Vehicle seat

Abstract

To provide a vehicle seat capable of contributing to work efficiency improvement in assembling a seat back frame.SOLUTION: A side frame 38 of a seat back frame 25 continues from a front edge of a plate-like part 38a and is bending molded inward, and has: a front wall 38b which forms a curved area 41 that extends in the vertical direction from around a rotary shaft and reaches an upper frame 39; and a rear wall 38c which continues from a rear edge of the plate-like part 38a, is bending molded inward, and forms a curved area 42 that extends in the vertical direction from around the rotary shaft and reaches the upper frame 39. An inner edge of the front wall 38b has a projection piece 69 that spreads inward from a virtual outline 68 corresponding to the shape of the upper frame 39 and is laid on a front surface wall 54 of the upper frame 39 from the back.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a vehicle seat equipped with a seat back frame having left and right side frames that extend around a rotation axis along a vertical plane perpendicular to the rotation axis and have plate-shaped portions extending upward along the vertical plane, and an upper frame that connects the left and right side frames above the rotation axis. [Background technology]

[0002] Patent Document 1 discloses a vehicle seat equipped with a seat back connected to a seat cushion so as to be reclined. The seat back extends vertically upward from a rotation axis and has left and right side frames that support a seat back pad, and an upper frame that connects the left and right side frames above the reclining rotation axis. The front and rear walls of the side frames cover the ends of the upper frame over their entire vertical range. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-162033 A Summary of the Invention [Problem to be solved by the invention]

[0004] The two side frames sandwich the upper frame from both sides. When assembling the upper frame, the left end of the upper frame is inserted into the left side frame, and the right end of the upper frame is inserted into the right side frame. Therefore, the assembly work is cumbersome. It is desirable to improve the work efficiency.

[0005] An object of the present invention is to provide a vehicle seat that can contribute to improving the work efficiency in assembling a seat back frame. [Means for solving the problem]

[0006] According to a first aspect of the present invention, there is provided a seat back frame having left and right side frames that extend around a rotation axis along a vertical plane perpendicular to the rotation axis and have plate-shaped portions extending upward along the vertical plane, and an upper frame that connects the left and right side frames above the rotation axis, the upper frame being formed by bending a plate material and having a front wall partitioned by an upper ridgeline and a lower ridgeline extending horizontally, an upper wall continuing from the upper ridgeline and extending rearward, an upper standing wall formed by bending upward from a rear end of the upper wall, a lower wall continuing from the lower ridgeline and extending rearward, and In a vehicle seat having a lower wall that is bent downward from the rear end of the lower wall, the side frame has a front wall that is bent inwardly from the front edge of the plate-shaped portion to form a curved region that extends vertically around the rotation axis to the upper frame, and a rear wall that is bent inwardly from the rear edge of the plate-shaped portion to form a curved region that extends vertically around the rotation axis to the upper frame, and the inner edge of the front wall has a protrusion that extends inward from an imaginary contour line that corresponds to the shape of the upper frame and is overlapped on the front wall from the rear.

[0007] According to a second aspect, in addition to the configuration of the first aspect, the front wall of the upper frame and the protruding piece of the side frame have weld marks.

[0008] According to a third aspect, in addition to the configuration of the first or second aspect, the vehicle seat includes an upper overlap piece that is continuous with the rear wall and overlaps the upper wall of the upper frame from the rear. .

[0009] According to a fourth aspect, in addition to the configuration of the third aspect, the upper standing wall of the upper frame and the upper overlapping piece of the side frame have weld marks.

[0010] According to a fifth aspect, in addition to the configurations of the first to fourth aspects, the vehicle seat includes a lower overlap piece that continues from the rear wall and is overlapped from behind on the lower standing wall of the upper frame.

[0011] According to a sixth aspect, in addition to the configuration of the fifth aspect, the lower standing wall of the upper frame and the lower overlapping piece of the side frame have weld marks.

[0012] According to a seventh aspect, in addition to the configuration of the sixth aspect, the lower overlapping piece has a lower flange that is bent forward from a lower end of the lower overlapping piece.

[0013] According to an eighth aspect, in addition to the configuration of the seventh aspect, the upper frame has a flange that is continuous with the lower end of the lower wall and is bent forward at a position corresponding to the lower flange in the horizontal direction.

[0014] According to a ninth aspect, in addition to the configuration of the eighth aspect, the vehicle seat includes a side frame flange that is bent and formed from an inner end of the rear wall and continues from the lower flange.

[0015] According to a tenth aspect, in addition to the configurations of the first to ninth aspects, the vehicle seat has a first support hole formed in the upper wall for receiving a headrest pillar guide that supports a headrest pillar so as to be freely displaceable in the axial direction, and a second support hole formed in the lower wall for receiving the headrest pillar guide, and support hole flanges that are folded downward are formed on the peripheries of the first support hole and the second support hole. Effect of the Invention

[0016] According to the first aspect, the rigidity of the plate-like portion of the side frame can be increased by the curved region formed by the front wall and rear wall. The side frame can be made lighter while still ensuring sufficient rigidity. Moreover, the upper frame can be assembled from the front to the left and right side frames that are spaced apart during assembly. At this time, the front wall of the side frame does not interfere with the upper standing wall and lower standing wall that are located rearward of the front wall of the upper frame. In this way, the work efficiency can be improved when assembling the upper frame.

[0017] According to the second aspect, since the upper frame and the side frame are overlapped and welded, the rigidity of the seat back frame can be increased.

[0018] According to a third aspect, the upper frame can be overlapped not only on the front wall of the side frame but also on the rear wall of the side frame. The upper overlap piece can contribute to improving the rigidity of the seat back frame.

[0019] According to the fourth aspect, since the upper frame is welded to the side frames at the rear wall in addition to the front wall, the rigidity of the seat back frame can be increased.

[0020] According to a fifth aspect, the upper frame can be overlapped not only on the front wall of the side frame but also on the rear wall of the side frame. The upper overlap piece can contribute to improving the rigidity of the seat back frame.

[0021] According to the fourth aspect, since the upper frame is welded to the side frames at the rear wall in addition to the front wall, the rigidity of the seat back frame can be increased.

[0022] According to the seventh aspect, the supporting rigidity of the upper frame relative to the side frame can be increased. The deformation of the seat frame can be suppressed. The back of an occupant sitting in the vehicle seat can be well supported.

[0023] According to the eighth aspect, the supporting rigidity of the upper frame relative to the side frame can be increased. The deformation of the seat frame can be suppressed. The back of an occupant sitting in the vehicle seat can be well supported.

[0024] According to the ninth aspect, since the lower flange of the lower overlap piece is continuous with the side frame flange of the rear wall, the rigidity of the lower overlap piece relative to the rear wall can be increased.

[0025] According to the tenth aspect, the rigidity of the upper upright wall and the lower upright wall can be ensured regardless of the formation of the first support hole and the second support hole. Moreover, since the support hole flanges are all bent downward, the headrest pillar guide can be smoothly inserted into the first support hole and the second support hole when the headrest pillar guide is assembled. [Brief description of the drawings]

[0026] [Figure 1] 1 is a perspective view showing a schematic overall configuration of a vehicle seat according to a first embodiment of the present invention; [Diagram 2] FIG. 2 is a perspective view showing a schematic structure of a seat frame. [Diagram 3] FIG. 2 is a perspective view showing a schematic configuration of a seat cushion pad and a seat back pad. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. 6 is an enlarged cross-sectional view taken along line 6-6 in FIG. 4. [Figure 7] FIG. 7 is an enlarged cross-sectional view taken along line 7-7 in FIG. [Figure 8] 10 is an enlarged perspective view showing a schematic view of a portion of a seat back frame assembled into a vehicle seat according to a second embodiment of the present invention. FIG. [Figure 9] 9 is an enlarged perspective view of the seat back frame observed from an angle different from that of FIG. 8. [Figure 10] FIG. 11 is an enlarged side view illustrating a schematic view of a portion of a seat back frame incorporated in a vehicle seat according to a third embodiment of the present invention. [Figure 11] FIG. 2 is an enlarged bottom view showing a schematic structure of the folding table. [Figure 12] FIG. 11 is an enlarged partial front view illustrating a support structure for a headrest pillar guide according to another embodiment of the present invention. [Figure 13] FIG. 13 is an enlarged cross-sectional view taken along line 13-13 in FIG. [Figure 14]13 is an enlarged partial front view illustrating a support structure for a headrest pillar guide according to still another embodiment of the present invention. FIG. [Figure 15] FIG. 15 is an enlarged cross-sectional view taken along line 15-15 in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, the terms "front / rear," "left / right," and "up / down" refer to directions as seen by an occupant seated in a normal seating position (basic position when driving) in a vehicle seat.

[0028] 1 is a schematic diagram showing an overall configuration of a vehicle seat according to a first embodiment of the present invention. The vehicle seat 11 includes, for example, a floor panel 12 which functions as one component of the monocoque structure of the vehicle. The seat cushion 14 is supported by the slide rail 13 so as to be movable in the front-rear direction and supports the buttocks and thighs of the occupant, a seat back 15 is connected to the seat cushion 14 so as to be swingable in the front-rear direction about a swing axis SX and supports the back of the occupant, and a headrest 16 is supported by the upper end of the seat back 15 and supports the head of the occupant. The seat cushion 14, the seat back 15 and the headrest 16 each have a covering material 14a, 15a, 16a that wraps the internal pad. The covering materials 15a, 16a are in close contact with the outer surface of the pad following the depression of the pad by the action of a hanging thread 17. The details of the pad will be described later. The vehicle seat 11 is configured for a left seat. When the vehicle seat 11 is used for a right seat, the left and right sides of the vehicle seat 11 may be interchanged.

[0029] The seat cushion 14 includes a side cover 18. A first switch 19a and a second switch 19b are attached to the side cover 18. The first switch 19a is formed as a knob that is long in the front-rear direction. When the first switch 19a is operated forward, the seat cushion 14 and the seat back 15 move forward. When the first switch 19a is operated rearward, the seat cushion 14 and the seat back 15 move rearward. When the first switch 19a is operated upward, the seat cushion 14 and the seat back 15 move upward. When the first switch 19a is operated downward, the seat cushion 14 and the seat back 15 move downward. The second switch 19b is formed as a knob that is long in the up-down direction. When the second switch 19b is operated forward, the seat back 15 swings forward about the swing axis SX. When the second switch 19b is operated rearward, the seat back 15 swings rearward about the swing axis SX.

[0030] The headrest 16 is fixed to a headrest pillar 21 that extends upward from the upper end of the seat back 15. The headrest pillar 21 is supported by the seat back 15 so as to be displaceable axially in the up and down direction. The height of the headrest 16 can be adjusted according to the displacement of the headrest pillar 21.

[0031] As shown in FIG. 2, the vehicle seat 11 includes a seat frame 23 that supports a pad. The seat frame 23 includes a seat cushion frame 24 that supports a pad of the seat cushion 14, a seat back frame 25 that is connected to the seat cushion frame 24 so as to be swingable about a swing axis SX and supports a pad of the seat back 15, and a base frame 26 that is guided by the slide rail 13 so as to be movable back and forth in the longitudinal direction and supports the seat cushion frame 24 on the slide rail 13. The seat cushion frame 24 is connected to the base frame 26 by a link mechanism 27. The link mechanism 27 includes a link member 28 having one end that is connected to the base frame 26 so as to be rotatable about a horizontal axis FH extending in the left-right direction, and the other end that is connected to the seat cushion frame 24 so as to be rotatable about a horizontal axis SH that extends in the left-right direction parallel to the horizontal axis FH. The link member 28 guides the up-down movement of the seat cushion frame 24 relative to the base frame 26 around the horizontal axis FH.

[0032] The seat cushion frame 24 includes cushion side frames 24a extending in parallel with the respective slide rails 13, a pan frame 24b connecting the cushion side frames 24a to each other at the front end of the seat cushion 14, and a connecting pipe 24c connecting the cushion side frames 24a to each other at the rear end of the seat cushion 14. A plurality of S springs (not shown) are disposed between the pan frame 24b and the connecting pipe 24c. Each S spring extends in the front-rear direction in a zigzag shape. The zigzag shape is formed by alternately combining wires extending in the front-rear direction and wires extending in the left-right direction.

[0033] An electric forward / backward movement device 29 is attached to the base frame 26. The electric forward / backward movement device 29 includes an electric motor 31 supported by the base frame 26. The electric motor 31 generates power in response to the supply of power. The power is supplied based on the operation of the first switch 19a. The power of the electric motor 31 causes the base frame 26 to move forward and backward along the slide rail 13.

[0034] An electric vertical movement device 32 is attached to the cushion side frame 24a of the seat cushion frame 24. The electric vertical movement device 32 includes an actuator 33 supported by the cushion side frame 24a and connected to the link mechanism 27. The actuator 33 includes an electric motor 34 disposed outside the cushion side frame 24a and generating power in response to the supply of electric power, and a transmission mechanism 35 that causes the link member 28 to rotate relative to the cushion side frame 24a around the horizontal axis SH in response to the power of the electric motor 34. The transmission mechanism 35 includes, for example, a drive gear fixed to the drive shaft of the electric motor 34 and a driven gear fixed to the link member 28 around the horizontal axis SH, and is configured of a group of gears that mesh with each other in sequence. Electric power is supplied based on the operation of the first switch 19a. The power of the electric motor 34 causes the cushion side frame 24a to move up and down around the horizontal axis FH.

[0035] A support shaft 36 is incorporated into the seat cushion frame 24 coaxially with the swing axis SX above and rearward of the connecting pipe 24c. The support shaft 36 is formed, for example, from a hollow metal tube. The metal tube has high rigidity in the axial direction. The support shaft 36 is sandwiched between the left and right cushion side frames 24a. The seat back frame 25 is supported by the support shaft 36.

[0036] The seat back frame 25 includes left and right side frames 38 connected to the inside of each cushion side frame 24a by a support shaft 36, and an upper frame 39 connecting the upper ends of the side frames 38 to each other above the support shaft 36. The side frame 38 has a plate-shaped portion 38a that spreads around the support shaft 36 along a vertical plane perpendicular to the swing axis SX and extends upward along the vertical plane, a front wall 38b that is continuous with the front edge of the plate-shaped portion 38a and bent inward to form a curved region 41 that extends vertically around the support shaft 36, and a rear wall 38c that is continuous with the rear edge of the plate-shaped portion 38a and bent inward to form a curved region 42 that extends vertically around the support shaft 36. The front wall 38b and the rear wall 38c are continuous around the support shaft 36. The rear wall 38c has a side frame flange 43 that is continuous with the inner end of the rear wall 38c and bent forward. Each side frame 38 is formed from, for example, a single metal plate. A headrest pillar guide 44 that supports the headrest pillar 21 so as to be vertically slidable is fixed to the upper frame 39. The upper frame 39 will be described in detail later.

[0037] An electric reclining device 45 is attached to the side frame 38 of the seatback frame 25. The electric reclining device 45 includes an actuator 46 attached to the side frame 38 of the seatback frame 25 around the swing axis SX. The actuator 46 is formed of an electric motor 47 that generates power in response to the supply of electric power, and a transmission mechanism 48 that converts the power of the electric motor 47 into driving force around the swing axis SX. The electric motor 47 generates power in response to the supply of electric power. The electric power is supplied based on the operation of the second switch 19b. The power of the electric motor 47 causes the seatback frame 25 to swing back and forth around the swing axis SX relative to the seat cushion frame 24.

[0038] 3, the seat cushion 14 further includes a seat cushion pad 49 supported by the seat cushion frame 24 and wrapped in a skin material 14a. The seat back 15 further includes a seat back pad 51 supported by the seat back frame 25 and wrapped in a skin material 15a. The seat cushion pad 49 and the seat back pad 51 are made of a resilient material such as urethane foam.

[0039] As shown in FIG. 4, the upper frame 39 is formed by bending a plate material. The front wall 54 is divided by an upper ridgeline 52 and a lower ridgeline 53 extending in the front direction, an upper wall 55 continuing from the upper ridgeline 52 and extending rearward, an upper wall 56 formed by bending upward from the rear end of the upper wall 55, a lower wall 57 continuing from the lower ridgeline 53 and extending rearward, and a lower wall 58 formed by bending downward from the rear end of the lower wall 57. The upper wall 56 has a first flange 61 continuing from the upper end of the upper wall 56 and bending forward. The first flange 61 continues horizontally along the upper edge of the upper wall 56 over the entire area. The lower wall 58 has a second flange 62 continuing from the lower end of the lower wall 58 and bending forward. The second flange 62 continues horizontally along the lower edge of the lower wall 58 over the entire area.

[0040] The front wall 54 is horizontally folded forward at two locations, left and right, to form a recess along a vertical valley fold line 63. The front wall 54 is further horizontally folded backward outside the recess to form a ridge line along a vertical mountain fold line 64. As the front wall 54 deforms, the upper standing wall 56 and the lower standing wall 58 deform in the same manner. The upper frame 39 is formed, for example, from a single metal plate.

[0041] A weld mark 65 is formed on the front wall 54 outside the mountain fold line 64 in the horizontal direction. Weld marks 66, 67 are formed on the upper upright wall 56 and the lower upright wall 58 corresponding to the top and bottom of the weld mark 65. The upper frame 39 is fixed to the left and right side frames 38 by the weld marks 65, 66, 67. Spot welding, arc welding, or laser welding can be used for welding.

[0042] In the side frame 38, the curved region 41 formed by the front wall 38b extends to the upper end of the side frame 38 and reaches the upper frame 39. The curved region 42 formed by the rear wall 38c extends to the upper end of the side frame 38 and reaches the upper frame 39. As shown in Fig. 5, the inner edge of the front wall 38b has a protrusion 69 that spreads inward from an imaginary contour line 68 corresponding to the edge of the upper frame 39 and is overlapped from the rear on the front wall 54 of the upper frame 39. A weld mark 65 is formed between the front wall 54 of the upper frame 39 and the protrusion 69.

[0043] The inner edge of the rear wall 38c has an upper overlapping piece 71 that continues from the rear wall 38c and is overlapped from the rear on the upper wall 56 of the upper frame 39, and a lower overlapping piece 72 that continues from the rear wall 38c below the upper overlapping piece 71 and is overlapped from the rear on the lower wall 58 of the upper frame 39, with a gap between them. A weld mark 66 is formed between the upper overlapping piece 71 and the upper overlapping piece 71. Similarly, a weld mark 67 is formed between the lower wall 58 of the upper frame 39 and the lower overlapping piece 72.

[0044] The upper overlapping piece 71 of the rear wall 38c has an upper flange 73 which is formed by bending forward from an upper edge of the upper overlapping piece 71. The upper flange 73 faces the first flange 61 of the upper frame 39 over a predetermined length from the left and right ends of the first flange 61. The lower overlapping piece 72 of the rear wall 38c has a lower flange 74 which is formed by bending forward from a lower edge of the lower overlapping piece 72. The lower flange 74 faces the second flange 62 of the upper frame 39 over a predetermined length from the left and right ends of the second flange 62. In this way, in the upper frame 39, the upper flange 73 is formed at a position corresponding to the first flange 61 in the horizontal direction, and the lower flange 74 is formed at a position corresponding to the second flange 62 in the horizontal direction.

[0045] As shown in FIG. 6 , the upper flange 73 is curved with a smaller curvature than the first flange 61. The first flange 61 can be fitted well inside the upper flange 73. Interference between the first flange 61 and the upper flange 73 can be avoided. The lower flange 74 is curved with a larger curvature than the second flange 62 at a position away downward from the second flange 62. The second flange 62 can be fitted well inside the lower flange 74. Interference between the second flange 62 and the lower flange 74 can be avoided. The side frame flange 43 is This continues from Lunge 74.

[0046] As shown in Fig. 7, the upper frame 39 has a first support hole 76 formed in the top wall 55 for receiving the headrest pillar guide 75, and a second support hole 77 formed in the bottom wall 57 for receiving the headrest pillar guide 75. The headrest pillar guide 75 supports the headrest pillar 21 so as to be displaceable in the axial direction. A positioning flange 78 that expands in a direction perpendicular to the axis is formed in the headrest pillar guide 75. When the headrest pillar guide 75 is inserted into the first support hole 76 and the second support hole 77 from above, the positioning flange 78 comes into contact with the top wall 55 from above to position the headrest pillar guide 75 in the axial direction. The headrest pillar guide 75 can be molded from a resin material, for example.

[0047] A support hole flange 79 is formed by bending downward around the periphery of each of the first support hole 76 and the second support hole 77. The headrest pillar guide 75 is press-fitted into the support hole flange 79. The support hole flange 79 fixes the headrest pillar guide 75 to the upper frame 39. The support hole flange 79 prevents the headrest pillar guide 75 from coming off the upper frame 39.

[0048] 8 is a schematic diagram showing a portion of a seatback frame 25a incorporated in a vehicle seat according to a second embodiment of the present invention. Like the seatback frame 25, the seatback frame 25a includes left and right side frames 38 connected to the insides of the respective cushion side frames 24a by support shafts 36, and an upper frame 81 connecting the upper ends of the side frames 38 to each other above the support shafts 36. Other than the upper frame 81, the configuration of the vehicle seat is the same as that of the vehicle seat 11 described above.

[0049] The upper frame 81 is formed by bending a plate material, and has a front wall 84 divided by an upper ridge line 82 and a lower ridge line 83 extending horizontally, an upper wall 85 continuing from the upper ridge line 82 and extending rearward, an upper wall 86 bending upward from the rear end of the upper wall 85, a lower wall 87 continuing from the lower ridge line 83 and extending rearward, and a lower wall 88 bending downward from the rear end of the lower wall 87. The upper wall 86 has a first flange 91 that is continuous from the upper end of the upper wall 86 and bending forward. The first flange 91 is continuous horizontally along the entire upper edge of the upper wall 86. The upper flange 73 of the side frame 38 faces the first flange 91 from the left and right ends of the first flange 91 of the upper frame 81 over a predetermined length. The lower wall 88 has a second flange 92 that is continuous from the lower end of the lower wall 88 and bending forward. The second flange 92 is continuous horizontally over the entire area along the lower edge of the lower standing wall 88. The lower flanges 74 of the side frames 38 face the second flanges 92 of the upper frame 81 over a predetermined length from the left and right ends of the second flanges 92.

[0050] The front wall 84 is horizontally folded forward at two locations, left and right, to form a recess along a vertical valley fold line 93. The front wall 84 is further horizontally folded backward outside the recess to form a ridge line along a vertical mountain fold line 94. As the front wall 84 deforms, the upper standing wall 86 and the lower standing wall 88 deform in the same manner. The upper frame 81 is formed, for example, from a single metal plate.

[0051] A weld mark 95 is formed on the front wall 84 outside the mountain fold line 94 in the horizontal direction. The weld mark 95 is formed between the front wall 84 of the upper frame 81 and the protruding piece 69 of the side frame 38. Weld marks 96, 97 are formed on the upper upright wall 86 and the lower upright wall 88 corresponding to the top and bottom of the weld mark 95. The upper frame 81 is fixed to the left and right side frames 38 by the weld marks 95, 96, 97. The upper upright wall 86 of the upper frame 81 is connected to the side frames 38 on both sides. A weld mark 96 is formed between the lower wall 88 of the upper frame 81 and the upper overlap piece 72. Similarly, a weld mark 97 is formed between the lower wall 88 of the upper frame 81 and the lower overlap piece 72.

[0052] A blower fan 101 of the seat ventilation system 99 is fixed to the lower wall 88 of the upper frame 81. The blower fan 101 includes a housing 102 that houses an impeller that rotates about a rotation axis Rx. The housing 102 is formed in a flat cylindrical shape coaxial with the rotation axis Rx, and has an intake port 103 that extends in a tangential direction of the circular outline. Two or more fixing pieces 104 that extend along a plane perpendicular to the rotation axis Rx are formed on the outer periphery of the housing 102. The fixing pieces 104 are superimposed on the surface of the lower wall 88. The fixing pieces 104 are connected to the lower wall 88 by screws 105 that are screwed into the lower wall 88. The screws 105 have an axis that is parallel to the rotation axis Rx.

[0053] 9, an air blower duct 106 is attached to the rear surface of the housing 102. The air blower duct 106 covers an opening formed in the rear wall of the housing 102, and receives an airflow generated in the axial direction of the rotation axis Rx by the rotation of the impeller. The seat ventilation system 99 includes a passage formed in the seat back pad 51 and connected to the air blower duct 106. The airflow is supplied from the passage in the seat back pad 51 to the back of an occupant leaning against the seat back 15.

[0054] The air blower duct 106 is formed with a mounting flange 106b that extends outward from a pipe 106a that guides the airflow and is overlapped with the rear surface of the housing 102 around the opening in the rear wall. A cutout 107 that matches the contour of the mounting flange 106b is formed in the lower wall 88 of the upper frame 81. The mounting flange 106b is received in the cutout 107. The rear surface of the housing 102 is in close contact with the surface of the lower wall 88 around the mounting flange 106b. The second flange 92 is discontinued at the cutout 107.

[0055] 10 is a schematic diagram showing a portion of a seatback frame 25b to be incorporated in a vehicle seat according to a third embodiment of the present invention. Like the seatback frame 25, the seatback frame 25b includes left and right side frames 38 connected to the insides of the respective cushion side frames 24a by support shafts 36, and an upper frame 111 connecting the upper ends of the side frames 38 to each other above the support shafts 36. The upper frame 111 has a similar structure to the upper frame 39. Except for the upper frame 111, the configuration of the vehicle seat is the same as that of the vehicle seat 11 described above.

[0056] A folding table 112 is attached to the front wall 54 of the upper frame 111. The table 112 includes a mounting body 113 fixed to the front wall 54, and a top plate 115 connected to the mounting body 113 by a wire frame 114 and displaceable between an operating position in which the table 112 spreads horizontally and a storage position in which the table 112 is stored along the back surface of the seat back 15. As shown in FIG. 11, the wire frame 114 is fixed to the underside of the top plate 115 and has a pair of left and right connecting wires 114a extending toward the mounting body 113, and an axial wire 114b bent from the tip of the connecting wire 114a and supported by the mounting body 113 so as to be rotatable coaxially with the axis line Wx. The mounting body 113 is formed with a cam piece 116 that rotatably supports the axial wire 114b and determines the trajectory of the connecting wire 114a when it rotates. The cam piece 116 has a protrusion 116a that elastically deforms the connecting wires 114a so that they approach each other when the connecting wires 114a are driven by an external force from the operating position to the storage position around the axis line Wx. The protrusion 116a restricts the movement of the connecting wires 114a around the axis line Wx, so that the top plate 115 can be held at the operating position or the storage position by the action of the protrusion 116a. The protrusion 116a generates an axial displacement of the axial wire 114b from the rotational movement of the connecting wire 114a around the axis line Wx.

[0057] As shown in FIG. 12, in the upper frame 39, a support tube 117 penetrating the upper wall 55 and the lower wall 57 may be inserted into the first support hole 118 and the second support hole 119 to support the headrest pillar guide 75. Here, small pieces 121, 122 are bent upward and downward from the periphery into the first support hole 118 and the second support hole 119, respectively. As shown in FIG. 13, each small piece 121, 122 is superimposed on the outer surface of the support tube 117. The small pieces 121, 122 are welded to the support tube 117. In this way, the support tube 117 is fixed to the upper frame 39. The welding can be performed from the front, similar to the welding of the upper frame 39 and the side frame 38, so that the work efficiency of assembling the seat frame 23 is improved. The headrest pillar guide 75 is press-fitted into the support tube 117. Similarly, in the upper frames 81, 111, a support tube 117 penetrating the upper wall 85 (55) and the lower wall 87 (57) may be inserted into the first support hole 118 and the second support hole 119 to support the headrest pillar guide 75.

[0058] Alternatively, as shown in FIG. 14, in the upper frame 39, a support tube 117 penetrating the upper wall 55 and the lower wall 57 may be inserted into the first support hole 118 and the second support hole 119 to support the headrest pillar guide 75. In this case, a recess 123 recessed toward the headrest pillar guide 75 is formed in the front wall 54. The recess 123 has a flat bottom plate 123a. As shown in FIG. 15, the bottom plate 123a of the recess 123 is overlapped on the outer surface of the support tube 117. The bottom plate 123a is welded to the support tube 117. In this way, the support tube 117 is fixed to the upper frame 39. The welding can be performed from the front, similar to the welding of the upper frame 39 and the side frame 38, and therefore the work efficiency of assembling the seat frame 23 is improved. The headrest pillar guide 75 is press-fitted into the support tube 117. Similarly, in the upper frames 81, 111, a support tube 117 penetrating the upper wall 85 (55) and the lower wall 87 (57) may be inserted into the first support hole 118 and the second support hole 119 to support the headrest pillar guide 75. [Explanation of symbols]

[0059] 11...vehicle seat, 21...headrest pillar, 25...seatback frame, 25a...seatback frame, 25b...seatback frame, 36...rotation shaft (support shaft), 38...side frame, 38a...plate-shaped portion, 38b...front wall, 38c...rear wall, 39...upper frame, 41...curved region (of front wall), 42...curved region (of rear wall), 43...side frame flange, 52...upper ridge, 53...lower ridge, 54...front wall, 55...upper wall, 56...upper wall, 57...lower wall, 58...lower wall, 62...flange (second flange), 65...weld mark (on front wall), 68...imaginary contour line, 69...projection piece, 75...headrest guide, 76...first support hole, 77...second support hole, 79...support hole flange, 81...upper frame, 82...upper ridge line, 83...lower ridge line, 84...front wall, 85...upper wall, 86...upper standing wall, 87...lower wall, 88...lower standing wall, 92...flange (second flange), 95...weld mark (on front wall), 111...upper frame, SX...rotation axis (swing axis) of side frame.

Claims

1. left and right side frames (38) each having a plate-like portion (38a) extending along a vertical plane perpendicular to the rotation axis (SX) around the rotation axis (36) and extending upward along the vertical plane; a seat back frame (25) having an upper frame (39; 81; 111) connecting the left and right side frames (38) above the rotation shaft (36), The upper frame (39; 81; 111) includes a front wall (54; 84) that is partitioned by an upper ridge line (52; 82) and a lower ridge line (53; 83) that extend horizontally; an upper wall (55; 85) extending rearward from the upper ridge line (52; 82); and an upper standing wall (56; 86) extending upward from the rear end of the upper wall (55; 85); A vehicle seat (11) having a lower wall (57; 87) continuing from the lower ridge line (53; 83) and extending rearward, and a lower standing wall (58; 88) extending downward from a rear end of the lower wall (57; 87), The side frame (38) includes a front wall (38b) that extends inwardly from a front edge of the plate-shaped portion (38a) and has a curved region (41) that extends vertically around the rotation shaft (36) and reaches the upper frame (39; 81; 111); a rear wall (38c) extending inwardly from the rear edge of the plate-shaped portion (38a) and having a curved region extending vertically around the rotation shaft (36) and reaching the upper frame (39; 81; 111); a lower overlapping piece (72) that is continuous with the rear wall (38c) and overlaps the lower standing wall (58; 88) of the upper frame (39; 81; 111) from the rear, The lower overlap piece (72) has a lower flange (74) extending forwardly from a lower end of the lower overlap piece (72); The upper frame (39; 81; 111) has a flange (62; 92) extending forward from the lower end of the lower standing wall (58; 88) at a position corresponding to the lower flange (74) in the horizontal direction, The flange (62; 92) is formed so that its left and right ends are directed upward relative to its center, and a lower weld mark (67; 97) is provided between the lower wall (57; 87) and the flange (62; 92).

2. In the vehicle seat according to claim 1, An upper overlap piece (71) is provided which is continuous with the rear wall (38c) and overlaps the upper standing wall (56; 86) of the upper frame (39; 81; 111) from the rear, The upper wall (56; 86) of the upper frame (39; 81; 111) and the upper overlap piece (71) of the side frame (38) have upper weld marks (66; 96), The upper weld mark (66; 96) is positioned lower than the upper wall in the vertical direction, and the lower weld mark (67; 97) is positioned outward from the upper weld mark (66; 96).

3. In the vehicle seat according to claim 2, The inner edge of the front wall (38b) has a protrusion (69) that spreads inward from an imaginary outline (68) corresponding to the shape of the upper frame (39; 81; 111) and is overlapped with the front wall (54; 84) from the rear, The front wall (54; 84) of the upper frame (39; 81; 111) and the protrusion (69) of the side frame (38) have a middle weld mark (65; 95) of welding, The upper weld mark (66; 96) is disposed above the middle weld mark (65; 95), The lower wall (58; 88) of the upper frame (39; 81; 111); The lower weld mark (67; 97) at the portion where the side frame (38) overlaps with the rear wall (38c) is disposed lower than the middle weld mark (65; 95), The middle weld mark (66; 96) is disposed above the lower weld mark (67; 97) in the vertical direction and below the upper weld mark (66; 96), The vehicle seat is characterized in that the middle weld mark (66; 96) is disposed outboard of the upper weld mark (66; 96).

4. The vehicle seat according to any one of claims 1 to 3, A vehicle seat comprising a side frame flange (43) extending from an inner end of the rear wall (38c) and continuing from the lower flange (74).

5. In the vehicle seat according to claim 3, The vehicle seat, wherein the upper weld mark (66; 96) and the lower weld mark (67; 97) are disposed on the same vertical plane when viewed from the front of the seat.

6. The vehicle seat according to any one of claims 1 to 5, a seat cushion (14) for supporting the buttocks and thighs of an occupant; and a seat back (15) for supporting the back of the occupant, the seat back (15) being connected to the seat cushion (14) so ​​as to be swingable in the front-rear direction around the rotation axis (SX); a headrest (16) supported on an upper end of the seat back (15) for receiving the head of an occupant; The headrest (16) is fixed to a headrest pillar (21) extending upward from the upper end of the seat back (15), a first support hole (76) formed in the upper wall (55; 85) for receiving a headrest pillar guide (75) for supporting the headrest pillar (21) in an axially displaceable manner; A second support hole (77) is formed in the lower wall (57; 87) and receives the headrest pillar guide (75). A vehicle seat, characterized in that a support hole flange (79) extending downward is formed on the peripheral edge of each of the first support hole (76) and the second support hole (77).

7. The vehicle seat according to claim 6, An upper overlap piece (71) is provided which is continuous with the rear wall (38c) and overlaps the upper standing wall (56; 86) of the upper frame (39; 81; 111) from the rear, The upper wall (56; 86) of the upper frame (39; 81; 111) and the upper overlap piece (71) of the side frame (38) have upper weld marks (66; 96), The vehicle seat is characterized in that the upper weld mark (66; 96) is disposed between the first support hole (76) and the second support hole (77) in the vertical direction.

8. The vehicle seat according to claim 6, The vehicle seat is characterized in that the lower weld mark (67; 97) is disposed lower than the second support hole (77) in the vertical direction.

9. The vehicle seat according to claim 6, The vehicle seat is characterized in that the lower weld mark (67; 97) is disposed lower than the headrest pillar guide (75) in the vertical direction.

10. The vehicle seat according to any one of claims 1 to 9, The vehicle seat (11) includes a slide rail (13) coupled to a floor panel (12) of the vehicle; a seat cushion (14) supported by the slide rail (13) so as to be movable in the front-rear direction and adapted to receive the buttocks and thighs of an occupant; the seat back (15) connected to the seat cushion (14) so ​​as to be pivotable in the front-rear direction around the rotation axis (SX) and supporting the back of an occupant; a headrest (16) supported on an upper end of the seat back (15) for receiving the head of an occupant; The seat cushion (14), the seat back (15) and the headrest (16) each have a covering material (14a, 15a, 16a) that encases an internal pad, The vehicle seat (11) includes a seat frame (23) that supports the pad, The seat frame (23) includes a seat cushion frame (24) that supports the pad of the seat cushion (14); a seat back frame (25) connected to the seat cushion frame (24) and supporting the pad of the seat back (15); a base frame (26) that supports the seat cushion frame (24) on the slide rail (13), An electric reclining device (45) is attached to the side frame (38) of the seat back frame (25) to cause the seat back frame (25) to rock back and forth around the rotation axis (SX) relative to the seat cushion frame (24); An electric forward / backward movement device (29) is attached to the base frame (26) to cause the base frame (26) to move forward / backward along the slide rail (13); An electric vertical movement device (32) is attached to the cushion side frame (24a) of the seat cushion frame (24), The vehicle seat is characterized in that the electric vertical movement device (32) causes the cushion side frame (24a) to move up and down around a horizontal axis (FH).

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