Vehicle seats

Abstract

To provide a seat for vehicles which enables improvement of occupant protection performance and cost reduction.SOLUTION: A seat for vehicles includes: a seat cushion frame; and a cover member which covers the seat cushion frame from the outer side. The seat cushion frame includes cushion side frames 11 extending in an anteroposterior direction. The cushion side frame 11 has: a cover fixing part 117 having an opening 117a which penetrates through the cushion side frame 11 and an engagement piece 117d which engages with the cover member; flanges 112, 113 which are formed at edges as seen in a vertical direction of the cushion side frame 11 so as to extend along the cushion side frame 11 in the anteroposterior direction; and reinforcement parts 119 formed in positions behind a front end 117b of the opening 117a of the flanges 112, 113.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat having a seat cushion frame. [Background technology]

[0002] Conventionally, mechanisms have been proposed for vehicle seat frames that enhance occupant protection against impacts during rear-end collisions. For example, the vehicle seat frame described in Patent Document 1 listed below has a weak part in a bracket that connects a seat back frame and a seat cushion frame, and the weak part is deformed during a rear-end collision to absorb the impact. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2017 / 022737 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the technology described in Patent Document 1, it is possible to partially absorb the impact applied during a rear-end collision by deforming the weak part, but further improvements were desired to achieve both improved protection for occupants and cost reduction.

[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 vehicle seat that can achieve both improved protection for occupants and cost reduction. [Means for solving the problem]

[0006] The above-mentioned problem is solved by a vehicle seat according to the present invention, which provides a vehicle seat including a seat cushion frame and a cover member that covers the seat cushion frame from the outside, wherein the seat cushion frame includes a cushion side frame extending in a front-rear direction, the cushion side frame including an opening that penetrates the cushion side frame, a cover fixing portion having an engaging piece that engages with the cover member, a flange formed on an edge portion of the cushion side frame in a vertical direction and extending in a front-rear direction along the cushion side frame, and a reinforcing portion formed on a portion of the flange that is located rearward of a front end portion of the opening. The reinforcing portion is formed only at a position rearward of the front end of the opening. This is solved by:

[0007] According to the above configuration, an opening is formed in the cover fixing portion in the cushion side frame. The area around the opening has low rigidity and can absorb impact by deforming during a rear-end collision. Furthermore, because the area around the opening has low rigidity, it is difficult to achieve a sufficient reinforcing effect even if a reinforcing portion is formed around the opening. Therefore, by forming a reinforcing portion in at least a portion of the flange formed on the vertical edge of the cushion side frame that is located rearward of the front end of the opening, the rigidity of the cushion side frame can be effectively increased without losing impact absorption. Furthermore, by forming the reinforcing portion behind the opening, the manufacturing cost of the cushion side frame can be reduced compared to when the reinforcing portion is formed over the entire length of the flange, which makes it possible to achieve both improved occupant protection and cost reduction.

[0008] The reinforcing portion is and the vertical position are the same. This is preferable. According to the above configuration, The reinforcing portion curves and extends upward along the rear end of the cushion side frame, thereby increasing the rigidity of the cushion side frame in the vertical direction and improving the protection of the occupant. This becomes possible.

[0011] Furthermore, it is preferable that the flange has an upper flange extending in the front-to-rear direction at the upper edge of the cushion side frame and a lower flange extending in the front-to-rear direction at the lower edge of the cushion side frame, and that the reinforcing portion be formed on the upper flange and the lower flange. According to the above configuration, by forming reinforcing portions on both the upper flange and the lower flange, the rigidity of the cushion side frame can be increased, and the protection of the occupant can be improved.

[0012] It is also preferable that the front end of the reinforcing portion formed on the upper flange and the front end of the reinforcing portion formed on the lower flange are positioned at the same position in the front-to-rear direction. According to the above configuration, the rigidity of the cushion side frame can be increased up to the front end of the reinforcing portion, thereby improving the protection of the occupant.

[0015] It is also preferable that a pan frame is installed on the front end side of the cushion side frame, and the cover fixing portion is formed at a position between the pan frame and the reinforcing portion in the front-rear direction. According to the above configuration, the rigidity of the front of the cover fixing portion is increased by the pan frame, and the rigidity of the rear of the cover fixing portion is increased by the reinforcing portion, thereby ensuring shock absorption around the cover fixing portion and increasing the rigidity of the entire cushion side frame. Furthermore, the manufacturing costs of the cushion side frame can be reduced compared to when the reinforcing portion is formed over the entire length of the cushion side frame, thereby achieving both improved occupant protection and cost reduction.

[0016] Furthermore, it is preferable that the flange has a bent portion that bulges outward in the left-right direction from the edge in the vertical direction and bends back inward in the left-right direction, and a flat portion that extends approximately horizontally inward in the left-right direction, and that the reinforcing portion is formed on the bent portion and the flat portion. According to the above configuration, the reinforcing portion can be formed over a wider area, thereby enhancing the reinforcing effect and improving the protection of the occupant. Furthermore, the above problem is solved by the vehicle seat of the present invention, which provides a vehicle seat including a seat cushion frame and a cover member that covers the seat cushion frame from the outside, wherein the seat cushion frame includes a cushion side frame extending in the front-to-rear direction, the cushion side frame having an opening that penetrates the cushion side frame, a cover fixing portion having an engaging piece that engages with the cover member, a flange formed on the vertical edge of the cushion side frame and extending front-to-rear along the cushion side frame, and a reinforcing portion formed on a portion of the flange that is located rearward of the front end of the opening, and a pan frame is installed on the front end side of the cushion side frame, and the cover fixing portion is formed at a position between the pan frame and the reinforcing portion in the front-to-rear direction. [Effects of the Invention]

[0017] According to the present invention, it is possible to effectively increase the rigidity of the cushion side frame and reduce manufacturing costs, thereby achieving both improved occupant protection and cost reduction.

[0018] It is also possible to achieve both impact absorption in the event of a rear collision and impact resistance due to improved rigidity.

[0019] In addition, it is possible to prevent the engaging piece from being deformed by the impact of a rear-end collision.

[0020] Furthermore, the rigidity of the cushion side frame in the vertical direction can be increased, thereby improving the protection of the occupant.

[0021] Furthermore, the rigidity of the cushion side frame in the vertical direction can be increased, and deformation of the engaging piece due to an impact in the vertical direction can be suppressed.

[0022] Furthermore, since the reinforcing portion can be formed over a wider area, the reinforcing effect can be enhanced. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is an explanatory diagram of a basic configuration of a vehicle seat according to an embodiment of the present invention; [Figure 2] 1 is a perspective view of a vehicle seat frame according to an embodiment of the present invention; [Figure 3A] 10 is a diagram of the height adjustment mechanism as seen from the inside in the left-right direction, showing the vehicle seat in its uppermost position. FIG. [Figure 3B]10 is a diagram of the height adjustment mechanism as seen from the inside in the left-right direction, showing the vehicle seat in its lowest position. FIG. [Figure 4] 10A and 10B are explanatory diagrams of reinforcing portions of the cushion side frame. [Figure 5] FIG. 5 is a cross-sectional view of FIG. 4 . [Figure 6] FIG. 4 is a perspective view of a cover fixing portion, and is an enlarged view of a main portion. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 4. [Figure 8] FIG. 4 is a perspective view of a reinforcing portion, and is an enlarged view of a main portion. [Figure 9] FIG. 10 is an explanatory diagram of a reinforcing portion according to a first modified example. [Figure 10] 10A and 10B are explanatory diagrams of a reinforcing portion according to a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, a vehicle seat according to an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described with reference to FIGS.

[0025] The present embodiment relates to a vehicle seat including a seat cushion frame and a cover member that covers the seat cushion frame from the outside, the seat cushion frame including cushion side frames extending in the front-rear direction, the cushion side frames including a cover fixing portion having an opening penetrating the cushion side frames and an engaging piece that engages with the cover member, a flange formed on the vertical edge of the cushion side frame and extending in the front-rear direction along the cushion side frame, and a reinforcing portion formed on a portion of the flange that is located rearward of the front end of the opening. Note that the following embodiment will be described as an example in which the vehicle seat according to the present invention is applied to a vehicle seat.

[0026] In the following description, the "front-rear direction" refers to the front-rear direction as seen from the occupant of the vehicle seat, and is the direction that coincides with the direction of travel of the vehicle. The "seat width direction" refers to the width direction of the vehicle seat, and coincides with the left-right direction as seen from the occupant of the vehicle seat. In the following, "left" refers to the left as seen from the occupant, and similarly, "right" refers to the right as seen from the occupant. The "height direction" refers to the height direction of the vehicle seat, and coincides with the up-down direction as seen from the front of the vehicle seat.

[0027] <<Main components of the vehicle seat S1>> First, the basic configuration of a vehicle seat S1 according to this embodiment will be described with reference to Fig. 1. As shown in Fig. 1, the vehicle seat S1 has a seat cushion S2, a seat back S3, and a headrest S4. A seat cover S5 is attached below the seat cushion S2. The seat cushion S2 is constructed by covering a seat cushion frame 10 (see FIG. 2) with a pad S2a and a covering material S2b. The seat back S3 is constructed by covering a seat back frame 20 (see FIG. 2) with a pad and a covering material. The headrest S4 is constructed by covering a headrest frame (not shown) with a pad and a covering material.

[0028] 2, the vehicle seat S1 has, as its framework, a vehicle seat frame 1. The vehicle seat frame 1 has a seat cushion frame 10, a seat back frame 20, and a connecting bracket 30 as its main components. The vehicle seat frame 1 is fixed via a height adjustment mechanism 40 to an upper rail UR of a slide rail mechanism that slides the vehicle seat S1 in the front-rear direction.

[0029] The seat cushion frame 10 has cushion side frames 11 as side frames, a pan frame 12, a front pipe 13 as connecting pipes, and a rear pipe 14.

[0030] The cushion side frames 11 are arranged one on each side of the seat cushion frame 10. The cushion side frames 11 extend in the front-rear direction.

[0031] An actuator 15 for operating the movable parts (a driving link 41 and a driven link 42, which will be described later) of the height adjustment mechanism 40 is attached to the outer side surface of the left cushion side frame 11.

[0032] The left cushion side frame 11 is provided with a cover fixing portion 117. The cover fixing portion 117 can fix the cover material S2b of the seat cushion S2 by engaging with an engaged portion formed on the cover material S2b. The cover fixing portion 117 will be described in detail later.

[0033] The pan frame 12 and the front pipe 13 are interposed between the front ends of the left and right cushion side frames 11 and connect the left and right cushion side frames 11 together. The pan frame 12 is connected at the front side to the upper and side surfaces of the cushion side frame 11. The pan frame 12 is joined to the cushion side frame 11 at pan frame joints 112a (see FIG. 4) and serves to improve the strength of the cushion side frame 11 against impacts during a rear-end collision.

[0034] The rear pipe 14 is a pipe-shaped body that is interposed between the left and right cushion side frames 11 on the rear side of the cushion side frames 11. The rear pipe 14 connects the left and right cushion side frames 11 together.

[0035] Next, the seat back frame 20 has a back side frame 21, an upper frame 22, and a lower frame 23. The back side frame 21, the upper frame 22, and the lower frame 23 are each made of a plate-like member. The back side frames 21 are disposed one on each side of the seat back frame 20. The back side frames 21 extend in the up-down direction.

[0036] The upper frame 22 connects the upper ends of the left and right back side frames 21. The lower frame 23 connects the lower ends of the left and right back side frames 21. The upper frame 22 and the lower frame 23 extend in the left-right direction.

[0037] The connecting brackets 30 are attached to the rear end portions of the cushion side frames 11 and the lower end portions of the back side frames 21. The connecting brackets 30 are arranged one on each side, and connect the back side frames 21 to the cushion side frames 11 in a rotatable manner.

[0038] <<About the height adjustment mechanism 40>> The height adjustment mechanism 40 will be described below with reference to Figures 3A and 3B. Figures 3A and 3B are views of the height adjustment mechanism 40 as seen from the inside in the left-right direction. The height adjustment mechanism 40 is disposed between the seat cushion frame 10 and the upper rail UR in the vertical direction. When an occupant performs a height adjustment operation (for example, by pressing an up / down button not shown), the actuator 15 operates a movable part of the height adjustment mechanism 40. This adjusts the height of the vehicle seat S1 including the seat cushion S2.

[0039] The height adjustment mechanism 40 has a driving link 41 located at the rear and a driven link 42 located at the front. The driving link 41 and the driven link 42 form a pair to adjust the height of the vehicle seat S1.

[0040] The drive link 41 is made of a metal plate member and has an elongated shape. One longitudinal end of the drive link 41 is supported on the upper rail UR so as to be swingable about a first swing shaft 41a. The other longitudinal end of the drive link 41 is connected to the actuator 15 via a gear (not shown) and is attached to the cushion side frame 11 so as to be swingable about a second swing shaft 41b.

[0041] The driven link 42 is made of a metal plate member and has an elongated shape. The driven link 42 is a link member that swings following the swinging motion of the drive link 41. One longitudinal end of the driven link 42 is supported on the upper rail UR so as to be swingable around a third swing shaft 42a. The other longitudinal end of the driven link 42 is attached to the cushion side frame 11 so as to be swingable around a fourth swing shaft 42b.

[0042] The operation of the height adjustment mechanism 40 configured as above will be described below. When an occupant in the seat performs a height adjustment operation, the actuator 15 is driven, and the driving link 41, which is engaged with the driving link 41 via a gear, and the driven link 42, which is paired with the driving link 41, swing. As a result, the cushion side frame 11 moves up and down between the raised position shown in Fig. 3A and the lowered position shown in Fig. 3B, thereby adjusting the height of the vehicle seat S1.

[0043] <<About Cushion Side Frame 11>> Next, the cushion side frame 11 will be described with reference to FIGS. 4 shows a side view of the cushion side frame 11 as seen from the outside in the left-right direction. The cushion side frame 11 has a plate-shaped frame main body 111 extending in the front-rear direction, an upper flange 112 extending in the front-rear direction at the upper edge of the frame main body 111, and a lower flange 113 extending in the front-rear direction at the lower edge of the frame main body 111.

[0044] The frame main body 111 is formed with a first connecting hole 114 that connects to the front pipe 13, a second connecting hole 115 that connects to the second pivot shaft 41b, and a third connecting hole 116 that connects to the rear pipe 14 and the fourth pivot shaft 42b. The cover fixing portion 117 described above is provided between the second connecting hole 115 and the third connecting hole 116 of the frame main body 111. In addition, the frame main body 111 is formed with a bracket fixing hole 118 on its rear side that fixes the connecting bracket 30.

[0045] The upper flange 112 is formed on the upper edge of the frame main body 111 over the entire longitudinal length of the frame main body 111. The upper flange 112 is joined to the pan frame 12 at a pan frame joint 112a on the front side thereof, thereby fixing the pan frame 12.

[0046] The lower flange 113 is formed on the lower edge of the frame main body 111 over the entire length of the frame main body 111 in the longitudinal direction. The lower flange 113 has a curved portion 113b that curves upward at its rear side. The rear end portion 113c of the lower flange 113 is located at the upper end of the curved portion 113b. The rear end portion 113c of the lower flange 113 is formed at a position that overlaps with the cover fixing portion 117 and the actuator 15 in the height direction.

[0047] Fig. 5 shows a VV cross-sectional view of Fig. 4. As shown in Fig. 5, the upper flange 112 has a bent portion 112b and a flat portion 112c. The bent portion 112b bulges outward in the left-right direction from the upper edge of the frame main body 111 and is bent so as to be folded back inward in the left-right direction. The flat portion 112c extends approximately horizontally inward in the left-right direction from the bent portion 112b.

[0048] Like the upper flange 112, the lower flange 113 has a bent portion 113d and a flat portion 113e. The bent portion 113d bulges outward in the left-right direction from the lower edge of the frame main body 111 and is bent back inward in the left-right direction. The flat portion 113e extends approximately horizontally from the bent portion 113d inward in the left-right direction.

[0049] Returning to FIG. 4, the cushion side frame 11 is provided on its side surface, rearward of the pan frame 12, with a cover fixing portion 117 for fixing the cover material S2b of the seat cushion S2. Fig. 6 is an enlarged perspective view of the cover fixing portion 117. Fig. 7 is a cross-sectional view taken along line VII-VII of Fig. 4. As shown in Figs. 6 and 7, the cover fixing portion 117 has an opening 117a and an engagement piece 117d that protrudes outward in the left-right direction from the upper edge of the opening 117a. The opening 117a is sandwiched between the upper flange 112 and the lower flange 113 and penetrates the frame main body 111. The opening 117a has a substantially rectangular shape.

[0050] The engagement piece 117d has an extension 117e, a protrusion 117f, and a tip 117g. The extension 117e extends downward from approximately the center in the front-to-rear direction of the upper edge of the opening 117a. The lower end of the extension 117e is formed with a protrusion 117f that is bent so as to protrude outward in the left-to-right direction from the extension 117e, and a tip 117g that extends downward from the protrusion 117f.

[0051] The upholstery material S2b can be fixed to the cushion side frame 11 by engaging the protruding portion 117f and the tip portion 117g that protrude outward in the left-right direction from the frame main body 111 with an engaging portion (not shown) formed on the inside of the upholstery material S2b. Also, an engaged portion (not shown) formed on the inside of a seat cover S5 provided on the side of the seat cushion S2 may be engaged with the engaging piece 117d. As a result, the seat cover S5 covers the seat cushion frame 10 from the outside and is fixed to the cushion side frame 11. The upholstery material S2b and the seat cover S5 correspond to a cover member.

[0052] The cover fixing portion 117 has an opening 117a formed by cutting out the frame main body 111 and has an engaging piece 117d formed by bending, but is not limited to this. The cover fixing portion 117 may have the opening 117a, and an engaged portion (not shown) formed on the inside of the upholstery material S2b or the seat cover S5 may be fixed to the opening 117a.

[0053] 4, the cushion side frame 11 is joined to the pan frame 12 at its front side, and its rigidity is increased by the pan frame 12. In other words, the cushion side frame 11 has a reinforced region R1 at its front side where the rigidity is increased by the pan frame 12.

[0054] The reinforced region R1 is formed by joining to the pan frame 12, but is not limited to this. For example, the reinforced region R1 may be formed by performing bead processing (string processing) on ​​the cushion side frame 11. Alternatively, the cushion side frame 11 may be provided with a reinforcing structure such as a honeycomb-shaped uneven structure. The reinforced region R1 has sufficient rigidity to withstand the impact of a rear collision. Therefore, even if a reinforcing portion 119 (described later) is formed in the reinforced region R1 to improve occupant protection, the effect is limited.

[0055] In addition, an opening 117a of the cover fixing portion 117 is formed on the side surface of the cushion side frame 11, rearward of the pan frame 12. In other words, the cushion side frame 11 has a weakened region R2, the rigidity of which is reduced by the opening 117a, behind the reinforced region R1.

[0056] The weakened region R2 deforms when an impact is applied during a rear collision, thereby absorbing the impact. Therefore, if a reinforcing portion 119 (described later) is formed in the weakened region R2, the impact absorption performance of the cushion side frame 11 may be impaired. The weakened region R2 is formed by, but not limited to, providing an opening 117a of the cover fixing portion 117 in the frame main body 111. For example, the weakened region R2 may be formed by providing a weight-reducing hole for reducing the weight of the cushion side frame 11.

[0057] The cushion side frame 11 has a reinforcing region R3 at a position different from the strengthened region R1 and the weakened region R2. The reinforcing region R3 is formed behind the weakened region R2. A reinforcing portion 119 is formed in the reinforcing region R3. In other words, the reinforcing region R3 is a region where the rigidity of the cushion side frame 11 can be effectively improved by forming the reinforcing portion 119.

[0058] By forming the reinforcing portion 119 in the reinforced region R3, the protection of the occupant can be improved. On the other hand, the reinforcing portion 119 is not formed in the strengthened region R1 and the weakened region R2. This reduces the manufacturing cost of the cushion side frame 11 compared to when the reinforcing portion 119 is formed over the entire length of the cushion side frame 11.

[0059] <<About the reinforcement part 119>> Next, the reinforcing portion 119 will be described. The reinforcing portion 119 is formed on a portion of the upper flange 112 and the lower flange 113. More specifically, the reinforcing portion 119 is formed in a reinforcing region R3 of the upper flange 112, which extends in the front-rear direction. In other words, the reinforcing portion 119 is formed in a portion of the upper flange 112 that is located rearward of the rear end portion 117c of the opening 117a of the cover fixing portion 117.

[0060] Further, the reinforcing portion 119 is formed in a reinforcing region R3 of the lower flange 113 extending in the front-rear direction. In other words, the reinforcing portion 119 is formed in a portion of the lower flange 113 that is located rearward of the rear end portion 117c of the opening 117a.

[0061] The front end 119a of the reinforcing portion 119 formed on the upper flange 112 and the front end 119a of the reinforcing portion 119 formed on the lower flange 113 are at the same position in the front-to-rear direction and are formed at the rear end of the weakened region R2. This makes it possible to suitably increase the rigidity of the cushion side frame 11 up to the rear end of the weakened region R2 (the front end 119a of the reinforcing portion 119).

[0062] The reinforcing portion 119 is formed by embossing the upper flange 112 and the lower flange 113. In other words, the reinforcing portion 119 is in a work-hardened state due to the embossing. Fig. 8 is a partially enlarged view of the flat portion 112c of the upper flange 112 on which the reinforcing portion 119 is formed. As shown in Fig. 8, the flat portion 112c has a plurality of circular protrusions 119b formed thereon, which are regularly arranged at predetermined intervals. By forming the plurality of protrusions 119b arranged regularly in this manner, it is possible to produce a uniform reinforcing effect on the upper flange 112 and the lower flange 113 without unevenness.

[0063] Here, the shape of the protrusions 119b is not limited to the circular shape shown in Fig. 6. The protrusions 119b may have a polygonal shape. For example, the reinforcing portion 119 may have a tortoiseshell pattern due to the protrusions 119b having a regular hexagonal shape.

[0064] The reinforcing portion 119 is formed on the bent portion 112b and the flat portion 112c of the upper flange 112. By forming the reinforcing portion 119 on both the bent portion 112b and the flat portion 112c of the upper flange 112, the reinforcing portion 119 can be formed over a wider area. This makes it possible to enhance the reinforcing effect of the reinforcing portion 119. Similarly, the reinforcing portion 119 is formed on the bent portion 113d and the flat portion 113e of the lower flange 113. By forming the reinforcing portion 119 on both the bent portion 113d and the flat portion 113e of the lower flange 113, the reinforcing portion 119 can be formed over a wide area. This makes it possible to enhance the reinforcing effect of the reinforcing portion 119.

[0065] Furthermore, the reinforcing portion 119 may be formed by hardening the upper flange 112 and the lower flange 113. For hardening, for example, induction hardening or laser hardening can be adopted. Furthermore, the reinforcing portion 119 may be formed by providing reinforcing ribs on the upper flange 112 and the lower flange 113. Furthermore, the reinforcing portion 119 may be formed by increasing the plate thickness of the upper flange 112 and the lower flange 113.

[0066] Returning to Fig. 4, the reinforcing portion 119 formed on the lower flange 113 extends rearward, bends at the curved portion 113b, and extends upward in the reinforcement region R3. The rear end portion 113c is formed at a position that overlaps in the up-down direction with the opening 117a and the engagement piece 117d formed in the cushion side frame 11. This increases the rigidity of the cushion side frame 11 in the up-down direction. It also makes it possible to prevent the engagement piece 117d from being deformed by an impact during a rear-end collision.

[0067] <<First Modification>> The configuration of a vehicle seat S1 according to one embodiment of the present invention has been described above, but the above-described embodiment is merely an example for facilitating understanding of the present invention and is not intended to limit the present invention. In other words, the present invention may be modified or improved without departing from the spirit thereof, and the present invention naturally includes equivalents thereof.

[0068] A reinforcing portion 119A according to a first modified example will be described with reference to Fig. 9. In the above-described embodiment, the reinforcing portion 119 is described as being formed rearward of the rear end portion 117c of the opening 117a. In contrast, the reinforcing portion 119A according to the first modified example is formed at a position that vertically overlaps the opening 117a and rearward of the front end portion 117b of the opening 117a. This makes it possible to realize a cushion side frame 11 that has appropriate characteristics and is well-balanced with respect to the conflicting properties of the impact absorption property of the weakened region R2 and the impact resistance due to the rigidity of the reinforced region R3.

[0069] <<Second Modification>> Next, a reinforcing portion 119B according to a second modified example will be described with reference to Fig. 10. In the above-described embodiment, the reinforcing portion 119 is described as being formed on the upper flange 112 and the lower flange 113. In contrast, the reinforcing portion 119B according to the second modified example is formed only on the lower flange 113. In this way, by forming the reinforcing portion 119B only on the lower flange 113, it is possible to increase the rigidity of the cushion side frame 11 and reduce the manufacturing cost of the cushion side frame 11. This makes it possible to achieve both improved protection for the occupant and cost reduction.

[0070] <<Other variations>> In the above-described embodiment, the reinforced region R1 is formed in front of the cushion side frame 11, the weakened region R2 is formed behind the reinforced region R1, and the reinforcing region R3 is formed further behind the weakened region R2. However, the present invention is not limited to this. The reinforced region R1, the weakened region R2, and the reinforcing region R3 may be formed in different positions. Furthermore, the cushion side frame 11 may be formed with a plurality of reinforced regions R1, weakened regions R2, and reinforced regions R3.

[0071] In the above-described embodiment, the reinforcing portions 119 are formed on the bent portion 112b and the flat portion 112c of the upper flange 112, but the present invention is not limited to this. The reinforcing portions 119 may be formed on only one of the bent portion 112b and the flat portion 112c. Similarly, the lower flange 113 has been described as having the reinforcing portions 119 formed on both the bent portion 113d and the flat portion 113e, but the reinforcing portions 119 may be formed on only one of them. Furthermore, the reinforcing portion 119 may be formed not only on the upper flange 112 and the lower flange 113 but also on the frame main body 111 .

[0072] In the above-described embodiment, the bent portion 112b of the upper flange 112 and the bent portion 113d of the lower flange 113 are described as bulging outward in the left-right direction, but the present invention is not limited to this. The bent portions 112b, 113d may be shaped to bend inward in the left-right direction without bulging outward in the left-right direction from the frame main body 111. Furthermore, the upper flange 112 and the lower flange 113 may not have the flat portions 112c, 113e, and may only have the approximately C-shaped bent portions 112b, 113d.

[0073] In the above-described embodiment, a vehicle seat S1 used in an automobile is used as an example of a vehicle seat, but the present invention is not limited to this and can also be applied to other vehicle seats, such as seats used in ships and aircraft. [Explanation of symbols]

[0074] 1. Vehicle seat frame 10 Seat cushion frame 11 Cushion side frame 111 Frame body 112 Upper flange 112a Pan frame joint 112b Bent part 112c flat part 113 Lower flange 113b Curved section 113c Rear end 113d Bend part 113e Flat area 114 First connection hole 115 Second connection hole 116 Third connecting hole 117 Cover fixing part 117a aperture 117b Front end 117c Rear end 117d Engagement piece 117e extension 117f Projection 117g tip 118 Bracket fixing hole 119, 119A, 119B Reinforcement part 119a Forward end 119b Convex part 12 Pan Frame 13 Front pipe 14 Rear pipe 15 Actuators 20 Seat back frame 21 Backside Frame 22 Upper frame 23 Lower frame 30 Connecting bracket 40 Height adjustment mechanism 41 Active Link 41a First swing axis 41b Second swing axis 42 driven link 42a Third swing axis 42b Fourth swing axis S1 Vehicle seats (vehicle seats) S2 seat cushion S2a Pad S2b Skin material (cover material) S3 seat back S4 headrest S5 seat cover (cover material) UR Upper Rail R1 reinforcement area R2 weakened area R3 reinforcement area

Claims

1. A vehicle seat including a seat cushion frame and a cover member that covers the seat cushion frame from the outside, The seat cushion frame includes cushion side frames extending in the front-rear direction, The cushion side frame is a cover fixing portion having an opening penetrating the cushion side frame and an engagement piece that engages with the cover member; a flange formed on an edge of the cushion side frame in the up-down direction and extending in the front-rear direction along the cushion side frame; a reinforcing portion formed in a portion of the flange that is positioned rearward of a front end portion of the opening, The vehicle seat, wherein the reinforcing portion is formed only at a position rearward of the front end portion of the opening.

2. 2. The vehicle seat according to claim 1, wherein the reinforcing portion is positioned at the same vertical position as the opening.

3. The flange includes an upper flange extending in the front-rear direction at an upper edge of the cushion side frame and a lower flange extending in the front-rear direction at a lower edge of the cushion side frame, 3. The vehicle seat according to claim 1, wherein the reinforcing portion is formed on the upper flange and the lower flange.

4. 4. The vehicle seat according to claim 3, wherein a front end portion of the reinforcing portion formed on the upper flange and a front end portion of the reinforcing portion formed on the lower flange are positioned at the same position in the front-to-rear direction.

5. A pan frame is installed on the front end side of the cushion side frame, 3. The vehicle seat according to claim 1, wherein the cover fixing portion is formed at a position between the pan frame and the reinforcing portion in the front-rear direction.

6. the flange has a bent portion that bulges outward in the left-right direction from an edge portion in the up-down direction and is bent inward so as to be folded back, and a flat portion that extends approximately horizontally inward in the left-right direction, 3. The vehicle seat according to claim 1, wherein the reinforcing portion is formed in the bent portion and the flat portion.

7. A vehicle seat including a seat cushion frame and a cover member that covers the seat cushion frame from the outside, The seat cushion frame includes cushion side frames extending in the front-rear direction, The cushion side frame is a cover fixing portion having an opening penetrating the cushion side frame and an engagement piece that engages with the cover member; a flange formed on an edge of the cushion side frame in the up-down direction and extending in the front-rear direction along the cushion side frame; a reinforcing portion formed in a portion of the flange that is positioned rearward of a front end portion of the opening, A pan frame is installed on the front end side of the cushion side frame, The vehicle seat is characterized in that the cover fixing portion is formed at a position between the pan frame and the reinforcing portion in the front-rear direction.

Images