Vehicle seats

Abstract

To enable position adjustment of a neck-rest in a vehicle seat.SOLUTION: A vehicle seat 1 has: a seat cushion 3; a seat back lower part 5 which is rotatably provided at a rear part of the seat cushion; a seat back upper part 6 which is rotatably provided at an upper end of the seat back lower part; and a headrest 7 which is provided at an upper end of the seat back upper part so as to move vertically. The headrest has: a headrest body part 71 facing a rear head part of an occupant; and a neck-rest part 72 which protrudes forward and downward from a front lower part of the headrest body part and faces a neck of the occupant.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat with a neck rest. [Background technology]

[0002] Some vehicle seats have a neck rest attached to the headrest to support the neck of the occupant (for example, Patent Document 1). The neck rest is positioned so as to protrude forward and downward from the headrest, and is located behind the neck of the occupant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-334055 Summary of the Invention [Problem to be solved by the invention]

[0004] Since the neck restraint comes into contact with the occupant, it is necessary to adjust its position appropriately according to the occupant's body shape, posture, and seatback inclination. However, the headrest can only move up and down relative to the seatback. neck rest However, if a neck rest is provided, the adjustment direction is limited to one direction only, and the neck rest cannot be positioned appropriately.

[0005] SUMMARY OF THE INVENTION In view of the above background, an object of the present invention is to provide a vehicle seat that allows adjustment of the neck rest position. [Means for solving the problem]

[0006] In order to solve the above problems, one aspect of the present invention provides a vehicle seat having a seat cushion (3), a lower seat back (5) rotatably mounted on the rear of the seat cushion, an upper seat back (6) rotatably mounted on the upper end of the lower seat back, and a headrest (7) movably mounted on the upper end of the upper seat back, the headrest having a headrest main body (71) facing the back of the occupant's head, and a neck rest (72) protruding forward and downward from the lower front part of the headrest main body and facing the occupant's neck.

[0007] According to this aspect, the headrest with the neck rest portion is provided on the upper part of the seat back, which is rotatable relative to the lower part of the seat back, so that the neck rest portion can be moved forward and backward by rotating the upper part of the seat back. This widens the range of position adjustment for the neck rest portion, allowing the neck rest portion to be positioned in a comfortable position for the occupant.

[0008] In the above invention, the headrest has a headrest pillar (62) extending from the headrest main body, and the upper part of the seat back has a cylindrical pillar support member (59) that supports the headrest pillar, and a headrest drive device (17) that engages with the tip of the headrest pillar protruding from the pillar support member and moves the headrest pillar in the axial direction, and preferably further has a control device (21) that drives the headrest drive device in response to a signal from an operation input device.

[0009] According to this aspect, the headrest can be moved relative to the upper part of the seat back by operating the operation input device.

[0010] In the above invention, the lower part of the seat back may have a lower part of the seat back drive device (15) that rotates the lower part of the seat back relative to the seat cushion, and the control device may drive the lower part of the seat back drive device in response to a signal from the operation input device, and when the control device rotates the lower part of the seat back rearward using the lower part of the seat back drive device, the control device may lower the headrest using the headrest drive device in accordance with the amount of rotation of the lower part of the seat back.

[0011] According to this aspect, the position of the neck rest can be automatically adjusted when the lower part of the seatback rotates rearward. When the lower part of the seatback rotates rearward, the head of the occupant leaning against the seatback moves downward relative to the upper part of the seatback. Therefore, by lowering the headrest, the neck rest can be moved to an appropriate position corresponding to the occupant's neck.

[0012] In addition, in the above invention, when the control device rotates the lower part of the seat back forward using the lower seat back drive device, it is preferable that the control device raises the headrest using the headrest drive device in accordance with the amount of rotation of the lower part of the seat back.

[0013] According to this aspect, the position of the neck rest can be automatically adjusted when the lower part of the seatback rotates forward. When the lower part of the seatback rotates forward, the head of the occupant leaning against the seatback moves upward relative to the upper part of the seatback. Therefore, by raising the headrest, the neck rest can be moved to an appropriate position corresponding to the occupant's neck.

[0014] In the above invention, the front lower or upper seat back may have a seat back upper drive device (16) that rotates the upper seat back relative to the lower seat back, and the control device may drive the seat back upper drive device in response to a signal from the operation input device, and when the control device rotates the upper seat back forward using the seat back upper drive device, the control device may raise the headrest using the headrest drive device in accordance with the amount of rotation of the upper seat back.

[0015] According to this aspect, the position of the neck rest can be automatically adjusted when the upper part of the seatback rotates forward. When the upper part of the seatback rotates forward, the head of the occupant leaning against the seatback moves upward relative to the upper part of the seatback. Therefore, by raising the headrest, the neck rest can be moved to an appropriate position corresponding to the occupant's neck.

[0016] In addition, in the above invention, when the control device rotates the upper part of the seat back rearward using the upper seat back drive device, it is preferable that the control device lowers the headrest using the headrest drive device in accordance with the amount of rotation of the upper part of the seat back.

[0017] According to this aspect, the position of the neck rest can be automatically adjusted when the upper part of the seatback rotates rearward. When the upper part of the seatback rotates rearward, the head of the occupant leaning against the seatback moves downward relative to the upper part of the seatback. Therefore, by lowering the headrest, the neck rest can be moved to an appropriate position corresponding to the occupant's neck.

[0018] In addition, in the above invention, the lower part of the seat back has a pair of left and right first side members (46) extending vertically and pivotally connected at their lower ends to the rear part of the seat cushion, and a first cross member (47) extending horizontally and connected at both left and right ends to the upper ends of the first side members, respectively; the upper part of the seat back has a pair of left and right second side members (51) extending vertically and pivotally connected at their lower ends to the first side members, respectively, and a second cross member (53) extending horizontally and connected at both left and right ends to the upper ends of the second side members, respectively; and the seat back upper drive device is preferably provided on the inner left or right surface of one of the second side members.

[0019] According to this aspect, the seat back upper part drive device can be efficiently disposed inside the upper part of the seat back.

[0020] In addition, in the above invention, at least one of the first side members may be provided with a pin (56) protruding inward to the left or right, and the second side member may be formed with a slot (55) that receives the pin and has a predetermined length in the circumferential direction around the pivot axis of the second side member relative to the second side member.

[0021] According to this aspect, the rotation range of the upper part of the seat back relative to the lower part of the seat back can be determined by the contact between the pin and the end of the slot.

[0022] In the above invention, the neck rest portion may have a shape in which both sides bulge forward from the center.

[0023] According to this aspect, the neck rest portion can be more closely fitted to the neck of the occupant, and the neck rest portion can stably support the neck of the occupant.

[0024] In the above invention, the neck rest portion may have airbags (73) on the left and right sides of the front portion for adjusting the amount of forward expansion.

[0025] According to this aspect, the neck rest portion can be more closely fitted to the neck of the occupant, and the neck rest portion can stably support the neck of the occupant. [Effects of the Invention]

[0026] According to the above aspect, the headrest with the neck rest portion is provided on the upper part of the seat back, which is rotatable relative to the lower part of the seat back, so that the neck rest portion can be moved forward and backward by rotating the upper part of the seat back. This widens the range of position adjustment for the neck rest portion, allowing the neck rest portion to be positioned in a comfortable position for the occupant.

[0027] According to an aspect in which the headrest driving device is provided, the headrest can be moved relative to the upper part of the seat back by operating the operation input device.

[0028] According to an embodiment in which the control device causes the headrest drive device to lower the headrest in accordance with the amount of rotation of the lower seatback when the lower seatback drive device rotates the lower seatback rearward, the neck rest portion can be automatically lowered when the lower seatback rotates rearward.

[0029] According to an aspect in which the control device causes the headrest to be raised by the headrest drive device in accordance with the amount of rotation of the lower seatback when the lower seatback is rotated forward by the lower seatback drive device, the neck rest portion can be automatically raised when the lower seatback is rotated forward.

[0030] According to an aspect in which the control device causes the headrest to be raised by the headrest drive device in accordance with the amount of rotation of the upper seatback when the upper seatback is rotated forward by the upper seatback drive device, the neck rest portion can be automatically raised when the upper seatback is rotated forward.

[0031] According to an aspect in which the control device causes the headrest drive device to lower the headrest in accordance with the amount of rotation of the upper seatback when the upper seatback drive device rotates the upper seatback rearward, the neck rest portion can be automatically lowered when the upper seatback rotates rearward.

[0032] According to an embodiment in which the seat back upper drive device is provided on the inner left or right surface of one of the first side members, the seat back upper drive device can be efficiently disposed inside the upper part of the seat back.

[0033] In an embodiment in which a pin protruding inward to the left or right is provided on at least one of the second side members and a slot for receiving the pin is formed in the first side member, the rotation range of the upper part of the seat back relative to the lower part of the seat back can be determined.

[0034] In an embodiment in which the neck rest portion has a shape in which the left and right sides bulge forward from the center, the fit between the neck rest portion and the occupant's neck is improved, and the neck rest portion can stably support the occupant's neck.

[0035] In an embodiment in which the neck rest portion has airbags on the left and right sides of the front portion to adjust the amount of forward expansion, the fit between the neck rest portion and the occupant's neck is improved, and the neck rest portion can stably support the occupant's neck. [Brief explanation of the drawings]

[0036] [Figure 1] FIG. 1 is a perspective view showing a vehicle seat in an upright position; [Figure 2] FIG. 1 is a perspective view showing a relaxed position of a vehicle seat; [Figure 3] FIG. 1 is a perspective view showing a frame of a vehicle seat; [Figure 4] FIG. 1 is a perspective view showing an upper frame of a seat back of a vehicle seat; [Figure 5] FIG. 1 is a side view of the left first back side member and the left second back side member, with the seat back upper drive device omitted, viewed from the left and right inner sides. [Figure 6] Headrest cross section DETAILED DESCRIPTION OF THE INVENTION

[0037] An embodiment of the present invention applied to an automobile seat will be described below with reference to the drawings. The seat may be a driver's seat, a passenger seat, or a rear seat. In the following description, left and right are defined based on the occupant seated in the seat. Identical components provided in a pair on the left and right sides are assigned common numbers and will not be described again.

[0038] As shown in Figures 1 and 2, the seat 1 has a seat cushion 3 provided on a floor 2 of a vehicle and a seat back 4 provided at the rear end of the seat cushion 3. The seat back 4 has a seat back lower portion 5 rotatably provided at the rear end of the seat cushion 3, and a seat back upper portion 6 rotatably provided at the seat back lower portion 5. The seat 1 also has a headrest 7 provided at the top end of the seat back upper portion 6 so as to be movable up and down, and an ottoman 8 rotatably provided at the front end of the seat cushion 3. The rotation axis of the seat back lower portion 5 relative to the seat cushion 3, the rotation axis of the seat back upper portion 6 relative to the seat back lower portion 5, and the rotation axis of the ottoman 8 relative to the seat cushion 3 all extend parallel to one another in the left-right direction.

[0039] A pair of left and right side covers 10 are provided on the left and right sides of the seat cushion 3. The upper rear ends of the left and right side covers 10 protrude upward and are located on the sides of the seat back lower part 5, forming armrests. A back cover 11 is provided at the rear of the seat back lower part 5. The upper part of the back cover 11 extends upward behind the seat back upper part 6.

[0040] A seat surface 13 formed by the upper surface of the seat cushion 3 can be tilted relative to the floor 2. The seat surface 13 of the seat cushion 3 can be tilted between an initial position in which it extends substantially horizontally and an inclined position in which the front end has moved upward relative to the initial position.

[0041] As shown in Figure 2, the seat 1 can assume a relaxed position in which the seat cushion 3 is tilted backward, the lower seat back 5 and the upper seat back 6 are tilted backward, and the ottoman 8 is deployed upward. The position of the seat 1 shown in Figure 1 is called the upright position.

[0042] The seat back lower portion 5 is provided with a seat back lower drive device 15 that rotates the seat back lower portion 5 relative to the seat cushion 3. The seat back upper portion 6 is provided with a seat back upper drive device 16 that rotates the seat back upper portion 6 relative to the seat back lower portion 5, and a headrest drive device 17 that moves the headrest 7 up and down relative to the seat back upper portion 6. The seat cushion 3 is provided with a seat cushion drive device 18 that tilts the seat surface 13 relative to the floor 2, and an ottoman drive device 19 that rotates the ottoman 8 relative to the seat cushion 3. The seat back lower drive device 15, the seat back upper drive device 16, the headrest drive device 17, the seat cushion drive device 18, and the ottoman drive device 19 each have an electric motor and a drive force transmission mechanism that transmits the drive force of the electric motor. The drive force transmission mechanism may include, for example, a reduction mechanism or a sector gear.

[0043] The seat back lower drive device 15, the seat back upper drive device 16, the headrest drive device 17, the seat cushion drive device 18, and the ottoman drive device 19 are driven by a control device 21. The control device 21 is an electronic control unit (ECU) equipped with a CPU, memory, an interface, etc. An operation input device 22 for receiving operation inputs from the occupant is connected to the control device 21. The control device 21 is preferably disposed below the seat cushion 3 or inside the side cover 10. The operation input device 22 is preferably provided on the upper surface of the side cover 10.

[0044] The operation input device 22 has switches for operating the rotation of the lower seat back 5, the rotation of the upper seat back 6, the up and down movement of the headrest 7, the tilt of the seat surface 13 of the seat cushion 3, and the rotation of the ottoman 8, as well as a relaxed posture switch for putting the seat 1 into a predetermined relaxed posture and an upright posture switch for putting the seat 1 into a predetermined upright posture.

[0045] As shown in Fig. 3, a seat frame 30 forming the framework of the seat 1 has a cushion frame 31 that constitutes the seat cushion 3, and a seat back lower frame 32 and a seat back upper frame 33 that constitute the seat back 4. The seat cushion 3 is formed by covering the cushion frame 31 with a pad and an upholstery material, and the seat back lower frame 5 and the seat back upper frame 6 are formed by covering the seat back lower frame 32 and the seat back upper frame 33 with a pad and an upholstery material. The pad is made of a resilient cushioning material such as polyurethane foam, and the upholstery material is made of synthetic leather, fabric, or the like.

[0046] The cushion frame 31 is connected to the vehicle floor 2 via a slide device 35. The slide device 35 has a plurality of slide rails, each including a rail and a slider movably supported on the rail. In this embodiment, the slide device 35 has a pair of left and right lower slide rails 36 extending in the front-rear direction, an intermediate frame 37 connected to the upper part of each lower slide rail 36, and a pair of front and rear upper slide rails 38 extending in the left-right direction and connected to the intermediate frame 37 at their lower parts.

[0047] The cushion frame 31 is formed in a frame shape and includes a pair of left and right cushion side members 40 that extend in the front-to-rear direction and are connected to the sliders of each upper slide rail 38, a front cross member 41 that spans between the front portions of the cushion side members 40, and a rear cross member 42 that spans between the rear portions of the cushion side members 40. The cushion frame 31 also includes a plate-shaped pan frame 43 that is rotatably supported on the left and right cushion side members 40. The pan frame 43 has its rear end rotatably supported on the intermediate portions of the left and right cushion side members 40 in the front-to-rear direction, and its front end is located above the front cross member 41.

[0048] A seat cushion drive device 18 is provided between the pan frame 43 and one of the cushion side members 40. The seat cushion drive device 18 changes the inclination angle of the seat surface 13 of the seat cushion 3 by moving the front end of the pan frame 43 up and down relative to the cushion side frame.

[0049] The seat back lower frame 32 has a pair of left and right first back side members 46 extending approximately vertically, a first upper cross member 47 suspended between the upper ends of the left and right first back side members 46, and a first lower cross member 48 suspended between the lower parts of the first back side members 46.

[0050] The lower ends of the left and right first back side members 46 extend downwardly beyond the first lower cross member 48 and are rotatably supported on the rear ends of the corresponding cushion side members 40. A seat back lower drive device 15 is provided on the right side (inner side in the left-right direction) of the lower end of the left first back side member 46. The seat back lower drive device 15 changes the angle of inclination of the seat back lower portion 5 relative to the seat cushion 3 by rotating the first back side member 46 relative to the cushion side member 40.

[0051] As shown in Figures 3 and 4, the upper back frame includes a pair of left and right second back side members 51 extending vertically, a second upper cross member 52 connecting the upper ends of the left and right second back side members 51, and a second middle cross member 53 spanning between the vertical middle portions of the left and right second back side members 51. Each second back side member 51 is formed from a plurality of sheet metal members, and its surfaces face left and right. The second upper cross member 52 is disposed forward of the first upper cross member 47.

[0052] The lower end of each second back side member 51 is rotatably coupled to a vertically intermediate portion of the corresponding first back side member 46. As shown in FIGS. 4 and 5 , a slot 55 is formed in the outer peripheral edge of the lower end of each second back side member 51, extending in the circumferential direction around the pivot axis of the second back side member 51 relative to the first back side member 46. The slot 55 is a groove recessed from the outer peripheral edge of the lower end of the second back side member 51 toward the pivot axis of the second back side member 51. Pins 56 protruding inward to the left and right are provided on the inner surface of each first back side member 46. Each pin 56 is received in the corresponding slot 55 and abuts against both circumferential ends of the slot 55, thereby restricting the pivot range of the upper back frame relative to the seat back lower frame 32.

[0053] 3 and 4, the seatback upper portion drive device 16 is provided on the inside (right side) of the lower end portion of the left-side second back side member 51. By arranging the seatback upper portion drive device 16 along the second back side member 51, the seatback upper portion drive device 16 can be efficiently disposed inside the seatback upper portion 6. The seatback upper portion drive device 16 changes the tilt angle of the seatback upper portion 6 relative to the seatback lower portion 5 by rotating the second back side member 51 relative to the first back side member 46.

[0054] A pair of left and right support brackets 58 are provided on the second upper cross member 52. Each support bracket 58 is cylindrical with open ends and is connected to the front surface of the second upper cross member 52 so as to extend vertically. A pillar support member 59 for supporting the headrest 7 is inserted inside each support bracket 58. The pillar support member 59 is made of resin and has a cylindrical shape that extends vertically.

[0055] 6, the headrest 7 has a headrest body 61 that forms the center of the headrest 7, a pair of left and right headrest pillars 62 connected to the headrest body 61, a headrest pad 63 that is provided to cover the headrest body 61, and a cover 64 that covers the headrest pad 63. The headrest body 61 has an upper body portion 65 that is connected to each headrest pillar 62 and extends laterally above the second upper cross member 52, and a lower body portion 66 that extends downward from the front lower edge of the upper body portion 65. The lower body portion 66 is formed in a plate shape, and its lower portion is located forward of the headrest pillars 62 and the upper seat back portion 6.

[0056] The headrest pad 63 has an upper pad portion 67 arranged to cover the front, upper, rear, left, and right sides of the upper body portion 65, and a lower pad portion 68 connected to the lower front portion of the upper pad portion 67 and arranged on the front side of the lower body portion 66. The lower pad portion 68 protrudes forward relative to the upper pad portion 67. A cross section of the lower pad portion 68 viewed in the left-right direction is formed in a semicircular shape that protrudes forward. Both ends of the lower pad portion 68 in the left-right direction bulge forward relative to the center portion. Similarly to the lower pad portion 68, both ends of the upper pad portion 67 in the left-right direction may also protrude forward relative to the center portion. The front-to-rear thickness of the lower pad portion 68 is preferably greater than the front-to-rear thickness of the front portion of the upper pad portion 67.

[0057] The upper body portion 65 and the upper pad portion 67 form the headrest main body portion 71, and the lower body portion 66 and the lower pad portion 68 form the neck rest portion 72. The headrest main body portion 71 faces the back of the occupant's head, and the neck rest portion 72 protrudes forward and downward from the lower front portion of the headrest main body portion 71 and faces the occupant's neck. The vertical width of the neck rest portion 72 is preferably greater than the vertical width of the headrest main body portion 71. The neck rest portion 72 has a shape in which the left and right sides bulge forward from the center. This improves the fit between the neck rest portion 72 and the occupant's neck, allowing the neck rest portion 72 to stably support the occupant's neck.

[0058] As shown in Figures 1 and 6, airbags 73 that inflate and deflate by supplying and discharging air are disposed inside the left and right sides of neck rest portion 72. Airbags 73 are connected to an air supply source via hoses (not shown). By adjusting the amount of air supplied to airbag 73, the amount of forward inflation of the left and right sides of the front of neck rest portion 72 can be adjusted. This further improves the fit between neck rest portion 72 and the occupant's neck, allowing neck rest portion 72 to stably support the occupant's neck.

[0059] 4, a pair of left and right headrest pillars 62 extend parallel to each other downward from their upper ends connected to the upper body portion 65 to the rear of the lower body portion 66. Each headrest pillar 62 is inserted downward into the corresponding pillar support member 59, with its lower end protruding below the pillar support member 59.

[0060] A headrest drive device 17 is provided inside the seat back upper portion 6. The headrest drive device 17 has a casing 75 that is a thin, flat, rectangular parallelepiped shaped casing extending from front to rear. The upper portion of the casing 75 is connected to the second upper cross member 52 by a bracket 76. The rear surface of the lower portion of the casing 75 is connected to an intermediate portion of a wire 77 that is hung between the left and right second back side members 51. When viewed from the front, the casing 75 is disposed below the second upper cross member 52 and between the left and right second back side members 51. When viewed from the front, the casing 75 is disposed between left and right imaginary lines that are extrapolated downward from the axes of the left and right pillar support members 59. When viewed from the front, the casing 75 is disposed above the second middle cross member 53.

[0061] The casing 75 is provided inside with an electric motor and a driving force transmission mechanism for transmitting the driving force of the electric motor. The driving force transmission mechanism has a pair of left and right output portions 82 that protrude outward to the left and right of the casing 75. The left and right output portions 82 are arranged on the axis of the corresponding pillar support members 59. An engagement hole 83 is formed in the upper part of each output portion 82, into which the tip (lower end) of the headrest pillar 62 is inserted and which engages with the tip of the headrest pillar 62. As the electric motor rotates, the output portion 82 moves up and down along the slit 81 and the axis of the headrest pillar 62. As a result, the headrest 7 including the neck rest portion 72 moves in the axial direction of the headrest pillar 62 relative to the seat back upper portion 6.

[0062] When rotating the seat back lower part 5 in response to a signal from the operation input device 22 instructing a change in the tilt angle of the seat back lower part 5, the control device 21 drives the seat back lower part drive device 15 to rotate the seat back lower part 5 relative to the seat cushion 3, and simultaneously drives the headrest drive device 17 to move the headrest 7 up and down. Specifically, in response to a signal from the operation input device 22 to rotate the seat back lower part 5 rearward, the control device 21 drives the seat back lower part drive device 15 to rotate the seat back lower part 5 rearward, and simultaneously drives the headrest drive device 17 to lower the headrest 7 in accordance with the amount of rotation of the seat back lower part 5. Furthermore, in response to a signal from the operation input device 22 to rotate the seat back lower part 5 forward, the control device 21 drives the seat back lower part drive device 15 to rotate the seat back lower part 5 forward, and simultaneously drives the headrest drive device 17 to raise the headrest 7 in accordance with the amount of rotation of the seat back lower part 5. The amount of lowering and raising of the headrest 7 is preferably proportional to the amount of rotation of the lower part 5 of the seat back backward and forward.

[0063] When rotating the seat back upper part 6 in response to a signal from the operation input device 22 instructing a change in the tilt angle of the seat back upper part 6, the control device 21 drives the seat back upper part drive device 16 to rotate the seat back upper part 6 relative to the seat back lower part 5, and simultaneously drives the headrest drive device 17 to move the headrest 7 up and down. Specifically, in response to a signal from the operation input device 22 to rotate the seat back upper part 6 rearward, the control device 21 drives the seat back upper part drive device 16 to rotate the seat back upper part 6 rearward, and simultaneously drives the headrest drive device 17 to lower the headrest 7 in accordance with the amount of rotation of the seat back upper part 6. Furthermore, in response to a signal from the operation input device 22 to rotate the seat back upper part 6 forward, the control device 21 drives the seat back upper part drive device 16 to rotate the seat back upper part 6 forward, and simultaneously drives the headrest drive device 17 to raise the headrest 7 in accordance with the amount of rotation of the seat back upper part 6. The amount of lowering and raising of the headrest 7 is preferably proportional to the amount of rotation of the upper part 6 of the seat back backward and forward.

[0064] The control device 21 drives only the headrest drive device 17 in response to a signal from the operation input device 22 instructing the headrest 7 to be lowered or raised relative to the seatback upper part 6. This allows the occupant to adjust only the position of the headrest 7 after, for example, rotating the seatback lower part 5 or the seatback upper part 6 forward or backward.

[0065] In the seat 1 configured as described above, the headrest 7 having the neck rest portion 72 is provided on the seat back upper portion 6, which is rotatable relative to the seat back lower portion 5, so that the neck rest portion 72 can be moved forward and backward by rotating the seat back upper portion 6. This widens the adjustment range of the neck rest portion 72, allowing the neck rest portion 72 to be positioned in a comfortable position for the occupant.

[0066] When the seat back lower part 5 is rotated forward and backward by the seat back lower drive device 15, the headrest drive device 17 lowers or raises the headrest 7 in accordance with the amount of rotation of the seat back lower part 5, so that the neck rest part 72 can be automatically positioned in an appropriate position when the seat back lower part 5 rotates. Similarly, when the seat back upper part 6 is rotated forward and backward by the seat back upper drive device 16, the headrest drive device 17 lowers or raises the headrest 7 in accordance with the amount of rotation of the seat back lower part 5, so that the neck rest part 72 can be automatically positioned in an appropriate position when the seat back upper part 6 rotates.

[0067] Although the specific embodiment has been described above, the present invention is not limited to the above embodiment and can be widely modified. For example, the seat back upper part drive device 16 may be provided in the seat back lower part 5 instead of the seat back upper part 6. [Explanation of symbols]

[0068] 1: Sheet 3: Seat cushion 4: Seat back 5: Lower part of seat back 6: Upper part of seat back 7: Headrest 15: Seat back lower drive unit 16: Seat back upper drive unit 17: Headrest drive device 18: Seat cushion drive device 21: Control device 22: Operation input device 32: Seat back lower frame 33: Seat back upper frame 43: Pan Frame 46: First backside member 47: First upper cross member 51: Second backside member 52: Second upper cross member 55: Slot 56: Pin 59: Pillar support member 62: Headrest pillar 71: Headrest body 72: Neckrest Club 73: Airbag

Claims

1. Seat cushion and a seat back rotatably provided at a rear portion of the seat cushion; a headrest provided at the upper end of the seat back so as to be movable up and down; The headrest includes a headrest main body portion facing the rear of the head of the occupant; a neck rest portion that protrudes forward and downward from a front lower portion of the headrest main body portion and faces the neck of an occupant, a lower end of the neck rest portion extending downwardly from an upper end of the seat back and positioned forwardly of the upper end of the seat back; The neck rest portion has a shape in which the left and right sides bulge forward relative to the center, The headrest includes a headrest body that forms a center of the headrest, a pair of left and right headrest pillars that are connected to the headrest body, a headrest pad that is provided to cover the headrest body, and a cover that covers the headrest pad. the headrest body has an upper body portion coupled to each of the headrest pillars and extending laterally above the seat back, and a lower body portion extending downward from a front lower edge of the upper body portion and disposed in front of the seat back, the headrest pad has an upper pad portion arranged to cover the front, upper, rear, left and right sides of the upper body portion, and a lower pad portion arranged on the front side of the lower body portion, the lower pad portion being continuous with a lower front portion of the upper pad portion, the pad lower portion protrudes forward relative to the pad upper portion, An airbag that expands and contracts by supplying and discharging air is disposed in the neck rest portion, The lower body portion is formed in a plate shape, a lower end portion of the body lower portion extends downward beyond a lower end of the airbag, The vehicle seat, wherein the airbag is disposed between the front surface of the body lower portion and the lower portion of the pad.

2. The lower portion of the pad is located below the upper end of the seat back, 2. The vehicle seat according to claim 1, wherein a cross section of the lower portion of the pad as viewed from the left and right direction is formed in a semicircular shape that is convex forward.

3. 3. The vehicle seat according to claim 2, wherein both left and right end portions of the pad lower portion bulge forward relative to a central portion.

4. 2. The vehicle seat according to claim 1, wherein the airbags are disposed inside both left and right side portions of the neck rest portion.

5. 5. The vehicle seat according to claim 1, wherein the front-to-rear thickness of the lower portion of the pad is greater than the front-to-rear thickness of a portion of the upper portion of the pad that is located forward of the upper body portion.

6. 6. The vehicle seat according to claim 1, further comprising a control device configured to raise or lower the headrest in accordance with the amount of rotation of the seat back when the seat back is rotated forward or backward.

7. the seat back includes a seat back lower portion rotatably provided at a rear portion of the seat cushion and a seat back upper portion rotatably provided at an upper end of the seat back lower portion, 6. The vehicle seat according to claim 1, further comprising a control device configured to raise or lower the headrest in accordance with the amount of rotation of the upper part of the seat back when the upper part of the seat back is rotated forward or backward.

8. The seat cushion is configured by covering a cushion frame forming a skeleton with a pad and a skin material, and is connected to the vehicle floor via a slide device, 8. The vehicle seat according to claim 7, wherein the seat back lower and the seat back upper are formed by covering a seat back lower frame and a seat back upper frame, which form the framework, with a pad and a covering material.

9. 9. The vehicle seat according to claim 8, wherein an ottoman is provided at a front end of the seat cushion in a rotatable manner.

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