JP6763790B2 - Headrest - Google Patents

Description

The present application relates to headrests applied to seats of vehicles such as automobiles, railroad vehicles, ships and aircraft.

For example, in the vehicle seat headrest described in Patent Document 1, a blow-molded shock absorber is included in the headrest.

Japanese Unexamined Patent Publication No. 2015-80976

The present application provides a headrest capable of further improving the shock absorbing effect.

In the present application, there are a headrest main body (11) capable of receiving a load in a direction from the front side of the seat to the rear side of the seat, and a movable plate portion (14) arranged on the front side of the seat of the headrest main body (11). The movable plate portion (14) which has a receiving surface (14A) for receiving a load and is displaceable with respect to the headrest main body (11) and is immovable with respect to the headrest main body (11) or the headrest main body (11). It is provided with a locked portion (14C) provided in a movable plate portion (14) and a locking portion (16A) that can be locked.

The locking portion (16A) has a strength to break when a load exceeding a predetermined size is applied through the movable plate portion (14). Further, in the movable plate portion (14), when the locking portion (16A) is broken, the upper end side of the movable plate portion (14) is on the rear side of the seat as compared with before the locking portion (16A) is broken. The tilt angle of the receiving surface (14A) has changed due to the movement to, and the headrest body (11) or the immovable portion (16) is supported.

As a result, in the present application, when a load exceeding a predetermined size is applied to the movable plate portion (14), the movable plate portion (14) is tilted to the rear side as compared with before the load is applied to the headrest. Since the inclination angle of the receiving surface (14A) changes, the impact energy can be appropriately absorbed and relaxed.

The present application may be configured as follows.
That is, when the locked portion (14C) is the first locked portion (14C) and the locked portion (16A) is the first locking portion (16A), the headrest main body (11) or the headrest main body ( At the portion (16) that is immovable with respect to 11), a second locked portion (14D) provided on the movable plate portion (14) and a protruding second locking portion (16B) that can be locked are provided. It is provided.

The second locking portion (16B) is when a load exceeding a predetermined size acts via the movable plate portion (14), and after the first locking portion (16A) is broken. It is configured to break.

As a result, it is possible to prevent the movable plate portion (14) from being further tilted toward the rear side of the seat after the first locking portion (16A) is broken.
Incidentally, the reference numerals in the parentheses are examples showing the correspondence with the specific configurations and the like described in the embodiments described later, and the present invention is limited to the specific configurations and the like shown in the symbols in the parentheses. It's not something.

It is an external view of the vehicle seat which concerns on embodiment of this invention. It is an external view of the headrest 10 which concerns on 1st Embodiment of this invention. It is sectional drawing of the headrest 10 which concerns on 1st Embodiment of this invention. It is a figure which shows the feature of the headrest 10 which concerns on 1st Embodiment of this invention. It is a figure which shows the action and effect of the headrest 10 which concerns on 1st Embodiment of this invention. It is a figure which shows the feature of the headrest 10 which concerns on 2nd Embodiment of this invention. It is a figure which shows the feature of the headrest 10 which concerns on 2nd Embodiment of this invention. It is a figure which shows the feature of the headrest 10 which concerns on 3rd Embodiment of this invention.

The "embodiment of the invention" described below is an example of an embodiment belonging to the technical scope of the present invention. That is, the matters specifying the invention described in the claims are not limited to the specific configuration, structure, etc. shown in the following embodiments.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The arrows and the like indicating the directions attached to each figure are described in order to make it easier to understand the relationship between each figure. The present invention is not limited to the directions attached to each figure.

It is desirable that at least one member or part described with a reference numeral is provided unless otherwise specified such as "one". That is, if there is no notice such as "one", two or more of the members may be provided.

(First Embodiment)
In this embodiment, the present invention is applied to a front seat of an ordinary passenger car. In addition, the direction in the following description means the direction in the state where the vehicle seat according to this embodiment is assembled to the vehicle.

1. 1. Outline of the vehicle seat As shown in FIG. 1, the vehicle seat 1 has at least a seat cushion 3 and a seat back 5. The seat cushion 3 is a portion for supporting the buttocks and the like of the seated person. The seat back 5 is a portion for supporting the back of the seated person. A headrest 10 is attached to the upper end side of the seat back 5. The headrest 10 is a portion for supporting the head of the seated person.

2. 2. Schematic structure of the headrest As shown in FIG. 2, the headrest 10 is configured to include at least a headrest main body 11, a front plate 12, a rear cover 13, and the like. The headrest main body 11 is a portion capable of receiving a load acting on the headrest 10.

That is, the headrest main body 11 is connected to the rod-shaped stay portions 11A and 11B extending toward the seat back 3. As shown in FIG. 1, the stay portions 11A and 11B are connected to the back frame 5A.

Therefore, the load acting on the headrest 10 is transmitted to the back frame 5A via the headrest main body 11 and the stay portions 11A and 11B. That is, the headrest main body 11 can receive a load acting on the headrest 10.

The stay portions 11A and 11B are made of metal pipe material. The back frame 5A is a metal frame that constitutes the skeleton of the seat back 5. Incidentally, the headrest main body 11 according to the present embodiment incorporates an electric mechanism for displacing the headrest 10.

The front plate 12 shown in FIG. 2 is a member constituting the front portion 10A (see FIG. 1) located on the seat front side of the headrest main body 11, that is, on the head side of the seated person. The rear surface side cover 13 is a member arranged on the seat rear side of the headrest main body 11 and covering the headrest main body 11 from the seat rear side.

The lower surface side of the headrest main body 11 is closed by the bottom plate portion 13A. An elastically deformable front pad 10B such as urethane is provided on the front side of the seat of the front plate 12. The outer surfaces of the front pad 12B and the rear cover 13 are covered with a skin 10C such as natural leather or synthetic leather.

2.1 Structure of front side plate As shown in FIG. 3, the front side plate 12 is configured to include a movable plate portion 14, a frame portion 15, and the like. That is, the front portion 10A of the headrest 10 facing the front side of the seat is composed of the movable plate portion 14, the frame portion 15, and the like.

The movable plate portion 14 has a receiving surface 14A for receiving the load F, and can be displaced at least to the rear side of the seat with respect to the headrest main body 11. The load F is a load in the direction from the front side of the seat toward the rear side of the seat, that is, a load in the direction in which the movable plate portion 14 is displaced toward the rear side of the seat.

The frame portion 15 is a member that surrounds the outer circumference of the movable plate portion 14 and is immovable with respect to the headrest main body 11. The frame portion 15 according to the present embodiment has a first frame portion 15A and a second frame portion 15B that surround at least the seat width direction among the movable plate portions 14.

Then, in the present embodiment, the upper end side of the first frame portion 15A and the upper end side of the second frame portion 15B are connected by the third frame portion 15C, and the lower end side of the first frame portion 15A and the second frame portion 15B. Is connected to the lower end side of the above by a fourth frame portion 15D (see FIG. 2).

As shown in FIG. 2, a hinge portion 14B that allows the movable plate portion 14 to swing on the rear side of the seat, that is, on the headrest main body 11 side is provided at the lower end of the movable plate portion 14. That is, the movable plate portion 14 can be rotationally displaced in the front-rear direction of the seat with the hinge portion 14B as the rotation center axis.

The movable plate portion 14 is made of resin, and the hinge portion 14B, the fourth frame portion 15D (frame portion 15), and the movable plate portion 14 are integrally molded products integrally molded with resin. That is, the portion connecting the lower end of the movable plate portion 14 and the fourth frame portion 15D is a thin portion having a smaller thickness than the other portions.

Therefore, the thin-walled portion can exhibit flexibility, and thus functions as the hinge portion 14B. That is, the hinge portion 14B according to the present embodiment is composed of a so-called "integral hinge".

2.2 Support structure of the movable plate portion The upper end side of the movable plate portion 14 is held on the upper end side of the base frame 16 as shown in FIG. The base frame 16 is an example of an immovable portion that is immovable with respect to the headrest main body 11, and is a strength member fixed to the headrest main body 11.

As shown in FIG. 4, the base frame 16 according to the present embodiment is a frame-shaped frame made of resin or metal fixed to the headrest main body 11 on the lower end side and both end sides in the seat width direction. It is a strength member.

At least one locking portion 16A is provided on the upper end side of the base frame 16. The locking portion 16A is a protruding portion that can be locked with the locked portion 14C provided on the movable plate portion 14.

In this embodiment, the two locking portions 16A are provided at positions shifted in the seat width direction. That is, the pair of locking portions 16A are arranged so that the front end positions of the projected pair of locking portions 16A overlap when projected onto a virtual vertical plane parallel to the seat front-rear direction.

The locked portion 14C is formed of a U-shaped or V-shaped recess recessed from the rear end of the seat to the front of the seat on the upper end side of the movable plate portion 14. In the present embodiment, before the load F acts on the movable plate portion 14, the bottom wall located on the seat front side of each locked portion 14C and each locking portion 16A are in a non-contact state. There is.

The pair of locking portions 16A are set to a strength that causes shear fracture when a load F exceeding a predetermined size acts on the locking portions 16A via the movable plate portion 14. That is, the pair of locking portions 16A are solid round bar-shaped protrusions.

The cross-sectional area of the pair of locking portions 16A is such that the shear fracture occurs when a shearing force exceeding the load F is applied. In this embodiment, the pair of locking portions 16A and the base frame 16 are integrally molded products made of resin.

3. 3. Features of the headrest according to the present embodiment 3.1 Operation when a load F acts on the movable plate portion (receiving surface) In the present embodiment, a load F exceeding a predetermined size is applied to the movable plate portion 14 (receiving surface). When a shearing force of a magnitude exceeding the breaking shear force of each locking portion 16A is generated in each locking portion 16A by acting on 14A), the locking portion 16A is sheared and broken as shown in FIG. To do.

Then, in the state where the pair of locking portions 16A are broken, the upper end side of the movable plate portion 14 moves to the rear side of the seat as compared with before the pair of locking portions 16A are broken. Therefore, the movable plate portion 14 is supported by the base frame 16 in a state where the inclination angle θ (see FIG. 2) of the receiving surface 14A is smaller than before the pair of locking portions 16A are broken. It becomes.

That is, the headrest main body 11 receives the load F via the base frame 16. Then, when a load F exceeding a predetermined size acts on the movable plate portion 14, the locking portions 16A are sheared and fractured in pairs, and the movable plate portion 14 swings around the hinge portion 14B behind the seat. Rotationally displaced to the side.

When the locking portions 16A are sheared and broken in pairs, the movable plate portion 14 abuts on the upper end side of the base frame 16 and comes into contact with the movable plate portion 14, so that the movable plate portion 14 is rotationally displaced and tilted toward the rear side of the seat (hereinafter, also referred to as a backward tilted state). It becomes.).

The inclination angle θ of the receiving surface 14A is an angle formed by the virtual horizontal plane and the receiving surface 14A, and is an angle from the receiving surface 14A toward the rear side of the seat. That is, in the present embodiment, when the pair of locking portions 16A are sheared and fractured, the receiving surface 14A is tilted backward so that the inclination angle θ becomes small.

3.2 Effect of the above operation, etc. In this embodiment, when a load F exceeding a predetermined size acts on the movable plate portion 14, the movable plate portion 14 is compared with before the load F acts on the headrest. Can be tilted backwards. Therefore, the impact can be appropriately absorbed and mitigated.

That is, by breaking the pair of locking portions 16A so as to be sheared and broken, the impact energy that causes the load F can be absorbed and relaxed. Then, since the movable plate portion 14 tilts backward when the impact energy is absorbed, the head of the seated person can be maintained in an appropriate support state according to the change in posture.

In the initial stage where the load F acts, the forward tilted state in which the tilt angle is relatively large is preferable, and in the final stage, the tilt angle is preferably smaller than in the initial stage. On the other hand, in the present embodiment, since the inclination angle is smaller than that in the initial stage in the final stage, it is possible to always maintain a state in which the head of the seated person can be appropriately supported.

On the lower end side of the movable plate portion 14, a hinge portion 14B that allows the movable plate portion 14 to swing toward the rear side of the seat is provided. As a result, the position on the lower end side of the movable plate portion 14 is constrained, so that the movable plate portion 14 can be reliably tilted backward.

(Second Embodiment)
1. 1. Characteristic configuration of the headrest 1 according to the present embodiment As shown in FIG. 6, the present embodiment is provided with a pair of second locking portions 16B and a pair of second locked portions 14D. The pair of second locking portions 16B is when a load F exceeding a predetermined size acts on the second locking portion 16B via the movable plate portion 14, and the locking portion 16A ( Hereinafter, the first locking portion 16A) is configured to break after breaking.

That is, the pair of second locking portions 16B are protrusion-shaped portions provided on the upper end side of the base frame 16 like the pair of first locking portions 16A. The pair of second locked portions 14D is also composed of recesses provided in the movable plate portion 14 like the pair of first locked portions 14C.

Then, in a state where the load F does not act on the movable plate portion 14, the distance d1 has a dimension smaller than the distance d2. The distance d1 refers to the distance between the pair of first locking portions 16A and the pair of first locked portions 14C in the front-rear direction of the seat. The distance d2 refers to the distance between the pair of second locking portions 16B and the pair of second locked portions 14D in the front-rear direction of the seat.

As shown in FIG. 7, the plate portion 14E provided with the first locked portion 14C and the second locked portion 14D is composed of a metal plate which is a separate member from the movable plate portion 14. The resin movable plate portion 14 is provided with fixing portions 14F to 14H for fixing the metal plate portion 14E.

The fixed portions 14F to 14H are portions having a substantially L-shaped cross-sectional shape, and by sandwiching the plate portion 14E from the front and back of the sheet in cooperation with the movable plate portion 14, the plate portion 14E can be transferred to the movable plate portion 14. Fix to.

Since the same configuration requirements and the like as those in the above-described embodiment are designated by the same reference numerals as those in the above-described embodiment, duplicate description will be omitted.
2. 2. Features of the headrest 1 according to the present embodiment In the present embodiment, after the pair of first locking portions 16A is sheared and broken, the pair of second locking portions 16B receives a load F. Therefore, it is possible to prevent the movable plate portion 14 from being further tilted toward the rear side of the seat after the pair of first locking portions 16A are sheared and broken.

Further, in the present embodiment, since the plate portion 14E provided with the first locked portion 14C and the second locked portion 14D is formed of a metal plate, the movable plate portion 14 is the first locking portion. It is possible to prevent the 16A and the second locking portion 16B from being destroyed before they are destroyed.

(Third Embodiment)
In this embodiment, as shown in FIG. 8, guide plates 16C and 16D for sandwiching the plate portion 14E from the vertical direction are provided on the base frame 16. The guide plate 16C is a strip-shaped portion arranged on the upper side of the plate portion 14E and extending in the sheet width direction. The guide plate 16D is a strip-shaped portion arranged on the lower side of the plate portion 14E and extending in the sheet width direction.

A pair of locking portions 16A and a second locking portion 16B are provided so as to connect the guide plates 16C and 16D. The pair of locking portions 16A and the second locking portion 16B, and the guide plates 16C and 16D are integrally molded products integrally molded with resin together with the base frame 16.

As described above, in the present embodiment, the load F acting on the movable plate portion 14 can be reliably acted as a shearing force on the first locking portion 16A and the second locking portion 16B, and thus is determined in advance. The first locking portion 16A and the second locking portion 16B can be broken by the applied load F.

That is, when the load F acts on the movable plate portion 14, for example, the portion where the first locking portion 16A and the first locked portion 14C come into contact with each other is large from the root side of the first locking portion 16A. If it is deviated, the first locking portion 16A may be broken by the bending stress due to the bending moment instead of the shearing force.

Since the breaking strength due to bending stress and the breaking strength differ depending on the shearing force, there is a possibility that the first locking portion 16A will not break under a predetermined load F. On the other hand, in the present embodiment, the guide plates 16C and 16D for sandwiching the plate portion 14E from the vertical direction are provided.

As a result, it is possible to prevent the portion of contact between the first locking portion 16A and the first locked portion 14C from being significantly displaced from the root side of the first locking portion 16A.
Therefore, the load F acting on the movable plate portion 14 can be surely acted as a shearing force on the first locking portion 16A and the second locking portion 16B, so that the load F is determined in advance. The 1 locking portion 16A and the 2nd locking portion 16B can be broken.

Since the same configuration requirements and the like as those in the above-described embodiment are designated by the same reference numerals as those in the above-described embodiment, duplicate description will be omitted. The present embodiment can also be applied to the first embodiment.
(Other embodiments)
In the above-described embodiment, the frame portion 15 is immovable with respect to the headrest main body 11. However, the invention disclosed in the present specification is not limited to this. That is, for example, the frame portion 15 may be abolished, or the frame portion 15 may be displaced with respect to the headrest main body 11 together with the movable plate portion 14.

In the above-described embodiment, the hinge portion 14B by the integral hinge is provided. However, the invention disclosed in the present specification is not limited to this. That is, for example, the hinge portion 14B may be abolished, or the movable plate portion 14 manufactured as a separate member from the frame portion 15 may be swingably connected to the frame portion 15 by a pin or the like.

In the above-described embodiment, the pair of locking portions 16A and the pair of locked portions 14C are in a non-contact state before a load F exceeding a predetermined size acts on the movable plate portion 14. It was.

However, the invention disclosed in the present specification is not limited to this. That is, for example, before the load F acts on the movable plate portion 14, the pair of locking portions 16A and the pair of locked portions 14C may be in contact with each other at a predetermined contact surface pressure or less.

In the above embodiment, a pair of locking portions 16A and a pair of locked portions 14C are provided. However, the invention disclosed in the present specification is not limited to this. That is, for example, it is sufficient if at least one locking portion 16A and a locked portion 14C are provided. Further, a third locking portion and a third locked portion may be provided.

The locking portions 16A and 16B according to the above-described embodiment are convex, and the locked portions 14C and 14D according to the above-described embodiment are U-shaped or V-shaped concave portions. However, the invention disclosed in the present specification is not limited to this. That is, for example, the locked portions 14C and 14D may be convex, and the locking portions 16A and 16B may be U-shaped or V-shaped recesses.

In the above-described embodiment, the locking portion 16A has a shape protruding upward on the upper end side of the base frame 16. However, the invention disclosed in the present specification is not limited to this. That is, for example, the base frame 16 may have a protruding shape protruding in the seat width direction on the end side in the seat width direction.

In the above-described embodiment, the locking portions 16A and 16B are provided on the base frame 16. However, the invention disclosed in the present specification is not limited to this. That is, for example, the headrest main body 11 may be directly provided with the locking portions 16A and 16B.

The locking portions 16A and 16B according to the above-described embodiment were simple cylindrical or cylindrical shapes. However, the invention disclosed in the present specification is not limited to this. That is, for example, the locking portions 16A and 16B may be provided with cutout portions as shear promoting portions for promoting shear fracture.

In the above-described embodiment, the vehicle seat according to the present invention is applied to an ordinary passenger car. However, the application of the present invention is not limited to this, and can be applied to other seats for automobiles or seats used for vehicles such as railroad vehicles, ships and aircraft.

Furthermore, the present invention is not limited to the above-described embodiment as long as it conforms to the gist of the invention described in the claims. Therefore, at least two of the plurality of embodiments described above may be combined.

1 ... Vehicle seat 3 ... Seat cushion 5 ... Seat back 5A ... Back frame 10 ... Headrest 11 ... Headrest body 11A ... Stay part 12 ... Front side plate 12B ... Front pad 13 ... Rear side cover 14 ... Movable plate part 14B ... Hinge Part 14C ... Locked part 14A ... Receiving surface 14D ... Second locked part 14E ... Plate part 16 ... Base frame 16A ... Locking part 16B ... Second locking part 16C, 16D ... Guide plate

Claims (2)

In the headrest that is attached to the vehicle seat and supports the head of the seated person
The headrest body that can receive the load from the front side of the seat to the rear side of the seat,
A movable plate portion arranged on the front side of the seat of the headrest main body, which has a receiving surface for receiving the load and is displaceable with respect to the headrest main body.
A locked portion provided on the headrest main body or a portion immovable with respect to the headrest main body and provided on the movable plate portion and a locking portion that can be locked are provided.
The locking portion has a strength to break when the load exceeding a predetermined size is applied through the movable plate portion.
Further, in the movable plate portion, when the locking portion is broken, the upper end side of the movable plate portion moves to the rear side of the seat as compared with before the locking portion is broken, and the receiving surface is inclined. A headrest that is supported by the headrest body or the immovable portion in a state where the angle is changed. When the locked portion is the first locked portion and the locked portion is the first locked portion,
A protruding second locking portion that can be locked with a second locked portion provided on the movable plate portion is provided at the headrest main body or a portion that is immovable with respect to the headrest main body.
The second locking portion is configured to break after the first locking portion breaks when the load exceeding a predetermined size acts on the movable plate portion. The headrest according to claim 1.