Headrest and rear seat

Abstract

To provide a headrest and a rear seat capable of securing sitting comfort of the rear seat while reducing motion sickness of an occupant and securing a wide luggage compartment space in a state where a seat back is fully flat.SOLUTION: The headrest 10 includes the main body portion 22 that is disposed on the upper side in the upright posture of the seat back 18 in the rear seat 12 that is disposed on the vehicle rear side and can take the full flat posture in which the seat back 18 is laid down on the seat cushion 16, and the detachable portion 24 that is detachable from the headrest front surface side of the main body portion 22, is configured to be capable of supporting the head of the occupant from the seat rear side and both sides in the seat width direction in a state of being disposed on the headrest front surface side of the main body portion 22, and is configured to be detachable from the headrest upper surface side of the main body portion 22.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Patent Document 1 below discloses a reclining vehicle seat in which a cushion body is attached to a headrest. The cushion body is attached to the headrest via a connector of a predetermined length. In the technology described in Patent Document 1 below, the cushion body is attached to the rear side of the headrest when the vehicle is traveling. On the other hand, when the seat back is reclined rearward, the cushion body is attached to the front side of the upper end of the seat back and is used as a pillow for the occupant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 56-09050 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, there is a known technology that reduces car sickness by shaping the headrest so that it can support the occupant's head from the rear side of the seat and both sides in the seat width direction, thereby suppressing the shaking of the occupant's head while the vehicle is moving.

[0005] Such headrests for reducing car sickness protrude further forward than general headrests. Therefore, when applying such headrests to the rear seat of a vehicle, in order to fold the seat back onto the seat cushion to make it fully flat, it is necessary to shorten the seat cushion's longitudinal dimension relative to the seat back so that the protruding portion does not interfere with the seat cushion. However, shortening the seat cushion reduces the support area for the occupant's thighs, which may impair seating comfort.

[0006] Another known technology involves attaching an add-on component to the front side of the headrest body, designed to support the occupant's head from the rear side of the seat and both sides in the seat width direction. When using such an add-on component in a rear seat, removing the add-on component from the front side of the headrest body allows the seatback to be fully flattened without the add-on component interfering with the seat cushion. In this case, it is conceivable to attach the add-on component (cushion body) to the rear side of the headrest body, as in the prior art. However, attaching the add-on component to the rear side of the headrest body reduces the cargo space when the seatback is fully flattened.

[0007] Therefore, there is room for improvement in terms of reducing car sickness among passengers, ensuring comfort in the rear seats, and ensuring ample luggage space when the seatbacks are fully flat.

[0008] In consideration of the above, the present invention aims to provide a headrest and a rear seat that can reduce car sickness among occupants, ensure comfort in the rear seat, and ensure a large luggage space when the seat back is fully flat. [Means for solving the problem]

[0009] The headrest of the present invention described in claim 1 comprises a main body portion that is arranged on the upper side of the seat back in an upright position in a rear seat that is arranged at the rear of a vehicle and in which the seat back can be reclined onto a seat cushion and assumes a full flat position, and a detachable portion that is attachable to and detachable from the front side of the headrest of the main body portion and is configured to support the occupant's head from the rear side of the seat and both sides in the seat width direction when arranged on the front side of the headrest of the main body portion, and is also configured to be attachable to and detachable from the upper surface of the headrest of the main body portion.

[0010] According to the present invention as set forth in claim 1, the headrest main body is disposed above the seat back. The detachable portion of the headrest is configured to be detachably attached to the front side of the headrest of the main body. When the seat back is in an upright position and the detachable portion is attached to the front side of the headrest of the main body (hereinafter referred to as the "normal use state"), the detachable portion is supported from the rear side of the seat by the main body. Since the detachable portion is configured to support the occupant's head from the rear side of the seat and both sides in the seat width direction, the head of an occupant seated in a rear seat is supported from the rear side of the seat and both sides in the seat width direction by the detachable portion attached to the front side of the headrest of the main body. This suppresses shaking of the occupant's head and reduces car sickness. Note that the "headrest front side of the main body" here refers to the front side of the seat of the main body when the main body is attached to the seat back in an upright position.

[0011] The detachable part is configured to be detachably attached to the upper surface of the headrest of the main body. When the seatback is in the fully flat position with the seat cushion folded down, and the detachable part is attached to the upper surface of the headrest of the main body (the front side of the seat) (hereinafter referred to as the "stored state"), there is no interference between the detachable part and the seat cushion, regardless of the length of the seat cushion in the front-to-rear direction of the seat. This allows for flexible design of the seat cushion and ensures a large contact area between the seat cushion and the occupant's thighs, without compromising the comfort of sitting on the seat cushion.

[0012] Furthermore, when the seatback is in the fully flat position, the detachable part does not interfere with the luggage compartment space in the stowed state, compared to when the detachable part is attached to the rear side of the headrest of the main body (above the seat), which allows for a larger luggage compartment space in the fully flat position.

[0013] The headrest of the present invention described in claim 2 is the invention described in claim 1, wherein the detachable part is detachable from the rear side of the headrest of the main body part, and can be positioned on the rear side of the headrest of the main body part when the seat back is folded down onto the seat cushion.

[0014] According to the present invention as set forth in claim 2, the detachable part is configured to be detachably attached to the rear side of the headrest of the main body part. When the seat back is in the fully flat position and the detachable part is attached to the rear side of the headrest of the main body part (the upper side of the seat) (hereinafter referred to as the "lying position use state"), the detachable part protrudes above the seat beyond the rear surface of the seat back. Therefore, when an occupant lies down in the luggage compartment with the seat back in the fully flat position, such as when sleeping in the car, the detachable part can be used as a pillow to support the head of the lying occupant.

[0015] The headrest of the present invention described in claim 3 is the invention described in claim 1, wherein the detachable portion is detachable to the underside of the headrest of the main body portion on the front side of the seat back, and is configured to support the occupant's head from the rear side of the seat and both sides in the seat width direction when placed on the underside of the headrest of the main body portion.

[0016] According to the present invention as set forth in claim 3, the detachable part is configured to be detachably attached to the underside of the headrest of the main body on the front side of the seat back. When a small occupant sits in the rear seat, if the detachable part is located on the front side of the headrest of the main body, there is a possibility that the head of the small occupant may not be able to reach the height of the detachable part.

[0017] In contrast, when a small occupant sits in the rear seat with the seat back in an upright position and the detachable portion positioned on the underside of the headrest of the main body and on the front side of the seat back (hereinafter referred to as the "state for use by a small occupant"), the detachable portion is positioned on the rear side of the seat of the small occupant. In other words, the head of the small occupant is supported on the rear side of the seat and from both sides in the seat width direction by the detachable portion positioned on the underside of the headrest of the main body. This prevents the head of the small occupant from shaking.

[0018] The headrest of the present invention described in claim 4 is the invention described in claim 3, wherein the main body portion or the detachable portion is provided with a support member having higher rigidity than the pad of the seat back, and the support member is configured to be positionable between the detachable portion and the seat back when the detachable portion is positioned on the underside of the headrest of the main body portion.

[0019] According to the present invention as set forth in claim 4, the main body or detachable part is provided with a support member having higher rigidity than the seatback pad. This support member is arranged between the detachable part and the seatback when used by a small-sized passenger. In other words, when the seatback is in an upright position, the support member is arranged on the rear side of the detachable part and on the front side of the seatback. As a result, when a small-sized passenger rests their head on the detachable part, the detachable part receives a repulsive force from the support member arranged on its rear side. Therefore, sinking of the detachable part into the seatback is suppressed compared to when the support member is not present. This further suppresses shaking of the head of a small-sized passenger, further reducing car sickness.

[0020] The headrest of the present invention described in claim 5 is the invention described in claim 4, in which the support member is slidably provided on the main body portion and is configured to be able to be stored in the main body portion and to be able to be deployed on the lower side of the headrest of the main body portion.

[0021] According to the present invention as set forth in claim 5, the support member is stored in the main body when not in use. Therefore, when the support member is not in use, the support member does not get in the way of the occupant and does not impair the external design of the rear seat.

[0022] Furthermore, when the detachable part is located on the underside of the headrest of the main body and on the front side of the seat back for use by a small occupant, the support member is deployed from its stored state in the main body to the underside of the headrest and positioned between the detachable part and the seat back, thereby further reducing car sickness in small occupants, as described above.

[0023] The support member is slidably mounted on the main body. This allows the support member to move within a minimal space compared to when the support member is deployed and stored by a mechanism such as a rotation mechanism. This eliminates the need to change the design of other parts of the headrest or the seat back to avoid interference between the support member and other parts of the headrest or the seat back.

[0024] The headrest of the present invention described in claim 6 is the invention described in claim 1, wherein when the detachable portion is positioned on the front side of the headrest of the main body portion, one end portion of the detachable portion on both sides of the seat width direction above the headrest and one end portion of the main body portion on both sides of the seat width direction above the headrest and in front of the headrest are connected by a pair of left and right first connecting members, and the detachable portion is configured to be movable between the front side of the headrest and the top side of the headrest of the main body portion while the one end portion of the detachable portion and the end portion of the main body portion on the front side of the headrest and in front of the headrest remain connected by the first connecting members.

[0025] According to the present invention described in claim 6, in the normal use state, one end of the detachable portion on both sides in the seat width direction, above the headrest, and one end of the main body portion on both sides in the seat width direction, above the headrest and in front of the headrest, are connected by a first connecting member. The detachable portion moves between the front side of the headrest of the main body portion and the top side of the headrest while remaining connected to the main body portion by this pair of left and right first connecting members. Specifically, in a side view of the seat, one end of the detachable portion moves in a rolling manner on the surface of the end of the main body portion above the headrest and in front of the headrest, while the other end moves by rotating in an arc around the one end as a fulcrum. This eliminates the need to detach the first connecting member from the main body portion and the detachable portion. This allows for quick switching between the normal use state and the storage state.

[0026] The headrest of the present invention as described in claim 7 is the invention as described in claim 6, wherein when the detachable portion is positioned on the front side of the headrest of the main body portion, the other end portion of the detachable portion on the lower side of the headrest on both sides of the seat width direction and the end portion on the front side of the headrest and on the lower side of the headrest on both sides of the seat width direction of the main body portion are connected by a pair of second connecting members on the left and right, respectively.

[0027] According to the present invention as set forth in claim 7, in the normal use state, the other end portions of the detachable portion on both sides of the seat width direction, below the headrest, are connected to the ends of the main body portion on both sides of the seat width direction, forward of the headrest and below the headrest, by a pair of left and right second connecting members. In other words, in the normal use state, the detachable portion is fixed to the main body portion at both ends of the headrest in the up-down direction. This prevents the detachable portion from floating or shifting relative to the main body portion in the normal use state. Therefore, the detachable portion is stabilized, further suppressing shaking of the occupant's head.

[0028] The headrest of the present invention described in claim 8 is the invention described in claim 7, wherein when the detachable portion is positioned on the upper surface of the headrest of the main body portion, the other end portion of the detachable portion on both side surfaces in the seat width direction is connected to the end portions of the main body portion on both side surfaces in the seat width direction above the headrest and rearward of the headrest by the pair of left and right second connecting members.

[0029] According to the present invention as set forth in claim 8, in the stored state, one end of the detachable portion on each side in the seat width direction is connected to ends of the main body portion on both sides in the seat width direction above the headrest and in front of the headrest by a pair of left and right first connecting members. Furthermore, the other end of the detachable portion on each side in the seat width direction is connected to ends of the main body portion on both sides in the seat width direction above the headrest and in front of the headrest by a pair of left and right second connecting members. In other words, in the stored state, the detachable portion is fixed to the main body portion at both ends in the front-rear direction of the headrest. Therefore, the detachable portion is stably fixed to the main body portion, and the detachable portion does not swing even when the occupant does not use the detachable portion.

[0030] The rear seat of the present invention described in claim 9 comprises a seat cushion arranged at the rear of the vehicle and capable of supporting the buttocks and thighs of an occupant; a seat back connected to the rear end of the seat cushion and capable of assuming a fully flat position when reclined onto the seat cushion and capable of supporting the back of the occupant in an upright position; a main body portion arranged on the upper side of the seat back in the upright position; and a headrest comprising: a detachable portion that is attachable to the front side of the headrest of the main body portion and is configured to support the occupant's head from the rear side of the seat and both sides in the seat width direction when positioned at the front side of the headrest of the main body portion, and is detachable from the upper surface of the headrest of the main body portion.

[0031] According to the present invention as set forth in claim 9, the buttocks and thighs of the occupant are supported by the seat cushion, and the back of the occupant is supported by the seat back.

[0032] When the seatback is in the upright position, in normal use, the detachable part is supported from the rear side of the seat by the main body. The head of the passenger sitting in the rear seat is supported by the detachable part from the rear side of the seat and both sides in the seat width direction. This suppresses shaking of the passenger's head and reduces car sickness.

[0033] Furthermore, when the seat back is in the fully flat position, the detachable part does not interfere with the seat cushion when attached to the upper surface of the headrest of the main body (the front side of the seat), regardless of the length of the seat cushion in the front-to-rear direction of the seat. This allows for flexible design of the seat cushion and ensures a large contact area between the seat cushion and the thighs of the occupant, without compromising the comfort of sitting on the seat cushion.

[0034] Furthermore, when the seatback is in the fully flat position, the detachable part does not interfere with the luggage compartment space in the stowed state, compared to when the detachable part is attached to the rear side of the headrest of the main body (above the seat), which allows for a larger luggage compartment space in the fully flat position. [Effects of the Invention]

[0035] As described above, the headrest according to the present invention as set forth in claim 1 has the excellent effect of reducing car sickness in occupants, ensuring comfort in the rear seats, and ensuring a large luggage compartment when the seat backs are fully flat.

[0036] The headrest according to the present invention as set forth in claim 2 has the excellent effect of being able to support the head of an occupant as a pillow when the occupant lies down in the luggage compartment.

[0037] The headrest according to the present invention as set forth in claim 3 has the excellent effect of reducing car sickness in small passengers.

[0038] The headrest according to the present invention as set forth in claim 4 has the excellent effect of further reducing car sickness in small passengers.

[0039] The headrest of the present invention described in claim 5 has the excellent effect of further reducing car sickness in small occupants while maintaining design freedom for parts other than the headrest support member and the seat back.

[0040] The headrest according to the present invention as set forth in claim 6 has the excellent effect of being able to quickly switch between the normal use state and the stored state.

[0041] The headrest according to the present invention as set forth in claim 7 has the excellent effect of further reducing car sickness of the occupant in normal use.

[0042] The headrest according to the present invention as set forth in claim 8 has the excellent effect of being able to suppress the generation of abnormal noise in the stored state and also being able to improve the design of the headrest.

[0043] The rear seat of the present invention described in claim 9 has the excellent effect of reducing car sickness among occupants, ensuring comfort in the rear seat, and ensuring a large luggage compartment when the seat back is fully flat. [Brief explanation of the drawings]

[0044] [Figure 1] FIG. 2 is a left side view of a rear seat equipped with a headrest according to the present embodiment, showing a normal use state in which the detachable portion is disposed on the front side of the headrest of the main body portion. [Figure 2] 2 is a perspective view of the headrest shown in FIG. 1, seen from diagonally above the left side. FIG. [Figure 3] 2 is a left side view of the rear seat shown in FIG. 1 with the seat back in a fully flat position, showing a stowed state in which the detachable part is arranged on the upper surface side of the headrest of the main body part. FIG. [Figure 4] 2 is a left side view of the rear seat shown in FIG. 1 with the seat back in a fully flat position, showing the state in which the seat is used in a lying position with the detachable part disposed on the back side of the headrest of the main body part. FIG. [Figure 5] 1 is arranged on the underside of the headrest of the main body portion when used by a small person. [Figure 6] FIG. 10 is a left side view of a rear seat equipped with a headrest according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0045] 1 to 5, a headrest 10 according to one embodiment of the present invention will be described below. Note that the arrows FR, UP, and RH shown as appropriate in each figure indicate the front side of the seat, the upper side of the seat, and the right side in the seat width direction of a rear seat 12 for a vehicle equipped with the headrest 10. Furthermore, when the front-rear, up-down, and left-right directions are used in the following description unless otherwise specified, they refer to the front-rear in the seat front-rear direction, the up-down in the seat up-down direction, and the left-right in the seat left-right direction (width direction), respectively.

[0046] 1 and 4 show a crash test dummy P as a model of an occupant seated on the seat cushion 16 of the rear seat 12. The dummy P is, for example, a frontal crash test dummy (Hybrid III) AM50 (50th percentile of American adult males). The dummy P is seated in a standard seating position defined by the crash test method. The rear seat 12 is positioned at a reference setting position corresponding to the seating position. For ease of explanation, the dummy P will be referred to as the "occupant P" below.

[0047] (Overall configuration of rear seat 12) FIG. 1 shows a left side view of a rear seat 12 for a vehicle equipped with a headrest 10. The rear seat 12 is disposed in the rear of the vehicle, on the vehicle front side of a luggage compartment 14. The rear seat 12 includes a seat cushion 16 that supports the buttocks and thighs of an occupant P, a seatback 18 that is rotatably connected to the rear end of the seat cushion 16 and supports the back of the occupant P, and a headrest 10 that is attached to the upper end of the seatback 18 and supports the head of the occupant P. The rear seat 12 can be placed in a fully flat position (see FIGS. 3 and 4). Specifically, the seatback 18 can be rotated toward the front of the seat and folded down onto the seat cushion 16.

[0048] (Overall configuration of headrest 10) As shown in Fig. 2, the headrest 10 comprises a main body 22 attached to the upper end of the seat back 18 via a metal headrest stay 20, and a detachable part 24 detachably attached to the main body 22. The headrest stays 20 are inserted into a pair of left and right insertion holes (not shown) at the upper end of the seat back 18 (see Fig. 1). The headrest stays 20 are slidable in the approximately vertical direction relative to the insertion holes in the seat back 18, thereby allowing the height of the main body 22 relative to the seat back 18 to be changed.

[0049] 1, the seat back 18 is in an upright position, and the detachable part 24 is disposed on the front side of the headrest of the main body part 22. In this state, the detachable part 24 supports the head of an occupant P seated in the rear seat 12. Hereinafter, the state in which the seat back 18 is in an upright position and the detachable part 24 is disposed on the front side of the headrest of the main body part 22 as described above will be referred to as the "normal use state."

[0050] (Main body 22) 2, the main body 22 is configured to include headrest stays 20 that form the framework, a pad main body (not shown) that covers the headrest stays 20, a skin 22A that covers the pad main body, and a support member 26, which will be described later. The pad main body is made of foam resin such as polyurethane foam, and is foam-molded with the headrest stays 20 embedded in it. The skin 22A is configured by sewing together a plurality of skin pieces made of, for example, cloth, knit material, synthetic leather, leather, or the like.

[0051] 1, the main body 22 is formed in a substantially L-shape when viewed from the side of the headrest, and includes a seatback connection portion 28 disposed above the seatback 18, and a head support portion 30 extending from the front end of the seatback connection portion 28 toward the lower side of the headrest. When the main body 22 is attached to the seatback 18, the back surface of the main body 22 is substantially flush with the back surface of the seatback 18. When the main body 22 is located at the lowest end and in contact with the seatback 18, the head support portion 30 is disposed on the front side of the upper end of the seatback 18.

[0052] Furthermore, the main body portion 22 is formed in a substantially rectangular shape when viewed from above the headrest and from the front side of the headrest, and has substantially the same shape as the shape of the detachable portion 24 when viewed from the front-to-rear direction of the seat in the normal use state.

[0053] As shown in Figure 2, the headrest stay 20 protrudes from inside the seatback connection portion 28 toward the lower side of the headrest and has a pair of left and right insertion portions 20A inserted into a pair of left and right insertion holes (not shown) at the upper end of the seatback 18.

[0054] The headrest stays 20 extend from the main body 22 into the seat back connection portion 28 and the head support portion 30. Specifically, the headrest stays 20 have a pair of left and right front-rear extending portions (not shown) that extend from upper ends of the pair of left and right insertion portions 20A toward the front side of the headrest inside the seat back connection portion 28. The headrest stays 20 also have a pair of left and right up-down extending portions (not shown) that extend from front ends of the pair of left and right front-rear extending portions toward the lower side of the headrest inside the head support portion 30. Furthermore, the headrest stays 20 have a left and right connecting portion (not shown) that connects lower ends of the pair of left and right up-down extending portions together in the width direction of the headrest inside the head support portion 30.

[0055] (Detachable part 24) The detachable part 24 includes a pad main body (not shown) and a skin 24A that covers the pad main body. The skin 24A of the detachable part 24 is made of the same material as the skin 22A of the main body part 22.

[0056] The detachable portion 24 includes a thin-plate-shaped base portion 32 that is arranged to cover the front side of the main body portion 22 in the normal use state, and a pair of left and right protrusions 34 that protrude from both left and right end portions of the base portion 32 toward the front side of the headrest. In other words, the detachable portion 24 has a shape in which the center portion in the headrest width direction on its front side (the side that supports the head of the occupant P in the normal use state) is recessed toward the rear side of the headrest. The back side of the base portion 32 is formed flat. The spacing between the pair of left and right protrusions 34 narrows toward the lower side of the headrest. As a result, in the normal use state, the head of the occipital bone and the surrounding area of ​​the occipital bone are stably supported from the rear side of the seat and both sides in the seat width direction.

[0057] (detachable mechanism) As shown in Figures 1, 3, 4 and 5, the detachable portion 24 is configured to be detachable from the front side of the headrest, the top side of the headrest, the rear side of the headrest and the bottom side of the headrest of the main body portion 22, respectively.

[0058] 2, a first button 36 and a second button 38 are fixed to the left side of the main body 22, on the front side of the headrest. The first button 36 is fixed to an end of the left side of the main body 22, above the headrest and on the front side of the headrest. The second button 38 is fixed to an end of the left side of the main body 22, on the front side of the headrest and on the lower side of the headrest.

[0059] A third button 40 is fixed to the end of the left side of the main body 22 above the headrest and toward the rear of the headrest. A fourth button 42 is fixed to the end of the left side of the main body 22 above the headrest, toward the rear of the headrest from the first button.

[0060] The first button 36, the second button 38, the third button 40, and the fourth button 42 are all sewn to the outer skin 22A of the main body 22. The main body 22 is configured symmetrically, and illustrations and descriptions of the first, second, third, and fourth buttons sewn to the right side surface are omitted.

[0061] Furthermore, on both the left and right sides of the detachable part 24, a fifth button 46 is fixed to one end 44, and a sixth button 50 is fixed to the other end 48. The pair of left and right fifth buttons 46 and the pair of left and right sixth buttons 50 are both sewn to the skin 24A.

[0062] [Normal use conditions] 1, an end portion of the left side of the main body 22 above the headrest and in front of the headrest is connected to one end 44 of the detachable part by a first band-shaped member 52 serving as a first connecting member. Also, in the normal use state, an end portion of the left side of the main body 22 in front of the headrest and in front of the headrest is connected to the other end 48 of the detachable part 24 by a second band-shaped member 54 serving as a second connecting member.

[0063] Specifically, the first belt-shaped member 52 and the second belt-shaped member 54 are made of, for example, strong cloth, and have buttonholes (not shown) formed at both ends. In normal use, the first button 36 of the main body 22 is fastened to one buttonhole of the first belt-shaped member 52, and the fifth button 46 of the attachment / detachment part 24 is fastened to the other buttonhole of the first belt-shaped member 52.

[0064] In addition, in the normal use state, the second button 38 of the main body 22 is hooked onto one buttonhole of the second belt-shaped member 54, and the sixth button 50 of the detachable part 24 is hooked onto the other buttonhole of the second belt-shaped member 54. In this way, in the normal use state, the detachable part 24 is fixed to the main body 22 at both ends in the up-down direction of the headrest.

[0065] The right side of the headrest 10 is similar to the left side of the seat described above, and the right side of the main body 22 and the right side of the detachable part 24 are connected by a first belt-shaped member and a second belt-shaped member. The detachable part 24 can be removed from the main body 22 by removing the first belt-shaped member 52 and the second belt-shaped member 54 on the left side of the seat and the first and second belt-shaped members on the right side of the seat.

[0066] [Stored state] 3 shows the rear seat 12 in a fully flat position with the seat back 18 reclined onto the seat cushion 16. As shown in Fig. 3, the detachable part 24 is attached to the upper surface of the headrest of the main body 22. This state in which the detachable part 24 is attached to the upper surface of the headrest of the main body 22 is referred to as the "stored state."

[0067] In the stored state, the end of the left side of the main body 22 above the headrest (front of the seat) and in front of the headrest (lower of the seat) and one end 44 of the detachable part 24 are connected by a first belt-shaped member 52, as in the normal use state.

[0068] On the other hand, in the stored state, the end of the left side of the main body 22 above the headrest (front side of the seat) and behind the headrest (upper side of the seat) is connected to the other end 48 of the detachable part 24 by a second band-shaped member 54. Specifically, the third button 40 of the main body 22 is hooked into one buttonhole of the second band-shaped member 54, and the sixth button 50 of the detachable part 24 is hooked into the other buttonhole of the second band-shaped member 54. In this way, in the stored state, the detachable part 24 is fixed to the main body 22 at both ends in the up-down direction of the seat.

[0069] The first and second strap-shaped members 52, 54 may be hung in the reverse order. That is, in the stored state, the first strap-shaped member 52 may be hung on the third button 40 and the sixth button 50, and the second strap-shaped member 54 may be hung on the first button 36 and the fifth button 46.

[0070] Here, the ends of the main body 22 above the headrest (toward the front of the seat) and in front of the headrest (toward the bottom of the seat) and one end 44 of the detachable part 24 are each rounded in a side view of the headrest. As a result, when transitioning from the normal use state to the stored state, or vice versa, the second belt-shaped member 54 is detached, and the detachable part 24 can move in a rolling manner on the surface of the main body 22 while the first belt-shaped member 52 remains hooked on the first button 36 and the fifth button 46.

[0071] When the detachable part 24 is moved in this manner, the front side of the detachable part 24 (the side that comes into contact with the head of the occupant P in the normal use state shown in FIG. 1) is disposed opposite the upper surface of the main body part 22 in the stored state. Note that the orientation in which the detachable part 24 is disposed on the upper surface of the headrest of the main body part 22 is not limited to the above, and the back side of the detachable part 24 may be disposed opposite the upper surface of the main body part 22. Furthermore, in the stored state, the one end part 44 and the other end part 48 may be disposed in reverse.

[0072] [Using state in lying position] FIG. 4 shows a state in which the seat back 18 is in a fully flat position and the detachable portion 24 is attached to the rear side of the headrest (hereinafter referred to as a "lying position use state").

[0073] In the lying-down use state, the end of the left side of the main body 22 above the headrest (front side of the seat) and behind the headrest (upper side of the seat) is connected to one end 44 of the detachable part 24 by a first belt-shaped member 52. Specifically, the third button 40 of the main body 22 is hooked onto one buttonhole of the first belt-shaped member 52, and the fifth button 46 of the detachable part 24 is hooked onto the other buttonhole of the first belt-shaped member 52.

[0074] At this time, the unused second belt-shaped member 54 is hooked onto the first button 36 and the fourth button 42 of the main body 22 to prevent it from dangling. The first belt-shaped member 52 and the second belt-shaped member 54 may be hooked in the opposite direction. That is, in the lying-down use state, the third button 40 of the main body 22 and the fifth button 46 of the detachable part 24 may be connected by the second belt-shaped member 54. The one end 44 and the other end 48 of the detachable part 24 may be arranged in the opposite direction.

[0075] In the lying-down use state, the detachable part 24 is placed on the back of the seatback connection part 28 of the main body part 22 and on the upper side of the seat on the back of the seatback 18. In other words, the detachable part 24 protrudes above the seat beyond the back of the seatback 18. This allows the occupant P to use the detachable part 24 as a pillow when lying down in the luggage compartment 14, such as when sleeping in the vehicle. In this case, as an example, the front side of the detachable part 24 (the side that comes into contact with the head of the occupant P in the normal use state shown in FIG. 1) is positioned so that it faces the upper side of the seat.

[0076] [Suitable for small people] 5 shows a state (hereinafter referred to as the "short person use state") in which the seat back 18 is in an upright position and the detachable part 24 is disposed on the underside of the headrest of the main body part 22. In the short person use state, the detachable part 24 is disposed further downward in the seat than in the normal use state, and the head of an occupant S (hereinafter referred to as the "short person S") who is smaller than the occupant P, such as a woman or a child, is supported on the front side of the detachable part 24.

[0077] In the state for use by a small person, the end of the left side of the main body 22 in front of and below the headrest is connected to one end 44 of the detachable part 24 by a second belt-shaped member 54. Specifically, the second button 38 of the main body 22 is hooked onto one buttonhole of the second belt-shaped member 54, and the fifth button 46 of the detachable part 24 is hooked onto the other buttonhole of the second belt-shaped member 54.

[0078] At this time, the unused first strap-shaped member 52 is hooked onto the first button 36 and the fourth button 42 of the main body portion 22 to prevent it from dangling. The first strap-shaped member 52 and the second strap-shaped member 54 may be hooked in the opposite direction. In other words, when used by a small person, the second button 38 of the main body portion 22 and the fifth button 46 of the attachment / detachment portion 24 may be connected by the first strap-shaped member 52.

[0079] 1, the main body 22 is provided with a plate-like support member 26 that is more rigid than the pad of the seat back 18. A slide mechanism (not shown) is provided on the back surface of the head support portion 30 of the main body 22. The support member 26 is attached to this slide mechanism and is slidable in the approximately vertical direction of the headrest.

[0080] In the normal use state shown in FIG. 1, the support member 26 is stored between the back surface of the head support portion 30 of the main body portion 22 and the front surface of the upper end portion of the seat back 18.

[0081] 5, the support member 26 is deployed below the headrest of the main body 22 by a slide mechanism (not shown). At this time, the support member 26 is positioned on the front side of the seat back 18. In the state for use by a small person, the detachable part 24 is positioned so as to cover the deployed support member 26 from the front side of the seat. In other words, in the state for use by a small person, the support member 26 is positioned between the detachable part 24 and the seat back 18.

[0082] (Action of this embodiment) Next, the operation of this embodiment will be described.

[0083] 1, the head of an occupant P seated in the rear seat 12 is supported from the rear side of the seat and both sides in the seat width direction by the detachable part 24. This suppresses shaking of the head of the occupant P, and reduces car sickness of the occupant P.

[0084] 3, the detachable portion 24 is disposed on the upper surface side of the headrest of the main body 22 (the front side of the seat). Therefore, the detachable portion 24 does not interfere with the seat cushion 16 when the seat back 18 is in the fully flat position, regardless of the length of the seat cushion 16 in the front-to-rear direction of the seat. This allows the seat cushion 16 to be designed freely, and ensures a large contact area between the seat cushion 16 and the thighs of the occupant P (see FIG. 1) in the normal use state. This therefore prevents the seat cushion 16 from impairing comfort.

[0085] Furthermore, in this stored state, the detachable part 24 does not interfere with the space of the luggage compartment 14. Therefore, compared to when the detachable part 24 is attached to the rear side of the headrest (above the seat) of the main body 22, a larger space can be secured in the luggage compartment 14 when the seat back 18 is in the full-flat position.

[0086] Furthermore, with the headrest 10 and rear seat 12 according to this embodiment, in the lying-down use state shown in Fig. 4, the detachable part 24 is attached to the rear side of the headrest (the upper side of the seat) of the main body 22. As a result, the detachable part 24 protrudes above the seat beyond the rear surface of the seatback 18. Therefore, when the seatback 18 of the rear seat 12 is in the fully flat position and the occupant P lies down in the luggage compartment 14, for example, while sleeping in the vehicle, the detachable part 24 can be used as a pillow to support the head of the lying occupant P.

[0087] 5, the head of the small person S is supported from the rear side of the seat and both sides in the width direction of the seat by the detachable portion 24. This suppresses shaking of the head of the small person S, and reduces car sickness of the small person S.

[0088] Here, the support member 26 is deployed downward from the state stored in the main body 22 in the normal use state shown in FIG. 1 to be positioned behind the detachable part 24 and in front of the seat back 18 in the state used by a small person. As a result, when the small person S leans their head against the detachable part 24, the detachable part 24 receives a repulsive force from the support member 26 positioned behind it. Therefore, compared to when the support member 26 is not present, the detachable part 24 is less likely to sink into the seat back 18 in the state used by a small person, and the head of the small person S is stably supported by the detachable part 24. Therefore, shaking of the head of the small person S is further suppressed, and car sickness is further alleviated.

[0089] Furthermore, the support member 26 is slidably mounted on the main body 22 by a slide mechanism (not shown). Therefore, the support member 26 can be moved within a minimal space compared to when the support member 26 is deployed and stored by a mechanism such as a rotation mechanism. Therefore, it is not necessary to change the design of the other parts of the headrest 10 or the seat back 18 in order to avoid interference between the support member 26 and the other parts of the headrest 10 (for example, the headrest stay 20 shown in FIG. 2) or the seat back 18.

[0090] 1 to 4, in the headrest 10 and rear seat 12 according to this embodiment, when the support member 26 is not in use by the small person S, it is stored between the back surface of the head support portion 30 of the main body portion 22 and the front surface of the upper end portion of the seat back 18. Therefore, when the support member is not in use, the support member does not get in the way of the occupant P, and the external design of the rear seat 12 is not impaired.

[0091] 1 and 3, in the headrest 10 and rear seat 12 according to this embodiment, the detachable portion 24 moves between the headrest front side and the headrest upper side of the main body 22 while remaining connected to the main body 22 by the first belt-shaped member 52. Specifically, in a side view of the seat, one end 44 of the detachable portion 24 moves in a rolling manner on the surface of the end of the main body 22 above the headrest and in front of the headrest, while the other end 48 rotates in an arc around the one end 44 as a fulcrum. This eliminates the need to detach the first belt-shaped member 52 from the main body 22 and the detachable portion 24. This allows for quick switching between the normal use state and the storage state.

[0092] 1, in the headrest 10 and rear seat 12 according to this embodiment, in the normal use state, the detachable part 24 is fixed to the main body part 22 at both ends of the headrest in the up-down direction. This prevents the detachable part 24 from floating or shifting relative to the main body part 22 in the normal use state. Therefore, the detachable part 24 is stabilized, and shaking of the head of the occupant P is further suppressed. This further reduces car sickness of the occupant P.

[0093] 3, in the headrest 10 and rear seat 12 according to this embodiment, in the stored state, the detachable portion 24 is fixed to the main body 22 at both ends in the front-to-rear direction of the headrest (the seat vertical direction). Therefore, the detachable portion 24 is stably fixed to the main body 22, and does not swing even when the occupant P does not use the detachable portion 24. Therefore, in the stored state, it is possible to suppress the generation of abnormal noise and improve the design of the headrest 10.

[0094] Furthermore, in the headrest 10 and rear seat 12 according to this embodiment, as shown in Fig. 2, the same material is used for the skin 24A of the detachable portion 24 as for the skin 22A of the main body 22. This creates a sense of unity between the main body 22 and the detachable portion 24, improving the external design of the headrest 10.

[0095] Furthermore, with the headrest 10 and rear seat 12 according to this embodiment, in the lying-down use state shown in Fig. 4, the front side of the detachable portion 24 is arranged to face the upper side of the seat. As a result, when the occupant P sleeps on his / her back, the base portion 32 (see Fig. 2) in the center of the headrest in the width direction comes into contact with the head of the occupant P, allowing the occupant P to use the detachable portion 24 as a low pillow. On the other hand, when the occupant P turns over and sleeps on his / her side, the protruding portion 34 (see Fig. 2) comes into contact with the head, allowing the occupant P to use the detachable portion 24 as a high pillow. Therefore, by arranging the front side of the detachable portion 24 to face the upper side of the seat in the lying-down use state, the comfort of the detachable portion 24 as a pillow is improved.

[0096] 1 and 5, the main body 22 is located at the lowest end, but according to the headrest 10 and rear seat 12 according to this embodiment, the main body 22 is attached to the seat back 18 so as to be slidable in the seat up and down direction. Therefore, by pulling the main body 22 out from the seat back 18 and positioning it higher on the seat than in FIGS. 1 and 5, the detachable part 24 can also support the heads of occupants of different builds other than the occupant P and the small person S.

[0097] Furthermore, according to the headrest 10 of this embodiment, the headrest stay 20 shown in Fig. 2 includes a pair of left and right vertical extending portions (not shown) and a left and right connecting portion (not shown) inside the head support portion 30. In normal use, the detachable portion 24 arranged on the front side of the headrest of the main body portion 22 receives a repulsive force from the headrest stay 20 extending inside the head support portion 30. Therefore, the head of the occupant P is better supported than when the headrest stay extends only inside the seat back connecting portion of the main body portion.

[0098] [Supplementary explanation of the above embodiment] In the above embodiment, the detachable portion 24 is configured to be detachable not only to the front side and top side of the headrest of the main body 22 but also to the rear side and bottom side of the headrest of the main body 22. However, this is not limiting. For example, the detachable portion may be configured to be detachable only to the front side and top side of the headrest of the main body 22.

[0099] In the above embodiment, the support member 26 is described as being slidably attached to the main body 22, but this is not limiting. For example, the support member may be rotatably attached to the main body. The support member may also be disposed inside the pad on the rear side of the detachable portion or at the rear of the detachable portion.

[0100] Furthermore, in the above embodiment, the main body 22 is described as including the second button 38, and in the normal use state, the second button 38 of the main body 22 and the sixth button 50 of the detachable part 24 are connected by the second strip-shaped member 54. However, this is not limited to this. For example, the main body may not be provided with the second button. In this case, the detachable part in the normal use state is connected to the main body at only one end.

[0101] Furthermore, in the above embodiment, the front side of the detachable part 24 is described as being arranged to face the upper side of the seat in the lying-down use state shown in Fig. 4, but the orientation of the detachable part 24 is not limited to this, and the back side of the detachable part 24 may be arranged to face the upper side of the seat. In this case, the detachable part 24 is used as a flat pillow.

[0102] Furthermore, in the above embodiment, the main body 22 of the headrest 10 is described as being molded separately from the seat back 18 and attached to the seat back 18 so as to be slidable in the approximately vertical direction of the seat, but this is not limited to this, and the main body of the headrest may be molded integrally with the seat back.

[0103] Furthermore, in the above embodiment, the first belt-shaped member 52 and the second belt-shaped member 54 each have buttonholes formed at both ends, and the detachable portion 24 is connected to the main body portion 22 using a fastening mechanism. However, this is not limited to this. For example, the detachable portion may be connected to the main body portion using other types of buttons, such as snap buttons, and a connecting member connecting the buttons. Furthermore, the connecting member is not limited to a belt-like member, and may be any member capable of connecting the detachable portion to the main body portion. For example, it may be a string-like or rubber-like member. Furthermore, the method by which the connecting member is fastened to the detachable portion and the main body portion is not limited to buttons. For example, other fastening methods, such as hooks, may be used. Furthermore, the headrest does not need to include the first connecting member and the second connecting member. For example, hook-and-loop fasteners may be sewn to the back side of the detachable portion and the front, top, back, and bottom sides of the main body portion, and the detachable portion may be attached to and detached from the main body portion via these hook-and-loop fasteners.

[0104] Furthermore, in the above embodiment, the main body 22 is described as being formed in a substantially L-shape when viewed from the side of the headrest, but this is not limited thereto. For example, as in the modified example shown in Fig. 6, the main body 66 of the headrest 60 may be formed in a substantially rectangular shape when viewed from the side of the headrest. In the following modified examples, the same components as those in the above embodiment will be denoted by the same reference numerals, and their description will be omitted as appropriate.

[0105] (Variation) 6 shows a rear seat 62 according to a modified example. The rear seat 62 includes a seat cushion 16, a seat back 64 rotatably connected to the rear end of the seat cushion 16, and a headrest 60. The headrest 60 includes a main body 66 formed in a substantially rectangular parallelepiped shape and attached to the upper end of the seat back 18, and detachable portions 24 configured to be detachable on the front, upper, rear, and lower sides of the main body 66. The dimension of the seat back 64 in the substantially vertical direction is shorter than the dimension of the seat back 18 of the rear seat 12 according to the above-described embodiment in the substantially vertical direction.

[0106] The main body 66 is provided with a plate-like support member 68 that is more rigid than the pad of the seat back 64. A slide mechanism (not shown) is provided inside the lower part of the main body 66, and the support member 68 is attached to this slide mechanism, which allows the support member 68 to slide substantially in the vertical direction of the headrest.

[0107] 6, the support member 68 is stored inside the main body 66. On the other hand, although not shown, in a state of use by a small person in which the detachable part 24 is located on the underside of the main body 66 and on the front side of the seat back 64, the support member 68 is deployed and positioned below the headrest of the main body 66 by a slide mechanism (not shown). Although a detailed description is omitted, the headrest 60 and rear seat 62 according to this modified example can provide the same effects as those of the above-described embodiment.

[0108] The following additional notes are provided regarding the above-described embodiments.

[0109] (Appendix 1) a main body portion disposed above the seat back in an upright position in a rear seat that is disposed at the rear of a vehicle and that can assume a full-flat position with the seat back folded down onto a seat cushion; a detachable attachment portion that is detachably attached to a front surface of the headrest of the main body portion and that is configured to support the occupant's head from the rear side of the seat and both sides in the seat width direction when the main body portion is placed on the front surface of the headrest, and that is detachably attached to an upper surface of the headrest of the main body portion; A headrest having a (Appendix 2) the detachable portion is detachably attached to the rear side of the headrest of the main body portion, and can be disposed on the rear side of the headrest of the main body portion when the seat back is folded down onto the seat cushion. 1. A head restraint as described in Appendix 1. (Appendix 3) The detachable portion is detachably attached to the underside of the headrest of the main body portion on the front side of the seat back, and is configured to support the head of the occupant from the rear side of the seat and from both sides in the seat width direction when the detachable portion is arranged on the underside of the headrest of the main body portion. 3. A headrest according to claim 1 or claim 2. (Appendix 4) The main body or the detachable part includes a support member having a higher rigidity than the pad of the seat back, and the support member is configured to be able to be arranged between the detachable part and the seat back in a state where the detachable part is arranged on the underside of the headrest of the main body and on the front side of the seat back. 1. A head restraint as described in Appendix 3. (Appendix 5) The support member is slidably provided on the main body portion, and is configured to be retractable into the main body portion and to be deployable below the headrest of the main body portion. 1. A headrest as described in Appendix 4. (Appendix 6) When the detachable portion is disposed on the headrest front side of the main body portion, one end portion of the detachable portion on both sides in the seat width direction above the headrest and one end portion of the main body portion on both sides in the seat width direction above the headrest and in front of the headrest are connected by a pair of left and right first connecting members, and the detachable portion is configured to be movable between the headrest front side and the headrest upper side of the main body portion while the one end portion of the detachable portion and the end portion of the main body portion on the headrest above and in front of the headrest are connected by the first connecting members. A headrest according to any one of Supplementary Notes 1 to 5. (Appendix 7) When the detachable portion is disposed on the front side of the headrest of the main body portion, the other end portion of the detachable portion on the lower side of the headrest on both sides in the seat width direction and the end portion of the main body portion on the front side of the headrest and on both sides in the seat width direction on the lower side of the headrest are connected by a pair of left and right second connecting members, respectively. 1. A head restraint as described in Appendix 6. (Appendix 8) When the detachable portion is disposed on the headrest upper surface side of the main body portion, the other end portions of the detachable portion on both side surfaces in the seat width direction are connected to the end portions of the main body portion on the upper side of the headrest and on the rear side of the headrest by the pair of left and right second connecting members. 7. A headrest as described in Appendix 7. [Explanation of symbols]

[0110] 10, 60 Headrest 12, 62 rear seats 16 seat cushions 18, 64 seat back 22, 66 Main body 24 Detachable part 26, 68 Support member 44 One end 48 Other end 52 First belt-shaped member (first connecting member) 54 Second belt-shaped member (second connecting member) 60 Headrest

Claims

1. a main body portion disposed above the seat back in an upright position in a rear seat that is disposed at the rear of a vehicle and that can assume a full-flat position with the seat back folded down onto a seat cushion; a detachable attachment portion that is detachably attached to a front surface of the headrest of the main body portion and that is configured to support the occupant's head from the rear side of the seat and both sides in the seat width direction when the main body portion is placed on the front surface of the headrest, and that is detachably attached to an upper surface of the headrest of the main body portion; A headrest having a

2. the detachable portion is detachably attached to the rear side of the headrest of the main body portion, and can be disposed on the rear side of the headrest of the main body portion when the seat back is folded down onto the seat cushion. The headrest of claim 1 .

3. The detachable portion is detachably attached to the underside of the headrest of the main body portion on the front side of the seat back, and is configured to support the head of the occupant from the rear side of the seat and from both sides in the seat width direction when the detachable portion is arranged on the underside of the headrest of the main body portion. The headrest of claim 1 .

4. The main body or the detachable part includes a support member having a higher rigidity than the pad of the seat back, and the support member is configured to be able to be arranged between the detachable part and the seat back in a state where the detachable part is arranged on the underside of the headrest of the main body and on the front side of the seat back. The headrest according to claim 3.

5. The support member is slidably provided on the main body portion, and is configured to be retractable into the main body portion and to be deployable below the headrest of the main body portion. The headrest according to claim 4.

6. When the detachable portion is disposed on the headrest front side of the main body portion, one end portion of the detachable portion on both sides in the seat width direction above the headrest and one end portion of the main body portion on both sides in the seat width direction above the headrest and in front of the headrest are connected by a pair of left and right first connecting members, and the detachable portion is configured to be movable between the headrest front side and the headrest upper side of the main body portion while the one end portion of the detachable portion and the end portion of the main body portion on the headrest above and in front of the headrest are connected by the first connecting members. The headrest of claim 1 .

7. When the detachable portion is disposed on the headrest front side of the main body portion, the other end portion of the detachable portion on the lower side of the headrest on both sides in the seat width direction and the end portion of the main body portion on the front side of the headrest and on the lower side of the headrest on both sides in the seat width direction are connected by a pair of left and right second connecting members, respectively. The headrest according to claim 6.

8. When the detachable portion is disposed on the headrest upper surface side of the main body portion, the other end portions of the detachable portion on both side surfaces in the seat width direction are connected to end portions of the main body portion on both side surfaces in the seat width direction above the headrest and on the rear side of the headrest by the pair of left and right second connecting members.

8. The headrest of claim 7.

9. a seat cushion that is disposed at the rear side of the vehicle and that can support the buttocks and thighs of an occupant; a seat back connected to a rear end of the seat cushion, capable of taking a full-flat position when reclined on the seat cushion, and capable of supporting the back of an occupant in an upright position; a headrest including: a main body portion disposed on an upper side of the seat back when the seat back is in an upright position; and a detachable portion that is detachably attached to a front surface of the headrest of the main body portion and configured to support the occupant's head from the rear side of the seat and both sides in the seat width direction when the main body portion is disposed on the front surface of the headrest, and that is detachably attached to an upper surface of the headrest of the main body portion; A rear seat having:

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