusion 112 with which the engaging portion 58 abuts, on the vehicle rear side of the notch 110.

[0110] Furthermore, a separate notch 114 may be formed on the support plate 84 with which the engaging portion 92 engages, below the notch 86, along the direction in which the biasing force of the torsion spring 82 acts, and the movement of the arm 74 may be restricted by the engaging portion 92 engaging with the notch 114. As with the support plate 50, the support plate 84 is formed with a protrusion 116 on the vehicle rear side of the notch 114, with which the engaging portion 92 abuts.

[0111] In this embodiment, when the engaging portion 58 is engaged with the notch 110 and the engaging portion 92 is engaged with the notch 114, the movement of the bracket 36 and the arm 74 is restricted.

[0112] In this embodiment, when the headrest front portion 24 and the headrest rear portion 26 have moved toward the occupant's head, the engagement portion 58 is engaged with the notch 110, and the engagement portion 92 is engaged with the notch 114. Therefore, to return the headrest front portion 24 and the headrest rear portion 26 to their initial positions from this state, it is necessary to release the engagement of the engagement portion 58 with the notch 110 and the engagement of the engagement portion 92 with the notch 114.

[0113] Therefore, in this embodiment, a knob (restriction release member) 118 is provided for releasing this engaged state. Specifically, for example, in the initial positions of the headrest front portion 24 and the headrest rear portion 26, a wing portion 62C is formed on the upper wall portion 40 of the bracket 36 between the wing portions 62A and 62B of the turning member 62 provided on the boss 60 and on the front side. A clamping portion 120 is provided on the upper surface of this wing portion 62C, and is capable of clamping a wire 122, which will be described later.

[0114] Furthermore, a support piece 124 is erected on the upper wall portion 40 of the bracket 36 on the front side of the support plate 44, and a knob 118 is supported on the support piece 124 so as to be movable along the seat width direction. This knob 118 can be exposed to the outside of the skin 21, and the wire 122 is connected to the knob 118. A support piece 126 is erected on the upper wall portion 40 of the bracket 36 on the opposite side of the support piece 124, with the clamping portion 120 therebetween, and the wire 122 is supported so as to be at approximately the same height as the clamping portion 120.

[0115] Meanwhile, a support piece 128 protrudes from the mounting plate 80 toward the front of the seat adjacent to the connection piece 94 (note that the connection piece 94 may also be used). The support piece 128 supports the wire 122 and is connected to one end of an engagement pin 130. The other end of this engagement pin 130 is connected to the upper portion 90B of the rotating member 90.

[0116] In this state, when the knob 118 is pulled outward in the seat width direction (in the direction of arrow E), the rotating member 62 rotates in the direction of arrow B via the wire 122, the clamping portion 120, and the wing portion 62C, and the rotating member 90 rotates in the direction of arrow D via the engagement pin 130.

[0117] This releases the state in which the engagement portion 58 formed on the engagement member 56 is engaged with the notch portion 110 formed on the support plate 50, and also releases the state in which the engagement portion 92 formed on the pivoting member 90 is engaged with the notch portion 114 formed on the support plate 84.

[0118] In this state, the headrest front portion 24 and the headrest rear portion 26 can be returned to their initial positions by pressing the headrest front portion 24 toward the rear of the seat against the biasing forces of the torsion springs 48 and 82.

[0119] (Variation 2)

[0120] In the above embodiment, as shown in FIG. 2, operation cables 104 and 106 are used, and operation cable 104 releases the state in which engagement portion 92 is engaged with notch portion 86, and operation cable 106 releases the state in which engagement portion 58 is engaged with notch portion 52, but this is not limited to this.

[0121] For example, as shown in Figures 13 and 14, a single operating cable (third operating cable) 132 rotates the engaging member 56 and the rotating member 90 approximately simultaneously, releasing the state in which the engaging portion 58 is engaged with the notch portion 52 and releasing the state in which the engaging portion 92 is engaged with the notch portion 86.

[0122] For this reason, the operation cable 132 is connected to the wing 62A and support piece 94 of the rotating member 62 that rotates the engaging member 56. Here, a clamping portion 134 that grips the operation cable 132 is provided on the upper surface of the wing 62A. Furthermore, support pieces 136 and 138 are erected on the upper wall portion 40 of the bracket 36 with the clamping portion 134 between them, so that the operation cable 132 is supported at the same height as the clamping portion 120.

[0123] As a result, when tension is applied to the operating cable 132, the engaging member 56 and the rotating member 90 rotate approximately simultaneously, and the state in which the engaging portion 58 is engaged with the notch portion 52 is released, and the state in which the engaging portion 92 is engaged with the notch portion 86 is released.

[0124] 13 and 14 are illustrated as modified examples corresponding to FIG. 2, in which slack is generated in the operation cable 132 to avoid interference with other components, but in this embodiment, although not illustrated, the operation cable 132 is routed so as not to generate slack.

[0125] Furthermore, the present invention can be implemented in various modifications without departing from the spirit and scope of the present invention, and it goes without saying that the scope of the present invention is not limited to the above-described embodiments. [Explanation of symbols]

[0126] 10 Vehicle seats 12 Seat back 14 Headrest 16 Legs 18 Legs 19 Headrest stay 20 Headrest Pad 20A Headrest Pad 24 Front of headrest 26 Rear of headrest 32 Bolt shaft (first shaft, first moving mechanism) 35 Moving mechanism 35A Moving mechanism (1st moving mechanism, moving mechanism) 35B Moving mechanism (second moving mechanism, moving mechanism) 36 Bracket (holding bracket, moving mechanism) 48 Torsion spring (first biasing member, first moving mechanism) 52 Notch portion (first lock portion, first moving mechanism) 58 Engagement portion (first lock portion, first movement mechanism) 66 Stopper (first stopper) 68 Stopper (first stopper) 76 Bolt shaft (second shaft, second moving mechanism) 82 torsion spring (second biasing member, second moving mechanism) 86 Notch (second locking part, second moving mechanism) 92 Engagement portion (second lock portion, second movement mechanism) 98 Stopper (second stopper) 100 Stopper (second stopper) 102 Receiving member 104 Operation cable (second operation cable) 106 Operation cable (first operation cable) 110 Notch (first stopper) 114 Notch (second stopper) 118 Knob (restriction release member) 132 Operation cable (third operation cable)

Claims

1. a headrest body provided above a seat back of a vehicle seat and configured to support the head of an occupant seated on a seat cushion; a headrest stay that is a framework member of the headrest body, is provided integrally with the headrest body, is exposed from the headrest body, is arranged side by side in the seat width direction, and is attached to an upper end of the seat back; and Equipped with The headrest body is divided into front and rear parts in the front-rear direction of the seat, a headrest front portion that forms a front portion of the headrest main body in the seat front-rear direction and against which the occupant's head can come into contact; a headrest rear portion that is disposed rearward of the headrest front portion in the seat front-rear direction, that constitutes a rear portion of the headrest main body in the seat front-rear direction, and that is supported by the headrest stay; a movement mechanism that moves the headrest front portion and the headrest rear portion toward the head of the occupant by a predetermined amount when a large load is input to the seat back toward a rear side in a seat front-rear direction; Equipped with The moving mechanism includes: a first moving mechanism that moves the front portion of the headrest and the rear portion of the headrest when the large load is input; a second moving mechanism that moves the headrest front portion relative to the headrest rear portion when the large load is input; A headrest comprising:

2. The moving mechanism includes:

2. The headrest according to claim 1, wherein when the large load is input, the first moving mechanism moves the front portion of the headrest and the rear portion of the headrest, and the second moving mechanism moves the front portion of the headrest relative to the rear portion of the headrest.

3. the moving mechanism includes a holding bracket that is provided on the headrest stay and holds the front portion of the headrest and the rear portion of the headrest, The first moving mechanism is a first shaft portion provided on the retaining bracket, arranged along the seat width direction, and serving as a rotation center of the headrest front portion and the headrest rear portion; The second movement mechanism is 3. The headrest according to claim 1, further comprising a second shaft portion provided on the retaining bracket, arranged along the seat width direction, and serving as a rotation center for the front portion of the headrest.

4. The first moving mechanism is a first locking portion that locks the front portion of the headrest and the rear portion of the headrest at an initial position and that is released from the locked state when the large load is input; a first biasing member that biases the headrest front portion and the headrest rear portion in a direction to move them toward the head of the occupant around the first shaft portion; and further comprising: The second movement mechanism is The front portion of the headrest and the rear portion of the headrest are locked together in an integrated state, a second locking portion that is released from a locked state when a large load is input; a second biasing member that biases the headrest front portion relative to the headrest rear portion around the second shaft portion in a direction that moves the headrest front portion toward the head of the occupant; The headrest of claim 3 further comprising:

5. The moving mechanism comprises: a first operating cable having one end connected to the first lock portion; a second operating cable having one end connected to the second lock portion; a receiving member provided on the seat back, the receiving member having the other end of the first operation cable and the other end of the second operation cable connected thereto, and applying tension to the first operation cable and the second operation cable when the large load is input; The headrest of claim 4 further comprising:

6. A headrest as described in Claim 5, wherein, instead of the first operating cable and the second operating cable, one end of a third operating cable is connected to the first locking portion and the second locking portion, and the other end of the third operating cable is connected to the receiving member.

7. The first moving mechanism is a first stopper that restricts movement of the headrest front portion and the headrest rear portion against the biasing force of the first biasing member; The second movement mechanism is The headrest according to any one of claims 4 to 6, further comprising a second stopper that restricts movement of the front portion of the headrest against the biasing force of the second biasing member.

8. A headrest as described in claim 7, which is provided with a restriction release member that releases the movement restriction at the front and rear of the headrest caused by the first stopper, and that releases the movement restriction at the front of the headrest caused by the second stopper.

9. The headrest body is approximately inverted L-shaped when viewed from the left side, the first shaft portion is provided on a rear side of the headrest rear portion in the seat front-rear direction, The headrest according to any one of claims 3 to 8, wherein the second shaft portion is provided at a lower end portion of the front portion of the headrest in the seat up-down direction.

10. A seat cushion on which an occupant sits; a seat back that supports the upper body of an occupant seated on the seat cushion; a headrest according to any one of claims 1 to 9, which is disposed above the seat back; A vehicle seat comprising:

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