JP2021059181A - Vehicle seat - Google Patents

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

The present invention includes left and right side frames having a plate-like portion that extends along a vertical plane orthogonal to the axis of rotation around the axis of rotation and extends upward along the vertical plane, and left and right side frames above the axis of rotation. The present invention relates to a vehicle seat having a seat back frame having an upper frame to be connected.

Patent Document 1 discloses a vehicle seat including a seat back that is recliningly connected to a seat cushion. The seat back has left and right side frames extending vertically upward from the rotation axis to support the seat back pad, and an upper frame connecting the left and right side frames above the reclining rotation axis. The front and rear walls of the side frame cover the edges of the upper frame vertically over the entire area.

Japanese Unexamined Patent Publication No. 2018-162033

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 troublesome. Improvement of work efficiency is desired.

An object of the present invention is to provide a vehicle seat that can contribute to improvement of work efficiency in assembling a seat back frame.

According to the first aspect of the present invention, the left and right side frames having a plate-like portion extending along the vertical plane orthogonal to the rotation axis around the rotation axis and extending upward along the vertical plane, and the rotation shaft. A seat back frame having an upper frame for connecting the left and right side frames above the above is provided, and the upper frame is formed by bending from a plate material and is separated by a horizontally extending upper ridge line and a lower ridge line. An upper wall that extends continuously from the upper ridge line to the rear, an upper wall that is bent upward from the rear end of the upper wall, a lower wall that extends continuously from the lower ridge line to the rear, and a rear end of the lower wall. In a vehicle seat having a lower standing wall that is bent downward, the side frame is continuously bent inward from the front edge of the plate-shaped portion, extends vertically from around the rotation axis, and is the upper. A front wall that forms a curved region leading to the frame, and a rear wall that is continuously bent inward from the trailing edge of the plate-shaped portion and extends vertically from around the rotation axis to form a curved region leading to the upper frame. The inner edge of the front wall has a protrusion that extends inward from a virtual contour line corresponding to the shape of the upper frame and is overlapped with the front wall from the rear.

According to the second side surface, in addition to the configuration of the first side surface, the front wall of the upper frame and the protrusions of the side frame have welding marks of welding.

According to the third side surface, in addition to the configuration of the first or second side surface, the vehicle seat includes an upper stacking piece which is continuous from the rear wall and is overlapped with the upper wall of the upper frame from the rear.

According to the fourth side surface, in addition to the configuration of the third side surface, the upper wall of the upper frame and the upper overlapping piece of the side frame have welding marks of welding.

According to the fifth side surface, in addition to the configuration of the first to fourth side surfaces, the vehicle seat includes a lower stacking piece which is continuous from the rear wall and is overlapped with the lower standing wall of the upper frame from the rear.

According to the sixth side surface, in addition to the configuration of the fifth side surface, the lower standing wall of the upper frame and the lower overlapping piece of the side frame have welding marks of welding.

According to the seventh side surface, in addition to the configuration of the sixth side surface, the lower stacking piece has a lower flange that is bent forward from the lower end of the lower stacking piece.

According to the eighth side surface, in addition to the configuration of the seventh side surface, the upper frame has a flange that is horizontally bent forward from the lower end of the lower standing wall at a position corresponding to the lower flange. ..

According to the ninth side surface, in addition to the configuration of the eighth side surface, the vehicle seat includes a side frame flange that is bent and molded from the inner end of the rear wall and is continuous from the lower flange.

According to the tenth side surface, in addition to the configuration of the tenth side surface, the vehicle seat receives the headrest pillar guide formed on the upper wall and supporting the headrest pillar so as to be displaced in the axial direction. A support having a support hole and a second support hole formed in the lower wall and receiving the headrest pillar guide, and a support formed by bending downward on the periphery of the first support hole and the second support hole, respectively. A hole flange is formed.

According to the first side surface, in the side frame, the rigidity of the plate-shaped portion can be increased by the action of the curved region formed by the front wall and the rear wall. Sufficient rigidity can be ensured while the side frame is lightweight. Moreover, the upper frame can be assembled from the front to the left and right side frames arranged at intervals during assembly. At this time, the front wall of the side frame does not interfere with the upper and lower standing walls located behind the front wall in the upper frame. In this way, work efficiency can be improved when assembling the upper frame.

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

According to the third aspect, the upper frame can be stacked on the rear wall in addition to the front wall of the side frame. The upper stacking piece can contribute to the improvement of the rigidity of the seat back frame.

According to the fourth side surface, since the upper frame is welded to the side frame not only on the front wall but also on the rear wall, the rigidity of the seat back frame can be increased.

According to the fifth aspect, the upper frame can be stacked on the rear wall in addition to the front wall of the side frame. The upper stacking piece can contribute to the improvement of the rigidity of the seat back frame.

According to the fourth side surface, since the upper frame is welded to the side frame not only on the front wall but also on the rear wall, the rigidity of the seat back frame can be increased.

According to the seventh aspect, the support rigidity of the upper frame can be increased with respect to the side frame. Deformation of the seat frame can be suppressed. The back of the occupant sitting in the vehicle seat can be well supported.

According to the eighth side surface, the support rigidity of the upper frame can be increased with respect to the side frame. Deformation of the seat frame can be suppressed. The back of the occupant sitting in the vehicle seat can be well supported.

According to the ninth side surface, since the lower flange of the lower stacking piece is continuous from the side frame flange of the rear wall, the rigidity of the lower stacking piece with respect to the rear wall can be increased.

According to the tenth aspect, the rigidity of the upper standing wall and the lower standing 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 satisfactorily inserted into the first support hole and the second support hole when assembling the headrest pillar guide.

It is a perspective view which shows typically the whole structure of the vehicle seat which concerns on 1st Embodiment of this invention. It is a perspective view which shows the structure of a seat frame schematicly. It is a perspective view which shows the structure of the seat cushion pad and the seat back pad schematicly. It is an enlarged front view of the upper frame. It is an enlarged plan view of a side frame. It is an enlarged cross-sectional view along the line 6-6 of FIG. FIG. 5 is an enlarged cross-sectional view taken along the line 7-7 of FIG. It is an enlarged perspective view which shows roughly a part of the seat back frame incorporated in the vehicle seat which concerns on 2nd Embodiment of this invention. It is an enlarged perspective view of the seat back frame observed from the angle different from FIG. It is an enlarged side view which shows roughly a part of the seat back frame incorporated in the vehicle seat which concerns on 3rd Embodiment of this invention. It is an enlarged bottom view which shows the structure of the folding table schematicly. It is an enlarged part front view which shows roughly the support structure of the headrest pillar guide which concerns on other embodiment. It is an enlarged cross-sectional view along the line 13-13 of FIG. It is an enlarged part front view which shows roughly the support structure of the headrest pillar guide which concerns on still another embodiment. FIG. 6 is an enlarged cross-sectional view taken along the line 15-15 of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, front / rear, left / right, and up / down refer to the directions seen from the occupant seated in the vehicle seat in the normal sitting posture (basic posture during driving).

FIG. 1 schematically shows the overall configuration of a vehicle seat according to the first embodiment of the present invention. The vehicle seat 11 is supported by, for example, a slide rail 13 coupled to a floor panel 12 that functions as one component of the monocoque structure of the vehicle, and a slide rail 13 that can be moved in the front-rear direction, and holds the occupant's buttocks and thighs. The seat cushion 14 that receives the seat cushion 14 is connected to the seat cushion 14 so that it can swing in the front-rear direction around the swing axis SX, and is supported by the seat back 15 that receives the back of the occupant and the upper end of the seat back 15, and the head of the occupant. A headrest 16 for receiving the headrest 16 is provided. The seat cushion 14, the seat back 15, and the headrest 16 each have skin materials 14a, 15a, and 16a that individually wrap the inner pad. The skin materials 15a and 16a are brought into close contact with the outer surface of the pad following the recesses of the pad by the action of the hanging thread 17. Details of the pad will be described later. The vehicle seat 11 is configured for the left seat. When the vehicle seat 11 is used for the right seat, the left and right sides of the vehicle seat 11 may be exchanged.

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 by a long knob 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 by a long knob in the vertical direction. When the second switch 19b is operated forward, the seat back 15 swings forward around the swing axis SX. When the second switch 19b is operated backward, the seat back 15 swings backward around the swing axis SX.

The headrest 16 is fixed to the headrest pillar 21 extending 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 vertically displaceable in the axial direction. The height of the headrest 16 can be adjusted according to the displacement of the headrest pillar 21.

As shown in FIG. 2, the vehicle seat 11 includes a seat frame 23 that supports the pad. The seat frame 23 is connected to the seat cushion frame 24 that supports the pad of the seat cushion 14 and the seat cushion frame 24 that swings around the swing axis SX to support the 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 is rotatably attached to the seat cushion frame 24 at one end that is rotatably coupled to the base frame 26 around the horizontal axis FH extending in the left-right direction and around the horizontal axis SH extending in the left-right direction parallel to the horizontal axis FH. A link member 28 having a other end to be coupled is provided. The link member 28 guides the vertical movement of the seat cushion frame 24 with respect to the base frame 26 around the horizontal axis FH.

The seat cushion frame 24 includes a cushion side frame 24a extending side by side with each slide rail 13, a pan frame 24b connecting the cushion side frames 24a at the front end of the seat cushion 14, and a cushion side frame at the rear end of the seat cushion 14. It is provided with a connecting pipe 24c for connecting the 24a to each other. A plurality of S springs (not shown) are arranged between the pan frame 24b and the connecting pipe 24c. The individual S springs have a zigzag shape and extend back and forth. The zigzag shape is formed by alternately combining a wire rod extending in the front-rear direction and a wire rod extending in the left-right direction.

An electric front-rear moving device 29 is attached to the base frame 26. The electric front-rear moving device 29 includes an electric motor 31 supported by the base frame 26. The electric motor 31 generates power according to the supply of electric power. Electric 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 back and forth 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 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 is arranged outside the cushion side frame 24a with respect to the electric motor 34 that generates power according to the supply of electric power and the cushion side frame 24a around the horizontal axis SH according to the power of the electric motor 34. It includes a transmission mechanism 35 that causes the link member 28 to rotate. 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 composed of a group of gears that mesh with each other in order. 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.

In the seat cushion frame 24, a support shaft 36 is incorporated coaxially with the swing axis SX above and after the connecting pipe 24c. The support shaft 36 is formed from, for example, 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 on the support shaft 36.

The seat back frame 25 includes left and right side frames 38 that are connected to the inside of each cushion side frame 24a by a support shaft 36, and an upper frame 39 that connects the upper ends of the side frames 38 to each other above the support shaft 36. Be prepared. The side frame 38 extends along the vertical plane orthogonal to the swing axis SX around the support shaft 36, and extends upward along the vertical plane. The plate-shaped portion 38a and the plate-shaped portion 38a are continuously inside from the front edge of the plate-shaped portion 38a. The front wall 38b, which is bent in the direction to form a curved region 41 extending in the vertical direction from around the support shaft 36, and the plate-shaped portion 38a are continuously bent inward from the trailing edge, and are vertically bent from around the support shaft 36. It has a rear wall 38c that forms a curved region 42 extending to. 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 continuously bent forward from the inner end of the rear wall 38c. The individual side frames 38 are formed from, for example, one metal plate. A headrest pillar guide 44 that supports the headrest pillar 21 so as to be slidable in the vertical direction is fixed to the upper frame 39. Details of the upper frame 39 will be described later.

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

As shown in FIG. 3, the seat cushion 14 further includes a seat cushion pad 49 supported by the seat cushion frame 24 and wrapped in the skin material 14a. The seat back 15 further includes a seat back pad 51 supported by the seat back frame 25 and wrapped in the skin material 15a. The seat cushion pad 49 and the seat back pad 51 are formed of an elastic material such as urethane foam.

As shown in FIG. 4, the upper frame 39 is formed by bending from a plate material, and has a front wall 54 partitioned by an upper ridge line 52 and a lower ridge line 53 extending in the horizontal direction, and an upper wall extending rearward continuously from the upper ridge line 52. 55, an upper wall 56 that is bent upward from the rear end of the upper wall 55, a lower wall 57 that is continuous and extends rearward from the lower ridge line 53, and a lower wall that is bent downward from the rear end of the lower wall 57. It has a standing wall 58. The upper wall 56 has a first flange 61 that is continuously bent forward from the upper end of the upper wall 56. The first flange 61 is continuous over the entire area in the horizontal direction along the upper edge of the upper wall 56. The lower standing wall 58 has a second flange 62 that is continuously bent forward from the lower end of the lower standing wall 58. The second flange 62 extends horizontally over the entire area along the lower edge of the lower wall 58.

The front wall 54 is formed by bending forward at two positions on the left and right in the horizontal direction to form a recess along the valley fold line 63 in the vertical direction. The front wall 54 is formed by being further bent rearward on the outside of the recess in the horizontal direction to form a ridge line along the mountain fold line 64 in the vertical direction. As the front wall 54 is deformed, the upper wall 56 and the lower wall 58 are similarly deformed. The upper frame 39 is formed from, for example, one metal plate.

Weld marks 65 are established on the front wall 54 outside the mountain fold line 64 in the horizontal direction. Welding marks 66 and 67 are established on the upper standing wall 56 and the lower standing wall 58 corresponding to the upper and lower parts of the welding mark 65. The upper frame 39 is fixed to the left and right side frames 38 at the welding marks 65, 66, and 67. Spot welding, arc welding, and laser welding can be used for welding.

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 extends inward from the virtual contour line 68 corresponding to the edge of the upper frame 39 and overlaps the front wall 54 of the upper frame 39 from the rear. The front wall 54 of the upper frame 39 forms a weld mark 65 with the projecting piece 69.

The inner edge of the rear wall 38c is formed by the upper stacking piece 71 which is continuous from the rear wall 38c and is stacked on the upper wall 56 of the upper frame 39 from the rear, and below the upper stacking piece 71, at a distance from the upper stacking piece 71. It has a lower overlapping piece 72 that is continuous from the rear wall 38c and is overlapped with the lower wall 58 of the upper frame 39 from the rear. The upper wall 56 of the upper frame 39 forms a welding mark 66 with the upper overlapping piece 71. Similarly, the lower wall 58 of the upper frame 39 forms a weld mark 67 with the lower stack 72.

The upper stack 71 of the rear wall 38c has an upper flange 73 that is bent forward from the upper edge of the upper stack 71. The upper flange 73 faces the first flange 61 over a predetermined length from the left and right ends of the first flange 61 of the upper frame 39. The lower stack 72 of the rear wall 38c has a lower flange 74 that is bent forward from the lower edge of the lower stack 72. The lower flange 74 faces the second flange 62 from the left and right ends of the second flange 62 of the upper frame 39 over a predetermined length. 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.

As shown in FIG. 6, the upper flange 73 is curved with a curvature smaller than that of the first flange 61. The first flange 61 can fit 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 at a position downward from the second flange 62 with a curvature larger than that of the second flange 62. The second flange 62 can fit 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 continuous from the lower flange 74.

As shown in FIG. 7, the upper frame 39 is formed in a first support hole 76 formed in the upper wall 55 to receive the headrest pillar guide 75, and a second support hole 76 formed in the lower wall 57 to receive the headrest pillar guide 75. It has a support hole 77. The headrest pillar guide 75 supports the headrest pillar 21 so as to be displaced in the axial direction. The headrest pillar guide 75 is formed with a positioning flange 78 that extends in a direction orthogonal to the axis. 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 contacts the upper wall 55 from above to position the headrest pillar guide 75 in the axial direction. The headrest pillar guide 75 can be molded from, for example, a resin material.

Support hole flanges 79 that are bent downward are formed on the peripheral edges of the first support hole 76 and the second support hole 77, respectively. 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 can prevent the headrest pillar guide 75 from coming off from the upper frame 39.

FIG. 8 schematically shows a part of the seat back frame 25a incorporated in the vehicle seat according to the second embodiment of the present invention. Similar to the seat back frame 25, the seat back frame 25a has the left and right side frames 38 connected to the inside of each cushion side frame 24a by the support shaft 36, and the upper ends of the side frames 38 mutually above the support shaft 36. It is provided with an upper frame 81 for connecting the above. Except for the upper frame 81, the structure of the vehicle seat is the same as that of the vehicle seat 11 described above.

The upper frame 81 is formed by bending from a plate material, has a front wall 84 partitioned by an upper ridge line 82 and a lower ridge line 83 extending in the horizontal direction, an upper wall 85 continuously extending rearward from the upper ridge line 82, and a rear of the upper wall 85. It has an upper standing wall 86 that is bent upward from the end, a lower wall 87 that is continuous and extends rearward from the lower ridge line 83, and a lower standing wall 88 that is bent downward from the rear end of the lower wall 87. The upper wall 86 has a first flange 91 that is continuously bent forward from the upper end of the upper wall 86. The first flange 91 is continuous over the entire area in the horizontal direction along the upper edge of the upper wall 86. The upper flange 73 of the side frame 38 faces the first flange 91 over a predetermined length from the left and right ends of the first flange 91 of the upper frame 81. The lower standing wall 88 has a second flange 92 that is continuously bent forward from the lower end of the lower standing wall 88. The second flange 92 is horizontally continuous over the entire area along the lower edge of the lower wall 88. The lower flange 74 of the side frame 38 faces the second flange 92 from the left and right ends of the second flange 92 of the upper frame 81 over a predetermined length.

The front wall 84 is formed by bending forward at two positions on the left and right in the horizontal direction to form a recess along the valley fold line 93 in the vertical direction. The front wall 84 is further bent and formed rearward on the outside of the recess in the horizontal direction to form a ridge line along the mountain fold line 94 in the vertical direction. As the front wall 84 is deformed, the upper wall 86 and the lower wall 88 are similarly deformed. The upper frame 81 is formed from, for example, one metal plate.

Weld marks 95 are established on the front wall 84 outside the mountain fold line 94 in the horizontal direction. The front wall 84 of the upper frame 81 forms a weld mark 95 with the projecting piece 69 of the side frame 38. Welding marks 96 and 97 are established on the upper standing wall 86 and the lower standing wall 88 corresponding to the upper and lower parts of the welding mark 95. The upper frame 81 is fixed to the left and right side frames 38 at the welding marks 95, 96, and 97. The upper wall 86 of the upper frame 81 forms a welding mark 96 with the upper overlapping piece 71 of the side frame 38. Similarly, the lower wall 88 of the upper frame 81 forms a weld mark 97 with the lower stack 72.

The 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 around the rotation axis Rx. The housing 102 has an intake port 103 that is formed in a flat cylindrical shape coaxially with the rotation axis Rx and extends tangentially to a circular contour. Two or more fixed pieces 104 extending along a plane orthogonal to the rotation axis Rx are formed on the outer periphery of the housing 102. The fixing piece 104 is superposed on the surface of the lower wall 88. The fixing piece 104 is connected to the lower wall 88 by a screw 105 screwed into the lower wall 88. The screw 105 has an axis parallel to the rotation axis Rx.

As shown in FIG. 9, a ventilation duct 106 is attached to the rear surface of the housing 102. The air duct 106 closes the opening formed in the rear wall of the housing 102 and receives the 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 ventilation duct 106. Airflow is supplied from the aisle of the seat back pad 51 to the back of the occupant leaning against the seat back 15.

The air duct 106 is formed with a mounting flange 106b that extends outward from the pipe body 106a that guides the airflow and overlaps the rear surface of the housing 102 around the opening of the rear wall. The lower wall 88 of the upper frame 81 is formed with a notch 107 in the shape of the contour of the mounting flange 106b. The mounting flange 106b is accepted in the notch 107. Around the mounting flange 106b, the rear surface of the housing 102 is in close contact with the surface of the lower wall 88. The second flange 92 is interrupted at the notch 107.

FIG. 10 schematically shows a part of a seat back frame 25b incorporated in a vehicle seat according to a third embodiment of the present invention. Similar to the seat back frame 25, the seat back frame 25b has the left and right side frames 38 connected to the inside of the individual cushion side frames 24a by the support shaft 36, and the upper ends of the side frames 38 mutually above the support shaft 36. It is provided with an upper frame 111 for connecting the above frames. The upper frame 111 has a structure similar to that of the upper frame 39. Except for the upper frame 111, the structure of the vehicle seat is the same as that of the vehicle seat 11 described above.

A foldable table 112 is attached to the front wall 54 of the upper frame 111. The table 112 is connected between the mounting body 113 fixed to the front wall 54 and the storage position connected to the mounting body 113 by the wire frame 114 and spread horizontally and stored along the back surface of the seat back 15. A top plate 115 that is displaced is provided. As shown in FIG. 11, the wire frame 114 is fixed to the lower surface of the top plate 115, and is bent from a pair of left and right connecting wires 114a extending toward the mounting body 113 and the tip of the connecting wire 114a to form an axis. It has a shaft wire 114b that is coaxially rotatably attached to Wx and is supported by the body 113. The mounting body 113 is formed with a cam piece 116 that rotatably supports the shaft wire 114b and defines the trajectory of the connecting wire 114a during rotation. The cam piece 116 has a protrusion 116a that elastically deforms the connecting wire 114a so as to come close to each other when the connecting wire 114a is driven from the operating position to the storage position around the axis Wx by an external force. Since the protrusion 116a regulates the movement of the connecting wire 114a around the axis Wx, the top plate 115 can be held in the operating position or the storage position by the action of the protrusion 116a. The protrusion 116a produces an axial displacement of the axial wire 114b from the rotational movement of the connecting wire 114a around the axial Wx.

As shown in FIG. 12, in the upper frame 39, when supporting the headrest pillar guide 75, a support cylinder 117 penetrating the upper wall 55 and the lower wall 57 is inserted into the first support hole 118 and the second support hole 119. May be good. Here, small pieces 121 and 122 are bent upward and downward from the peripheral edge of the first support hole 118 and the second support hole 119, respectively. As shown in FIG. 13, the individual pieces 121, 122 are superposed on the outer surface of the support cylinder 117. The small pieces 121 and 122 are welded to the support cylinder 117. In this way, the support cylinder 117 is fixed to the upper frame 39. Since the welding can be performed from the front in the same manner as the welding of the upper frame 39 and the side frame 38, the work efficiency of assembling the seat frame 23 is improved. The headrest pillar guide 75 is press-fitted into the support cylinder 117. Similarly, in the upper frames 81 and 111, when supporting the headrest pillar guide 75, the support cylinder 117 penetrating the upper wall 85 (55) and the lower wall 87 (57) is provided in the first support hole 118 and the second support hole 119. It may be plugged in.

In addition, as shown in FIG. 14, in the upper frame 39, when supporting the headrest pillar guide 75, a support cylinder 117 penetrating the upper wall 55 and the lower wall 57 is inserted into the first support hole 118 and the second support hole 119. It may be. Here, a recess 123 that is recessed toward the headrest pillar guide 75 is formed on 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 with the outer surface of the support cylinder 117. The bottom plate 123a is welded to the support cylinder 117. In this way, the support cylinder 117 is fixed to the upper frame 39. Since the welding can be performed from the front in the same manner as the welding of the upper frame 39 and the side frame 38, the work efficiency of assembling the seat frame 23 is improved. The headrest pillar guide 75 is press-fitted into the support cylinder 117. Similarly, in the upper frames 81 and 111, when supporting the headrest pillar guide 75, the support cylinder 117 penetrating the upper wall 85 (55) and the lower wall 87 (57) is provided in the first support hole 118 and the second support hole 119. It may be plugged in.

11 ... Vehicle seat, 21 ... Headrest pillar, 25 ... Seat back frame, 25a ... Seat back frame, 25b ... Seat back frame, 36 ... Rotating shaft (support shaft), 38 ... Side frame, 38a ... Plate-shaped part, 38b ... front wall, 38c ... rear wall, 39 ... upper frame, 41 ... curved area (of front wall), 42 ... curved area (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 ... welding marks (on the front wall), 68 ... virtual contour Line, 69 ... Projection piece, 75 ... Headrest guide, 76 ... 1st support hole, 77 ... 2nd 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 wall, 87 ... Lower wall, 88 ... Lower wall, 92 ... Flange (second flange), 95 ... Weld marks (on the front wall), 111 ... Upper frame, SX ... Side frame rotation axis (swing axis).

Claims (10)

Left and right side frames (38) having a plate-like portion (38a) extending around the axis of rotation (36) along a vertical plane orthogonal to the axis of rotation (SX) 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 axis (36) is provided.
The upper frame (39; 81; 111) is formed by bending from a plate material, and has a front wall (54; 84) separated by an upper ridge line (52; 82) and a lower ridge line (53; 83) extending in the horizontal direction.
An upper wall (55; 85) that is continuous from the upper ridge line (52; 82) and extends rearward, and an upper wall (56; 86) that is bent upward from the rear end of the upper wall (55; 85). ,
A lower wall (57; 87) that is continuous from the lower ridge line (53; 83) and extends rearward, and a lower wall (58; 88) that is bent downward from the rear end of the lower wall (57; 87). In the vehicle seat (11) having
The side frame (38) is continuously bent inward from the front edge of the plate-shaped portion (38a) and extends vertically from around the rotation axis (36) to the upper frame (39; 81; 111). The front wall (38b) forming the curved region (41) leading to
After being continuously bent inward from the trailing edge of the plate-shaped portion (38a) to form a curved region extending vertically from around the rotation axis (36) to the upper frame (39; 81; 111). With a wall (38c)
The inner edge of the front wall (38b) extends inward from the virtual contour line (68) corresponding to the shape of the upper frame (39; 81; 111) and is overlapped with the front wall (54; 84) from the rear. A vehicle seat characterized by having a piece (69). In the vehicle seat according to claim 1, the front wall (54; 84) of the upper frame (39; 81; 111) and the protrusion (69) of the side frame (38) are weld marks (69) of welding. A vehicle seat comprising 65; 95). In the vehicle seat according to claim 1 or 2, an upper stacking piece continuous from the rear wall (38c) and superposed on the upper wall (56; 86) of the upper frame (39; 81; 111) from the rear. A vehicle seat comprising (71). In the vehicle seat according to claim 3, the upper wall (56; 86) of the upper frame (39; 81; 111) and the upper overlapping piece (71) of the side frame (38) are welded together. A vehicle seat characterized by having marks (66, 96). In the vehicle seat according to any one of claims 1 to 4, the lower wall (58; 88) of the upper frame (39; 81; 111) is continuously connected to the rear wall (38c) and from the rear. A vehicle seat characterized by having a stackable lower stack (72). In the vehicle seat according to claim 5, the lower wall (58; 88) of the upper frame (39; 81; 111) and the lower stack (72) of the side frame (38) are welded. A vehicle seat characterized by having welding marks (67; 97). In the vehicle seat according to claim 6, the lower stacking piece (72) has a lower flange (74) that is bent forward from the lower end of the lower stacking piece (72). Vehicle seat. In the vehicle seat according to claim 7, the upper frame (39; 81; 111) is continuous from the lower end of the lower standing wall (58; 88) at a position corresponding to the lower flange (74) in the horizontal direction. A vehicle seat characterized by having a flange (62; 92) that is bent forward. The vehicle seat according to claim 8, further comprising a side frame flange (43) that is bent and molded from the inner end of the rear wall (38c) and is continuous from the lower flange (74). In the vehicle seat according to any one of claims 1 to 9,
A first support hole (76) formed in the upper wall (55; 85) and receiving a headrest pillar guide (75) that supports the headrest pillar (21) so as to be displaced in the axial direction.
It has a second support hole (77) formed in the lower wall (57; 87) and receives the headrest pillar guide (75).
A vehicle seat characterized in that support hole flanges (79) that are bent downward are formed on the peripheral edges of the first support hole (76) and the second support hole (77), respectively.

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