JP2023104580A - Vehicular seat - Google Patents

Abstract

To provide a vehicular seat that can suppress the head of a seated occupant from burrowing into a headrest at rear collision of a vehicle.SOLUTION: A vehicular seat according to one embodiment in the disclosure comprises a headrest and a headrest frame supporting the headrest, which is constituted of pipe materials or rod materials. The headrest frame has a first stay and a second stay arranged in a seat width direction separately from each other, and a connection part connecting an upper end of the first stay to an upper end of the second stay in the seat width direction. The first stay and the second stay respectively have head part supporting parts extending downward from the upper ends and to a front side of the seat when viewed from the seat width direction, and leg parts extending downward from lower ends of the head part support parts. In the connection part, the whole of a central axis is curved to protrude upward.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to vehicle seats.

BACKGROUND ART In a vehicle seat, a headrest is supported by a headrest frame made of a tubular member or a bar (see Patent Document 1). The headrest frame has two vertically extending stays and a connecting portion connecting the stays at their upper ends.

Patent No. 6575408

In the conventional headrest frame, since the connecting portion at the upper end extends in the seat width direction, the head of the occupant tends to slip into the headrest when a collision occurs in the rear of the vehicle. As a result, the chin of the occupant may be pulled rearward as the occupant sinks into the seat back after the head sinks into the seat.

In the conventional headrest frame, in order to prevent the chin of the occupant from moving in the event of a rear collision, it is necessary to insert a resin plate or the like into the headrest to prevent the head from slipping into the interior of the headrest. This increases the cost of the vehicle seat.

An object of one aspect of the present disclosure is to provide a vehicle seat capable of suppressing the head of the occupant from slipping into the headrest in the event of a rear collision.

One aspect of the present disclosure is a seat cushion (2) and a seat back (3), a headrest (4), a headrest frame (6) supporting the headrest (4) and made of a tube or bar, A vehicle seat (1) comprising The headrest frame (6) includes a first stay (61) and a second stay (62) spaced apart from each other in the seat width direction, an upper end (61A) of the first stay (61) and a second stay (62). and a connecting portion (63) connecting the upper end (62A) of the in the seat width direction.

The first stay (61) and the second stay (62) respectively include head support portions (611, 621) extending downward and in front of the seat from upper ends (61A, 62A) when viewed in the seat width direction, and a head support portion (611, 621). and leg portions (612, 622) extending downward from the lower ends of the support portions (611, 621). The connecting portion (63) is curved along the entire central axis so as to protrude upward.

According to such a configuration, the entire central axis of the connecting portion (63) is curved, that is, the connecting portion (63) is configured only by the curved portion, so that the connecting portion (63) can move toward the inside. Sinking of the head of the seated person is suppressed. As a result, it is possible to prevent the head of a seated person from slipping into the headrest (4) without providing a support member such as a resin plate.

In one aspect of the present disclosure, the distance in the seat width direction between the central axis of the head support portion (611) of the first stay (61) and the central axis of the head support portion (621) of the second stay (62) is , may increase downward. According to such a configuration, the head of the seated person can be easily guided forward of the seat in the event of a rearward collision in the vehicle. As a result, it is possible to promote the effect of suppressing the head of the seated person from slipping into the headrest (4).

In one aspect of the present disclosure, the head support portions (611, 621) include upper portions (611A, 621A) extending downward from upper ends (61A, 62A) when viewed in the seat width direction, and upper portions (611A, 621A) extending downward when viewed in the seat width direction. and lower portions (611B, 621B) extending downward and forward of the seat from the lower ends of the upper portions (611A, 621A). The amount of change in the seat width direction distance along the vertical direction between the central axis of the lower portion (611B) of the first stay (61) and the central axis of the lower portion (621B) of the second stay (62) is It may be larger than the amount of change in the seat width direction distance along the vertical direction between the central axis of the upper portion (611A) of the stay (61) and the central axis of the upper portion (621A) of the second stay (62). . With such a configuration, the rigidity of the first stay (61) and the second stay (62) can be increased.

In one aspect of the present disclosure, the head support portions (611, 621) include upper portions (611A, 621A) extending downward from the upper ends (61A, 62A) and upper portions (611A, 621A) viewed from the seat width direction. ) extending downward and forward of the seat. The central axis of the upper portion (611A) of the first stay (61) and the central axis of the upper portion (621A) of the second stay (62) may be parallel. Even if the distance in the seat width direction between the central axis of the lower portion (611B) of the first stay (61) and the central axis of the lower portion (621B) of the second stay (62) increases downward, good. With such a configuration, it is possible to prevent the head of a seated person from entering between the first stay (61) and the second stay (62) in the event of a rearward collision of the vehicle. As a result, it is possible to promote the effect of suppressing the head of the seated person from slipping into the headrest (4).

In one aspect of the present disclosure, the radius of curvature of the central axis of the connecting portion (63) may be constant. With such a configuration, the dimension of the connecting portion (63) in the seat width direction can be minimized.

It should be noted that the symbols in each parenthesis above are examples showing the correspondence with specific configurations and the like described in the embodiments described later, and the present disclosure is limited to the specific configurations and the like shown in the symbols in the parentheses. not something.

FIG. 1 is a schematic perspective view showing a vehicle seat according to the embodiment. 2 is a schematic perspective view showing a headrest and a headrest frame in the vehicle seat of FIG. 1. FIG. 3A is a schematic front view of the headrest frame of FIG. 2, and FIG. 3B is a schematic side view of the headrest frame of FIG. 2. FIG. 4A is a schematic front view of a headrest frame in an embodiment different from FIG. 2, and FIG. 4B is a schematic side view of the headrest frame of FIG. 4A. 5A is a schematic front view of a headrest frame in an embodiment different from FIG. 2, and FIG. 5B is a schematic side view of the headrest frame of FIG. 5A.

Embodiments to which the present disclosure is applied will be described below with reference to the drawings.
[1. First Embodiment]
[1-1. composition]
A vehicle seat 1 shown in FIG. 1 includes a seat cushion 2, a seat back 3, a headrest 4, a back frame 5, and a headrest frame 6 (see FIG. 2).

The seat cushion 2 is a part for supporting the buttocks of the seated person. The seat back 3 is a part for supporting the back of the seated person. The headrest 4 is a part for supporting the head of the seated person. The back frame 5 supports the seat back 3.

The vehicle seat 1 is used as a passenger seat. The direction in the following description and each drawing means the direction when the vehicle seat 1 is assembled to a vehicle (that is, a passenger car). In this embodiment, the seat width direction coincides with the lateral direction of the vehicle, and the front of the seat coincides with the front of the vehicle.

<Headrest frame>
As shown in FIG. 2, the headrest frame 6 supports the headrest 4. As shown in FIG. The headrest frame 6 is composed of a single tube member or bar member that is bent at a plurality of points. In this embodiment, the headrest frame 6 is configured as a cylinder whose outer diameter does not change along the axial direction (that is, has a constant outer diameter).

The headrest frame 6 is plane-symmetrical (that is, left-right symmetrical) with respect to a plane of symmetry including the central axis of the headrest 4 in the seat width direction. The headrest frame 6 has a first stay 61 , a second stay 62 and a connecting portion 63 .

<Stay>
The first stay 61 and the second stay 62 are portions extending in at least the vertical direction when viewed from the front of the seat.

The first stay 61 and the second stay 62 are arranged apart from each other in the seat width direction so as to face each other in the seat width direction. The first stay 61 is arranged on the right side of the second stay 62 .

(1st stay)
As shown in FIGS. 3A and 3B, the first stay 61 has a first head support portion 611 and first leg portions 612 .

The first head support portion 611 is a portion including the upper end 61A of the first stay 61 (that is, the boundary with the connecting portion 63). The first head support portion 611 is arranged inside the headrest 4 . The first head support portion 611 extends downward and forward of the seat from the upper end 61A of the first stay 61 when viewed in the seat width direction.

Specifically, the first head support portion 611 has a first upper portion 611A and a first lower portion 611B. The first upper portion 611A extends downward from the upper end 61A of the first stay 61 when viewed in the seat width direction.

When viewed from the front of the seat (see FIG. 3A), the first upper portion 611A extends downward in a direction away from the central axis of the headrest 4 in the seat width direction. When viewed from the sheet width direction (see FIG. 3B), the first upper portion 611A extends substantially vertically. That is, the first upper portion 611A extends downward to the right from the upper end 61A.

The first lower portion 611B extends downward and forward from the lower end of the first upper portion 611A when viewed in the seat width direction. That is, the first head support portion 611 is curved at the connecting point between the first upper portion 611A and the first lower portion 611B.

When viewed from the front of the seat (see FIG. 3A), the first lower portion 611B extends downward in a direction away from the central axis of the headrest 4 in the seat width direction. The angle formed by the central axis of the first lower portion 611B with the vertical direction (that is, the inclination with respect to the vertical direction) is larger than the angle formed by the central axis of the first upper portion 611A with the vertical direction.

In addition, when viewed from the seat width direction (see FIG. 3B), the first lower portion 611B extends downward in a direction projecting forward of the seat. That is, the first lower portion 611B extends from the lower end of the first upper portion 611A toward the lower right and forward of the seat.

The first leg portion 612 is a portion that extends downward from the lower end of the first head support portion 611 (that is, the lower end of the first lower portion 611B). The first leg 612 extends substantially vertically. The first leg portion 612 includes the lower end of the first stay 61 . The central axis of the first leg 612 is linear.

(Second stay)
The second stay 62 has a second head support portion 621 and a second leg portion 622 .

The second head support portion 621 has a shape symmetrical to the first head support portion 611 of the first stay 61 . That is, the second head support portion 621 extends downward and forward of the seat from the upper end 62A of the second stay 62 when viewed in the seat width direction.

The second head support portion 621 includes a second upper portion 621A extending downward from the upper end 62A when viewed in the seat width direction, and a lower end of the second upper portion 621A extending downward and in front of the seat when viewed in the seat width direction. and an extending second lower portion 621B.

The second upper portion 621A extends downward to the left from the upper end 62A. The second lower portion 621B extends from the lower end of the second upper portion 621A toward the lower left and forward of the seat. The angle formed by the central axis of the second lower portion 621B with the vertical direction (that is, the inclination with respect to the vertical direction) is larger than the angle formed by the central axis of the second upper portion 621A with the vertical direction.

The second leg portion 622 is a portion that extends downward from the lower end of the second head support portion 621 (that is, the lower end of the second lower portion 621B). The second leg 622 extends substantially vertically. The second leg portion 622 includes the lower end of the second stay 62 . The central axis of the second leg 622 is linear.

(Relationship between first stay and second stay)
Due to the shape of the first head support portion 611 of the first stay 61 and the shape of the second head support portion 621 of the second stay 62, the center axis of the first head support portion 611 and the second stay The distance in the seat width direction from the center axis of the second head support portion 621 of 62 increases downward.

Further, the amount of change in the seat width direction distance along the vertical direction between the central axis of the first lower portion 611B of the first stay 61 and the central axis of the second lower portion 621B of the second stay 62 is is greater than the amount of change in the distance in the seat width direction along the vertical direction between the center axis of the first upper portion 611A of the second stay 62 and the center axis of the second upper portion 621A of the second stay 62 .

That is, when viewed from the front of the seat, the angle θ2 formed by the central axis of the first lower portion 611B and the central axis of the second lower portion 621B is the same as the central axis of the first upper portion 611A and the central axis of the second upper portion 621A. is larger than the angle θ1 formed by

<Connector>
The connection portion 63 is a portion that connects the upper end 61A of the first stay 61 and the upper end 62A of the second stay 62 in the seat width direction.

The connecting portion 63 has an entire center axis that is curved so as to be convex upward. In other words, the connecting portion 63 does not have a straight portion with a straight central axis. Also, the radius of curvature of the central axis of the connecting portion 63 is constant. That is, the central axis of the connecting portion 63 is curved to draw an arc with a constant radius.

Note that the central axis of the connecting portion 63 is substantially orthogonal to the seat front-rear direction and is not curved in the seat front-rear direction. The length of the arc drawn by the central axis of the connecting portion 63 is 1/4 or more of the circumference of the circle with the same diameter, preferably about 1/2 of the circumference of the circle with the same diameter.

[1-2. effect]
According to the embodiment detailed above, the following effects are obtained.
(1a) Since the entire central axis of the connecting portion 63 is curved, that is, the connecting portion 63 is configured only by the curved portion, the sinking of the head of the seated person into the connecting portion 63 is suppressed. be. As a result, it is possible to prevent the head of a seated person from slipping into the headrest 4 without providing a contact member such as a resin plate.

(1b) The distance in the seat width direction between the central axis of the first head support portion 611 and the central axis of the second head support portion 621 increases as it goes downward, so that the occupant in the event of a rear collision in the vehicle can be easily guided to the front of the seat. As a result, the effect of suppressing the head of the seated person from slipping into the headrest 4 can be promoted.

(1c) The amount of change in the distance in the seat width direction along the vertical direction between the central axis of the first lower portion 611B and the central axis of the second lower portion 621B is equal to the central axis of the first upper portion 611A and the second upper portion. The rigidity of the first stay 61 and the second stay 62 can be increased by making the change larger than the amount of change in the distance in the seat width direction along the vertical direction with respect to the central axis of 621A.

(1d) Since the radius of curvature of the central axis of the connecting portion 63 is constant, the size of the connecting portion 63 in the seat width direction can be minimized.

[2. Second Embodiment]
[2-1. composition]
A headrest frame 6A shown in FIGS. 4A and 4B is used in the vehicle seat 1 of FIG. 1 in place of the headrest frame 6 of FIG. The headrest frame 6A has the same configuration as the headrest frame 6 in FIG. 2 except that the shapes of the first head support portion 611 and the second head support portion 621 are different.

The central axis of the first head support portion 611 in the headrest frame 6A has a constant inclination with respect to the vertical direction when viewed from the front of the seat (see FIG. 4A). That is, the angle formed by the central axis of the first lower portion 611B of the first head support portion 611 and the vertical direction is the same as the angle formed by the central axis of the first upper portion 611A of the first head support portion 611 and the vertical direction. is. Therefore, the central axis of the first head support portion 611 as viewed from the front of the seat is straight and not curved.

The center axis of the second head support portion 621 in the headrest frame 6A also has a constant inclination with respect to the vertical direction when viewed from the front of the seat. That is, the angle formed by the central axis of the second lower portion 621B of the second head support portion 621 with the vertical direction is the same as the angle formed by the central axis of the second upper portion 621A of the second head support portion 621 with the vertical direction. is. Therefore, the central axis of the second head support portion 621 as viewed from the front of the seat is straight and not curved.

The shape of the first head support portion 611 and the second head support portion 621 when viewed from the seat width direction is the same as that of the headrest frame 6 in FIG. In other words, the first upper portion 611A extends downward to the right from the upper end 61A of the first stay 61 . The second upper portion 621A extends downward to the left from the upper end 62A of the second stay 62 .

Also, the first lower portion 611B extends from the lower end of the first upper portion 611A toward the lower right and forward of the seat. The second lower portion 621B extends from the lower end of the second upper portion 621A toward the lower left and forward of the seat.

[2-2. effect]
According to the embodiment detailed above, the following effects are obtained.
(2a) The central axis of the first head support portion 611 and the central axis of the second head support portion 621 of the headrest frame 6A are straight when viewed from the front of the seat, so that the headrest frame 6A can be formed smoothly. easier.

[3. Third Embodiment]
[3-1. composition]
A headrest frame 6B shown in FIGS. 5A and 5B is used in the vehicle seat 1 of FIG. 1 in place of the headrest frame 6 of FIG. The headrest frame 6B has the same configuration as the headrest frame 6 in FIG. 2 except that the shapes of the first head support portion 611 and the second head support portion 621 are different.

A first upper portion 611A of the first head support portion 611 and a second upper portion 621A of the second head support portion 621 in the headrest frame 6B are respectively located at the upper end 61A of the first stay 61 or the upper end 62A of the second stay 62. extends downward from the

Also, the central axis of the first upper portion 611A and the central axis of the second upper portion 621A are parallel. In other words, the distance in the seat width direction between the central axis of the first upper portion 611A and the central axis of the second upper portion 621A is constant along the vertical direction. That is, the central axis of the first upper portion 611A and the central axis of the second upper portion 621A are substantially parallel to the vertical direction.

On the other hand, the shapes of the first lower portion 611B of the first head support portion 611 and the second lower portion 621B of the second head support portion 621 in the headrest frame 6B are the same as those of the headrest frame 6 in FIG. That is, the first lower portion 611B and the second lower portion 621B extend downward and forward from the lower end of the first upper portion 611A or the second upper portion 621A when viewed in the seat width direction.

Specifically, the first lower portion 611B extends from the lower end of the first upper portion 611A toward the lower right and forward of the seat. The second lower portion 621B extends from the lower end of the second upper portion 621A toward the lower left and forward of the seat. Therefore, the distance in the seat width direction between the central axis of the first lower portion 611B and the central axis of the second lower portion 621B increases downward.

[3-2. effect]
According to the embodiment detailed above, the following effects are obtained.
(3a) Since the central axis of the first upper portion 611A and the central axis of the second upper portion 621A are parallel, the first stay 61 and the second stay 62 of the seated person's head at the time of a rear collision of the vehicle can be suppressed from entering between As a result, the effect of suppressing the head of the seated person from slipping into the headrest 4 can be enhanced.

[4. Other embodiments]
Although the embodiments of the present disclosure have been described above, it is needless to say that the present disclosure is not limited to the above embodiments and can take various forms.

(4a) In the vehicle seat of the above embodiment, the radius of curvature of the center axis of the connecting portion may not necessarily be constant. For example, there may be portions with different radii of curvature (that is, arcs with different radii) in the central axis of the connecting portion.

(4b) The vehicle seat of the above embodiment can be applied to a seat used in automobiles other than passenger cars, and to a seat used in vehicles other than automobiles, such as railroad cars, ships, and aircraft.

(4c) The function of one component in the above embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Also, part of the configuration of the above embodiment may be omitted. Also, at least a part of the configuration of the above embodiment may be added, replaced, etc. with respect to the configuration of the other above embodiment. It should be noted that all aspects included in the technical idea specified by the wording in the claims are embodiments of the present disclosure.

DESCRIPTION OF SYMBOLS 1... Vehicle seat, 2... Seat cushion, 3... Seat back, 4... Headrest,
5... back frame, 6, 6A, 6B... headrest frame, 61... first stay,
61A...Upper end 62...Second stay 62A...Upper end 63...Connecting portion
611... First head support part, 611A... First upper part, 611B... First lower part,
612... First leg part, 621... Second head support part, 621A... Second upper part,
621B... Second lower part, 622... Second leg.

Claims (5)

a seat cushion and a seat back;
a headrest;
a headrest frame that supports the headrest and is made of a tube or a bar;
with
The headrest frame is
a first stay and a second stay that are spaced apart from each other in the seat width direction;
a connecting portion connecting the upper end of the first stay and the upper end of the second stay in the seat width direction;
has
The first stay and the second stay, respectively,
a head support portion extending downward and forward of the seat from the upper end when viewed in the seat width direction;
legs extending downward from the lower end of the head support;
has
The vehicle seat, wherein the connecting portion has an entire central axis that is curved so as to protrude upward. A vehicle seat according to claim 1,
A vehicle seat, wherein a distance in a seat width direction between a central axis of the head supporting portion of the first stay and a central axis of the head supporting portion of the second stay increases downward. A vehicle seat according to claim 2,
The head support is
an upper portion extending downward from the upper end when viewed in the sheet width direction;
a lower portion extending downward and forward of the seat from the lower end of the upper portion when viewed in the seat width direction;
has
The amount of change in the seat width direction distance along the vertical direction between the central axis of the lower portion of the first stay and the central axis of the lower portion of the second stay is the center of the upper portion of the first stay. A vehicle seat that is larger than a change amount of a distance in a seat width direction along a vertical direction between an axis and a central axis of the upper portion of the second stay. A vehicle seat according to claim 1,
The head support is
an upper portion extending downward from the upper end;
a lower portion extending downward and forward of the seat from the lower end of the upper portion when viewed in the seat width direction;
has
a central axis of the upper portion of the first stay and a central axis of the upper portion of the second stay are parallel;
The vehicle seat, wherein a distance in the seat width direction between the central axis of the lower portion of the first stay and the central axis of the lower portion of the second stay increases downward. A vehicle seat according to any one of claims 1 to 4,
The vehicle seat, wherein the radius of curvature of the central axis of the connecting portion is constant.

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