JP5776506B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat. More specifically, the present invention relates to a vehicle seat that is configured such that a seat back is folded forward and folded on an upper surface portion of a seat cushion.

  2. Description of the Related Art Conventionally, in a vehicle seat, a technique is known in which a seat back is folded forward and folded on an upper surface portion of a seat cushion (Patent Document 1). In the vehicle seat, when the seat back is moved forward, both side support portions bulging in a convex shape formed on both side portions of the seat cushion can be sunk downward. As a result, the vehicle seat is configured to be folded thinly in a state in which both shapes are matched so that no gap is formed between the seat back and the seat cushion.

JP 2000-316663 A

  In order to fold the vehicle seat thinly with a simpler configuration without using the configuration as described in Patent Document 1, for example, the seat back and the seat cushion are formed in a flat shape, It is conceivable that both shapes can be matched. However, in such a case, the side support cannot be set and the ride comfort is impaired. The present invention was devised as a solution to the above-mentioned problem, and the problem to be solved by the present invention is to secure a comfortable ride by constructing a seat back and a seat cushion so that they can be folded thinly. However, there is a simple configuration.

In order to solve the above problems, the vehicle seat of the present invention takes the following means.
1st invention is a vehicle seat comprised so that a seat back might be moved forward and folded to the upper surface part of a seat cushion. The seat back includes a pad made of a cushion material that elastically receives the backrest load of the seated occupant, and a support member that is laid between the skeletons of the seat back and supports the pad from the rear side. The seat back has a back surface that receives the back of the seated occupant and has a flat surface shape in the seat width direction, and has a shape that matches the shape of the upper surface of the seat cushion when the seat is tilted forward. However, the seat back has a configuration in which the support member and the pad are spaced apart from each other in the front-rear direction of the seat and a gap is formed between them at the center where the back of the seated occupant hits. When the seat back is subjected to the backrest load of the seated occupant, the pad bends in the gap between the support member at the center portion and the side support portions protrude from the center portion toward the front side of the seat at both side portions of the seat back. Is formed.

  According to the first aspect of the present invention, the seat back and the seat are configured such that the backrest surface of the seat back is a flat surface shape in the seat width direction and is fitted to the upper surface portion of the seat cushion when the vehicle is tilted forward. The structure which can fold a cushion thinly can be comprised simply. Furthermore, the support member and the pad are separated from each other at the center portion of the seat back so that a gap is set between them, so that when the seated occupant leans against the seat back, the pad is rearward at the center portion of the seat back. Since it becomes a structure greatly dented in the side, both the side parts can be made to protrude to the front side, and can be functioned as a side support part. In this way, the ride comfort can be ensured satisfactorily while the vehicle seat is configured to be folded thinly.

  The second invention is the following structure in the first invention described above. That is, the center portion of the seat back has a configuration in which the pad and the support member are in contact with each other in the upper region, and the pad and the support member are separated from each other in the lower region. The lower region portion has a shape protruding to the front side of the seat from the upper region portion.

  According to the second aspect of the invention, the thickness of the pad in the lower region portion is reduced by forming the central portion of the seat back so that the lower region portion protrudes forward of the seat relative to the upper region portion. A gap can be set between the wire and the wire. Therefore, the riding comfort of the vehicle seat can be further ensured.

  A third invention has the following configuration in the first or second invention described above. That is, the support member is constituted by a pair of left and right wires that are installed in the seat height direction between the skeletons of the seat back. The pad has a rear surface supported by each wire and skeleton, and is formed in a continuous mountain shape in which a plurality of mountain-shaped curved surfaces protruding rearward in the seat width direction are formed, and the rear surface is less extensible than the pad. A planar backing material is integrally bonded in a laminated manner. The rear mountain range is such that each wire fits at the boundary between the mountains and one mountain shape fits between each wire and between each wire and the skeleton. It is set as the structure supported from.

  According to the third aspect of the invention, the pad is supported from the rear side in such a manner that each mountain in the rear surface of the mountain is fitted between each wire and between each wire and the skeleton. With this configuration, the backrest load received from the seated occupant is elastically received in a manner in which a repulsive force is applied so as to surround the back of the seated occupant from the rear side. In addition, by setting a backing material with low extensibility on the rear surface of the pad, the backrest load applied to the pad can be stably received by the tension action of the backing material so as not to sink the pad too much. . Therefore, even if the pad is thin, good riding comfort can be obtained.

It is the perspective view which showed the outline of the vehicle seat. It is the perspective view which showed the frame | skeleton structure of the vehicle seat. It is the perspective view which showed the state which brought forward the seat back. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. It is sectional drawing which showed the state in which the backrest load was applied to the seat back. It is the VIII-VIII sectional view taken on the line of FIG. It is a perspective view of a locking mechanism. It is the side view which showed the state before the lock | rock of a locking mechanism. It is the side view which showed the locked state of the locking mechanism.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

  First, the configuration of the vehicle seat 1 according to the first embodiment will be described with reference to FIGS. As shown in FIGS. 1 to 2, the vehicle seat 1 of the present embodiment is configured as a rear side seat of a light four-wheel vehicle, and has a horizontally long seat width that can be seated by two people on the left and right. Is formed. The vehicle seat 1 includes a seat back 10 that serves as a backrest for a seated occupant, a seat cushion 20 that serves as a seating portion, and a headrest 30 that serves as a support for the head. The seat back 10 and the seat cushion 20 are each formed in a horizontally long shape continuous in the seat width direction, and have a bilaterally symmetric configuration. The headrest 30 is installed at two upper positions on the left and right sides of the seat back 10.

  The seat back 10 is configured by a seat back frame 11 having an internal frame structure assembled in a square frame shape. The seat back frame 11 is hinged at its lower left and right sides so that it can be rotated forward and backward with respect to the floor F by hinge pins 11C. The seat back frame 11 is normally configured such that the strikers 11E coupled to the left and right side frames are locked by the lock mechanisms 50 installed on both outer walls of the vehicle. The front-rear rotation with respect to the floor F is held in a locked state. As a result, the seat back 10 is normally held in a state in which the backrest angle is fixed.

  The seat back 10 is folded on the upper surface portion of the seat cushion 20 by releasing the lock state of each lock mechanism 50 and tilting it forward around each hinge pin 11C (see FIG. 3). ). By this folding, the seat back 10 is in a state in which the shape is matched with the upper surface portion of the seat cushion 20 and is folded into a thin state without floating. A specific configuration will be described. Both the seat back 10 and the seat cushion 20 have a simple configuration with a relatively thin cushion structure. The seat back 10 has a backrest surface that receives the seating load of the seated occupant in a flat surface shape in the seat width direction, and the seat cushion 20 also has a seating surface that receives the seating load. It is formed in a flat surface shape in the width direction.

  However, more specifically, the seat back 10 has a cross-sectional shape in which the lower region portion 10B2 that is in the vicinity where the seated occupant hits the waist portion protrudes in a mountain shape toward the front side with respect to the upper region portion 10B1. (See FIG. 3). The seat cushion 20 has a cross-sectional shape in which the rear region 20A2 that is in the vicinity of supporting the seat occupant's buttocks is recessed downward in a valley shape with respect to the front region 20A1. With such a cross-sectional shape, the seat back 10 has enhanced support force in the vicinity of the waist where the seat occupant's backrest load is particularly large, while the back sinks behind the waist. It has a comfortable structure that is easy to get into. Further, the seat cushion 20 has a rear region 20A2 that supports the bottom of the seated occupant sinking downward, and the front region 20A1 that supports the thigh bulges upward. In addition, the hips are less likely to shift forward, and the thigh support is good and the ride is comfortable.

  Further, the seat back 10 will be described in detail later, but when the occupant leans against each of the left and right positions, the respective central portions 10A1 to which the respective waists are pressed are rearward of both side portions 10A2. The structure is easy to sink to the side. With this configuration, the seat back 10 is in a state where both side portions 10A2 of each central portion 10A1 on which each occupant leans protrudes forward with respect to each central portion 10A1, so that the body of each occupant can be seen from both outer sides. It is set as the structure which can function as a side support part which can be supported.

  Hereinafter, the configuration of each part of the vehicle seat 1 will be described in detail. The seat back 10 includes a rectangular frame-like seat back frame 11 forming a frame structure therein, a mat-type pad 12 forming a cushion structure, and a planar skin member 13 forming an outer skin. In the seat back frame 11, an upper frame 11A made of an inverted U-shaped steel pipe material (round pipe) and a lower frame 11B made of a straight steel pipe material (round pipe) are welded and joined in a square frame shape. It has a configuration.

  As shown in FIG. 8, the seat back frame 11 is in a state in which L-shaped brackets 11D are rotatably connected to both ends of the lower frame 11B via hinge pins 11C. The bent plate portions on the rear side of each L-shaped plate are respectively applied to the floor panel Fp on the floor F and fastened and fixed by bolts 11D1, so that they can rotate on the floor F. The shaft is connected. Each of the hinge pins 11C is integrally welded to each end of the lower frame 11B, and is pivotally coupled to each bracket 11D through a washer 11C1 so as to be rotatable. It is supposed to be in a state.

  Further, as shown in FIG. 2, a round bar-like striker 11E is integrally welded to the seat back frame 11 on both the left and right sides of the upper frame 11A so as to extend outward. Are combined. Further, the seat back frame 11 has a total of four wires 11F made of a pair of left and right steel wires spanned in the height direction between the upper frame of the upper frame 11A and the lower frame 11B. Welded and bonded together. Each of the pair of wires 11F functions as a support member that supports the pad 12 arranged on the front surface side from the rear side. Here, the wire 11 </ b> F corresponds to a “support member” of the present invention.

  Each of the pair of wires 11F is arranged so as to extend in the height direction between the upper frame 11A and the lower frame 11B, and the width of the mutual separation gradually decreases from the upper side of the seat toward the lower side. It is in a state where it is arranged to be inclined toward the inward sides. Accordingly, the pad 12 is supported by the wires 11F according to the shape of the back of the seated occupant, and the upper region 10B1 of the seat back 10 supports the pad 12 with a wide support width according to the shoulder width of the seated occupant. The lower region 10B2 of the seat back 10 is configured to support the pad 12 with a narrow support width that matches the waist of the seated occupant.

  Further, support wires 11G functioning as stays for supporting the headrests 30 are integrally welded to the upper frame of the upper frame 11A. These support wires 11G are formed in an inverted U shape, their lower end portions are welded and fixed to the upper frame 11A, and the upper portions are inserted into the respective headrests 30 from the lower side and fitted. It is said that it was in the state. Here, each headrest 30 has a pad 31 made of a cushion material formed by foaming urethane resin inside, and the entire surface thereof is covered with a cloth bag-like skin material 32. Each headrest 30 is mounted in such a manner that each support wire 11G is inserted into a slit placed in the lower surface portion thereof, so that the headrest 30 is stably pressed against each stay by the elastic force of each pad 31 therein. It is configured to be supported and fixed.

  As shown in FIGS. 4 to 6, the pad 12 of the seat back 10 described above is assembled from the front side to the above-described square frame-like seat back frame 11, and each of the upper, lower, left, and right peripheral portions thereof is the seat. Each frame portion of the back frame 11 is assembled in a state of being covered in a form of being wound from the outer peripheral side to the rear side. The pad 12 is covered with a cloth bag-like skin material 13 from the upper side and stretched to cover the entire surface, and the pad 12 is pressed against the seat back frame 11. As a state, the seat back frame 11 is assembled in a state of being held in a fixed state.

  Here, the pad 12 is made of a cushion material formed by foaming urethane resin, and is configured to elastically and softly receive the backrest load of the seated occupant. The pad 12 is covered with the skin material 13 on the surface thereof, so that the skin material 13 is put on the backrest surface 12A and the upper, lower, left and right side surfaces. The shape is formed. As shown in FIG. 4, the pad 12 has a lower region 12A2 in the vicinity where the seated occupant hits the waist, and is formed thicker than the upper region 12A1 above it, and It is formed in a shape bent in a shape protruding in a mountain shape on the front side.

  Thus, the pad 12 is in a state where the rear surface 12B is in contact with each wire 11F from the beginning and supported from the rear side (see FIG. 5) in the upper region 12A1, while the lower side thereof The region 12A2 has a configuration in which a gap 12A3 is formed between the rear surface 12B and each wire 11F (see FIG. 6). Specifically, the gap 12A3 (see FIG. 6) is formed between the rear surface 12B of each central portion 10A1 of the pad 12 and each wire 11F, and each side portion 10A2 outside the seat of the pad 12 The rear surface 12B is in contact with the frame on each side of the seat back frame 11 and is supported from the rear side. Further, each side portion 10A2 inside the seat of the pad 12 has a thicker shape than each central portion 10A1 because it is not supported by the above-described wires 11F or the frames on each side of the seat back frame 11. In addition, the resilient force is less likely to bend than each central portion 10A1.

  Therefore, when the seat occupant's backrest load is applied to each central portion 10A1 described above with respect to the seat back 10 having the above configuration, the pad 12 abuts on the rear surface 12B in the upper region portion 12A1 (see FIG. 5). The above-described backrest load is received at the position by the support by each wire 11F. However, as shown in FIG. 7, the lower region 12A2 of the pad 12 reaches the position where the rear surface 12B contacts the wire 11F. It moves to the back side in the gap 12A3 (see FIG. 6), and receives the support by the wires 11F and receives the load at a position recessed to the rear side from both side portions 10A2. As a result, the seat back 10 (the pad 12 thereof) has a central portion 10A1 of the lower region portion 10B2 on which the seated occupant leans, and is recessed to the rear side larger than the side portions 10A2, and the both sides The portion 10A2 projects more forward than the center portion 10A1 to the front side of the seat so that it can function well as a side support portion.

  Here, as shown in FIG. 4, the rear surface 12 </ b> B of the pad 12 has a flexible surface-like spunbond nonwoven fabric having a lower extensibility than the pad 12 (for example, trade name Tafnel (registered trademark) manufactured by Mitsui Chemicals, Inc.). 12C is impregnated together at the time of foam molding of the pad 12, and is provided in a state of being integrally bonded in a laminated form. As shown in FIGS. 5 to 7, the rear surface 12 </ b> B of the pad 12 is formed in a continuous mountain shape in which a plurality of mountain-shaped curved surfaces protruding rearward of the seat are continuous in the seat width direction. The continuous mountain shape of the rear surface 12B includes a central mountain portion 12B1 formed in a mountain width that fits between each pair of wires 11F, and a mountain portion on both sides formed as a mountain portion continuous to both sides thereof. 12B2, and each wire 11F is fitted in each valley 12B3 that is the boundary between each central peak 12B1 and the peak 12B2 on both sides thereof, and support from the rear side by each wire 11F It is configured to receive.

  Specifically, among the above-described peak portions, the peak portions 12B2 on each side outside the seat are fitted between the wire 11F outside the seat and the side frame outside the seat back frame 11, and thereby the rear side. It is configured to receive support from. In addition, the peak portion 12B2 on each side inside the seat has a wire 11F inside the seat, a hardness structure formed by itself being thick, and an upper portion and a lower portion thereof at the upper and lower sides of the seat back frame 11. The structure is such that the backrest load is received by the structure supported by the frame.

  As shown in FIGS. 5 and 7, when the pad 12 having the above configuration receives a backrest load of a seated occupant and receives a pressing force on the rear side, the center ridges 12B1 and the ridges 12B2 on both sides thereof Each wire 11F fits into each trough 12B3 between, and each center peak 12B1 bends so as to intensify the curve between each wire 11F, and the peaks 12B2 on both sides are similarly The wire 11F is bent so as to strengthen the curve backward from the support point by the wire 11F. At this time, each crest of the pad 12 exhibits a strong support repulsive force because the backing material 12C is bonded to the rear surface 12B in a laminated manner, thereby suppressing the extension of the respective circumferences. Each of the mountain ranges forms a form for wrapping the occupant's body from the rear side to receive the backrest load of the occupant. Thus, even when the pad 12 has a thin wall thickness, it is possible to restrain the occupant's body from the side not only when the vehicle is traveling, but also when a lateral load is applied such as cornering. A comfortable configuration with good support that can exert power is achieved.

  The support structure using the continuous mountain shape of the pad 12 and the backing material 12C as described above is also applied to the seat cushion 20 (see FIGS. 1 and 4). Here, the seat cushion 20 includes a rectangular frame-shaped seat cushion frame 21 forming a frame structure therein, a mat-type pad 22 forming a cushion structure, and a surface-shaped skin material 23 forming an outer skin. ing. The seat cushion frame 21 is configured by assembling a steel pipe material (round pipe) into a square frame shape, and is connected to the floor panel Fp on the floor F by a coupling structure using a plug-in fitting structure (not shown). The floor F is provided in an integrally coupled state.

  A total of four wires 21A made of a pair of left and right steel wires are stretched between the front and rear frames of the seat cushion frame 21 in the front-rear direction of the seat, and are integrally welded and coupled. Each of the pair of wires 21A functions as a support member that supports the pad 22 disposed on the upper surface side from the lower side. The same support structure as the support structure of the pad 12 in the seat back 10 described above is applied to the support structure that supports the pad 22 from below with the wires 21A and the seat cushion frame 21.

  The support structure of the pad 22 of the seat cushion 20 will be described in the light of the corresponding support structure of the pad 12 of the seat back 10 shown in FIG. That is, on the rear surface 12B of the pad 12 (the bottom surface 22B of the pad 22), a flexible surface-shaped spunbonded nonwoven fabric (for example, trade name Tafnel (registered by Mitsui Chemicals, Inc.)) that is less extensible than the pad 12 (pad 22). A backing material 12C (backing material 22C) made of a trademark) is impregnated together at the time of foam molding of the pad 12 (pad 22), and is provided in a state of being integrally bonded in a laminated form. In addition, the rear surface 12B of the pad 12 (the bottom surface 22B of the pad 22) is formed in a continuous mountain shape in which a plurality of mountain-shaped curved surfaces protruding in the seat rear side (sheet lower side) are continuous in the sheet width direction. The continuous mountain shape of the rear surface 12B (bottom surface 22B) includes a central mountain portion 12B1 (central mountain portion 22B1) formed in a mountain width that fits between each pair of wires 11F (wire 21A), and Each side crest 12B2 (both sides crest 22B2) formed as a crest connected to both sides, each center crest 12B1 (center crest 22B1) and the crests on both sides Each wire 11F (each wire 21A) fits in each trough 12B3 (each trough 22B3) that becomes a boundary with 12B2 (peak portion 22B2 on both sides), and the rear side by each wire 11F (each wire 21A) It is configured to receive support from the (lower side).

  Specifically, among the mountain portions, the mountain portions 12B2 on each side outside the seat (the mountain portions 22B2 on each side) are the wire 11F (wire 21A) outside the seat and the seat back frame 11 (seat cushion frame 21). It is configured to be fitted between the outer side frames and receive support from the rear side (lower side). Further, the crest 12B2 on each side inside the seat (crest 22B2 on each side) includes a wire 11F (wire 21A) on the inside of the seat, and a hardness structure formed by itself being thick, Backrest load (sitting load) due to the upper and lower parts (front part and rear part) supported by the upper and lower frames of the seat back frame 11 (seat cushion frame 21) and the (front and rear frames). It is configured to catch.

  When the pad 12 (pad 22) configured as described above receives a backrest load (sitting load) of the seated occupant and receives a pressing force on the rear side (downward side), each center peak 12B1 (center peak 22B1) Each wire 11F (each wire 21A) fits into each trough 12B3 (each trough 22B3) between the crest 12B2 on each side and the crest 12B2 on both sides (each trough 22B3), and each center crest 12B1 ( The central peak portion 22B1) is bent so as to bend backward (downward) between the wires 11F (each wire 21A), and the peak portions 12B2 on both sides (the peak portions 22B2 on both sides) are also the same. Next, the wire 11F (each wire 21A) is bent from the support point as the starting point so as to strengthen the curve backward (downward). At this time, each crest portion of the pad 12 (pad 22) is stretched in the circumference because the backing material 12C (lining material 22C) is bonded to the rear surface 12B (bottom surface 22B). Since it can be suppressed, it has a structure that receives strong occupant's back load (sitting load) by demonstrating strong support repulsive force, forming a form that wraps the occupant's body from the back side (downward side) by each mountain shape Yes. As a result, even when the pad 12 (pad 22) is thin, the body of the occupant is restrained from the side not only when the vehicle is traveling but also when a lateral load is applied such as cornering. A comfortable configuration with good support that can exert a repulsive force is achieved.

  Next, the configuration of each lock mechanism 50 that locks the backrest angle of the seat back 10 described above will be described. Since each lock mechanism 50 has the same configuration, the following description will be made with reference to FIGS. 9 to 11 on behalf of one of them. As shown in FIGS. 9 to 11, the lock mechanism 50 includes a base plate 51, a hook 52, a pole 53, a tension spring 54, and an operation arm 55. The base plate 51 is integrally fixed to the vehicle body wall and has a recess 51A that can receive the striker 11E from the front side of the vehicle. The hook 52 is rotatably supported by the base plate 51 by the first connecting shaft 52A, and the pole 53 is integrated with the operation arm 55 by the second connecting shaft 53A with respect to the base plate 51. And is pivotally supported. The tension spring 54 is hooked between the hook 52 and the pole 53, and is configured to apply an urging force in a direction in which the hook 52 and the hook 53 are pulled together.

  As shown in FIG. 10, the hook 52 is normally in a state in which it is urged to rotate clockwise by the tension spring 54 in the illustrated clockwise direction, and is engaged with the locking plate portion 51B of the base plate 51 (initial position). Position). In this initial state, the hook 52 is in a state where an upper arm portion 52 </ b> B that extends in the shape of its arm projects into the recess 51 </ b> A of the base plate 51. At this time, the pole 53 is held in a state where it is abutted against the upper arm 52B of the hook 52 and locked as a state of being urged to rotate counterclockwise by the urging force of the tension spring 54. Yes.

  The hook 52 rotates as if the striker 11E is pushed into the recess 51A of the base plate 51, so that the upper arm 52B is pushed rearward (right side in the figure) by the striker 11E, and is already on the outer periphery. The lower arm portion 52C formed so as to extend in the form of one arm is turned to the back side (the left side surface in the drawing) of the striker 11E to close the recess 51A (see FIG. 11). When the lower arm portion 52C is in a rotational position where the recess 51A is closed, the pole 53 is formed by protruding the corner portion 53B formed by partially protruding the hook 52 by the urging force of the tension spring 54. The upper arm 52B rotates in a state of being immersed under the step, and the hook 52 is prevented from returning in the clockwise direction (locked state). As a result, the striker 11E is held in a state (locked state) constrained in the space of the recess 51A closed by the lower arm portion 52C of the hook 52.

  In the locked state of the hook 52, the operation arm 55 integrated with the pole 53 is pushed downward in the drawing via the push rod 55A by the operation of a push button (not shown) installed on the vehicle body wall. It is canceled by doing. Specifically, when the operation arm 55 is pushed downward and rotated in the clockwise direction in the figure, the corner 53B of the pole 53 is engaged with the upper arm 52B of the hook 52 (it has entered under the step). The state of the return rotation of the hook 52 is released. As a result, as shown in FIG. 10, the hook 52 is rotated in the clockwise direction as shown in the figure by pushing the striker 11E to the outside of the recess 51A by the urging force of the tension spring 54, and the striker 11E is locked. To release. The above is the configuration of the lock mechanism 50. As shown in FIG. 1, each of the lock mechanisms 50 is covered with a resin interior panel BP that covers the vehicle body wall, and each striker 11E is formed from each slit hole BP1 formed in the interior panel BP. Are respectively received or removed from the vehicle front side into the recess 51A.

  Thus, according to the configuration of the vehicle seat 1 of the present embodiment, the backrest surface of the seat back 10 is a flat surface shape in the seat width direction, and the shape is fitted to the upper surface portion of the seat cushion 20 when the vehicle is tilted forward. Thus, the configuration in which the seat back 10 and the seat cushion 20 can be folded thinly can be simply configured. Further, the above-mentioned front side surfaces of the seat back 10 and the seat cushion 20 are flat in the seat width direction, that is, a shape having no dent in the center, so that the skin material 13 is suspended and floats or wrinkles Therefore, it is not necessary to devise so as to prevent the occurrence of the occurrence of the problem, and the structure of the skin material 13 and its attachment can be simplified.

  Furthermore, in each central portion 10A1 of the seat back 10, when the seat occupant leans against the seat back 10 by separating the wires 11F and the pads 12 and setting a gap 12A3 therebetween, the seat back Since the pad 12 is greatly recessed rearward in each of the central portions 10A1 of 10, the side portions 10A2 can be protruded forward to function as side support portions. That is, even if there is no gap 12A3 between each central portion 10A1 of the pad 12 and each wire 11F, each central portion 10A1 to which a backrest load is applied is recessed rearward from both side portions 10A2 on both sides. Although the portion 10A2 protrudes forward, by setting the gap 12A3 as described above, it is possible to make the side portions 10A2 protrude prominently and improve the functionality as the side support portion. In this way, the ride comfort can be ensured satisfactorily while the vehicle seat 1 is configured to be folded thinly.

  Further, each center portion 10A1 of the seat back 10 has a shape in which the lower region portion 10B2 protrudes forward of the seat from the upper region portion 10B1, thereby reducing the thickness of the pad 12 of the lower region portion 10B2. Without any problem, the gap 12A3 can be set between the wire 11F and the wire 11F. Therefore, the riding comfort of the vehicle seat 1 can be further ensured. Further, the seat back 10 is formed in such a manner that each mountain which is a continuous mountain shape of the rear surface 12B of the pad 12 is fitted between each wire 11F and between each wire 11F and the seat back 10 frame. By being configured to be supported from the rear side, the backrest load received from the seated occupant is elastically received in a manner in which a repulsive force is applied so as to surround the back of the seated occupant from the rear side. Further, by setting the backing material 12C having low extensibility on the rear surface 12B of the pad 12, the backrest load applied to the pad 12 is stabilized so as not to sink the pad 12 too much by the tension action of the backing material 12C. Will be accepted. Therefore, even if the pad 12 is thin, good riding comfort can be obtained.

  As mentioned above, although the embodiment of the present invention has been described using one example, the present invention can be implemented in various forms in addition to the above example. For example, the vehicle seat may have a seat structure for one person. Further, the pad of the seat back may have a flat surface shape in which the entire backrest surface is flush. Even in this case, by setting a gap between the pad and the support member in the central portion, the central portion can be greatly recessed when the back is stowed and both side portions can be projected as side support portions to function. The backrest surface of the seat back may have a surface shape that is inclined to be flush with the pad so that the thickness of the pad increases from the upper side toward the lower side. This is because by increasing the thickness of the portion that supports the vicinity of the waist of the pad, it is possible to increase the support force of the waist and configure a support structure with good riding comfort.

  In addition, the gap set between the center part of the pad and the support member can be obtained by lowering the support member partially to the rear side, rather than bending the pad shape forward or partially thinning it. It may be formed. As a result, it is possible to configure a support structure with good riding comfort without reducing the thickness of the pad. Further, in the above-described embodiment, the structure in which each side portion on the inner side of the pad sheet is not supported from the rear side is shown, but a support member such as a wire or a frame is disposed on this part, and the pad sheet is arranged. You may make it support each inner side part from the back side.

  In addition to the non-woven fabric, the backing material may be other fabrics made of woven fabric or knitted fabric, and various planar members having lower extensibility than pads such as leather and resin layers. Further, the bonding of the backing material to the rear surface of the pad may be performed using other bonding means such as adhesion.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 10 Seat back 10A1 Central part 10A2 Side part 10B1 Upper side area part 10B2 Lower side area part 11 Seat back frame 11A Upper frame 11B Lower frame 11C Hinge pin 11C1 Washer 11D Bracket 11D1 Bolt 11E Strike 11F Wire support member
11G Support wire 12 Pad 12A Backrest surface 12A1 Upper region portion 12A2 Lower region portion 12A3 Clearance 12B Rear surface 12B1 Central mountain portion 12B2 Side mountain portion 12B3 Valley portion 12C Backing material 13 Skin material 20 Seat cushion 20A2 Front region 20A1 Side region portion 21 Seat cushion frame 21A Wire 22 Pad 22B Bottom surface 22B1 Central mountain portion 22B2 Side mountain portion 22B3 Valley portion 22C Backing material 23 Skin material 30 Headrest 31 Pad 32 Skin material 50 Lock mechanism 51 Base plate 51A Recessed portion 51B Locking Plate portion 52 Hook 52A First connecting shaft 52B Upper arm portion 52C Lower arm portion 53 Pole 53A Second connecting shaft 53B Corner portion 54 Tension spring 55 Operation arm 55A Push rod BP Interior panel BP1 Lit hole F Floor Fp Floor panel

Claims (3)

It is a vehicle seat configured to fold the seat back forward and fold it on the upper surface of the seat cushion,
The seat back is
A pad made of a cushion material that elastically receives the backrest load of the seated occupant;
A support member provided between the skeleton of the seat back and supporting the pad from the rear side;
The seat back has a flat back surface in the seat width direction for receiving the back of the seated occupant, and is shaped so as not to float on the upper surface of the seat cushion when it is tilted forward. However, in the central portion where the back of the seated occupant hits, the support member and the pad are separated from each other in the seat front-rear direction and a gap is formed between them, and the seat back A side support portion that protrudes toward the front side of the seat from both sides of the seat back at the side portion of the seat back when the backrest load of the seated occupant is applied and the pad bends in the gap between the support member and the support member. A vehicle seat characterized in that is formed. The vehicle seat according to claim 1,
The center portion of the seat back has a configuration in which the pad and the support member are in contact with each other in the upper region, and the pad and the support member are separated from each other in the lower region. The vehicle seat is characterized in that the lower region portion has a shape projecting forward of the seat relative to the upper region portion. The vehicle seat according to claim 1 or 2,
The support member is constituted by a pair of left and right wires laid in the seat height direction between the skeletons of the seat back, and the pad has a rear surface supported by the wires and the skeleton on the seat rear side. A configuration in which a plurality of protruding curved surfaces are formed in a continuous mountain shape in the sheet width direction, and a planar backing material that is less extensible than the pad is integrally bonded to the rear surface in a laminated manner. And the rear mountain range is such that each wire is fitted at the boundary between the mountain and one mountain between each wire and each wire and the skeleton. The vehicle seat is configured to be supported from the rear side in a form in which the shape of the vehicle is fitted.

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