JP4280589B2 - Headrest - Google Patents

Description

  The present invention relates to a headrest such as a vehicle seat.

  Conventionally, in order to improve the safety at the time of a collision, a headrest rear portion fixed to the headrest stay and a headrest front portion movably connected in a direction away from the rear portion with respect to the headrest rear portion via a coupling mechanism are provided. In addition, a headrest that moves the front part of the headrest forward and holds the headrest at an appropriate position with respect to the head of the occupant has been proposed.

  For example, the headrest described in Patent Document 1 forms a parallel link by a pair of arms arranged in parallel, and the headrest front portion is separated from the rear portion of the headrest with respect to the headrest rear portion by a connecting mechanism having the parallel link as a movable portion. Connect to move in the direction. At the time of the collision, each arm rotates forward with the support portion as a rotation center, so that the headrest front portion moves forward while maintaining a positional relationship substantially parallel to the rear portion.

And by adopting such a headrest, it becomes possible to hold the headrest front part in an appropriate position with respect to the head of the occupant even at the time of the subject collision, so that the occupant's head The head can be prevented from whipping when it comes into contact with the headrest.
JP 2002-142910 A

  By the way, at the time of a collision, the passenger's torso (back) is pressed against the seat back before the passenger's head contacts the headrest. Accordingly, the seat back is bent so that the upper end of the seat back falls down toward the vehicle rear side, and the position of the headrest fixed to the headrest stay sinks relatively lower than before the collision.

  However, in the case of a conventional headrest that employs a coupling mechanism constituted by parallel links, such as the headrest described in Patent Document 1, the front portion of the headrest is moved forward while maintaining a positional relationship that is substantially parallel to the rear portion. Since it moves, there exists a problem that there exists a possibility that a headrest front part cannot be arrange | positioned in an appropriate position with respect to a passenger | crew's head.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a headrest capable of preventing the occupant's head from whipping at the time of a collision. .

In order to solve the above problems, the invention according to claim 1 is directed to a headrest rear portion fixed to a seat back via a headrest stay, and a direction away from the headrest rear portion with respect to the headrest rear portion via a coupling mechanism. And a headrest front portion movably connected to the headrest , and the headrest front portion can be held at a second position apart from each other at the time of a collision. The first arm and the second arm are connected to each other, and the first arm is connected to an upper end of the rear portion of the headrest so that one end of the first arm can rotate, and the other end of the front portion of the headrest can rotate. connected to the lower end, the second arm, the headrest rear portion of the lower end in the vertical direction extending length hole end by pivot shaft which is inserted and can rotate While being consolidated movable downwardly movably other end at pivot shaft which is inserted into the elongated hole which extends vertically to the rotatable and vertically to the upper end of the headrest front portion and gist to be consolidated.

According to a second aspect of the present invention, the coupling mechanism is coupled to the headrest rear portion in the first arm so that the headrest front portion is held in the second position in a state of being tilted forward than before the movement. The length from the connecting point with the rear portion of the headrest in the second arm to the connecting point with the front portion of the headrest is set to be longer than the length from the point to the connecting point with the front portion of the headrest, The length from the connection point between the first arm and the second arm to the connection point between the second arm and the front portion of the headrest is from the connection point of the first arm and the second arm to the front portion of the first arm and the headrest. The gist is to be configured to be longer than the length to the connection point .

(Function)
According to the first aspect of the present invention, the position of the connection point between the first arm and the front portion of the headrest is changed by the rotation of the first arm around the connection point with the rear portion of the headrest. It moves relatively upward from before the two arms are deployed. However, the position of the connection point between the second arm and the front portion of the headrest is lowered in the positional relationship with the front portion of the headrest by the rotation of the second arm around the connection point between the first arm and the second arm. In the relative comparison with the position before the movement, there is almost no change in the positional relationship in the vertical direction.

  Accordingly, in the second position, the front portion of the headrest is disposed at a position spaced forward from the rear portion of the headrest, and is lifted to the first arm by the amount that the connecting point with the second arm has moved downward. So as to move upward and be disposed relatively upward with respect to the rear portion of the headrest.

  As a result, even when the seat back is bent at the time of the collision and the headrest position sinks relatively downward, the front part of the headrest moves upward relative to the rear part of the headrest. The section is arranged at an appropriate position with respect to the passenger's head. As a result, it is possible to prevent the passenger's head from whipping at the time of the rear-end collision.

  Furthermore, since the first arm and the second arm are arranged in a crossing manner, the first arm and the second arm perform the function of “strut”. Therefore, it is possible to ensure sufficient strength against the stress acting in the direction of pushing back the front portion of the headrest when contacting the head. As a result, it is possible to reliably support the passenger's head when in contact with the passenger's head, so that it is possible to prevent the passenger's head from whipping at the time of a collision. Become.

In addition , as the pivot shaft inserted through the long hole slides in the vertical direction, the connection point between the second arm and the rear portion of the headrest and the connection point between the second arm and the front portion of the headrest move in the vertical direction. To do.

According to the invention described in claim 2 , even when the rear portion of the headrest fixed to the headrest stay is tilted rearward due to the deflection of the seat back at the time of the collision, the front portion of the headrest is placed on the head of the passenger. It is possible to make contact at an appropriate angle. As a result, it is possible to prevent the passenger's head from whipping at the time of the rear-end collision.

Further , when the headrest front part moves to the second position due to the development of the first arm and the second arm, the connection point between the second arm and the headrest front part is the first arm and the headrest front part. It moves further forward than the connecting point. Thus, the vertical orientation axis of the head rest front portion in the second position, to tilt forward from the attitude axis before moving the headrest front portion is held in a state where its upper end is inclined forward.

  ADVANTAGE OF THE INVENTION According to this invention, the headrest which can prevent that a passenger | crew's head will become a whipping state at the time of a rear-end collision can be provided.

Hereinafter, an embodiment in which the present invention is embodied in a headrest of a vehicle seat will be described with reference to the drawings.
As shown in FIG. 1, the vehicle seat 1 includes a headrest 2 and a seatback 3, and the headrest 2 is supported by a headrest stay 4 provided at an upper end portion of the seatback 3, thereby 3 is arranged above 3.

  As shown in FIGS. 2 and 3, the headrest 2 of the present embodiment is separated from the headrest rear portion 5 with respect to the headrest rear portion 5 via a headrest rear portion 5 fixed to the headrest stay 4 and a pair of X links 6. And a headrest front portion 7 connected to be movable in the direction.

  As shown in FIG. 4, each X link 6 is arranged in an X shape so that the first arm 11 and the second arm 11 are pivotally connected to each other around the connection pin 10 (connection point O, see FIG. 5). An arm 12 is provided. As shown in FIGS. 2 and 3, each X link 6 has one end of each of the first arm 11 and the second arm 12 connected to the headrest rear part 5 and the other end connected to the headrest front part 7. Thus, the headrest rear part 5 and the headrest front part 7 are connected.

  More specifically, as shown in FIG. 4, the headrest rear portion 5 includes a rear bracket 13, and the rear bracket 13 is fixed to the headrest stay 4 that extends in the headrest rear portion 5. In the present embodiment, the rear bracket 13 has a plate shape extending in the vertical direction of the headrest rear portion 5, and has side portions 14 that are folded forward at both side end portions thereof. And the rear side edge part 11a of each 1st arm 11 of each X link 6 is connected to the upper end 14a of each side part 14, and the rear side of each 2nd arm 12 is connected to the lower end 14b of the side part 14 The end 12a is connected.

  As shown in FIGS. 2 and 3, the headrest front portion 7 includes a front bracket 16 having a side surface portion 15 that is folded back in the same manner as the rear bracket 13. And the front side edge part 12b of each 2nd arm 12 of each X link 6 is connected to the upper end 15a of each side part 15, and the front of each 1st arm 11 is connected to the lower end 15b of the side part 15 The part side end part 11b is connected.

  More specifically, as shown in FIG. 4, a circular hole 17 is formed in the upper end 14 a of each side surface portion 14 of the rear bracket 13, and the rear bracket 13 is a rear fixed point inserted through these circular holes 17. A rotating shaft 19 is provided. Each of the first arms 11 is rotated about the rear fixed point rotation shaft 19 as a center (see connection point A1, FIG. 5) by the rear end 11a being pivotally supported by the rear fixed point rotation shaft 19. The rear bracket 13 is movably connected.

  Further, elongated holes 21 extending in the vertical direction are formed in the lower ends 14b of the side surface portions 14 of the rear bracket 13, and the rear bracket 13 is inserted into the elongated holes 21 and slides in the vertical direction. A rear sliding rotation shaft 23 is provided. Each of the second arms 12 has a rear side end portion 12a supported by the rear sliding rotation shaft 23 so that both the rear sliding rotation shafts 23 can move in the vertical direction and the rear sliding. It is connected to the rear bracket 13 so as to be rotatable about the rotation shaft 23 (connection point A2, see FIG. 5).

  On the other hand, as shown in FIGS. 2 and 3, a circular hole 24 is formed in the lower end 15 b of each side surface portion 15 of the front bracket 16, and the front bracket 16 is inserted into both the circular holes 24. A front fixed point rotation shaft 26 is provided. Each of the first arms 11 is supported by the front fixed point rotating shaft 26 at the front side end portion 11b, thereby centering the front fixed point rotating shaft 26 (see the connection point B1, FIG. 5). ) And is connected to the front bracket 16 so as to be rotatable.

  Further, the upper end 15a of each side surface portion 15 of the front bracket 16 is formed with a long hole 28 extending in the vertical direction, and the front bracket 16 is inserted into both the long holes 28 in the vertical direction. A front sliding rotation shaft 30 that slides is provided. And each 2nd arm 12 is movable to an up-down direction with this front sliding rotation axis | shaft 30 because the front side edge part 12b is pivotally supported by the front sliding rotation axis 30, and The front sliding pivot shaft 30 is connected to the front bracket 16 so as to be rotatable about the center (connection point B2, see FIG. 5).

  As shown in FIG. 5, in the present embodiment, each X link 6 has a length L <b> 1 from a connection point A <b> 1 with the rear bracket 13 to a connection point B <b> 1 with the front bracket 16 in each first arm 11. Also, the length L2 from the connection point A2 with the rear bracket 13 to the connection point B2 with the front bracket 16 in each second arm 12 is set to be long.

  Each X link 6 has a longer length rb2 from the connection point O to the connection point B2 than a length rb1 from the connection point O to the connection point B1 between the first arm 11 and the second arm 12. It is comprised so that it may become. In the present embodiment, the length ra1 from the connection point O to the connection point A1, the length ra2 from the connection point O to the connection point A2, and the length rb1 from the connection point O to the connection point B1 are further equal. It is comprised so that it may become.

  As shown in FIG. 4, in this embodiment, a torsion coil spring 32 is inserted into the shaft portion 31 of the connecting pin 10 a of the X link 6 a, and one end 32 a of the shaft pin 31 is engaged with the rear fixed point rotation shaft 19. The other end 32 b is locked to the front sliding rotation shaft 30. In the headrest front portion 7, the elastic force of the torsion coil spring 32 causes the rear fixed point rotation shaft 19 to be pushed rearward (right side in FIGS. 2 and 3), and the front sliding rotation shaft 30 is moved forward ( By being pressed toward the left side in FIG. 2 and FIG. 3, the headrest is always urged away from the headrest rear portion 5.

  In the present embodiment, in a normal state, the hook 33 a of the lock member 33 provided on the front sliding rotation shaft 30 is locked to the locking portion 34 provided on the rear fixed rotation shaft 19, whereby the headrest The front part 7 is held (locked) in a state integrated with the headrest rear part 5, that is, in the first position P1 shown in FIG. At the time of the collision, the solenoid 35 is operated to push up the other end 33b of the lock member 33, so that the hook 33a is released from the locking portion 34 and the lock is released. And by this unlocking, the headrest front part 7 moves in the direction away from the headrest rear part 5 by the elastic force of the torsion coil spring 32.

  The headrest 2 of the present embodiment has a stopper 38 that locks the rear sliding rotation shaft 23 that has moved in the long hole 21 with the development of the X-link 6 to be described later and restricts the return by the elastic force of the coil spring 37. It has. The headrest front portion 7 is held by the stopper 38 at a position separated from the headrest rear portion 5, that is, the second position P2 shown in FIG.

Next, the operation of the headrest of the present embodiment configured as described above will be described in detail.
As shown in FIGS. 2 and 3, when the headrest front portion 7 and the headrest rear portion 5 are unlocked by the operation of the solenoid 35 at the time of the collision, each X link 6 is moved by the elastic force of the torsion coil spring 32. The headrest front part 7 and the headrest rear part 5 are developed in a direction to separate them (see FIG. 4).

  Specifically, as shown in FIG. 6, the first fixed arm 11 is pressed by the elastic force of the torsion coil spring 32 in the direction in which the rear fixed pivot 19 and the front sliding pivot 30 are separated from each other. The second arm 12 rotates around the connection point O in a direction in which the rear side end portion 11a (12a) and the front side end portion 12b (11b) are separated from each other.

  Here, in the present embodiment, the second arm 12 includes a rear sliding rotation shaft 23 provided at the lower end of the rear bracket 13 and a front sliding rotation shaft 30 provided at the upper end of the front bracket 16. It is connected with. Accordingly, the second arm 12 moves from the lower end 21 a of the rear sliding pivot shaft 23 to the upper end 21 b in the long hole 21 and from the upper end 28 a to the lower end 28 b of the front sliding pivot shaft 30 in the long hole 28. Is rotated around the connecting point O. Then, the first arm 11 rotates toward the upper side in the drawing around the rear fixed point rotation shaft 19, that is, the connection point A <b> 1 by the rotation of the second arm 12.

  Then, by a series of operations of the first arm 11 and the second arm 12, each X link 6 is deployed, and the headrest front part 7 is separated from the headrest rear part 5 and moved from the first position P1 to the second position P2. Move (see FIGS. 2 and 3). As described above, the movement of the rear sliding rotation shaft 23 from the upper end 21b to the lower end 21a in the long hole 21 is restricted by the stopper 38 (see FIGS. 4 and 7). Is held at the second position P2.

  At this time, the position Ps2 of the connection point B1 (that is, the front fixed point rotation shaft 26) between the first arm 11 and the front bracket 16 at the second position P2 is the rear fixed point rotation shaft 19 (connection point A1). With the rotation of the first arm 11 as the center, the first arm 11 moves upward relative to the position Ps1 at the first position P1. However, the position Pm2 of the connection point B2 between the second arm 12 and the front bracket 16 is changed with the front bracket 16 by the movement from the upper end 28a to the lower end 28b in the long hole 28 of the front sliding rotation shaft 30. In the relationship, the first position P1 moves downward from the position Pm1, and therefore, in the relative comparison with the first position P1, there is almost no change in the positional relationship in the vertical direction.

  Accordingly, the headrest front portion 7 is disposed at a position spaced forward from the headrest rear portion 5 by the expansion of the X link 6 at the second position P2, and the connection point B2 with the second arm 12 is located from the position Pm1. Due to the downward movement to the position Pm 2, it moves upward so as to be lifted by the first arm 11, and is disposed relatively upward with respect to the headrest rear part 5.

  As a result, as shown in FIG. 7, when the passenger's torso is pressed against the seat back 3 at the time of the collision, the seat back 3 bends and the position of the headrest 2 sinks relatively downward. In addition, the headrest front part 7 moves relatively upward with respect to the headrest rear part 5, so that the headrest front part 7 can be disposed at an appropriate position with respect to the passenger's head.

  Further, as shown in FIG. 5, each X link 6 has a distance from the connection point O to the connection point B2 rather than the length rb1 from the connection point O to the connection point B1 of the first arm 11 and the second arm 12. The length rb2 is configured to be longer. Accordingly, as shown in FIG. 6, when the headrest front portion 7 moves from the first position P1 to the second position P2, the connection point B2 between the second arm 12 and the front bracket 16 is the first arm 11. And the front bracket 16 are moved further forward than the connection point B1. As a result, the vertical posture axis Y2 of the headrest front portion 7 at the second position P2 is inclined forward by a predetermined angle θ relative to the posture axis Y1 at the first position P1. And the headrest front part 7 is hold | maintained in the state which the upper end inclined forward.

  Therefore, as shown in FIG. 7, even when the headrest rear portion 5 fixed to the headrest stay 4 is tilted rearward due to the bending of the seat back 3 at the time of the collision, the headrest front portion 7 is moved to the passenger's head. It is possible to make contact with the part at an appropriate angle.

As described above, according to the present embodiment, the following features can be obtained.
(1) The headrest front part 7 is arranged with respect to the headrest rear part 5 via a pair of X links 6 constituted by a first arm 11 and a second arm 12 which are arranged in an X shape and are pivotally connected to each other. The headrest rear portion 5 is coupled so as to be movable away from the headrest rear portion 5.

  With such a configuration, after the X-link 6 is deployed, the first arm 11 and the second arm 12 perform the function of “mating each other”, so that the headrest front portion 7 is pushed back when contacting the head. Sufficient strength against stress can be ensured. Therefore, the passenger's head can be reliably supported when contacting the passenger's head, and as a result, the passenger's head can be prevented from whipping at the time of the collision.

  (2) The first arm 11 of each X link 6 is connected to the upper end of the rear bracket 13 so that the rear side end portion 11a can be rotated by the rear fixed point rotation shaft 19, and the front side end portion 11b is It is connected to the lower end of the front bracket 16 so as to be rotatable by a front fixed point rotation shaft 26. The second arm 12 of each X link 6 is connected to the lower end of the rear bracket 13 so that the rear side end portion 12a can be moved in the vertical direction by the rear sliding rotation shaft 23 and can be rotated. The part-side end part 12b is connected to the upper end of the front bracket 16 so as to be movable in the vertical direction and rotatable about the front sliding rotation shaft 30.

  With such a configuration, the position Ps2 of the connection point B1 between the first arm 11 and the front bracket 16 at the second position P2 due to the expansion of the X link 6 is the first around the rear fixed point rotation shaft 19. As one arm 11 rotates, it moves relatively higher than the position Ps1 at the first position P1. However, the position Pm2 of the connection point B2 between the second arm 12 and the front bracket 16 moves downward relative to the position Pm1 at the first position P1 in relation to the front bracket 16, so the first position P1. In the relative comparison with, there is almost no change in the positional relationship in the vertical direction.

  Accordingly, the headrest front portion 7 is disposed at a position spaced forward from the headrest rear portion 5 by the expansion of the X link 6 at the second position P2, and the connection point B2 with the second arm 12 is located from the position Pm1. Due to the downward movement to the position Pm 2, it moves upward so as to be lifted by the first arm 11, and is disposed relatively upward with respect to the headrest rear part 5.

  As a result, the headrest front part 7 moves relatively upward with respect to the headrest rear part 5 even when the seat back 3 bends at the time of the collision and the position of the headrest 2 sinks relatively downward. Thereby, the headrest front part 7 can be arrange | positioned in a suitable position with respect to a passenger | crew's head. As a result, it is possible to prevent the passenger's head from whipping at the time of the rear-end collision.

  (3) Each X link 6 has the rear bracket 13 in each second arm 12 longer than the length L1 from the connection point A1 with the rear bracket 13 in each first arm 11 to the connection point B1 with the front bracket 16. The length L2 from the connection point A2 to the connection point B2 to the front bracket 16 is set to be long. Each X link 6 has a longer length rb2 from the connection point O to the connection point B2 than a length rb1 from the connection point O to the connection point B1 between the first arm 11 and the second arm 12. Configure to be

  With such a configuration, when the headrest front portion 7 moves from the first position P1 to the second position P2, the connection point B2 between the second arm 12 and the front bracket 16 is It moves further forward than the connection point B1 with the front bracket 16. As a result, the vertical posture axis Y2 of the headrest front portion 7 at the second position P2 is inclined by a predetermined angle θ forward from the posture axis Y1 at the first position P1, so that the headrest front portion 7 has the upper end at the front. It is held in a tilted state.

  Therefore, even when the headrest rear portion 5 fixed to the headrest stay 4 is tilted rearward due to the deflection of the seat back 3 at the time of the collision, the headrest front portion 7 is positioned at an appropriate angle with respect to the passenger's head. Can be contacted. As a result, it is possible to prevent the passenger's head from whipping at the time of the rear-end collision.

In addition, you may change each said embodiment as follows.
In this embodiment, the connection with the rear bracket 13 in each second arm 12 is longer than the length L1 from the connection point A1 with the rear bracket 13 in each first arm 11 to the connection point B1 with the front bracket 16. The length L2 from the point A2 to the connection point B2 with the front bracket 16 is set to be long. Each X link 6 has a longer length rb2 from the connection point O to the connection point B2 than a length rb1 from the connection point O to the connection point B1 between the first arm 11 and the second arm 12. It comprised so that it might become.

  However, the configuration of each X link 6 is not limited to this, as long as the headrest front portion 7 is in a state in which the upper end thereof is tilted forward in the second position. That is, the length L1 from the connection point A1 to the connection point B1 in the first arm 11, the length L2 from the connection point A2 to the connection point B2 in the second arm 12, and the connection points A1, A2, Each length ra1, ra2, rb1, rb2 up to B1, B2 may be set in any way. In the present embodiment, the long holes 21 and 28 are extended in the vertical direction. However, by changing the shape of the long holes 21 and 28, the posture of the headrest front portion 7 in the second position can be changed. It is good also as a structure hold | maintained in the state which the upper end inclined forward.

  In the present embodiment, the headrest 2 is provided with a pair of X links 6. However, the X link 6 may be one or three or more, for example, only one side is an X link, and the other is another link. You may connect with.

Next, technical ideas other than the claims that can be grasped from the above embodiments will be described together with the effects thereof.
(A) A vehicle seat provided with the headrest according to claim 1 or 2 . Accordingly, it is possible to provide a vehicle seat that can prevent the passenger's head from being whipped at the time of a collision.

The side view of a vehicle seat. Sectional drawing of the headrest at the normal time. Sectional drawing of the headrest at the time of a rear-end collision. The perspective view of the connection part of a headrest which shows the structure of X link. The schematic diagram of the headrest which shows the structure of X link. The schematic diagram of the headrest which shows the effect | action of a headrest. Explanatory drawing which shows the effect | action of a headrest.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vehicle seat, 2 ... Headrest, 3 ... Seat back, 4 ... Headrest stay, 5 ... Headrest rear part, 6, 6a ... X link, 7 ... Headrest front part, 10, 10a ... Connecting pin, 11 ... 1st arm , 11a ... rear side end, 11b ... front side end, 12 ... second arm, 12a ... rear side end, 12b ... front side end, 13 ... rear bracket, 14 ... side part, 14a ... upper end , 14b ... lower end, 16 ... front bracket, 15 ... side part, 15a ... upper end, 15b ... lower end, 19 ... rear fixed point pivot shaft, 21 ... long hole, 21a ... lower end, 21b ... upper end, 23 ... rear sliding Rotating shaft, 26 ... front fixed point rotating shaft, 28 ... long hole, 28a ... upper end, 28b ... lower end, 30 ... front sliding rotating shaft, O, A1, A2, B1, B2 ... connection point, L1 , L2, ra1, ra2, rb1, rb2 ... length, P ... first position, P2 ... second position, Y1, Y2 ... posture axis, Pm1, Pm2, Ps1, Ps2 ... position.

Claims (2)

Comprising a head rest rear portion which is fixed to the seat back through the headrest stay, with respect to the head rest rear portion via the connecting mechanism and movably linked head rest front portion in a direction away from the head rest rear portion, said at the rear-end collision A headrest capable of holding the front portion of the headrest at a second spaced position;
The connection mechanism includes a first arm and a second arm that are arranged in an intersecting manner and are rotatably connected to each other,
The first arm is pivotally connected at one end to the upper end of the rear portion of the headrest, and the other end is pivotally coupled to the lower end of the front portion of the headrest.
Said second arm has one end at the pivot shaft is consolidated so as to be movable in rotatable and vertically inserted through the elongated hole which extends vertically to the lower end of the headrest rear, the headrest headrest the other end by pivot shaft which is inserted into the elongated hole which extends vertically to the front of the upper end is consolidated so as to be movable in rotatable and vertically, and wherein. The headrest according to claim 1,
The coupling mechanism is to be held in a state in which the front portion of the headrest is tilted forward than before the movement at the second position.
From the connection point with the headrest rear part in the second arm to the connection point with the headrest front part, rather than the length from the connection point with the headrest rear part in the first arm to the connection point with the headrest front part. The length is set to be long,
The length from the connection point of the first arm and the second arm to the connection point of the second arm and the front portion of the headrest is the length from the connection point of the first arm and the second arm to the first arm and the headrest. A headrest characterized in that the headrest is configured to be longer than the length to the connection point with the front part.

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