JPH10138814A - Headrest device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headrest device having high performance for supporting the head part of an occupant in rear collision, etc. SOLUTION: A headrest frame 40 is provided between side frames 25, 25 of a backrest frame 20. The headrest frame 40 is movable along guide parts 30, 31 from a first position toward the front part across a second position. A headrest fitting holder 50 is provided in the headrest frame 40. A support member 45 movable in the front/rear direction is provided in the rear side of the headrest frame 40. A rear member 62 and a link mechanism 70 are provided inside the backrest frame 20 and, when the rear member 62 is pushed backward, the support member 45 is advanced via the link mechanism 70 so as to advance the headrest 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headrest device mounted on a vehicle seat such as an automobile.

[0002]

2. Description of the Related Art As shown in FIG. 5, an example of an automobile seat includes a seat (seat cushion) 10 and a backrest (seatback) 11, and a headrest 12 is provided at an upper end of the backrest 11. The seat 10 is fixed to the floor 13 of the vehicle body via a seat adjuster mechanism (not shown). The headrest 12 is effective in supporting the head of the occupant M when a rear-end collision occurs with a following vehicle. However, at the time of a rear collision, the body of the occupant M is relatively pressed against the backrest 11 as shown by the arrow R1 as the seat portion 10 is pushed out in the direction of the arrow F, and the head of the occupant M faces the headrest 12. To fall.

[0003]

At the time of the rear collision as described above, the seat 10 is pushed out in the direction of arrow F,
The upper end of the backrest 11 and the upper body of the occupant M relatively tend to fall backward (in the direction of the arrow R2). In that case, the headrest 12 also moves rearward, so there is room for improvement in sufficiently supporting the head of the occupant M.
SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a vehicle headrest device having a high ability to support the head of an occupant in a rear collision or the like.

[0004]

A headrest device according to the present invention for achieving the above object is provided between a pair of left and right side frame portions of a backrest frame and has a rearward first position to a frontward second position. A front-rear slidable headrest frame movable in the front-rear direction along the guide portion and having a holder for mounting a headrest, and a back member provided movably in the front-rear direction behind the seated person below the headrest frame. And a support member provided so as to be able to support the headrest frame from the rear side and to be movable in the front-rear direction, and a back member provided between the support member and the drive body and behind the drive body. Moves in a direction to advance the support member in conjunction with the back member when is pushed rearward The headrest frame is provided with a link mechanism for advancing in the direction of the second position from the first position by the.

[0005] When the vehicle equipped with the headrest device of the present invention is hit rearward, when the body of the occupant moves rearward relative to the seat, the back member of the driving body inside the backrest is pushed by the body of the occupant. Accordingly, the support member moves in the forward direction via the link mechanism, and the headrest frame is moved forward in the direction of the second position by the support member, so that the headrest approaches the occupant's head. For this reason, the support capacity of the headrest is more fully exhibited.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1 and the like, a headrest device 21 is provided on a backrest frame 20 of an automobile seat. The backrest frame 20 is provided inside the backrest 11 similarly to the seat shown in FIG. The backrest frame 20 (only a part of which is shown) is formed by molding a metal plate or the like into a predetermined shape in the same manner as in the related art, and a pair of left and right side frame portions 25 and a horizontal direction connecting the upper end portions of the side frame portions 25 are formed. An upper frame part 26 and the like are provided. A pair of upper and lower slit-shaped guide portions 30 and 31 extending in the front-rear direction are provided at the upper end portion of the side frame portion 25. The strength of the periphery of these guide portions 30 and 31 is enhanced by a reinforcing plate 32.

[0007] A headrest frame 40 is provided between upper end portions of the pair of left and right side frame portions 25,25. The headrest frame 40 is the upper frame portion 26
, And extends in the horizontal direction along the upper frame portion 26. This headrest frame 40
Is formed by press-forming a metal plate or the like. As shown in FIG. 3, an upper plate portion 41, a lower plate portion 42, and a front plate portion 43 connecting these plate portions 41, 42 are formed in a U-shaped cross section. Is molded.

The longitudinal end portions 41a and 42a of the upper and lower plate portions 41 and 42 of the headrest frame 40, respectively.
Are inserted into the guide portions 30 and 31, respectively, and the guide portions 3
The headrest frame 40 is movable along the positions 0 and 31 from the rear first position shown in FIG. 3 to the front second position shown in FIG.

A support member 45 is provided on the back side of the headrest frame 40. This support member 45
The shaft 82 is connected to an upper link 72 of a link mechanism 70 described later.
The headrest frame 40 can be supported from the rear side and can be moved in the front-rear direction.

The headrest frame 40 is provided with a pair of left and right holders 50 for mounting the headrest. The holder 50 in the illustrated example is made of a synthetic resin material, and a base 52 of the holder 50 is inserted from above into a vertical mounting hole 51 formed in the headrest frame 40 as shown in FIG. The pair of left and right mounting holes 51 are provided in the headrest frame 40 at a predetermined pitch in advance.

The holder 50 has a through hole 55 extending in the vertical direction.
And the headrest stay 56 can be locked at a desired height by a locking mechanism (not shown). On the upper end side of the headrest stay 56, the headrest 12 including a pad, a frame, and the like is provided.

A driving body 60 extends between a pair of left and right side frame portions 25,25. The driving body 60 has a rod 61 extending in the width direction of the seat, and a plate-shaped rear member 62 provided at the center of the rod 61. The back member 62 is located inside the pad of the backrest, and when the occupant sitting on the seat is in a normal sitting posture, the back member 62 is not pushed backward and the seat is not moved as in the case of a rear collision. The back member 62 is pushed by the occupant's body when a load suddenly pushed forward is applied, and is displaced rearward. Both ends of the rod 61 are inserted into arc-shaped long holes 63 formed in the side frame portion 25.

A link mechanism 70 is provided between the support member 45 and the driving body 60. This link mechanism 70
When the back member 62 is pushed rearward, the back member 62
The support member 45 is configured to be driven in the direction of moving the support member 45 forward (in the direction of the second position) in conjunction with. The illustrated link mechanism 70 includes a drive side link 71 located on the lower side, an upper link 72 located on the upper side, an intermediate link 73 and a connecting pin 74 connecting the drive side link 71 and the upper link 72, and the like. ing.

The drive side link 71 is rotatably supported by the side frame portion 25 by a first shaft 75. The drive-side link 71 includes a first arm 71a connected to the rod 61 of the driving body 60 and a second arm 71a shorter than the first arm 71a.
It has an arm portion 71b so that the load in the X direction input from the rear member 62 can be increased and transmitted to the intermediate link 73. A biasing member 76 such as a tension spring is provided between the drive side link 71 and the side frame portion 25. The urging member 76 urges the rear member 62 in a direction in which the rear member 62 is pushed forward.

The upper link 72 is rotatably supported on the side frame 25 by a second shaft 80. The upper link 72 has a first arm 72a and a second arm 72b,
By rotating about the second shaft 80, the second arm 7
2b can move from the rearward first position shown in FIG. 3 to the frontward second position shown in FIG.

A support member 45 is provided on the upper link 72. The support member 45 is rotatably attached to the upper link 72 by a horizontal shaft 82. Even when the upper link 72 is inclined in the front-rear direction about the second shaft 80, the support member 45 is moved relative to the headrest frame 40. So that they can take the same posture.

Next, the operation of the headrest device 21 having the above configuration will be described. When the vehicle is hit back, the occupant's body is relatively pressed against the backrest. Therefore, when the rear member 62 is pushed in the X direction by the occupant's body, the drive side link 71 rotates counterclockwise around the first shaft 75 in FIG. 3 and the intermediate link 73 is pulled. , The upper link 72 rotates counterclockwise about the second axis 80. Therefore, as shown in FIG. 4, the support member 45 advances and the headrest frame 40 moves in the direction of the second position, whereby the headrest 12 advances in the direction approaching the occupant's head.

The reaction force (operating load) to the load in the X direction input to the rear member 62 can be adjusted according to the spring constant of the biasing member 76 and the like. On the other hand, the force by which the support member 45 pushes the headrest frame 40 forward (head holding load) depends on the ratio of the length of the arm portions 71a and 71b of the drive side link 71 and the length of the arm portions 72a and 72b of the upper link 72. It can be variably set according to the ratio of. The above-mentioned head holding load is
The load may be set to about two to three times the load in the X direction input to the back member 62.

[0019]

According to the present invention, the headrest can be automatically moved forward by utilizing the movement of the occupant when the occupant relatively moves rearward in a rear collision or the like.
The headrest of the occupant can be more reliably supported by the headrest. The head holding load can be easily adjusted by appropriately selecting the arm length and the like of each link constituting the link mechanism, and the load input to the back member is increased toward the headrest using the link mechanism. It is possible to communicate.

Further, by inserting a holder for mounting the headrest into a pair of left and right mounting holes previously formed at a predetermined position of the headrest frame, the holder can be precisely positioned at a predetermined pitch at a predetermined pitch without welding work. Can be assembled well. For this reason, the pitch of the holder can be accurately adjusted to the pitch of the pair of left and right headrest stays provided at a predetermined pitch in the headrest, and the vertical adjustment of the headrest stay with respect to the headrest frame can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a headrest device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a part of the headrest device shown in FIG. 1;

FIG. 3 is a side view showing the headrest device shown in FIG. 1 in a partial cross section.

FIG. 4 is a side view showing a partial cross section of an operation state of the headrest device shown in FIG. 1;

FIG. 5 is a side view showing a seat and an occupant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Seat part 11 ... Backrest 12 ... Headrest 20 ... Backrest frame 21 ... Headrest device 25 ... Side frame part 30, 31 ... Guide part 40 ... Headrest frame 45 ... Support member 50 ... Headrest mounting holder 56 ... Headrest stay 60 ... Drive Body 62: Back member 70: Link mechanism

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Zenzo Fujita 3-1-1, Sumiyoshi-cho, Anjo-shi, Aichi Prefecture (72) Inventor Yoshihisa Nakagaki 5-86, Higashiumetsubo-cho, Toyota-shi, Aichi Japan Japan 72) Inventor Akihiko Mizuno 5-86, Higashiumetsubo-cho, Toyota City, Aichi Prefecture, Japan

Claims (1)

[Claims] The headrest is mounted between a pair of left and right side frame portions of a backrest frame and is movable in a front-rear direction along a guide portion from a rearward first position to a frontward second position. A front-rear slidable headrest frame having a holder, a driver having a back member provided movably in the front-rear direction behind the occupant below the headrest frame, and a headrest frame capable of supporting the headrest frame from behind. And a support member movably provided in the front-rear direction, provided between the support member and the driving body, and interlocked with the back member when the back member of the driving body is pushed rearward. The headrest frame is moved from the first position to the second position by moving the support member in the forward direction. Vehicle headrest apparatus for a link mechanism for advancing in the direction of Jishon, characterized by comprising a.