JP2017081459A - Vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply configure a structure which changes a direction of a part of a front surface of a seat back.SOLUTION: The vehicular seat comprises: left and right side frames 20 constituting left and right frames of a seat back; a seat back pad 60 supported on the side frames 20; a first spring (a first S spring 41) which extends in a lateral direction while bending several times in a vertical direction and supports directly the seat back pad 60; a first reciprocating device (a right-side fluctuating mechanism 50R), provided between one side frame 20 and one end part of the first spring, which reciprocates the one end part in a longitudinal direction; and a second reciprocating device (a left-side fluctuating mechanism 50L), provided between the other side frame 20 and the other end part of the first spring, which reciprocates the other end part in the longitudinal direction.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a vehicle seat including left and right side frames constituting left and right frames of a seat back, and a seat back pad supported by the side frames.

  2. Description of the Related Art Conventionally, as a vehicle seat, in order to favorably support a centrifugal force applied to an occupant by turning of a vehicle with a seat back, a configuration in which a part of the front surface of the seat back can be changed left and right is known. (See Patent Document 1). Specifically, in this technology, a plate-like pressure receiving member that supports the seat back pad, a wire that supports the rear surface of the pressure receiving member, and a forward / backward device that moves the left and right ends of the wire back and forth (link member and actuator) ).

JP 2013-189141 A

  However, in the conventional technology, the shape of the pressure receiving member must be made to correspond to the back and shoulders of the occupant, and the structure for changing the orientation of part of the front surface of the seat back becomes complicated. was there.

  Accordingly, an object of the present invention is to simply configure a structure for changing the orientation of a part of the front surface of a seat back.

  In order to solve the above-described problems, a vehicle seat according to the present invention includes a left and right side frame constituting left and right frames of a seat back, a seat back pad supported by the side frame, and a plurality of vertical bendings. A first spring that extends in the left-right direction and directly supports the seat back pad, and is provided between one side frame and one end of the first spring, and advances and retracts the one end in the front-rear direction. An advancing / retreating device; and a second advancing / retreating device that is provided between the other side frame and the other end of the first spring and moves the other end in the front-rear direction.

  According to this configuration, since a pressure receiving member having a complicated shape as in the related art is not provided, a structure for changing the orientation of a part of the front surface of the seat back can be simplified.

  Further, in the above-described configuration, the first spring extends between the plurality of straight portions extending in the vertical direction and spaced apart in the left-right direction, and between the two adjacent straight portions, and A plurality of bent portions that protrude upward or downward, and the first advancement / retraction device and the second advancement / retraction device are arranged so as to be offset in one of the vertical directions with respect to the vertical center of the first spring. Of the plurality of bent portions, the first bent portion closest to the first advance / retract device and the second bent portion closest to the second advance / retract device are convex toward the other in the vertical direction. May be.

  According to this, since the first bent portion and the second bent portion bend in a direction away from each advancement / retraction device, when the first spring is deformed in the front-rear direction, the bending portion interferes with the advancement / retraction device. Can be suppressed.

  In the above-described configuration, the seat back pad includes a cushion member and a hardly deformable member that is harder to deform than the cushion member, and the difficultly deformable member includes the first spring and the first advance / retreat device. Or you may arrange | position adjacent to the said 2nd advance / retreat apparatus in the front-back direction.

  According to this, for example, when one end of the first spring is advanced by the operation of the first advance / retreat device, the first advance / retreat device or the first spring contacts the hardly deformable member and pushes the hardly deformable member forward. . Further, when the other end portion of the first spring is advanced by the operation of the second advance / retreat apparatus, the second advance / retreat apparatus or the first spring contacts the hardly deformable member and pushes the hardly deformable member forward. As a result, the rate at which the force from the advance / retreat apparatus is absorbed by the deformation of the cushion member can be reduced, so that a part of the front surface of the seat back can be tilted favorably.

  In the above-described configuration, the apparatus further includes a second spring that extends in the left-right direction while bending a plurality of times in the vertical direction and supports the seat back pad, and the first advancement / retraction device and the second advancement / retraction device include the first spring. The second spring may be disposed below the first advance / retreat device and the second advance / retreat device.

  According to this, since the second spring is arranged so as to be displaced vertically with respect to each advance / retreat apparatus, when the second spring is deformed in the front-rear direction, the second spring is prevented from interfering with each advance / retreat apparatus. be able to.

  In the above-described configuration, the second spring may be disposed before the first advance / retreat apparatus and the second advance / retreat apparatus.

  According to this, when a load from the occupant is applied to the seat back pad, the load can be received first by the second spring positioned before each advance / retreat apparatus, so the load applied to each advance / retreat apparatus is reduced. can do.

  According to the present invention, since the number of parts can be reduced by the amount of the conventional plate-shaped pressure receiving member not provided, the structure for changing the direction of a part of the front surface of the seat back can be simplified. .

  Further, according to the present invention, the first bent portion closest to the first advance / retreat device and the second bend portion closest to the second advance / retreat device are bent toward the direction away from each advance / retreat device, thereby When the spring is deformed in the front-rear direction, the bent portion can be prevented from interfering with the advance / retreat apparatus.

  According to the present invention, the hardly deformable member is disposed adjacent to the first spring, the first advance / retreat apparatus or the second advance / retreat apparatus in the front-rear direction, so that the force from the advance / retreat apparatus is caused by the deformation of the cushion member. Since the rate of absorption can be reduced, a part of the front surface of the seat back can be tilted well.

  Further, according to the present invention, by providing the second spring below each advance / retreat apparatus, it is possible to suppress the second spring from interfering with each advance / retreat apparatus when the second spring is deformed in the front-rear direction. it can.

  According to the present invention, the second spring is disposed in front of each advancement / retraction device, so that when a load from the occupant is applied to the seat back pad, the second spring is located in front of each advancement / retraction device. Therefore, the load applied to each advance / retreat apparatus can be reduced.

1 is a perspective view of a vehicle seat as a vehicle seat according to an embodiment. It is a perspective view of a seat frame built in a vehicle seat. It is a front view of the seat back frame which comprises a seat frame. It is an expansion perspective view which shows a rocking | fluctuation mechanism. It is a disassembled perspective view which decomposes | disassembles and shows a rocking | fluctuation mechanism. It is a top view which shows operation | movement of a rocking | fluctuation mechanism. It is the perspective view which looked at the seat back pad from the back side. It is a figure which shows a rocking | fluctuation mechanism and a motion of a seat back pad when a vehicle is a straight drive state. It is a figure which shows a rocking | fluctuation mechanism and a motion of a seat back pad when steering is rotated to the right to a predetermined angle. It is a figure which shows a motion of a rocking | fluctuation mechanism and a seat back pad when steering is rotated to the right to an angle larger than a predetermined angle. It is a figure which shows the modification of a seat back pad.

  Next, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, first, the overall configuration of a vehicle seat as an example of a vehicle seat will be briefly described, and then the characteristic part of the present invention will be described in detail.

  As shown in FIG. 1, the vehicle seat S is a seat used for a driver's seat of an automobile, and mainly includes a seat cushion S1, a seat back S2, and a headrest S3.

  A seat frame F as shown in FIG. 2 is built in the seat cushion S1 and the seat back S2. The seat frame F is mainly composed of a seat cushion frame F1 constituting a frame of the seat cushion S1 and a seat back frame F2 constituting a frame of the seat back S2. The seat cushion S1 is configured by covering the seat cushion frame F1 with a seat cushion pad made of a cushion material such as urethane foam and a skin material made of synthetic leather or fabric. The seat cushion frame F1 is installed on the floor of the automobile via the slide rail SL. Thereby, the vehicle seat S can adjust the front-rear position.

The seat back S <b> 2 is configured by covering the seat back frame F <b> 2 with a seat back pad 60 (see FIG. 7) made of a cushion material and a skin material made of synthetic leather or fabric. The lower portion of the seat back frame F2 is rotatably connected to the rear portion of the seat cushion frame F1 via a reclining mechanism RL. As a result, the seat back S2 can tilt forward and backward with respect to the seat cushion S1.
In this specification, front and rear, left and right, and top and bottom are based on an occupant seated on the vehicle seat S in a state where the seat back S2 is not tilted by the reclining mechanism RL.

  The seat back frame F2 mainly includes an upper frame 10, left and right side frames 20, and a lower frame 30, and the upper frame 10, the left and right side frames 20, and the lower frame 30 are integrally formed by welding or the like. It is formed in a combined frame shape.

  The upper frame 10 is made of a pipe material bent in a substantially U shape, and a pair of left and right support brackets 12 for attaching the headrest S3 are fixed to the front side of the horizontal pipe portion 11 extending in the left-right direction by welding. Yes. Further, the left and right vertical pipe portions 13 extending in the vertical direction of the upper frame 10 constitute a left and right side frame 20 integrally with the left and right side frame main body portions 21 coupled to the lower portion thereof.

  The left and right side frame main body portions 21 are formed in a substantially U shape in sectional view by pressing a metal plate or the like, and are arranged to face in the left-right direction. The side frame main body portion 21 is coupled to the vertical pipe portion 13 while holding the vertical pipe portion 13 at the upper portion thereof, and has a protruding portion 22 whose lower portion projects forward from the upper portion. Is formed.

  Further, on the inner side of the frame-shaped seat back frame F2, a first S spring 41 as an example of a first spring, a right swing mechanism 50R as an example of a first advance / retreat device, and an example of a second advance / retreat device are provided. A left swing mechanism 50L and a second S spring 42 as an example of a second spring are disposed. In FIGS. 2 and 3, etc., the swinging mechanisms 50R and 50L are simplified as appropriate.

  As shown in FIGS. 2 and 3, the first S spring 41 extends in the left-right direction while bending a plurality of times in the up-down direction within a predetermined range in the up-down direction, and is disposed at a position where the seat back pad 60 can be directly supported. (See FIG. 8). Specifically, the first S spring 41 is disposed at a position around the chest from the passenger's shoulder.

  The first S spring 41 is disposed between a plurality of linear portions 41a extending in the vertical direction and spaced apart in the left-right direction, and two adjacent linear portions 41a, 41a, and up or down. And a plurality of bent portions 41b that protrude toward the surface. Specifically, the plurality of bent portions 41b arranged on each straight portion 41a are convex upward, connected to the upper ends of two adjacent straight portions 41a and 41a, and below each straight portion 41a. The plurality of arranged bent portions 41b are convex downward and are connected to the lower ends of the two adjacent linear portions 41a and 41a.

  The plurality of upper bent portions 41b are arranged at the same position in the vertical direction, and the plurality of lower bent portions 41b are arranged at the same position in the vertical direction. Of the plurality of bent portions 41b, the first bent portion B1 closest to the right swing mechanism 50R and the second bent portion B2 closest to the left swing mechanism 50L are convex upward.

  Of the plurality of straight portions 41a, the first straight portion A1 closest to the right swing mechanism 50R and the second straight portion A2 closest to the left swing mechanism 50L have a lower end (tip portion) having an upper end ( It is bent so as to be located on the inner side in the left-right direction with respect to the base end portion). Specifically, each of the straight portions A1 and A2 includes a base end portion extending downward from the bent portions B1 and B2, an inclined portion extending from the lower end of the base end portion toward the inner side and the lower side in the left-right direction, And a tip portion extending downward from the lower end. And the base end part of each linear part A1, A2 is rotatably supported by each rocking | fluctuation mechanism 50R, 50L.

  The second S spring 42 is an S spring that is substantially the same as the first S spring 41, and extends in the left-right direction while bending a plurality of times in the vertical direction within a predetermined range in the vertical direction, and can directly support the seat back pad 60. Placed in position. Specifically, the second S spring 42 is disposed below the swing mechanisms 50R and 50L and in front of the swing mechanisms 50R and 50L.

  The second S spring 42 is disposed between a plurality of linear portions 42a extending in the vertical direction and spaced from each other in the left-right direction, and two adjacent linear portions 42a, 42a, and up or down. And a plurality of bent portions 42b that protrude toward the surface. The two straight portions 42a arranged on the outermost left and right sides are configured in substantially the same manner as the first straight portion A1 and the second straight portion A2 described above. The straight portions 42 a arranged on the outermost left and right sides are engaged with L-shaped brackets BR fixed to the side frame main body portion 21.

  The right swing mechanism 50 </ b> R is a mechanism for moving the right end portion of the first S spring 41 forward and backward, and is provided between the right side frame 20 and the right end portion of the first S spring 41. The left swing mechanism 50L is a mechanism for moving the left end portion of the first S spring 41 forward and backward, and is provided between the left side frame 20 and the left end portion of the first S spring 41. Each swing mechanism 50R, 50L is controlled by a control device (not shown), so that the first S spring 41 swings in the same direction as the turning direction of the vehicle. (Centrifugal force) can be received by the first S spring 41.

  Various methods can be adopted as a control method by the control device. As an example, for example, the lateral acceleration and the turning direction are calculated based on signals from the wheel speed sensor and the steering angle sensor, and when the lateral acceleration exceeds a predetermined threshold, the swinging of the outside in the turning direction is performed. There is a method in which the mechanism is operated and the outer end of the first S spring 41 in the turning direction is pushed forward by the swing mechanism.

  The swinging mechanisms 50R and 50L are arranged so as to be offset downward with respect to the center CL of the first S spring 41 in the vertical direction. In other words, the distance from the lower end of each swing mechanism 50R, 50L to the center CL is longer than the distance from the upper end of each swing mechanism 50R, 50L to the center CL. Each swing mechanism 50R, 50L has a symmetrical structure. In the following description, the structure of the right swing mechanism 50R will be described as a representative, and description of the left swing mechanism 50L will be omitted.

  As shown in FIGS. 4 and 5, the right swing mechanism 50 </ b> R mainly includes an actuator 51, a holding bracket 52, a first link member 53, a second link member 54, and a torsion spring 55. It is configured.

  The actuator 51 is a drive source for rotating the first link member 53 and the second link member 54. The actuator 51 includes a stepping motor 51A, a gear box 51B, and an output shaft 51C, and the output shaft 51C extends in the vertical direction. It is arranged along. The driving force from the stepping motor 51A is decelerated by the gear box 51B and transmitted to the output shaft 51C, so that the output shaft 51C rotates at a predetermined angle.

  The holding bracket 52 is a substantially semicircular plate-like member, and is fixed to the vertical pipe portion 13 (side frame 20) by welding or the like via an attachment surface 52A formed in an arc shape. In addition, the holding bracket 52 is formed with a through hole 52B for allowing the output shaft 51C of the actuator 51 to pass therethrough. An upper end surface 51D of the actuator 51 is fixed to the lower surface of the holding bracket 52 by screws or the like (not shown).

  The first link member 53 is a plate-like member formed in a long shape, and one end thereof is fixed to the output shaft 51C of the actuator 51, so that the other end is centered on the output shaft 51C in the front-rear direction. It can swing (see FIG. 6). That is, the first link member 53 is rotatable with respect to the side frame 20.

  Specifically, a cross-sectional view D-type engagement hole 53A that engages with a cross-sectional view D-type tip of the output shaft 51C is formed at one end of the first link member 53, and the other end side has a first An insertion hole 53 </ b> B into which a stepped bolt 56 and a collar 57 that become the swing center of the two link member 54 are inserted is formed. Further, two rectangular plate-like regulating walls 58 that define the swing range of the second link member 54 are fixed to one end side and the other end side of the insertion hole 53B in the first link member 53, respectively. One rectangular fitting hole 53C is formed.

  Accordingly, it is possible to restrict the second link member 54 from swinging with respect to the first link member 53 with the two restriction walls 58. Further, a fixing hole 53D for fixing one end portion 55A of the torsion spring 55 is formed between the engagement hole 53A and the insertion hole 53B in the first link member 53.

  The second link member 54 is rotatably provided on the first link member 53 by the stepped bolt 56, the collar 57, and the nut 59 described above. Specifically, an insertion hole 54 </ b> A through which the shaft portion 56 </ b> A of the stepped bolt 56 is inserted is formed at one end portion of the second link member 54. On the other hand, the stepped bolt 56 has a shaft portion 56A and a medium diameter portion 56C that has a larger diameter than the shaft portion 56A and a smaller diameter than the head portion 56B.

  The collar 57 is rotatably supported in the insertion hole 53B of the first link member 53, and the cylindrical portion 57A through which the shaft portion 56A of the stepped bolt 56 is inserted, and radially outward from the upper end of the cylindrical portion 57A. And an extending flange portion 57B. The cylindrical portion 57 </ b> A is formed so as to slightly protrude from the lower surface of the first link member 53 in a state where the flange portion 57 </ b> B is in contact with the upper surface of the first link member 53.

  The flange portion 57 </ b> B functions as a retaining member that sandwiches and supports the second link member 54 between the intermediate diameter portion 56 </ b> C of the stepped bolt 56 and suppresses the collar 57 from falling downward from the first link member 53. ing. The nut 59 is fastened to the lower end of the collar 57 by being screwed into the shaft portion 56A (screw portion) of the stepped bolt 56 protruding downward from the lower end of the cylindrical portion 57A of the collar 57. . The nut 59 functions as a retaining member that prevents the collar 57 from being pulled upward from the first link member 53 in a state where the nut 59 is fastened to the collar 57.

  That is, the second link member 54 can swing integrally with the first link member 53 together with the stepped bolt 56, the collar 57 and the nut 59. Further, as shown in FIG. 6, the end of the first S spring 41 is rotated at the other end of the second link member 54 (the end opposite to the insertion hole 54 </ b> A: hereinafter, the tip). A connecting hole 54B is formed to be engaged.

  As a result, when the first link member 53 swings forward from the rear initial position (solid line position), the first S spring 41 restricts the distal end portion of the second link member 54 from moving outward in the left-right direction. Thus, the second link member 54 swings in a direction away (opening) from the first link member 53. When the first link member 53 swings from the front position (the position indicated by the two-dot chain line) to the initial position, the second link member 54 approaches (closes) the first link member 53 by a torsion spring 55 described later. ) Swings in the) direction.

  As shown in FIG. 5, a fixing hole 54 </ b> C for fixing the other end 55 </ b> B of the torsion spring 55 is formed between the insertion hole 54 </ b> A and the connection hole 54 </ b> B in the second link member 54.

  The torsion spring 55 is disposed between the first link member 53 and the second link member 54 (mechanistically), and generates a biasing force that pulls the first link member 53 and the second link member 54 together. Is configured to do. That is, the torsion spring 55 is configured to bias the second link member 54 to the initial position (position indicated by a solid line in FIG. 6) with respect to the first link member 53. Thereby, the second link member 54 can be returned to the initial position by the urging force of the torsion spring 55.

  Specifically, the torsion spring 55 includes a coil portion 55C, an L-shaped first arm portion 55D extending radially outward from the lower end of the coil portion 55C, and extending radially outward from the upper end of the coil portion 55C. And an L-shaped second arm portion 55E extending downward.

  The coil portion 55 </ b> C of the torsion spring 55 is disposed so as to surround the medium diameter portion 56 </ b> C (the rotation shaft of the second link member 54 on the first link member 53 side). Accordingly, for example, the right-side swing mechanism 50R can be made more compact than a structure in which the coil portion of the torsion spring is disposed so as not to surround the rotation shaft of the second link member.

  As shown in FIG. 7, the seat back pad 60 includes a cushion member 60A made of urethane foam or the like, and a hardly deformable member 60B that is harder to deform than the cushion member 60A. The cushion member 60A includes a base portion 61 disposed between the occupant and the seat back frame F2, an upper portion 62, a left portion 63, and a right portion 64 extending rearward from the upper end portion, the left end portion, and the right end portion of the base portion 61. An upper flange portion 65 extending downward from the rear end portion of the upper portion 62, a left flange portion 66 extending inward in the left-right direction from the rear end portion of the left side portion 63, and inward in the left-right direction from the rear end portion of the right side portion 64. An extending right flange portion 67 is integrally provided.

  The hardly deformable member 60 </ b> B is a rectangular sheet-like member that is long in the left-right direction, and is made of, for example, a resin plate-like member or a cushion material harder than the cushion member 60 </ b> A, and is integrally provided on the back side of the base portion 61. . In addition, as a manufacturing method of such a seat back pad 60, the method of inject | pouring the material of cushion member 60A in a type | mold etc., after setting the hardly deformable member 60B in the type | mold which forms cushion member 60A, etc. are mentioned, for example. .

  As shown in FIG. 8, the hardly deformable member 60 </ b> B is disposed at a position adjacent to the first S spring 41 in the front-rear direction. 8 to 10, the first S spring 41 is shown in a simplified manner for convenience.

  Specifically, the hardly deformable member 60B is larger than the first S spring 41 in the vertical direction, and the first S spring 41 is disposed within the range of the hardly deformable member 60B in the vertical direction. The hardly deformable member 60 </ b> B and the first S spring 41 may be disposed so as to contact each other when the occupant leans against the seat back pad 60. For example, the occupant does not lean against the seat back pad 60. In the state, they may be arranged with a slight gap therebetween or in contact with each other.

  The base portion 61 has a support surface 61A that supports the back of the occupant. Left and right side support portions 68L and 68R are integrally provided on the left and right sides of the base portion 61 so as to protrude forward from the support surface 61A and support the left and right arms of the occupant from the left and right outer sides. The flange portions 65 to 67 (only the left flange portion 66 and the right flange portion 67 are shown) wrap around the back side of the seat back frame F <b> 2 and sandwich the seat back frame F <b> 2 with the base portion 61. In this state, the seat back pad 60 is supported by the seat back frame F2.

Next, the operation of the swing mechanisms 50R and 50L will be described.
As shown in FIGS. 8 to 10, for example, when the vehicle is turned in the right direction (clockwise in the figure), the left swing mechanism 50L swings forward, so that the first S spring 41 is rotated in the clockwise direction in the figure. Swing. Thereby, the left portion of the hardly deformable member 60B is pushed by the swinging first S spring 41, and a part of the support surface 61A (a portion near the shoulder portion of the occupant) is inclined toward the right side. The applied centrifugal force can be satisfactorily received by the support surface 61A.

As described above, according to this embodiment, the following effects can be obtained.
Since the first S spring 41 that directly supports the seat back pad 60 is swung by the swing mechanisms 50R and 50L, the support surface 61A of the seat back pad 60 is compared with a conventional structure in which a pressure receiving member having a complicated shape is provided. The structure that changes the direction of the left and right can be configured simply.

  Since the first bent portion B1 and the second bent portion B2 are convex upward, that is, bent in a direction away from the swing mechanisms 50R and 50L, when the first S spring 41 is deformed in the front-rear direction, It can suppress that each bending part B1, B2 interferes with rocking | fluctuation mechanism 50R, 50L.

  By arranging the hardly deformable member 60B and the first S spring 41 adjacent to each other in the front-rear direction, the first S spring 41 pushes the hardly deformable member 60B when the first S spring 41 swings. The proportion of force absorbed by the deformation of the cushion member 60A can be reduced, and the support surface 61A can be tilted satisfactorily.

  Since the second S spring 42 is disposed so as to be vertically displaced with respect to the swing mechanisms 50R and 50L, when the second S spring 42 is deformed in the front-rear direction, the second S spring 42 is moved to the swing mechanisms 50R and 50L. Can be prevented from interfering with.

  Since the second S spring 42 is disposed in front of the swing mechanisms 50R and 50L, when the load from the occupant is applied to the seat back pad 60, the second S spring 42 is positioned in front of the swing mechanisms 50R and 50L. Since the load can be received first by the second S spring 42, the load applied to each of the swing mechanisms 50R and 50L can be reduced.

  Although the embodiments of the present invention have been described above, the present invention can be implemented with appropriate modifications as shown in other embodiments below. In the following description, components that are substantially the same as those in the above-described embodiment are given the same reference numerals, and descriptions thereof are omitted.

  In the above embodiment, the hardly deformable member 60B is pushed only by the first S spring 41. However, the present invention is not limited to this, and for example, as shown in FIG. You may comprise so that the deformation member 60B can be pushed. Specifically, in this embodiment, the hardly deformable member 60B is adjacent to the second link member 54 of each of the swing mechanisms 50R and 50L in the front-rear direction. The hardly deformable member 60B and the second link member 54 may be configured to contact at least when the swinging mechanisms 50R and 50L are operated. That is, the hardly deformable member 60 </ b> B and the second link member 54 may be arranged with a slight gap therebetween or in contact with each other when the occupant does not lean on the seat back pad 60. .

  According to this configuration, the hardly deformable member 60B can be pushed not only by the first S spring 41 but also by the left and right swing mechanisms 50R and 50L, so that the orientation of the support surface 61A can be changed more favorably. Can do.

  In the embodiment, the S springs 41 and 42 are exemplified as the first spring or the second spring. However, the present invention is not limited to this, and may be, for example, a coil spring.

  In the above-described embodiment, the swing mechanisms 50R and 50L are exemplified as the advance / retreat apparatus. However, the present invention is not limited to this, and may be an apparatus having a piston that moves forward and backward by hydraulic pressure, for example. Further, the number of link members provided in the swing mechanism is not limited to two as in the above embodiment, but may be one or three or more.

  In the above-described embodiment, the swing mechanisms 50R and 50L are disposed so as to be offset downward with respect to the center CL in the vertical direction of the first S spring 41. However, the present invention is not limited thereto, and is disposed so as to be offset upward. Also good. In this case, the first bent portion and the second bent portion may be convex downward.

  In the above embodiment, the torsion spring 55 is exemplified as a spring that biases the second link member 54 to the initial position with respect to the first link member 53. However, the present invention is not limited to this, and for example, a leaf spring, a wire spring, or the like. Other urging members may be used.

  The specific configuration of the seat frame F (the seat cushion frame F1 and the seat back frame F2) shown in the embodiment is an example, and the present invention is not limited to the configuration of the embodiment. For example, in the above-described embodiment, the left and right side frames 20 of the seat back frame F2 are configured by the pipe-shaped vertical pipe portion 13 and the plate-shaped side frame main body portion 21, but are not limited thereto. The side frame may be composed of only a pipe-shaped frame or may be composed of only a plate-shaped frame.

  In the said embodiment, although the vehicle seat S used by a motor vehicle was illustrated as a vehicle seat, this invention is not limited to this, For example, the sheet | seat used for a ship, an aircraft, etc. It can also be applied to.

20 Side frame 41 1st S spring 50L Left-side swing mechanism 50R Right-side swing mechanism 60 Seat back pad S Vehicle seat S2 Seat back

Claims (5)

Left and right side frames constituting the left and right frames of the seat back;
A vehicle seat comprising a seat back pad supported by the side frame,
A first spring that extends in the left-right direction while bending a plurality of times in the up-down direction and directly supports the seat back pad;
A first advancing / retracting device provided between one side frame and one end of the first spring and moving the one end in the front-rear direction;
A vehicle seat, comprising: a second advancing / retreating device provided between the other side frame and the other end of the first spring and moving the other end in the front-rear direction. The first spring extends in the vertical direction and is arranged between a plurality of linear portions arranged at intervals in the left-right direction and two adjacent linear portions, and protrudes upward or downward. A plurality of bent portions,
The first advancing / retracting device and the second advancing / retreating device are arranged so as to be offset in one of the vertical directions with respect to the vertical center of the first spring,
Of the plurality of bent portions, a first bent portion closest to the first advance / retreat device and a second bend closest to the second advance / retreat device are convex toward the other in the vertical direction. The vehicle seat according to claim 1. The seat back pad includes a cushion member and a hardly deformable member that is less likely to be deformed than the cushion member,
3. The vehicle according to claim 1, wherein the hardly deformable member is disposed adjacent to the first spring, the first advance / retreat apparatus, or the second advance / retreat apparatus in the front-rear direction. Sheet. A second spring that extends in the left-right direction while bending a plurality of times in the up-down direction and supports the seat back pad;
The first advancing / retracting device and the second advancing / retreating device are arranged to be offset downward with respect to the vertical center of the first spring,
4. The vehicle seat according to claim 1, wherein the second spring is provided below the first advance / retreat device and the second advance / retreat device. 5.   5. The vehicle seat according to claim 4, wherein the second spring is disposed in front of the first advance / retreat apparatus and the second advance / retreat apparatus.

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