Vehicle seat reinforcement structure

Abstract

To more reliably prevent separation between a fixed rail and a movable rail in a horizontal slide rail. [Solution] The seat support part 5 has front and rear lateral sliding rails 50, 51, a plurality of foot brackets 52-55 provided on the left and right sides of each of the front and rear lateral sliding rails 50, 51, and a connecting member 56 connecting the foot brackets 52, 54 arranged at intervals in the front-to-rear direction on at least one of the left and right sides of the seat, and the peel prevention structure 6 has an upper peel prevention part 60 fixed to the cushion frame 2 side, and a lower peel prevention part 61 fixed to the rear foot bracket 54 of the front and rear foot brackets 52, 54 connected by the connecting member 56, and the upper peel prevention part 60 and the lower peel prevention part 61 engage with each other in a state where the cushion frame 2 can slide.

Description

[Technical field]

[0001] The present invention relates to a reinforcing structure for a vehicle seat. [Background technology]

[0002] Conventionally, in order to realize a variety of seat arrangements, slide rails have been used to allow vehicle seats to move not only in the fore-and-aft direction of the vehicle but also in the width direction. However, when a large load is applied during a collision or the like, separation can occur between the movable rail and the fixed rail in the lateral slide rail. Therefore, a technology is known, such as that described in Patent Document 1, in which a first anti-peeling member fixed to a connecting member connected to the seat cushion frame is engaged with a second anti-peeling member fixed to a foot bracket supporting the lateral sliding rail, thereby preventing detachment between the fixed rail and the movable rail in the lateral sliding rail. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-112041 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when adopting a technology for engaging the first peel-off prevention member and the second peel-off prevention member, there is a demand for a reinforcing structure that can further improve the fixing strength of the first peel-off prevention member and the fixing strength of the second peel-off prevention member, thereby more reliably preventing peeling between the fixed rail and the movable rail in the lateral slide rail.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to provide a reinforcing structure for a vehicle seat that can more reliably prevent separation between a fixed rail and a movable rail in a lateral slide rail. [Means for solving the problem]

[0006] In order to solve the above problems, the invention described in claim 1 is a reinforcing structure for a vehicle seat, comprising: a cushion frame forming a framework of a seat cushion that supports a person's thighs and buttocks; a seat support part that supports the cushion frame on a floor of a vehicle; and a peeling prevention structure provided between the cushion frame and the seat support part, The seat support portion is a front and rear lateral slide rail provided on the underside of the cushion frame, the front and rear lateral slide rail including a fixed rail and a movable rail, and configured to slide the cushion frame in the left and right direction; a foot bracket attached to a rear lateral slide rail of the front and rear lateral slide rails to support the cushion frame, The peel-off prevention structure is An upper peeling prevention part fixed to the cushion frame side; a lower peeling prevention portion fixed to the foot bracket, the upper peeling prevention portion and the lower peeling prevention portion are engaged with each other in a state in which the cushion frame can be slid by the front and rear lateral slide rails, The upper peeling prevention portion is fixed to a back pipe frame provided at a rear end portion of the cushion frame, The upper peeling prevention portion includes a fixing portion that is fixed to the back pipe frame and has left and right flange portions that protrude toward the back pipe frame, and the left and right flange portions are joined and fixed to the back pipe frame. 、 A mounting portion on which a child seat is mounted is welded to the back pipe frame, The upper peeling prevention portion is disposed behind the mounting portion and at substantially equal positions in the left-right direction. It is characterized by:

[0008] Claim 2 The invention described in claim 1 In the vehicle seat reinforcing structure described above, the upper peel-off prevention portion has a flange shape formed below the positions of the left and right flange portions of the fixing portion.

[0009] Claim 3 The invention described in claim 2 In the reinforcement structure for a vehicle seat described in the above, the left and right flanges of the fixing portion and the flange shape formed below the positions of the left and right flange portions of the fixing portion are integrally formed.

[0010] Claim 4 The invention described in claim 1 to 3 In the vehicle seat reinforcement structure described in any one of claims 1 to 5, the fixing portion is characterized in that a recess is formed in the left-right center of the fixing portion, which is recessed toward the back pipe frame.

[0011] Claim 5 The invention described in claim 4 In the vehicle seat reinforcement structure described above, the upper peel-off prevention portion is welded to the back pipe frame at the position of the central recess in the fixing portion and the left and right flange portions in the fixing portion.

[0012] Claim 6 The invention described in claim 5 In the vehicle seat reinforcing structure described in the above item 1, a mounting portion to which a child seat is mounted is welded to the back pipe frame, The welded points of the attached portion to the back pipe frame and the welded points at the positions of the left and right flange portions of the fixing portion of the upper peel-off prevention portion are located at approximately the same positions in the left-right direction.

[0013] Claim 7 The invention described in claim 1 to 6 In the vehicle seat reinforcing structure according to any one of claims 1 to 5, the lower engagement portion has an upper engagement portion for engaging with the upper peel-off prevention portion, the lower peeling prevention portion has a lower engagement portion that engages with the upper engagement portion of the upper peeling prevention portion, The upper engaging portion and the lower engaging portion are positioned to engage with each other, The upper engaging portion has a portion that engages with the lower engaging portion and is formed longer in the left-right direction than the fixing portion. Claim 8 The invention described in the above is a reinforcing structure for a vehicle seat, the reinforcing structure comprising: a cushion frame forming a framework of a seat cushion that supports a person's thighs and buttocks; a seat back frame that forms a framework of a seat back that serves as a backrest and has a lower end supported by the seat cushion; a seat support portion that supports the cushion frame on a floor of a vehicle; a peeling prevention structure provided between the cushion frame and the seat support portion; a cushion pad provided on the cushion frame and the seat back frame; and a skin that covers the cushion pad, The seat support portion is a front and rear lateral slide rail provided on the underside of the cushion frame, the front and rear lateral slide rail including a fixed rail and a movable rail, and configured to slide the cushion frame in the left and right direction; a foot bracket attached to a rear lateral slide rail of the front and rear lateral slide rails to support the cushion frame, The peel-off prevention structure is An upper peeling prevention part fixed to the cushion frame side; a lower peeling prevention portion fixed to the foot bracket, the upper peeling prevention portion and the lower peeling prevention portion are engaged with each other in a state in which the cushion frame can be slid by the front and rear lateral slide rails, The upper peeling prevention portion is fixed to a back pipe frame provided at a rear end portion of the cushion frame, The upper peeling prevention portion includes a fixing portion that is fixed to the back pipe frame and has left and right flange portions that protrude toward the back pipe frame, and the left and right flange portions are joined and fixed to the back pipe frame. 、 A mounting portion on which a child seat is mounted is welded to the back pipe frame, The upper peeling prevention portion is disposed behind the mounting portion and at substantially equal positions in the left-right direction. It is characterized by: Effect of the Invention

[0014] Claim 1, 8 According to the invention described in the above, the upper peel-off prevention part fixed to the cushion frame and the lower peel-off prevention part fixed to the rear foot bracket are engaged with each other in a state that allows the cushion frame to slide along the front and rear lateral slide rails, making it easier to prevent peeling between the fixed rail and the movable rail in the lateral slide rail. In addition, since the upper peel-off prevention part is fixed to the back pipe frame provided at the rear end of the cushion frame, it is easier to strengthen the fixing strength of the upper peel-off prevention part compared to, for example, a case in which the upper peel-off prevention part is fixed to a horizontal slide rail. Furthermore, the fixing portion of the upper peel-off prevention portion that is fixed to the back pipe frame has left and right flange portions that protrude toward the back pipe frame, and the left and right flange portions are joined and fixed to the back pipe frame, so that the portion is joined and fixed (welded) at the left and right positions, thereby improving the fixing strength to the back pipe frame.

[0015] Furthermore, claims 1 and 8 According to the invention described in the above, the rigidity of the back pipe frame in the vicinity of where the upper peel-off prevention portion and the mounting portion are provided can be improved, thereby improving the mounting state of the child seat mounted on the mounting portion.

[0016] Claim 2 According to the invention described in the above, the upper peel-preventing part can improve the rigidity in the part below the fixing part. This makes the upper peel-preventing part less likely to deform, and therefore makes it difficult for the upper peel-preventing part and the lower peel-preventing part to come out of engagement with each other.

[0017] Claim 3 According to the invention described in claim 2 The same effects as those of the invention described above can be obtained.

[0018] Claim 4 According to the invention described in the above, the cross section of the fixing portion can be increased by the recess, and the rigidity can be improved.

[0019] Claim 5 According to the invention described above, welding is performed at a plurality of positions, and the fixing strength to the back pipe frame can be improved.

[0020] Claim 6 According to the invention described above, the rigidity of the back pipe frame in the vicinity of where the upper peel-off prevention portion and the attached portion are welded can be improved, and the fixing strength of the upper peel-off prevention portion can be improved.

[0021] Claim 7 According to the invention described in the above, even when the cushion frame is slid left and right by the lateral slide rail, the engagement between the upper peel-off prevention portion and the lower peel-off prevention portion is unlikely to come loose. [Brief description of the drawings]

[0022] [Figure 1] FIG. 2 is a front perspective view showing a seat frame that constitutes the vehicle seat. [Diagram 2] FIG. 2 is a rear perspective view showing a seat frame that constitutes the vehicle seat. [Diagram 3] FIG. [Figure 4] FIG. 4 is a perspective view showing the vicinity of the front end side of the cushion frame. [Diagram 5] FIG. [Figure 6] 1 is a cross-sectional view showing the vicinity of an anchor point of a cushion side frame having a closed cross-sectional structure as viewed from the front side. [Figure 7] FIG. 4 is a perspective view showing the vicinity of the reclining mechanism in the left cushion side frame. [Figure 8] 11 is a perspective view showing an example in which the left and right cushion side frames have a closed cross-sectional structure. FIG. [Figure 9]1 is a perspective view showing the lower end portion of the left back side frame and the vicinity of the reclining mechanism. FIG. [Figure 10] 11 is a cross-sectional view of the lower end portion of the left back side frame as viewed from the front side. FIG. [Figure 11] 11 is a cross-sectional view of the lower end portion of the left back side frame as viewed from above. FIG. [Figure 12] 1A is a front view showing the lower end of the left back side frame and the vicinity of the reclining mechanism, and FIG. [Figure 13] FIG. 4 is a perspective view showing a second bracket. [Figure 14] 1A is a front view showing the second bracket, FIG. 1B is a rear view, and FIG. [Figure 15] FIG. 4 is a rear view showing the vicinity of the peel-off prevention structure. [Figure 16] FIG. 4 is a left side view showing the vicinity of the peel-off prevention structure. [Figure 17] FIG. 4 is a rear perspective view showing the vicinity of the peeling prevention structure. [Figure 18] 13 is a rear view showing an example in which front and rear foot brackets are connected by a plurality of connecting members. FIG. [Figure 19] FIG. 4 is a right side view showing a seat frame provided with an armrest. [Figure 20] FIG. 2 is a right side view showing a seat frame provided with an armrest, with the seat back frame in a reclined position. [Figure 21] FIG. 4 is a right side view showing the seat frame with the armrest in a stowed state. [Figure 22] 1 is a perspective view of an armrest provided on the right side as viewed from the left side. FIG. [Diagram 23] FIG. [Figure 24] 11 is a perspective view showing a modified example of a seat back frame in which the left and right back side frames have a closed cross-sectional structure. FIG. [Diagram 25] 13 is a perspective view showing a modified example of a seat back frame provided with a reinforcing frame. FIG. [Figure 26] 13 is a perspective view showing a modified example of a seat back frame provided with a plate-shaped back frame and a connecting frame. FIG. [Figure 27] 13 is a perspective view showing a modified example of the vicinity of the front end side of the cushion frame. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, the embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are subject to various technically preferable limitations for carrying out the present invention, but the technical scope of the present invention is not limited to the following embodiments and illustrated examples. In the following description, a portion joined by welding will be referred to as a welded portion W. In each drawing, the reference symbol W will be used for explanation.

[0024] First Embodiment 1 and 2, reference numeral 1 denotes a seat frame of a vehicle seat on which a person sits. This seat frame 1 includes a cushion frame 2 forming the framework of a seat cushion that supports the person's thighs and buttocks, a seatback frame 3 whose lower end is supported by the seat cushion and forms the framework of a seat back that serves as a backrest, a reclining mechanism 4 for tilting the seatback frame 3 relative to the cushion frame 2, a seat support part 5 that supports the vehicle seat on the floor, and a peeling prevention structure 6 that prevents the cushion frame 2 from peeling off from the seat support part 5. In the present embodiment, the vehicle seat is a seat for a passenger car, but is not limited thereto, and may be a seat for other automobiles such as a bus or truck, or a seat for vehicles other than automobiles such as a train, ship, or aircraft.

[0025] Although not shown, the seat frame 1 has a cushion pad provided on the cushion frame 2 and the seat back frame 3, and the cushion pad is covered with a cover to form a vehicle seat. Although not shown, the seat frame 1 is installed on the floor of the vehicle body via a pair of left and right front and rear slide rails for sliding (adjusting the position) the seat frame 1 in the front-rear direction of the vehicle body.

[0026] [About the cushion frame] As shown in Figures 1 to 7, the cushion frame 2 has left and right cushion side frames 20, 21 arranged at a distance from each other, a back pipe frame 22 connecting the rear ends of the left and right cushion side frames 20, 21, and a front pipe frame 23 connecting the front ends of the left and right cushion side frames 20, 21.

[0027] Of the left and right cushion side frames 20, 21, one of the cushion side frames 20 (the left side in this embodiment) is integrally formed as a hollow body with a closed cross-sectional structure (also called a monaka structure) by combining a left-side split body 20a and a right-side split body 20b, as shown in Figures 5 and 6.

[0028] The left divisional body 20a is formed to have a U-shaped cross section that is open toward the inside (right side). The tip of the upper flange 201 is bent downward to form a bent portion 201a. A reinforcing recess 200a that bulges inward and is recessed when viewed from the outer surface (left side surface) is formed in the longitudinal center of the web 200. As shown in Fig. 5, this reinforcing recess 200a is disposed in the vicinity of an anchor point 24 (described later) of a seat belt (not shown).

[0029] The right divisional body 20b is formed to have a U-shaped cross section that is open toward the outside (left side).

[0030] The web 200 in the left divisional body 20a and the web 203 in the right divisional body 20b face each other and are spaced apart from each other. The upper flange 201 of the left divisional body 20a and the upper flange 204 of the right divisional body 20b overlap with each other so that the upper flange 204 of the right divisional body 20b is on the upper side. Since the bent portion 201a is bent downward as described above, it is separated from the upper flange 204 of the right divisional body 20b. The lower flange 202 of the left divisional body 20a and the lower flange 205 of the right divisional body 20b overlap with each other such that the lower flange 205 of the right divisional body 20b is on the upper side.

[0031] The upper and lower flanges 201, 202 of the left divisional body 20a and the upper and lower flanges 204, 205 of the right divisional body 20b, which overlap each other, are joined by welding at a plurality of points (that is, welds W). When joining the upper flange 201 of the left section 20a and the upper flange 204 of the right section 20b by welding, the welding material (base material) may flow into the gap between the overlapping flanges 201, 204. In such a case, the flowed-in welding material can be received in the gap between the flanges 204 and the bent portion 201a, which are spaced apart from each other.

[0032] The front end of the left cushion side frame 20 is open forward so that a left end 23a of a front pipe frame 23, which will be described later, can be inserted therein. Further, the rear end portion of the left cushion side frame 20 opens upward so that the lower portion of a first bracket 41, which will be described later, can be inserted therein.

[0033] As shown in Fig. 5, an anchor point 24 (fixing point) of a seat belt (not shown) is provided at a position toward the rear of the center in the longitudinal direction of the left cushion side frame 20. The seat belt is a so-called three-point seat belt, and the anchor point 24 is a point where the lower end of the seat belt is fixed. More specifically, the anchor point 24 is a location for fastening a retainer that holds the lower end of a seat belt (not shown). The retainer is fastened to the anchor point 24 by a fastener such as a bolt. For this reason, the anchor point 24 is a through hole that passes through the left cushion side frame 20 in the left-right direction, as shown in FIG. 6. That is, the anchor point 24, which is a through hole, is formed so as to pass through the left divided body 20a, the right divided body 20b, and a first bracket 41, which will be described later. The bolt that fastens the retainer is passed through the anchor point 24, which is a through hole, and a nut (not shown) is provided at the tip. This nut may be provided at a location corresponding to the anchor point 24 inside the cushion side frame 20.

[0034] The other cushion side frame 21 (the right side in this embodiment) of the left and right cushion side frames 20, 21 is formed to have a U-shaped cross section that is open toward the inside (left side). That is, it is composed of a web 210 and flanges 211, 212 integrally formed above and below the web 210. In this embodiment, the right cushion side frame 21 has a U-shaped cross section, but as shown in FIG. 8, it may have a closed cross section similar to the left cushion side frame 20 (for convenience of explanation, it is denoted by reference numeral 21A in FIG. 8). By forming the left and right cushion side frames 20, 21A into a closed cross section structure, the rigidity of the cushion frame 2 can be increased compared to a case where only one of them has a closed cross section structure. A reinforcing plate 21a having a U-shaped cross section is integrally attached by welding or the like to the rear side of the other cushion side frame 21 along the inner surface of the U-shaped cross section. This ensures a sufficient plate thickness at the rear of the cushion side frame 21, thereby improving the rigidity at the rear of the cushion side frame 21 where a load is likely to be applied. Although not shown, a buckle to which a tongue of a three-point seat belt is attached is provided on the right cushion side frame 21. At the fixing position of the buckle, as shown in Fig. 3, a nut 25 into which a fixing bolt is screwed is provided.

[0035] As shown in FIGS. 1 to 3, the back pipe frame 22 connects the rear end portions of the left and right cushion side frames 20, 21 together. Both ends of the back pipe frame 22 are provided so as to penetrate the left and right cushion side frames 20, 21, respectively, and are joined by welding (welded parts W).

[0036] As shown in Figures 1 to 3 and 7, the back pipe frame 22 is provided with left and right mounting portions (also called lower anchorages) 22a, 22b onto which an ISOFIX-type child seat (not shown) that complies with ISOFIX, an international standard for the method of mounting a child seat, is mounted.

[0037] The mounting portion 22a located on the left side is generally formed in a generally U-shape or generally tortoise shell shape, with the rear surface curved to fit the outer circumferential surface of the back pipe frame 22, and the bottom portion fixed to a movable rail 50b of the lateral slide rail 50 described below by a bolt 510. Also, a generally U-shaped wire 220 is provided on the upper surface portion located above the back pipe frame 22 so as to protrude forward. Also, flanges are formed on the bottom and upper surface portions to improve rigidity. 7, 15, etc., the right end portion at the rear surface and the left and right ends at the upper end of the mounting portion 22a are joined to the back pipe frame 22 by welding, and the left end portion at the rear surface is joined to the right side surface of the left cushion side frame 20 (i.e., the right divided body 20b) by welding (welded portion W). In other words, the mounting portion 22a connects the left cushion side frame 20, the back pipe frame 22, and the movable rail 50b of the lateral slide rail 50. 1 to 3, the attachment portion 22b located on the right side is formed as a bracket consisting of an upper surface portion and left and right flange portions, and a wire 221 is provided integrally with the upper surface portion. This wire 221 is bent into a substantially U-shape and protrudes forward. The protruding direction and protruding length are set to be the same as those of the wire 220 in the attachment portion 22a located on the left side. The wires 220, 221 on the left and right mounting portions 22a, 22b are adapted to be hooked onto left and right connectors provided at the rear of the child seat.

[0038] 1 and 4, the front pipe frame 23 is bent into a generally U-shape, with its left end 23a joined to the front end of the left cushion side frame 20. Also, its right end 23b joined to the front end of the right cushion side frame 21. More specifically, the left end portion 23a of the front pipe frame 23 is welded to the web 200 and the upper and lower flanges 201, 202 of the left division body 20a of the left cushion side frame 20. Also, the right end portion 23b of the front pipe frame 23 is welded to the web 210 and the upper and lower flanges 211, 212 of the right cushion side frame 21. The front pipe frame 23 is bent so as to incline upward from the left and right ends 23a, 23b toward the front.

[0039] [About the seat back frame] Next, as shown in Figures 1, 9 to 14, etc., the seat back frame 3 has left and right back side frames 30, 31 arranged at a distance from each other, an upper pipe frame 32 (a back frame formed in a U-shape) that connects the upper end portions of the left and right back side frames 30, 31, and a lower pipe frame 33 (back frame) that connects the lower end portions of the left and right back side frames 30, 31.

[0040] Of the left and right back side frames 30, 31, one (the left side in this embodiment) of the back side frame 30 is integrally formed as a hollow body with a closed cross-sectional structure (also called a monaka structure) by combining a left side section 30a and a right side section 30b, as shown in Figures 9 to 11.

[0041] The left divided body 30a is formed to have a U-shaped cross section that is open toward the inside (right side), and is made up of a web 300 and flanges 301 and 302 that are integrally formed at the front and rear of the web 300. The tip of the front flange 301 is bent rearward to form a bent portion 301a.

[0042] As shown in FIGS. 1, 9 and 11, the web 300 has a recess 300a and bulges 300b and 300c. The recess 300a is formed so as to bulge inward from the lower end to the vicinity of the upper end of the web 300 and to be recessed when viewed from the outer surface (left side surface). As the recess 300a is formed, bulging portions 300b, 300c are formed on the front and rear edges of the web 300, bulging outward (leftward) from the recess 300a. The front bulge 300b is integrally formed with the front flange 301, and the rear bulge 300c is integrally formed with the rear flange 302.

[0043] The right divisional body 30b is formed to have a U-shaped cross section that is open toward the outside (left side), and is made up of a web 303 and flanges 304 and 305 that are integrally formed at the front and rear of the web 303. As shown in FIGS. 1, 9 and 11, the web 303 has a recess 303a and bulges 303b and 303c. The recess 303a is formed so as to bulge inward from the vicinity of the lower end of the web 303 to the vicinity of the upper end thereof and to be recessed when viewed from the outer surface (right side surface). As the recess 303a is formed, bulging portions 303b, 303c are formed on the front and rear edges of the web 303, bulging outward (to the right) from the recess 303a. The front bulge 303b is integrally formed with the front flange 304, and the rear bulge 303c is integrally formed with the rear flange 305.

[0044] The web 300 in the left divisional body 30a and the web 303 in the right divisional body 30b face each other and are spaced apart from each other. The front flange 301 of the left section 30a and the front flange 304 of the right section 30b overlap with each other so that the front flange 304 of the right section 30b is on the front side. Since the bent portion 301a is bent rearward as described above, it is spaced apart from the front flange 304 of the right section 30b. Note that the bent portion 301a is bent so as to fit along the surface of the front flange 42a of the second bracket 42, which will be described later (see FIG. 11). The rear flange 302 of the left divisional body 30a and the rear flange 305 of the right divisional body 30b overlap with each other such that the rear flange 305 of the right divisional body 30b is located on the rear side.

[0045] The front and rear flanges 301, 302 of the left divisional body 30a and the front and rear flanges 304, 305 of the right divisional body 30b, which overlap each other, are joined by welding at a plurality of points (welds W). When joining the front flange 301 of the left section 30a and the front flange 304 of the right section 30b by welding, the welding material (base material) may flow into the gap between the overlapping flanges 301, 304. In such a case, the flowed-in welding material can be received in the gap between the flanges 304 and the bent portion 301a, which are spaced apart from each other.

[0046] The lower end of the left back side frame 30 opens downward so that the upper part of a second bracket 42, which will be described later, can be inserted therein. The left back side frame 30 is formed so as to gradually become thicker downward in a side view. Therefore, the opening at the lower end is formed wider than the internal hollow portion, making it easier to insert the upper portion of the second bracket 42.

[0047] The other of the left and right back side frames 30, 31 (the right side in this embodiment) is formed to have a U-shaped cross section that is open toward the inside (left side) and is composed of a web 310 and flanges 311, 312 that are integrally formed at the front and rear of the web 310. Also, the right-side back side frame 31 is formed shorter than the left-side back side frame 30. Furthermore, the lower end of the right-side back side frame 31 and the lower end of the left-side back side frame 30 are disposed at the same height. That is, the upper end of the left-side back side frame 30 protrudes upward more than the upper end of the right-side back side frame 31. A guide bracket 34 used to guide a seat belt (not shown) is provided at the upper end of the left-side back side frame 30. That is, the guide bracket 34 is located on the upper end side of the three-point seat belt. The upper end of the right-side back side frame 31 is narrower than the central and lower ends, so that an intermediate pipe 32b of the upper pipe frame 32, which will be described later, can be sandwiched therebetween. The guide bracket 34 is used in combination with a front portion 34a that covers the front surface of the upper end portion of the left back side frame 30.

[0048] As shown in FIGS. 1 and 2, the upper pipe frame 32 connects the upper ends of the left and right back side frames 30, 31 together. The upper pipe frame 32 is bent into a generally U-shape and includes an upper pipe 32a extending in the left-right direction, a middle pipe 32b extending in the up-down direction, and a lower pipe 32c extending in the left-right direction. Note that there are bent portions between the upper pipe 32a and the middle pipe 32b, and between the middle pipe 32b and the lower pipe 32c. Although not shown, square pipes 32d, 32d to which pillar holders for holding headrest pillars are attached are joined to the upper pipe 32a. The left end portions of the upper pipe 32a and the lower pipe 32c are joined to the left back side frame 30 by welding (weld portion W). The left end portions of the upper pipe 32a and the lower pipe 32c are provided so as to penetrate the web 300 of the left divided body 30a constituting the left back side frame 31. The left end portion of the upper pipe 32a penetrating the web 300 is covered by a piece of the guide bracket 34. The left end portion of the lower pipe 32c penetrating the web 300 does not protrude outward (leftward) beyond the bulges 300b, 300c formed in front and behind the web 300. The intermediate pipe 32b is located at the upper end of the right-side back side frame 31, inside the web 310 and the front and rear flanges 311, 312, in a sandwiched state, and is further joined to the web 310 and the front and rear flanges 311, 312 by welding (weld part W).

[0049] The lower pipe frame 33 is a single pipe frame extending laterally and connects the lower ends (slightly above the lower ends) of the left and right back side frames 30, 31. Both longitudinal ends of the lower pipe frame 33 are provided so as to penetrate the left and right back side frames 30, 31, respectively, and are joined by welding (welded parts W). The left end of the lower pipe frame 33 penetrates the web 300 of the left separate body 30a constituting the left back side frame 30, but does not protrude outward (to the left) beyond the bulges 300b, 300c formed at the front and rear of the web 300. In other words, the left end of the lower pipe frame 33 penetrates the recess 300a in the web 300 of the left separate body 30a.

[0050] [About the reclining mechanism] Next, as shown in Figures 1 to 14, the reclining mechanism 4 has a substantially disc-shaped round recliner 40 with a rotation prevention function, a first bracket 41 and a second bracket 42 for the left side of the seat connected via the round recliner 40, and a third bracket 43 for the right side of the seat.

[0051] The round recliner 40 is provided on each of the left and right sides of the seat frame 1, and on the left side of the seat, the round recliner 40 connects the second bracket 42 to the first bracket 41 in a rotatable manner. On the right side of the seat, the right back side frame 31 is connected to the third bracket 43 in a rotatable manner. The reclining mechanism 4 is provided with a rotation shaft 4a that passes through the center of the round recliner 40 and serves as the rotation center of the seat back frame 3. The rotation shaft 4a is provided so as to penetrate the first bracket 41 and the second bracket 42.

[0052] The first bracket 41 is formed in a plate shape with a main plate portion, and as shown in Figures 3, 5, etc., the round recliner 40 is provided on the upper portion, and the lower portion is fixed to the left cushion side frame 20. The round recliner 40 is joined by welding to the inner surface (right side surface) of the upper portion of the first bracket 41 (welded portion W). In order to improve the rigidity of the first bracket 41, flanges 41a and 41b are integrally formed on the front and rear edges of the first bracket 41, respectively. Furthermore, a vertical intermediate portion 41c of the main body plate portion of the first bracket 41 is formed in a stepped shape so that an upper portion of the first bracket 41 is positioned outward relative to a lower portion.

[0053] The lower part of the first bracket 41 is provided so as to be inserted from a portion that opens upward on the rear end side of the cushion side frame 20 having a closed cross-sectional structure. The lower part of this first bracket 41 is fixed to the outer surface of the cushion side frame 20 at two positions, front and rear, by bolts 410, 411. The bolts 410 and 411 pass through the cushion side frame 20 from left to right, and nuts 412 and 413 are fastened to the inner surface of the cushion side frame 20 as shown in FIG. The bolts 410, 411 are located at one position in front of the back pipe frame 22 and one position behind the back pipe frame 22.

[0054] As shown in Fig. 5, a protruding piece 41d that protrudes diagonally downward and forward is integrally formed on the lower part of the first bracket 41 below the fixing points by the bolts 410, 411. The protruding piece 41d is a portion where the anchor point 24, which is the above-mentioned through hole, is formed. In other words, a through hole that becomes the anchor point 24 is formed in the protruding piece 41d.

[0055] The second bracket 42 is formed in a plate shape with a main plate portion, and as shown in Figures 9 to 14, the round recliner 40 is provided at the lower portion, and the upper portion is fixed to the left back side frame 30. The round recliner 40 is joined to the outer surface (left surface) of the lower portion of the second bracket 42 by welding. In order to improve the rigidity of the second bracket 42, flanges 42a, 42b are integrally formed on the front and rear edges of the second bracket 42, respectively. Further, a bent plate portion 42c bent into a crank shape is integrally formed at the upper end of the main plate portion of the second bracket 42. The bent plate portion 42c comprises a first piece 420 which is integrally formed with the upper edge portion of the main plate portion and protrudes upward, a second piece 421 which protrudes from the upper end portion of the first piece 420 in a direction away from the main plate portion (to the left in this embodiment), and a third piece 422 which protrudes upward from the tip of the second piece 421 in the protruding direction.

[0056] The upper portion of the second bracket 42 including the bent plate portion 42c is provided so as to be inserted from a portion of the lower end portion of the back side frame 30 having a closed cross-sectional structure, the portion being open downward. The main body plate portion of the second bracket 42 contacts and is joined by welding to the web 303 of the right section 30b of the back side frame 30. The third piece 422 of the bent plate portion 42c contacts and is joined by welding to the web 300 of the left section 30a of the back side frame 30 (welded portion W). Welding holes 300d, 303d penetrating the webs 300, 303 are formed in the webs 300, 303 of the left half body 30a and the right half body 30b at the locations where the second bracket 42 abuts, and the main body plate portion of the second bracket 42 and the third piece 422 are welded and fixed using the holes 300d, 303d. In other words, the edges of the holes 300d, 303d are welded to the main body plate portion of the second bracket 42 and the third piece 422. This allows the main body plate portion of the second bracket 42 and the third piece 422 to be welded from the outer surface side of the back side frame 30, which has a closed cross-sectional structure. In this embodiment, the third piece 422 is in contact with the web 300 of the left section 30a and joined by welding, but it may be in a state where it is simply in contact with the web 300 without being joined. Furthermore, the main body plate portion of the second bracket 42 is welded to the right divisional body 30b not only at the position of the hole 303d, but also at a plurality of positions below the hole 303d.

[0057] More specifically, the second bracket 42 has its main body plate portion fixed in contact with the web 303 of the right-side section 30b, and the third piece 422 of the bent plate portion 42c above the main body plate portion fixed in contact with the web 300 of the left-side section 30a. In other words, the second bracket 42 is fixed to the back side frame 30 at two points spaced apart in a diagonal direction inside the left back side frame 30 into which it is inserted. More specifically, one of the fixing points (the point where the third piece 422 of the bent plate portion 42c is fixed: the position of the hole 300d) is located on the upper side and on the outer side, and the other fixing point (the point where the main body plate portion is fixed: the position of the hole 303d and other welding points) is located on the lower side and on the inner side. Since the second bracket 42 is fixed inside the back side frame 30 at two points spaced apart diagonally above and below, it exhibits a reinforcing effect against the load applied to the three-point seat belt that is hung across the body.

[0058] The third bracket 43 is formed in a plate shape with a main plate portion, and as shown in Figs. 1 and 3, the round recliner 40 is provided at the upper portion, and the lower portion is fixed to the outer surface of the right cushion side frame 21. The round recliner 40 is joined by welding to the inner surface (left side surface) at the upper portion of the third bracket 43. The round recliner 40 is also joined by welding to the outer surface (right side surface) at the lower end portion of the right back side frame 31. Flanges 43a, 43b are integrally formed contiguous with the front, lower and rear edges of the third bracket 43 to improve the rigidity of the third bracket 43 (see Figure 19, etc.). The lower end of the third bracket 43 is fixed to the right-side cushion side frame 21 by means of two bolts 430, 431 at the front and rear. The bolts 430, 431 pass through the third bracket 43 and the cushion side frame 21 in the left-right direction, and nuts 432, 433 are fastened to the inner surface of the cushion side frame 21 as shown in FIG. The bolts 430, 431 are located at one position in front of the back pipe frame 22 and one position behind the back pipe frame 22. That is, the positional relationship is exactly opposite to that of the above-mentioned bolts 410, 411 provided on the left side.

[0059] [About the seat support part] Next, as shown in Figures 1 to 4, 7, 15 and 16, the seat support portion 5 has lateral slide rails 50, 51 respectively provided on the front and rear sides of the cushion frame 2, foot brackets 52, 53 provided on the left and right ends of the front lateral slide rail 50, foot brackets 54, 55 provided on the left and right ends of the rear lateral slide rail 51, and a connecting member 56 connecting the front and rear foot brackets 52, 54 provided on the left side. The lower end of each of the foot brackets 52 to 55 is attached to the movable rail of the pair of left and right front and rear slide rails described above. That is, the seat support part 5 in this embodiment is capable of supporting the vehicle seat on the floor via the front and rear slide rails.

[0060] The lateral slide rails 50, 51 are for sliding the seat frame 1 in the left-right direction, and are formed long in the left-right direction. As shown in Figures 4 and 16, the lateral slide rails 50, 51 include fixed rails 50a, 51a and movable rails 50b, 51b that are slidable in the longitudinal direction relative to the fixed rails 50a, 51a, thereby enabling the position of the seat frame 1 to be adjusted in the left-right direction.

[0061] The fixed rail 50a of the lateral slide rail 50 provided on the front side is provided to span between the upper ends of foot brackets 52, 53 located on the front side. The movable rail 50b of the lateral slide rail 50 provided on the front side is provided to span across the lower surfaces of the left and right cushion side frames 20, 21 in the vicinity of the left and right side ends 23a, 23b of the front pipe frame 23 of the cushion frame 2. More specifically, as shown in Fig. 4, a connecting member 206 that protrudes inward along the extension direction of the lateral slide rail 50 is integrally provided by welding or the like on the inner surface of the front end of the left cushion side frame 20 (i.e., the right divided body 20b), and the movable rail 50b is fixed to this connecting member 206. In other words, the left end of the movable rail 50b is provided on the lower surface of the left cushion side frame 20 via the connecting member 206. The right end of the movable rail 50b is fixed to a lower flange 212 at the front end of the right cushion side frame 21. The movable rail 50b is fixed to the horizontal slide rail 50 by bolts 500 and 501 and nuts 502 and 503.

[0062] Although not shown, the bolt 500 that connects the movable rail 50b and the connection member 206 is located forward of the terminal portion of the left end portion 23a of the front pipe frame 23 in the cushion frame 2. In addition, the bolt 501 connecting the movable rail 50b and the lower flange 212 at the front end of the right cushion side frame 21 is located forward of the terminal portion of the right end 23b of the front pipe frame 23 in the cushion frame 2, as shown in Figure 4. In other words, the left and right side ends 23a, 23b of the front pipe frame 23 extend rearward from the points at which the movable rail 50b is fixed to the cushion side frames 20, 21.

[0063] The fixed rail 51a of the horizontal slide rail 51 provided on the rear side is provided to span between the upper ends of the foot brackets 54 and 55 located on the rear side. The movable rail 51b of the horizontal slide rail 51 provided on the rear side is provided to span across the lower surfaces of the left and right cushion side frames 20, 21 in the vicinity of the left and right end portions of the back pipe frame 22 of the cushion frame 2. More specifically, the above-mentioned attachment portion 22a is integrally provided on the inner surface of the rear end portion of the left cushion side frame 20 (i.e., the right division body 20b), and the movable rail 51b is fixed to the bottom of this attachment portion 22a by a bolt 510 and a nut 512. That is, since the attachment portion 22a is welded to the left cushion side frame 20 and the back pipe frame 22 as described above, the left end portion of the movable rail 51b is also connected to the left cushion side frame 20 and the back pipe frame 22 via the attachment portion 22a. Further, the right end portion of the movable rail 51b is fixed to the lower flange 212 at the rear end portion of the right cushion side frame 21. The right end portion of the movable rail 51b is fixed by a bolt 511 and a nut 513.

[0064] Each of the foot brackets 52 to 55 is formed in a substantially box-like shape by plate parts facing each other in the front and rear, plate parts facing each other in the left and right, and a plate part constituting the upper surface. The plate parts are joined together by welding. The shape of each of the foot brackets 52 to 55 may be changed as appropriate depending on the front and rear slide rails (not shown) and the floor of the vehicle body. The fixed rails 50a, 51a of the horizontal slide rails 50, 51 are joined to the plate portions constituting the upper surfaces of the foot brackets 52 to 55 by bolting or welding.

[0065] The connecting member 56 is a pipe frame that connects the front and rear foot brackets 52, 54 provided on the left side. The connecting member 56 is provided so as to penetrate the front and rear plate portions of the foot bracket 52 located on the front side and the front and rear plate portions of the foot bracket 54 located on the rear side. In other words, the front end portion of the connecting member 56 protrudes forward from the front plate portion of the foot bracket 52 located on the front side, and the rear end portion protrudes rearward from the rear plate portion of the foot bracket 54 located on the rear side. The connecting member 56 is joined to the respective plate portions of the front and rear foot brackets 52, 54 by welding (welded portion W). This not only improves the integrity of the left side portion of the seat support part 5, but also enhances the reinforcing effect over a wide range including the left side portion of the cushion frame 2 fixed to the seat support part 5.

[0066] [About anti-peeling structure] Next, the peeling prevention structure 6 prevents the cushion frame 2 from peeling off from the seat support portion 5, and is provided on the rear left side of the seat frame 1 as shown in FIGS. Such a peeling prevention structure 6 includes the back pipe frame 22 of the cushion frame 2, the left front foot bracket 52 and the left rear foot bracket 54 of the seat support part 5, a connecting member 56 connecting the foot brackets 52, 54 arranged at the front and rear on the left side of the seat, an upper peeling prevention part 60 fixed to the rear surface of the back pipe frame 22, and a lower peeling prevention part 61 fixed to the rear surface of the foot bracket 54 and engaged with the upper peeling prevention part 60. In this embodiment, a single connecting member 56 connects the front foot bracket 52 and the rear foot bracket 54, but as shown in FIG. 18, the front and rear foot brackets 52, 54 may be connected by a plurality of connecting members 56. This makes the fixed state of the lower peeling prevention part 61 more firmly, and the peeling prevention effect of the peeling prevention structure 6 on the lateral slide rails 50, 51 can be enhanced. When multiple connecting members 56 are used, the sizes of the front and rear foot brackets 52, 54 are appropriately changed to a size sufficient for attaching multiple connecting members 56 (for ease of explanation, the wide rear foot bracket shown in Figure 18 is given the symbol 54A, and the front foot bracket 52 not shown in Figure 18 is set to approximately the same size as the rear foot bracket 54A). The back pipe frame 22, the foot bracket 52, the foot bracket 54, and the connecting member 56 are configured as described above.

[0067] 15 and 17, the upper peel-off prevention part 60 is disposed behind the left-side mounting part 22a on which a child seat (not shown) is attached. Note that not only the upper peel-off prevention part 60 but also the peel-off prevention structure 6 itself is disposed behind the left-side mounting part 22a, and when the peel-off prevention structure 6 is viewed straight from behind, the peel-off prevention structure 6 and the left-side mounting part 22a are disposed at substantially the same position in the left-right direction of the seat frame 1. Such an upper peel-off prevention portion 60 comprises a fixing portion 600 located at the upper end of the upper peel-off prevention portion 60 and fixed to the rear surface of the back pipe frame 22, a main body portion 601 integrally formed below the fixing portion 600, and an upper engagement portion 602 integrally formed at the lower end of the main body portion 601.

[0068] The fixing portion 600 has a central recess 600a formed so that the central portion in the left-right direction is recessed toward the back pipe frame 22 side, and left and right flanges 600b, 600c formed on the left and right side edges so as to protrude toward the back pipe frame 22 side. The fixing portion 600 is joined to the back pipe frame 22 by welding at the position where the central recess 600a is formed and at the positions where the left and right flanges 600b, 600c are formed (welded portion W). The welding positions of the left and right flanges 600b, 600c to the back pipe frame 22 are in substantially the same positional relationship in the left and right direction of the seat frame 1 as the welding positions of the left and right ends at the upper end of the rear surface of the attached portion 22a to the back pipe frame 22.

[0069] The main body 601 is formed to be wider in the left-right direction than the fixing part 600. In addition, a plurality of beads 601a are formed in a line on the rear surface of the main body 601 to improve the rigidity of the main body 601. These plurality of beads 601a are formed to be longer in the up-down direction than in the left-right direction. Left and right flanges (flange-shaped) 601b, 601c formed so as to protrude toward the back pipe frame 22 are integrally provided on the left and right side edges of the main body 601 on the fixing part 600 side. The left and right flanges 601b, 601c of the main body 601 and the left and right flanges 600b, 600c of the fixing part 600 are integrally formed.

[0070] 16 and 17, the upper engagement portion 602 is curved from the lower end of the main body 601 toward the rear lateral slide rail 51 so as to have a hook-shaped cross section. In other words, the upper engagement portion 602 is formed in a substantially J-shape in cross section.

[0071] As shown in Figures 15 to 17, the lower peeling prevention portion 61 comprises a fixing portion 610 fixed to the rear surface of the foot bracket 54 by a bolt 611, and a lower engagement portion 612 integrally formed on the upper end portion of the fixing portion 610.

[0072] The fixing portion 610 is fixed to the rear plate portion (described above) constituting the foot bracket 54 disposed at the rear left side of the seat by a bolt 611. The lower edge portion of the fixing portion 610 is curved so as to avoid the connecting member 56 protruding rearward, and the fixing positions of the bolt 611 are on both the left and right sides of the connecting member 56.

[0073] 16, the lower engaging portion 612 is curved from the upper end of the fixing portion 610 toward the upper engaging portion 602 of the upper peeling prevention portion 60 so as to have a hook-shaped cross section. In other words, the lower engaging portion 612 is formed in a substantially inverted J-shape in cross section.

[0074] 16, the upper engagement portion 602 of the upper peel-off prevention portion 60 and the lower engagement portion 612 of the lower peel-off prevention portion 61 are positioned to engage with each other, and the foot bracket 54 on which the lower peel-off prevention portion 61 is provided is connected to the front foot bracket 52 by the connecting member 56. Therefore, when a large load is applied due to the vehicle colliding with something, for example, this has the effect of preventing the cushion frame 2 from peeling off from the seat support portion 5.

[0075] Furthermore, since the upper engagement portion 602 and the lower engagement portion 612 have no flanges or walls at their left and right ends, even when the upper engagement portion 602 and the lower engagement portion 612 are engaged with each other, they do not impede the sliding movement of the seat frame 1 by the lateral slide rails 50, 51. Furthermore, the length in the left-right direction over which the upper engaging portion 602 and the lower engaging portion 612 engage with each other is set to be greater than the length of sliding movement caused by the lateral slide rails 50 and 51 .

[0076] [Effects of this embodiment] According to the present embodiment as described above, the plate-shaped first bracket 41 is inserted into the opening of the cushion side frame 20 having a closed cross-sectional structure, and the seat belt anchor point 24 is disposed at the position where the cushion side frame 20 having a closed cross-sectional structure and the first bracket 41 overlap. Therefore, the seat belt anchor point 24 can be set on both the cushion side frame 20 having a closed cross-sectional structure and the first bracket 41, and the rigidity required to provide the seat belt anchor point 24 can be ensured. Furthermore, since the plate-shaped first bracket 41 is inserted and fixed through an opening in the cushion side frame 20, which has a closed cross-sectional structure, manufacturing is easier and weight can be reduced compared to, for example, a case in which components with closed cross-sectional structures are stacked together in an inserted state.

[0077] In addition, the cushion side frame 20 and the first bracket 41, which have a closed cross-sectional structure, are connected by bolts 410, 411 at two locations, one before and one after the position where the cushion side frame 20 and the first bracket 41 overlap, so that the connection strength between the cushion side frame 20 and the first bracket 41, which have a closed cross-sectional structure, can be improved, and the rigidity of the cushion frame 2 itself can also be improved.

[0078] In addition, the front and rear flanges 41a, 41b of the first bracket 41 contact the inner surfaces located at the front and rear of the inner surface of the cushion side frame 20, which has a closed cross-sectional structure, so that the load applied to the cushion frame 2 can be distributed between the front and rear flanges 41a, 41b that contact each other and the front and rear inner surfaces.

[0079] In addition, a recess 200a that is recessed inward is formed on the side of the cushion side frame 20, which has a closed cross-sectional structure, so that the cross-section of the cushion side frame 20, which has a closed cross-sectional structure, can be enlarged, thereby improving rigidity.

[0080] In addition, since the recess 200a is formed in the vicinity of the anchor point 24, the rigidity of the cushion side frame 20 in the vicinity of the anchor point 24 can be improved.

[0081] Furthermore, of both longitudinal ends of the back pipe frame 22, at least the end facing the cushion side frame 20, which has a closed cross-sectional structure, penetrates the cushion side frame 20, which has a closed cross-sectional structure, from left to right, thereby improving the mounting strength of the back pipe frame 22 to at least the cushion side frame 20, which has a closed cross-sectional structure, and also improving the rigidity of the cushion frame 2 itself.

[0082] In addition, since the mounting portion 22a on which the child seat is attached is welded to both the back pipe frame 22 and the cushion side frame 20 having a closed cross-sectional structure, the mounting strength of the mounting portion 22a to the back pipe frame 22 can be improved, and the rigidity of the portion where the back pipe frame 22 and the cushion side frame 20 having a closed cross-sectional structure are connected can be improved.

[0083] In addition, the left and right side ends 23a, 23b of the front pipe frame 23 are welded to the webs 200, 210 and the upper and lower flanges 201 / 211, 202 / 212 respectively provided at the front ends of the left and right cushion side frames 20, 21, so that the left and right side ends 23a, 23b of the front pipe frame 23 can be held in a sandwiched manner.

[0084] Also, the left and right side end portions 23a, 23b of the front pipe frame 23 extend rearward from the fixing points (the points of the bolts 500, 501) of the front lateral slide rail 50 to the cushion frame 2, so that the fixing points of the front lateral slide rail 50 to the cushion frame 2 are points with increased rigidity, and the left and right side end portions 23a, 23b of the front pipe frame 23 are in a state of being inserted deeper than the points with increased rigidity. This makes it easier to distribute the load applied to the front pipe frame 23, and makes it easier for the front pipe frame 23 to support the load.

[0085] In addition, the overlapping portions between the left and right side end portions 23a, 23b of the front pipe frame 23 and the front end portions of the left and right cushion side frames 20, 21 extend in front of and behind the fixing points (bolts 500, 501) of the front lateral slide rail 50, so that the left and right side end portions 23a, 23b of the front pipe frame 23 can be held over a wide range by the front end portions of the left and right cushion side frames 20, 21.

[0086] Furthermore, at least one of the left and right back side frames 30, 31 has a closed cross-sectional structure, so that the necessary rigidity can be ensured in at least one of the left and right back side frames 30, 31. Furthermore, the plate-shaped second bracket 42, which has a main plate portion and a bent plate portion 42c bent in a direction away from the main plate portion and protrudes upward from the cushion frame 2 side, is inserted through an opening in the back side frame 30, which has a closed cross-sectional structure, and joined to the back side frame 30. This makes it easier to manufacture and reduces the weight, compared to, for example, a case in which components with closed cross-sectional structures are overlapped while being inserted into each other. Moreover, since the bent plate portion 42c is in contact with the inner surface of the back side frame 30 having a closed cross-sectional structure, the load acting on the seat back frame 3 can be dispersed at the position where the bent plate portion 42c is in contact.

[0087] In addition, the main body plate portion of the second bracket 42 contacts the inner side surface of the back side frame 30 having a closed cross-sectional structure, and the bent plate portion 42c formed by bending in a direction away from the main body plate portion is integrally formed at the upper end portion of the main body plate portion, so that the second bracket 42 contacts, shifted in the up-down direction, each of the inner side surface located on the inner side of the seat and the inner side surface located on the outer side of the seat among the inner sides of the back side frame 30 having a closed cross-sectional structure. This makes it possible to distribute the load applied to the seatback frame 3 more effectively than when the second bracket 42 contacts only one of the inner side surface located on the inner side of the seat and the inner side surface located on the outer side of the seat among the inner sides of the back side frame 30 having a closed cross-sectional structure. Furthermore, for example, when a guide bracket 34 used to guide a seat belt is attached to the upper end of the back side frame 30 having a closed cross-sectional structure, it is expected that a load will be applied diagonally when the seat belt is used, and such a load applied diagonally is also easily distributed.

[0088] In addition, holes 300d, 303d are formed in the back side frame 30, which has a closed cross-sectional structure, at the points where the second bracket 42 contacts, and the back side frame 30, which has a closed cross-sectional structure, and the second bracket 42 are welded together using the holes 300d, 303d, making it easy to weld the second bracket 42 from the outer surface of the back side frame 30, which has a closed cross-sectional structure.

[0089] In addition, the second bracket 42 has flanges 42a, 42b integrally formed on the front and rear edges of the main body plate portion, and the front and rear flanges 42a, 42b are in contact with the inner surfaces located on the front and rear sides of the inner surface of the back side frame 30, which has a closed cross-sectional structure, so that the load applied to the seat back frame 3 can be distributed between the front and rear flanges 42a, 42b that are in contact with each other and the front and rear inner surfaces.

[0090] In addition, since the front and rear flanges 42a, 42b are welded to the back side frame 30 having a closed cross-sectional structure, the attachment state of the back side frame 30 to the second bracket 42 can be made strong, making it easier to support the back side frame 30.

[0091] In addition, at least on the outer surface of the back side frame 30 having a closed cross-sectional structure toward the outside of the seat, a recess 300a recessed toward the inside of the seat is formed, so that the cross section of the back side frame 30 having a closed cross-sectional structure can be enlarged, and rigidity can be improved.

[0092] In addition, since both longitudinal ends of the lower pipe frame 33 spanning between the left and right back side frames 30, 31 penetrate each of the left and right back side frames 30, 31 in the left and right directions, the mounting strength of the lower pipe frame 33 to the left and right back side frames 30, 31 can be improved, and the rigidity of the seat back frame 3 itself can also be improved.

[0093] Furthermore, of both longitudinal ends of the lower pipe frame 33, at least the end on the back side frame 30 side, which has a closed cross-sectional structure, penetrates the recess 300a and does not protrude outward beyond the recess 300a. Therefore, when a cushion pad is provided on the seat back frame 3 and the back side frame 30, which has a closed cross-sectional structure, is covered by the cushion pad, interference between the cushion pad and the end of the lower pipe frame 33 is unlikely to occur.

[0094] In addition, the seat back frame 3 has an upper pipe frame 32 formed in a U-shape with both ends extending sideways, which is bridged between the left and right back side frames 30, 31. If, for example, three straight frames are used, a boundary (edge) will be created between each frame. However, the U-shaped upper pipe frame 32 can eliminate such a boundary. This can prevent an object from hitting the boundary between each frame when it collides against the seat back, thereby improving safety. In addition, the U-shaped upper pipe frame 32 is easier to distribute the load than, for example, three straight frames. Furthermore, the number of parts can be reduced by using the upper pipe frame 32 formed in a U-shape rather than using three straight frames.

[0095] In addition, since both ends of the U-shaped upper pipe frame 32 penetrate left and right through the back side frame 30 having a closed cross-sectional structure, the mounting strength of the U-shaped upper pipe frame 32 to the back side frame 30 having a closed cross-sectional structure can be improved, and the rigidity of the seat back frame 3 itself can also be improved.

[0096] In addition, since the foot bracket 54 to which the lower peeling prevention part 61 is fixed is connected to the front foot bracket 52 by the connecting member 56, the fixed state of the lower peeling prevention part 61 is stronger than when, for example, the front and rear foot brackets 52, 54 are not connected by the connecting member 56. Furthermore, since the upper peeling prevention part 60 fixed to the cushion frame 2 side and the lower peeling prevention part 61 fixed to the rear foot bracket 54 of the front and rear foot brackets 52, 54 connected by the connecting member 56 are engaged with each other in a state in which the cushion frame 2 can slide and move by the front and rear horizontal slide rails 50, 51, peeling between the fixed rails 50a, 51a and the movable rails 50b, 51b of the horizontal slide rails 50, 51 is more easily prevented.

[0097] In addition, since the lower peel-off prevention part 61 is fixed at a position on the rear foot bracket 54 so as to sandwich the connecting member 56 (at the position of bolt 611), the fixing point of the lower peel-off prevention part 61 and the connecting member 56 can be brought close to each other, making it easier to strengthen the fixed state of the lower peel-off prevention part 61.

[0098] In addition, since the upper peel-off prevention part 60 is fixed to the back pipe frame 22 provided at the rear end of the cushion frame 2, it is easier to strengthen the fixing strength of the upper peel-off prevention part 60 compared to, for example, a case in which the upper peel-off prevention part 60 is fixed to the lateral slide rail 51.

[0099] In addition, the fixing portion 600 in the upper peel-off prevention portion 60 has a central recess 600a formed in the left-right center of the fixing portion 600, which is recessed toward the back pipe frame 22 side. Therefore, the cross-section of the fixing portion 600 can be increased by the central recess 600a, thereby improving rigidity.

[0100] In addition, the upper peeling prevention portion 60 is welded to the back pipe frame 22 at the central recess 600a of the fixing portion 600 and at both left and right ends (flanges 600b, 600c) of the fixing portion 600, so that it is welded at multiple positions, improving the fixing strength to the back pipe frame 22.

[0101] Furthermore, the upper peel-off prevention part 60 has flange shapes 601b, 601c below the positions of both left and right ends of the fixing part 600 welded to the back pipe frame 22, thereby improving the rigidity at the portion below the fixing part 600. This makes it difficult for the upper peel-off prevention part 60 to deform, and therefore makes it difficult for the upper peel-off prevention part 60 and the lower peel-off prevention part 61 to come out of engagement with each other. Furthermore, for example, when the seat belt is pulled and the upper peel-off prevention portion 60 attempts to deform diagonally forward, the flange shapes 601b, 601c can be brought into contact with the lower peel-off prevention portion 61 and its surroundings, thereby suppressing the amount of displacement.

[0102] In addition, since the upper peel-off prevention portion 60 is disposed behind the mounting portion 22a on which the child seat is mounted and at substantially equal positions in the left-right direction, it is possible to improve the rigidity of the back pipe frame 22 in the vicinity of where the upper peel-off prevention portion 60 and the mounting portion 22a are provided, thereby improving the mounting state of the child seat mounted on the mounting portion 22a.

[0103] Furthermore, since the welding points of the attached portion 22a to the back pipe frame 22 and the welding points at both left and right ends (flanges 600b, 600c) of the fixing portion 600 of the upper peel-off prevention portion 60 are positioned at approximately the same positions in the left and right direction, the rigidity of the area where the upper peel-off prevention portion 60 and the attached portion 22a are welded on the back pipe frame 22 can be improved, and the fixing strength of the upper peel-off prevention portion 60 can be improved.

[0104] In addition, the portion of the upper peel-off prevention portion 60 that engages with the lower peel-off prevention portion 61 is formed longer and wider in the left-right direction than the fixed portion 600, so that even when the cushion frame 2 is slid left and right by the lateral sliding rails 50, 51, the engagement between the upper peel-off prevention portion 60 and the lower peel-off prevention portion 61 is less likely to come loose.

[0105] Furthermore, the upper peeling prevention part 60 has the bead 601a formed extending in the up-down direction on the surface of the upper peeling prevention part 60, which can improve the rigidity of the upper peeling prevention part 60. This makes the upper peeling prevention part 60 less likely to deform, and therefore makes it less likely for the upper peeling prevention part 60 and the lower peeling prevention part 61 to come out of engagement with each other.

[0106] <Second embodiment> Next, a second embodiment of the present invention will be described with reference to the drawings. For convenience of explanation, only components different from the first embodiment will be described.

[0107] The seat frame 1 shown in Figs. 19 to 21 is provided with armrests 7 for supporting the arms of a person seated in the vehicle seat. The armrest 7 is attached to the side surface of the seat frame 1 so as to be freely rotatable in the front-rear direction, and although not shown, is provided with a cushion pad and is covered with a skin. In this embodiment, the armrest 7 is configured to be able to maintain a horizontal state (including an approximately horizontal state, a state close to horizontal, etc.) without any change in angle even when the seat back frame 3 is reclined in a usage state in which the armrest 7 supports a person's arms as shown in Figures 19 and 20. On the other hand, in a stored state in which the armrest 7 does not support a person's arms as shown in Figure 21, the armrest 7 is configured to maintain the stored state. In this embodiment, the armrest 7 is provided on both the left and right sides of the vehicle seat, but the following description will be given of the case where the armrest 7 is provided on the right side of the vehicle seat. In this embodiment, the armrest 7 is provided on both the left and right sides of the vehicle seat, but it may be provided on only one side.

[0108] As shown in Figures 22 and 23, such an armrest 7 has a mounting bracket 70, a main frame 71, a link mechanism 72, a biasing member 73, and an angle control means 74, and the link mechanism 72 is configured to include the reclining mechanism 4 described above. In this embodiment, the biasing member 73 is a tension spring, and is configured to apply a biasing force in a direction that draws together the portion to which one end of the tension spring is hooked and the portion to which the other end is hooked.

[0109] The mounting bracket 70 is attached to the outer surface (right surface) of the right back side frame 31 of the seat back frame 3. A main frame 71 is attached to the mounting bracket 70 via a link mechanism 72, a biasing member 73, and an angle regulating means 74. The mounting bracket 70 is formed in a hollow box shape with a box portion 70a attached to the back side frame 31 and a lid portion 70b that closes the opening of the box portion 70a, thereby increasing its rigidity. A through hole 700 that passes through the outer surface of the mounting bracket 70 from left to right is formed in the center of the lid portion 70b, and the tip of a pivot pin 727 described later is inserted and fixed in place.

[0110] The main frame 71 comprises a main body plate portion 710 arranged vertically to face the back side frame 31, a flange 711 formed integrally with and contiguous to the peripheral edge of the main body plate portion 710, and a first hook portion 712 formed integrally with the flange 711 near the upper rear end portion of the main frame 71.

[0111] The main body plate portion 710 is formed so that the vertical dimension gradually decreases from the base end portion attached to the mounting bracket 70 toward the tip end portion. In addition, a through hole 710a that constitutes the rotation center (referred to as joint C) of the armrest 7 is formed in the center of the base end, and a slot hole 710b into which a stopper pin 741 described later is inserted is curved in a semicircular shape above the through hole 710a at the base end. The flange 711 is formed so as to protrude outward (to the right in this embodiment) from the peripheral edge of the main body plate portion 710. The first hook portion 712 is a portion to which one end of a tension spring serving as the biasing member 73 is hooked, and is formed so as to protrude further outward from the tip of the flange 711. Note that the first hook portion 712 may be formed with a hole through which one end of the tension spring serving as the biasing member 73 passes.

[0112] As shown in Figs. 19 and 20, the link mechanism 72 is a parallel link mechanism in which components of the link mechanism 72 maintain a parallel positional relationship when the seat back frame 3 is reclined. As shown in Figures 18 to 23, such a link mechanism 72 includes a first link 720, a second link 721, a fixed bracket 722, a bearing member 723, a first rotating shaft member 724, a second rotating shaft member 725, a washer member 726, a pivot pin 727, a rotating shaft 4a (referred to as joint D) in the reclining mechanism 4, and a third bracket 43 (second bracket 42 in the case of the left side) in the reclining mechanism 4.

[0113] The first link 720 is a plate-shaped link that constitutes an upper link in the link mechanism 72, and is formed long in the front-rear direction. In addition, this first link 720 has a first through hole 720a at its front end which constitutes the rotation center (joint C) of the armrest 7, and a second through hole 720b at its center into which a stopper pin 741 is inserted, and a third through hole 720c which serves as a connection part with the second link 721 (joint A).

[0114] The second link 721 is a plate-shaped link that constitutes a rear link in the link mechanism 72, and is formed long in the vertical direction. In addition, this second link 721 has a first through hole 721a at its upper end, which serves as the connection part with the first link 721, and a second through hole 721b at its lower end, which serves as the connection part with the fixed bracket 722 (referred to as joint B).

[0115] The fixed bracket 722 is fixed to a flange 43b at the rear edge portion at the upper end portion of the third bracket 43. A through hole (not shown) that serves as a connection portion (joint B) with the second link 721 is formed in the fixed bracket 722. In this embodiment, the fixed bracket 722 is fixed to the third bracket 43 and is in an integrated state, but this is not limited thereto, and the fixed bracket 722 and the third bracket 43 may be formed as an integral unit. By forming the fixed bracket 722 and the third bracket 43 as an integral unit, the link mechanism 72 can be configured without increasing the number of parts. When the separate fixed bracket 722 and the third bracket 43 are fixed in an integrated state as in this embodiment, the fixing position of the fixed bracket 722 can be appropriately adjusted, making it easier to design the armrest 7 including the link mechanism 72.

[0116] The bearing member 723 (also called a bush) is formed in a cylindrical shape with a cylindrical hole portion 723a, and a pivot pin 727 is inserted through the cylindrical hole portion 723a. The outer contour of cylindrical wall portion 723b constituting cylindrical hole portion 723a is formed in three stages with different diameters, and the portion with the longest diameter is fixed to mounting bracket 70. The portion with the shortest diameter is a portion that passes through each of the through-holes in main frame 71, first link 720, washer member 726 (described later), and pivot bracket 740 (described later).

[0117] The first rotating shaft member 724 is passed through the third through hole 720c in the first link 720 and the first through hole 721a in the second link 721, and connects the first link 720 and the second link 721 to each other so as to be freely rotatable. In this embodiment, a rivet is used as the first rotating shaft member 724, and after being passed through the third through hole 720c in the first link 720 and the first through hole 721a in the second link 721, the tip is crushed as shown in FIG. 22, thereby making it possible to connect the first link 720 and the second link 721.

[0118] The second rotating shaft member 725 is passed through the second through hole 721b of the second link 721 and the through hole of the fixed bracket 722, and connects the second link 721 and the fixed bracket 722 to be freely rotatable. In this embodiment, a rivet is used like the first rotating shaft member 724, and as shown in FIG. 22, the tip end is crushed so that the second link 721 and the fixed bracket 722 can be connected to each other.

[0119] The washer member 726 is a circular plate-shaped member having a through hole in the center, and is disposed so as to be sandwiched between the pivot pin 727 and a pivot bracket 740 which will be described later.

[0120] The pivot pin 727 is an axial member that is passed through the through hole 700 in the mounting bracket 70 . Such a pivot pin 727 includes a first shaft portion 727a having a short diameter formed at the tip, a second shaft portion 727b having a longer diameter than the first shaft portion 727a, and a flange portion 727c having an outer diameter longer than the inner diameter of the through hole of the washer member 726. The first shaft portion 727a and the second shaft portion 727b are passed through a cylindrical hole portion 723a of the bearing member 723, and the first shaft portion 727a is passed through a through hole 700 of the mounting bracket 70. The first shaft portion 727a is fixed to the inner surface side of the cover portion 70b of the mounting bracket 70. The flange portion 727 c is in contact with the outer surface of the washer member 726 .

[0121] The angle regulating means 74 is used together with the link mechanism 72 and the biasing member 73 to maintain the main frame 71 at a constant angle, and is configured to maintain the main frame 71 in a horizontal state when in use, and to maintain the stored state when in storage. Such an angle restriction means 74 includes a pivot bracket 740 and a stopper pin 741 .

[0122] Pivot bracket 740 is a plate-like body formed in a substantially elliptical shape, and a second hook portion 740a is integrally formed at the front end portion to which the other end of the tension spring, which is biasing member 73, is hooked. Second hook portion 740a protrudes in the same direction (outward) as first hook portion 712, and the position of the tip of second hook portion 740a in the protruding direction is set to be substantially equal to the position of the tip of first hook portion 712 in the protruding direction. In addition, a first through hole 740b is formed in the center of the pivot bracket 740, through which the cylindrical wall portion 723b of the bearing member 723 passes, and a second through hole 740c is formed in the rear end portion of the pivot bracket 740, through which the stopper pin 741 passes.

[0123] The stopper pin 741 functions to keep the main frame 71 in a horizontal state, and is passed through a second through hole 740 c in the pivot bracket 740 and a slot hole 710 b in the main frame 71 . In this embodiment, a rivet is used as the stopper pin 741, and after being passed through the second through hole 740c in the pivot bracket 740 and the slot hole 710b in the main frame 71, the tip is crushed, thereby enabling the main frame 71 and the pivot bracket 740 to be connected.

[0124] As shown in Figures 19 and 20, the link mechanism 72 is configured so that the seatback frame 3, the first link 720, and the second link 721 can rotate around joint A, joint B, joint C defined by the rotation center of the armrest 7, and joint D defined by the rotation shaft 4a which serves as the rotation center of the seatback frame 3. When the seatback frame 3 is reclined and the link mechanism 72 operates, the positions of joint B and joint D do not change because they are configured including the reclining mechanism 4. On the other hand, the positions of joint A and joint C change depending on the position of the seatback frame 3, and therefore the first link 720 and the second link 721 perform a rotational movement. The tension spring, which is the biasing member 73, biases the first hook portion 712 of the main frame 71 and the second hook portion 740a of the pivot bracket 740 in a direction that draws them together at a position above the pivot pin 727. At this time, a biasing force acts on the main frame 71 to rotate in the direction of the arrow Y1, but since the stopper pin 741 is in contact with the rear end of the slot hole 710b, the horizontal state of the main frame 71 (i.e., the armrest 7) ​​can be maintained. Moreover, such a horizontal state of the main frame 71 can be maintained even if the reclining angle of the seat back frame 3 is changed.

[0125] The stored state of the armrest 7 refers to a state in which the armrest 7 is rotated so that the length direction of the armrest 7 and the length direction of the seat back frame 3 are aligned, as shown in FIG. To put the armrest 7 in the stored state, the main frame 71 is rotated so as to be lifted upward. At this time, the stopper pin 741 is separated from the rear end of the slot hole 710b, and the biasing member 73 is displaced from a state in which it was above the pivot pin 727 to a state in which it is below the pivot pin 727. This biasing member 73 tries to pull the first hook portion 712 and the second hook portion 740a together, so that a biasing force acts on the main frame 71 to rotate in the direction of the arrow Y2. The reduction in the biasing force of the biasing member 73 (a state in which the tension spring, which is the biasing member 73, is fully compressed) and the position where the length direction of the armrest 7 and the length direction of the seat back frame 3 are aligned are aligned are aligned, so that the stored state of the main frame 71 (armrest 7) ​​can be maintained.

[0126] When the main frame 71 is moved from the stored state to the horizontal state, initially the biasing force of the biasing member 73 acts in the direction of arrow Y2. However, when the main frame 71 is rotated and moved downward against that biasing force, the stopper pin 741 and the rear end of the slot hole 710b gradually approach each other, and the position of the biasing member 73 also gradually shifts upward. When the position of the biasing member 73 is displaced above the pivot pin 727 and the stopper pin 741 and the rear end of the slot hole 710b are brought even closer, a biasing force acts on the main frame 71 in the direction of the arrow Y1. When the stopper pin 741 abuts against the rear end of the slot hole 710b, the main frame 71 is placed in a horizontal position, and the biasing force of the biasing member 73 enables the main frame 71 to maintain the horizontal position.

[0127] In the illustrated example, the main frame 71 is open toward the outside (to the right in this embodiment), but a cover frame (not shown) is provided to cover the open portion of the main frame 71. On top of that, cushion pads are provided around the main frame 71 and the cover frame, and then a skin is placed over them.

[0128] According to this embodiment, when the seatback frame 3 is tilted relative to the cushion frame 2 by the reclining mechanism 4 and the link mechanism 72 is displaced, the main frame 71 is maintained in a horizontal state by the angle restriction means 74 and the main frame 71 is urged forward in the rotational direction by the urging member 73, so that the main frame 71 can be maintained in a horizontal state within the range in which the link mechanism 72 can be displaced no matter what angle the seatback frame 3 is tilted to relative to the cushion frame 2 by the reclining mechanism 4. This makes it possible to maintain the armrest 7 in a horizontal state with a simpler structure than before.

[0129] In addition, since the biasing member 73 is a tension spring having one end hooked onto the first hook portion 712 of the main frame 71 and the other end hooked onto the second hook portion 740a of the angle restriction means 74, the first hook portion 712 of the main frame 71 can be pulled toward the second hook portion 740a of the angle restriction means 74, making it easy to bias the main frame 71.

[0130] Furthermore, in the stored state in which the main frame 71 is rotated rearward so that the longitudinal direction of the main frame 71 is aligned with the longitudinal direction of the side of the seatback frame 3, the biasing member 73 biases the main frame 71 rearward in the rotational direction. Therefore, regardless of the angle to which the seatback frame 3 is tilted relative to the cushion frame 2 by the reclining mechanism 4, the stored state of the main frame 71 can be maintained within the range in which the link mechanism 72 can be displaced.

[0131] [Modifications] The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit of the present invention. Modifications will be described below. The following modifications may be combined as far as possible. In addition, in each of the following modified examples, elements common to the above embodiment are given the same reference numerals, and descriptions thereof will be omitted or simplified.

[0132] [Variation 1] As shown in FIG. 24, in the seat frame 1 of this modified example, the left and right back side frames 30, 31A constituting the seat back frame 3 both have a closed cross-sectional structure. That is, in this modified example, unlike the above embodiment, the right back side frame 31A is integrally formed as a hollow body having a closed cross-sectional structure by joining a right divisional body 31a and a left divisional body 31b.

[0133] The right divisional body 31a is formed symmetrically to the left divisional body 30a in the above embodiment, and the left divisional body 31b is formed symmetrically to the right divisional body 30b in the above embodiment.

[0134] In addition, since the right-side back side frame 31A has a closed cross-sectional structure, a single upper pipe frame 32A extending laterally and a single middle pipe frame 32B extending laterally are used instead of the U-shaped upper pipe frame 32 in the above embodiment. Furthermore, in the reclining mechanism 4, instead of the third bracket 43 in the above embodiment, a second bracket 42 configured symmetrically to the second bracket 42 may be used. In this case, the right cushion side frame 21 in the cushion frame 2 may also have a closed cross-sectional structure like the left cushion side frame 20.

[0135] According to this modified example, the left and right back side frames 30, 31A that constitute the seatback frame 3 have a closed cross-sectional structure, so that the rigidity of the seatback frame 3 can be improved compared to when only one of them has a closed cross-sectional structure. Also, the seat belt guide bracket 34 can be attached not only to one back side frame 30 but also to both back side frames 30, 31A. For example, in a rear seat where three seats are arranged in a row, the guide bracket 34 may not be able to be provided on a seat that is narrow. In such a case, the left and right back side frames 30, 31A of one seat adjacent to the narrow seat are made to have a closed cross-sectional structure, and the guide bracket 34 for the narrow seat and the guide bracket 34 for the adjacent seat are attached to the upper ends of the frames. This makes it possible to deal with cases where the guide bracket 34 cannot be provided on a seat that is narrow.

[0136] [Modification 2] As shown in FIG. 24, the upper pipe frame 32 of the seat back frame 3 in this modified example is provided with a reinforcing frame 35. The reinforcing frame 35 is a diagonal member that is fixedly bridged diagonally between the lower pipe 32c of the upper pipe frame 32, the intermediate pipes 32b on the left and right of this lower pipe 32c, and the back side frame 30 on the left side. That is, one reinforcing frame 35 is arranged diagonally so as to straddle the bent portion between the lower pipe 32c and the intermediate pipe 32b, and the other reinforcing frame 35 is arranged diagonally so as to straddle the portion where the lower pipe 32c and the left back side frame 30 meet.

[0137] According to this modified example, a truss structure consisting of the left side back frame 30, the upper pipe frame 32, and the reinforcing frame 35 can be formed at the position where the upper pipe frame 32 is provided, thereby improving the rigidity of the area where the reinforcing frame 35 is provided, and ultimately the seat back frame 3.

[0138] [Modification 3] In the seat back frame 3 of this modified example, instead of the U-shaped upper pipe frame 32 in the above embodiment, an upper pipe frame 32C consisting of an upper pipe 32a and an intermediate pipe 32b, and a plate-shaped middle frame 32D are used, as shown in Figure 26.

[0139] The middle frame 32D is formed in a plate shape and is provided to span between the left and right back side frames 30, 31. In this embodiment, the middle frame 32D spans between the rear surfaces of the left and right back side frames 30, 31, but is not limited to this, and may span between the front surfaces or between the middle parts in the front-rear direction.

[0140] Furthermore, left and right connecting frames 36 are attached between the middle frame 32D and the lower pipe frame 33 in a spanning manner. The connecting frame 36 has a web and left and right flanges, and is provided not only to connect the middle frame 32D and the lower pipe frame 33 but also to improve the rigidity of the seat back frame 3 as a whole.

[0141] According to this modification, since the middle frame 32D is formed in a plate shape, other members such as a dynamic damper for vibration control and a cover for covering the seat back frame can be easily attached to the middle frame 32D. In addition, since the middle frame 32D and the lower pipe frame 33 can be connected to each other by the connecting frame 36, the connecting frame 36 can also be used to attach other members in the same manner as the middle frame 32D. Moreover, by connecting the middle frame 32D and the lower pipe frame 33, the rigidity of the seat back frame 3 can be improved.

[0142] [Modification 4] In the cushion frame 2 in this modified example, instead of the front pipe frame 23 in the above embodiment, a front pipe frame 23A is used in which the central portion 230 is bent backward and upward with respect to the left and right side end portions 231, 232, as shown in Figure 27.

[0143] More specifically, the front pipe frame 23A includes left and right side end portions 231, 232 held by the left and right cushion side frames 20, 21, and a central portion 230 provided between the left and right side end portions 231, 232. The central portion 230 is bent rearward and upward, while the left and right side ends 231, 232 extend forward. Between the central portion 230 and the left and right side end portions 231, 232 are bent portions 230a, 230b, and the direction in which the central portion 230 is bent is determined at the bent portions 230a, 230b.

[0144] Furthermore, pressure-receiving members 26a, 26b for receiving the load of a person seated in the vehicle seat are provided between a central portion 230 of the front pipe frame 23A and the back pipe frame 22 in a spanning manner. The pressure receiving members 26a, 26b are wires, and the seat front portions are bent upward to correspond to the central portion 230 of the front pipe frame 23A. The front end portion of one pressure receiving member 26a is bent into a U-shape and protrudes forward from the central portion 230. The front end portion of the other pressure receiving member 26b is hooked onto the central portion 230.

[0145] The seat rear portions of the pressure-receiving members 26a and 26b are hooked onto the back pipe frame 22. The intermediate portions of the pressure-receiving members 26a, 26b are set at a height position substantially equal to the left and right side ends 231, 232 of the front pipe frame 23A. Moreover, the pressure-receiving members 26a and 26b can provide a desired shape for the cushion frame.

[0146] A cushion pad (not shown) is provided and covered with a skin on the cushion frame 2. The cushion pad is formed so that the center of the front end portion bulges out in accordance with the protruding state of the central portion 230 of the front pipe frame 23A.

[0147] According to this modification, the center of the front end of the cushion frame 2 can be raised upward, so that the person sitting in the vehicle seat is less likely to move forward from the seat. This makes it possible to prevent the body from sinking in the event of a vehicle collision, for example. [Explanation of symbols]

[0148] 1 Seat frame 2 Cushion Frame 20 Cushion side frame 20a Left side split body 20b Right side split body 21 Cushion side frame 22 Back pipe frame 22a Mounted part 23 Front pipe frame 24 Anchor Point 3 Seat back frame 30 Backside Frame 30a Left side split body 30b Right side split body 31 Backside Frame 32 Upper pipe frame 33 Lower pipe frame 34 Guide bracket 4 Reclining mechanism 4a Rotation axis 40 Round Recliner 41 First bracket 42 Second bracket 42a flange 42b flange 42c Bent plate part 43 Third Bracket 5 Seat support 50 Horizontal slide rail 50a fixed rail 50b Movable rail 51 Horizontal slide rail 51a Fixed rail 51b Movable rail 52 Foot bracket 53 Foot bracket 54 Foot bracket 55 Foot bracket 56 Connecting member 6. Anti-peeling structure 60 Upper peel prevention part 602 Upper engagement part 61 Lower peeling prevention part 612 Lower engaging part 7 Armrest 70 Mounting bracket 71 Mainframe 710b Slot hole 712 First hook part 72 Link mechanism 720 First Link 721 Second Link 722 Fixing bracket 723 Bearing materials 724 First rotating shaft member 725 Second rotating shaft member 726 Washer parts 727 Pivot Pin 73 Pressing member 74 Angle control means 740 Pivot bracket 740a Second hook part 741 Stopper pin A Joint B Joint C-Joint D-Joint W Welding

Claims

1. A reinforcing structure for a vehicle seat, comprising: a cushion frame forming a framework of a seat cushion that supports a person's thighs and buttocks; a seat support part that supports the cushion frame on a floor of a vehicle; and a peeling prevention structure provided between the cushion frame and the seat support part, The seat support portion is a front and rear lateral slide rail provided on the underside of the cushion frame, the front and rear lateral slide rail including a fixed rail and a movable rail, and configured to slide the cushion frame in the left and right direction; a foot bracket attached to a rear lateral slide rail of the front and rear lateral slide rails to support the cushion frame, The peel-off prevention structure is An upper peeling prevention part fixed to the cushion frame side; a lower peeling prevention portion fixed to the foot bracket, the upper peeling prevention portion and the lower peeling prevention portion are engaged with each other in a state in which the cushion frame can be slid by the front and rear lateral slide rails, The upper peeling prevention portion is fixed to a back pipe frame provided at a rear end portion of the cushion frame, The fixing portion of the upper peeling prevention portion that is fixed to the back pipe frame has left and right flange portions that protrude toward the back pipe frame, and the left and right flange portions are joined and fixed to the back pipe frame, A mounting portion on which a child seat is mounted is welded to the back pipe frame, A vehicle seat reinforcement structure, characterized in that the upper peel-off prevention portion is arranged rearward of the attachment portion and at substantially equal positions in the left-right direction.

2. 2. The vehicle seat reinforcing structure according to claim 1, wherein the upper peel-off prevention portion has a flange shape formed below the positions of the left and right flange portions of the fixing portion.

3. The reinforcing structure for a vehicle seat according to claim 2, characterized in that the left and right flanges of the fixing portion and the flange shape formed below the positions of the left and right flange portions of the fixing portion are integrally formed.

4. The reinforcement structure for a vehicle seat as described in any one of claims 1 to 3, characterized in that a recess is formed in the left-right center of the fixing portion, the recess being recessed toward the back pipe frame.

5. The vehicle seat reinforcement structure according to claim 4, characterized in that the upper peeling prevention portion is welded to the back pipe frame at the position of the central recess of the fixing portion and the left and right flange portions of the fixing portion.

6. The reinforcement structure for a vehicle seat as described in claim 5, characterized in that the welding points of the attached portion to the back pipe frame and the welding points at the positions of the left and right flange portions of the fixing portion of the upper peel-off prevention portion are located at approximately equal positions in the left-right direction.

7. the upper peel-preventing portion has an upper engaging portion for engaging with the lower peel-preventing portion, the lower peeling prevention portion has a lower engagement portion that engages with the upper engagement portion of the upper peeling prevention portion, The upper engaging portion and the lower engaging portion are positioned to engage with each other, A reinforcement structure for a vehicle seat as described in any one of claims 1 to 6, characterized in that the portion of the upper engagement portion that engages with the lower engagement portion is formed longer in the left-right direction than the fixed portion.

8. A vehicle seat reinforcement structure comprising: a cushion frame forming a framework of a seat cushion that supports a person's thighs and buttocks; a seat back frame having a lower end supported by the seat cushion and forming a framework of a seat back that serves as a backrest; a seat support portion that supports the cushion frame on a floor of a vehicle; a peeling prevention structure provided between the cushion frame and the seat support portion; a cushion pad provided on the cushion frame and the seat back frame; and a skin that covers the cushion pad, The seat support portion is a front and rear lateral slide rail provided on the underside of the cushion frame, the front and rear lateral slide rail including a fixed rail and a movable rail, and configured to slide the cushion frame in the left and right direction; a foot bracket attached to a rear lateral slide rail of the front and rear lateral slide rails to support the cushion frame, The peel-off prevention structure is An upper peeling prevention part fixed to the cushion frame side; a lower peeling prevention portion fixed to the foot bracket, the upper peeling prevention portion and the lower peeling prevention portion are engaged with each other in a state in which the cushion frame can be slid by the front and rear lateral slide rails, The upper peeling prevention portion is fixed to a back pipe frame provided at a rear end portion of the cushion frame, The fixing portion of the upper peeling prevention portion that is fixed to the back pipe frame has left and right flange portions that protrude toward the back pipe frame, and the left and right flange portions are joined and fixed to the back pipe frame, A mounting portion on which a child seat is mounted is welded to the back pipe frame, A vehicle seat reinforcement structure, characterized in that the upper peel-off prevention portion is arranged rearward of the attachment portion and at substantially equal positions in the left-right direction.

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