JP5456354B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat, and more particularly to a vehicle seat that can reduce an occupant's neck injury value at the time of a rear collision.

  In general, in the case of a so-called rear collision, such as when the rear part of a vehicle such as an automobile is bumped into the rear or makes a large collision when traveling backward, the head of the seated occupant suddenly tilts backward due to inertial force, There is a risk that the part will be impacted.

  Therefore, conventionally, a vehicle seat such as an automobile is protected from the impact caused by a rear collision, and the head of the occupant is rearwardly positioned above the seat back in order to protect the occupant's head and neck and reduce the cervical obstacle value. A headrest is provided.

  However, the provision of a headrest not only reduces the impact on the body, but also reduces the occupant's cervical disorder value sufficiently if the gap between the head and the headrest of the occupant is not quickly reduced during a rear-end collision. In some cases, it cannot be reduced.

  In order to solve such a problem, a technique has been proposed in which the headrest is moved forward by a moving load to the rear of the occupant at the time of a rear collision, and the cervical obstacle value is reduced by supporting the occupant's head. (For example, refer to Patent Document 1).

  In addition, a lock mechanism is provided so as to be involved in the movement of the movable frame so that when the movable frame moves in a direction from the normal position toward the head of the seat occupant, the lock is released to allow the movement. The technology described above is known (for example, see Patent Document 2).

JP 2005-028956 A JP 2004-203252 A

  The technique disclosed in Patent Document 1 is to increase the rearward movement of the upper body by reducing the spring coefficient of the portion where the back portion of the seat back (referred to as “chest” in Patent Document 1) abuts. By reducing the relative movement of the back part and increasing the damping coefficient using low-elasticity cushioning material, the upper body rebound is suppressed and the relative speed between the head and the back part is reduced. We are aiming to reduce the head failure value.

  In addition, the technique disclosed in Patent Document 2 allows the movement of the movable frame in the direction from the normal position toward the head of the seat occupant, and the movement of the movable frame in the reverse direction is as follows. This is a technique that prevents the headrest from being loaded with a certain load.

The technique of this patent document 2 is to move the movable frame using the upper and lower link mechanisms and move the headrest, the lock mechanism is connected to the upper link side, the link mechanism is enlarged, At the same time, the lock mechanism is a mechanism through a plurality of link mechanisms.
As described above, the techniques disclosed in Patent Document 1 and Patent Document 2 are linked with the headrest, and there is an inconvenience that the apparatus becomes large as a whole and it is difficult to reduce the weight.

  The object of the present invention is to operate reliably with an impact load of a certain level or more, to be small and light, and to ensure that the body sinks behind the vehicle with a certain level of impact load or more, so that the occupant's neck injury The object is to provide a vehicle seat capable of effectively reducing the value.

According to the vehicle seat of the present invention, the subject is provided with a seat back frame including at least side portions located on both sides and an upper portion disposed above, and disposed above the seat back frame. guiding the headrest that, the pressure receiving member to independently movable with the headrest, a first connection member and a second connecting member connecting the pressure receiving member to the side portion of the seat back frame, a front Stories second connecting member A guide groove, a lock groove for locking the second connecting member, an upper link member that connects the first connecting member and the second connecting member and is movable with respect to a side portion of the seat back frame; A lower link member that is pivotally connected to a lower end portion of the upper link member at an upper end portion and is pivotally connected to a side portion of the seat back frame at a lower end portion; Comprising biasing means for biasing the lower end of the side link member in a vehicle front, wherein the one end of the first coupling member, an upper end portion of the lower link member and the lower end of the upper link member times rotatably in journaled, said second coupling member fixed to said upper end of the upper link member, the pressure receiving member that adds a certain or more impact load, the first connection member and the second connecting member the load transmitted to said second coupling member out of the locking groove, while moving the vehicle rearward along the front Symbol guide groove, wherein the side portion of the one end of the first coupling member wherein the lower link member The first connecting member is moved rearward of the vehicle by rotating backward with respect to the vehicle as a support shaft .

By thus joining the impact load exceeding a predetermined pressure receiving member, the load transmitted to the first connecting member and the second connecting member, out of the second connecting member Gallo click groove, along the plan groove portion Transportation Since the first connecting member is moved rearward , and the one end of the first connecting member is rotated rearward of the vehicle with the rotating shaft relative to the side portion of the lower link member as a support shaft, the first connecting member is moved rearward of the vehicle . Since it operates reliably with a certain impact load or more, and the pressure receiving member moves independently of the headrest, it is not necessary to provide a mechanism linked to the headrest, and it is possible to reduce the size and weight.
In addition, since the pressure receiving member is movable independently of the headrest, it is possible to ensure the sinking in a state where the occupant holds the seating posture at the time of the rear collision, and the occupant's head can come into contact with the headrest. For this reason, it becomes possible to support the passenger | crew's head for moving a headrest ahead, and to reduce a passenger | crew's neck trouble value effectively.

More specifically, the guide groove is formed from the rear end of the locking groove and extending rearwardly obliquely upward. As described above, since the lock groove portion and the guide groove portion have a predetermined angle, the movement of the second connecting member from the lock groove portion to the guide groove portion is prevented by a normal seating load, and the guide is guided by an impact load of a certain level or more. It is possible to move to the groove.

  According to the vehicle seat of the present invention, when the impact load of a certain level or more is applied to the pressure receiving member, the blocking of the connecting member is released and the movable member can be moved. Since no mechanism linked with the headrest is provided, the size and weight can be reduced. And the vehicle seat which can ensure the sinking of the body to the back of a vehicle with the impact load more than fixed and can reduce a passenger | crew's neck disorder value effectively can be provided.

It is a schematic perspective view of a vehicle seat. It is a schematic perspective view of a seat back frame before an impact load of a certain level or more is applied. It is a schematic perspective view of the seat back frame after an impact load of a certain level or more is applied. FIG. 3 is a partially enlarged explanatory view of FIG. 2. FIG. 4 is a partially enlarged explanatory view of FIG. 3. It is a partial explanatory view explaining the axial support of an engaging member. It is a schematic perspective view similar to FIG. 2 which shows other embodiment. It is explanatory drawing of the side frame of FIG. It is explanatory drawing of the side frame after the impact load more than fixed is added. It is explanatory drawing of a lock groove part and a guide groove part. It is explanatory drawing of a side frame when a load is applied to the 1st connection member. It is explanatory drawing of the lock groove part at the time of FIG. 11, a guide groove part, and a 1st connection member. It is explanatory drawing of a side frame when a load is applied to a 2nd connection member. It is explanatory drawing of the lock groove part at the time of FIG. 13, a guide groove part, and a 2nd connection member. It is a schematic perspective view similar to FIG. 2 which shows other embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. It should be noted that members, arrangements, and the like described below do not limit the present invention, and it goes without saying that various modifications can be made in accordance with the spirit of the present invention. In this specification, a vehicle means a vehicle for traveling on which a seat can be mounted, such as a vehicle for traveling on the ground having wheels such as an automobile or a railroad, an aircraft or a ship moving on the ground, and the like. Further, the normal seating load includes a seating impact that occurs when sitting, a load during acceleration caused by sudden start of the vehicle, and the like. The impact load above a certain level is a large load caused by a rear collision, and refers to a large rear-end collision by a vehicle from the rear side, a large collision during reverse travel, etc., including those in the load range similar to normal seating load Absent.

  1 to 6 show an embodiment according to the present invention, FIG. 1 is a schematic perspective view of a vehicle seat, FIG. 2 is a schematic perspective view of a seat back frame before an impact load of a certain level or more is applied, and FIG. FIG. 4 is a partially enlarged explanatory view of FIG. 2, FIG. 5 is a partially enlarged explanatory view of FIG. 3, and FIG. 6 is a shaft support of the engaging member. It is a partial explanatory view to explain.

  As shown in FIG. 1, the vehicle seat S according to the present embodiment includes a seat back S1 (back portion), a seating portion S2, and a headrest S3. The seat back S1 (back portion) is shown in FIG. A cushion pad 1a is placed on such a seat back frame F and covered with a skin material 1b to support the back of the occupant from the rear.

  The seating portion S2 of the present embodiment is formed by placing a cushion pad 2a on a seating frame (not shown) and further covering with a skin material 2b. An unillustrated seating frame is supported by a leg portion, and an inner rail (not shown) is attached to the leg portion, and is assembled in a slide type that can be adjusted in the front-rear position with an outer rail installed on the vehicle body floor. Yes. The rear end portion of the seating frame is connected to the seat back frame F via a reclining mechanism.

In the present embodiment, as shown in FIG. 2, the seat back frame F is a substantially rectangular frame and includes a side portion 10, an upper portion 20, and a lower portion 30. In addition, a pressure receiving member 40 and an engaging member 50 are disposed on the seat back frame F.
The side portion 10 includes two side frames 15 that are spaced apart in the left-right direction and extend in the up-down direction in order to form a seat back width. And the upper part 20 which connects the upper end part side of the side frame 15 is extended from the side part 10 upwards in the U-shape.

  A headrest pillar support portion 22 is disposed in the upper portion 20 of the seat back frame F, and a headrest pillar 21 (see FIG. 1) that supports the headrest S3 is guide-locked (not shown) to the headrest pillar support portion 22. And the headrest S3 is attached. The headrest S <b> 3 is formed by covering the core material (not shown) of the head with the pad material 3 a and covering with the skin material 3 b, and is supported by the headrest pillar 21.

  Further, the lower portion 30 of the seat back frame F has an intermediate portion 17 that connects both sides of the side frame 15 on the lower end side of the side frame 15. The seat back frame F of the present embodiment is formed by separate members of the side frame 15 constituting the side portion 10, the upper portion 20, and the intermediate portion 17 constituting the lower portion 30. It can also be formed of an integral plate frame or the like.

  The side frame 15 of the present embodiment is an extending member that constitutes a side surface of the seat back frame F, and is disposed to face each other with a predetermined interval in the left-right direction. 2 and 4, a flat side plate 15a, a front edge portion 15b bent inward in an L shape from the front end portion (located on the vehicle front side) of the side plate 15a, and a rear end portion And a rear edge portion 15c bent inward from the portion into an L shape.

  The pressure receiving member 40 of the present embodiment is a member in which a plate-like resin is formed in a substantially rectangular shape, and is movable independently of the headrest S3 without being interlocked with the headrest S3. As shown in FIG. 2, the pressure receiving member 40 supports the cushion pad 1 a from the rear in an inner region in the seat back frame F (between the side frames 15 on both sides) that does not interfere with the side frame 15 of the seat back frame F. Acts as a hold.

  The pressure receiving member 40 of this embodiment is connected to the side frame 15 on the side portion side by a first connecting member 42 and a second connecting member 44. That is, both sides of the pressure receiving member 40 are on the upper side and the lower side, respectively, on the upper side and the lower side between the side frames 15 by the first connecting member 42 and the second connecting member 44 (formed in the present embodiment). It is constructed, and the pressure receiving member 40 supports the back surface of the cushion pad 1a. In the present embodiment, a connecting member that engages with a groove 52 described later is a second connecting member.

  In the present embodiment, the first connecting member 42 is connected to the pressure receiving member 40 by the support portion 42a on the back side of the pressure receiving member 40, and the end portion 42b rotates to the side portion 10 (side frame 15) of the seat back frame F. It is pivotally supported.

  The second connecting member 44 is connected to the pressure receiving member 40 by the support portion 44a on the back side of the pressure receiving member 40, and the end portions 44b are disposed on the side portions 10 (side frames 15) on both sides of the seat back frame F. However, in this embodiment, it engages with the groove part 52 (the lock groove part 52a and the guide groove part 52b) of the engaging member 50 mentioned later.

The side plate 15 a of the side frame 15 described above has a shaft support portion 11 that supports the first connecting member 42, a base 12 that supports the engaging member 50 engaged with the second connecting member 44, A first stopper 18 and a second stopper 19 are formed.
The shaft support portion 11 that supports the first connecting member 42 is formed at a position inside the upper side of the side plate 15a, and supports the first connecting member 42 described above. The shaft support portion 11 only has to pivotally support the first connecting member 42 so that a known technique can be used. A hole may be formed in the side plate 15a of the side frame 15 instead of the shaft support 11, and the end 42b of the first connecting member 42 may be rotatably inserted into the hole to prevent it from coming off. .

  As shown in FIG. 6, the pedestal 12 supports an engaging member 50 to be described later, has a raised shape at the center, and both sides are welded to the lower side plate 15 a. A shaft hole 12c is formed in the pedestal 12, and the shaft portion 12a is inserted into the shaft hole 12c and the shaft hole 50c of the engagement member 50, and the engagement member 50 is pivoted by the shaft portion 12a. Support. Reference numerals 12d and 12e are members that hold the shaft portion 12a.

As shown in FIG. 4, the front edge portion 15b is formed with a locking projection 15f, and one end side of a tension coil spring as the biasing means 14 is locked to the locking projection 15f. As shown in FIG. 4, the other end side of the means 14 is locked to the locking portion 13. In addition, the latching | locking part 13 is not limited to what is illustrated, What is necessary is just to be able to latch the urging means 14.
The first stopper 18 and the second stopper 19 of the present embodiment regulate the movement of the engaging member 50 described later, and the engaging member 50 directly contacts the front edge portion 15b side and the rear edge portion 15c side. It regulates not to touch. The first stopper 18 and the second stopper 19 are not limited to those shown in the drawings, and may be any one that restricts the movement of the engaging member 50.

The engaging member 50 according to the present embodiment is composed of a plate, is engaged with the second connecting member 44, and is urged in a fixed direction. The shaft hole 50c and the urging means 14 are locked. Part 13 and groove 52 (lock groove 52a, guide groove 52b).
As described above, the shaft hole 50c of the engaging member 50 is rotatably supported by the shaft hole 12c of the base 12 and the shaft portion 12a. Moreover, the latching | locking part 13 latches the one end side of the tension coil spring as the biasing means 14, and the other end side is latched by the latching protrusion 15f mentioned above.

  As the urging means 14 of the present embodiment, a tension coil spring obtained by coiling a spring wire is used, and hooks for locking are respectively formed in semicircular shapes at both ends of the tension coil spring. By this urging means 14, the engaging member 50 is always tensed so that it does not rattle.

Further, as shown in FIG. 4, the engaging member 50 is formed with a lock groove 52a and a guide groove 52b, and the lock groove 52a and the guide groove 52b are continuously formed at a predetermined angle. Is formed. The angle formed by the lock groove 52a and the guide groove 52b is preferably set within a range of 65 ± 10 degrees in order to move the second connecting member 44.
In the present embodiment, an example in which the lock groove 52a is formed at a position higher than the guide groove 52b is shown. The end 44b of the second connecting member 44 is engaged with the groove 52 (the lock groove 52a and the guide groove 52b).

  In the present embodiment, the lock groove 52a and the guide groove 52b are both substantially concave arcs, and in the state before the engagement member 50 is movable, the end of the lock groove 52a on the vehicle front side is more than the other end. An arc is formed so as to be positioned above. Thus, by forming the lock groove 52a and the guide groove 52b in an arc shape, the second connecting member 44 is connected to the side frame 15 of the first connecting member 42 by an impact load of a certain level or more, as will be described later. When moving using the position as a support shaft, it can move smoothly along the lock groove 52a and the guide groove 52b.

As described above, in the present embodiment, components such as the base 12, the engaging member 50, the urging means 14, the locking portion 13, the first stopper 18, and the second stopper 19 are attached to the side frame 15. It is configured so as not to hinder passengers from sinking.
In addition, as mentioned above, the number of parts and members is small, the shape is simple, and the same member can be used for the side frames on both sides.

  During a normal seating load (about 100 N), the end 44b of the second connecting member 44 engages with the lock groove 52a, the second connecting member 44 is locked by the lock groove 52a, and the engaging member 50 is It is configured not to move. Further, the engaging member 50 is configured not to be unlocked by its own weight by the above-described urging means 14 (tensile coil spring).

  Then, as shown in FIG. 3 and FIG. 5, the second connecting member 44 engaged with the lock groove 52a is locked by the impact groove of a certain level or more, for example, a load at the time of rear collision. It moves to the guide groove part 52b from 52a, and is guided along this guide groove part 52b.

  That is, when an impact load of a certain level or more is applied to the pressure receiving member 40, the second connecting member 44 comes off the lock groove 52a, and the occupant tries to move backward due to inertia. Due to this load, the pressure receiving member 40 and the second connecting member locked to the pressure receiving member 40 are guided along the guide groove 52b of the engaging member 50. At this time, the connecting position of the first connecting member 42 is changed. It can move as a spindle.

  As described above, the first connecting member 42 can freely rotate, rotates about the shaft support portion 11 of the side frame 15 (side portion 10), and sinks while the occupant's body maintains the sitting posture. And the head of the occupant can come into contact with the headrest, effectively reducing the occupant's neck injury value.

  7 to 14 show other embodiments. FIG. 7 is a schematic perspective view similar to FIG. 2, FIG. 8 is an explanatory view of the side frame of FIG. 7, and FIG. 10 is an explanatory view of the side frame after being added, FIG. 10 is an explanatory view of the lock groove portion and the guide groove portion, FIG. 11 is an explanatory view of the side frame when a load is applied to the first connecting member, and FIG. FIG. 13 is an explanatory view of the side groove when a load is applied to the second connecting member, FIG. 14 is an explanatory view of the lock groove portion, the guide groove portion, and the first connecting member, and FIG. It is explanatory drawing of a connection member.

  In this embodiment, an example in which the lock groove 52a is formed at a position below the guide groove 52b is shown. Further, in the present embodiment, an example in which the lock groove portion 52a and the guide groove portion 52b are directly formed in the side frame 15 without using the engaging member 50 as in the above embodiment is shown. In the embodiment, the second connecting member is disposed on the lower side and is engaged with the lock groove 52a and the guide groove 52b. In the present embodiment, the second connecting member is connected to the upper groove. It is assumed that the upper and lower positions of the first connecting member and the second connecting member of the embodiment are reversed. In the present embodiment, the same members and the same materials as those in the previous embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, as shown in FIG. 10, a groove portion 52 (lock groove portion 52 a and guide groove portion 52 b) is formed in a region connected to the second connecting member 44 of the side frame 15, and this groove portion 52 is formed. The locking groove 52a and the guide groove 52b are formed continuously with a predetermined angle, and a flat groove portion 52c is formed from the locking groove 52a to the guide groove 52b. In this embodiment, the lock groove 52a is formed at a position below the guide groove 52b. The lock groove portion 52a and the flat portion 52c are formed substantially horizontally, and the angle formed by the flat portion 52c and the guide groove portion 52b is preferably set in a range of 125 ± 10 degrees.

In the present embodiment, the pressure receiving member 40, the link mechanism 60 (link member 61, link member 62), the urging means 70, the first connection member 42, the second connection member 44, and the rotation shaft 80. And. The first connecting member 42 is connected to the pressure receiving member 40 by the support portion 42a on the back side of the pressure receiving member 40, and the second connecting member 44 is connected to the pressure receiving member 40 by the support portion 44a on the back side of the pressure receiving member 40. ing.
The pressure receiving member 40 of this embodiment is connected to the side frame via the first connecting member 42 and the second connecting member 44. A pin 81 serving as a rotation shaft 80 is fixed to the side frame 15 slightly inward from the side plate 15 a by caulking, welding, or the like, and the lower end of the link member 61 is movable to the pin 81 by a push nut 82. Installed as possible.

  Further, as shown in FIG. 7, the biasing means 70 is disposed between the first connecting member 42 and the side frame 15, and the link member 61 and the link member 62 are moved forward of the vehicle via the first connecting member 42. Energized in the direction. Specifically, the urging means 70 is formed of a tension coil spring, and as shown in FIGS. 7 and 8, one end is hooked on the locking projection 15f of the side frame 15, and the other end side is the first connecting member. It is comprised so that it may be latched by the latching hole 42c formed in 42. FIG. The urging means 70 is not limited to the example shown in the figure, and may urge the first connecting member 42 in the vehicle forward direction and may be disposed between the link member 61 and the side frame 15. . The link member 62 is an engaging member that is engaged with the second connecting member 44 in the present embodiment.

  And the upper end part of this link member 61 and the lower end part of the link member 62 are attached with a push nut (not shown) so that it may be pivotally supported by the 1st connection member 42. Thus, the link member 61 and the link member 62 are connected so as to be movable with the first connecting member 42 as an axis.

Moreover, the 2nd connection member 44 is penetrated and attached to the upper end of the link member 62, and the edge part 44b of the 2nd connection member 44 is the groove part 52 (locking | locking) formed in the both-sides side frame 15, as shown in FIG. The groove 52a and the guide groove 52b) are disposed so as to extend to both outer sides of the side frame 15. That is, the second connecting member 44 is fixed to the link member 62, but is not fixed to the side frame 15, and the end portion 44 b is loosely fitted in the groove portion 52.
As described above, in the present embodiment, the pressure receiving member 40, the first connecting member 42, the second connecting member 44, and the link mechanism 60 (link member 61, link member 62) are attached to the side frame 15 and interlocked. Configured to do. For this reason, when an impact load of a certain level or more is generated, each component is accommodated in the side frame 15 so as not to prevent the passenger from sinking.
In addition, as described above, the number of parts and members is small and the shape is simple, and the same member can be used for both side frames.

  During a normal seating load (about 100 N), the end 44b of the second connecting member 44 engages with the lock groove 52a, and the second connecting member 44 is locked by the lock groove 52a. The link mechanism 60 is configured not to be unlocked by its own weight by the above-described urging means 70 (tensile coil spring).

  When the impact load exceeds a certain level, for example, at the time of a rear collision, as shown by the arrow in FIG. 8, the vehicle is pushed forward to cause the seated person to be pushed into the seat back S1. The movement at this time becomes a force for pressing the seat back S1, and the pressure receiving member 40 in the seat back S1 receives a load and is transmitted to the first connecting member 42 and the second connecting member 44.

  When an impact load of a certain level or more is transmitted to the first connecting member 42 and the second connecting member 44, as shown in FIG. 9, the link member 61 rotates about the rotating shaft 80, and the link member 62 is the second connecting member. As shown in FIG. 10, the end 44b of the second connecting member 44 is disengaged from the lock groove 52a, moves to the point A, and further along the guide groove 52b, the point B that is the end point of the guide groove 52b. Move up. As a result, the pressure receiving member 40 moves rearward to make it easier for the occupant to sink into the seat back S1. In this way, in the state where the occupant maintains the sitting posture of the occupant from the initial stage of the collision until the neck contacts the headrest S3, the sinking can be secured, and the occupant's head can come into contact with the headrest S3. For this reason, it becomes possible to support the passenger | crew's head for moving headrest S3 ahead, and to reduce a passenger | crew's neck disorder value effectively.

  Further, as shown in FIG. 11, when the load in the direction of the arrow in the drawing is a normal seating load and only the first connecting member 42 is loaded, the first connection of the link member 61 and the link member 62 is performed. The part pivotally supported by the member 42 moves rearward. At this time, since a force for pushing up the link member 62 is applied, a force in the direction of the arrow (upward) is applied to the end 44b of the second connecting member 44 as shown in FIG. The end 44b of the second connecting member 44 is hooked on 52c, and the second connecting member 44 does not move. Therefore, the pressure receiving member 40 does not move rearward, and the occupant does not sink, and the posture of the occupant remains supported.

  Further, as shown in FIG. 13, when the load in the direction of the arrow is a normal seating load and the load is applied only to the second connecting member 44, the groove 52 of the side frame 15 is placed at the seating position of the occupant. Since the shape of is formed upward, it moves backward within the range of the flat portion 52c, but with the cushion material 1a and the skin material 1b attached, as shown in FIG. Although it moves, since it is difficult to move the second connecting member 44 upward (moving in the direction of the white arrow), the pressure receiving member 40 does not move backward. Therefore, the occupant does not sink, and the occupant's posture remains supported.

Even when the seat back S1 is in the fully flat state, even when the second connecting member 44 moves, the second connecting member 44 returns to the original state when the seat back S1 is returned to the seating position from the full flat state.
Even when the pressure receiving member 40, the first connecting member 42, the second connecting member 44, and the link mechanism 60 (link member 61, link member 62) are operated in conjunction with an impact load of a certain level or more, Since the above elements are not damaged, they can be used again.

FIG. 15 shows still another embodiment, and is a schematic perspective view similar to FIG.
In the present embodiment, the pressure receiving member 40 is connected to the first connecting member 42 and is connected to the lower pressure receiving member 40a disposed on the lower side in the seat back frame F, and the second connecting member 44, and the lower pressure receiving member. And an upper pressure receiving member 40b disposed above 40a.

  The first connecting member 42 has a shape bent up and down on the back side of the lower pressure receiving member 40a, and holds the lower pressure receiving member 40a. Similarly, the second connecting member 44 has a shape bent up and down on the back side of the upper pressure receiving member 40b, and holds the upper pressure receiving member 40b. The first connecting member 42 is positioned forward (occupant side) with respect to the second connecting member 44, and the lower pressure receiving member 40a is disposed forward (occupant side) with respect to the upper pressure receiving member 40b. Yes.

  In this way, when the pressure receiving member 40 is separated into upper and lower parts and configured by the lower pressure receiving member 40a and the upper pressure receiving member 40b, in the normal seating state, the load on the rear of the occupant is received only by the lower pressure receiving member 40a. The load is transmitted only to the first connecting member 42. Therefore, the second connecting member 44 operates, that is, the second connecting member 44 can be prevented from moving along the groove portion 52, and a stable seating feeling is obtained, which is more preferable.

  When an impact load of a certain level or more occurs, both the lower pressure receiving member 40a and the upper pressure receiving member 40b receive the load of the occupant, and the load is transmitted to the first connecting member 42 and the second connecting member 44, as described above. Similarly to the embodiment shown by 7, the second connecting member 44 moves along the groove 52. As a result, the lower pressure receiving member 40a and the upper pressure receiving member 40b move rearward so that the occupant can sink into the seat back S1, and the occupant's head can be brought closer to the headrest S3. In this way, the headrest S3 supports the occupant's head and can effectively reduce the occupant's neck injury value.

According to the vehicle seat of the present invention, the compact structure ensures that the pressure receiving member is actuated by applying an impact load of a certain level or more and ensures that the occupant's body sinks behind the vehicle, thereby ensuring that the occupant's neck The head failure value can be effectively reduced.
Further, according to the present invention, when the occupant sinks into the seat back, it does not interlock with the forward movement of the headrest, so there is less loss of occupant's rearward movement energy at the time of a rear collision, and the occupant is more deeply seated Can sink into the cushion.

  In each of the above-described embodiments, the seat back of the front seat of the automobile has been described as a specific example. However, the present invention is not limited thereto, and the same configuration can be applied to the seat back of the rear seat. .

1a, 2a, 3a Cushion pad (pad material)
1b, 2b, 3b Skin material 10 Side part 11 Axle support part 12 Base 12a Shaft part 12c Shaft hole 12d, 12e Holding member 13 Locking part 14 Energizing means 15 Side frame 15a Side plate 15b Front edge part 15c Rear edge part 15f Locking Protrusion
17 Intermediate portion 18 First stopper 19 Second stopper 20 Upper portion 21 Headrest pillar 22 Headrest pillar support portion 30 Lower portion 40 Pressure receiving member 40a Lower pressure receiving member 40b Upper pressure receiving member 42 First connecting member 42a, 44a Support portions 42b, 44b End portion 42c Latch hole 44 Second connecting member 50 Engaging member 50c Shaft hole 52 Groove portion 52a Lock groove portion 52b Guide groove portion 52c Flat portion 60 Link mechanism 61, 62 Link member 70 Energizing means 80 Rotating shaft 81 Pin 82 Push nut S vehicle seat S1 seat back S2 seating part S3 headrest F seat back frame

Claims (5)

A seat back frame including at least side portions located on both sides and an upper portion disposed above;
A headrest disposed above the seat back frame;
A pressure receiving member movable independently of the headrest;
A first connecting member and a second connecting member for connecting the pressure receiving member to the side portion side of the seat back frame ;
A guide groove for guiding the pre-Symbol second connecting member,
A locking groove for locking the second connecting member;
An upper link member that connects the first connection member and the second connection member and is movable relative to a side portion of the seat back frame;
A lower link member that is pivotally connected to a lower end portion of the upper link member at an upper end portion and is pivotally connected to a side portion of the seat back frame at a lower end portion;
Biasing means for biasing the lower end portion of the upper link member forward of the vehicle ,
One end portion of the first connecting member is pivotally supported to an upper end of the lower link member and the lower end of the upper link member pivotally,
The second connecting member is fixed to an upper end portion of the upper link member,
By more impact load constant is applied to the pressure receiving member, the first connection member and the load transmitted to the second connecting member, said second coupling member out of the locking groove, the vehicle along the front Symbol guiding groove The first connecting member is moved rearward, and the one end portion of the first connecting member is rotated rearward of the vehicle about a rotating shaft with respect to the side portion of the lower link member. A vehicle seat characterized by being movable . The one end of the biasing means is locked to the first connecting member, and biases the upper link member and the lower link member forward of the vehicle via the first connecting member. The vehicle seat according to 1. The vehicle according to claim 1 or 2, wherein the other end of the urging means is locked to the front end of the side portion at a position below the upper end of the lower link member and above the lower end. Sheet. The vehicle seat according to any one of claims 1 to 3, wherein the lower link member is shorter than the upper link member. The vehicle seat according to any one of claims 1 to 4, wherein the guide groove portion extends obliquely rearward and upward from a rear end portion of the lock groove portion.

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