Seat frame and vehicle seat

Abstract

To provide a seat frame of a vehicle seat having a predetermined shape in which a reinforcement part having an appropriate shape is arranged and rigidity is improved.SOLUTION: A seat frame of a vehicle seat includes a back side frame 12 including: a side plate 12A; a front edge part 12B, a rear edge part, and a lower edge part 12D provided in a position crossing the side plate 12A; and a connection part 12E connecting the side plate 12A and each of the front edge part 12B, the rear edge part, and the lower edge part 12D. The front edge part 12B, the rear edge part, and the lower edge part 12D include a formation part having a predetermined shape. The formation part includes bending parts 40A, 41A, 42A having a curvature different from curvatures of other portions in the front edge part 12B, the rear edge part, and the lower edge part 12D.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a seat frame and a vehicle seat. [Background technology]

[0002] BACKGROUND ART In automotive parts made of plate material such as steel, it has been common to form concave or convex beads in order to improve the rigidity of the parts (see, for example, Patent Document 1).

[0003] Patent document 1 describes that in the seat back frame of a vehicle seat, the rigidity is increased by providing a concave or convex bead portion on the fixing portion of a lever bracket provided on the upper end side of the seat back that fixes it to the seat back frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6665727 Summary of the Invention [Problem to be solved by the invention]

[0005] The technology described in Patent Document 1 involves integrally forming a bead portion together with a plate portion by press working or the like in order to increase the rigidity of the mounting seat (fixing portion) of the bracket material. On the other hand, in the manufacture of seat frames for vehicle seats, the shape of the seat frame is more complex, so the above-mentioned techniques cannot be applied directly to the frame material that constitutes the seat frame. Therefore, there is a need for a technique that can arrange reinforcing parts of an appropriate shape for a predetermined seat frame shape.

[0006] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a seat frame for a vehicle seat having a predetermined shape, in which a reinforcing portion of an appropriate shape is arranged to improve rigidity. Another object of the present invention is to provide a vehicle seat having a seat frame with improved rigidity by arranging reinforcing portions of appropriate shapes. [Means for solving the problem]

[0007] The above-mentioned problem can be solved by the seat frame of the present invention, which is a seat frame for a vehicle seat, including a frame member having a first surface portion, a second surface portion provided at a position intersecting the first surface portion, and a connection portion connecting the first surface portion and the second surface portion, wherein the second surface portion has a formed portion having a predetermined shape, and the formed portion includes a curved portion having a curvature different from the curvature of a remaining portion of the second surface portion, The curved portion is When viewed from the front of the second surface portion The width of the second surface portion decreases toward the end portion opposite to the first surface portion. Approximately semicircular and a recessed shape in which the amount of recession from the surface of the second surface portion decreases toward the end of the second surface portion opposite to the first surface portion. This is solved by:

[0008] In this way, the second surface portion that intersects with the first surface portion of the seat frame has a formed portion that includes a curved portion having a curvature different from the curvature of the other parts of the second surface portion, so that the curved portion functions as a reinforcing portion, thereby improving the rigidity at the location where the two surfaces of the seat frame intersect.

[0009] At this time, The forming portion extends in the extension direction of the second surface portion, and a tip end portion of the forming portion in the extension direction is located closer to the first surface portion than a tip end portion of the second surface portion in the extension direction. It is preferable to have

[0010] Preferably, the forming portion has a concave shape when viewed from the front of the first surface portion.

[0011] It is also preferable that the connection portion has a second forming portion having a predetermined shape, and that the second forming portion has a protruding portion whose end on the first surface portion side protrudes beyond the surface of the first surface portion.

[0012] The connecting portion has a third forming portion having a predetermined shape, and the third forming portion has a concave bead. A plurality of the third forming portions are formed, and the forming portion is disposed so as to be sandwiched between the plurality of the third forming portions. It is preferable to have

[0013] Preferably, the first surface portion is provided with a concave bead portion.

[0014] In each of the above configurations, the protrusion, the concave bead, and the bead portion each function as a reinforcing portion, so that the rigidity of the seat frame is improved not only in the second surface portion but also in the connection portion and the first surface portion, thereby improving the rigidity of the entire seat frame.

[0015] Preferably, the frame member is a back side frame that constitutes a seat back of the vehicle seat, and the forming portion is provided above a reclining device of the vehicle seat. With this configuration, when a load equal to or greater than a predetermined value is applied during a rear-end collision of the vehicle, the back side frame buckles from the formed portion formed on the back side frame, thereby improving the safety of the seat occupant during a rear-end collision.

[0016] It is also preferable that the vehicle seat comprises any one of the seat frames described above, a padding material placed on the seat frame, and a skin material covering the seat frame and the padding material. This makes it possible to provide a vehicle seat equipped with a seat frame having improved rigidity by arranging a reinforcing portion of an appropriate shape. [Effects of the Invention]

[0017] According to the present invention, in a seat frame of a vehicle seat having a predetermined shape, a reinforcing portion having an appropriate shape can be arranged to improve rigidity. Furthermore, according to the present invention, the safety of seated occupants in the event of a rear-end collision can be improved. Furthermore, according to the present invention, it is possible to provide a vehicle seat equipped with a seat frame with improved rigidity. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view of the appearance of a vehicle seat according to an embodiment of the present invention; [Figure 2] FIG. 2 is a perspective view of a seat frame according to the embodiment. [Figure 3A] FIG. 2 is an outer side view of the back side frame. [Figure 3B] FIG. 2 is an inner side view of the back side frame. [Figure 3C] FIG. 2 is a front view of the back side frame. [Figure 3D] FIG. [Figure 4] FIG. [Figure 5] FIG. 2 is a bottom view of the back side frame. [Figure 6] FIG. 6 is a cross-sectional end view of the portion cut along line VI-VI in FIG. 4. [Figure 7] FIG. [Figure 8A] FIG. [Figure 8B] FIG. [Figure 9] 10 is an explanatory diagram showing the positional relationship between the forming portion and the reclining device. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] A vehicle seat S and a seat frame 1 according to an embodiment of the present invention will be described below with reference to FIGS. The vehicle seat S is a seat to be installed in an automobile, and the seat frame 1 forms the framework of the vehicle seat S. The embodiment described below is merely an example to facilitate understanding of the present invention, and is not intended to limit the present invention. In other words, the shapes, dimensions, arrangements, etc. of the components described below may be changed or improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof.

[0020] In the following description, "front-rear direction" means the front-rear direction as seen from the perspective of a person sitting in the vehicle seat, and is the direction that coincides with the direction of travel of the vehicle. "Right-left direction," "right side of the seat," and "left side of the seat" mean the left-right direction, right side, and left side as seen from the perspective of a person sitting in the vehicle seat. "Seat width direction" means the width direction of the vehicle seat, and coincides with the left-right direction as seen from the perspective of a person sitting in the vehicle seat. "Up-down direction" means the height direction of the vehicle seat, and coincides with the up-down direction when the vehicle seat is viewed from the front.

[0021] First, the overall configuration of a vehicle seat S and a seat frame 1 will be described with reference to FIGS. As shown in FIG. 1, a vehicle seat S includes a seat back S1, a seat cushion S2, and a headrest S3. The seat back S1 is a backrest portion that supports the back of a seated occupant from behind, and is configured by placing a padding material S1a on a seat back frame 10 that serves as a skeleton, and covering the seat back frame 10 and the padding material S1a with a skin material S1b. The seat cushion S2 is a seating portion that supports the seated occupant from below, and is configured by placing a padding material S2a on a seat cushion frame 20 that serves as a skeleton, and covering the seat cushion frame 20 and the padding material S2a with a skin material S2b. The headrest S3 is a head portion that supports the head of the seated occupant from behind, and is configured by covering a headrest frame (not shown) that serves as a core with a padding material S3a, and covering the headrest frame and the padding material S3a with a skin material S3b.

[0022] The seat frame 1 forms the skeleton of the vehicle seat S. 2, the seat frame 1 mainly includes a seat back frame 10 and a seat cushion frame 20. The seat back frame 10 forms the framework of the seat back S1, and the seat cushion frame 20 forms the framework of the seat cushion S2.

[0023] The seatback frame 10 has as its main components an inverted U-shaped upper frame 11, a pair of left and right backside frames 12 that form the ends of the seat widthwise, and a lower frame 13 that connects the lower ends of the pair of left and right backside frames 12.

[0024] The upper frame 11 extends in the seat width direction and has upper frame side portions 11A extending downward on both sides in the seat width direction, and is welded to the back side frame 12 at the upper frame side portions 11A. A headrest attachment portion 17 made of a tubular body is attached to the upper end of the upper frame 11 by welding. Two headrest stays S3c hanging down from the headrest S3 are inserted into the headrest attachment portion 17. In addition, a cross member 14 is installed above the upper frame side portions 11A of the upper frame 11.

[0025] A pressure-receiving member 15 that receives the load of the seated occupant and supports the back of the seated occupant is provided in the center of the seat back frame 10. The pressure-receiving member 15 is attached to the seat back frame 10 by two wires 15A extending in the vertical direction at its back surface, with the upper ends of the wires 15A being attached to the cross member 14 and the lower ends being attached to the lower frame 13. An airbag device 50 is attached to one of the left and right back side frames 12 on the outer surface in the seat width direction.

[0026] A reclining device 60 for adjusting the angle of the seat back frame 10 relative to the seat cushion frame 20 is provided at the lower end of the left and right back side frames 12, and the lower end of the seat back frame 10 is connected to the rear end of the seat cushion frame 20 via the reclining device 60 etc. A rotation shaft 61 of the reclining device 60 is attached between the lower end of the left and right back side frames 12 in a state where it passes through the left and right back side frames 12.

[0027] The seat cushion frame 20 has an outer shape that is roughly a rectangular frame when viewed from above. The seat cushion frame 20 mainly comprises a pan frame 21 that forms the front end of the seat cushion frame 20, a pair of left and right cushion side frames 22 that form the ends in the seat width direction, and a connecting member 23 that connects the rear ends of the left and right cushion side frames 22. The pan frame 21 is formed from a plate-like member, and the connecting member 23 is formed from a hollow member such as a round pipe.

[0028] A pressure-receiving member 25 that supports the buttocks of a seated person is provided in the center of the seat cushion frame 20. The front end of a wire 25A that supports the pressure-receiving member 25 is engaged with the pan frame 21, and the rear end is attached to the connecting member 23.

[0029] Next, the configuration of the back side frame 12 will be described with reference to FIGS. 3A to 3D. Fig. 3A is an outer side view of the backside frame 12 disposed on the right side of the vehicle seat S as seen by a seat occupant, Fig. 3B is an inner side view of the backside frame 12, Fig. 3C is a front view of the backside frame 12, and Fig. 3D is a rear view of the backside frame 12. Note that in the following explanation, the backside frame 12 disposed on the right side of the seat will be used as an example, but the backside frame 12 disposed on the left side of the seat also has similar characteristics except that it is bilaterally symmetrical.

[0030] The backside frame 12 is a frame member formed by pressing a metal plate and consisting of a curved plate body that is wider at the bottom than at the top. As shown in FIGS. 3A to 3D, the backside frame 12 has a substantially flat side plate 12A as a frame side portion, a front edge portion 12B formed by bending the front end of the side plate 12A inward to form a substantially U-shaped or L-shaped cross section, a rear edge portion 12C formed by bending the rear end inward to form a substantially L-shaped cross section, and a lower edge portion 12D formed by bending the lower end inward to form a substantially L-shaped cross section. The backside frame 12 further has connecting portions 12E between the side plate 12A and each of the front edge portion 12B, rear edge portion 12C, and lower edge portion 12D, which connect the side plate 12A to each edge portion (see FIGS. 4 and 5).

[0031] In other words, when the side plate 12A is defined as a first surface portion that forms a first surface (e.g., a side surface) of the backside frame 12, and the front edge portion 12B, the rear edge portion 12C, and the lower edge portion 12D are defined as second surfaces that form a second surface (e.g., the front surface, the rear surface, or the lower surface) of the backside frame 12, the first surface portion and the second surface portion are arranged to intersect with each other, and a connecting portion that connects the first surface portion and the second surface portion is provided between them, i.e., at the intersecting portion. In this way, the backside frame 12 is configured to have the first surface portion, the second surface portion provided at a position that intersects with the first surface portion, and the connecting portion that connects the first surface portion and the second surface portion.

[0032] The backside frame 12 is curved so that its width is wider at the bottom than at the top in a side view, and is also curved so that its width is widest at the center in the up-down direction. The part of the backside frame 12 where the width of the side plate 12A in the front-to-back direction is widest, i.e., the part where the end on the front edge portion 12B side bulges out most forward, is called the maximum bulge portion 12G.

[0033] The side plate 12A constituting the side of the backside frame 12 is provided with a concave bead portion 30 recessed toward the seat inside on the outer surface of the side plate 12A. The bead portion 30 functions as a reinforcing portion that reinforces the side plate 12A, thereby improving the rigidity of the backside frame 12. In this embodiment, the concave bead portion 30 is configured to include two vertically aligned beads that extend substantially parallel in the front-to-rear direction, a bead that connects one end of these two beads to each other and extends in the vertical direction, and a bead that extends downward from the other end of the lower bead.

[0034] Furthermore, the side plate 12A constituting the side of the backside frame 12 is formed with airbag mounting holes 31A and 31B for mounting the airbag device 50, and webbing mounting holes 32A and 32B for fixing webbing that guides the airbag deployment and controls the deployment direction. The airbag mounting holes 31A and 31B are substantially circular through-holes through which bolts extending from the airbag body are inserted. The webbing mounting holes 32A and 32B are substantially rectangular through-holes through which mounting members fixed to the ends of the webbing are inserted.

[0035] 3B, the airbag mounting hole 31A and the webbing mounting hole 32A are provided at the same position in the front-rear direction (overlapping in the up-down direction) as a curved portion 41A as a forming portion described later, i.e., on the same approximately vertical line. Also, the airbag mounting hole 31B and the webbing mounting hole 32B are provided at the same position in the front-rear direction (overlapping in the up-down direction) as a curved portion 42A as a forming portion described later, i.e., on the same approximately vertical line.

[0036] The rear edge 12C has a recess 33 formed on the rear surface thereof, recessed toward the front of the seat. The recess 33 functions as a reinforcing portion that reinforces the rear edge 12C. The recess 33 is a concave bead that extends in the vertical direction in this embodiment, with the bead width at the center of the recess 33 being wider than at the top and bottom.

[0037] Next, the forming portions provided on the back side frame 12 will be described with reference to FIGS. Figure 4 is a perspective view of the backside frame 12 arranged on the right side of the seat as seen by a seated occupant of the vehicle seat S, viewed from the lower right front side; Figure 5 is a bottom view of the backside frame 12; Figure 6 is an end view of the cross section taken along line VI-VI in Figure 4; Figure 7 is a partial perspective view of the backside frame 12 as seen from the lower right rear side; Figure 8A is a plan view of the curved portion as a forming portion; Figure 8B is a cross-sectional view of the curved portion; and Figure 9 is an explanatory diagram showing the positional relationship between the forming portion and the reclining device 60.

[0038] The back side frame 12 has a forming portion having a predetermined shape, which will be described below. The forming portion is formed into a predetermined shape by press working, and functions as a reinforcing portion, improving the rigidity of the back side frame.

[0039] 4 and 5, the front edge 12B of the backside frame 12 is bent inward at the bottom of the backside frame 12 to form a generally L-shaped cross section and intersects the side panel 12A at a generally right angle. Protrusions 40 and 41, which protrude further forward from the front edge 12B as second surfaces, are formed at two locations on the front edge 12B: specifically, slightly below the maximum bulge 12G of the backside frame 12 and near the boundary between the front edge 12B and the lower edge 12D. The front edge 12B includes these protrusions 40 and 41, and the protrusions 40 and 41 also correspond to second surfaces.

[0040] Curved portions 40A and 41A are formed as forming portions (first forming portions) on the surfaces, i.e., the front surfaces, of protrusions 40 and 41. Curved portions 40A and 41A are portions that are curved with a curvature different from the curvature of the surfaces that form the other parts of protrusions 40 and 41. 8A, curved portions 40A and 41A have a concave shape when viewed from the side plate 12A side, i.e., when viewed from the front of side plate 12A. Curved portions 40A and 41A, which are formed portions, are curved with a curvature different from that of other portions of protruding portions 40 and 41 (portions other than curved portions 40A and 41A). Furthermore, as shown in FIG. 8B, curved portions 40A and 41A also have a concave shape in cross section and are curved with a curvature different from that of other portions of protruding portions 40 and 41 (portions other than curved portions 40A and 41A).

[0041] The curved portions 40A and 41A are formed in a substantially semicircular shape when viewed from the front of the seat, that is, when the protruding portions 40 and 41A are viewed from the front. Note that although the shapes of the curved portions 40A and 41A viewed from the front are not shown in Fig. 4, a curved portion 42A, which will be described later, has a shape similar to that of the curved portions 40A and 41A, and as shown in Fig. 5, the curved portion 41A is formed in a substantially semicircular shape when viewed from the front (when viewed from below the seat).

[0042] Similarly, curved portions 42A and 43A are formed as forming portions at the lower edge 12D and rear edge 12C of the backside frame 12, respectively. As shown in Fig. 5, the lower edge 12D, which serves as a second surface, is bent inward to form a substantially L-shaped cross section, intersects the side plate 12A at a substantially right angle, and has a protruding portion 42 that protrudes forward. The protruding portion 42 also corresponds to the second surface. A curved portion 42A is formed on the surface, i.e., the lower surface, of the protruding portion 42.

[0043] 7, rear edge portion 12C serving as the second surface portion is bent inward to form a generally L-shaped cross section and intersects side plate 12A at a generally right angle. A curved portion 43A is formed on the surface, i.e., the rear surface, of rear edge portion 12C. Note that the shape, structure, and other characteristics of curved portions 42A and 43A are the same as those of curved portions 40A and 41A described above, and therefore will not be described here.

[0044] In this way, the front edge 12B, the rear edge 12C, and the lower edge 12D have curved portions with different curvatures. By providing curved portions on each edge that intersects with the side plate 12A, an uneven shape is formed in the bent portion. The curved portions 40A, 41A, 42A, and 43A function as reinforcing portions, improving the rigidity of the backside frame 12.

[0045] Furthermore, the connection portion 12E, which is provided between the side plate 12A and the rear edge portion 12C and connects the side plate 12A and the rear edge portion 12C, has a protruding protrusion 44 as a forming portion (second forming portion). Specifically, as shown in FIGS. 4 and 5 , the protrusion 44 is formed at the rear end of the side plate 12A, protruding outward in the seat width direction from the outer surface (side surface) of the side plate 12A. The protrusion 44 extends from the upper portion of the backside frame 12 to below the middle portion. The outer end of the protrusion 44 in the seat width direction protrudes beyond the outer surface of the side plate 12A. In other words, the end of the protrusion 44 formed at the connection portion 12E between the side plate 12A and the rear edge portion 12C, on the side plate 12A side, protrudes beyond the surface of the side plate 12A.

[0046] In this way, by providing the protruding portion 44 at the connection portion 12E between the side plate 12A and the rear edge portion 12C, an uneven shape is formed at the bent portion. This protruding portion 44 functions as a reinforcing portion, and the rigidity of the back side frame 12 is improved.

[0047] Furthermore, the front edge portion 12B of the back side frame 12 is folded inward from the upper portion to the middle portion of the back side frame 12 to form a generally U-shaped cross section, and intersects with the side plate 12A at an acute angle. Concave beads 45A and 45B (collectively referred to as beads 45) are formed as forming portions (third forming portions) at a connecting portion 12E provided between the side plate 12A and the front edge portion 12B.

[0048] 4 to 6, a step is formed from the front end of side plate 12A to connection 12E between side plate 12A and front edge 12B, with recessed beads 45A formed between the steps. Similarly, a step is formed from the front end of front edge 12B to connection 12E, with recessed beads 45B formed between the steps.

[0049] Similarly, recessed beads 45 are formed as forming portions (third forming portions) in the lower edge portion 12D and the rear edge portion 12C of the backside frame 12. As shown in Figures 5 and 7, a stepped portion is formed from the lower end of the side plate 12A to the connecting portion 12E between the side plate 12A and the lower edge portion 12D, and recessed beads 45 are formed between the steps. In addition, a stepped portion is formed from the rear end of the side plate 12A to the connecting portion 12E between the side plate 12A and the rear edge portion 12C, and recessed beads 45 are formed between the steps.

[0050] The bead 45 as a forming portion (third forming portion) is formed continuously from the upper end to the lower end of the front end of the backside frame 12, except for the portions where the curved portions 40A, 41A, and 42A are formed, and is further formed continuously from the lower end to the curved portion 43A at the rear end.

[0051] In this way, the connection portions 12E provided between the side plate 12A and each of the front edge portion 12B, rear edge portion 12C, and lower edge portion 12D have concave beads 45. By providing the concave beads 45 at the connection portions 12E that connect two intersecting surfaces, an uneven shape is formed in the bent portion. These beads 45 function as reinforcing portions, improving the rigidity of the backside frame 12.

[0052] As shown in FIG. 9 , the curved portion 43A formed on the rear edge portion 12C of the backside frame 12 is provided above the reclining device 60. More specifically, the curved portion 43A is provided on the rear edge portion 12C in a portion of the lower part of the backside frame 12 near the connection portion with the cushion side frame 22 and located above the reclining device 60. By providing the concave curved portion 43A in such a location, when a load of a predetermined magnitude or greater is applied during a rear-end collision of the vehicle, the backside frame 12 buckles from the curved portion 43A formed on the rear surface of the backside frame 12 as a starting point. This improves the safety of the seat occupant during a rear-end collision.

[0053] <Other embodiments> The shape, structure and arrangement of the forming portion are not limited to the above-mentioned embodiments, and other shapes may also be used. For example, it is preferable to provide a slit (notch) extending perpendicular to the extending direction at the end of the concave or convex bead (groove). With this configuration, in addition to the effect of improving rigidity by the bead as a forming portion, formability is also improved. Furthermore, a surface pressing process may be performed on the surface of the second surface portion near the connecting portion to form a formed portion having stepped irregularities on the second surface portion. This configuration also improves the rigidity of the seat frame.

[0054] In the above embodiment, a vehicle seat and its seat frame mounted in an automobile vehicle have been described, but the present invention is not limited to vehicle seats for automobiles. It can also be applied to vehicle seats and their seat frames mounted in vehicles other than automobiles, such as railroad cars, ships, and aircraft. [Explanation of symbols]

[0055] S vehicle seat S1 seat back S2 seat cushion S3 Headrest S1a, S2a, S3a pad material S1b,S2b,S3b Skin material S3c headrest stay 1 seat frame 10 Seat back frame 11 Upper frame 11A Upper frame side 12 Backside frame (frame member) 12A Side plate (first side) 12B Front edge (second surface) 12C Rear edge (second surface) 12D Lower edge (second surface) 12E connection 12G maximum bulge 13 Lower frame 14 Cross member 15 Pressure-receiving member 15A Wire 17 Headrest mounting part 20 Seat cushion frame 21 Pan Frame 22 Cushion side frame 23 Connecting member 25 Pressure-receiving member 25A Wire 30 Bead section 33 Recess 31A, 31B Airbag mounting holes 32A, 32B Webbing mounting holes 40,41,42 Projection part (second surface part) 40A, 41A, 42A, 43A: Curved portion (forming portion, first forming portion) 44 Projection part (forming part, second forming part) 45, 45A, 45B Bead (forming part, third forming part) 50 Airbag device 60 Reclining device 61 Rotation axis

Claims

1. A seat frame for a vehicle seat, a frame member having a first surface portion, a second surface portion provided at a position intersecting the first surface portion, and a connecting portion connecting the first surface portion and the second surface portion; the second surface portion has a formed portion having a predetermined shape, The formed portion includes a curved portion having a curvature different from the curvature of other portions of the second surface portion, and the curved portion has an approximately semicircular shape that narrows toward the end of the second surface portion opposite the first surface portion when viewed from the front of the second surface portion, and has a concave shape in which the amount of recession from the surface of the second surface portion becomes smaller toward the end of the second surface portion opposite the first surface portion.

2. the forming portion extends in an extending direction of the second surface portion, The seat frame according to claim 1 , wherein a tip end portion of the forming portion in the extending direction is located closer to the first surface portion than a tip end portion of the second surface portion in the extending direction.

3. The seat frame according to claim 1 or 2, wherein the forming portion has a concave shape when viewed from the front of the first surface portion.

4. the connecting portion has a second forming portion having a predetermined shape, The seat frame according to any one of claims 1 to 3, wherein the second forming portion has a protruding portion whose end on the first surface portion side protrudes beyond the surface of the first surface portion.

5. the connecting portion has a third forming portion having a predetermined shape, the third forming portion has a concave bead, The third forming portion is formed in plurality, The seat frame according to claim 1 , wherein the forming portion is disposed so as to be sandwiched between a plurality of the third forming portions.

6. 6. The seat frame according to claim 1, wherein the first surface portion is provided with a concave bead portion.

7. the frame member is a back side frame that constitutes a seat back of the vehicle seat, 7. The seat frame according to claim 1, wherein the forming portion is provided above a reclining device of the vehicle seat.

8. A seat frame according to any one of claims 1 to 7; a padding material placed on the seat frame; a cover material that covers the seat frame and the pad material.

Images