JP2015020703A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a structure capable of shortening a time for a headrest to contact the head of an occupant in a collision, with a simpler structure.SOLUTION: A vehicle seat 1 is such that: a headrest 2 is held so as to be swingable in a front/back direction when a vehicle receives a prescribed load; a lower end position of a back part of a headrest holder 6 is positioned above a lower end position of a front part of the headrest holder 6; and an amount of front-side displacement as an amount allowing a headrest body 22 to move from an initial position to a front side when the headrest 2 swings is set larger than an amount of rear-side displacement as an amount allowing the headrest body 22 to move from the initial position to a rear side.

Description

  The present invention relates to a vehicle seat. In detail, it is related with the vehicle seat provided with the headrest.

Conventionally, a vehicle seat including a headrest is known. Even when seated on a vehicle seat equipped with a headrest, the headrest and the head of the occupant are often separated from each other at normal times. For this reason, when a so-called rear collision or the like occurs, the head of the occupant may fall backward, causing the neck to warp rearward, and a symptom called whiplash may occur. On the other hand, it is also known that it is possible to suppress the occurrence of whiplash by holding the head with a headrest before the neck is excessively bent back. Therefore, in order to suppress the occurrence of whiplash, a vehicle seat having a function of moving the headrest forward than in the normal time at the time of a collision has been proposed (see Patent Document 1).
In the technique described in Patent Document 1, a headrest support, which is a member into which a headrest stay provided in a headrest is inserted, is inserted into a headrest holder together with a member that can be elastically deformed. By adopting this configuration, the headrest stay is fixed so that it normally extends substantially vertically upward, and at the time of a rear collision, the headrest is pushed to the head of the occupant by pressing a member provided in the seat back backward. It is configured to be able to be tilted to the side.

JP 2004-17826 A

Although the technology described in Patent Document 1 contributes to reducing the number of parts compared to the state of the art at that time, the headrest is tilted using the load applied to the seat back from the occupant's back. Therefore, even though the configuration is still complicated, further simplification has been demanded. It has also been desired that the occupant's head and the headrest come into contact with each other prior to firmly holding the occupant's head.
By the way, it is possible to make the headrest swingable in the front-rear direction when a load of a predetermined value or more is generated due to a rear collision or the like.
Therefore, the present inventor may reduce the time until the head of the occupant contacts the headrest at the time of a rear collision by making the aspect of the headrest swinging in the front-rear direction unique. Thought.

  The present invention was devised in view of the above points, and the problem to be solved by the present invention is a configuration that can shorten the time until the headrest contacts the occupant's head during a collision. It is to achieve with a simple configuration.

In order to solve the above problems, the present invention takes the following means.
First, a first invention includes a headrest including a headrest body and a headrest stay, a headrest support capable of inserting the headrest stay from above, and a seat back including a headrest holder capable of supporting the headrest support in a back frame. In the vehicle seat, the headrest is held so as to be swingable in the front-rear direction when the vehicle receives a predetermined load, and a lower end position of a rear portion of the headrest holder is a front portion of the headrest holder. The amount of front side displacement, which is located above the lower end position and can move so that the headrest body is located in front of the initial position when the headrest swings, is greater than the initial position of the headrest body. Is larger than the rear displacement, which is the amount that can move rearward. Characterized in that it is.

  According to the first invention, a headrest including a headrest body and a headrest stay, a headrest support capable of inserting the headrest stay from above, and a seat back including a headrest holder capable of supporting the headrest support in a back frame, With respect to the vehicle seat, the headrest is held so as to be swingable in the front-rear direction when the vehicle receives a predetermined load, and a lower end position of a rear portion of the headrest holder is a front portion of the headrest holder. The front displacement amount is an amount that allows the headrest body to move so that the headrest body is positioned forward of the initial position when the headrest swings. Larger than the rear displacement, which is the amount that can move to the rear Because it is constant, in the case that receives a load from the rear of the vehicle seat also headrest becomes possible to increase the likelihood of contact with the early occupant's head.

  According to a second aspect, in the first aspect, the vertical length of the front surface of the headrest holder is longer than the vertical length of the rear surface.

  According to the second invention, the vertical length of the front surface of the headrest holder in the first invention is longer than the vertical length of the rear surface. Even when working, the headrest is difficult to tilt, and it may be possible to hold the occupant's head firmly.

  A third invention is characterized in that, in the first invention or the second invention, when the vehicle receives a predetermined load, the upper part of the headrest support can be tilted so as to be displaced forward. And

  According to the third invention, the headrest support of the first or second invention is tiltable so that the upper part of the headrest support is displaced forward when the vehicle receives a predetermined load. Therefore, when a force exceeding the load is applied, the headrest body is more easily displaced forward. Therefore, it is possible to further increase the possibility that the headrest will contact the occupant's head at an early stage.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to achieve the structure which can shorten time until a headrest contacts a passenger | crew's head at the time of a collision with a simpler structure.

It is a perspective view of the vehicle seat of the present invention. It is a figure which shows the headrest holder of this invention, a headrest support, and a headrest. It is the figure which showed the state (solid line) of the headrest stay of an initial state, and the state (two-dot difference line) of the headrest stay inclined toward the passenger | crew from the initial state. It is a figure which shows the positional relationship of a headrest and a passenger | crew's head. It is the schematic showing the time-dependent change of the position of a passenger | crew's back head and a headrest main body.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings as appropriate. In this specification, the front-rear direction, the up-down direction, the left-right direction, and the like are defined such that X shown in FIG. 1 is the front direction, Y is the left direction, and Z is the up direction. For example, normally, when the occupant P is seated, the field of view is the front, and the occipital region PbH side that does not enter the field of view is the rear.
The vehicle seat 1 according to the present embodiment includes a headrest 2 that mainly contacts the back head PbH of the occupant P, a seat back 3 that mainly contacts the back of the occupant P, and a large size of the occupant P. A seat cushion 4 that comes into contact with the thigh is provided. The seat back 3 and the seat cushion 4 are connected by a reclining mechanism (not shown), and the tilt angle of the seat back 3 is configured to be variable. Further, the vehicle in the present embodiment is a vehicle.

The headrest 2 is obtained by integrating a substantially U-shaped headrest stay 21 with a headrest body 22 having cushioning properties. The headrest body 22 is configured to cover a headrest pad (not shown) with a headrest cover (not shown).
The headrest stay 21 is detachably mounted on and supported by a headrest support portion provided on the seat back 3. The headrest support portion includes a headrest holder 6 and a headrest support 5. More specifically, the headrest support portion is formed by fitting and engaging the locking claws 55 provided in the headrest support 5 with the locking holes 61 provided in the headrest holder 6. In addition, the seat back 3 is provided with a back frame 7 as a skeleton, and two cylindrical headrest holders 6 extend in the vertical direction on the front side of the upper frame 71 located on the upper portion of the back frame 7. They are arranged in parallel. Headrest supports 5 and 5 are inserted and fixed in each of the two headrest holders 6 and 6. The end portions of the headrest stay 21 can be inserted into the support holes 58 and 58 provided in the two headrest supports 5 and 5. One of the headrest supports 5 has a structure capable of selecting and fixing the vertical position of the headrest 2.
Further, a back pad (not shown) is mainly disposed on the seat back 3 with respect to the occupant P side of the back frame 7, and a seat cover (not shown) is attached so as to press the back pad against the back frame 7.

  In the vehicle seat 1 of the present embodiment, the headrest 2 includes a metal headrest stay 21. The seat back 3 has a resin-made headrest support 5 that can be deformed at least partially when a load of a predetermined value or more is applied, and a metal and cylindrical shape that holds the headrest support 5. Two headrest holders 6 are provided. The headrest holder 6 is fixed so that the central axis C thereof is positioned substantially parallel to the upper frame 71 of the metal back frame 7. With such a configuration, the headrest support 5 is fixed by the headrest holder 6 fixed to the upper frame 71, and the headrest stay 21 is further fixed by the headrest support 5.

Moreover, as shown in FIG. 2, the headrest support 5 and the headrest holder 6 have different lengths in the vertical direction between the front side portion and the rear side portion. The front side portion of the headrest holder 6 is longer than the rear side portion, and the front side portion of the headrest support 5 is also formed longer than the rear side portion.
Further, the headrest support 5 is made of resin, and the headrest support 5 bends when a large load that causes relative movement between the headrest stay 21 and the headrest support 5 is applied. Thus, the headrest stay 21 can be inclined with respect to the headrest support 5. It should be noted that the position of the headrest body 22 in a state where a load that causes relative movement between the headrest stay 21 and the headrest support 5 is not applied is the initial position, and when the load is applied, this initial position is set. It can be displaced forward or rearward from the position.
The amount that the headrest body 22 can be displaced forward from the initial position is referred to as a front displacement amount, and the amount that can be displaced rearward from the initial position is referred to as a rear displacement amount.

The headrest holder 6 that is a component of the headrest support portion will be further described.
The headrest support portion of the present embodiment is configured to include a metal headrest holder 6 provided in the upper frame 71 and a resin headrest support 5 inserted into the headrest holder 6. Among these, the headrest holder 6 is fixed to the back frame 7 by welding.
The headrest holder 6 has a substantially rectangular tube shape. Specifically, the front side wall part 62 that is the front side wall and the rear side wall part 63 that is the rear side wall are positioned in a substantially parallel state, and the right side wall part 64 that is the right side wall and the left side wall part. The left side wall 65 is also located in a substantially parallel state. When comparing the lower end position of the front side wall part 62 and the lower end position of the rear side wall part 63, the lower end position of the rear side wall part 63 is positioned above the headrest holder 6. More specifically, the lower end of the right side wall portion 64 and the lower end of the left side wall portion 65 are formed so that the position of the lower end is changed step by step so as to connect the lower end of the front side wall portion 62 and the lower end of the left side wall portion 65. Yes. In the present embodiment, the headrest support 5 is also positioned such that the lower end position of the rear side portion is higher than the lower end position of the front side portion. Thereby, as shown in FIG. 3, the headrest 2 is configured to be inclined forward easily compared to the headrest holder 6 inclined backward. Therefore, the front displacement amount can be set larger than the rear displacement amount.
Further, since the upper side of the headrest holder 6 is formed to be substantially perpendicular to the central axis C of the headrest holder 6, the upper end of the front side wall portion 62 and the upper end of the rear side wall portion 63 of the headrest holder 6 are high. The position is approximately the same.
The lower end of the rear side wall 63 of the headrest holder 6 substantially coincides with the lower end of the upper frame 71 extending substantially horizontally as a height position.

The configuration of the headrest support 5 will be further described.
The headrest support 5 includes a support head 51 to be disposed with its upper surface exposed on the outer surface of the seat back 3, and a substantially cylindrical support body 52 extending downward from the support head 51.
The headrest support 5 is disposed to face the lower end of the support head 51 so that the lower end of the support head 51 is substantially in contact with the upper end of the headrest holder 6. That is, the support head 51 is not inserted into the headrest holder 6 but the support body 52 is inserted.
The headrest support 5 is configured using a resin. In particular, it is made of polypropylene and has a rigidity that does not substantially deform during normal operation. Further, when a predetermined load generated by the vehicle being bumped rearward is applied, the vehicle can be deformed to such an extent that it can be bent. Therefore, when a predetermined load is applied, the headrest support 5 is deformed while being sandwiched between the metallic headrest holder 6 and the metallic headrest stay 21.

Even with the above configuration alone, the headrest 2 swings back and forth when a predetermined load is applied. In the present embodiment, in order to make the headrest body 22 closer to the occupant P rear head PbH side, The upper side of the headrest support 5 is configured to be able to tilt toward the front side, that is, the occupant P side.
In order to make it possible to tilt the upper portion of the headrest support 5 so as to be displaced to the front side, an elastic deformation portion 92 that can be elastically deformed is provided on the upper front portion of the headrest support 5. Specifically, as shown in FIGS. 2 and 3, a part of the headrest support 5 has an arcuate configuration that can be elastically deformed to form an elastically deformable portion 92. In the normal state, the elastic deformation portion 92 is not substantially deformed, and the headrest support 5 and the headrest holder 6 are in contact with each other and play one end of the role of maintaining the relative position. When applied, the headrest support 5 and the headrest holder 6 are configured to be relatively movable by elastic deformation.

Even if the elastic deformation portion 92 is provided, the headrest support 5 does not tilt with the degree of vibration generated in the vehicle at normal times. On the other hand, the headrest support 5 can be tilted when a predetermined load exceeding the normal use state is applied.
For example, it is possible to adopt a configuration in which nothing is provided in the portion provided with the elastically deformable portion 92 shown in FIGS. In this case, a gap is generated between the upper front portion of the support body 52 and the headrest holder 6. Even with such a configuration, the headrest 2 can be largely swung to the occupant P side. However, with this configuration, there is a risk that the headrest 2 will rattle at all times, and abnormal noise may occur due to the rattling.
On the other hand, by providing the elastic deformation portion 92, it is possible to suppress the headrest 2 from rattling or generating abnormal noise from the normal time, and when an excessive load is applied, The headrest 2 can be swung.

Moreover, the lower end of the rear side of the headrest support 5 is located above the lower end of the front side. Thereby, even when the headrest 2 is tilted so that the lower end side of the headrest stay 21 moves backward, the headrest support 5 can be prevented from obstructing the tilt.
In addition, an inclined portion 54 is provided at the rear lower end of the headrest support 5 from the central axis side of the headrest support 5 toward the outer peripheral side (see FIG. 2). When the headrest 2 is tilted so that the lower end side of the headrest stay 21 moves backward, the headrest support 5 can be prevented from being an obstacle to the tilt. .

When the headrest stay 21 is attached and fixed to the headrest holder 6, the lower end of the headrest stay 21 is located below the lower end on the rear side of the headrest holder 6. Further, the lower end of the headrest stay 21 is positioned below the lower end on the rear side of the headrest support 5.
Further, when the headrest stay 21 is attached and fixed to the headrest holder 6, the lower end of the headrest stay 21 is located above the lower end on the front side of the headrest holder 6. The lower end of the headrest stay 21 is located above the lower end on the rear side of the headrest support 5.
With such a configuration, the headrest stay 21 can be easily inclined to the front side, and can hardly be inclined to the rear side. In addition, it is possible to prevent the headrest 2 from moving easily during normal times, and it is possible to suppress the occurrence of rattling and abnormal noise.

A description will be given by comparing the normal headrest holder 6 and the headrest holder 6 of the present embodiment in which the lower end position on the rear side is the same as the lower end position on the front side. In the case of a normal headrest holder 6, the vertical lengths of the front side wall part 62 and the rear side wall part 63 are configured to be equal. Further, the front and rear lengths of the headrest support 5 are also configured to be equal.
In the case of the present embodiment, the black triangular portion shown in FIG. 3 is a portion to which force is mainly applied when the headrest body 22 moves rearward. Of these, the support portion located on the upper side of the rear side is referred to as a rear upper end support portion 83, and the support portion located on the lower side of the front side is referred to as a front lower end support portion 82. Further, the white triangular portion is a portion to which force is mainly applied when the headrest body 22 moves forward. Of these, the support portion located on the lower side of the rear side is referred to as a rear lower end support portion 84, and the support portion located on the upper side of the front side is referred to as a front upper end support portion 81.
An angle formed by a straight line connecting the rear upper end support portion 83 and the front lower end support portion 82 and the central axis C of the headrest holder 6 is A. The angle formed by the straight line connecting the front upper end support portion 81 and the rear lower end support portion 84 and the central axis C of the headrest holder 6 is B.
On the other hand, in the case of a normal headrest holder 6, the headrest holder 6 and the headrest support 5 are provided symmetrically in the front-rear direction, and when the headrest body 22 is moved forward, the portion to which force is mainly applied is connected by a straight line. An angle A ′ formed by the straight line and the central axis C of the headrest holder 6 is equal to the angle A.
That is, when the rear lower end of the headrest holder 6 is positioned above the front lower end as in the present embodiment, the straight line connecting the front upper end support portion 81 and the rear lower end support portion 84 and the headrest. It is understood that the angle B formed by the center axis C of the holder 6 can be larger than A ′ (= A).
Actually, since the thickness of the headrest stay 21 and the amount of deflection of the headrest support 5 are also related, a difference corresponding to the angle does not occur as the inclination of the headrest stay 21, but if considered simply, there is a difference in the angle. Therefore, it can be said that the headrest main body 22 can be tilted so that it can move largely to the front side rather than to the rear side.

Next, from the time of a rear impact when using the vehicle seat 1 having the holding structure of the headrest stay 21 of the present embodiment and the vehicle seat 1 having the holding structure of the headrest stay 21 of the normal form. The behavior until the headrest 2 and the occipital region PbH come into contact will be described using a conceptual diagram.
As shown in FIG. 4, the back head PbH of the normal passenger P is in a state of being separated from the headrest 2. At this time, the distance between the occipital region PbH and the headrest 2 is H. In FIG. 4, a normal position of a portion of the headrest main body 22 that comes into contact with the occipital region PbH of the occupant P is shown as a reference position (point 0).
FIG. 5 shows temporal changes in the position of the occipital region PbH and the position of the headrest 2 from when the rear collision occurs. The broken line shows the behavior of the occipital region PbH. The solid line shows the behavior of the headrest 2 in the vehicle seat 1 having the holding structure of the headrest stay 21 of the present invention, and the alternate long and short dash line of the headrest 2 in the vehicle seat 1 having the holding structure of the normal headrest stay 21. The behavior is shown.
When a rear collision occurs, the seat back 3 moves relatively toward the occupant P as indicated by the white arrow in FIG. When such an event occurs, as a result, as shown by the black arrow in FIG. 4, the occupant P applies a load backward to the seat back 3. Therefore, the seat back 3 falls slightly rearward due to the load from the passenger P. Thereby, the headrest 2 behaves like being displaced rearward. At this time, in the vehicle seat 1 having the holding structure for the headrest stay 21 according to the present embodiment, the headrest main body 22 swings back and forth while being largely displaced from the rear side to the front side. Therefore, as compared with the case where the holding structure for the normal headrest stay 21 is provided, it may be possible to shorten the time until the headrest 2 and the occupant P come in contact with the rear head PbH at the time of a rear collision. In the example shown in FIG. 5, it is shown that the vehicle seat 1 of the present invention is accelerated by ΔT as compared with the vehicle seat 1 having a normal headrest stay 21 holding structure.

In the case of the vehicle seat 1 of the present embodiment, the headrest 2 swings in the front-rear direction in the case of a rear collision. Moreover, it swings so as to be largely displaced forward compared to the rear. Therefore, it may be possible to shorten the time from the time of the rear collision until the rear head PbH of the occupant P contacts the headrest 2.
Further, in order to form the vehicle seat 1 of the present embodiment, the headrest holder 6 and the headrest support 5 only need to be different from the normal vehicle seat 1, and thus a simple configuration. Is possible. Moreover, since it is a simple form, it can become possible to shorten the time from the time of a rear collision until the back head PbH of the passenger | crew P and the headrest 2 contact | connect, suppressing the increase in the weight of the vehicle seat 1 whole.
Moreover, since only the headrest holder 6 and the headrest support 5 are changed, a large space is not required to satisfy the function. Therefore, the present invention can be applied to various forms of vehicle seats 1.
Further, since the vertical length of the front side wall 62 of the headrest holder 6 is longer than the vertical length of the rear side wall 63, the length of the front side wall 62 of the headrest holder 6 is ensured. Is possible. Therefore, it is possible to suppress the headrest support 5 and the headrest 2 from being easily swung back and forth during normal times. In addition, when the headrest support 5 and the headrest 2 are tilted rearward, the tilt angle is mainly regulated by the rear upper end support portion 83 located on the rear side and the front lower end support portion 82 located on the front side. When the front surface of the holder 6 becomes longer in the vertical direction, the angle can be reduced.
On the other hand, when the headrest 2 is tilted forward, the tilt angle is regulated mainly by the front upper end support portion 81 located on the front side and the rear lower end support portion 84 located on the rear side. By shortening the side surface in the vertical direction, the angle can be made relatively large.

Although one example has been described above, the present invention can be implemented in various other forms besides the above embodiment.
For example, the headrest stay need not be substantially U-shaped, and two headrest stays connected to each other by a plate-like member, such as a rod shape that extends substantially straight, or a shape that is bent into a square shape, etc. A configuration is also possible.
Further, the seat pad and the seat cover are not necessarily separated from each other, and the seat pad and the seat cover may be integrally formed.
In the present embodiment, the headrest support itself is used to press the headrest stay rearward at the upper position of the headrest support. However, a spring member such as a leaf spring is used separately from the headrest support. It is also possible to adopt a configuration in which the headrest stay is pressed to the rear side by disposing the headrest on the front side.
In addition, by providing a cut-and-raised portion that protrudes inward with respect to the headrest holder, an elastically deformed portion is formed, and the headrest stay is normally held so as not to be displaced, and a large load such as a rear-end collision is applied. In some cases, the headrest stay can be inclined forward by deforming the cut and raised portion.
In the present embodiment, the headrest can be tilted forward together with the headrest support. However, the headrest support may not be moved and the headrest stay may be easily tilted forward. For example, it is possible to form the said structure by providing the elastic deformation site | part which protrudes in the inner surface side (center axis side) of a headrest support.
It is also possible not to provide the elastic deformation site in the present embodiment. When the headrest swings, it only needs to be tilted more forward than the neutral position.For example, the front upper part of the headrest support is configured to be more fragile than the other parts, and the fragile part is deformed in the event of a collision. By doing so, you may comprise so that it may incline many to the front side.
Further, there is no need for a vehicle seat that can adjust the inclination of the seat back as in the present embodiment, and a vehicle seat in which the relative position between the seat back and the seat cushion cannot be changed is also possible.
Further, the rear side displacement amount of the headrest body is preferably as small as possible, and the rear side displacement amount may be zero. However, even if the rear displacement amount is somewhat large, the object can be achieved if the front displacement amount is larger than the rear displacement amount.
Further, the vehicle is not limited to a vehicle such as an automobile or a railroad, but may be a vehicle that flies in the air such as an airplane or a helicopter, or a vehicle that moves on the sea surface or in the sea such as a ship or a submersible.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Headrest 3 Seat back 4 Seat cushion 5 Headrest support 6 Headrest holder 7 Back frame 21 Headrest stay 22 Headrest main body 51 Support head 52 Support main body 71 Upper frame P Crew PbH Rear head

Claims (3)

A vehicle seat having a headrest including a headrest body and a headrest stay, a headrest support capable of inserting the headrest stay from above, and a seat back including a headrest holder capable of supporting the headrest support in a back frame,
The headrest is held so as to be swingable in the front-rear direction when the vehicle receives a predetermined load,
The lower end position of the rear part of the headrest holder is located above the lower end position of the front part of the headrest holder, and when the headrest swings, the headrest body may move so as to be located in front of the initial position. A vehicle seat characterized in that a front side displacement amount, which is a possible amount, is set to be larger than a rear side displacement amount, which is an amount by which the headrest body can move rearward from the initial position. The vehicle seat according to claim 1,
A vehicle seat characterized in that the length in the vertical direction of the front surface of the headrest holder is longer than the length in the vertical direction of the rear surface. The vehicle seat according to claim 1 or 2,
A vehicle seat, wherein the vehicle seat is tiltable so that an upper part of the headrest support is displaced forward when the vehicle receives a predetermined load.

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