Sheet

Abstract

To achieve weight saving of a seat, and allow a seat frame to secure strength required as a skeleton of the seat.SOLUTION: A seat has a skeleton which is constituted by seat frames 1 (3, 2) having a pair of left and right side frames 30, 31 / 20, 21, and connection frames 32, 33 / 22, 23 connecting the pair of left and right side frames 30, 31 / 20, 21. One plate member constituting each of the side frames 30, 31 / 20, 21 has a plurality of portions which are aligned and integrally formed in a direction orthogonal to an extension direction of the side frames 30, 31 / 20, 21 in a side view, and are set to different thicknesses.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a seat having a skeleton formed by a seat frame.

Background Art

[0002] Conventionally, for example, as described in Patent Document 1, a cushion side frame is known which is formed by press-working a tailored blank material formed by butt-welding and linearly welding the ends of two plate materials (thick plate material and thin plate material) having different thicknesses.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional cushion side frames have thin plate materials, which are advantageous in achieving weight reduction, miniaturization, and space saving of the seat. However, since the thicknesses of the plate materials forming the tailored blank material are different and the ends of these plate materials are joined by linear welding, it has been difficult to achieve a balance between the strength required as the skeleton of the seat and weight reduction.

[0005] The present invention has been made in view of the above circumstances, and the problem is to be able to achieve weight reduction of the seat and ensure that the seat frame can secure the strength required as the skeleton of the seat.

Means for Solving the Problems

[0006] In order to solve the above problems, the invention according to claim 1 is a seat in which a skeleton is constituted by a seat frame having a pair of left and right side frames and a connecting frame connecting the pair of left and right side frames, the side frame is provided with a reinforcing portion for reinforcing the side frame, each plate member constituting each side frame is integrally formed side by side in a direction orthogonal to the extending direction of the side frame in a side view, and has a plurality of portions set to different thicknesses, among the plurality of portions set to different thicknesses, the portion having a thinner thickness is provided in the reinforcing portion, the reinforcing portion is a concave portion formed in a state of being recessed from the front surface to the back surface of the side frame, and a bottom plate portion constituting the bottom surface of the concave portion is the portion having the thinner thickness, and the vertical wall portion that constitutes the side surface of the concave portion is the thickest portion among the plurality of portions set to different thicknesses characterized in that.

[0008] Claim 2 The invention according to claim 1 is the seat according to claim characterized in that the reinforcing portion is formed to be long along the extending direction of the side frame.

[0011] Claim 3 The invention according to claim 1 or 2 is the seat according to claim characterized in that the side frame is provided with a plurality of convex portions arranged side by side on one side and the other side in a direction orthogonal to the extending direction of the side frame with respect to the concave portion, and the plate portions constituting the plurality of convex portions are the portions having a thicker thickness among the plurality of portions set to different thicknesses.

[0012] Claim 4 The invention according to claim 3 is the seat according to claim Of the plurality of convex portions, the convex portion disposed closer to the occupant has a dimension in a direction orthogonal to the extending direction of the side frame set to be longer than that of the convex portion disposed farther from the occupant.

[0013] Claim 5 The invention according to any one of claims 1 to 4 In the seat according to any one of the above, The seat frame is a seat back frame that constitutes the skeleton of the seat back that serves as a backrest, The pair of left and right side frames are a pair of back side frames in the seat back frame, and are formed to extend in the vertical direction.

[0014] Claim 6 The invention according to any one of claims 5 In the seat according to any one of the above, The connecting frame includes an upper frame that connects the upper ends of the pair of left and right back side frames, The upper end portion of the reinforcing portion is disposed at a height position close to the lower end portion of the upper frame.

[0015] Claim 7 The invention according to any one of claims 1 to 4 In the seat according to any one of the above, The seat frame is a seat cushion frame that constitutes the skeleton of the seat cushion that supports a person's buttocks and thighs, The pair of left and right side frames are a pair of cushion side frames in the seat cushion frame, and are formed to extend in the front-rear direction.

Effect of the Invention

[0016] According to the invention described in claim 1, for one plate member constituting the side frame, a thick portion and a thin portion are integrally formed side by side in a direction orthogonal to the extending direction of the side frame. Therefore, the weight reduction of the seat can be achieved by the thin portion, and the seat frame can secure the strength required as the skeleton of the seat by the thick portion. In addition, since a thin portion is provided in the reinforcing portion that reinforces the side frame, it is easy to achieve both weight reduction and reinforcement of the seat. Furthermore, since the bottom plate portion that constitutes the bottom surface of the concave portion formed in a concave state from the front surface to the back surface of the side frame is a thin portion, while reducing the weight of the seat by this bottom plate portion, the bottom plate portion is not easily affected by impacts from the side. In addition, since the vertical wall portion that constitutes the side surface of the concave portion is the thickest portion among the plurality of portions set to different thicknesses, even if the bottom plate portion that constitutes the bottom surface of the concave portion is a thin portion, the concave portion can function as a reinforcing portion.

[0018] Claim 2 According to the invention described in claim, the side frame can be strengthened over its extending direction by a reinforcing portion formed longitudinally along the extending direction of the side frame.

[0021] Claim 3 According to the invention described in claim, for the concave portion, the plate portions constituting a plurality of convex portions arranged side by side on one side and the other side in a direction orthogonal to the extending direction of the side frame are thick portions. Therefore, the periphery of the concave portion including the thin portion can be strengthened.

[0022] Claim 4 According to the invention described in claim, the convex portion closer to the occupant, which is set to have a longer dimension in the direction orthogonal to the extending direction of the side frame than the convex portion farther from the occupant, can more effectively support the load of the occupant. Conversely, the convex portion farther from the occupant has a shorter dimension in the direction orthogonal to the extending direction of the side frame than the convex portion closer to the occupant, thus contributing to the weight reduction and miniaturization of the side frame.

[0023] Claim 5 According to the invention described in claim, for one plate member constituting the back side frame, a thick portion and a thin portion are integrally formed side by side in the front-rear direction. Therefore, while attempting to reduce the weight of the seat by the thin portion, it becomes easier to effectively support the load on the occupant's rear.

[0024] Claim 6According to the invention described in [reference], since the upper end portion of the reinforcing portion is disposed at a height position close to the lower end portion of the upper frame, the reinforcing portion can reinforce up to a relatively high position of the backside frame. As a result, the portion of the backside frame where the reinforcing portion is formed is less likely to deform even when receiving an impact from the side, for example, and thus can contribute to the protection of a portion (e.g., the chest) at a high position of the upper body of the occupant.

[0025] Claim 7 According to the invention described in [reference], with respect to one plate member constituting the cushion side frame, a thick portion and a thin portion are integrally formed side by side in the vertical direction. Therefore, while reducing the weight of the seat by the thin portion, it becomes easier to effectively support the load on the occupant downward.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0027] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, although various technically preferable limitations are imposed on the embodiments described below for carrying out the present invention, the technical scope of the present invention is not limited to the following embodiments and illustrated examples.

[0028] In FIG. 1 and the like, reference numeral 1 indicates a seat frame. This seat frame 1 serves as the skeleton of a seat including a seat cushion that supports a person's buttocks and thighs, a seat back that serves as a backrest, and a headrest that supports a person's head. The seat includes seats for furniture, and seats for vehicles such as ships and airplanes, but mainly refers to vehicle seats. Vehicles include not only automobiles (passenger cars), but also construction vehicles, military vehicles, industrial vehicles, railway vehicles, agricultural vehicles, etc.

[0029] As shown in FIGS. 1 and 2, the seat frame 1 includes a seat cushion frame 2 that constitutes the skeleton of the seat cushion, a seat back frame 3 that constitutes the skeleton of the seat back, and a headrest frame (not shown) that constitutes the skeleton of the headrest.

[0030] 〔Regarding the seat back frame〕 A cushion pad (not shown) is provided in front of the seat back frame 3, and the seat back frame 3 and the cushion pad are covered by a skin (not shown) that constitutes the surface of the seat back.

[0031] The seat back frame 3 is mainly composed of a pair of left and right back side frames 30, 31, an upper frame 32 that connects the upper end portions of the respective back side frames 30, 31, and a lower frame 33 that connects the lower end portions of the respective back side frames 30, 31.

[0032] The pair of left and right back side frames 30, 31 are formed to be long in the vertical direction, and are connected to the seat cushion frame 2 via a reclining mechanism 4 at the lower end portions. Details of the pair of left and right back side frames 30, 31 will be described later.

[0033] The upper frame 32 is formed by sheet metal working of a metal plate, and the left and right end portions are welded and joined to the upper end portions of the pair of left and right back side frames 30, 31 (welding portion WP). This upper frame 32 has a rear plate 32a located at the rear side and a front plate 32b located at the front side. The rear plate 32a has its upper and lower ends at the left and right ends welded to the rear plate portion 30c at the upper ends of the pair of left and right backside frames 30 and 31. The front plate 32b is integrally formed so as to bulge forward from the front surface of the rear plate 32a. Also, the left and right ends of the front plate 32b are welded to the front plate portions 30b at the upper ends of the pair of left and right backside frames 30 and 31. Furthermore, at the upper end of the front plate 32b, an insertion hole portion 32c into which a headrest guide for holding the headrest pillar of the headrest is inserted is formed.

[0034] The lower frame 33 is formed by bending a metal plate, and the left and right ends are welded and joined to the rear side of the lower ends of the pair of left and right backside frames 30 and 31 (welding portion WP). Also, the lower frame 33 has a shape that curves from the rear to the front in a side view in accordance with the shape of the lower ends of the pair of left and right backside frames 30 and 31. The rear end of such a shaped lower frame 33 is welded to the rear plate portion 30c at the lower ends of the pair of left and right backside frames 30 and 31. Also, the front end thereof is welded to the front plate portion 30b at the lower ends of the pair of left and right backside frames 30 and 31.

[0035] 〔Regarding the backside frame〕 Since the pair of left and right backside frames 30 and 31 are formed symmetrically left and right, hereinafter, the left backside frame 30 will be described in detail, and the detailed description of the right backside frame 31 will be omitted.

[0036] As shown in FIG. 2, in the side view of the backside frame 30, the upper end portion is located more rearward than the lower end portion, and the central main body portion located between these upper and lower end portions is curved such that the front side portion bulges forward as shown in FIGS. 2 to 4.

[0037] In addition, the backside frame 30 in the present embodiment is formed by pressing a metal plate, and all parts are integrally formed. Further, the backside frame 30 may be formed by injection molding a material that can be injection molded, such as resin (an aluminum alloy may also be used).

[0038] The upper end portion of the backside frame 30 generally refers to the portion where the upper frame 32 is joined, and the lower end portion generally refers to the portion where the lower frame 33 is joined and the reclining mechanism 4 is provided. In other words, the main body portion located between the upper end portion and the lower end portion refers to the portion located between the upper frame 32 and the lower frame 33. Note that a lumbar support (not shown) for receiving the load on the occupant's waist and back is provided across the main body portions of the pair of left and right backside frames 30 and 31.

[0039] The backside frame 30 includes a side plate portion 30a, a front plate portion 30b integrally formed at the front edge portion of the side plate portion 30a, and a rear plate portion 30c integrally formed at the rear edge portion of the side plate portion 30a, and is formed in a substantially U-shaped cross section. Note that the upper end portion of the rear plate portion 30c is formed to be wide toward the inner side in the left-right direction, and has a wide portion 30d that receives the rear plate 32a of the upper frame 32 and to which the rear plate 32a is welded.

[0040] A concave portion 300 is formed in a portion of the side plate portion 30a corresponding to the main body portion of the backside frame 30 (the portion between the upper end portion and the lower end portion). In the present embodiment, there is one concave portion 300, which is formed in a long shape along the extension direction (i.e., the length direction) of the backside frame 30, but it is not limited thereto, and a plurality of concave portions may be formed at intervals in the length direction of the backside frame 30.

[0041] In addition, the backside frame 30 includes a plurality of convex portions 303 and 304 arranged side by side on one side and the other side in a direction orthogonal to the extension direction of the backside frame 30 with respect to the recessed portion 300. That is, the side plate portion 30a of the backside frame 30 is arranged in the order of the front convex portion 303, the recessed portion 300, and the rear convex portion 304 from the front to the rear.

[0042] The plurality of convex portions 303 and 304 are necessarily provided so as to have a concave-convex relationship with the recessed portion 300, and in a side view, they constitute a surface Rp (hereinafter referred to as a reference surface Rp) of the side plate portion 30a that is adjacent to the recessed portion 300 and where the recessed portion 300 is not formed.

[0043] The front convex portion 303 is integrally formed with the front plate portion 30b, and the rear convex portion 304 is integrally formed with the rear plate portion 30c. Also, the front convex portion 303 is arranged on the side closer to the occupant, and the rear convex portion 304 is arranged on the side farther from the occupant. And the front convex portion 303 is set to have a longer dimension in the direction (front-rear direction) orthogonal to the extension direction of the backside frame 30 than the rear convex portion 304. That is, the front convex portion 303 is formed wider than the rear convex portion 304 in a side view. Furthermore, the plurality of convex portions 303 and 304 are integrally formed at a position above the upper end portion of the recessed portion 300.

[0044] The recessed portion 300 located between the plurality of convex portions 303 and 304 is recessed toward the inner side in the left-right direction (the center side in the left-right direction of the seat), and as shown in FIGS. 3 to 5, it has a bottom plate portion 301 that constitutes the bottom surface Bt of the recessed portion 300 and a standing wall portion 302 that constitutes the side surface Sd of the recessed portion 300. Note that a plurality of through holes for attaching members constituting the reclining mechanism 4 and lumbar supports are formed in the bottom plate portion 301 that constitutes the bottom surface Bt of the recessed portion 300.

[0045] The bottom surface Bt of the recess 300 refers to the surface that is recessed (at a position inside in the left - right direction) with respect to the reference surface Rp formed by the plurality of convex portions 303 and 304. In other words, the outer surfaces in the left - right direction of the bottom plate portion 301 are the bottom surface Bt of the recess 300. In FIG. 5, the range indicated by the dashed - dotted line is the range of the bottom surface Bt of the recess 300.

[0046] The side surface Sd of the recess 300 refers to the surface located between the bottom surface Bt and the reference surface Rp. In other words, the surface on the side of the recess 300 (bottom surface Bt) of the standing wall portion 302 is the side surface Sd of the recess 300. The standing wall portion 302 is a portion formed by bending a plate portion that constitutes the plurality of convex portions 303 and 304 inward in the left - right direction.

[0047] The back - side frame 30 configured as described above is integrally formed with a plurality of portions arranged side - by - side in a direction orthogonal to the extending direction of the back - side frame 30 in a side view, and has a plurality of portions set to different thicknesses. Here, the plurality of portions set to different thicknesses refer to a thin - thickness portion and a thick - thickness portion whose thickness dimension is set longer than that of this thin - thickness portion. And, the thin - thickness portion in the present embodiment is the bottom plate portion 301 that constitutes the bottom surface Bt of the recess 300. More specifically, as shown in FIG. 5, the bottom plate portion 301 is set to have a thickness of 0.8 mm. On the other hand, the thick - thickness portions in the present embodiment are the standing wall portion 302 that constitutes the side surface Sd of the recess 300 and the plurality of convex portions 303 and 304 (the plate portion that constitutes the plurality of convex portions 303 and 304) that constitute the reference surface Rp in the side plate portion 30a. More specifically, as shown in FIG. 5, the standing wall portion 302 and the plate portion that constitutes the plurality of convex portions 303 and 304 are set to have a thickness of 1.0 mm. Furthermore, the length from the position of the reference surface Rp to the position of the bottom surface Bt (that is, the depth of the recess 300) is set to 1.0 mm or more in the present embodiment, but is not limited thereto and may be set to 1.0 mm or less. Note that the dimensional settings of the thin part and the thick part of the thickness are not limited to the above, and can be appropriately changed without departing from the gist of the present invention.

[0048] Since the concave portion 300 is formed by bending the standing wall portion 302 inward in the left - right direction as described above, it functions as a reinforcing portion for reinforcing the side plate portion 30a of the back - side frame 30. On the other hand, since the concave portion 300 has a bottom plate portion 301 which is a thin part, it contributes to the weight reduction of the back - side frame 30. That is, the back - side frame 30 achieves both weight reduction and reinforcement of the side plate portion 30a in the back - side frame 30 by the concave portion 300 composed of the bottom plate portion 301 and the standing wall portion 302.

[0049] In the corner portion formed by the side plate portion 30a and the rear plate portion 30c at the upper end portion of the back - side frame 30, a plurality of recessed portions 305 are formed at intervals in the vertical direction to reinforce the portion where the upper frame 32 is joined. Note that the recessed portion 305 located below among the plurality of recessed portions 305 is arranged at a height approximately the same as that of the wide portion 30d in the rear plate portion 30c. Also, the recessed portion 305 located below is positioned near the boundary between the upper end portion and the main body portion of the back - side frame 30.

[0050] A fitting opening 306 into which a member constituting the reclining mechanism 4 is fitted is formed at the lower end portion of the back - side frame 30. That is, the lower end portion of the concave portion 300 is located near the upper end portion of this fitting opening 306. On the other hand, the height position of the upper end portion of the concave portion 300 is arranged at a height position close to the lower end portion of the upper frame 32 as shown in FIG. 1 and the like. More specifically, the height position of the upper end portion of the concave portion 300 is set to be substantially equal to the height position of the lower end portion of the wide portion 30d where the lower end portion of the rear plate 32a in the upper frame 32 is welded. That is, the concave portion 300, which is the reinforcing portion, can reinforce up to a relatively high position of the backside frame 30. In the seat of this embodiment, a headrest will be provided above the upper frame 32. Considering that the headrest supports the head of the occupant, it is assumed that the upper frame 32 is at a height to support the neck and shoulders of the occupant. In view of this point, since the upper end portion of the concave portion 300 is at a height position substantially equal to the lower end portion of the upper frame 32, it will be located near the chest of the occupant. Therefore, the concave portion 300 reinforces the backside frame 30 over the height from the waist to the chest of the occupant.

[0051] In this embodiment, although a detailed description of the right backside frame 31 is omitted, the right backside frame 31 also has a central main body portion located between the upper end portion and the lower end portion, and the front side portion is curved so as to bulge forward, similar to the left backside frame 30. Further, the right backside frame 31 includes a side panel portion 31a, a front panel portion 31b, and a rear panel portion 31c having a wide portion 31d, and is formed in a substantially U-shaped cross section. Furthermore, a concave portion 300, which is a reinforcing portion, is formed at a portion corresponding to the main body portion of the right backside frame 31 in the side panel portion 31a, similar to the left backside frame 30. Note that the configuration of the concave portion 300 is the same (symmetric) as that of the concave portion 300 in the left backside frame 30, and reinforces the backside frame 30 over the height from the waist to the chest of the occupant.

[0052] 〔Regarding the seat cushion frame〕 A cushion pad (not shown) is provided on the seat cushion frame 2, and the seat cushion frame 2 and the cushion pad are covered by a skin (not shown) that constitutes the surface of the seat cushion.

[0053] The seat cushion frame 2 is mainly composed of a pair of left and right cushion side frames 20, 21, a back pipe frame 22 that connects the rear ends of the respective cushion side frames 20, 21, a front pipe frame 23 (i.e., the front frame) that connects the front ends of the respective cushion side frames 20, 21, and a pan frame 24 as a pressure-receiving member that receives the load of the occupant.

[0054] The pair of left and right cushion side frames 20, 21 are formed to be long in the front-rear direction and are connected to the seat back frame 3 via a reclining mechanism 4 at the rear end. The detailed configuration of these pair of left and right cushion side frames 20, 21 will be described later.

[0055] The back pipe frame 22 and the front pipe frame 23 are pipe materials. Since the back pipe frame 22 connects the rear ends of the pair of left and right cushion side frames 20, 21 that are curved upward, it is located above the front pipe frame 23.

[0056] The pan frame 24 is a pressure-receiving member made of a metal plate material that receives the load of the occupant and is located below the thigh of the occupant when seated in the normal driving position. Such a pan frame 24 is used in combination with another pan frame (not shown) spanned between the back pipe frame 22 and the front pipe frame 23, and a cushion pad is placed on their upper surfaces.

[0057] Below the seat cushion frame 2, a pair of left and right slide rails 25, 26 are provided that slide the seat cushion frame 2 to an arbitrary front-rear position with respect to the vehicle floor based on the operation of the occupant. The left slide rail 25 is attached to the left cushion side frame 20, and the right slide rail 26 is attached to the right cushion side frame 21. The slide rails 25 and 26 are provided with a locking mechanism for locking and unlocking the operation of these slide rails 25 and 26.

[0058] 〔Regarding the cushion side frame〕 In this embodiment, the pair of left and right cushion side frames 20 and 21 are not formed symmetrically left and right, but since they are functionally substantially the same, the following will describe the left cushion side frame 20, and the detailed description of the right cushion side frame 21 will be omitted.

[0059] As shown in FIGS. 1 and 2, the cushion side frame 20 is connected to the seat back frame 3 via the reclining mechanism 4 at the rear end, so this rear end is in a state of curving upward. And members constituting the reclining mechanism 4 are appropriately attached to the rear end.

[0060] In addition, the cushion side frame 20 in this embodiment is formed by pressing a metal plate, and all parts are integrally formed. Also, this cushion side frame 20 may be formed by injection molding a material that can be injection molded, such as resin (aluminum alloy may also be used).

[0061] The front end portion of the cushion side frame 20 generally refers to the portion where the front pipe frame 23 and the pan frame 24 are provided, and the rear end portion generally refers to the portion where the back pipe frame 22 and the reclining mechanism 4 are provided. The portion between such a front end portion and a rear end portion is the central portion of the cushion side frame 20 and is located between the back pipe frame 22 and the front pipe frame 23.

[0062] Further, the cushion side frame 20 includes a side plate portion 20a, an upper plate portion 20b integrally formed at the upper edge portion of the side plate portion 20a, and a lower plate portion 20c integrally formed at the lower edge portion of the side plate portion 20a, and is formed in a substantially U-shaped cross section.

[0063] A concave portion 200 is formed at a portion corresponding to the central portion of the cushion side frame 20 in the side plate portion 20a. In the present embodiment, there is one concave portion 200, which is formed in a long shape along the extension direction (i.e., the length direction: the front-rear direction) of the cushion side frame 20. However, the present invention is not limited thereto, and a plurality of concave portions may be formed at intervals in the length direction of the cushion side frame 20.

[0064] Further, the cushion side frame 20 includes a plurality of convex portions 203 and 204 arranged side by side on the upper side and the lower side in a direction orthogonal to the extension direction of the cushion side frame 20 with respect to the concave portion 200. That is, the side plate portion 20a of the cushion side frame 20 is arranged in the order of the upper convex portion 203, the concave portion 200, and the lower convex portion 204 from above to below.

[0065] The upper convex portion 203 is integrally formed with the upper plate portion 20b, and the lower convex portion 204 is integrally formed with the lower plate portion 20c. In the present embodiment, the dimension of the lower convex portion 204 in the direction orthogonal to the extension direction of the cushion side frame 20 (the vertical direction) is set to be longer than that of the upper convex portion 203.

[0066] The concave portion 200 located between the plurality of convex portions 203 and 204 is recessed inward in the left-right direction (the center side in the left-right direction of the seat), and has a bottom plate portion 201 constituting the bottom surface of the concave portion 200 and a standing wall portion 202 constituting the side surface of the concave portion 200.

[0067] Since the recess 200 is formed by bending the vertical wall portion 202 inward in the left - right direction, it functions as a reinforcing portion for reinforcing the side plate portion 20a of the cushion side frame 20. On the other hand, the recess 200 has a bottom plate portion 201 which is a thin - walled part. Therefore, the cushion side frame 20 achieves both weight reduction and reinforcement of the side plate portion 20a in the cushion side frame 20 by the recess 200 composed of the bottom plate portion 201 and the vertical wall portion 202.

[0068] In this embodiment, although a detailed description of the right - hand cushion side frame 21 is omitted, the rear end of this right - hand cushion side frame 21 is also curved upward in the same manner as the left - hand cushion side frame 20. Also, the right - hand cushion side frame 21 includes a side plate portion 21a, an upper plate portion 21b, and a lower plate portion 21c, and is formed in a substantially U - shaped cross - section. Furthermore, at a portion corresponding to the central part of the right - hand cushion side frame 21 in the side plate portion 21a, a recess 200, which is a reinforcing portion, is formed in the same manner as the left - hand cushion side frame 20. Note that the configuration of the recess 200 is the same as that of the recess 200 in the left - hand cushion side frame 20 and reinforces the right - hand cushion side frame 21.

[0069] 〔Effect of the seat in this embodiment〕 According to this embodiment, for one plate member constituting the pair of left - and - right back side frames 30, 31 in the seat back frame 3, a thick - walled part (the plate part constituting the vertical wall portion 302 and the convex portions 303, 304) and a thin - walled part (the bottom plate portion 301) are integrally formed side by side in a direction orthogonal to the extension direction of the back side frames 30, 31. Therefore, weight reduction of the seat can be achieved by the thin - walled part, and the seat back frame 3 can secure the strength required as the skeleton of the seat by the thick - walled part. Furthermore, the thick - walled part makes it easier to effectively support the load on the occupant's back.

[0070] In addition, with respect to one plate member that constitutes the pair of left and right cushion side frames 20 and 21 in the seat cushion frame 2, a thick portion (the plate portion that constitutes the standing wall portion 202 and the convex portions 203 and 204) and a thin portion (the bottom plate portion 201) are integrally formed side by side in a direction orthogonal to the extending direction of the cushion side frames 20 and 21. Therefore, the weight of the seat can be reduced by the thin portion, and the seat cushion frame 2 can secure the strength required as the framework of the seat by the thick portion. Furthermore, the thick portion makes it easier to effectively support the load on the occupant downward.

[0071] In particular, the pair of left and right side frames (the back side frames 30 and 31, the cushion side frames 20 and 21) in the present embodiment are constituted by one plate member and are integrally formed as a whole. Since the one plate member has a plurality of portions set to different thicknesses, for example, different from the case of joining a plurality of plate materials set to different thicknesses, it is easy to balance the strength and weight reduction required as the framework of the seat.

[0072] Also, since thin portions (the bottom plate portion 301, the bottom plate portion 201) are provided in the reinforcing portions (the recess 300, the recess 200) that reinforce the side frames (the back side frames 30 and 31, the cushion side frames 20 and 21), it is easy to achieve both weight reduction and reinforcement of the seat.

[0073] In addition, the side frames can be reinforced over their extending directions by the reinforcing portions (the recess 300, the recess 200) formed in a long shape along the extending direction of the side frames (the back side frames 30 and 31, the cushion side frames 20 and 21).

[0074] Also, since the bottom plate portions 301 and 201 that constitute the bottom surfaces Bt of the recesses 300 and 200 formed in a concave state from the front surface to the back surface of the side frames (the back side frames 30 and 31, the cushion side frames 20 and 21) are thin portions, while reducing the weight of the seat by the bottom plate portions 301 and 201, the bottom plate portions 301 and 201 are not easily subjected to impacts from the side.

[0075] In addition, since the vertical wall portions 302 and 202 that form the side surfaces of the recesses 300 and 200 are the thick portions among a plurality of portions having different thicknesses, even if the bottom plate portions 301 and 201 that form the bottom surfaces Bt of the recesses 300 and 200 are thin portions, the recesses 300 and 200 can function as reinforcing portions.

[0076] In addition, with respect to the recesses 300 and 200, the plate portions that form the plurality of convex portions 303, 304, 203, and 204 arranged side by side on one side and the other side in a direction orthogonal to the extending direction of the side frames (back side frames 30 and 31, cushion side frames 20 and 21) are thick portions. Therefore, the periphery of the recesses 300 and 200 including the thin portions (bottom plate portions 301 and 201) can be strengthened.

[0077] In addition, in the back side frames 30 and 31 of the seat back frame 3 in the present embodiment, the convex portion 303 closer to the occupant, in which the dimension in the direction orthogonal to the extending direction of the back side frames 30 and 31 is set longer than the convex portion 304 on the side farther from the occupant, can more effectively support the load of the occupant. Conversely, the convex portion 304 on the side farther from the occupant has a shorter dimension in the direction orthogonal to the extending direction of the back side frames 30 and 31 than the convex portion 303 on the side closer to the occupant, thus contributing to the weight reduction and miniaturization of the back side frames 30 and 31.

[0078] In addition, in the back side frames 30 and 31 of the seat back frame 3 in the present embodiment, since the upper end portion of the recess 300, which is a reinforcing portion, is arranged at a height position close to the lower end portion of the upper frame 32, the recess 300 can strengthen up to a relatively high position of the back side frames 30 and 31. As a result, the portion of the back side frames 30 and 31 where the recess 300 is formed is difficult to deform even when receiving an impact from the side, for example, and can contribute to the protection of the portion (for example, the chest) at a high position of the upper body of the occupant.

Description of Reference Numerals

[0079] 1 Seat frame 2 Seat cushion frame 3 Seat back frame 4 Reclining mechanism 20 Cushion side frame 20a Side panel part 20b Top panel part 20c Bottom panel part 21 Cushion side frame 21a Side panel part 21b Top panel part 21c Bottom panel part 30 Back side frame 30a Side panel part 30b Front panel part 30c Rear panel part 30d Wide part 31 Back side frame 31a Side panel part 31b Front panel part 31c Rear panel part 31d Wide part 32 Upper frame 32a Rear plate 32b Front plate 32c Insertion hole part 33 Lower frame 200 Recess 201 Bottom plate part 202 Standing wall part 203 Protrusion 204 Protrusion 300 Recess 301 Bottom plate part 302 Standing wall part 303 Protrusion 304 Protrusion 305 Depression part 306 Fitting opening part WP Welding part Bt Bottom surface Sd Side surface Rp Reference plane

Claims

1. A seat in which a skeleton is constituted by a seat frame having a pair of left and right side frames and a connecting frame that connects the pair of left and right side frames, The side frame is provided with a reinforcing portion that reinforces the side frame, One plate member constituting each of the side frames is integrally formed side by side in a direction orthogonal to the extending direction of the side frame in a side view, and has a plurality of portions set to different thicknesses, Among the plurality of portions set to different thicknesses, a portion with a thinner thickness is provided in the reinforcing portion, The reinforcing portion is a concave portion formed in a state of being recessed from the front surface to the back surface of the side frame, and a bottom plate portion constituting the bottom surface of the concave portion is the portion with the thinner thickness, A seat, wherein a standing wall portion constituting a side surface of the concave portion is a portion with a thicker thickness among the plurality of portions set to different thicknesses.

2. The seat according to claim 1, wherein the reinforcing portion is formed in a long shape along the extending direction of the side frame.

3. The side frame includes a plurality of convex portions arranged side by side on one side and the other side in a direction orthogonal to the extending direction of the side frame with respect to the concave portion, and a plate portion constituting the plurality of convex portions is a portion with a thicker thickness among the plurality of portions set to different thicknesses. The seat according to claim 1 or 2, characterized in that.

4. Among the plurality of convex portions, a convex portion arranged closer to the occupant has a dimension in a direction orthogonal to the extending direction of the side frame set longer than that of a convex portion arranged farther from the occupant. The seat according to claim 3, characterized in that.

5. The seat frame is a seat back frame that constitutes a skeleton of a seat back serving as a backrest, The pair of left and right side frames are a pair of back side frames in the seat back frame, and are characterized by extending in the vertical direction. The seat according to any one of claims 1 to 4.

6. The connecting frame includes an upper frame that connects the upper ends of the pair of left and right back side frames. The upper end of the reinforcing portion is disposed at a height position close to the lower end of the upper frame. The seat according to claim 5.

7. The seat frame is a seat cushion frame that constitutes the skeleton of a seat cushion that supports a person's buttocks and thighs. The pair of left and right side frames are a pair of cushion side frames in the seat cushion frame, and are characterized by extending in the front-rear direction. The seat according to any one of claims 1 to 4.

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