JP2013184507A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat which is capable of backwardly moving an elastic support member for elastically supporting an upper body of an occupant, and controlling any increase in the number of components.SOLUTION: In a rear-end collision of one's own vehicle, when an upper body B of an occupant is pressed against a seat back S2 by the inertia force, an upper elastic support member 25 and a lower elastic support member 26 for elastically supporting the upper body B of the occupant are expanded while their right ends are guided by a slidable guide part 22D of a guide connection part 22A and allowed to slide backwardly. Thus, the upper body B of the join sinks in the seat back S2, and a head of the occupant is brought close to a head rest. As a result, the impact forces applied to the head and the neck of the occupant are mitigated.

Description

  The present invention relates to a vehicle seat for vehicles and the like, and more particularly, to a vehicle seat that can sufficiently absorb an impact force generated at the time of a vehicle rear surface collision.

  When a rear vehicle collides with another vehicle or the rear part of the host vehicle colliding with the rear part of the host vehicle or the rear part of the host vehicle colliding with another vehicle or a structure, a large impact force is generated on the host vehicle, and the seat of the host vehicle is generated. A large impact force is applied to the occupant seated in the.

  At that time, if the upper body of the occupant seated on the seat can be submerged deeply into the seat back as in the vehicle seat back device described in Patent Document 1, for example, the impact force applied to the occupant is reduced. Can be well protected.

  Here, the vehicle seat back device described in Patent Document 1 has two elastic support members, an upper support member and a lower support member, arranged in the vehicle width direction, and an end portion of the upper support member is a seat back. Is supported by the seat back via a displacement mechanism displaceable rearward. On the other hand, the end portion of the lower support member is supported by a trigger mechanism that can operate the displacement mechanism only when a rear load of a predetermined value or more is applied.

Japanese Patent Laid-Open No. 2002-2342

  By the way, in the vehicle seat back structure described in Patent Document 1, a displacement mechanism that supports the end portion of the upper support member so as to be rearwardly displaceable with respect to the seat back, or a rear load of a predetermined value or more is applied to the lower support member. A trigger mechanism that activates the displacement mechanism only when it is added is necessary, and there is a problem that the structure is complicated and the number of parts increases.

  The present invention has been made in view of the technical background as described above, and an elastic support member that elastically supports the upper body of an occupant can be moved rearward with a simple structure, and an increase in the number of components is also suppressed. It is an object to provide a vehicle seat that can be used. In addition, when the vehicle collides with the rear of the vehicle, the upper body of the occupant can be sunk into the seat back to absorb the impact, and at that time, the upper body of the occupant can be stably received without giving the passenger an uncomfortable feeling. It is an issue to provide. It is another object of the present invention to make it possible to easily and smoothly perform the backward movement of the elastic support member and the autonomous return operation to the front in a stable state.

  A vehicle seat of the present invention that solves the above-described problems is a vehicle seat that includes at least a seat cushion and a seat back, and the seat back includes a seat back frame that constitutes a skeleton, and left and right sides of the seat back frame. By connecting the ends, an elastic support member that elastically supports the upper body of the occupant seated on the seat cushion, and at least one end of the left and right of the elastic support member can be guided rearward with respect to the seat back frame. And a guide for connecting the end of the elastic support member to the rear. The guide guide is provided with a sliding guide for sliding the end of the elastic support member backward.

  In the vehicle seat according to the present invention, when the occupant's upper body is pressed against the seat back by an inertial force at the time of the rear collision of the vehicle, at least one end portions of the left and right elastic support members that elastically support the occupant's upper body are guided. It is guided by the sliding guide part of the connecting part and slides backward. As a result, the upper body of the occupant sinks deeply into the seat back, and the impact on the occupant is absorbed.

  In the vehicle seat according to the present invention, there is a difference in rigidity between the left and right portions of the seat back frame to which the left and right end portions of the elastic support member are connected, and when the induction connecting portion is provided on one side thereof, the induction connecting portion on the high rigidity side It is preferable that the upper body of the occupant sinking into the seat back is stably received by the high rigidity side of the seat back frame. Further, in this case, the seat back frame can be tilted rearward on the side having a low rigidity, so that the uncomfortable feeling that the occupant's upper body is twisted at the time of the rear collision of the vehicle is suppressed.

  In the vehicle seat of the present invention, it is preferable that the return portion for sliding the end portion of the elastic support member forward is provided because the return operation of the elastic support member forward becomes easy and smooth. Further, in the vehicle seat of the present invention, the sliding guide portion of the induction coupling portion is arranged from the rear portion so that the end portion of the elastic support member slides forward with respect to the seat back frame by the contraction restoring force of the elastic support member. It is preferable to incline in the contraction direction of the elastic support member toward the front part.

  Here, the induction coupling portion can be formed by cutting and raising the component of the seat back frame. It is preferable to provide a reinforcing portion for reinforcing the back side of the sliding guide portion in the induction connecting portion. Further, the elastic support member can be constituted by a linear spring.

  The sliding guide portion of the guide connecting portion slides the end of the elastic support member backward until the backward moving load acting on the elastic support member reaches a predetermined value from the upper body of the occupant seated on the seat cushion. It is preferable to provide a sliding restricting portion for restricting the above. In this case, the occupant's upper body does not inadvertently sink into the seat back until the backward movement load acting on the elastic support member reaches a predetermined value, and the occupant's seating posture is stabilized.

  Preferably, the sliding guide portion of the induction coupling portion is provided with a position restricting portion that stops the end portion of the elastic support member that slides backward at a predetermined end position. In this case, when the rearward movement load acting on the elastic support member from the upper body of the occupant falls below a predetermined value, the end of the elastic support member easily slides forward due to the contraction restoring force of the elastic support member. .

  According to the first aspect of the present invention, since the at least one end portion of the elastic support member is connected to the seat back frame so as to be able to be guided rearward, the upper body of the occupant can be When pressed against the seat back, the upper body of the occupant can be sunk into the seat back to absorb the impact. In particular, since the means for sliding backward at least one end of the left and right of the elastic support member is constituted by the sliding guide portion of the induction connecting portion, the structure is simple and an increase in the number of parts can be suppressed.

  According to the second aspect of the present invention, since the induction coupling portion is provided on the rigid side of the seat back frame, the upper body of the occupant is seated when the upper body of the occupant sinks into the seat back at the rear collision of the vehicle. The back frame can be stably received on the high rigidity side. Further, since the induction coupling portion is not provided on the low rigidity side of the seat back frame, the weight can be reduced. Further, since the seat back frame can be tilted backward on the side having a low rigidity, it is possible to suppress a sense of incongruity that the occupant's upper body is twisted at the time of a rear collision of the vehicle.

  According to the invention described in claim 3, since the return portion for sliding the end portion of the elastic support member forward is provided, the elastic support member can be easily and smoothly returned to the front. be able to.

  According to the invention described in claim 4, since the sliding guide portion of the induction coupling portion is inclined in the contraction direction of the elastic support member from the rear portion toward the front portion, When the elastic support member that has been pushed and expanded returns from the extended state to the contracted state by the contraction restoring force after the rear surface collision of the vehicle, at least one end of the elastic support member autonomously follows the sliding guide portion of the induction connecting portion. Can be moved back to the front.

  According to the fifth aspect of the present invention, since the induction connecting portion is formed by cutting and forming the structural member of the seat back frame, the structure can be simplified and the increase in the number of parts can be further suppressed. .

  According to the sixth aspect of the invention, since the reinforcing portion that reinforces the back side of the sliding guide portion is provided in the induction connecting portion, at least one end portion of the elastic support member at the left and right ends along the sliding guide portion. When sliding, it is possible to ensure stable sliding without hindering the sliding.

  According to the seventh aspect of the invention, since the elastic support member is composed of a linear spring, it is easy to attach at least one end portion of the left and right sides of the elastic support member.

  According to the eighth aspect of the present invention, the end of the elastic support member is slid backward until the rearward moving load acting on the elastic support member reaches a predetermined value from the upper body of the occupant seated on the seat cushion. Since the sliding restricting portion to be regulated is provided in the sliding guide portion, the upper body of the occupant can be sunk into the seat back only at the time of rear collision of the vehicle in which the backward movement load exceeds a predetermined value.

  According to the ninth aspect of the invention, since the slide guide portion is provided with the position restricting portion that stops the end portion of the elastic support member that slides backward at the predetermined end position, the end of the elastic support member The sliding when the part slides toward the front start position can be started smoothly.

1 is a perspective view of a vehicle seat showing an embodiment of a vehicle seat according to the present invention. FIG. 2 is a front perspective view of a seat cushion frame and a seat back frame built in the vehicle seat shown in FIG. 1. FIG. 3 is a rear perspective view of the seat cushion frame and the seat back frame shown in FIG. 2. FIG. 3 is an enlarged perspective view of the vicinity of the induction coupling portion illustrated in FIG. 2. FIG. 3 is an enlarged perspective view near a support bracket shown in FIG. 2. FIG. 3 is a horizontal sectional view of a seat back showing a tensioned state of the upper elastic support member shown in FIG. 2. It is a horizontal sectional view of a seat back corresponding to Drawing 6 for explaining an operation in a no-load state of a vehicular seat of one embodiment. It is a horizontal sectional view of a seat back corresponding to Drawing 6 for explaining an operation in a load state at the time of normal operation of a vehicular seat of one embodiment. It is a horizontal sectional view of a seat back corresponding to Drawing 6 for explaining an operation in a heavy load state at the time of rear surface collision of a vehicular seat of one embodiment. It is a graph of the displacement-load curve of an upper elastic support member and a lower elastic support member shown in comparison with a conventional example. It is a horizontal sectional view showing the 1st modification of an induction connection part. It is a horizontal sectional view showing the 2nd modification of an induction connection part. It is a horizontal sectional view showing the 3rd modification of an induction connection part.

  Hereinafter, an embodiment of a vehicle seat according to the present invention will be described with reference to the accompanying drawings. For example, as shown in FIG. 1, the vehicle seat according to the embodiment is configured as a vehicle seat S disposed in a driver's seat of an automobile. The vehicle seat S includes a seat cushion S1, a seat back S2, and a headrest S3 in which a pad material made of a cushion material such as urethane foam is covered with an outer skin such as synthetic leather or fabric. In the following description, the front-rear and left-right directions are directions viewed from the occupant assuming a state in which the occupant is seated on the seat cushion S1.

  The seat cushion S1 and the seat back S2 incorporate a seat cushion frame 10 and a seat back frame 20 as shown in FIGS. 2 and 3 as a skeleton. Although not shown, the headrest S3 also incorporates a headrest frame that constitutes the skeleton thereof.

  The seat cushion frame 10 is mainly composed of a bread frame 11 press-molded into a substantially rectangular dish shape. The pan frame 11 can be adjusted in position in the front-rear direction via a slide rail 30 on the floor of the driver's seat.

  On the other hand, the seat back frame 20 includes a pipe frame 21 framed in a vertically long rectangle, a right side frame 22 welded to the right side portion of the pipe frame 21, and a left side welded to the lower portion of the left side portion of the pipe frame 21. A side frame 23 and a support bracket 24 that is disposed immediately above the left side frame 23 and is welded to the left side portion of the pipe frame 21 are provided.

  The right side frame 22 is press-molded into a shape projecting forward from the right side portion of the pipe frame 21. The right side frame 22 has a rear edge portion welded along the right side portion of the pipe frame 21, and a lower portion around the rear surface of the pipe frame 21 to be firmly welded, whereby the rigidity of the right side portion of the pipe frame 21 is increased. Is increasing.

  The lower end portion of the right side frame 22 is connected to a right connection bracket 40 fixed to the right rear portion of the seat cushion frame 10 via a reclining unit RU so as to be tiltable back and forth.

  The left side frame 23 is welded so as to hold the outer surface of the lower end portion on the left side of the pipe frame 21. The lower end portion of the left side frame 23 is connected to the left connecting bracket 50 fixed to the left rear portion of the seat cushion frame 10 so as to be tiltable back and forth.

  The support bracket 24 also serves as a support member for an armrest (not shown), and includes support pins 24A for supporting the armrest so that the armrest can be tilted up and down.

  Between the right side frame 22 and the support bracket 24, an upper elastic support member 25 and a lower elastic support member 26 as an example of an elastic support member made of a linear spring bent in a continuous waveform are stretched. ing. When a pressure receiving plate (not shown) that receives the upper body of the occupant seated on the seat cushion S1 is provided, the pressure receiving plate is attached to the upper elastic support member 25 and the lower elastic support member 26 so that the front and rear direction of the seat Elastically supported. The elastic support member that supports such a pressure receiving plate can be constituted by a wire spring.

  Here, the right side frame 22 having high rigidity includes guide connection portions 22A and 22A for connecting the right end portions of the upper elastic support member 25 and the lower elastic support member 26 so as to be capable of being guided rearward, respectively. Is formed by cutting and raising the plate material.

  Since the upper and lower guide connecting portions 22A and 22A are configured in the same manner, only the upper guide connecting portion 22A for connecting the right end portion of the upper elastic support member 25 so as to be able to be guided rearward will be described, and the lower elastic support member 26 is described. The description of the lower guide connecting portion 22A that connects the right end portion of the rear end of the right end portion so as to be capable of being guided rearward is omitted.

  As shown in an enlarged view in FIG. 4, the induction coupling portion 22 </ b> A is obliquely cut and raised in a tongue shape so that the front end portion protrudes inward from the left side surface of the right side frame 22. A hook portion 22B that locks the right end portion of the upper elastic support member 25 is bent and formed in an L shape in the outer direction at the front end portion of the induction coupling portion 22A. Further, a reinforcing portion 22C is formed to bulge inward in the rear end portion of the induction coupling portion 22A. The reinforcing part 22C reinforces the back side of the rear part of a sliding guide part 22D described later. Since the rear end portion of the sliding guide portion 22D has an escape portion (inner convex portion) 22H for easily separating the right end portion of the upper elastic support member 25 forward, the right end portion of the upper elastic support member 25 is provided. Since the resistance at the rear end of the sliding guide portion 22D is suppressed, it becomes easier to return to the front.

  The outer surface of the induction coupling portion 22A is set as a sliding guide portion 22D for sliding the right end portion of the upper elastic support member 25 rearward. The sliding guide portion 22D is inclined obliquely in the contraction direction of the upper elastic support member 25 from the rear portion toward the front portion. That is, the sliding guide portion 22D is inclined obliquely in the inner direction away from the left side surface of the right side frame 22, and the front side is located on the inner side from the rear side.

  And the sliding control part (front sliding control part) 22E which controls the sliding to the front is set in the part bent outside the front part of sliding guide part 22D. The sliding restricting portion 22E is a portion for restricting the right end portion of the upper elastic support member 25 from sliding backward until the backward moving load acting on the upper elastic support member 25 reaches a predetermined value.

  In addition, a position restricting portion 22F that functions as a stopper that stops the right end portion of the upper elastic support member 25 sliding rearward at a predetermined end position is provided at the rear end portion of the sliding guide portion 22D. The position restricting portion 22F is made of a resin material or a rubber material having a silencing effect, for example, in the shape of a rod having a triangular cross section, and is fixed to the rear end portion of the sliding guide portion 22D by bonding or the like.

  Here, an upwardly projecting escape portion (an angled shape) 22G is formed at the upper part of the cut-and-raised window of the right side frame 22 from which the guide connecting portion 22A has been cut and raised. The escape portion 22G avoids interference with the right end portion of the upper elastic support member 25 when the right end portion of the upper elastic support member 25 made of a linear spring is hooked to the hook portion 22B of the guide connection portion 22A. It is for improving the property. In addition, since such a chevron-shaped escape portion 22G is not essential, the escape portion 22G can be omitted as shown by a two-dot chain line in FIG.

  On the other hand, as shown in an enlarged view in FIG. 5, the support bracket 24 has fixing portions (holding portions) 24 </ b> B and 24 </ b> B for holding and fixing the left end portions of the upper elastic support member 25 and the lower elastic support member 26, respectively. It is bent and formed. The fixing portions (holding portions) 24B and 24B are distributed in the vertical direction, and the support pin 24A and the mounting portion are provided therebetween, so that the arrangement is compact. The base portion 24C from which the support pin 24A protrudes and the vicinity of the upper fixing portion (holding portion) 24B are connected via the upper connecting piece 24D, and the base portion 24C and the vicinity of the lower fixing portion (holding portion) 24B are connected. The rigidity of the support bracket 24 is improved by being connected via the lower connecting piece 24E.

  Then, the effect is demonstrated about the vehicle seat S comprised as one Embodiment of the vehicle seat which concerns on this invention. In the vehicle in which the vehicle seat S shown in FIG. 1 is arranged in the driver's seat, as shown in FIG. 7 in an unloaded state in which almost no pressing force is applied to the seat back S2 from the upper body B of the occupant seated on the seat cushion S1. Further, the upper elastic support member 25 and the lower elastic support member 26 do not bend backward.

  On the other hand, in a load state during normal operation in which the occupant's upper body B is pressed against the seat back S2 by inertia force, such as during sudden acceleration of the vehicle, as shown in FIG. 8, the upper elastic support member 25 and the lower elastic member The support member 26 receives the backward movement load and bends backward.

  In this case, since the angle X between the upper elastic support member 25 and the lower elastic support member 26 and the sliding guide portion 22D of the induction coupling portion 22A is larger than 90 °, the upper elastic support member 25 and the lower elastic support member 26 The right end portion is held in a state of being locked to the sliding restriction portion 22E at the front portion of the sliding guide portion 22D. Accordingly, the upper body B of the occupant is appropriately sunk into the seat back S2, and the seating posture of the occupant is stabilized.

  Here, when the other vehicle collides with the rear part of the own vehicle or the rear part of the retreating vehicle collides with another vehicle or a structure, the upper body B of the passenger is Since it is strongly pressed against the seat back S2 by a large inertia force, the upper elastic support member 25 and the lower elastic support member 26 receive a large backward movement load and greatly bend rearward as shown in FIG.

  In this case, since the angle X between the upper elastic support member 25 and the lower elastic support member 26 and the sliding guide portion 22D of the induction coupling portion 22A is smaller than 90 °, the upper elastic support member 25 and the lower elastic support member 26 The right end of the sliding guide slides on the sliding guide portion 22D from the sliding restricting portion 22E at the front of the sliding guide portion 22D toward the rear. The right end portions of the upper elastic support member 25 and the lower elastic support member 26 are received by the position restricting portion 22F and stopped at a predetermined end position.

  Accordingly, the upper body B of the occupant sinks deeply into the seat back S2, and the head of the occupant approaches the headrest S3. As a result, the occupant's head is quickly received by the headrest S3, and the load on the occupant's neck is greatly reduced.

  Incidentally, as in the conventional example, when the upper elastic support member 25 and the lower elastic support member 26 are fixed to the side frame without being able to move rearward at the left and right ends, the upper elastic support member 25 and the lower elastic support member 9, the maximum deflection of the upper elastic support member 25 and the lower elastic support member 26 of the embodiment shown by the solid line is significantly smaller than that shown in FIG.

  FIG. 10 is a graph of displacement-load curves of the upper elastic support member 25 and the lower elastic support member 26 shown by comparing the above-described conventional example with one embodiment. As shown in FIG. 10, the amount of displacement of the upper elastic support member 25 and the lower elastic support member 26 is a conventional example in which one embodiment shown by a broken line is also shown by a solid line until the load is increased (see load F1 in FIG. 10). However, it can be seen that when the load is further increased, the displacement amount of the embodiment indicated by the broken line is larger than the displacement amount of the conventional example indicated by the solid line (see load F2).

  When the rearward load applied to the upper elastic support member 25 and the lower elastic support member 26 is reduced to a predetermined value or less when the large load state at the time of the rear collision of the vehicle is resolved, the upper elastic support member 25 and the lower elastic support member By the contraction restoring force of 26, the right end portions of the upper elastic support member 25 and the lower elastic support member 26 slide from the position restricting portion 22F on the rear side of the slide guide portion 22D toward the front slide restricting portion 22E. 22D slides and autonomously returns to the sliding start position.

  According to the vehicle seat S of the embodiment, the vehicle has the guide connecting portion 22A for connecting the right end portions of the upper elastic support member 25 and the lower elastic support member 26 to the seat back frame 20 so as to be able to be guided rearward. When the occupant's upper body B is pressed against the seat back S2 at the time of a rear collision, the occupant's upper body B can be sunk into the seat back S2 so that the occupant's head can approach the headrest S3. The portion can be effectively protected.

  In particular, since the means for sliding the right end portions of the upper elastic support member 25 and the lower elastic support member 26 rearward is constituted by the sliding guide portion 22D of the induction coupling portion 22A cut and raised by the right side frame 22, the structure Is simple, and an increase in the number of parts can be suppressed.

  In addition, since the right side frame 22 that increases the rigidity of the right side portion of the seat back frame 20 is provided with the guide connecting portion 22A, the upper elastic support of the right side portion of the seat back frame 20 having a high rigidity at the time of a rear collision. The member 25 and the lower elastic support member 26 are greatly depressed, and the upper body B of the occupant can be received. Note that the induction coupling portion 22A does not exist in the left-side portion with low rigidity of the seat back frame 20, but the left-side portion with low rigidity is greatly deformed by falling backward when the rear surface of the host vehicle collides with the upper part of the occupant. Since both the left and right are moved backward, the uncomfortable feeling that the upper body is twisted is suppressed.

  Further, since the sliding guide portion 22D of the guide connecting portion 22A is inclined in the contraction direction of the upper elastic support member 25 and the lower elastic support member 26 from the rear portion toward the front portion, the upper body of the occupant during the rear surface collision of the vehicle When the upper elastic support member 25 and the lower elastic support member 26 that are pushed and extended by B return to the contracted state from the extended state by the contraction restoring force after the rear collision of the vehicle, the upper elastic support member 25 and the lower elastic support member 26 The right end portion can be autonomously returned and moved forward along the sliding guide portion 22D of the guide connecting portion 22A.

  Further, since the reinforcement portion 22C that reinforces the rear portion of the sliding guide portion 22D from the back side is formed in the induction coupling portion 22A, the right end portions of the upper elastic support member 25 and the lower elastic support member 26 are slidably guided. When sliding along the portion 22D, stable sliding can be ensured without hindering the sliding.

  Further, since the upper elastic support member 25 and the lower elastic support member 26 are constituted by linear springs, the right end portions of the upper elastic support member 25 and the lower elastic support member 26 are the sliding guide portions 22D of the induction coupling portion 22A. When sliding along, the sliding can be smoothed.

  Further, the right end portions of the upper elastic support member 25 and the lower elastic support member 26 slide rearward until the rearward movement load acting on the upper elastic support member 25 and the lower elastic support member 26 from the occupant's upper body B reaches a predetermined value. Since the sliding restricting portion 22E that restricts movement is provided in the sliding guide portion 22D, the occupant's upper body B is deeply submerged in the seat back S2 only when the rearward movement load exceeds a predetermined value. be able to.

  In addition, the upper elastic support member 25 and the lower elastic support member 26 that slide rearward are provided with a position restricting portion 22F that stops the right end portion of the lower elastic support member 26 at a predetermined end position. The sliding when the right end portions of the member 25 and the lower elastic support member 26 slide toward the front start position can be started smoothly.

  The vehicle seat S as one embodiment of the vehicle seat according to the present invention has been described above, but the vehicle seat according to the present invention is not limited to the vehicle seat S according to the embodiment, and the structure thereof. Can be appropriately changed. For example, the induction coupling portion 22A cut and raised in the right side frame 22 is various induction coupling portions 27 shown in FIGS. 11 to 13, that is, various inductions composed of different parts welded to the inner side surface of the right side frame 22. The connecting portion 27 can be changed.

  Each of the induction coupling portions 27 shown in FIGS. 11 to 13 is made of a plate material in which a front portion and a rear portion are welded to the inner side surface of the right side frame 22 so as to form a closed section on the inner side surface of the right side frame 22. The front wall portion 27A having the function of the hook portion 22B of the induction coupling portion 22A shown in FIG. 7, the sliding guide portion 27B corresponding to the sliding guide portion 22D, and the sliding restricting portion corresponding to the sliding restricting portion 22E ( Rear sliding restricting portion) 27C.

  Here, the induction coupling portion 27 shown in FIG. 11 is formed on the plate-like portion of the right side frame 22 at the rear end portion of the sliding guide portion 27B that falls in the contraction direction of the upper elastic support member 25 and the lower elastic support member 26. In contrast, a position restricting portion 27F that is inclined at an angle larger than 45 degrees is provided. As shown in the figure, the position restricting portion 27F is formed by bending the sliding guide portion 27B in a step shape. By the position restricting portion 27F, when the wires of the upper elastic support member 25 and the lower elastic support member 26 are positioned at the rear end of the slide guide portion 27B, the slide guide portion 27B and the plate-like portion of the right side frame 22 The wire is not pinched. Thereby, it is easy to return to the front after the upper elastic support member 25 and the lower elastic support member 26 move rearward at the time of a rear collision.

  12 has a large inclination angle with respect to the front-rear direction of the sliding guide portion 27B that falls in the contraction direction of the upper elastic support member 25 and the lower elastic support member 26. For this reason, the upper elastic support member 25 and the lower elastic support member 26 are moved rearward along the sliding guide portion 27B to slide the right ends of the upper elastic support member 25 and the lower elastic support member 26 backward. The load increases. That is, the upper elastic support member 25 and the lower elastic support member 26 are not easily bent backward.

  In the induction coupling portion 27 shown in FIG. 13, the inclination angle of the sliding guide portion 27 </ b> B that falls in the contraction direction of the upper elastic support member 25 and the lower elastic support member 26 is set in two stages. That is, the inclination angle of the front sliding guide portion 27D is set large, and the inclination angle of the rear sliding guide portion 27E is set small. For this reason, the upper elastic support member 25 and the lower elastic support member 26 are moved rearward along the sliding guide portion 27D to move the right end portions of the upper elastic support member 25 and the lower elastic support member 26 backward. The load is large in the front sliding guide portion 27D, and rapidly decreases in the rear sliding guide portion 27E. That is, the upper elastic support member 25 and the lower elastic support member 26 are difficult to bend backward at the initial stage where the backward movement load starts to be applied, but when the large backward movement load is applied beyond the initial stage, the upper elastic support member 25 and the lower elastic support member 26 are greatly bent backward at a stretch. Mu The sliding guide portion 27D in this embodiment can be regarded as a sliding restricting portion formed in a step shape. In this way, by providing the slide guide portion 27D in a step shape, it is possible to realize an operation of moving the upper elastic support member 25 and the lower elastic support member 26 at once when a predetermined load is exceeded.

  In the vehicle seat S according to the embodiment, the upper elastic support member 25 and the lower elastic support member 26 are linear springs that are bent in a continuous waveform. For example, a member that receives a load formed in a net shape. It is good also as a thing of the structure which connected the coil spring to the both right and left both ends.

  In the vehicle seat S of one embodiment, it is preferable to provide return portions for sliding the ends of the upper elastic support member 25 and the lower elastic support member 26 forward. This return part can be constituted by an inclined surface, a spring member, or the like.

  The vehicle seat S according to the embodiment is configured for a vehicle in which the driver's seat is arranged on the right side. However, the vehicle seat S is arranged on the left side by reversing the structure in the left-right direction. Applicable.

  Further, the vehicle seat S according to the embodiment may be configured as a bucket type vehicle seat in which a seat cushion S1, a seat back S2, and a headrest S3 are integrally configured.

  In the said embodiment, although the back regulation load which regulates back sliding of the edge part of an elastic support member was illustrated until the back movement load which acts on an elastic support member reaches a predetermined value, it illustrated. The inclination angle with respect to the front-rear direction in the vicinity of the front end of the sliding guide portion may be made very small so that the sliding restricting portion is eliminated and the elastic support member can be moved from when the rearward movement load is small.

  In the above-described embodiment, the induction connecting portions are provided only on one of the left and right sides of the seat back frame 20, but the induction connecting portions may be provided on both the left and right sides corresponding to both end portions of the elastic support member.

  Furthermore, the vehicle seat of the present invention can be configured as a boat or aircraft seat.

DESCRIPTION OF SYMBOLS 10 Seat cushion frame 11 Pan frame 20 Seat back frame 22 Right side frame 22A Guidance connection part 22B Hook part 22C Reinforcement part 22D Sliding guide part 22E Sliding regulation part 22F Position regulation part 23 Left side frame 24 Support bracket 25 Upper elastic support Member 26 Lower elastic support member 27 Guide connecting portion 27B Sliding guide portion 27C Sliding restricting portion 27D Sliding guide portion 27E Sliding guide portion 27F Position restricting portion S Vehicle seat S1 Seat cushion S2 Seat back S3 Headrest

Claims (9)

A vehicle seat having at least a seat cushion and a seat back,
The seat back includes a seat back frame that constitutes a skeleton, and an elastic support member that elastically supports an upper body of an occupant seated on the seat cushion by connecting left and right end portions to the seat back frame. An inductive coupling portion that couples at least one end of each of the elastic support members to the seat back frame so as to be capable of being guided backwards;
The vehicle seat according to claim 1, wherein the guide connecting portion is provided with a sliding guide portion for sliding the end portion of the elastic support member rearward.   2. The seat back frame according to claim 1, wherein the left and right end portions of the elastic support member are connected to each other at a right and left portion, and the induction connecting portion is provided only on a rigid side. Vehicle seat.   The vehicle seat according to claim 1, wherein a return portion for sliding the end portion of the elastic support member forward is provided.   The sliding guide portion has a direction of contraction of the elastic support member from the rear toward the front so that the end of the elastic support member slides forward with respect to the seat back frame by the contraction restoring force of the elastic support member. The vehicle seat according to any one of claims 1 to 3, wherein the vehicle seat is inclined toward the vehicle.   The vehicle seat according to any one of claims 1 to 4, wherein the induction connecting portion is formed by being cut and raised in a constituent member of the seat back frame.   The vehicle seat according to any one of claims 1 to 5, wherein the induction connecting portion is provided with a reinforcing portion that reinforces the back side of the sliding guide portion.   The vehicle seat according to any one of claims 1 to 6, wherein the elastic support member is constituted by a linear spring.   The sliding guide portion restricts sliding of the end portion of the elastic support member to the rear until the rearward movement load acting on the elastic support member reaches a predetermined value from the upper body of the occupant seated on the seat cushion. The vehicle seat according to any one of claims 1 to 7, wherein a sliding restricting portion is provided.   The position of the said sliding guide part is provided with the position control part which stops the edge part of the said elastic support member which slides back to a predetermined | prescribed termination position. The vehicle seat according to claim 1.

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