JP2023138752A - Vehicular seat - Google Patents

Abstract

To provide a vehicular seat which suppresses the sinking of a chest part and reduces a load applied on a neck part, regardless of a physique of an occupant upon a rear surface collision.SOLUTION: A vehicular seat S is a vehicular seat S equipped with a seat back S2. The seat back S2 has a seat back frame 1, and a cushion pad 2 placed on the seat back frame 1. The cushion pad 2 is supported by an installation member 17 attached to the seat back frame 1. The cushion pad 2 is formed with an easy-to-bend part 22 for lowering reaction force applied on a chest part of an occupant when a backward moving load is applied on the occupant, and the easy-to-bend part 22 is configured to easily bend as compared with a periphery of the easy-to-bend part 22, and is equipped with a chest part supporting member 3 for suppressing the sinking of a chest part of the occupant at a position opposite to the easy-to-bend part 22. A lower end of the chest part supporting member 3 is provided above an upper end of the installation member 17.SELECTED DRAWING: Figure 4

Description

The present invention relates to a vehicle seat, and more particularly to a vehicle seat that can protect the neck of an occupant when an impact such as a collision occurs.

2. Description of the Related Art There has been a vehicle seat equipped with an active headrest for protecting an occupant's neck from impact and suppressing whiplash in the event of a rear collision in a vehicle (Patent Document 1).

JP2009-67247A

During a rear-end collision (rear-end collision), when a backward moving load is applied to the occupant, the phase difference between the neck and thorax ( Anteroposterior misalignment) may occur, resulting in whiplash. In particular, smaller occupants were more likely to sink into the seatback than larger occupants, and were therefore more likely to suffer from whiplash.

Conventionally, attempts have been made to appropriately support the occupant's head in order to suppress the occurrence of whiplash, but in the present invention, it is possible to appropriately restrain both the occupant's head and chest in the event of a rear collision. We focused on the desirability of In order to reduce the burden on the neck, we focused on the importance of preventing the chest from sinking while supporting the head.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a vehicle that suppresses the sinking of the chest and reduces the burden on the neck in the event of a rear-end collision, regardless of the physique of the occupant. The purpose is to provide seats.

According to the vehicle seat of the present invention, the problem is solved by a vehicle seat including a seat back, the seat back including a seat back frame and a cushion pad placed on the seat back frame. The cushion pad is supported by a support member attached to the seat back frame, and the cushion pad is configured to reduce a reaction force acting on the chest of the occupant when a backward moving load is applied to the occupant. A reaction force reducing portion is formed, and the reaction force reducing portion is configured to be more flexible than the surroundings of the reaction force reducing portion, and the occupant's chest sinks at a position facing the reaction force reducing portion. This problem is solved by providing a subsidence suppressing member for suppressing the subsidence, and the lower end of the subsidence suppressing member is provided above the upper end of the support member.

In the vehicle seat of the present invention configured as described above, when a rearward movement load is applied to the occupant, such as in the event of a rear-end collision, the depression suppression member provided at an appropriate position prevents the occupant's chest from sinking. Since this suppresses the stress on the neck, it is possible to reduce the burden on the neck. In addition, since the cushion pad is provided with a reaction force reducing part, even if a sinking suppression member is provided, it is possible to reduce the reaction force generated in the chest of the occupant, especially in the chest of a small passenger. .

Further, in the above configuration, the seat back includes a skin covering the cushion pad and a skin attachment member for attaching the skin to the cushion pad, and a skin that extends in the width direction of the vehicle seat. A mounting member is preferably provided, and the lower end of the sinking suppressing member is preferably provided above the skin mounting member.
In the above configuration, the sinking suppression member is placed at an appropriate height position in the seatback, so when a rearward movement load is applied to the occupant, such as in the event of a rear-end collision, the occupant's chest sinks. It becomes possible to appropriately suppress it.

Further, in the above configuration, the seat back frame includes a pair of side frames spaced apart from each other in the width direction of the vehicle seat, and an upper frame connecting upper ends of the side frames, The sinking suppression member may be attached to the side frame at an end in the width direction of the vehicle seat.
In the above configuration, since both ends of the sinking suppression member are attached to the seat back frame, when the occupant's chest sinks, it is possible to absorb the backward movement load, thereby preventing the occupant's chest from sinking. can be reliably suppressed.

Further, in the above configuration, the seat back has a side support member for laterally supporting the chest of the occupant, and the side support member is connected to the side frame in the width direction of the vehicle seat. It is preferable that the cushion pad is disposed between the cushion pads.
In the above configuration, when a backward movement load acts on a large-sized occupant, it is possible to disperse the backward movement load by preventing the occupant's chest from sinking from the side. Even for the occupants, it is possible to prevent the chest from sinking.

Further, in the above configuration, it is preferable that the sinking suppressing member is integrated with the side support member.
In the above configuration, the integrated sinking suppression member and side support member can prevent the occupant's chest from sinking from the rear (back) and sides (sides), so the backward moving load It is possible to disperse the particles appropriately, and there is no need to separately attach a side support member, improving work efficiency.

Further, in the above configuration, it is preferable that the upper frame includes a pillar support portion for guiding the headrest pillar, and that the pillar support portion and the sinking suppression member are integrated.
In the above configuration, the sinking suppressing member is integrated with the pillar support part, and the sinking suppressing member is stably attached to the seat back frame, so when the occupant's chest sinks, it will move backward. It is possible to firmly support the load.

Further, in the above configuration, the reaction force reducing portion is located on the inner side in the width direction of the vehicle seat than the hanging portion formed in the cushion pad so as to extend along the vertical direction of the vehicle seat. It would be good if it was set up in
In the above configuration, the reaction force reducing part is placed near the center in the seat width direction, so when the occupant's chest sinks, it is possible to receive the backward movement load near the center in the seat width direction. Become.

Further, in the above configuration, it is preferable that the sinking suppressing member extends longer than the length of the reaction force reducing portion in the vertical direction of the vehicle seat.
In the above configuration, the sinking suppressing member is arranged in the vertical direction of the seat on the back surface of the area where the reaction force is reduced, so that it reduces the reaction force generated in the occupant's chest and prevents the occupant's chest from sinking. It becomes possible to appropriately suppress it.

Further, in the above configuration, it is preferable that a recessed portion is disposed at a position behind the reaction force reducing portion in the cushion pad.
With the above configuration, the reaction force reducing portion can be formed by a simple method of cutting out the core of the cushion pad.

Further, in the above configuration, it is preferable that a material having at least one of density and hardness different from the material constituting the cushion pad is disposed at a position behind the reaction force reducing portion in the cushion pad.
In the above configuration, the reaction force reducing portion is formed by using a material of a part of the cushion pad that has a different density or hardness from the urethane base material (urethane foam) that constitutes the cushion pad. By selecting appropriate materials, it is possible to set desired reaction force reduction characteristics.

According to the seat frame of the present invention, when a rearward movement load acts on the occupant, such as in the event of a rear-end collision, the sinking suppression member provided at an appropriate position suppresses the sinking of the occupant's chest. It becomes possible to reduce the burden on the neck. In addition, since the cushion pad is provided with a reaction force reducing part, even if a sinking suppression member is provided, it is possible to reduce the reaction force generated in the chest of the occupant, especially in the chest of a small passenger. .
Furthermore, according to the seat frame of the present invention, the sinking suppressing member is placed at an appropriate height position in the seat back, so when a rearward movement load is applied to the occupant, such as in the event of a rear-end collision, the occupant It becomes possible to appropriately suppress the sinking of the chest.
Further, according to the seat frame of the present invention, since both ends of the sinking suppression member are attached to the seat back frame, when the occupant's chest sinks, it is possible to absorb the backward movement load, and the occupant This makes it possible to reliably prevent the chest from sinking.
Further, according to the seat frame of the present invention, when a backward movement load acts on a large occupant, it is possible to disperse the backward movement load by preventing the occupant's chest from sinking from the side. This makes it possible to prevent the chest from sinking even if the occupant is large.
Further, according to the seat frame of the present invention, it is possible to prevent the occupant's chest from sinking from the rear (back) and side (side) by the integrated sinking suppressing member and side support member. Therefore, it is possible to appropriately disperse the backward movement load, and there is no need to separately attach a side support member, improving work efficiency.
Further, according to the seat frame of the present invention, the sinking suppressing member is integrated with the pillar support portion, and the sinking suppressing member is stably attached to the seat back frame, so that the occupant's chest sinks. At times, it becomes possible to firmly absorb the backward movement load.
Furthermore, according to the seat frame of the present invention, since the reaction force reducing portion is arranged near the center in the seat width direction, when the occupant's chest sinks, the backward movement load is applied near the center in the seat width direction. It becomes possible to accept it.
Further, according to the seat frame of the present invention, since the sinking suppressing member is arranged in the seat vertical direction on the back surface of the area where the reaction force is reduced, the reaction force generated in the chest of the occupant is reduced, and the It becomes possible to appropriately suppress the sinking of the chest.
Further, according to the seat frame of the present invention, the reaction force reducing portion can be formed by a simple method of cutting out the core of the cushion pad.
Further, according to the seat frame of the present invention, the reaction force reducing portion is formed by making a part of the cushion pad material different in density or hardness from the urethane base material (urethane foam) constituting the cushion pad. By selecting an appropriate material, it is possible to set the desired reaction force reduction characteristics.

1 is an external view of a vehicle seat according to an embodiment of the present invention. FIG. 1 is a perspective view of a seat back frame of a vehicle seat according to an embodiment of the present invention. FIG. 2 is a perspective explanatory view showing the relationship between a seat frame and a seat cushion of a vehicle seat according to an embodiment of the present invention. FIG. 2 is a sectional view taken along the line AA in FIG. 1, and is an explanatory diagram showing the structure of a seat back according to an embodiment of the present invention. FIG. 4 is a sectional view taken along line BB in FIG. 3, and is an explanatory diagram showing the structure of a seat back according to an embodiment of the present invention. FIG. 2 is a sectional view taken along the line AA in FIG. 1 and is an explanatory diagram showing the structure of a seat back according to a modification of the embodiment of the present invention. FIG. 7 is a perspective view of a seat back frame according to a modification of the embodiment of the present invention. FIG. 4 is a sectional view taken along line BB in FIG. 3 and is an explanatory diagram showing the structure of a seat back according to a modification of the embodiment of the present invention.

Hereinafter, a seat frame according to an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described with reference to FIGS. 1 to 8. The vehicle seat according to the present embodiment will be described using a vehicle seat installed in a vehicle as an example, but is not limited to a vehicle seat, and is not limited to a vehicle seat installed in a vehicle other than a vehicle. It may be.

Note that the embodiments described below are merely examples for facilitating understanding of the present invention, and do not limit the present invention. That is, the shapes, dimensions, arrangement, etc. of the members described below may be changed and improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents thereof.

Regarding terms indicating directions in this specification, each direction is defined as shown in FIG. Specifically, in the following description, "front-back direction" means the front-back direction when viewed from the person sitting in the vehicle seat, and is a direction that coincides with the traveling direction of the vehicle. The term "seat width direction" refers to the width direction of the vehicle seat, which corresponds to the left-right direction when viewed from the person sitting on the vehicle seat. Furthermore, the term "vertical direction" refers to the height direction of the vehicle seat, and corresponds to the vertical direction when the vehicle seat is viewed from the front.

[1. Configuration of vehicle seat S]
The vehicle seat S according to this embodiment has an appearance illustrated in FIG. 1 . FIG. 1 is a diagram showing the appearance of a vehicle seat S. As shown in FIG. Note that in FIG. 1, a portion of the vehicle seat S (specifically, a portion of the seat back S2) is shown with a trim cover removed for convenience of illustration.

The vehicle seat S includes a seat cushion S1 that serves as a sitting part that supports the buttocks of the seated person, a seatback S2 that serves as a backrest that supports the back of the seated person, and a seat cushion S2 that serves as a backrest portion that supports the back of the seated person. The main component is a headrest S3 that supports the headrest S3. The seat cushion S1 is constructed by placing a cushion pad on a seat cushion frame (not shown) and further covering the cushion pad with a trim cover. The seat back S2 is constructed by placing a cushion pad 2 on a seat back frame 1, which is a skeleton shown in FIG. 2, and covering it with a trim cover T. The headrest S3 is formed by arranging a padding material (not shown) on a core material (not shown) and covering it with a trim cover.

The cushion pad of the seat cushion S1 and the seat back S2 is a urethane base material formed by foam molding using a urethane foam material. The trim cover T of the seat back S2 includes a first hanging part Ta (right hanging part) provided on the right side of the seat back and extending in the vertical direction, and a second hanging part Ta (right hanging part) provided on the left side of the seat back and extending in the vertical direction. A hanging part Tb (left hanging part), a third hanging part Tc (upper hanging part) provided on the upper side of the seat cushion and extending in the seat width direction, and a third hanging part Tc (upper hanging part) provided on the lower side of the seat cushion and extending in the seat width direction. An extending fourth hanging portion Td (lower hanging portion) is provided. Further, as will be described later, thin portions each having a thickness thinner than the surrounding portions are provided at positions corresponding to each hanging portion of the cushion pad 2.

[2. Seat back frame]
The configuration of the seat back frame 1 will be described with reference to FIG. 2. The seat back frame 1 includes a pair of side frames 10 that are spaced apart from each other in the left and right directions and extend in the vertical direction, an upper frame 11 that connects the upper ends of the side frames 10, and a lower end of the side frames 10. The lower frame 12 constitutes a frame shape.

The upper frame 11 is provided with a pillar support section 13, and the pillar support section 13 is provided with a headrest frame (not shown). The headrest S3 is configured by providing a cushion pad on the outside of the headrest frame.

The side frame 10 is formed by pressing a sheet metal, and is made of a substantially curved plate whose width is wider at the bottom than at the top. As shown in FIG. 2, there is a substantially flat side plate 14, a front edge 15 formed by folding the front end of the side plate 14 inward in a U-shape, and a rear end bent inward in an L-shape. It has a rear edge portion 16. The side frame 10 is provided with a locking portion 18 having locking holes into which both ends of a construction member 17, which serves as a pair of support members made of S springs that support the cushion pad 2 from the rear, are locked. Two construction members are provided in the vertical direction: an upper construction member 17a on the upper side and a lower construction member 17b on the lower side.

Further, a chest support member 3, which will be described in detail below, is installed above the seat back frame 1.

[3. Seat back configuration]
Each configuration of the seat back S2 of the vehicle seat S according to the present embodiment will be described below. Specifically, when a rearward movement load acts on the occupant, such as in the event of a rear-end collision, the sinking suppressing member (chest support member 3) suppresses the sinking of the occupant's chest; The reaction force reducing portion (flexible portion 22) for reducing the force and the side support member (side pad 4) for laterally supporting the chest of the occupant will be explained with reference to FIGS. 2 to 5.

(3.1. Chest support member)
As shown in FIG. 2, the seat back S2 of the vehicle seat S according to the present embodiment has a sinking structure for suppressing the sinking of the occupant's chest when a backward movement load acts on the occupant, such as in the event of a rear-end collision. It is provided with a chest support member 3 which is a restraining member. The chest support member 3 is a plate member made of resin or the like, and has a generally rectangular shape in front view with a rib portion on the surface. Left and right end portions (right end portion 3 a and left end portion 3 b ) of the chest support member 3 in the seat width direction are attached to left and right side frames 10 of the seat back frame 1 . Specifically, the right end 3a of the chest support member 3 is attached to the right side frame 10, and the left end 3b is attached to the left side frame 10.

The chest support member 3 is arranged such that the lower end 3d is located above the upper end of the construction member 17 provided above, that is, the upper construction member 17a. With the chest support member 3 disposed at such a position in the seat back frame 1, it is possible to suppress the occupant's chest from sinking in at an appropriate position. Further, the upper end portion 3c of the chest support member 3 is arranged at a position where it does not interfere with other members such as the pillar support portion 13.

Further, since the chest support member 3 is provided so as to be located only above the upper end of the upper construction member 17a, it is possible to appropriately suppress the depression of the occupant's chest. Furthermore, it becomes possible to arrange the chest support member 3 without interfering with other members provided on the seat back S2.

(3.2. Reaction force reduction part)
As shown in FIGS. 3 and 4, the seat back S2 of the vehicle seat S according to the present embodiment reduces the reaction force that acts on the occupant's chest when a backward movement load acts on the occupant, such as in the event of a rear-end collision. It is provided with a flexible portion 22 which is a reaction force reducing portion. FIG. 3 is a perspective explanatory view showing a partially cut away state of the seat back S2, and FIG. 4 is a cross-sectional view taken along line AA in FIG. As shown in FIGS. 3 and 4, a recess 21 is provided by cutting out a core at a position facing the chest support member 3 of the cushion pad 2 constituting the seat back S2, and on the front side of the recess 21 in the front-rear direction of the seat, A flexible portion 22 is formed.

The easily deflectable portion 22 is configured to be more easily deflected than the periphery of the easily deflectable portion 22 due to the recess 21 provided at the rear in the front-back direction of the seat, and when a backward movement load is applied to the occupant in the event of a rear collision, etc. When the occupant's chest sinks, it is possible to reduce the reaction force generated in the occupant's chest. When the chest support member 3 is provided, it is assumed that when the passenger's chest sinks during a rear collision, the reaction force generated on the passenger's chest will increase, but since the easily deflectable portion 22 is provided, , it becomes possible to suppress the reaction force generated in the chest of the occupant.

In particular, for small-sized occupants, the acceleration generated during a rear collision is large, and the reaction force generated on the chest becomes large. However, since the part 22 that is easily deflected is provided to reduce the reaction force, the reaction force is appropriately generated on the chest. It becomes possible to reduce the reaction force.

As shown in FIG. 4, the cushion pad 2 is provided with thin parts 23 and 24 at positions corresponding to hanging parts formed to extend along the vertical direction of the seat back S2. Specifically, a thin wall portion 23 is provided at a position corresponding to the first hanging portion Ta of the cushion pad 2, and a thin wall portion 24 is provided at a position corresponding to the second hanging portion Tb. The recessed portion 21 and the flexible portion 22 are provided on the inner side in the seat width direction than the right thin portion 23 and the left thin portion 24. That is, the recessed portion 21 and the easily bendable portion 22 are provided inside the first hanging portion Ta and the second hanging portion Tb in the sheet width direction. In other words, the flexible portion 22 is arranged near the center of the seat back S2 in the seat width direction. Therefore, when the occupant's chest sinks, the vicinity of the center of the seat back S2 tends to sink, so that the load of backward movement can be received at the vicinity of the center in the width direction of the seat.

(3.3. Side support member)
As shown in FIGS. 3 and 4, the seat back S2 of the vehicle seat S according to the present embodiment supports the occupant's chest from the side when a backward moving load acts on the occupant, such as in the event of a rear collision. It has a side pad 4 which is a side support member. The side pads 4 are made of resin or the like, and one is provided on each side in the width direction of the seat. Specifically, the side pad 4 is arranged between the side frame 10 and the cushion pad 2 in the seat width direction. Specifically, the side pad 4 is arranged between the side plate 14 of the side frame 10 and the cushion pad 2 in the seat width direction.

The seatback S2 of this embodiment includes a portion 22 that is easily bent, and is capable of reducing the reaction force generated in the chest of the occupant in the event of a rear collision. There is a possibility that the sinking will become larger. The seat back S2 of this embodiment is provided with side pads 4, which prevent the chest of a large occupant from sinking from the left and right sides in the seat width direction in the event of a rear-end collision, thereby preventing the occupant from retreating. It is possible to disperse the moving load. Therefore, even if the occupant is of a large physique, it is possible to prevent the chest from sinking.

Further, as shown in FIG. 5, which is a cross-sectional view taken along line BB in FIG. It extends longer than the length (l) of the recess 21 in the sheet vertical direction (L>l in FIG. 5). With this configuration, the chest support member 3 is disposed in the vertical direction of the seat on the back of the easily deflected portion 22, which is the area where the reaction force is reduced. It becomes possible to reduce the generated reaction force and to appropriately suppress the sinking of the occupant's chest.

Further, as shown in FIG. 5, an insert wire 26 is embedded in the cushion pad 2 of the seat back S2, which is a skin attachment member for attaching the skin covering the cushion pad 2 to the cushion pad 2. extending in the direction. The lower end of the chest support member 3 is provided above the insert wire 26. The position of the insert wire 26 is the height position of the third hanging part Tc (upper hanging part) which is a hanging part near the chest and extends in the seat width direction, in other words, the third hanging part Tc This corresponds to the height position where the thin-walled part 25 is provided, and the chest support member 3 is placed at an appropriate height position in the seatback S2. When a backward moving load is applied, it is possible to appropriately suppress the occupant's chest from sinking.

[4. Effect of suppressing chest sinking during a rear collision (when a backward moving load is applied)]
In the vehicle seat S of this embodiment, when a rearward movement load acts on the occupant such as in the event of a rear-end collision, both the head and chest of the occupant are appropriately restrained, and the neck and chest of the occupant are placed in the front and back of the seat. By suppressing directional deviation and reducing the burden on the neck of the occupant, it is possible to suppress the occurrence of whiplash.

Specifically, as shown in FIGS. 1 and 2, a headrest S3 is arranged at a position corresponding to the occupant's head, and a chest support member 3 is arranged at a position corresponding to the occupant's chest on the seat back S2. has been done. Therefore, when a rearward movement load is applied to the occupant, such as in the event of a rear-end collision, the occupant's head is prevented from moving backward by the headrest S3, and the occupant's chest is prevented from moving backward by the chest support member 3. Displacement is prevented.

At this time, there is a possibility that a large reaction force will be applied to the occupant due to the presence of the chest support member 3. In this embodiment, since the cushion pad 2 of the seat back S2 is provided with a portion 22 that is easily bent, it is possible to suppress the reaction force generated in the chest of the occupant. In particular, for a small-sized occupant (light-weight occupant), the acceleration generated during a rear collision will be large, so a large reaction force may be applied to the occupant. This makes it possible to suppress the reaction force generated in the chest.

In addition, since the seat back S2 is provided with side pads 4 in the seat width direction, in the event of a rear-end collision, the chest of a large occupant is prevented from sinking from the left and right sides in the seat width direction, and the seat back is backed up. It is possible to disperse the moving load. Therefore, even if the occupant is of a large physique, it is possible to prevent the chest from sinking.

As described above, the vehicle seat S of the present embodiment suppresses the sinking of the occupant's chest when a rearward movement load acts on the occupant, such as during a rear collision, and also suppresses the reaction force generated against the chest. is appropriately suppressed. Therefore, by restraining the occupant's head and chest in the event of a rear-end collision, displacement of the occupant's neck and chest in the seat longitudinal direction is suppressed. Therefore, the burden on the neck of the occupant is reduced, making it possible to suppress the onset of whiplash. Furthermore, the vehicle seat S of the present embodiment can appropriately suppress the chest from sinking in both the case of a small-sized passenger and a large-sized passenger.

[5. Modified example]
The present invention is not limited to the embodiments described above. Below, modifications of this embodiment will be described based on FIGS. 6 to 8.

In the above embodiment, an example is shown in which the chest support member 3 and the side pads 4 are separate bodies, but as shown in FIG. 6, the chest support member 3X and the left and right side pads 4X may be integrated. By integrating the chest support member 3X and the side pads 4X, it is possible to prevent the occupant's chest from sinking from the rear (back) and side (side), so that the backward moving load can be appropriately handled. It is possible to disperse. Furthermore, there is no need to separately attach a side pad to the seat back frame 1, improving work efficiency.

In the embodiment described above, the chest support member 3 was provided separately from the pillar support section 13, but as shown in FIG. 7, the chest support member 3Y and the pillar support section 13 may be integrated. Since the chest support member 3Y and the pillar support part 13 are integrated, the chest support member 3Y is stably attached to the seatback frame 1, so that when the occupant's chest sinks, the backward movement of the chest support member 3Y is prevented. It is possible to firmly support the load.

In the above embodiment, the chest support member 3 is provided separately from the seatback frame 1, but the chest support member and the seatback frame 1 may be integrated. Specifically, the chest support member may be integrated with the upper frame 11, or the chest support member may be integrated with the left and right side frames 10. Since the chest support member and the upper frame 11 are integrated, the chest support member is stably arranged, so that when the chest of the occupant sinks, the load of the backward movement is firmly received from the rear. becomes possible.

In the above embodiment, the insert wire 26 is provided at a lower height position of the recess 21 provided in the cushion pad 2, but as shown in FIG. It may be provided at a position overlapping with the recess 21 provided in the cushion pad 2X. At this time, the protrusion 27 protrudes rearward in the recess 21. Therefore, the length (d1) of the recess 21 in the seat front-rear direction is longer than the length (d2) of the recess 21 in the seat front-rear direction at the portion where the protrusion 27 is provided (d1>d2). Further, the length (d3) of the recess 21 in the seat longitudinal direction at a position below the protrusion 27 of the recess 21 is also the length (d2) of the recess 21 in the seat longitudinal direction at the portion where the protrusion 27 is provided. (d3>d2).

In the above embodiment, the core of the cushion pad 2 constituting the seat back S2 is removed to form the recess 21 to provide the easily bendable portion 22 which is the reaction force reducing portion. However, the method of providing the reaction force reducing portion is However, the present invention is not limited to core cutting of cushion pads. For example, a material with a lower density than the material that makes up the cushion pad, such as a urethane base material (urethane foam), or a material with lower hardness is placed at the rear position where the reaction force reduction part of the cushion pad is formed. By doing so, it is also possible to provide a region that is more flexible than the surrounding area. When forming a region that is easy to bend using such a method, it is possible to set a desired reaction force reduction characteristic by selecting an appropriate material.

In the above embodiment, the side pad 4 was provided separately from the seat back frame 1, but the side pad and the seat back frame 1 may be integrated. Specifically, the side pads may be integrated with the upper frame 11, or the side pads may be integrated with the left and right side frames 10. Since the side pads and the upper frame 11 are integrated, the side pads are placed stably, so that when the occupant's chest sinks, the load from the backward movement can be firmly received from the side. becomes possible.

In addition, the side pad can be made harder than the surrounding area by injecting or permeating a hardening resin into the area corresponding to the occupant's chest in the cushion pad 2 of the seat back S2. be. By replacing the side pad in this manner, there is no need to prepare a separate side pad, and work efficiency is improved.

Further, in the above embodiment, an example was shown in which one side pad 4 was provided on each side in the seat width direction, but the number of side pads is not limited to this, and a plurality of side pads may be provided. It is also possible to provide them on the left and right sides in the sheet width direction. At this time, it is also possible to provide a plurality of side pads in a stacked manner.

In the embodiment described above, an example is shown in which the chest support member 3 and the side pads 4 are made of resin, but the material forming the chest support member 3 and the side pads 4 is not limited to resin. Although it is preferable to use resin from the viewpoint of weight reduction, for example, metal may be used instead of resin. When metal is used as the material constituting the chest support member 3 and the side pads 4, it is possible to ensure the necessary rigidity even if the chest support member 3 and the side pads 4 are made thin.

Furthermore, as the material constituting the chest support member 3 and the side pads 4, it is also possible to use a substance that is normally soft but exhibits dilatancy properties that harden when subjected to impact. When using a material that exhibits dilatancy properties, it does not cause the occupants, who are normally seated in a soft position, to feel any discomfort, but becomes hard during an impact such as a rear-end collision, effectively suppressing the sinking of the occupant's chest. becomes possible.

The shape of the chest support member 3 is not limited to a flat shape, and may have a curved shape that curves in the left-right direction (seat width direction). Specifically, the shape may be curved so that the right end 3a and left end 3b of the chest support member 3 are located forward of the center portion of the chest support member 3. Further, the chest support member 3 may have a curved shape that curves in the front-rear direction. Specifically, the shape may be such that the upper end 3c and lower end 3d of the chest support member 3 are curved so that they are positioned further back than the center portion of the chest support member 3. Furthermore, it is also possible to make the left and right side parts (the right end part 3a and the left end part 3b) of the chest support member 3 thicker, or to make the center part thicker.

The seat back according to the present embodiment has been described above, taking as an example the seat back of a vehicle seat mounted in a vehicle. The seat back according to the present embodiment is not limited to the seat back of a vehicle seat, but is applicable to a seat where a shock may occur to a seated person, particularly a seat that may sink into the seated person's chest when a shock occurs. There are no particular restrictions on the use as long as it is a seat back for the seat to be obtained. For example, the seat back of the present invention may be a seat mounted on a vehicle such as an aircraft or a ship, other than a ground traveling vehicle having wheels such as an automobile or a railway.

S Vehicle seat (vehicle seat)
S1 Seat cushion S2 Seat back S3 Headrest T Trim cover Ta First hanging part (right hanging part)
Tb Second hanging part (left hanging part)
Tc Third hanging part (upper hanging part)
Td Fourth hanging part (lower hanging part)
1 seat back frame 10 side frame 11 upper frame 12 lower frame 13 pillar support part 14 side plate 15 front edge 16 rear edge 17 construction member 17a upper construction member (support member)
17b Lower construction member (support member)
18 Locking part 2, 2X Cushion pad 21 Recessed part 22 Easily bent part (reaction force reduction part)
23 Thin wall portion 24 Thin wall portion 25 Thin wall portion 26 Insert wire (skin attachment member)
27 Projection parts 3, 3X, 3Y Chest support member (sinking prevention member)
3a Right end 3b Left end 3c Upper end 3d Lower end 4 Side pad (side support member)

Claims (10)

A vehicle seat including a seat back,
The seat back is
seat back frame,
a cushion pad placed on the seat back frame;
The cushion pad is supported by a support member attached to the seat back frame,
The cushion pad is formed with a reaction force reducing portion for reducing a reaction force acting on the chest of the occupant when a backward movement load is applied to the occupant;
The reaction force reducing portion is configured to be more flexible than the surroundings of the reaction force reducing portion,
a sinking suppressing member for suppressing sinking of the occupant's chest at a position facing the reaction force reducing portion;
A vehicle seat characterized in that a lower end of the sinking suppressing member is provided above an upper end of the supporting member. The seat back includes an outer skin covering the cushion pad;
a skin attachment member for attaching the skin to the cushion pad, the skin attachment member extending in the width direction of the vehicle seat;
2. The vehicle seat according to claim 1, wherein a lower end of the sinking suppression member is provided above the skin attachment member. The seat back frame includes a pair of side frames spaced apart from each other in the width direction of the vehicle seat;
an upper frame connecting the upper ends of the side frames;
3. The vehicle seat according to claim 1, wherein the sinking suppression member is attached to the side frame at an end in the width direction of the vehicle seat. The seat back has a side support member for supporting the occupant's chest from the side,
4. The vehicle seat according to claim 3, wherein the side support member is disposed between the side frame and the cushion pad in the width direction of the vehicle seat. 5. The vehicle seat according to claim 4, wherein the sinking prevention member is integrated with the side support member. The upper frame includes a pillar support portion for guiding a headrest pillar,
The vehicle seat according to any one of claims 3 to 5, wherein the pillar support portion and the sinking suppression member are integrated. The reaction force reducing portion is provided on the inner side in the width direction of the vehicle seat than the hanging portion formed in the cushion pad so as to extend along the vertical direction of the vehicle seat. A vehicle seat according to any one of claims 1 to 6. The vehicle seat according to any one of claims 1 to 7, wherein the sinking suppressing member extends longer than the length of the reaction force reducing portion in the vertical direction of the vehicle seat. The vehicle seat according to any one of claims 1 to 8, wherein a recessed portion is arranged at a position behind the reaction force reducing portion in the cushion pad. Any one of claims 1 to 9, wherein a material having at least one of density and hardness different from the material constituting the cushion pad is disposed at a position behind the reaction force reducing portion in the cushion pad. The vehicle seat described in paragraph 1.

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