JP2002067763A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speed actuation timing of a head rest in collision at a rear surface without deteriorating comfort in normal driving. SOLUTION: The head rest 2 is provided on a rotation shaft 12 through a rotation device 22 to be rotatable and slidable on the rotation shaft 12. A movable plate 14 is provided on the rotation shaft 12 through a rotation device 16 to be rotatable. An electromagnet 17 is disposed between the rotation devices 16 and 22, and a G-sensor 31 is connected to the electromagnet 17. Metal plates 31b and 31c in the G-sensor 31 are apart from each other in normal driving, and they are applied by impact at collision of a vehicle. The electromagnet 17 is thus energized, and the rotation device 22 is coupled with the rotation device 16 by magnetic force, thereby the head rest 2 is integrally rotated with the movable plate 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat and, more particularly, to a vehicle seat capable of reducing an impact on an occupant in a rear collision.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. H10-138814 discloses a type of shock absorber for reducing the impact at the time of a rear-side collision. In the seat described in this publication, a movable plate (rear member) is provided on a seat back that supports the back of the occupant so as to be movable in the front-rear direction, and a headrest that supports the head of the occupant is provided so as to be movable in the front-rear direction via a frame. . Then, both are connected by a link mechanism or the like so that the headrest moves forward when the movable plate moves backward. Thus, when a pressing force due to inertial force acts on the movable plate from the back of the occupant during a rear collision, the headrest moves forward, and the occupant's head is supported by the headrest early.

[0003]

Although such a movable headrest is effective for supporting the occupant's head early, the movable plate is moved closer to the surface of the seat back in order to advance the operation timing. It is necessary to drive the movable plate immediately upon collision. Further, in order to prevent the headrest from inadvertently moving during normal operation, it is necessary to provide the link mechanism with a certain degree of rigidity by means of a spring or the like to restrict the free movement of the movable plate. However, if the position of the movable plate is brought closer to the surface of the seat back, or if the link mechanism is made rigid, the occupant may feel uncomfortable on the back,
It has not been easy to advance the timing of headrest activation without compromising comfort.

[0004] It is an object of the present invention to provide a vehicle seat that can advance the operation timing of a headrest at the time of a collision of a vehicle without impairing normal comfort.

[0005]

A description will be given with reference to the drawings showing an embodiment. (1) As shown in FIGS. 1, 2, 5, 7, and 10, the invention of claim 1 is configured to include a seat back 1 that supports the back of the occupant and a headrest 2 that supports the head of the occupant. Applicable to vehicle seats. And seat back 1
An occupant support member 14 provided at a position corresponding to the back of the occupant, a pivot shaft 12 extending in the vehicle width direction above the seat back frame forming the seat back 1, and a pivot shaft 12. First supporting the headrest 2 so that it can rotate freely
Support members 22, 41, 61, 91, and second support members 16, 42, 62, 92 for rotatably supporting the occupant support member 14 with respect to the rotation shaft 12, and the occupant support member during normal times. 1
The first support members 22, 41, 61, and 91 are released from the second support members 16, 42, 62, and 92 so that the headrest 2 can move relative to the headrest 2. Connecting means 17, 18, for connecting the first support members 22, 41, 61, 91 and the second support members 16, 42, 62, 92 so that the and the occupant support member 14 rotate integrally.
43, 63, 64 and 94 achieve the above-mentioned object. (2) The invention according to claim 2 is the vehicle seat according to claim 1, wherein at least one of the first support members 22, 41 and the second support members 16, 42, as shown in FIGS. Are provided so as to be movable, and the coupling means 17, 18, 43
Moves the support members 22 and 41 during the collision of the vehicle so that the first support members 22 and 41 and the second support members 16 and 42
Are combined. (3) According to a third aspect of the present invention, in the vehicle seat according to the second aspect, as shown in FIG. 2, the vehicle seat includes a detecting unit 31 for detecting a collision of the vehicle, and the coupling unit includes a first support member. 2
An electromagnet 17 formed on one of the second and second support members 16 and magnetized when a vehicle collision is detected by the detection means 31; and a first support member 22 and a second And a magnetic body 18 formed on one of the other support members 16. (4) According to the invention of claim 4, in the vehicle seat according to claim 2, as shown in FIG. 5, the coupling means 43 can move the first support member 41 and / or the second support member that can move. 42, and is a linear member stretched inside the seat back 1. (5) According to a fifth aspect of the present invention, in the vehicle seat according to the first aspect, as shown in FIGS.
Connecting devices 63, 6 that are driven at the time of a vehicle collision and connect the first support members 61, 91 and the second support members 62, 92.
4,94. (6) According to the invention of claim 6, in the vehicle seat according to claim 5, as shown in FIG. 7, the connecting device is provided with a first support by an impact load acting on the seat back 1 at the time of collision of the vehicle. It comprises engagement members 63 and 64 driven to engage the member 61 and the second support member 62. (7) According to the invention of claim 7, in the vehicle seat according to claim 5, as shown in FIG. 9, a detecting means 98 for detecting a collision of the vehicle, and a collision of the vehicle is detected by the detecting means 98. And driving means 96 and 97 for driving the connecting device 94
And (8) According to an eighth aspect of the present invention, in the vehicle seat according to the third or seventh aspect, the detecting means 31, 98 is a G sensor whose contact is closed by an inertial force at the time of a vehicle collision. .

[0006] In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0007]

According to the present invention, the following effects can be obtained. (1) According to the first aspect of the present invention, the first support member for supporting the headrest and the second support member for supporting the occupant support member in the seatback are provided rotatably about the rotation axis. Normally, the first support member is released from the second support member and the first support member is connected to the second support member at the time of a vehicle collision, so that the occupant support member is provided on the seat back surface. However, the resistance at normal times does not increase so much. As a result, the operation timing of the headrest at the time of collision of the vehicle can be advanced without impairing the normal comfort. (2) According to the second aspect of the present invention, the first support member or the second support member is moved at the time of collision, and the first support member and the second support member are connected by frictional force. The structure of the lock mechanism is easy. (3) According to the third aspect of the present invention, an electromagnet is formed at the time of collision and the first support member and the second support member are coupled by the magnetic force. And the range of application is expanded. (4) According to the invention of claim 4, the linear member is stretched in the seat back, and the first support member and the second support member are connected by the pressing force from the occupant acting on the linear member. Therefore, a large coupling force can be obtained at the time of collision. (5) According to the invention of claim 5, since the first support member and the second support member are connected via the connection device, they are securely connected without slippage. (6) According to the invention of claim 6, since the first support member and the second support member are coupled by the engagement member driven by the impact load, the engagement member detects the collision of the vehicle. In addition, a lock mechanism is configured, and the number of parts is saved. (7) According to the seventh aspect of the present invention, since the connecting device is driven by the driving means, the timing at which the first support member and the second support member are joined can be easily adjusted. (8) According to the invention of claim 8, since the collision of the vehicle is detected by the G sensor whose contact is closed by the inertial force, if the G sensor is used as a switch of the output circuit of the control signal, the vehicle can be used. The first support member and the second support member can be connected simultaneously with the collision.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. -First Embodiment- FIG. 1 is a perspective view showing a configuration of a vehicle seat according to a first embodiment of the present invention. The vehicle seat includes a seat cushion for supporting the buttocks of the occupant, a seat back for supporting the back, a headrest for supporting the head, and the like. The seat back 1 is shown with the skin and the urethane cushion removed.

As shown in the figure, the seat back 1 includes a pair of left and right side frames 10L, 10R (seat back frames). The lower portions of the side frames 10L and 10R are connected by a lower beam 11, and the upper end portion is a rotating shaft 1.
2 are connected. Above the lower beam 11, an S-spring 13 for supporting the occupant's waist is stretched.
A movable plate 14 (occupant support member) that supports the back of the occupant is disposed above the occupant. The movable plate 14 is adhered to the back surface of the skin of the seat back 1, and is rotated with respect to the rotating shaft 12 via a pair of left and right arms 15 (second support member) and a rotation device 16 (coupling means) such as a bearing. It is movably supported. A known reclining mechanism is provided at the base end of the seat back 1, and the seat back 1 is rotatable with respect to the seat cushion.

The headrest 2 includes a pair of left and right arms 21.
(First support member) and a rotating device 22 such as a bearing
It is rotatably supported on the rotating shaft 12 via (coupling means). The arm 21 or the rotation device 22 includes:
A stopper mechanism configured to prevent the headrest 2 from rotating backward more than a predetermined amount is provided, whereby the headrest 2 can rotate forward of the vehicle. The rotating devices 16 and the rotating devices 22 are alternately arranged on the rotating shaft 12. A G sensor 31 (means for detecting a collision of a vehicle) is installed on the lower side surface of the side frame 10R, and a pair of wires 32, 33 extending from the G sensor 31 are connected to the on-vehicle battery 34 and the rotating devices 16, 22, respectively. ing.

FIG. 2 is an enlarged view in the vicinity of the rotating devices 16 and 22. FIG. 2A shows a normal state.
FIG. 2B shows a state at the time of a rear collision.
As shown in FIG. 2A, the rotation device 1
6 and the rotation device 22 are spaced apart by a predetermined amount in the axial direction. The rotating device 16 has its axial position restricted by a stopper or the like. On the other hand, the rotation device 22 is slidable along the rotation shaft 12. Note that, for example, the arm 21
Is provided with a weak spring 23 supported by the frame 10L, and the rotating device 22 is moved by this spring force until the rotating device 22 comes into contact with a stopper 12a fixed to the rotating shaft 12, whereby the initial position of the rotating device 22 is adjusted. Is stipulated.

A solenoid 17 constituting an electromagnet is provided at the left end of the rotating device 16, and a magnetic body 18 such as iron is provided at the right end of the rotating device 22 facing the solenoid 17. A wiring 33 is connected to the solenoid 17, and an electromagnet is formed by energizing the solenoid 17. As a result, a magnetic force is generated at the end of the rotating device 16 so as to attract the rotating device 22. The magnetic force is a value much larger than the spring force of the spring 23.

A sphere 31a is provided inside the G sensor 31, and two metal plates 31 are provided behind the sphere 31a.
b, 31c are spaced apart. Metal plate 3
The wiring 33 is connected to 1b, and the wiring 32 is connected to the metal plate 31c. When a forward impact load is applied to the vehicle, the sphere 31a moves rearward due to inertial force, whereby the metal plate 31b is pushed and the metal plates 31b and 31c come into contact with each other. That is, G
The contact of the sensor 31 is closed.

The operation of the first embodiment configured as described above will be described. In the initial state, the metal plates 31b and 31c are separated, the solenoid 17 is not energized,
As shown in FIG. 2A, the rotation devices 16 and 22 are kept separated from each other. In this state, FIG.
As shown in (2), each time the occupant leans on the seat back 1, the pressing force causes the movable plate 14 on the seat back surface to move backward, but the headrest 2 does not move. Since the movable plate 14 moves alone, there is no need to provide a spring or the like for restricting the movement of the movable plate 14 unlike the prior art, and the occupant hardly feels any resistance on the back.

At the time of a rear collision, the occupant tends to remain on the spot while the host vehicle suddenly moves forward, and the occupant is pressed against the seat back 1 by inertia. At this time, the sphere 31a of the G sensor 31 also moves rearward due to the inertial force. As a result, the metal plates 31b and 31c come into contact with each other, and the solenoid 17 is excited by electromotive force from the battery 34 to form an electromagnet. By the action of the electromagnet, the rotating device 22 moves rightward and comes into contact with the rotating device 16 as shown in FIG. 2B, and the two are coupled by the magnetic force and the frictional force. Thereby, the movable plate 14
And the headrest 2 rotate integrally with the rotation shaft 12,
The headrest 2 moves forward by the backward movement of the movable plate 14. In this case, since the movable plate 14 is disposed on the seat back surface, the operation timing of the headrest 2 is advanced.

As described above, in the first embodiment, the movable plate 14 and the headrest 2 are connected to the rotating devices 16 and
The rotation device 22 is provided so as to be rotatable with respect to the rotation shaft 12 via the rotation shaft 22, and the rotation device 22 is provided so as to be slidable with respect to the rotation shaft 31. Normally, the rotating device 16 is released from the rotating device 22 to rotate the rotating device 16 alone. At the time of a rear collision, the rotating devices 16 and 22 are connected to each other by an electromagnet to rotate the rotating devices 16 and 22 integrally. I did it. Thus, unlike the related art, the movable plate 14 and the headrest 2 do not always move at the same time. Therefore, it is not necessary to provide a spring or the like to prevent the headrest 2 from being inadvertently rotated due to the rotation of the movable plate 14. In addition, even if the movable plate 14 is provided on the seat back surface, the resistance does not increase so much. As a result, the occupant does not feel uncomfortable, and comfortable seating is ensured. Also,
By providing the movable plate 14 on the seat back surface,
At the time of a rear collision, the movable plate 14 is immediately pushed, so that the operation timing of the headrest 2 can be advanced.

As for a mechanism (locking mechanism) for connecting the rotation device 16 and the rotation device 22, the solenoid 17 is energized to magnetize when the rear surface collides, and the rotation device 22 is moved by the magnetic force to be connected to the rotation device 16. As a result, the operation of the lock mechanism can be controlled by processing on the electric signal. As described above, by electrically controlling the operation of the lock mechanism, the G sensor 3 used in the present embodiment can be used.
The rear collision can be detected by various sensors other than 1 and the operation can be controlled. For example, a limit switch may be provided inside the seat, and the electromagnet may be operated by turning on the limit switch by deformation of the S spring 13.
Further, since the rotating device 16 and the rotating device 22 are coupled by a frictional force, the configuration is easy.

In the present embodiment, since the rear surface collision is detected by the G sensor 31 and the lock mechanism is operated by the detection signal, it is not necessary to interpose a controller or the like, and the configuration is easy. Further, the rotating devices 16 and 22 can be connected simultaneously with the collision of the vehicle. In addition, if the G sensor 31 for the rear collision is shared with the one for the front collision, the number of parts can be reduced, and
After the frontal collision, the headrest 2 can be moved forward when the occupant rebounds to the seat back 1. The G sensor 31 may be attached to the vehicle body, but by attaching the G sensor 31 to the side frame 10R as in the present embodiment, when the seat back 1 is tilted backward, the metal plates 31b and 31c are moved by the movement of the sphere 31a. , The operation timing of the lock mechanism can be advanced. Thus, in general, when the seat back is tilted rearward, the distance between the back of the occupant and the headrest 2 increases, but the operation timing of the lock mechanism is advanced, which is more effective. Further, a spring may be provided on the movable plate 14, and the spring may adjust the amount of displacement of the movable plate 14 with respect to the pressing force, that is, the spring rigidity. The spring stiffness in this case may be determined in consideration of ride comfort.

-Second Embodiment- A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a perspective view of a vehicle seat according to the second embodiment, and FIG. 5 is an enlarged view near a rotating device 41 supporting the headrest 2 and a supporting member 42 supporting the movable plate 14. FIG. 5A shows a normal state.
FIG. 5B shows a state at the time of a rear collision.
4 and 5, the same portions as those in FIG. 1 are denoted by the same reference numerals, and the differences will be mainly described below.

In the second embodiment, a wire 43 (linear member) is stretched in the left and right horizontal direction near the S spring 13. One end of the wire 43 is connected to the side frame 10R.
The other end of the wire 43 extends upward through the inner surface of the side frame 10L, passes through the inside of a cylindrical rotating shaft 44, and is fixed to the rotating device 42. I have. The rotation devices 41 and 42 are rotatably supported by a rotation shaft 44, respectively. The rotation device 42 has its axial position restricted by a stopper or the like.
4 is slidable. The right side surface of the rotating device 42 and the left side surface of the rotating device 41 are each formed in an uneven shape, and the surface of the uneven portion is a conical surface. Wire 43
The mounting position of the is adjusted so as not to bend backward during normal operation.

The vehicle seat according to the second embodiment operates as follows. During normal operation, as shown in FIG. 5A, the rotation device 41 and the rotation device 42 are arranged apart from each other by a predetermined distance. As a result, the movable plate 14 provided on the seat back surface rotates independently of the headrest 2 by the pressing force from the occupant. Therefore, the resistance acting on the movable plate 14 is small, and the occupant does not feel uncomfortable.

At the time of a rear collision, the inertia force from the occupant acts on the seat back 1, and the seat back 1 is pushed more strongly than during normal operation. As a result, the wire 43 is pushed rearward, and as shown in FIG. 5B, the rotating device 41 is pulled to the left in the drawing, and is connected to the rotating device 42 by frictional force. As a result, the headrest 2 and the movable plate rotate integrally, and the headrest 2 moves forward.

As described above, in the second embodiment, the wire 43 is arranged in the seat back 1, the rotating device 41 is fixed to the wire 43, and the rotating device 41 is moved by deformation of the wire 43 at the time of a rear collision. And the rotating devices 41 and 42 are connected. Thereby, even if the movable plate 14 is arranged on the seat back surface, the occupant does not feel uncomfortable, and the operation timing of the headrest 2 can be advanced at the time of a rear collision. In addition, since the rotating devices 41 and 42 are coupled by the pressing force at the time of the rear collision without using an electric signal, a large coupling force can be obtained. Further, since the contact surfaces of the rotating devices 41 and 42 are formed in a conical shape, the contact area is increased, and the coupling force due to frictional force can be further increased. In this case, if the contact surface is roughened to increase the friction coefficient, the coupling force is further increased.

Note that an elastic member such as a spring may be provided instead of the wire 43. Thereby, the displacement amount of the seat back 1 due to the pressing force of the occupant can be set to a different value. In addition, the wire is fixed not only to the rotating device 41 but also to the rotating device 42 so that the rotating device 41,
42 may be moved closer together. Thereby, the coupling force between the rotating devices 41 and 42 is further increased.

Third Embodiment A third embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a perspective view of a vehicle seat according to the third embodiment. The same portions as those in FIG. 1 are denoted by the same reference numerals, and the differences will be mainly described below. In the third embodiment, a rotating device 61 that supports a headrest
(Engaging member) and a rotating device 62 supporting the movable plate
An (engaging member) is provided at the same position in the axial direction, and its axial position is restricted by a stopper or the like. Rotating device 6
Details of 1, 62 will be described with reference to FIG.

FIG. 7A is a diagram showing a state where the rotating devices 61 and 62 are assembled, FIG. 7B is a diagram showing a condition where the rotating devices 61 and 62 are disassembled, and FIG. FIG. As shown in FIG. 7, the rotating device 62 is loosely inserted inside the rotating device 61, and the rotating shaft 12 is
2 so as to form a so-called double cylinder structure. A notch 61a is provided in the lower part of the rotating device 61 along the circumferential direction, and the notch 61a is provided in the notch 61a.
5 is inserted, and the rotating device 62 is relatively movable in the circumferential direction with respect to the rotating device 61. The inner peripheral surface 61b of the rotating device 61 is formed on unevenness. The rotating device 62 is provided with a groove 62a extending from the outer peripheral surface to the center.
Is located lower toward the center. A sphere 63 is provided in the groove 62a so as to be movable along the groove 62a. A claw 64 that is rotatable around a rotation shaft 64a is attached to the outer peripheral surface of the rotating device 62, and the claw 64 covers the groove 62a. The sphere 63 moves in accordance with the pressing force of the movable plate 14 as described later.
The groove shape is set so that the sphere 63 does not contact the claw 64 during normal operation.

The vehicle seat according to the third embodiment operates as follows. When the occupant leans on the seat back 1 during normal operation, the rotating device 62 rotates as shown in FIG. Due to the rotation of the rotation device 62, the sphere 63 moves on the groove 62 a from the center of the rotation device 62 to the outer periphery, but the sphere 63 does not reach the claw 64. As a result, the pawl 64 remains in contact with the outer peripheral surface of the rotating device 62, and the rotating device 62 moves relatively to the rotating device 61.

At the time of a rear collision, an impact load acts on the seat back 1 due to the inertial force from the occupant. As a result, the rotating device 62 rapidly rotates, and as shown in FIG.
The sphere 63 moves to the groove end by the centrifugal force of the rotating device 62 and pushes up the claw 64. As a result, the pawl 64 engages with the concave portion 61b of the rotating device 61, the movable plate 14 and the headrest 2 rotate integrally, and the headrest 2 moves forward. When the rotation amount of the rotation device 61 increases,
The height of the end of the groove 62a decreases, and the sphere 63 falls by gravity. Therefore, the engagement of the claw 64 is maintained even if the centrifugal force decreases with the passage of time.

As described above, in the third embodiment, the sphere 63 that moves by centrifugal force is provided inside the rotation device 62, and the sphere 63 is moved by the rotation of the rotation device 62 when an impact load is applied. Since the claw 64 is driven by the movement of the sphere 63 and the rotating devices 61 and 62 are engaged,
Even if the movable plate 14 is arranged on the surface of the seat back, the occupant does not feel uncomfortable and can accelerate the operation timing of the headrest 2 at the time of a rear collision. in this case,
The sphere 63 detects the rear collision and uses the rotating device 6.
Since it is a part of the lock mechanism that engages 1,62, the number of parts is saved. In addition, the rotating device 6
Since 1,62 are joined, a large joining force can be obtained without slippage.

-Fourth Embodiment- A fourth embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a perspective view of a vehicle seat according to the fourth embodiment, and FIG. 10 is a rotation device 91 that supports the headrest 2 and a rotation device 92 that supports the movable plate 14.
It is an enlarged view in the vicinity of. In the fourth embodiment, the rotating devices 91 and 92 have a symmetrical shape, and
Shows only one of them (left side). The same portions as those in FIG. 1 are denoted by the same reference numerals, and the differences will be mainly described below. As shown in FIGS. 9 and 10, the rotation device 91 is disposed on the left and right sides in the axial direction relative to the rotation device 92, and their axial positions are restrained by stoppers or the like. A gear 94 (coupling device) is screwed onto the peripheral surface of the rotating shaft 93, and when the rotating shaft 93 is rotated in a state where the rotation of the gear 94 is restricted, the gear 94 moves relative to the rotating shaft 93 in the axial direction. It is designed to move. Gears 91a, 92a (coupling device) on the inner peripheral surfaces of the rotating devices 91, 92 so as to mesh with the gear 94.
Are formed. Behind the arm 21, the frame 10
A stopper 95 supported from L is provided, and the stopper 95 regulates the backward rotation of the headrest 2.

An electric motor 96 (drive means) is provided at an end of the rotating shaft 93. A driving device 97 (driving means) for outputting a driving command to the motor 96 is connected to the electric motor 96, and a detector 98 (for example, a G sensor) for detecting a rear collision is connected to the driving device 97. Detector 98
When the rear collision is detected, a driving signal is output from the driving device 97 to the electric motor 96, and the electric motor 96 rotates by a predetermined amount. As a result, the rotating shaft 93 rotates, and the gear 94 moves by a predetermined amount. The rotating shaft 93 is formed with a reverse screw at the center of the left and right sides so that the rotating devices 91 and 92 move to the left and right outside or the left and right inside by rotating the rotating shaft 93.

The vehicle seat according to the fourth embodiment operates as follows. During normal operation, as shown in FIG. 11A, the axial position of the gear 94 is set so that only the gear 94 and the gear 91a of the rotating device 91 mesh with each other. Accordingly, the rotation device 91 rotates together with the gear 94 independently of the rotation device 92.

When the detector 98 detects a rear collision, a driving command is output from the driving device 97 and the electric motor 96 rotates. As a result, as shown in FIG. 11B, the gear 94 moves to the left in the axial direction, meshes with both the gears 91 and 92, and the rotating devices 91 and 92 are connected via the gear 94. As a result, the movable plate 14 and the headrest 2 rotate integrally, and the headrest 2 moves forward. The electric motor 96 stops rotating after a predetermined rotation, and the rotating device 91,
The combined state of 92 is maintained as it is.

As described above, according to the fourth embodiment, the gears 91a, 92a, 94 are formed on the inner peripheral surfaces of the rotating devices 91, 92 and the rotating shaft 93, respectively, and the gear 94 is driven by the electric motor 2. The occupant does not feel uncomfortable even if the movable plate 14 is disposed on the seat back surface because the rotator 91 is moved to couple the rotator 91 and the rotator 92 via the gear 94. The operation timing can be advanced. In addition, by controlling the driving of the electric motor 2, the timing at which the rotating devices 91 and 92 are coupled can be easily adjusted.

The detector 98 does not detect a rear collision, but may detect, for example, a vehicle collision in advance. Thus, the lock mechanism is activated immediately before the vehicle collision, and the headrest 2 can be moved forward without delay at the time of the vehicle collision. Alternatively, the locking mechanism may be activated when the vehicle starts moving and the occupant's posture is stabilized, and the locking mechanism may be released when the vehicle stops and the engine is turned off. Instead of the electric motor 96, an actuator such as an explosive inflator may be used. Further, the tip of the gear 94 may be formed in a triangular pyramid shape to facilitate meshing with the gear 92a.

In the correspondence between the above embodiment and the claims, the movable plate 14 serves as the occupant support member, the rotating devices 22, 41, 61, 91 serve as the first support members, and the rotating devices 16, 42, 62 and 92 are the second support member, the solenoid 17 and the magnetic body 18 or the wire 43 or the sphere 63 and the pawl 64 or the gear 94 are the coupling means, the G sensor 31 or the detector 98 is the detection means, and the wire 43 is the wire. The spherical member 63 and the claw 64 or the gear 94 constitute the connecting device, and the electric motor 96 and the driving device 97 constitute the driving means.

[Brief description of the drawings]

FIG. 1 is a perspective view of a vehicle seat according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a rotating device constituting the vehicle seat according to the first embodiment.

FIG. 3 is a diagram illustrating the operation of the vehicle seat according to the first embodiment.

FIG. 4 is a perspective view of a vehicle seat according to a second embodiment of the present invention.

FIG. 5 is an enlarged view of a rotating device constituting a vehicle seat according to the second embodiment.

FIG. 6 is a perspective view of a vehicle seat according to a third embodiment of the present invention.

FIG. 7 is an enlarged view of a rotating device constituting a vehicle seat according to a third embodiment.

FIG. 8 is a diagram illustrating an operation of a vehicle seat according to a third embodiment.

FIG. 9 is a perspective view of a vehicle seat according to a fourth embodiment of the present invention.

FIG. 10 is an enlarged view of a rotating device constituting a vehicle seat according to a fourth embodiment.

FIG. 11 is a diagram illustrating the operation of a vehicle seat according to a fourth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Seat back 2 Headrest 12 Rotating shaft 14 Movable plate 16, 22, 41, 42, 61, 62, 91, 92 Rotating device 17 Solenoid 18 Magnetic body 31 G sensor ya 63 Spherical body 64 Claw 94 Gear 96 Electric motor 97 Drive 98 Detector

Claims (8)

[Claims] 1. A vehicle seat including a seat back supporting a back of an occupant and a headrest supporting a head of the occupant, wherein the occupant is provided at a position corresponding to the back of the occupant in the seat back. A support member, a pivot shaft extending in a vehicle width direction above a seatback frame forming the seatback, and a first support member rotatably supporting the headrest with respect to the pivot shaft. A second support member that rotatably supports the occupant support member with respect to the rotation axis; and a first support member that normally allows the occupant support member to move relative to the headrest. Second support member
And a coupling means for coupling the first support member and the second support member such that the headrest and the occupant support member rotate integrally when the vehicle collides with the vehicle. Vehicle seat. 2. The vehicle seat according to claim 1, wherein at least one of the first support member and the second support member is movably provided, and the coupling unit is provided when the vehicle collides. The vehicle seat is configured to move the first support member and the second support member. 3. The vehicle seat according to claim 2, further comprising detection means for detecting a collision of the vehicle, wherein the coupling means is provided on one of the first support member and the second support member. An electromagnet formed and magnetized when a vehicle collision is detected by the detection means; and a magnetic body formed on one of the first support member and the second support member corresponding to the electromagnet. A vehicle seat comprising: 4. The vehicle seat according to claim 2, wherein the coupling unit is connected to the movable first support member and / or the second support member, and is stretched in the seat back. A vehicle seat characterized by being a linear member. 5. The vehicle seat according to claim 1, wherein the coupling unit includes a coupling device that is driven during a collision of the vehicle and couples the first support member and the second support member. A vehicle seat characterized by the above-mentioned. 6. The vehicle seat according to claim 5, wherein the connecting device engages the first support member and the second support member by an impact load acting on the seat back at the time of a vehicle collision. A vehicle seat comprising an engaging member driven to perform the driving. 7. The vehicle seat according to claim 5, further comprising: detecting means for detecting a collision of the vehicle; and driving means for driving the connecting device when the collision of the vehicle is detected by the detecting means. A vehicle seat characterized by the above-mentioned. 8. The vehicle seat according to claim 3, wherein the detection means is a G sensor whose contact is closed by an inertia force at the time of a vehicle collision.