Seat frame

Abstract

To provide a seat frame with enhanced rigidity of a side frame.SOLUTION: A seat frame 1 includes side frames 12 disposed at the left and right sides. The seat frame 1 has first reinforcement parts 30A, each of which extends in a vertical direction along a rear edge 12C of a side frame side part 12A positioned at the seat width direction outer side in the side frame 12. The seat frame 1 has second reinforcement parts 30B, each of which is provided at the side frame side part 12A and extends in a seat fore and aft direction. The second reinforcement part 30B is provided in a vertical range in which the first reinforcement part 30A extends. The seat frame 1 has third reinforcement parts 30C, each of which is provided at the side frame side part 12A and extends in the fore and aft direction at a position separated from the second reinforcement part 30B in a downward direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a seat frame including a side frame. [Background technology]

[0002] There is a demand for weight reduction in seat frames that form the framework of seats installed in vehicles such as automobiles. For example, in Patent Document 1 listed below, the weight of the frame is reduced by using thin plate-shaped frames for the side frames that form the sides of the seat frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-67168 Summary of the Invention [Problem to be solved by the invention]

[0004] On the other hand, various components such as airbags and armrests may be attached to the side frames. In such cases, as disclosed in the above-mentioned prior art, plate-shaped frames with enlarged side surfaces may be used. In such plate-shaped frames with enlarged side surfaces, ensuring rigidity becomes an issue. Furthermore, holes may be formed in the side frames for attaching the various components described above, and forming a large number of such holes in a plate-shaped side frame may reduce the rigidity of the side frame. As described above, improving the rigidity of the side frames in the seat frame is an issue to be addressed.

[0005] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a seat frame with improved rigidity of the side frames. [Means for solving the problem]

[0006] The above-mentioned problems are solved by the seat frame of the present invention, which is a seat frame having side frames arranged on the left and right, and which has a first reinforcing portion extending in the vertical direction along the rear edge of the side frame side portion located on the outer side in the seat width direction of the side frames. According to the seat frame described above, the rear edges of the side frame sides are reinforced, thereby improving the rigidity of the side frames.

[0007] In the seat frame, the first reinforcing portion may be provided at least in a wide portion of the side frame lateral portion that is widest in the seat front-rear direction. This reinforces the wide portions of the side frames, thereby improving the rigidity of the side frames.

[0008] Furthermore, the seat frame may have a second reinforcing portion provided on a side portion of the side frame and extending in the fore-and-aft direction of the seat, and the second reinforcing portion may be provided within the upper and lower range in which the first reinforcing portion extends. This reinforces the side portions of the side frames in the vertical and longitudinal directions, thereby improving the rigidity of the side frames.

[0009] In the above seat frame, the first reinforcing portion and the second reinforcing portion may be connected to each other. This allows the first reinforcing portion and the second reinforcing portion to be integrally formed, which makes it easier to form the reinforcing portions.

[0010] The seat frame may further include a third reinforcing portion provided on a lateral portion of the side frame and extending in the front-rear direction at a position spaced downward from the second reinforcing portion. This makes it possible to improve the rigidity of the side frame side portions over a wide range.

[0011] In addition, in the above-mentioned seat frame, the second reinforcing portion may be connected between the upper and lower ends of the first reinforcing portion, and the third reinforcing portion may be connected to the lower end of the first reinforcing portion. This allows the rigidity of the side frame sides to be improved in a well-balanced manner.

[0012] In the above-described seat frame, the second reinforcing portion and the third reinforcing portion may extend at different angles relative to the first reinforcing portion. This improves the rigidity against load input from various angles.

[0013] In the above seat frame, the second reinforcing portion may extend in a direction substantially perpendicular to a torso line. This makes it possible to improve rigidity in the direction in which the load is large.

[0014] In the above-described seat frame, the second reinforcing portion may extend between a plurality of through holes formed in the side frame lateral portion. This can improve the rigidity around the through hole.

[0015] In addition, in the above-mentioned seat frame, the plurality of through holes may include an airbag mounting hole for mounting an airbag, and the second reinforcing portion and the third reinforcing portion may be provided at positions sandwiching the airbag mounting hole from above and below. This improves the rigidity of the portion of the side frame where the airbag is attached.

[0016] In the above-described seat frame, the first reinforcing portion may be located at a position facing at least one of the plurality of through holes in the up-down direction. This improves the rigidity of the area around the through-hole of the side frame.

[0017] Furthermore, the above-mentioned seat frame may include an upper frame that connects the upper portions of the side frames, the side frame side portions being joined to the upper frame side portions that are located on the outer side of the upper frame in the seat width direction, and the first reinforcing portion may be provided at least at a position where the side frame side portions and the upper frame side portions overlap. This improves the rigidity of the joint between the side frame and the upper frame. [Effects of the Invention]

[0018] According to the present invention, the rigidity of the side frame can be improved by reinforcing the rear edge of the side frame side portion. According to one aspect of the present invention, the rigidity of the side frame can be improved by reinforcing the wide portion at the side of the side frame. According to one aspect of the present invention, the side portions of the side frames are reinforced in the up-down direction and the front-rear direction, thereby improving the rigidity of the side frames. According to one aspect of the present invention, the reinforcing portion can be easily formed. According to one aspect of the present invention, the rigidity of the side portion of the side frame can be improved over a wide range. According to one aspect of the present invention, the rigidity of the side portions of the side frame can be improved in a well-balanced manner. According to one aspect of the present invention, it is possible to improve rigidity against input of loads from various angles. According to one aspect of the present invention, it is possible to improve rigidity in a direction in which a large load is input. According to one aspect of the present invention, the rigidity around the through hole can be improved. According to one aspect of the present invention, the rigidity of the portion of the side frame where the airbag is attached can be improved. According to one aspect of the present invention, the rigidity of the periphery of the through-hole of the side frame can be improved. According to one aspect of the present invention, the rigidity of the joint between the side frame and the upper frame can be improved. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 2 is a perspective view of a seat frame according to the embodiment. [Figure 2] FIG. [Figure 3A] FIG. [Figure 3B] FIG. [Figure 3C] FIG. [Figure 4] 4 is a partially enlarged view of the periphery of the second connecting bracket taken from viewpoint IV in FIG. 1. FIG. [Figure 5A] FIG. 10 is an outer side view of the first connecting bracket. [Figure 5B] FIG. 10 is a rear view of the first connecting bracket. [Figure 5C] FIG. 10 is an inner side view of the first connecting bracket. [Figure 6A] FIG. 10 is an outer side view of the second connecting bracket. [Figure 6B] FIG. 10 is a rear view of the second connecting bracket. [Figure 6C] FIG. 10 is an inner side view of the second connecting bracket. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] 9 is a cross-sectional view taken along line IX-IX in FIG. 7. [Figure 10] 8 is a cross-sectional view taken along the line XX in FIG. 7. [Figure 11] FIG. 8 is a partial enlarged view taken from viewpoint XI in FIG. 7. [Figure 12A] 10A and 10B are diagrams showing modified examples of reinforcing portions provided on the side frames. [Figure 12B] 10A and 10B are diagrams showing modified examples of reinforcing portions provided on the side frames. [Figure 12C] 10A and 10B are diagrams showing modified examples of reinforcing portions provided on the side frames. [Figure 12D]10A and 10B are diagrams showing modified examples of reinforcing portions provided on the side frames. [Figure 13] FIG. 10 is a view showing an upper part of a seat frame according to a second embodiment. [Figure 14] 14 is a cross-sectional view taken along the line XIV-XIV in FIG. 13. [Figure 15] 15 is a cross-sectional view taken along the line XV-XV in FIG. 13. [Figure 16] 16 is a cross-sectional view taken along line XVI-XVI of FIG. 13. [Figure 17] 17 is a cross-sectional view taken along the line XVII-XVII in FIG. 13. [Figure 18] 10 is a view showing a state in which a blower and a locking member are attached to a seat back frame according to a second embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] A seat frame 1 according to an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below with reference to Figures 1 to 18. The seat frame 1 forms the framework of a vehicle seat to be mounted in a vehicle. 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.

[0021] In the following description, the term "front-rear direction" refers to the front-rear direction as seen by a person seated in a vehicle seat, and is the direction that coincides with the direction in which the vehicle is traveling. The "seat width direction" means the lateral width direction of the vehicle seat, which coincides with the left-right direction when viewed from the seated person in the vehicle seat. Furthermore, the "vertical direction" refers to the height direction of the vehicle seat, and coincides with the vertical direction when the vehicle seat is viewed from the front.

[0022] [1. Overview of seat frame 1] First, an outline of the configuration of the seat frame 1 will be described with reference to Fig. 1. As shown in Fig. 1, the seat frame 1 is mainly composed of a seat back frame 10 and a seat cushion frame 20. The seat back frame 10 forms the framework of the backrest portion of the seat frame 1, and the seat cushion frame 20 forms the framework of the sitting portion of the seat frame 1.

[0023] As shown in Figure 1, the seatback frame 10 comprises an inverted U-shaped upper frame 11, a pair of side frames 12 that form the left and right ends of the seat width direction, and a lower frame 13 that connects the lower ends of the pair of side frames 12.

[0024] The upper frame 11 is welded to the side frames 12 at upper frame side portions 11A that form the lower portions on both sides of the upper frame 11. A headrest attachment portion 17 is attached by welding to the upper end of the upper frame 11. The headrest attachment portion 17 is a tubular body through which two headrest stays hanging down from a headrest (not shown) are inserted.

[0025] Cross members 14 are installed at both ends of the upper frame 11 above the upper frame side portions 11A. The left and right end portions 14B of the cross member 14 are welded and fixed to the left and right bent portions of the upper frame 11. The bent portions of the upper frame 11 are portions that connect the portion of the upper frame 11 where the headrest mounting portion 17 is attached and the portion where the side frame 12 is attached. If weight reduction is desired, a recess 14A recessed above the seat is formed between the left and right end portions 14B of the cross member 14. Specifically, the recess 14A is formed in the center of the cross member 14 in the seat width direction. In other words, the recess 14A is provided between the left and right headrest mounting portions 17. In this manner, in the seat frame 1, by forming the recess 14A in the cross member 14, the weight of the seat frame 1 is reduced. Although the recess 14A is formed at the lower end of the cross member 14, it may also be formed at the upper end. If the recess 14A is formed at the upper end, the recess 14A will be a portion recessed below the seat. Furthermore, the recess 14A may also be formed at both the upper and lower ends of the cross member 14.

[0026] As shown in FIG. 1, a rotation shaft 16 of a reclining unit 40 is attached between the lower ends of the left and right side frames 12 in a state where it penetrates the left and right side frames 12 . The angle of the seat back frame 10 relative to the seat cushion frame 20 can be adjusted by operating the reclining operation portion to operate the reclining unit 40.

[0027] A pressure-receiving member 15 that receives the load from an occupant is installed in the center of the seat back frame 10. The pressure-receiving member 15 includes a support portion 15A, a wire 15B, and a wire 15C. The support portion 15A supports the back of the occupant and is made of an elastic member such as a leaf spring, an S-spring, etc. The surface of the support portion 15A facing the front of the seat is referred to as the support surface. The wire 15B is secured to the support portion 15A and the front wall portion 13B of the lower frame 13. Specifically, the wire 15B is secured to the front wall portion 13B of the lower frame 13 using a clip 50 that fits into a through-hole formed in the front wall portion 13B. The wire 15C is anchored to the side end of the support portion 15A and the side frame 12, respectively. In this way, the support portion 15A is fixed to the seat back frame 10 by the wires 15B and 15C.

[0028] Next, the seat cushion frame 20 will be described. As shown in Fig. 1, the seat cushion frame 20 has a rectangular frame-like external shape when viewed from above. The seat cushion frame 20 mainly includes cushion side frames 22A, 22B located at the left and right ends in the seat width direction, a pan frame 21 that forms the front end of the seat cushion frame 20, and a connecting pipe 23 that connects the left and right cushion side frames 22A, 22B. For example, the connecting pipe 23 is a hollow member such as a round pipe, to which the rear end of a pressure-receiving member 24 that supports the buttocks of the occupant is attached.

[0029] 1, a first connecting bracket 18 is attached to the upper rear end of the left cushion side frame 22A. The left side frame 12 is connected to the first connecting bracket 18 via a reclining unit 40. 4, a second connecting bracket 19 is attached to the upper rear end of the right cushion side frame 22B. The right side frame 12 is connected to the second connecting bracket 19 via a reclining unit 40. The configurations of the first connecting bracket 18 and the second connecting bracket 19 will be described in detail later.

[0030] [2. Configuration of side frame 12] Next, the configuration of the side frame 12 will be described with reference to FIGS. 2, 3A, 3B, and 3C. Fig. 2 is a left side view of the seat back frame 10. Fig. 3A is an outer side view of the side frame 12, Fig. 3B is a rear view of the side frame 12, and Fig. 3C is an inner side view of the side frame 12.

[0031] As shown in Figures 2, 3A, and 3C, a side frame side portion 12A that constitutes the side portion of the side frame 12 is formed with a plurality of through holes including an airbag mounting hole 31A, an airbag mounting hole 31B, an airbag mounting hole 31C, and a through hole 31D. The airbag mounting holes 31A, 31B, and 31C are through-holes used to mount an airbag unit. Here, the airbag unit includes an airbag body, a webbing that guides the airbag in the deployment direction, an airbag mounting plate, etc. For example, the airbag mounting holes 31B and 31C are holes for mounting the webbing of the airbag, and the airbag mounting hole 31A is a hole through which a bolt extending from a retainer of the airbag body is inserted. The through-hole 31D is formed at a position facing the lower end of the upper frame side portion 11A, and the side frame 12 and the upper frame 11 are welded to each other at the through-hole 31D.

[0032] 2, 3A, and 3C, a first reinforcing portion 30A extending along a rear edge 12C is formed on a side frame side portion 12A that constitutes a side portion of the side frame 12. The rear edge 12C is a bent portion that corresponds to the boundary between the side frame side portion 12A that constitutes the side surface of the side frame 12 and the side frame rear portion 12B that constitutes the rear surface. The first reinforcing portion 30A is configured as a bead portion by, for example, pressing a part of the side frame side portion 12A to recess it toward the seat inner side. Here, the first reinforcing portion 30A is provided at least in the wide portion 12D, which is the widest portion of the side frame side portion 12A. In this embodiment, the first reinforcing portion 30A is provided along the trailing edge 12C from a position facing the through-hole 31D in the up-down direction to a position facing the airbag mounting hole 31C. That is, the first reinforcing portion 30A is provided at least at a position where the side frame 12 and the upper frame side portion 11A overlap, thereby increasing the strength of the joint between the side frame 12 and the upper frame 11. The upper end of the first reinforcing portion 30A may be located above the welding position between the side frame 12 and the upper frame 11. As shown in FIG. 2, the first reinforcing portion 30A is provided at a position where it overlaps vertically with the upper frame 11 and the cushion side frames 22A and 22B in a side view.

[0033] As shown in Figures 2, 3A and 3C, a second reinforcing portion 30B extending forward of the seat is formed on the side frame side portion 12A that constitutes the side portion of the side frame 12 from between the upper and lower ends of the first reinforcing portion 30A. Similar to the first reinforcing portion 30A, the second reinforcing portion 30B is configured as a bead portion formed by pressing a part of the side frame side portion 12A toward the seat inner side. Here, the second reinforcing portion 30B is formed between the airbag mounting hole 31A and the airbag mounting hole 31B. The rear end of the second reinforcing portion 30B is connected to the first reinforcing portion 30A, and the two are integrated. The front end of the second reinforcing portion 30B is located forward of the airbag mounting hole 31B and rearward of the front edge of the side frame side portion 12A.

[0034] As shown in Figures 2, 3A and 3C, a third reinforcing portion 30C extending from the lower end of the first reinforcing portion 30A toward the front of the seat is formed on the side frame side portion 12A that constitutes the side portion of the side frame 12. Similar to the first reinforcing portion 30A, the third reinforcing portion 30C is configured as a bead portion formed by pressing a part of the side frame side portion 12A toward the seat inner side. Here, the third reinforcing portion 30C is formed between the airbag mounting hole 31A and the airbag mounting hole 31C. The rear end of the third reinforcing portion 30C is connected to the first reinforcing portion 30A, and the two are integrated. The front end of the third reinforcing portion 30C is located forward of the airbag mounting hole 31C and rearward of the front edge of the side frame side portion 12A.

[0035] 2 also shows a vertical line V at a position overlapping with the rear end of the third reinforcing portion 30C. As shown in FIG. 2, the rear end of the third reinforcing portion 30C is located forward of the cross member 14. In other words, the cross member 14 is located rearward of the third reinforcing portion 30C.

[0036] As shown in FIG. 2, the second reinforcing portion 30B extends from the first reinforcing portion 30A at an angle that is approximately perpendicular (i.e., approximately a right angle) to the torso line T, which indicates the axis of the torso of a three-dimensional mannequin that resembles an occupant seated in a vehicle seat having the seat frame 1 as its skeleton. On the other hand, the third reinforcing portion 30C extends from the first reinforcing portion 30A at an angle that is not perpendicular to the torso line T (ie, an acute angle). That is, the second reinforcing portion 30B and the third reinforcing portion 30C extend from the first reinforcing portion 30A at different angles. In this way, by making the extension angles of the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C different from one another, it is possible to increase rigidity against load input from various directions. Additionally, the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C are each provided above the reclining unit 40 in the up-down direction.

[0037] The bottoms of the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C on the seat inner side (i.e., the bottoms of the beads) are located on the seat outer side of the ends of the flanges provided in front of the side frames 12. Additionally, the upper end of the first reinforcing portion 30A may be narrower than the lower end. Furthermore, the front end portions of the second reinforcing portion 30B and the third reinforcing portion 30C may be narrower than the rear portions. In addition, the front end portions of the second reinforcing portion 30B and the third reinforcing portion 30C may be positioned forward of the front wall portion 13B of the lower frame 13, the support portion 15A of the pressure-receiving member 15, the mounting portion of the reclining unit 40, the headrest mounting portion 17, and the rotation axis 16. Furthermore, the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C may all be positioned forward of the headrest attachment portion 17.

[0038] 3B, a rear reinforcing portion 30D is formed in the center of the side frame rear portion 12B of the side frame 12. A through hole 31E and a through hole 31F are formed in the upper and lower portions of the side frame rear portion 12B, respectively. The rear reinforcing portion 30D is formed as a bead by pressing a portion of the side frame rear portion 12B toward the seat interior side. The rear reinforcing portion 30D extends from a position facing the upper end of the first reinforcing portion 30A to a position below the lower end of the first reinforcing portion 30A. In addition, the rear reinforcement portion 30D is formed so that its upper end is located above the through hole 31E formed in the rear portion 12B of the side frame, and its lower end is located below the through hole 31F formed in the rear portion 12B of the side frame. Here, the central portion of the rear reinforcing portion 30D located between the through-holes 31E and 31F is a wide portion that is wider than the upper and lower ends. The lower end of the rear reinforcing portion 30D is positioned so as to overlap the lower frame 13 in the vertical direction. In this way, by forming the rear surface reinforcing portion 30D in the side frame rear portion 12B, it is possible to increase the strength over a wide range of the side frame rear portion 12B.

[0039] As described above, an inverted F-shaped bead portion that integrates the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C is provided on the side frame side portion 12A of the side frame 12. This improves the strength of a wide range of the side frame side portion 12A in a balanced manner. Furthermore, by providing the first reinforcing portion 30A along the trailing edge 12C, the strength of the trailing edge 12C can be increased. Furthermore, by providing the first reinforcing portion 30A at least in the wide portion 12D of the side frame side portion 12A, the strength of the wide portion 12D can be increased even when various through holes for attaching parts such as airbags are formed in the wide portion 12D. Furthermore, by forming the second reinforcing portion 30B and the third reinforcing portion 30C at positions that sandwich the airbag mounting hole 31A from above and below, the strength of the periphery of the airbag mounting hole 31A can be increased. Furthermore, by providing the second reinforcing portion 30B between the airbag mounting hole 31A and the airbag mounting hole 31B, the strength of the areas around the airbag mounting hole 31A and the airbag mounting hole 31B can be increased. Furthermore, by providing the third reinforcing portion 30C between the airbag mounting hole 31A and the airbag mounting hole 31C, the strength of the areas around the airbag mounting hole 31A and the airbag mounting hole 31C can be increased.

[0040] 3. Configuration of the first connecting bracket 18 and the second connecting bracket 19 Next, the configuration of the first connecting bracket 18 and the second connecting bracket 19 will be described with reference to FIGS. 1 and 4 to 6C.

[0041] FIG. 4 is a partially enlarged view of the periphery of the second connecting bracket 19 taken from viewpoint IV in FIG. 5A, 5B, and 5C correspond to an outer side view, a rear view, and an inner side view of the first connecting bracket 18, respectively. 6A, 6B, and 6C correspond to an outer side view, a rear view, and an inner side view of the second connecting bracket 19, respectively.

[0042] As shown in FIGS. 5A, 5B, and 5C, first connecting bracket 18 is provided with weakened portion 18A, shaft through-hole 18B, bolt fastening hole 18C, and bolt fastening hole 18D. The fragile portion 18A is provided between the shaft through hole 18B and the bolt fastening hole 18D and is a portion that is bent toward the outside of the seat. When a load is input to the first connecting bracket 18, the fragile portion 18A is easily deformed. The shaft through-hole 18B receives the rotation shaft 16 and mounts the left reclining unit 40. The left side frame 12 is connected to the first connecting bracket 18 via the left reclining unit 40. The left cushion side frame 22A is fixed to the bolt fastening holes 18C and 18D with fasteners such as bolts and nuts. For example, in the event of a rear-end collision of the vehicle, the weakened portion 18A of the first connecting bracket 18 deforms to absorb the impact.

[0043] As shown in FIGS. 6A, 6B, and 6C, second connecting bracket 19 is provided with a weak portion 19A, a shaft through-hole 19B, a bolt fastening hole 19C, a bolt fastening hole 19D, and a weak portion 19E. The fragile portion 19A is provided between the shaft through hole 19B and the bolt fastening hole 19D and is a portion that is bent toward the outside of the seat. When a load is input to the second connecting bracket 19, the fragile portion 19A is easily deformed. The shaft through-hole 19B receives the rotation shaft 16 and mounts the right reclining unit 40. The second connecting bracket 19 is connected to the right side frame 12 via the right reclining unit 40. The right cushion side frame 22B is fixed to the bolt fastening holes 19C and 19D with fasteners such as bolts and nuts. The weak portion 19E is provided between the shaft through hole 19B and the bolt fastening hole 19C and is a portion that is bent toward the outside of the seat. When a load is input to the second connecting bracket 19, the weak portion 19E is easily deformed. For example, in the event of a rear-end collision of the vehicle, the weak portions 19A and 19E of the second connecting bracket 19 are deformed to absorb the impact.

[0044] Note that, with respect to the fragile portion 18A of the first connecting bracket 18, the first connection portion with the shaft through-hole 18B side and the second connection portion with the bolt fastening hole 18D side are located at approximately the same position in the seat width direction. That is, in the first connecting bracket 18, the first connection portion and the second connection portion are not offset in the seat width direction. On the other hand, with respect to the weakened portion 19A of the second connecting bracket 19, the second connecting portion on the bolt fastening hole 19D side is located on the seat inner side in the seat width direction relative to the first connecting portion on the shaft through hole 19B side. In other words, the first connecting portion and the second connecting portion of the second connecting bracket 19 are offset in the seat width direction. Furthermore, in the first connecting bracket 18, no weak portion is provided between the shaft through hole 18B and the bolt fastening hole 18C. On the other hand, the second connecting bracket 19 has a weakened portion 19E between the shaft through-hole 19B and the bolt fastening hole 19C. In this way, by providing the weak portions asymmetrically in the first connecting bracket 18 and the second connecting bracket 19, the ease with which the seat frame 1 deforms when a load is input thereto is changed.

[0045] 1, the left cushion side frame 22A is provided with a height adjustment unit 41, but the right cushion side frame 22B is not provided with a similar part. Therefore, in the event of a rear-end collision, a larger load is input to the first connecting bracket 18 connected to the left cushion side frame 22A than to the second connecting bracket 19 connected to the right cushion side frame 22B. In response to this, in the seat frame 1, as described above, asymmetric weak portions are provided in the first connecting bracket 18 and the second connecting bracket 19, making the second connecting bracket 19 more susceptible to deformation than the first connecting bracket 18. This makes it possible to adjust the deformation of the first connecting bracket 18 and the second connecting bracket 19 to be the same degree.

[0046] [4. Configuration of the lower frame 13] Next, the configuration of the lower frame 13 will be described with reference to FIGS. FIG. 7 is a front view of the seat frame 1, and is an enlarged view of a portion around the lower frame 13. FIG. FIG. 8 is a rear view of the seat frame 1, and is a partially enlarged view of the lower frame 13 and its periphery. 9 is a cross-sectional view taken along line IX-IX in FIG. 7, and FIG. 10 is a cross-sectional view taken along line XX in FIG. FIG. 11 is a view taken along the arrow XI in FIG. 7, and is a partially enlarged view of the lower frame 13. As shown in FIG.

[0047] As shown in Figures 7 to 11, the lower frame 13 has a rear wall portion 13A formed with a J-shaped cross section that forms the rear portion of the seat, and a front wall portion 13B that forms the front portion of the seat and is formed continuously with the front end of the rear wall portion 13A.

[0048] 4.1. Configuration of the front wall portion 13B of the lower frame 13 First, the configuration of the front wall portion 13B of the lower frame 13 will be mainly described. As shown in FIGS. 7 and 9, the front wall portion 13B is a portion extending upward from the front end of the rear wall portion 13A across the seat width and facing the support portion 15A. 7, a wire 15B having three clips 50 attached to its lower end is attached to the support portion 15A. Three attachment portions 51, which are through holes into which the clips 50 fit, are formed in the front wall portion 13B. 7, the attachment portion 51 is spaced apart from the support portion 15A and is provided below the support portion 15A. The attachment portion 51 is also provided inside the left and right ends of the support portion 15A. Then, the clip 50 attached to the wire 15B is fitted into the attachment portion 51 of the front wall portion 13B, thereby fixing the wire 15B to the front wall portion 13B.

[0049] As shown in Fig. 7, in the front wall portion 13B, upper reinforcement portions 60A, 60B, and 60C extending in the seat width direction are formed above the mounting portion 51 of each clip 50. As shown in Fig. 7, the upper reinforcement portions 60A, 60B, and 60C are each formed on approximately the same horizontal plane, with the upper reinforcement portion 60A on the left side, the upper reinforcement portion 60B in the center, and the upper reinforcement portion 60C on the right side. The upper reinforcing portions 60A, 60B, and 60C are formed as bead portions by pressing a part of the front wall portion 13B to recess it toward the rear of the seat.

[0050] 7, upper reinforcement portion 60A, upper reinforcement portion 60B, and upper reinforcement portion 60C are each formed in a shape that follows the upper edge of front wall portion 13B. That is, the upper edge of front wall portion 13B has a straight line in the center and arc-shaped left and right ends, and accordingly, upper reinforcement portion 60A has an arc-shaped left end and linear the rest of the end, upper reinforcement portion 60B is linear, and upper reinforcement portion 60C has an arc-shaped right end and linear the rest of the end. Furthermore, the left end of the upper reinforcement portion 60A is positioned outward in the seat width direction from the opposing attachment portion 51. Similarly, the right end of the upper reinforcement portion 60C is positioned outward in the seat width direction from the opposing attachment portion 51.

[0051] 7, lower reinforcing portions 61A and 61B are formed spaced apart from each other at the boundary between the front wall portion 13B and the rear wall portion 13A below the mounting portion 51 that faces the upper reinforcing portion 60A. The lower reinforcing portions 61A and 61B are formed as bead portions that are recessed toward the rear of the seat by press working the boundary between the front wall portion 13B and the rear wall portion 13A. As shown in FIG. 7, the attachment portion 51 facing the upper reinforcement portion 60A is provided between the upper reinforcement portion 60A and the lower reinforcement portions 61A and 61B in the seat up-and-down direction. The left end of the upper reinforcement portion 60A is located further outward in the seat width direction than the lower reinforcement portion 61A, and the right end of the upper reinforcement portion 60A is located further outward in the seat width direction than the lower reinforcement portion 61B. That is, the lower reinforcement portions 61A and 61B are formed on the inner side in the seat width direction relative to the upper reinforcement portion 60A provided at the top. The distance between the lower reinforcement portions 61A and 61B is shorter than the length of the upper reinforcement portion 60A in the width direction.

[0052] 7, lower reinforcement portions 61C and 61D are formed spaced apart from each other at the boundary between the front wall portion 13B and the rear wall portion 13A below the mounting portion 51 that faces the upper reinforcement portion 60B. The lower reinforcement portions 61C and 61D are formed as bead portions that are recessed toward the rear of the seat by press working the boundary between the front wall portion 13B and the rear wall portion 13A. 7, the attachment portion 51 facing the upper reinforcement portion 60B is provided between the upper reinforcement portion 60B and the lower reinforcement portions 61C and 61D in the seat vertical direction. The attachment portion 51 facing the upper reinforcement portion 60B is provided between the lower reinforcement portions 61C and 61D in the seat width direction. The left end of the upper reinforcement portion 60B is located further outward in the seat width direction than the lower reinforcement portion 61C, and the right end of the upper reinforcement portion 60B is located further outward in the seat width direction than the lower reinforcement portion 61D. That is, the lower reinforcement portions 61C and 61D are formed on the inner side in the seat width direction relative to the upper reinforcement portion 60B provided at the top. The distance between the lower reinforcement portions 61C and 61D is shorter than the length of the upper reinforcement portion 60B in the width direction.

[0053] 7, lower reinforcing portions 61E and 61F are formed spaced apart from each other at the boundary between the front wall portion 13B and the rear wall portion 13A below the mounting portion 51 that faces the upper reinforcing portion 60C. The lower reinforcing portions 61E and 61F are formed as bead portions that are recessed toward the rear of the seat by press working the boundary between the front wall portion 13B and the rear wall portion 13A. As shown in FIG. 7, the attachment portion 51 facing the upper reinforcement portion 60C is provided between the upper reinforcement portion 60C and the lower reinforcement portions 61E and 61F in the seat up-and-down direction. The left end of the upper reinforcement portion 60C is located further outward in the seat width direction than the lower reinforcement portion 61E, and the right end of the upper reinforcement portion 60C is located further outward in the seat width direction than the lower reinforcement portion 61F. That is, the lower reinforcement portions 61E and 61F are formed on the inner side in the seat width direction relative to the upper reinforcement portion 60C provided at the top. The distance between the lower reinforcement portions 61E and 61F is shorter than the length of the upper reinforcement portion 60C in the width direction.

[0054] 7, the distance between adjacent upper reinforcement portions 60A and 60B on the upper side is shorter than the distance between adjacent lower reinforcement portions 61B and 61C on the lower side. Similarly, the distance between adjacent upper reinforcement portions 60B and 60C on the upper side is shorter than the distance between adjacent lower reinforcement portions 61D and 61E on the lower side.

[0055] For example, when attaching the pressure-receiving member 15 to the front surface of the rear wall portion 13A, the rotating shaft 16 is provided between the rear wall portion 13A and the front wall portion 13B, and since there is not enough space, the attachment work of the pressure-receiving member 15 is not easy. On the other hand, in the seat frame 1, an attachment portion 51 for attaching the wire 15B of the pressure-receiving member 15 is provided on the front wall portion 13B of the lower frame 13, so that the rotating shaft 16 does not interfere with the worker's hand, thereby improving the workability of installing the pressure-receiving member 15.

[0056] [4.2. Configuration of rear wall portion 13A of lower frame 13] Next, the configuration of the rear wall portion 13A of the lower frame 13 will be mainly described. 9, the upper end of the rear wall portion 13A is located higher than the upper end of the front wall portion 13B. The lower end of the support portion 15A is located higher than the upper end of the front wall portion 13B and lower than the upper end of the rear wall portion 13A. 9, the front wall portion 13B is provided substantially parallel to the support portion 15A. Since the support portion 15A is substantially parallel to the torso line T, in other words, the front wall portion 13B is provided substantially parallel to the torso line T.

[0057] 8, an upward protrusion 75 that protrudes upward is provided at each upper portion of the rear wall portion 13A on both outer sides in the seat width direction. The upward protrusion 75 is formed in a shape that follows the side frame 12, and a reinforcing portion 74 is formed in a position facing the rear surface reinforcing portion 30D of the side frame 12. The reinforcing portion 74 is formed as a bead portion that is recessed toward the front of the seat and is shaped to engage with the rear surface reinforcing portion 30D. Both side portions of the rear wall portion 13A in the seat width direction are joined to the side frames 12 by welding.

[0058] According to the seat frame 1 of this embodiment described above, the rigidity of the side frame 12 can be improved by providing the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C on the side frame side portion 12A of the side frame 12. Here, the first reinforcing portion 30A, the second reinforcing portion 30B, and the third reinforcing portion 30C extend in different directions, so that the rigidity against the input of loads from various directions can be improved.

[0059] Furthermore, according to the seat frame 1, the attachment portion 51 for the pressure-receiving member 15 is provided on the front wall portion 13B of the lower frame 13, so that the workability of attaching the pressure-receiving member 15 can be improved. Furthermore, by providing reinforcing portions above and below the mounting portion 51 of the front wall portion 13B, the rigidity around the mounting portion 51 can be improved.

[0060] [5. Modifications] The present invention is not limited to the above-described embodiment. Below, modified examples of the reinforcing portion (bead shape) formed on the side frame side portion 12A of the side frame 12 will be described with reference to Figures 12A to 12D. 12A to 12D each show an outer side view of a side frame 12 according to a modified example.

[0061] First, the side frame 12 according to the first modified example will be described. 12A, the side frame 12 according to the first modified example is formed with reinforcing portions 80A, 80B, 80C, 80D, and 80E. Here, reinforcing portions 80A, 80B, 80C, 80D, and 80E are each formed as a bead portion by pressing the side frame side portion 12A toward the seat inner side. The reinforcing portion 80A is provided along the rear edge 12C of the side frame side portion 12A. The reinforcing portion 80B is provided between the airbag mounting hole 31A and the airbag mounting hole 31B so as to extend in the front-rear direction of the seat. The reinforcing portion 80C is provided so as to extend in the front-rear direction of the seat between the airbag mounting hole 31A and the airbag mounting hole 31C. The reinforcing portion 80D is provided below the airbag mounting hole 31C so as to extend in the front-rear direction of the seat. The reinforcing portion 80E is provided above the airbag mounting hole 31B and along the front edge of the side frame side portion 12A.

[0062] As shown in FIG. 12A, each of reinforcing portions 80A, 80B, 80C, 80D, and 80E may be provided as an independent bead portion without being connected to other reinforcing portions. Furthermore, the reinforcing portions 80A, 80B, 80C, 80D, and 80E may extend in different directions.

[0063] Next, a side frame 12 according to a second modified example will be described. 12B, the side frame 12 according to the second modified example is formed with reinforcing portions 81A, 81B, and 81C. Here, the reinforcing portions 81A, 81B, and 81C are each formed as a bead portion by pressing the side frame side portion 12A toward the seat inner side. The reinforcing portion 81A is provided along the rear edge 12C of the side frame side portion 12A. However, the lower end of the reinforcing portion 81A is bent toward the inside of the seat. The reinforcing portion 81B is provided to extend in the front-rear direction of the seat between the airbag mounting holes 31A and 31B. The rear end of the reinforcing portion 81B is connected to the reinforcing portion 81A. The reinforcing portion 81C is provided above the airbag mounting hole 31B and along the front edge of the side frame side portion 12A.

[0064] Next, a side frame 12 according to a third modified example will be described. 12C, the side frame 12 according to the third modified example is formed with reinforcing portions 82A, 82B, 82C, and 82D. Here, the reinforcing portions 82A, 82B, 82C, and 82D are each formed as a bead portion by pressing the side frame side portion 12A toward the seat inner side. The reinforcing portion 82A is provided along the rear edge 12C of the side frame side portion 12A. However, the lower end of the reinforcing portion 82A is bent toward the inside of the seat. The reinforcing portion 82B is provided to extend in the front-rear direction of the seat between the airbag mounting holes 31A and 31B. The rear end of the reinforcing portion 82B is connected to the reinforcing portion 82A. The reinforcing portion 82C is provided so as to extend in the front-rear direction of the seat from the bent portion of the reinforcing portion 82A toward the airbag mounting hole 31C. The rear end of the reinforcing portion 82C is connected to the reinforcing portion 82A. The reinforcing portion 82D is provided above the airbag mounting hole 31B and along the front edge of the side frame side portion 12A.

[0065] Next, a side frame 12 according to a fourth modified example will be described. 12D, the side frame 12 according to the fourth modification is formed with reinforcing portions 83A, 83B, and 83C. Here, the reinforcing portions 83A, 83B, and 83C are each formed as a bead portion by pressing the side frame side portion 12A toward the seat inner side. The reinforcing portion 83A is provided along the rear edge 12C of the side frame side portion 12A. The reinforcing part 83B is formed in an annular shape, and its rear end is connected to the reinforcing part 83A. The reinforcing part 83B is formed between the airbag mounting hole 31A and the airbag mounting holes 31B and 31C, and includes the airbag mounting hole 31A. The reinforcing portion 83C is provided above the airbag mounting hole 31B and along the front edge of the side frame side portion 12A.

[0066] [Second embodiment] Next, a seat frame 1 according to a second embodiment will be described with reference to Figures 13 to 18. In the seat frame 1 according to the second embodiment, a cross member 100 installed on the upper frame 11 differs from the cross member 14 shown in Figure 1, but the two are the same in other respects. Therefore, the configuration of the cross member 100 will be described below.

[0067] As shown in FIG. 13, a cross member 100 extending in the seat width direction is installed between the left and right bent portions of the upper frame 11. The left and right ends 103 of the cross member 100 are welded and fixed to the left and right bent portions of the upper frame 11 .

[0068] A first recess 101 recessed downward is formed at the upper end of the cross member 100 between the left and right ends 103. When the first recess 101 is provided at the lower end of the cross member 100, the first recess 101 has a shape recessed upward between the left and right ends 103.

[0069] 13 and 14, the first recess 101 is provided in the center in the seat width direction of the cross member 100. The center in the seat width direction of the cross member 100 is between the left and right headrest mounting portions 17.

[0070] The cross member 100 has wide portions 105 on the left and right sides of the first recess 101 in the seat width direction. The wide portions 105 are wider in the up-down direction than the first recess 101. The cross member 100 has a symmetrical shape with the first recess 101 at the center. In other words, the shapes of the wide portions 105 on the left and right are symmetrical.

[0071] 14, the wide portion 105 is curved so as to protrude rearward of the seat. Specifically, the outer portions of the wide portion 105 in the seat width direction are curved so as to protrude rearward of the seat.

[0072] As shown in FIGS. 13 to 17, a reinforcing portion 104 is formed in the center of the cross member 100 in the vertical direction. The reinforcing portion 104 is formed across the first recess 101 and the left and right wide portions 105. The reinforcing portion 104 protrudes forward of the seat. Specifically, the reinforcing portion 104 is formed, for example, by pressing a portion of the cross member 100 to protrude forward of the seat as a bead portion. This improves the rigidity of the cross member 100. As shown in FIG. 13, the reinforcing portion 104 of the wide portion 105 has a larger vertical width than the reinforcing portion 104 of the first recess 101.

[0073] 13, a first through hole 106 and a second through hole 107 are formed in the reinforcing portion 104 of the wide portion 105. The first through hole 106 is a rectangular through hole, and the second through hole 107 is a circular through hole. As such, the shape of the through holes formed in the reinforcing portion 104 of the wide portion 105 is not particularly limited. By forming through holes such as the first through hole 106 and the second through hole 107 in the cross member 100, the weight of the cross member 100 can be reduced.

[0074] 13 to 17, a first flange portion 108A is formed at the upper end of the cross member 100. The first flange portion 108A is a portion where the upper end of the cross member 100 is bent toward the front of the seat. The first flange portion 108A is formed across the first recessed portion 101 and the left and right wide portions 105. The first flange portion 108A is formed at a position facing the first recessed portion 101 in the up-down direction.

[0075] Additionally, a second recess 102A recessed downward from the seat is formed in the first flange portion 108A of the wide portion 105. In other words, the second recess 102A is a recess provided at the upper end of the cross member 100, and is different from the first recess 101. The lower part of the second recess 102A protrudes forward of the seat.

[0076] 13 to 17, a second flange portion 108B is formed at the lower end of the cross member 100. The second flange portion 108B is a portion where the lower end of the cross member 100 is bent toward the front of the seat. The second flange portion 108B is formed across the first recessed portion 101 and the left and right wide portions 105.

[0077] Additionally, a second recess 102B recessed above the seat is formed in the second flange portion 108B of the wide portion 105. In other words, the second recess 102B is a recess provided at the lower end of the cross member 100 and is different from the first recess 101. The upper part of the second recess 102B protrudes forward of the seat.

[0078] Additionally, the second recess 102A, the first through-hole 106, and the second recess 102B are arranged at positions that overlap in the vertical direction.

[0079] Although the above-described cross member 100 has both the first flange portion 108A and the second flange portion 108B, it may have either the first flange portion 108A or the second flange portion 108B.

[0080] Here, an example of how members are attached to the cross member 100 of the seat frame 1 according to the second embodiment will be described with reference to FIG. As shown in FIG. 18, a blower 92 is attached above the first recess 101 of the cross member 100. Specifically, the mounting member 90 is fixed between the upper frame 11 and the first recess 101 of the cross member 100. For example, the mounting member 90 is a metal plate, and the mounting member 90 is welded to the upper frame 11 and the first recess 101 of the cross member 100 at the weld portion 91.

[0081] Then, the blower 92 is fixed to the mounting member 90 using fasteners 93 such as screws. This allows the blower 92 to be disposed in the space above the first recess 101 of the cross member 100. As described above, since the first recess 101 has a downwardly recessed shape, a larger space is formed above the first recess 101 of the cross member 100 than the wide portion 105. Therefore, a relatively large member such as the blower 92 can be placed above the first recess 101.

[0082] Furthermore, the locking portion 95 of the cover portion 94 can be attached to the second recess 102A and the second recess 102B of the cross member 100. For example, if the locking portion 95 is a hook, the hook can be engaged with the protruding portion of the second recess 102A (or the second recess 102B) to attach the locking portion 95 to the second recess 102A (or the second recess 102B). In this way, various members can be attached to the cross member 100.

[0083] [Effect of seat frame 1] The seat frame 1 includes side frames 12 arranged on the left and right sides, and a first reinforcing portion 30A extending in the up-down direction along the rear edge of a side frame side portion 12A of the side frame 12 located on the outer side in the seat width direction. According to the seat frame 1, the rigidity of the side frame 12 can be improved by reinforcing the rear edges of the side frame side portions 12A.

[0084] In the seat frame 1, the first reinforcing portion 30A is provided at least in the wide portion of the side frame side portion 12A that is the widest in the seat front-rear direction. In this way, the wide portions of the side frame side portions 12A are reinforced, and the rigidity of the side frame 12 can be improved.

[0085] The seat frame 1 also has a second reinforcing portion 30B that is provided on the side frame side portion 12A and extends in the front-to-rear direction of the seat, and the second reinforcing portion 30B is provided within the vertical range in which the first reinforcing portion 30A extends. In this way, the side frame side portions 12A are reinforced in the up-down direction and the front-rear direction, and the rigidity of the side frame 12 can be improved.

[0086] In addition, in the seat frame 1, the first reinforcing portion 30A and the second reinforcing portion 30B are connected to each other. This allows the first reinforcing portion 30A and the second reinforcing portion 30B to be integrally formed, which makes it easier to form the reinforcing portions.

[0087] The seat frame 1 also has a third reinforcing portion 30C that is provided on the side frame side portion 12A and extends in the front-rear direction at a position spaced downward from the second reinforcing portion 30B. This makes it possible to improve the rigidity of the side frame side portion 12A over a wide range.

[0088] In the seat frame 1, the second reinforcing portion 30B is connected between the upper and lower ends of the first reinforcing portion 30A, and the third reinforcing portion 30C is connected to the lower end of the first reinforcing portion 30A. This improves the rigidity of the side frame side portion 12A in a well-balanced manner.

[0089] In addition, in the seat frame 1, the second reinforcing portion 30B and the third reinforcing portion 30C extend at different angles relative to the first reinforcing portion 30A. This improves the rigidity against load input from various angles.

[0090] In the seat frame 1, the second reinforcing portion 30B extends in a direction substantially perpendicular to the torso line T. This makes it possible to improve rigidity in the direction in which the load is large.

[0091] In the seat frame 1, the second reinforcing portions 30B extend between the plurality of through-holes formed in the side frame side portions 12A. This can improve the rigidity around the through hole.

[0092] In addition, in the seat frame 1, the multiple through holes include an airbag mounting hole 31A for mounting an airbag, and the second reinforcing part 30B and the third reinforcing part 30C are each provided at positions sandwiching the airbag mounting hole 31A from above and below. This improves the rigidity of the portion of the side frame 12 where the airbag is attached.

[0093] Furthermore, in the seat frame 1, the first reinforcing portion 30A is located at a position facing at least one of the plurality of through holes in the up-down direction. This can improve the rigidity of the side frame 12 around the through-hole.

[0094] The seat frame 1 also includes an upper frame 11 that connects the upper portions of the side frames 12, and the side frame side portions 12A are joined to upper frame side portions 11A that are located on the outer side in the seat width direction of the upper frame 11. The first reinforcing portion 30A is provided at a position where the side frame side portions 12A and the upper frame side portions 11A overlap. This improves the rigidity of the joint between the side frame 12 and the upper frame 11.

[0095] The seat frame 1 also includes an upper frame 11 that forms the upper portion of the seatback frame 10, and a cross member 100 that is installed on the upper frame 11. The cross member 100 has left and right end portions 103 in the seat width direction that are fixed to the upper frame 11, and a first recess 101 that is recessed upward or downward between the left and right end portions 103. According to the seat frame 1, the weight of the cross member 100 can be reduced compared to when no recess is provided in the cross member 100. This allows the weight of the cross members 100 installed on the left and right sides of the seat frame 1 to be reduced.

[0096] In the seat frame 1, the first recess 101 is provided in the center of the cross member 100 in the seat width direction. In this way, by providing the first recess at a position facing the occupant, the seating comfort of the seat can be improved. Furthermore, according to the seat frame 1, a space can be provided near the center of the cross member 100 in which members such as the blower 92 can be disposed.

[0097] In addition, in the seat frame 1, the cross member 100 has a reinforcing portion 104 formed in the first recess 101. This makes it possible to suppress a decrease in rigidity in the vicinity of the first recess 101 of the cross member 100.

[0098] In addition, in the seat frame 1, the cross member 100 has wide portions 105 provided on the left and right sides of the first recess 101 in the seat width direction, and the reinforcing portion 104 is formed across both the first recess 101 and the wide portions 105. This improves the rigidity of the cross member 100.

[0099] In addition, in the seat frame 1, the cross member 100 is provided with through holes (first through hole 106 and second through hole 107). This allows the weight of the cross member 100 to be further reduced.

[0100] In addition, in the seat frame 1, the through holes (first through hole 106, second through hole 107) are formed in the wide portion 105. In this way, by forming the through holes (first through hole 106, second through hole 107) in the wide portion 105, it is possible to form larger through holes compared to when the through holes are formed in the first recess 101. This allows the weight of the cross member 100 to be further reduced.

[0101] In the seat frame 1, the through holes (first through hole 106 and second through hole 107) are formed in the reinforcing portion 104 in the wide portion 105. This allows the weight of the cross member 100 to be reduced, and also prevents the rigidity of the cross member 100 from decreasing.

[0102] In addition, in the seat frame 1, at least a part of the wide portion 105 is curved so as to protrude rearward. This improves the rigidity of the cross member 100. Furthermore, the cross member 100 can be shaped to fit the body shape of the occupant, improving the seating comfort.

[0103] The seat frame 1 also has second recesses (second recesses 102A, 102B) different from the first recesses 101, which are provided at least at one of the upper end and the lower end of the cross member 100. This allows the weight of the cross member 100 to be further reduced. Furthermore, the second recesses (second recesses 102A and 102B) can be used to lock members such as the locking portion 95 of the cover portion 94. This allows the number of parts constituting the seat to be reduced, thereby reducing the weight of the seat.

[0104] The seat frame 1 also has flange portions (first flange portion 108A, second flange portion 108B) provided on at least one of the upper end and the lower end of the cross member 100. The flange portions (first flange portion 108A, second flange portion 108B) are formed at positions facing the first recessed portion 101 in the up-down direction. This allows the rigidity of the first recess 101 to be improved. [Explanation of symbols]

[0105] 1 seat frame 10 Seat back frame 11 Upper frame 11A Upper frame side 12 Side frame 12A Side frame side 12B Rear side frame 12C trailing edge 12D wide section 13 Lower frame 13A Rear wall 13B Front wall 14 Cross member 14A Recess 14B End 15 Pressure-receiving member 15A Support part 15B wire 15C Wire 16 Rotation Axis 17 Headrest mounting part 18 First connecting bracket 18A Weak part 18B Shaft through hole 18C Bolt fastening hole 18D Bolt fastening hole 19 Second connecting bracket 19A Weak part 19B Shaft through hole 19C Bolt fastening hole 19D Bolt fastening hole 19E Weak part 20 Seat cushion frame 21 Pan Frame 22A, 22B Cushion side frame 23 Connecting pipe 24 Pressure-receiving member 30A First reinforcement part 30B 2nd reinforcement part 30C 3rd reinforcement part 30D Rear reinforcement part 31A Airbag mounting hole 31B Airbag mounting hole 31C Airbag mounting hole 31D through hole 31E Through hole 31F through hole 40 Reclining unit 41 Height adjustment unit 50 clips 51 Mounting part 52 Welded section 60A Upper reinforcement 60B Upper reinforcement part 60C Upper reinforcement part 61A Lower reinforcement 61B Lower reinforcement 61C Lower reinforcement 61D Lower reinforcement 61E Lower reinforcement 61F Lower reinforcement 74 Reinforcement 75 Upper protrusion 80A Reinforcement 80B reinforcement 80C Reinforcement part 80D reinforcement 80E reinforcement part 81A Reinforcement 81B Reinforcement 81C Reinforcement part 82A Reinforcement 82B Reinforcement 82C Reinforcement 82D Reinforcement 83A Reinforcement 83B Reinforcement part 83C Reinforcement 90 Mounting material 91 Welded parts 92 Blower 93 Fasteners 94 Epidermis 95 Locking part 100 cross member 101 First recess 102A Second recess 102B Second recess 103 End 104 Reinforcement 105 Wide section 106 First through hole 107 Second through hole 108A First flange part (flange part) 108B Second flange part (flange part) T Torso Line V vertical line

Claims

1. A seat frame having side frames arranged on the left and right, The seat frame further comprises a first reinforcing portion extending in the up-down direction along a rear edge of a side portion of the side frame located on an outer side in the seat width direction.

2. The seat frame according to claim 1, wherein the first reinforcing portion is provided at least in a wide portion of the side frame lateral portion that is widest in the seat front-rear direction.

3. a second reinforcing portion provided on a side portion of the side frame and extending in the front-rear direction of the seat; The seat frame according to claim 1 , wherein the second reinforcing portion is provided within a range in which the first reinforcing portion extends.

4. The seat frame according to claim 3 , wherein the first reinforcing portion and the second reinforcing portion are connected to each other.

5. The seat frame according to claim 3, further comprising a third reinforcing portion provided on a side portion of the side frame and extending in the front-rear direction at a position spaced downward from the second reinforcing portion.

6. the second reinforcing portion is connected between the upper end and the lower end of the first reinforcing portion, The seat frame according to claim 5 , wherein the third reinforcing portion is connected to the lower end of the first reinforcing portion.

7. The seat frame according to claim 5, wherein the second reinforcing portion and the third reinforcing portion extend at different angles relative to the first reinforcing portion.

8. The seat frame according to claim 3 , wherein the second reinforcing portion extends in a direction substantially perpendicular to a torso line.

9. The seat frame according to claim 5, wherein the second reinforcing portion extends between a plurality of through holes formed in the side frame side portion.

10. the plurality of through holes include an airbag mounting hole for mounting an airbag, The seat frame according to claim 9, wherein the second reinforcing portion and the third reinforcing portion are provided at positions sandwiching the airbag mounting hole from above and below.

11. The seat frame according to claim 9, wherein the first reinforcing portion is located at a position facing at least one of the plurality of through holes in the up-down direction.

12. an upper frame connecting upper portions of the side frames; the side frame side portion is joined to an upper frame side portion located on the outer side in the seat width direction of the upper frame, The seat frame according to claim 1 , wherein the first reinforcing portion is provided at least at a position where the side frame side portion and the upper frame side portion overlap each other.

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