JP2003127741A - Seat structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable protection enhancement of a head part and a neck part of a sitting person in rear collision or the like without provoking complication of constitution or weight increase or the like of a head rest. SOLUTION: The head rest 12 is assembled on a seat back 14 through a rotation supporting point (hinge shaft) 18 arranged in the seat back 14, and held at a normal support position thereof by engagement of an engaging means 50. The head rest 12 is forward rotated from the normal support position to an emergency support position by inertia movement of a weight body 46 accompanying occurrence of rear collision impact, enforcedly held at the emergency support position by automatic lock operation of a lock means 52, and can be arbitrarily restored from the emergency support position to the normal support position by lock releasing operation due to a lock releasing means 66.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat structure provided with a headrest on the upper part of a seatback, the headrest being capable of protecting the head of a seated person from an impact such as a rear impact.

[0002]

2. Description of the Related Art For example, when a so-called rear impact such as a collision at the time of backward movement of a vehicle or a rear-end collision with the rear portion of the vehicle occurs, the head of a seated person tends to lean backward suddenly due to its inertial force. To do. Such a sudden backward tilt of the head is called a whiplash movement, and this whiplash movement may damage the neck of the seated person.Therefore, by suppressing this whiplash movement, the neck is prevented from being damaged. Various possible configurations are provided in seats of automobiles and the like.

As such a seat capable of suppressing the whipping motion, for example, there is a structure having a so-called movable headrest in which the headrest is forcibly rotated or slid forward from its normal supporting position. Are known.

As this type of seat structure having a movable headrest, for example, the structure disclosed in Japanese Patent Laid-Open No. 09-315196 can be exemplified.

In this known structure, the headrest is provided so as to be rotatable forward and backward or slidable forward and backward with respect to the upper end of the stay. In addition, this known configuration is such that, when a rear impact is input, the headrest moves forward (rotates, slides) along with the inertial movement of the inertial mass body (weight body) built in the headrest. The gap between the head and the head, that is, the backward tilting range of the head, is narrowed instantaneously, and the whip movement is suppressed by the increased support capacity, thereby enhancing the protection of the head and neck of the seated person. It is something to try.

[0006]

By the way, in the known configuration disclosed in the above-mentioned Japanese Patent Laid-Open No. 09-315196,
The headrest can rotate with respect to the upper end of the stay,
Alternatively, they are provided so that they can be slid.

However, since the upper end of the stay is located inside the headrest, in the former case, the rotation fulcrum is located inside the headrest. In this way, when the pivot of the headrest is located inside the headrest, the radius of rotation of the headrest tends to be small, and there is no particular effect at its normal support position located at the rear, but the occurrence of a rear impact. At this time, the headrest pivots forward from its normal support position,
In other words, when tilted forward, the cushion surface of the headrest, which is premised on the contact of the head of the seated person, is largely tilted downward due to the forward tilt.

In such a posture of the headrest in which the cushion surface is largely inclined downward, the head of the seated person is naturally brought into contact with the upper end portion of the headrest. Even if the vehicle tilts (rotates) to its front position, it is unavoidable that the support ability of the headrest slightly decreases.

For example, if the shape of the headrest is adapted to the forward tilted posture, it is possible to sufficiently prevent such a decrease in the supporting ability when a rear collision occurs. However, since the shape of the headrest tends to be uncomfortable, it is unavoidable that the appearance quality of the seat deteriorates. Further, since it is undeniable that the supporting ability in the normal supporting position may be adversely affected, it is difficult to say that such a change in the shape of the headrest is effective in every sense.

On the other hand, if the headrest is slid forward as in the latter case, the inclination of the cushion surface unlike the forward inclination does not occur, so that the supporting ability can be maintained sufficiently high. However, in this known structure, since the headrest is slid with respect to the upper end of the stay located inside the headrest, the sliding mechanism is naturally built in the headrest.

That is, in the latter type of construction in which the headrest is slid forward, the mechanism portion and the like inside the headrest are likely to be increased in size, and the headrest itself is increased in size and the cushion surface is narrowed. There is no denying the possibility of causing.

Further, in this known construction, an inertial mass body (weight body) for detecting an impact such as a rear collision is built into the headrest regardless of whether the headrest is rotated forward or slid forward. In other words, in this known configuration, the weight of the headrest itself is inevitable, and the rigidity of the stay supporting the headrest is strengthened,
Since it is necessary to enhance the holding power of the stay with respect to the seat back, it is possible that the overall structure of the stay is complicated.

The present invention provides a vehicle seat structure capable of strengthening the protection of the head and neck of a seated person at the time of a rear-end collision or the like without inviting a complicated structure or an increase in weight of a headrest. Has an aim.

[0014]

In order to achieve this object, according to the invention as set forth in claim 1, the headrest is defined in a normal supporting position located rearward and in front of the normal supporting position. In addition, it can be pivoted back and forth between the emergency support position, which is the support position in case of an emergency, and is assembled to the seat back through the pivoting fulcrum arranged in the seat back, and the inertial load caused by the rear impact impact. The headrest is held at its normal supporting position by the engagement of the engaging means with the engaging force as a reference.

Then, a weight body having a predetermined weight is rotatably arranged and connected integrally with the headrest at a position below the rotation fulcrum so that an inertial load exceeding the engaging force of the engaging means is applied. When the weight body is generated by a rear impact, the headrest is rotated forward in the direction of the emergency support position in front of the normal support position under the inertial movement of the weight body accompanied by the forced release of the engaging means. When the headrest reaches the emergency support position, the headrest is forcibly held in the emergency support position under the lock of the locking means capable of automatic locking operation.

Further, the lock releasing means is provided so as to be interlockable with the lock means and operable from the outside of the seat back. By the lock releasing operation of the lock releasing means by the lock releasing means at the emergency support position of the headrest. The vehicle seat structure is configured so that the headrest can be arbitrarily returned from the emergency support position to the normal support position.

According to a second aspect of the present invention, a pair of left and right hinge brackets are rotatably connected to the upper end of the seat back frame that forms the skeleton of the seat back.
The swing fulcrum in claim 1 is embodied as a supported hinge shaft extending in the lateral direction of the seat. Then, the weight body can be integrally rotated with the headrest at a position below the hinge shaft.
By integrally connecting and fixing via a hanging shaft, the weight body and the headrest are integrally pivoted.

Further, according to a third aspect of the present invention, a substantially fan-shaped lock plate whose arcuate circumferential surface serves as a guide surface is fixedly arranged at one end of the hinge shaft so as to be integrally rotatable with the hinge shaft. In addition, the lock claw is movably arranged on the hinge bracket so as to be capable of sliding contact with the guide surface of the lock plate under the biasing force of the lock spring. Then, it can be the engaging means in combination with the lock claw, and can be the locking means in combination with the engagement of the lock claw, the engaging recessed portion as a notch-shaped recess that can be engaged, and the lock claw. , Lock recesses of the same structure are formed at the separated positions of the lock plate,
The biasing force of the lock spring selectively locks the lock claws into each recess and controls the rotation of the lock plate that accompanies the lockrest, allowing the headrest to be retained at the initial support position and the emergency support position. I am trying.

Further, according to a fourth aspect of the present invention, the lock releasing means is a push button which is exposed at the upper end of the seat back under the support of a hinge bracket so that the lock releasing means can be operated from the outside of the seat back. An interlocking pin that is rotatably attached to the outer side of the hinge bracket where the lock claws are arranged and that penetrates through a long guide hole formed in the hinge bracket enables interlocking with the lock claws. It is formed to include a support plate connected to the support plate and a connection rod connecting the support plate and the push button so as to interlock with each other.

Further, according to the fifth aspect of the present invention, the hinge shaft integrally supports the stay holder into which the stay can be inserted, and the stay holder has a structure in which the stay can be attached and removed. The headrest can be attached to and detached from the back.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, in the vehicle seat structure 10 according to the present invention, the headrest 12 is formed on the upper part of the seatback 14 via the stay 16. And in this invention,
The headrest 12 is supported by a rotation fulcrum 18 arranged inside the seat back 14 so as to be rotatable in the front-rear direction.

The headrest 12 has, for example, a frame body (not shown) arranged around the upper end portion of the stay 16 as a skeleton, and an elastic body (pad body) 20 is arranged around this frame and the trim cover is used. The head of the seated person can be elastically supported by covering with a cover 22 such as. And this stay extended downwards
The headrest 12 can be attached to the upper portion of the seatback 14 by inserting the 16 into the stay holder 24, for example.

It should be noted that the basic structure of the headrest 12 is the same as a general structure in which the stay is extended downward, and the structure of the headrest itself is not the purpose of the present invention. The detailed description will be omitted.

Here, as can be seen from FIG. 3 in addition to FIG. 1, in this embodiment, the headrest 12
As the rotation fulcrum 18 arranged in the seat back, for example, a hinge shaft extending in the seat left-right direction is illustrated. The hinge shaft (rotational fulcrum) 18 is the upper end 26 of the seat back frame that forms the skeleton of the seat back 14.
A pair of left and right hinge brackets 28-L and 28-R fixed to the rotatably pivotally support.

As shown in FIG. 3, for example, on the hinge bracket 28-L side, the hinge shaft 18 has a washer.
The hinge bracket 28-L is connected and pivotally supported via a pin 34 with a 32, and on the hinge bracket 28-R side, the hinge bracket is connected via a pin 38 of a lock plate 36 described later and a washer 40. 28-R is connected and pivotally supported. Then, in this embodiment, in order to make the hinge shaft 18 the pivot of the headrest 12,
A stay holder 24 into which the stay 16 of the headrest is inserted is connected to this hinge shaft.

For example, a pair of left and right base brackets 42
Are fixed to left and right separated positions of the hinge shaft 18, and pipe-shaped guide brackets 44 are further fixed to the respective base brackets. Then, the stay holder 24 is fixedly connected to and held by the guide bracket 44 under its insertion, whereby the stay holder can be connected to the hinge shaft 18.

Here, it is preferable that the stay holder 24 has, for example, a lock means and a lock release means (neither is shown). By using the stay holder 24 having such a configuration, the height of the headrest 12 with respect to the seatback 14 can be adjusted and the headrest 12 can be attached and detached.

Incidentally, the structure itself of the stay holder having the locking means and the unlocking means is publicly known, and since the structure itself is not the gist of the present invention, detailed description thereof is omitted here. As described above, since the hinge shaft 18 is only rotatably supported between the left and right hinge brackets 28-L and 28-R, the headrest 12 connected and supported by the hinge shaft has the hinge shaft 18 connected to the hinge shaft. The seat back 14 is rotated about the shaft in the front-rear direction (see FIG. 1).

As shown in FIG. 2, for example, by providing a slit 45 of an appropriate length which communicates with the stay holder 24 at the upper end of the seat back 14, the inside of the seat back with the stay 16 and by extension the stay holder is provided. Easy to rotate the headrest 12 back and forth around the hinge shaft,
And it goes without saying that it can be guaranteed smoothly.

Here, the headrest 12 according to the present invention.
The rotation range of the normal support position shown in FIG. 1 located at the rear and the support position at the time of emergency, that is, at the time of occurrence of a rear impact, are defined in front of the normal support position. Between the emergency support positions of the. Further, in the present invention, the weight body 46 having a predetermined weight is provided at a position below the weight shaft 46 with the hinge shaft 18 sandwiched therebetween.
12 is rotatably connected to the headrest 12 by inertial movement of the weight body when a rear impact is generated, and the headrest is rotated forward from the normal support position of FIG. 1 to the emergency support position of FIG. ing.

At the time of occurrence of a so-called rear impact such as a collision at the time of retreating the vehicle or a rear-end collision with the rear of the vehicle,
An impact load F from the rear of the vehicle, which is indicated by an arrow in FIG. 1 (A), acts on the seat, that is, the seat back 14. Then, a force that resists the impact load F and tries to remain at its initial position is generated in the weight body 46, so that the force that opposes the acting direction of the impact load F becomes an inertial force, which causes the seat rearward (right in the figure). The movement of the weight body to the person) means the inertial movement of the weight body.

As shown in FIGS. 1A and 3, the weight body 46 is formed as, for example, a rod-shaped body extending in the left-right direction of the seat, and a part of the weight body 46 is fixed to the hinge shaft 18 to secure the hinge. It is integrally connected and fixed to the hinge shaft via a hanging shaft 48 hanging downward from the shaft.

Here, in the present invention, the engagement means 50 uses the inertial load resulting from the rear impact as a reference for the engagement force.
The engagement of the headrest 12 makes it possible to hold the headrest 12 in its normal support position and also forcibly hold this headrest in its emergency support position under the locking of the locking means 52 capable of automatic locking operation. I am trying.

As can be seen from FIGS. 1 and 3,
In this embodiment, for example, a substantially fan-shaped lock plate 36 whose arcuate circumferential surface serves as a guide surface 36a can rotate integrally with the hinge shaft 18, and, for example, via a detent boss 54, this hinge. It is fixed to one end of the shaft, and the lock claw 56 can be slidably contacted to the guide surface of the lock plate under the biasing force of the lock spring 58, and can be moved to the hinge bracket on the corresponding side, that is, the hinge bracket 28-R. It is installed in.

The lock claw 56 is, for example, a hinge pin.
By being pivotally attached by 60, it is rotatably arranged on the inner surface side of the hinge bracket 28-R. Then, the biasing force of the lock spring 58, which is erected and stretched between the locking pin 62 projecting from the lock claw 56 and the outer end piece of the hinge bracket 28-R, and which is, for example, a tension coil spring. Originally, this lock claw
It is offset in the sliding contact direction with respect to the lock plate guide surface.

As will be described later, the locking pin 62 of the lock claw has an elongated hole-shaped guide hole 64 formed in the hinge bracket 28-R through which the inner surface of the hinge bracket 28-R is exposed to the outer surface thereof. The lock spring 58 is disposed on the outer surface side of the hinge bracket 28-R as shown in FIG. 1B and FIG.

Under the combination with the lock claw 56, the engagement of the lock claw, the engagement concave part as a notch-like concave part which can be engaged, which can be the engaging means 50 under the combination with the lock claw 56, and the combination with the lock claw. Locking recesses of the same structure that can serve as the locking means 52 are formed at the separated positions of the lock plate 36, respectively.

The engagement force of the lock claw 56 with respect to the engagement recess (engagement means) 50 of the lock plate is set with the inertial load resulting from the rear impact as a reference of the engagement force as described above. The resultant force is, for example, the lock spring 58
It is adjusted by the biasing force possessed by, or the shape of the notch-shaped recess serving as the engaging recess. For example, the engagement recess is formed in a so-called ratchet gear shape that can ensure only forward rotation of the headrest 12 from this engaged state.

The locking recess (locking means) 52 is automatically locked, that is, the locking claw 56 to the locking recess.
The automatic engagement and engagement of are required. However, the lock claw 56 forcibly released from the engagement with the engagement recess 50 at the normal support position of the headrest 12 has its guide surface 36 rotated by the rotation of the lock plate 36 with the hinge shaft 18.
It is forcibly moved and slid into contact with a. Then, as the lock plate 36 further rotates, the lock claw 56 to the lock recess 52 is formed.
By this alignment, the lock claws are automatically meshed and engaged with each other under the biasing force of the lock spring 58. Therefore, according to this configuration, the automatic locking of the lock recess can be ensured.

For example, when a rear collision of the vehicle occurs at the normal support position of the headrest 12 shown in FIG. 1, the impact load F resulting from the rear impact is input to the seat, and further to the seat back 14. Then, due to the inertial load that opposes the impact load F, the weight body 46 moves to the hinge shaft.
It tries to rotate counterclockwise (rearward) in the figure with this hinge shaft about 18 as a center. When this inertial load exceeds the engaging force of the lock claw 56 with respect to the engaging recess 50, the weight body 46 with the hinge shaft 18 as the center of rotation is accompanied by the forced release of the engagement between the engaging recess and the lock claw. Due to the inertial movement, the headrest 12 is rotated forward from its normal support position in FIG. 1 toward the front (left side in the figure) emergency support position with the hinge shaft as the rotation fulcrum.

When the headrest 12 rotated forward by the inertial movement of the weight body 46 toward the rear reaches the emergency support position, as shown in FIG. 4, the headrest 12 is biased by the lock spring 58 as shown in FIG. By the automatic engagement and engagement of the lock claw 56 with the lock recess 52, the headrest is fixedly held in its emergency support position.

As described above, if the headrest 12 is moved to the emergency support position and further fixedly held at the emergency support position due to the occurrence of the rear impact, the headrest fills the gap behind the head. Therefore, the sudden and extreme rearward inclination of the head following the rearward movement of the upper body of the seated person at the time of a rear collision is reliably suppressed. Therefore, the whiplash movement caused by the sudden backward tilt of the head can be reliably suppressed, and the effect of protecting the head and neck at the time of a rear collision is sufficiently improved, and the damage to the seated person is further reduced.

By the way, when the headrest 12 is held at the emergency support position in front of the normal support position as described above, the support is effective and appropriate at the time of a rear-end collision or the like, but after that, this emergency The headrest in the support position prevents normal seating of the seat.

Therefore, in the present invention, the lock releasing means 66 is provided so as to be interlockable with the lock means, that is, the lock claw 56 which can be the lock means in combination with the lock recess 52. The engagement and engagement between the lock claws, that is, the lock can be arbitrarily released.

As shown in FIGS. 1 and 4, the lock releasing means 66 is formed, for example, on the outer surface side of the hinge bracket 28-R having the lock claw 56 arranged on the inner surface side thereof.

The unlocking means 66 is provided with a push button 68 which can be pressed. The push button 68 is arranged so as to be able to move up and down on the garnish 70 fixed to the upper end of the hinge bracket 28-R, and is exposed and arranged on the upper end of the seat back 14 so that it can be operated from outside the seat back ( See FIG. 2).

Further, the unlocking means 66 is provided with a support plate 74 axially attached to the outer surface side of the hinge bracket 28-R by a hinge pin 72. The support plate 74 is linked to the lock claw 56 provided on the inner surface side of the hinge bracket 28-R via the locking pin 62 of the lock claw so as to be interlocked. Then, by connecting the support plate 74 and the push button 68 so as to be interlockable with each other via the connecting rod 76, the rotation of the lock claw 56 against the biasing force of the lock spring 58 by the push operation of the push button can be performed. The unlocking means 66 is possibly constructed.

The lock spring 58 of the lock claw can also be used as a return spring for biasing and holding the push button 68 at the upper initial position.

When the push button 68 is pressed at the emergency support position of the headrest 12 held by the engagement and engagement of the lock claw 56 with the lock recess 52, as shown in FIG. The lock between the lock concave portion and the lock claw is released by the forced separation of. That is, since there is no restriction on the rotation of the hinge shaft 18, the headrest 12 can be rotated rearward in the direction of the normal support position, and the headrest can easily be withdrawn from the emergency support position. Then, when the headrest 12 is moved to the normal supporting position, the headrest is returned to the initial normal supporting position by the engagement between the engaging recess 50 and the lock claw 56 due to the biasing force of the lock spring 58.

As described above, in the vehicle seat structure 10 of the present invention, the headrest 12 can be rotated from the normal support position to the emergency support position under the occurrence of a rear impact, and the emergency support position is also provided. In addition, the headrest can be fixedly held. In this way, if the headrest 12 is fixedly held at the emergency support position, the headrest closes the gap behind the head, so that the head is suddenly and radically tilted backward after the backward movement of the upper body of the seated person. Is surely deterred.

Therefore, the whiplash motion caused by the sudden rearward tilt of the head can be surely suppressed, and the effect of protecting the head and the neck in the case of a rear collision is sufficiently improved, and the damage to the seated person is further reduced. .

Further, in the present invention, the headrest
Since the rotation fulcrums 12 are arranged inside the seat back 14, the rotation radius of the headrest can be sufficiently long.
That is, even if the headrest 12 is moved to the emergency support position under the forward rotation, the cushion surface 12 of the headrest 12
Since a large forward lean of a can be surely suppressed, emergency support with sufficient cushioning can be easily secured by this.

Therefore, the cushioning property of the headrest 12 at the emergency support position can be secured sufficiently high, and the safety thereof can be further improved.

Since the cushion surface 12a of the headrest at the normal support position can be the head contact position at the emergency support position, the rear impact is generated without changing the shape of the headrest to a corresponding shape. The head can be properly supported at the time.

Therefore, it is possible to surely enhance the effect of protecting the head without deteriorating the appearance quality of the headrest 12, and thus of the seat itself.

In the present invention, the weight body 46
Is disposed inside the seat back 14. That is,
Since the weight and size of the headrest 12 can be reliably prevented, the safety of the headrest can be further enhanced. Further, since it is possible to prevent the weight of the headrest 12 from being increased, it is unnecessary to strengthen the rigidity of the stay 16 and the holding force of the stay with respect to the seat back 14, and thus it is possible to certainly simplify the overall configuration thereof. Be done.

Further, in the present invention, the headrest
Since the headrest is moved from the normal support position to the emergency support position by rotating the headrest 12 back and forth, the headrest can be quickly and easily moved from the normal support position to the emergency support position. Further, since the headrest 12 is rotated back and forth by the rotation center arranged inside the seat back 14, there is no need to dispose a mechanism or the like for the rotation inside the headrest.

In other words, since a structure capable of moving to and holding the emergency support position can be obtained without any action on the headrest 12, the cushion surface 12a resulting from an increase in the size of the headrest or the presence of a mechanism or the like. It is possible to reliably eliminate the adverse effect on the headrest, such as narrowing of the width of the.
Therefore, also from this point, it is possible to further enhance the safety.

Further, in the present invention, since the lock releasing means 66 is provided, it becomes easy to arbitrarily return the headrest to the normal supporting position by the lock releasing operation at the emergency supporting position of the headrest 12. Therefore, the sitting posture after the occurrence of the rear impact is the headrest
Since it can be easily secured without being hindered by 12, the use performance is surely improved.

Here, in the embodiment of the present invention, the locking claw 56 and the engaging recess provided in the lock plate 38 are provided.
The combination of 50 and locking recess 52 is embodied as an engagement means and a locking means, respectively, which retains the headrest 12 in a normally supported position and the locking means is adapted for its automatic locking. Since it is sufficient if the headrest can be fixedly held at the emergency support position under this condition, the present invention is not limited to this, and the engaging means and the locking means may be formed as other configurations.

However, according to such a structure, the engaging means and the locking means can be commonly used and shared,
As a result, the number of parts can be reduced, so that the structure can be surely simplified.

Further, the engaging means is not limited to the combination of the engaging concave portion 50 and the lock claw 56, since it is sufficient to hold the headrest 12 at the normal supporting position, and for example, the engaging means may be biased by a spring member or the like. Thus, the headrest may be held at its normal supporting position.

In this case, the headrest
The biasing force of the spring member that biases and holds 12 to the normal supporting position is set with reference to the inertial load caused by the rear impact.

In the embodiment of the present invention,
Although the hinge shaft 18 is embodied as a fulcrum of rotation of the headrest 12, it is sufficient if the headrest is rotatably supported and is arranged inside the seat back 14, and therefore the hinge shaft is not limited to the hinge shaft, and for example, a hinge pin. Alternatively, the headrest may be connected to and supported by the seat back by using the above as a pivot.

Further, in the embodiment of the present invention,
Although the lock release means 66 is embodied as a combination of the push button 68, the support plate 74, and the connecting rod 76, the lock recess 52 and the lock claw 56 that serve as the lock means.
Since it suffices to be able to release the engagement between the lock release means and the lock release means, the lock release means may be formed from other configurations and the like.

However, if the lock release means 66 is formed as the configuration shown in this embodiment, it is possible to release the lock appropriately for the lock means without complicating the overall configuration.

In this embodiment, the stay 16 of the headrest can be attached to and detached from the stay holder 24. However, if the headrest 12 is connected to the hinge shaft 18 in the seat back, that is, the rotation fulcrum. However, the present invention is not limited to this, and for example, the hinge shaft, that is, the stay may be directly fixed to the hinge shaft or the like so that the stay cannot be detached from the seat back 14.

In this way, the stay 16 is attached to the hinge shaft 18
By fixing the weight body 46 to the extended end of the stay, the extended end of the stay extending downward from the hinge shaft can be used as a hanging shaft integral with the hinge shaft. The number of parts can be sufficiently reduced by fixing to the.

However, as in this embodiment,
If the stay 16 of the headrest is configured to be detachably inserted into the stay holder 24, the height of the headrest 12 can be adjusted, and the advantage of the detachable headrest, for example, replacement of the seat cover. It becomes possible to easily secure the above.

Therefore, even a seat provided with a headrest that can be moved to the emergency support position can be handled in the same manner as an ordinary seat, and therefore the versatility can be improved according to the present invention. You can expect enough.

The above-described embodiments are for explaining the present invention, and are not intended to limit the present invention in any way, and all modifications and alterations made within the technical scope of the present invention are also included in this embodiment. Needless to say, it is included in the invention.

[0073]

As described above, according to the vehicular seat structure of the present invention, the forward rotation of the headrest to the emergency support position fills the gap behind the head, so that the head is suddenly moved backward. The whipping motion caused by the tilt is reliably suppressed. Therefore, the damage to the seated person is further reduced by sufficiently improving the effect of protecting the head and neck in the event of a rear collision.

Since the rotation fulcrum of the headrest is arranged in the seat back, the rotation radius of the headrest can be sufficiently long. That is, even if the headrest is moved to the emergency support position under the forward rotation, a large forward tilt of the cushion surface of the headrest can be reliably suppressed,
Since the emergency support under the sufficient cushioning property can be secured thereby, the cushioning property at the headrest at the emergency support position can be secured sufficiently high, and the safety thereof is further improved.

Further, since the cushion surface of the headrest in the normal supporting position can be the head contacting position in the emergency supporting position, the rearrest impact can be generated without changing the shape of the headrest accordingly. The head support at is properly possible.

Therefore, it is possible to surely enhance the effect of protecting the head without deteriorating the appearance quality of the headrest and eventually the seat itself.

Further, since the weight body is arranged inside the seat back, the weight and size of the headrest can be reliably prevented. In other words, the safety of the headrest can be further increased, and it is not necessary to strengthen the stay or strengthen the staying force of the stay with respect to the seat back. Get rid of.

Further, according to the present invention, since the headrest is moved back and forth from the normal support position to the emergency support position by rotating the headrest forward and backward, the headrest can be quickly moved from the normal support position to the emergency support position.
It will be easy. Further, since the headrest is rotated back and forth by the center of rotation arranged inside the seat back, there is no need to dispose a mechanism or the like for the rotation inside the headrest.

In other words, since the structure capable of moving to and holding the emergency support position can be obtained without any action on the headrest, the width of the cushion surface due to the increase in size of the headrest or the presence of the mechanism portion or the like. The adverse effect on the headrest such as narrowing can be reliably eliminated. Therefore, also from this point, it is possible to further enhance the safety.

Since the unlocking means is provided,
By the lock release operation at the emergency support position of the headrest, it becomes easy to arbitrarily return the headrest to the normal support position. Therefore, the seating posture after the occurrence of the rear impact can be easily ensured without being hindered by the headrest, and the use performance thereof is surely improved.

If the combination of the lock claw, the engaging recess provided in the lock plate, and the locking recess is used as the engaging means and the locking means, respectively, the engaging means and the locking means can be commonly used. Is possible,
As a result, the number of parts can be reduced, so that the structure can be surely simplified.

The unlocking means is a push button,
With the combination of the support plate and the connecting rod, it is possible to appropriately release the lock with respect to the locking means without complicating the overall configuration.

Further, if the stay of the headrest can be attached to and detached from the stay holder, the height of the headrest can be adjusted and, in addition, the advantage of the detachable headrest, for example, replacement of the seat cover becomes possible. Etc. can be easily secured. Therefore, even a seat provided with a headrest that can be moved to the emergency support position can be handled in the same manner as a normal seat, and therefore, the versatility of the seat is expected to be sufficiently improved according to the present invention. it can.

[Brief description of drawings]

FIG. 1 is a schematic side view inside a hinge bracket and a schematic side view outside thereof showing a vehicle seat structure of the present invention in a normal support position of a headrest.

FIG. 2 is a schematic perspective view of a vehicle seat having a headrest.

FIG. 3 is a schematic partial exploded perspective view of a vehicle seat structure.

FIG. 4 is a schematic side view inside a hinge bracket and a schematic side view outside the same showing a vehicle seat structure in an emergency support position of a headrest.

5A and 5B are a schematic side view inside a hinge bracket and a schematic side view outside the same showing a vehicle seat structure at the time of an unlocking operation of an emergency support position of a headrest.

[Explanation of symbols]

10 Vehicle seat structure 12 headrest 14 seat back 18 Hinge shaft (rotation fulcrum) 36 lock plate 46 Weight body 50 Engaging means (engaging recess) 52 Locking means (lock recess) 56 lock claw 58 Lock spring 66 Unlocking means 68 push button 74 Support plate 76 connecting rod

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3B084 DA06 DB05 DB14 DC01 DD01                       JA01                 3B087 CD04 DC06 DC08

Claims (5)

[Claims] 1. A vehicle seat having a headrest in an upper portion of a seat back, wherein the headrest has a normal support position located rearward; and an emergency support position defined in front of the normal support position in an emergency. It is assembled to the seat back via a pivoting fulcrum arranged in the seat back so that it can be turned back and forth between the support position and; and the inertia load due to the rear impact is used as a reference for the engaging force. The headrest is held at its normal support position by the engagement of the coupling means, and the weight body having a predetermined weight is arranged and coupled integrally with the headrest at the lower position with the rotation fulcrum sandwiched therebetween. When an inertial load exceeding the engaging force of the engaging means is generated in the weight body under the rear impact impact, the headrest is moved under the inertial movement of the weight body accompanied by the forced release of the engaging means. When the headrest reaches the emergency support position by rotating it forward in the direction of the emergency support position in front of the normal support position, this headrest is forced to the emergency support position under the lock of the locking means that can be automatically locked. The lock release means is provided so that it can be interlocked with the lock means and can be operated from outside the seat back, and the lock release operation for the lock means by the lock release means at the emergency support position of the headrest is performed. The vehicle seat structure allows the headrest to be arbitrarily returned from the emergency support position to the normal support position. 2. A vehicle seat having a headrest in an upper portion of a seat back, wherein a hinge shaft extending in a lateral direction of the seat is rotated to a top end of a seat back frame forming a skeleton of the seat back via a pair of left and right hinge brackets. By connecting the stay to the hinge shaft that is movably connected and supported and serves as a pivot, the headrest has a normal support position located rearward; and an emergency support defined in front of the normal support position. The headrest is attached to the seat back so as to be rotatable back and forth between the emergency support position, which is a position, and the engagement means engages with the inertial load resulting from the rear impact as a reference of the engaging force. The weight body, which is held in its normal support position and has a predetermined weight, can rotate integrally with the headrest below the hinge shaft. When the inertia load exceeding the engaging force of the engaging means is generated in the weight body under the rear impact, it is forcibly released from the engaging means. Under this inertial movement of the weight body, the headrest is rotated forward in the direction of the emergency support position in front of the normal support position, and when the headrest reaches the emergency support position, locking means capable of automatic locking operation is possible. This headrest is forcibly held in the emergency support position under the lock of the headrest, and the unlocking means is provided so that it can be interlocked with this locking means and can be operated from outside the seat back. At this position, the lock release operation for the lock means by the lock release means makes it possible to arbitrarily return the headrest from the emergency support position to the normal support position. Seat structure for a vehicle. 3. A substantially fan-shaped lock plate having its arcuate circumferential surface as a guide surface is fixedly arranged at one end of the hinge shaft so as to be integrally rotatable with the hinge shaft, and the lock pawl is provided with a lock spring. Is slidably contacted with the guide surface of the lock plate under the biasing force of the above, and is movably disposed on the hinge bracket, and can be an engaging means in combination with the lock claw.
Formed at the separated positions of the lock plate are lock recesses of the same structure that can serve as locking means in combination with the engagement of the lock pawls, engagement recesses serving as engageable notch recesses, and lock pawls. However, due to the biasing force of the lock spring, the locking claws are selectively engaged with the recesses, and the rotation of the lock plate is restricted due to the engagement, so that the headrest is positioned at the initial support position and the emergency support position. The vehicle seat structure according to claim 2, which can be held. 4. A push button, wherein the unlocking means is operable at the outside of the seat back and is exposed at the upper end of the seat back under the support of a hinge bracket.
An interlocking pin that is rotatably attached to the outer side of the hinge bracket where the lock claws are arranged and that penetrates through a long guide hole formed in the hinge bracket enables interlocking with the lock claws. The vehicle seat structure according to claim 3, further comprising: a support plate connected to the support plate; and a connection rod connecting the support plate and the push button so as to be interlocked with each other. 5. A headrest can be attached to and detached from a seat back by integrally supporting a stay holder into which a stay can be inserted and attached to the hinge shaft, and by making this stay holder detachable. Item 5. The vehicle seat structure according to any one of items 2 to 4.