JP6378412B2 - Seat back frame - Google Patents

Description

  The present invention relates to a seat back frame that forms a skeleton of a seat back of a vehicle seat, and more particularly to a seat back frame that can reduce a load load at the time of a vehicle collision.

  For vehicle seats, measures have been taken against a phenomenon in which a seated person moves backward and sinks into the seat (hereinafter referred to as a sinking phenomenon) at the time of a rear-end collision. Has been developed as a measure to reduce the load applied to the seated person in the sinking phenomenon. The techniques of Patent Document 1 and Patent Document 2 are both developed in consideration of the sinking amount (that is, the backward movement amount) of the chest of the seated person at the time of the sinking phenomenon.

  To explain in an easy-to-understand manner, as shown in FIG. 9, the sinking amount of the occupant's chest at the time of the subsidence phenomenon (indicated by a white thick arrow in FIG. 9) is different from that of other parts such as the neck and waist. It becomes large compared. Due to the difference in sinking amount, the posture of the seated person becomes a so-called stooped posture, and the seated person is subjected to a forward load (indicated by a solid thick arrow in FIG. 9) as a reaction force from the seat. It becomes like this. This forward load is a load load at the time of a vehicle collision, and is also simply referred to as a load hereinafter. FIG. 9 is a diagram showing a state of a general subduction phenomenon, and shows a state in which the amount of subsidence of the seated person's chest is increased.

  With respect to the above problems, in the vehicle seat disclosed in Patent Document 1, an energy absorbing cassette is disposed at a position corresponding to the chest of the seated person in the seat back, and an energy absorber is disposed at a predetermined position of the headrest. ing. And in patent document 1, the rebound characteristic (rebound speed, the rebound start time) of said energy absorption cassette and an energy absorber is adjusted at the time of a rebound by considering the characteristic of a seat back pad and a headrest. The speed difference between the rebound speed of the seated person's head and the rebound speed of the seated person's chest and the time difference between the rebound start time of the seated person's head and the rebound start time of the seated person's chest are reduced. According to such a configuration, it is possible to effectively reduce the load acting on the seated person at the time of the vehicle collision.

  Further, in the vehicle seat disclosed in Patent Document 2, a movable frame is provided on the seat back frame, and the lower part of the movable frame is arcuately rotated from the front to the upper rear side at the time of rearward collision of the vehicle. Configured to move. On the other hand, when the upper part of the movable frame moves forward, the headrest moves forward in conjunction with this. And in patent document 2, when a seated person's chest sinks into a seat back by a collision inertia force at the time of rear-end collision of a vehicle, the lower part of a movable frame will arc-rotate using that movement, and in the form interlocked with this, The headrest moves corresponding to the behavior of the seated person's head at the time of rear-end collision of the vehicle. According to such a configuration, it is possible to reduce the difference between the sinking amount of the seated person's chest during the sinking phenomenon and the sinking amount of the seated person's head, and as a result, the load acting on the seated person at the time of the vehicle collision Can be effectively reduced.

JP-A-10-119616 JP-A-2005-88618

  However, in Patent Documents 1 and 2, an energy absorbing cassette and energy absorber, or a movable frame and its accessory members are required to reduce the load on the seated person during the sinking phenomenon, so that the seat structure is complicated. Moreover, it leads to the increase in the number of parts. For this reason, the simplified structure is calculated | required as a measure which reduces the load at the time of a vehicle collision.

  Therefore, the present invention has been made in view of the above problems, and the object thereof is to simplify a load applied to a seated person at the time of a vehicle collision as a seat back frame forming a skeleton of a seat back of a vehicle seat. It is to provide a frame that can be reduced in configuration.

According to the seat back frame of the present invention, there is provided a seat back frame that forms a skeleton of a seat back that supports the back of a seated person of a vehicle seat, and the seated person can A movement amount reducing member that reduces the amount of backward movement of the seated person's back by holding the back of the seated person when moving backward is provided, and the movement amount reducing member faces the front of the vehicle seat. A front extending portion extending vertically and a vertically extending portion extending vertically, wherein the front extending portion is a first extending portion toward the front of the vehicle seat; And a second extending portion that extends along the width direction of the vehicle seat and that is continuous with the front end portion of the first extending portion. It is located in front of the front end of the lower end. Seat back frame that. Is solved.
The above configuration reduces the load applied to the seated person by pressing the seated person's chest when the vehicle collides to reduce the amount of subsidence (backward movement amount) of the part. That is, with the seat back frame configured as described above, it is possible to reduce the load applied to the seated person with a relatively simple structure by providing a member that presses the chest of the seated person when the vehicle collides.
In addition, with the above configuration, the movement amount reducing member is configured by a linear member such as a wire, so that the load applied to the seated person can be reduced with a simpler configuration.

  Further, in the above seat back frame, the headrest pillar provided for attaching the headrest to the seat back includes a pair of pillar support portions to be inserted at positions separated from each other in the width direction of the vehicle seat. In the width direction, the vertically extending portion may be disposed between the pillar support portions.

  In the seat back frame, the second extending portion may be positioned forward of a lower end of a headrest pillar provided for attaching a headrest to the seatback in the vehicle seat.

  In the above seat back frame, a headrest pillar provided for attaching a headrest to the seat back includes a pillar support portion to be inserted, and the front extension portion is in a width direction of the vehicle seat. A pair of the first extending portions are provided at positions separated from each other, the second extending portion is continuous with each of the pair of the first extending portions, and the pillar support portion is formed in the width direction. It is good also as arrange | positioning between a pair of said 1st extension parts.

  Further, in the seat back frame, the linear member is a connecting wire that connects between both ends in the width direction of the seat back, and the connecting wire has a headrest on the seat back in the vehicle seat. It is good also as being located in the lower part rather than the headrest pillar provided in order to attach, and the 2nd extension part being provided in the position which approaches the arrangement position of the headrest pillar in the width direction.

  Further, in the seat back frame, the linear member is a connecting wire that connects between both ends in the width direction of the seat back, and the front extension portion has a predetermined portion of the connecting wire for the vehicle. It is good also as forming by bending toward the front of a sheet | seat.

  The seat back frame may further include an upper frame that forms an upper end portion of the seat back frame and has a portion that extends in a height direction of the seat back, and the second extension portion includes the upper portion of the seat back frame. When viewed from the end in the width direction, the upper frame may be provided behind a virtual plane passing through the center in the front-rear direction of the portion extending in the height direction of the upper frame.

  The seat back frame may further include an upper frame that forms an upper end portion of the seat back frame and has an upright portion extending in a height direction of the seat back, and the linear shape in the width direction of the vehicle seat. The end of the member is bent at a right angle, and the portion from the bent portion to the end position in the width direction of the end of the linear member is joined to the upright portion. Also good.

  In the above seat back frame, the rear end of the linear member may be positioned behind the lower end of the headrest pillar provided for attaching the headrest to the seat back in the vehicle seat. .

  Further, in the above-described seat back frame, the seat back frame is disposed in a state inclined with respect to the vertical direction, and is provided for attaching a headrest to the seat back, and a pressure receiving member that supports the upper body of the seated person so as to move backward. The headrest pillar includes a pillar support portion to be inserted, and when the second extension portion is viewed from an end side in the width direction of the seat back, the pressure receiving member is positioned in the front-rear direction. It is good also as being provided in the back rather than the area | region which is located, and located in the front rather than the lower end of the said pillar support part.

  In the above seat back frame, the vehicle seat includes a seat cushion that supports a seated person's buttocks and a headrest that supports the head of the seated person, and a lower end portion of the seat back frame is the seat cushion. It is good also as being connected with the rear-end part of the seat cushion frame which comprises skeleton.

According to the seat back frame of the present invention, it is possible to reduce the load applied to the seated person with a relatively simple configuration of providing a member (movement amount reducing member) for pressing the chest of the seated person when the vehicle collides.
Further, according to the seat back frame of the present invention, since the movement amount reducing member is configured by a linear member such as a wire, it is possible to reduce the load applied to the seated person with a simpler configuration.
Further, according to the seat back frame of the present invention, since the connecting wire for connecting the pair of side frames is used as the movement amount reducing member, the increase in the number of parts accompanying the introduction of the movement amount reducing member and the large size of the seat back frame are achieved. Can be suppressed.
In addition, according to the seat back frame of the present invention, the rigidity of the front extending portion of the connecting wire constituting the movement amount reducing member is ensured, and a plurality of front extending portions are formed in the center portion in the width direction of the connecting wire. Thus, it is possible to effectively suppress the sinking amount of the seated person's chest when the vehicle collides.
Further, according to the seat back frame of the present invention, the seat back frame can be made compact by providing the front extension portion of the connecting wire by effectively using the space provided in the lower position of the headrest pillar. It becomes possible.
Further, according to the seat back frame of the present invention, since the movement amount reducing member presses the seat occupant only at the time of the vehicle collision and does not interfere with the seat occupant at other times, the seating feeling of the vehicle seat can be ensured. It becomes possible.
In addition, according to the seat back frame of the present invention, the head of the seated person can be efficiently supported by the headrest at the time of a vehicle collision, and the load applied to the seated person can be greatly reduced.
Further, according to the seat back frame of the present invention, when the seated person sits on the seat, it is first supported by the pressure receiving member and then pressed by the movement amount reducing member. It becomes possible to support in a stable state.
Further, according to the seat back frame of the present invention, when the seated person sits on the seat, the seat back frame is supported by the upper frame of the seat back frame and then pressed by the second extending portion. Can be supported in a more stable state.
Further, according to the seat back frame of the present invention, since the movement amount reducing member is arranged on the inner side in the width direction of the seat back frame, the movement amount reducing member can be arranged more compactly.

It is an external view of a vehicle seat. It is a side view of a seat frame. It is a perspective view showing a seat back frame concerning one embodiment of the present invention. It is an enlarged view of a connecting wire and its periphery. It is the figure which showed the AA cross section of FIG. It is a figure for showing the effect by the present invention. It is a side view of the seat back frame concerning a modification. It is a perspective view which shows the seat back frame which concerns on a modification. It is a figure which shows the mode of the general subduction phenomenon. It is a side view which shows a seat back frame provided with another kind of pressure receiving member. It is a rear view which shows a seat back frame provided with another kind of pressure receiving member.

Hereinafter, one embodiment (this embodiment) of the present invention will be described with reference to the drawings.
In the following description, the front-rear direction refers to the front-rear direction when viewed from a seated person seated on the vehicle seat, and the width direction refers to the width direction (lateral width direction) of the seat back of the vehicle seat. The height direction means the height direction of the seat back, strictly speaking, the vertical direction of the seat back when the seat back is viewed from the front. In addition, the shapes and arrangement positions of the members described below are the shapes and arrangement positions when the vehicle seat is in a seatable state, unless otherwise specified.

  Furthermore, the embodiments described below are merely examples for facilitating the understanding of the present invention, and do not limit the present invention. That is, the present invention can be changed and improved without departing from the gist thereof, and the present invention includes its equivalents.

  First, an overall configuration of a vehicle seat S including a seat back frame of the present invention will be outlined with reference to FIGS. 1 and 2 are views showing structural examples of the vehicle seat S and the seat frame SF, FIG. 1 is an external view of the vehicle seat S, and FIG. 2 is a side view of the seat frame SF. .

  As shown in FIG. 1, the vehicle seat S includes a seat back S1 that supports the back of the seated person, a seat cushion S2 that supports the buttocks of the seated person, and a headrest S3 that supports the head of the seated person. Each part is configured by placing pad materials 1a, 2a, and 3a on a frame as a skeleton and covering them with skin materials 1b, 2b, and 3b.

  Here, as shown in FIG. 2, in the seat frame SF, the seat back frame 1 forming the skeleton of the seat back S1 is formed at the lower end of the seat cushion frame 2 forming the skeleton of the seat cushion S2. It is connected. A reclining mechanism (not shown) is interposed between the seat back frame 1 and the seat cushion frame 2. As a result, the seat back frame 1 can rotate around the reclining shaft 11 with respect to the seat cushion frame 2, and the rearward tilt angle (backrest angle) of the seat back S1 with respect to the seat cushion S2 can be adjusted. The reclining shaft 11 passes through the side lower end portion of the seat back frame 1 and the side rear end portion of the seat cushion frame 2 and protrudes somewhat outward in the width direction.

  In addition, a cylindrical pillar support portion 19 a is attached to the center of the upper end of the seat back frame 1. The headrest S3 is attached to the seat back S1 by inserting the headrest pillar 19 extending from the lower end of the headrest S3 into the pillar support portion 19a.

  Next, a configuration example of the seat back frame 1 will be described with reference to FIGS. FIG. 3 is a perspective view showing the seat back frame 1 according to the present embodiment, in which the width direction and the height direction are indicated by arrows.

  As shown in FIG. 3, the seat back frame 1 is a substantially rectangular frame made of a metal member, and includes a pair of side frames 15 provided at both ends in the width direction and an upper frame provided at the upper end in the height direction. 16 and a lower frame erection part 18 provided at the lower end part are provided as main constituent parts. In the present embodiment, the side frame 15, the upper frame 16, and the lower frame erection portion 18 constitute the seat back frame 1 by being combined and integrated from a state where they are separated from each other. It may be formed as a result of being molded, that is, integrally formed with a resin material.

  The pair of side frames 15 correspond to a pair of side frames, and are spaced apart in the left-right direction to define the width of the seat back S1, and both are arranged to extend in the up-down direction. As shown in FIG. 3, each side frame 15 is formed by bending a side plate 15a, a front edge portion 15b formed by bending the front end portion of the side plate 15a into an arc shape, and bending the rear end portion into an L shape. And an edge portion 15c. As shown in FIG. 2, in the state where the posture of the vehicle seat S is in a seatable posture, the upper end portion of each side frame 15 is located somewhat behind the lower end portion. Moreover, the lower end part of each side frame is formed wider than the upper end part in the front-rear direction.

  The upper frame 16 connects the upper ends of the pair of side frames 15 and is formed in an inverted U shape in a front view. The upper frame 16 according to the present embodiment is configured by bending a steel pipe, and both ends thereof are attached to the upper ends of the side frames 15. Further, two pillar support portions 19a described above are attached to the central portion of the upper frame 16 with a space therebetween.

As described above, the upper frame 16 bends so as to bridge the upper ends of the upright portions 16A that are spaced apart in the left-right direction so as to extend from the side frames 15 and the upper end portions of the pair of left and right upright portions 16A. And a pillar mounting portion 16B that extends. Here, the upright portion 16 </ b> A corresponds to a portion that the upper frame 16 includes at both ends in the width direction and extends in the height direction.
The upper frame 16 is disposed such that the rising portion 16A overlaps with the upper end portion of the side frame 15, and is welded to the side frame 15 at the overlapping portion.

  Further, as shown in FIG. 3, a connecting wire 21 as a linear member is installed between the rising portions 16 </ b> A of the upper frame 16. This connecting wire 21 is attached in compliance with laws and regulations. Specifically, the connecting wire 21 is provided so that the corner (lower end) of the headrest pillar 19 inserted into the pillar support portion 19a does not hit the seated person. The headrest pillar 19 is disposed somewhat below the lower end of the headrest pillar 19.

  Further, the connecting wire 21 has a relatively large wire diameter, and a plurality of bent portions are bent at midway positions in order to ensure rigidity. Specifically, the connecting wire 21 is bent substantially perpendicularly to the horizontal portion 21a and a portion (hereinafter referred to as a horizontal portion) 21a extending along the width direction of the seat back S1. And a portion (hereinafter referred to as a U-shaped portion) 21b folded back.

  Further, the connecting wire 21 is welded to the upright portion 16A of the upper frame 16 at the end thereof. From the viewpoint of securing the rigidity of the welded part and the area of the part, the end of the connecting wire 21 is connected. Is bent at a right angle, and the portion from the bent position to the end of the wire is welded to the upright portion 16A. Further, as shown in FIG. 3, the welded portion of the connecting wire 21 in the upper frame 16 reaches a portion where the upright portion 16 </ b> A of the upper frame 16 and the side frame 15 overlap. As described above, the connecting wire 21 is welded to the portion where the upright portion 16 </ b> A and the side frame 15 overlap with each other. As a result, the attachment rigidity of the connecting wire 21 is relatively high.

The lower frame erection part 18 is a part that is bridged between the lower ends of the side frames 15 in order to connect the pair of side frames 15.
Furthermore, the seat back frame 1 according to the present embodiment includes a pressure receiving member 20 illustrated in FIG. 3 in addition to the above-described configuration. The pressure receiving member 20 supports the upper body of the seated person so as to be able to move backward. Specifically, the pressure receiving member 20 is a substantially rectangular resin plate that supports the pad material 1a of the seat back S1 from the rear. In the present embodiment, the pressure receiving member 20 made of a resin plate will be described as an example. However, as shown in FIGS. 10 and 11, the pressure receiving member 40 made of a spring-like member curved in a waveform (so-called S spring). It is good also as using. 10 and 11 are views showing a seat back frame 1 including another type of pressure receiving member 40, FIG. 10 is a side view of the seat back frame 1, and FIG. FIG.

  Further, the pressure receiving member 20 is disposed in a space surrounded by the pair of side frames 15, the upper frame 16, and the lower frame installation portion 18. Specifically, the pressure receiving member 20 is supported so as to be suspended from each of the pair of side frames 15. More specifically, the center portion of the fixing wire 20a is locked to the upper side and the lower side of the surface (back surface) located on the opposite side of the pressure receiving member 20 from the side in contact with the pad material 1a. The end of the wire 20a is hooked to a predetermined part of each side frame 15. Accordingly, the pressure receiving member 20 is disposed in the seat back frame 1 in a state where the pressure receiving member 20 is suspended by the fixing wire 20 a stretched between the pair of side frames 15.

  In the present embodiment, the pressure receiving member 20 is disposed in the seat back frame 1 in a state where the pressure receiving member 20 is inclined with respect to the vertical direction so that the upper end portion is located somewhat on the rear end side with respect to the lower end portion.

  By the way, when a seat occupant of the vehicle seat S moves backward and sinks into the seat due to a rear-end collision of the vehicle, that is, when the sinking phenomenon occurs, the seat of the occupant's chest sinks in the general vehicle seat S. The amount of intrusion increases compared to other parts such as the neck and waist. As a result, the load applied to the seated person becomes relatively large, and the forward tilt degree of the seating head due to the load is also increased.

On the other hand, in the vehicle seat S according to the present embodiment, the structure of the seat back frame 1 is capable of reducing the load applied to the seated person at the time of the rear collision of the vehicle.
Hereinafter, the configuration adopted for the purpose of reducing the load applied to the seat occupant at the time of rearward collision of the vehicle in the seat back frame 1 will be described in detail with reference to FIGS. 4 and 5 are explanatory views of a configuration for reducing a load applied to a seated person at the time of a rear-end collision of the vehicle. FIG. 4 is an enlarged view of the connecting wire 21 and its surroundings, and FIG. AA cross sections are shown respectively. FIG. 6 is a diagram for illustrating the effect of the present invention, and is a diagram illustrating a situation of a seated person of the vehicle seat S according to the present embodiment at the time of rearward collision of the vehicle, and corresponds to FIG. FIG.

  The seat back frame 1 according to the present embodiment holds down a portion where the thoracic vertebra is located on the back of the seated person (hereinafter referred to as the thoracic vertebrae equivalent part) when the seated person moves toward the rear of the vehicle seat S due to a vehicle collision. A movement amount reducing member for reducing the sinking amount of the portion is provided. In this way, when the seated person's chest is pressed at the time of rearward collision of the vehicle to reduce the sinking amount of the part, the load applied to the seated person can be reduced.

  To explain in an easy-to-understand manner, in the general vehicle seat S, as described above, the sinking amount of the chest is larger than the sinking amount of other parts during the sinking phenomenon. As a result, as shown in FIG. 9, the seated person's posture becomes a so-called stooped posture, and the seated person's head tilts forward significantly.

  On the other hand, in this embodiment, since the amount of depression of the chest is reduced by providing a member that presses the thoracic vertebrae equivalent part of the back of the seated person at the time of rearward collision of the vehicle, the seated person is as shown in FIG. It is possible to maintain a posture in which the upper body is stretched. That is, a member (movement amount reduction member) that presses the thoracic vertebrae corresponding portion on the back of the seated person absorbs input (impact energy) to the seated person at the time of the rear impact of the vehicle. As a result, the forward tilt of the seated person's head is suppressed, and the load applied to the seated person can be reduced.

  And in this embodiment, the above-mentioned connection wire 21 is utilized as a member which pushes a seating person's back thoracic vertebrae equivalent part at the time of a vehicle rear collision. In other words, in the present embodiment, the connecting wire 21 functions as the movement amount reducing member described above. Thereby, in this embodiment, it is possible to reduce the load applied to the seated person with a relatively simple configuration, and at the same time, it is not necessary to prepare a separate member in order to reduce the load applied to the seated person. An increase in the number of parts and an increase in the size of the seat back frame 1 are suppressed.

Hereinafter, the configuration of the connecting wire 21 will be described again.
As described above, the connecting wire 21 according to the present embodiment is bent a plurality of times at the midway position thereof, and is orthogonal to the horizontal portion 21a and the horizontal portion 21a extending along the width direction of the seat back S1. And a U-shaped portion 21b which is bent and folded back into a substantially U-shape. In particular, in the present embodiment, the U-shaped portion 21b is formed at a plurality of positions, specifically, at two positions, symmetrically with respect to the center in the width direction of the seat back S1. In addition, as shown in FIG. 4, the position of each U-shaped part 21b is substantially the same position as the pillar support part 19a in the width direction of the seat back S1.

  On the other hand, as shown in FIGS. 4 and 5, the U-shaped portion 21 b is bent so that the lower end portion extends forward. That is, the lower end portion of the U-shaped portion 21 b of the connecting wire 21 corresponds to a front extending portion that extends toward the front of the vehicle seat S. As described above, in the present embodiment, the portion corresponding to the front extension portion of the connecting wire 21 is formed by bending the lower end portion of the U-shaped portion 21b toward the front of the vehicle seat S.

Here, the shape of the U-shaped part 21b will be described in detail. The left and right ends of the U-shaped part 21b are connected to the horizontal part 21a in the downward direction (strictly, the direction inclined slightly forward with respect to the vertical direction). A hanging part 21c is formed so as to hang down. Moreover, the lower part of each drooping part 21c forms the bending part 21d as a 1st extension part by bending toward the front. In the present embodiment, as shown in FIG. 5, the bent portion 21d is bent in a slightly inclined state so as to be lowered toward the front.
Furthermore, a front portion 21e is formed between the front end portions of the bent portion 21d as a second extending portion that is continuous with the front end portion of the bent portion 21d and extends along the width direction of the seat back S1. Yes. That is, the bent part 21d and the front part 21e of the U-shaped part 21b constitute the above-described forward extension part.

  And the pad material 1a of seat back S1 is arrange | positioned in the front position of the connection wire 21 containing the U-shaped part 21b. Thereby, at the time of a rear collision of the vehicle, the front portion 21e of the U-shaped portion 21b of the connecting wire 21 presses the thoracic vertebrae corresponding portion on the back of the seated person via the pad material 1a. In other words, in the height direction of the seat back S1, the front portion 21e of the U-shaped portion 21b is disposed at the same position as the corresponding portion of the thoracic vertebra on the back of the seated person. As described above, in this embodiment, the portion of the connecting wire 21 that is bent in the U shape presses the back of the seated person at the time of the rear collision of the vehicle. It is possible to properly hold the thoracic vertebrae equivalent part.

  Further, in the present embodiment, as shown in FIG. 5, the front portion 21 e of the U-shaped portion 21 b is located behind the front end of the side frame 15 and is located at the front end than the rear end of the side frame 15. Thus, the connecting wire 21 is arranged. Thereby, the front part 21e of the U-shaped part 21b does not press the seated person's back at the normal time, and the seat corresponding to the thoracic vertebrae corresponding to the back of the seated person is pressed at the time of the rear collision of the vehicle. That is, the front portion 21e of the U-shaped portion 21b presses the back of the seated person only at the time of rearward collision of the vehicle, and interference with the seated person is suppressed at other times. As a result, even when a part of the connecting wire 21 is bent forward, the seating feeling of the vehicle seat S can be secured and held.

  In the present embodiment, as shown in FIG. 4, two U-shaped portions 21b having the above-described structure are formed in the central portion of the connecting wire 21 in the width direction of the seat back S1. In other words, since there are a plurality of locations in the width direction of the seat back S1 that press the corresponding portion of the thoracic vertebra on the back of the seated person at the time of rearward collision of the vehicle, It is possible to more effectively suppress the amount of subsidence. In addition, about the location which presses a seated person's back thoracic vertebrae equivalent part at the time of a vehicle rear-end collision, it is not limited to two places, It is good also as there being three or more places, or good also as being only one place. .

  Further, the connecting wire 21 is positioned below the headrest pillar 19 of the headrest S3 in the vehicle seat S. Further, the U-shaped portion 21b of the connecting wire 21 is provided in a state of reaching the position where the headrest pillar 19 is disposed in the width direction of the seat back S1. Here, in the seat back frame 1, there is a space below the headrest pillar 19. In this embodiment, the U-shaped portion 21 b of the connecting wire 21 is provided using this space. As a result, the seat back frame 1 according to the present embodiment has a sufficiently compact shape.

  In the present embodiment, the connecting wire 21 is provided behind the region where the pressure receiving member 20 is located in the front-rear direction when viewed from the end in the width direction. With such a positional relationship, the seated person is first supported by the pressure receiving member 20 and then pressed by the U-shaped portion 21b of the connecting wire 21 when seated on the seat. As a result, the connecting wire 21 is supported in a more stable state.

  The U-shaped portion 21b of the connecting wire 21 is more than a virtual plane passing through the center in the front-rear direction of the upright portion 16A of the upper frame 16 of the seatback frame 1 when viewed from the end in the width direction. It is good also as providing behind (refer FIG. 10). With such a positional relationship, the seated person is pressed by the U-shaped portion 21b after being supported by the upper frame 16 when seated on the seat. Thereby, the connecting wire 21 is supported in a more stable state.

  Further, in the present embodiment, the connecting wire 21 is disposed inside the upright portion 16A of the upper frame 16 in the width direction, and is attached to the portion 16A. In other words, in the present embodiment, the connecting wire 21 is arranged on the inner side in the width direction of the seat back frame 1 and is arranged more compactly.

  In the present embodiment, as described above, the end of the connecting wire 21 is welded to the rising portion 16A of the upper frame 16, more specifically, to the portion where the rising portion 16A and the side frame 15 overlap. . Thereby, since the attachment rigidity of the connecting wire 21 becomes relatively high, it is possible to suitably hold the state of pressing the thoracic vertebrae corresponding portion on the back of the seated person at the time of rearward collision of the vehicle.

  As described above, in this embodiment, the U-shaped portion 21b of the connecting wire 21 presses the thoracic vertebrae corresponding to the back of the seat occupant at the time of rearward collision of the vehicle. The amount of backward movement (sinking amount) is reduced. On the other hand, the member and shape for pressing the thoracic vertebrae equivalent part of the seated person's back at the time of rearward collision of the vehicle are not particularly limited, and other than using the existing parts as the movement amount reducing member, the movement amount reducing member It is also possible to introduce a dedicated product as a separate product. However, if it is possible to cope by changing the shape of the connecting wire 21 as in this embodiment, it is possible to minimize the increase in cost and weight because it is not necessary to introduce additional parts.

  Note that the effect of reducing the load applied to the seated person is more effectively exhibited by providing the seat back frame 61 with the waist movement suppression member 50 shown in FIG. FIG. 7 is a side view of a seatback frame 61 according to a modification. Hereinafter, the configuration of the seat back frame 61 according to the modification will be described.

  The seat back frame 61 according to the modified example has the same configuration as the seat back frame 1 illustrated in FIGS. 2 and 3 described above, except that the waist movement suppression member 50 is provided. The waist movement restraining member 50 suppresses the back movement of the waist by pressing the waist of the seated person when the seated person moves toward the rear of the vehicle seat S due to a rear collision of the vehicle.

  In the seat back frame 61 according to the modification, the waist movement suppressing member 50 is disposed in the lower frame erection part 18. More specifically, the waist movement suppression member 50 is formed by bending a metal plate having a predetermined thickness, and its strength and hardness are designed to withstand the load during a rear collision. ing. And the waist | hip | lumbar part movement suppression member 50 is attached to the front side surface of the lower frame installation part 18, as shown in FIG. FIG. 8 is a perspective view of a seat back frame 61 according to a modification.

  Moreover, the waist | hip | lumbar part movement suppression member 50 is formed in the substantially rectangular tube shape, and a part of side surface is notched. The details of the waist movement suppression member 50 will be described. The waist movement suppression member 50 includes an upper wall 51, a lower wall 52, a front wall 53, and a rear wall 54 as shown in FIG. The upper wall 51 is a substantially rectangular flat plate portion disposed substantially horizontally with respect to the vehicle floor, and extends from the rear end so that the rear wall 54 hangs downward. Further, a front wall 53 extends from the front end of the upper wall 51 so as to hang downward. Furthermore, a lower wall 52 arranged so as to be substantially parallel to the upper wall 51 extends from the lower end of the front wall 53 so as to bend backward. Further, the free end of the lower wall 52 is curved toward the front and is formed in a bowl shape.

  The rear wall 54 of the waist movement restraining member 50 configured as described above is welded to the front side surface of the lower frame bridging portion 18, and the waist movement restraining member 50 is located in front of the seat back frame 1, that is, on the seating side of the occupant. It arrange | positions in the state protruded toward. On the other hand, as shown in FIG. 7, the reclining shaft 11 is disposed so as to penetrate the inside of the waist movement suppression member 50 and is disposed at a position where it does not contact the waist movement suppression member 50. For this reason, when the reclining mechanism operates and the reclining shaft 11 rotates, it is possible to suppress the waist movement suppressing member 50 and the reclining mechanism from interfering with each other.

  And by providing the waist | hip | lumbar part movement suppression member 50, it becomes possible to exhibit more effectively the effect of reducing the load concerning a seated person. To explain in an easy-to-understand manner, at the time of rearward collision of the vehicle, the back movement of the seated person's waist is restrained by the waist movement restraining member 50, while the body and head of the seated person turn backward with the waist as a fulcrum. . At this time, the thoracic vertebrae equivalent part on the back of the seated person is pushed and the rearward movement of the chest is restricted, so that the head of the seated person moves backward. As a result, the head of the seated person can be efficiently supported by the headrest S3, and thus the effect of reducing the load applied to the seated person can be exhibited significantly.

DESCRIPTION OF SYMBOLS 1 Seat back frame 2 Seat cushion frame 1a, 2a, 3a Pad material 1b, 2b, 3b Skin material 11 Reclining shaft 15 Side frame 15a Side plate, 15b Front edge part, 15c Rear edge part 16 Upper frame 16A Upright part, 16B Pillar attachment Part 18 Lower frame installation part 19 Headrest pillar 19a Pillar support part 20 Pressure receiving member 20a Fixing wire 21 Connecting wire 21a Horizontal part, 21b U-shaped part 21c Hanging part (vertical extension part), 21d Bending part (first extension) Part)
21e front part (second extension part)
40 Pressure-Receiving Member 50 Lumbar Movement Suppressing Member 51 Upper Wall, 52 Lower Wall, 53 Front Wall, 54 Rear Wall 61 Seat Back Frame S according to Modification Example Vehicle Seat S 1 Seat Back, S 2 Seat Cushion, S 3 Headrest SF Seat Frame

Claims (11)

A seat back frame that forms a skeleton of a seat back that supports the back of a seated person of a vehicle seat,
When the seat occupant moves toward the rear of the vehicle seat due to a vehicle collision, a movement amount reducing member that reduces the amount of rear movement of the seat occupant by pressing the back of the seat occupant is provided.
The movement amount reducing member is a linear member having a front extending portion extending toward the front of the vehicle seat and a vertically extending portion extending vertically.
The front extension part is connected to a first extension part toward the front of the vehicle seat and a front end part of the first extension part, and extends along the width direction of the vehicle seat. With an extension part,
The seatback frame, wherein the second extension part is located in front of a front end of a lower end part of the vertical extension part. Headrest pillars provided for attaching a headrest to the seat back include a pair of pillar support portions to be inserted at positions separated from each other in the width direction of the vehicle seat,
The seat back frame according to claim 1, wherein in the width direction, the upper and lower extension portions are disposed between the pillar support portions.   3. The seat according to claim 1, wherein the second extending portion is positioned in front of a lower end of a headrest pillar provided for attaching a headrest to the seatback in the vehicle seat. Back frame. The headrest pillar provided for attaching the headrest to the seat back includes a pillar support portion to be inserted,
The front extension part includes a pair of the first extension parts at positions separated from each other in the width direction of the vehicle seat,
The second extension part is continuous with each of the pair of first extension parts,
The seat back frame according to any one of claims 1 to 3, wherein the pillar support portion is disposed between the pair of first extension portions in the width direction. The linear member is a connecting wire that connects between both ends in the width direction of the seat back,
The connecting wire is located below the headrest pillar provided for attaching the headrest to the seatback in the vehicle seat,
The seat back frame according to any one of claims 1 to 4, wherein the second extending portion is provided at a position that reaches an arrangement position of the headrest pillar in the width direction. The linear member is a connecting wire that connects between both ends in the width direction of the seat back,
The seat back according to any one of claims 1 to 5, wherein the front extension portion is formed by bending a predetermined portion of the connecting wire toward the front of the vehicle seat. flame. An upper frame comprising an upper end portion of the seat back frame and having a portion extending in a height direction of the seat back;
The second extending portion is behind the virtual plane passing through the center in the front-rear direction of the portion of the upper frame extending in the height direction when viewed from the end in the width direction of the seat back. The seat back frame according to claim 1, wherein the seat back frame is provided. An upper frame having an upper end that forms an upper end of the seat back frame and extends in a height direction of the seat back;
The end of the linear member in the width direction of the vehicle seat is bent at a right angle,
The part from the location bent in the right angle to the end position in the width direction among the end parts of the linear member is joined to the upright part. The seat back frame as described in.   The rear end of the linear member is located behind the lower end of a headrest pillar provided for attaching a headrest to the seatback in the vehicle seat. The seat back frame according to one item. A pressure-receiving member that is disposed in a state inclined with respect to the vertical direction and supports the upper body of the seated person so as to be movable backward;
A headrest pillar provided for attaching the headrest to the seat back includes a pillar support portion to be inserted;
The second extending portion is provided behind a region where the pressure receiving member is positioned in the front-rear direction when viewed from the end in the width direction of the seat back, and the pillar support portion The seat back frame according to any one of claims 1 to 9, wherein the seat back frame is located in front of a lower end of the seat. The vehicle seat has a seat cushion that supports a seated person's buttocks, and a headrest that supports the head of the seated person,
The seat back frame according to any one of claims 1 to 10, wherein a lower end portion of the seat back frame is connected to a rear end portion of a seat cushion frame that forms a skeleton of the seat cushion.

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