Seat back

Abstract

To provide a seat frame capable of effectively regulating a path of a seat belt and securing stable load performance as one aspect.SOLUTION: The present invention includes an upper frame 100, a first side frame 200 coupled to one side of the upper frame 100, and a first belt bracket 500 coupled to a connection portion between the upper frame 100 and the first side frame 200 and configured to guide a seat belt, wherein the first belt bracket 500 includes a front bracket disposed in front of the connection portion between the upper frame 100 and the first side frame 200 and is manufactured separately from the front bracket and coupled to the front bracket, and a rear bracket disposed behind a connection portion between the upper frame 100 and the first side frame 200.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a seat back. [Background technology]

[0002] It is to be apparent that the material described in this section is merely provided as background information for the present invention and may not constitute prior art.

[0003] Fig. 1 shows a conventional vehicle seat that does not rotate. The three-point seat belt in a conventional vehicle seat is configured such that the first point P1 and the second point P2 are fixed to the vehicle body, and the third point P3 is fixed to the seat.

[0004] However, in the case of a rotatable seat frame, such as a seat in an autonomous vehicle, all three points, including points 1, 2, and 3, must be fixed to the seat frame. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Korean Patent Publication No. 10-1998-0008730 Summary of the Invention [Problem to be solved by the invention]

[0006] One aspect of the present invention is to provide a seat frame that can effectively regulate the route of a seat belt and ensure stable load-bearing performance. [Means for solving the problem]

[0007] As one aspect to achieve the above-mentioned object, the present invention provides a seat back including an upper frame, a first side frame connected to one side of the upper frame, and a first belt bracket connected to a connecting portion of the upper frame and the first side frame and guiding a seat belt, wherein the first belt bracket includes a front bracket disposed in front of the connecting portion of the upper frame and the first side frame, and a rear bracket manufactured separately from the front bracket, connected to the front bracket, and disposed behind the connecting portion of the upper frame and the first side frame.

[0008] The upper surface of the upper frame may have a straight section at a portion that enters the first belt bracket, and one side surface of the first side frame may have a straight section at a portion that enters the first belt bracket.

[0009] The front bracket may include a front bracket body that guides the seat belt passing through the front, a first front flange that extends rearward from one side of the front bracket body and is coupled to a first rear flange of the rear bracket, and a second front flange that extends rearward from one side of the front bracket body and is coupled to the upper frame.

[0010] The first front flange may be coupled to an upper surface of the upper frame, and the second front flange may be coupled to a front surface of the upper frame.

[0011] The upper frame may have a reinforcing back plate coupled to a periphery of a portion connected to the first side frame, and reinforcing a rear portion of the upper frame.

[0012] The rear bracket may include a rear bracket main body that guides the seat belt passing through the rear, a first rear flange that extends forward from one side of the rear bracket main body and is coupled to a first front flange of the front bracket, a second rear flange that extends forward from one side of the rear bracket main body and is coupled to a reinforcing back plate of the upper frame, and a third rear flange that extends downward from a lower portion of the rear bracket main body and is coupled to a rear of the first side frame.

[0013] The front bracket and the rear bracket may have longitudinal reinforcing ribs protruding from their outer surfaces.

[0014] The car seat may further include an insert panel extending vertically along the first side frame and coupled with the first side frame to form a closed cross section.

[0015] The front bracket may be coupled such that a lower region thereof covers the upper frame, the first side frame, and the insert panel.

[0016] The front bracket, the first side frame, and the upper frame may be coupled to each other in an overlapping state in the front-rear direction in an upper region of the first side frame.

[0017] The seat may further include a support wire, at least a portion of which is disposed within the closed cross section between the first side frame and the insert panel to reinforce rigidity.

[0018] The vehicle may further include a second side frame coupled to the other side of the upper frame, and a lower frame connecting the first side frame and the second side frame in the left-right direction at a lower portion, and the support wire may be coupled to the first side frame and the lower frame.

[0019] The support wire includes a first wire coupled to the first side frame and a second wire coupled to the lower frame, and the first wire includes a 1-1 wire formed extending in the front-to-rear direction in an upper region of the first wire, a 1-2 wire formed extending downward from a front end of the 1-1 wire, and a 1-3 wire formed in a lower region of the first wire and extending from the 1-2 wire in the second wire direction.

[0020] The first to third wires may be coupled to the first side frame around a pivot point where a coupling angle is adjusted as the seat frame and the seat back of the vehicle seat are rotated.

[0021] The vehicle may further include a second side frame coupled to the other side of the upper frame, a lower frame connecting the first side frame and the second side frame in the left-right direction at a lower portion, and a first reinforcing bracket coupled to a rear of the lower frame to form a closed cross section and to which a rear belt fastener is coupled.

[0022] The vehicle may further include a second reinforcing bracket coupled to a front of the lower frame to form a closed cross section. [Effects of the Invention]

[0023] According to one embodiment of the present invention, the route of the seat belt can be effectively restricted, and stable load performance can be ensured. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a diagram showing a state in which a seat belt is fastened to a conventional vehicle seat. [Figure 2] 1 is a diagram showing a state in which a seat belt is fastened to a vehicle seat according to the present invention; [Figure 3] FIG. 2 is a perspective view of the seat back of the present invention. [Figure 4]FIG. 4 is an exploded perspective view of the seat back of FIG. 3. [Figure 5] 1 is a view of a first belt bracket portion of a seat back according to the present invention as seen from behind. [Figure 6] FIG. 2 is a cross-sectional view of the seat back of the present invention in the "1" direction. [Figure 7] 1 is a view of a first belt bracket portion of a seat back according to the present invention as viewed from the front and bottom. [Figure 8] FIG. 2 is a cross-sectional view of the seat back of the present invention taken in the direction "2." [Figure 9] 10A and 10B are diagrams showing the installation state of the support wire of the seat back of the present invention. [Figure 10] FIG. 3 is a cross-sectional view of the seat back of the present invention taken along the line "3". [Figure 11] FIG. 4 is a cross-sectional view of the seat back of the present invention taken in the direction of "4". [Figure 12] 1 is a rear view of a first reinforcing bracket portion of a seat back according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various different forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, the embodiments of the present invention are provided to more completely explain the present invention to those having average knowledge in the art. The shapes and sizes of elements in the drawings may be exaggerated for clarity.

[0026] With reference to the drawings, the seat back of the present invention is shown in the left-right, up-down, and front-to-back directions, and the detailed description of the present invention also uses the terms left-right, up-down, and front-to-back, but this is for the convenience of explanation and it is made clear that the technical features of the seat back of the present invention are not limited to these directions.

[0027] In the following description, the X axis shown in the accompanying drawings is the front-to-rear direction of the seat back, the Y axis is the left-to-right direction of the seat back, and the Z axis is the up-and-down direction of the seat back.

[0028] Hereinafter, with reference to FIGS. 2 to 4, the components included in the seat back 20 according to one embodiment of the present invention will be described in detail.

[0029] FIG. 2 is a diagram showing the state in which a seat belt V is fastened to the vehicle seat of the present invention, FIG. 3 is a perspective view of the seat back 20 of the present invention, and FIG. 4 is a perspective view of the seat back 20 of FIG. 3 in an exploded state.

[0030] The vehicle seat may include a seat frame 10 and a seat back 20 .

[0031] A cushion is mounted on the seat frame 10 to support the buttocks of the occupant, and a seat back 20 to support the back of the occupant.

[0032] The seat back 20 is connected to the seat frame 10, and the seat back 20 may be installed so that its angle with respect to the seat frame 10 is adjustable. Specifically, the first side frame 200 of the seat back 20 may be connected to the seat frame 10 so that its angle with respect to the seat frame 10 is adjustable.

[0033] The upper frame 100 is formed to extend in the left-right direction, and may be disposed spaced apart in the up-down direction from a lower frame 400, which will be described later. The upper frame 100 may connect the first side frame 200 and the second side frame 300 at their upper parts in the left-right direction.

[0034] The first side frame 200 may be coupled to one side of the upper frame 100, and may be formed to extend in the vertical direction.

[0035] The first belt bracket 500 is coupled to a connecting portion of the upper frame 100 and the first side frame 200, and can guide the seat belt V. The first belt bracket 500 can be installed at the upper end portion of the seat back 20.

[0036] The first belt bracket 500 can support the load of the seat belt V passing through the front and rear of the first belt bracket 500. The first belt bracket 500 is connected to the upper frame 100 and the first side frame 200 and can serve to reinforce the upper frame 100 and the first side frame 200.

[0037] The first belt bracket 500 may include a front bracket 510 and a rear bracket 530 .

[0038] The front bracket 510 may be disposed in front of a connecting portion between the upper frame 100 and the first side frame 200. The rear bracket 530 may be manufactured separately from the front bracket 510, coupled to the front bracket 510, and disposed behind the connecting portion between the upper frame 100 and the first side frame 200.

[0039] A belt guide G1 for restricting left-right movement of the seat belt V may be installed on an upper portion of the rear bracket 530. A ring-shaped space through which the seat belt V passes may be formed in the belt guide G1.

[0040] A seat to which the seat back 20 of the present invention is applied is fitted with a three-point seat belt V (see FIG. 2), and the seat frame 10 is configured to rotate, so that all three points, including the first point P1, the second point P2, and the third point P3, which regulate the path of the seat belt V, can be installed on the seat itself.

[0041] One of the three points that regulate the path of the seat belt V may be formed on the first belt bracket 500, and two and three of the three points may be formed on the left and right sides of the seat frame 10, respectively.

[0042] The upper surface of the upper frame 10 may have a straight section at a portion where it enters the first belt bracket 500, and one side surface of the first side frame 200 may have a straight section at a portion where it enters the first belt bracket 500.

[0043] This allows the size of the first belt bracket 500 to be reduced, making it possible to reduce its weight. Furthermore, since the top surface of the upper frame 100 has a straight section, the weight of the upper frame 100 can be reduced.

[0044] The upper surface of the upper frame 100 around the first entry point where the upper frame 100 enters the first belt bracket 500 may have a straight section, and one side of the first side frame 200 around the second entry point where the first side frame 200 enters the first belt bracket 500 may have a straight section.

[0045] For example, the upper frame 100 may be formed to extend in the left-right direction, and the upper surface of the upper frame 100 may be configured with a straight section for half or more of the length of the upper frame 100 in the left-right direction.

[0046] For example, the first side frame 200 may be formed to extend in the vertical direction, and one side of the first side frame 200 may be formed of a straight section for more than half of the vertical length of the first side frame 200.

[0047] Here, the straight section may be a concept including a perfect straight line and a general straight line section including a slight bend in the straight line direction.

[0048] The front bracket 510 may include a front bracket body 511 , a first front flange 513 , and a second front flange 515 .

[0049] The front bracket body 511 can guide the seat belt V passing through the front.

[0050] The first front flange 513 is formed to extend rearward from one side surface of the front bracket body 511 and may be coupled to the first rear flange 533 of the rear bracket 530. The first front flange 513 may be coupled to the first rear flange 533 and the upper frame 100 simultaneously. The top surface of the upper frame 100, the first front flange 513, and the first rear flange 533 may be coupled to each other in an overlapping state from bottom to top.

[0051] The first front flange 513 may include a first front rearward plate 513a extending rearward from one side of the front bracket body 511 and coupled to the first rearward forward plate 533a of the first rear flange 533, and a first front coupling plate 513b extending from the underside of the first front rearward plate 513a in a direction intersecting with the right side and coupled to the upper surface of the upper frame 100.

[0052] The second front flange 515 may be formed to extend rearward from one side of the front bracket body 511 and may be coupled to the upper frame 100. The second front flange 515 may be coupled to the front surface of the upper frame 100.

[0053] The first front flange 513 may be coupled to the top surface of the upper frame 100 , and the second front flange 515 may be coupled to the front surface of the upper frame 100 .

[0054] The first front flange 513 may include a first front / rearward plate 513a formed to extend rearward from one side of the front bracket body 511 and coupled to the first rear flange 533, and a first front coupling plate 513b formed to extend from the underside of the first front / rearward plate 513a in a direction intersecting with the right side and coupled to the upper surface of the upper frame 100.

[0055] As an example, the second forward flange 515 may be coupled to both the front and lower surfaces of the upper frame 100 .

[0056] The upper frame 100 may have a reinforcing back plate 110 that is installed around the portion connected to the first side frame 200 and reinforces the rear of the upper frame 100. The reinforcing back plate 110 may also be installed around the portion connected to the second side frame 300 and reinforce the rear of the upper frame 100.

[0057] FIG. 5 is a view of the first belt bracket 500 portion of the seat back 20 of the present invention as seen from behind.

[0058] The aft bracket 530 may include an aft bracket body 531 , a first aft flange 533 , a second aft flange 535 , and a third aft flange 537 .

[0059] The rear bracket body 531 can guide the seat belt V passing through the rear.

[0060] The first rear flange 533 is formed to extend forward from one side of the rear bracket body 531 and can be coupled to the first front flange 513 of the front bracket 510 .

[0061] The first rear flange 533 may be disposed above the rear bracket body 531 in the vertical direction, and the second rear flange 535 may be disposed below the rear bracket body 531 in the vertical direction. The second rear flange 535 and the first rear flange 533 may be disposed spaced apart in the vertical direction. For example, two second rear flanges 535 may be disposed spaced apart, and one first rear flange 533 may be disposed.

[0062] The first rear flange 533 may include a first rear advancement plate 533a formed to extend forward from one side of the rear bracket body 531 and coupled to the first front rearward advancement plate 513a, and a first rear connecting plate 533b formed to extend from the underside of the first rear advancement plate 533a in a direction intersecting to the right and coupled to the first front connecting plate 513b of the first front flange 513.

[0063] The first rear connecting plate 533b may be connected to an upper side of the first front connecting plate 513b connected to the upper surface of the upper frame 100. For example, the upper surface of the upper frame 100, the first front connecting plate 513b, and the first rear connecting plate 533b may be connected by welding or the like in a state where they are stacked in the thickness direction from bottom to top.

[0064] The second rear flange 535 is formed to extend forward from one side of the rear bracket body 531 and can be coupled to the reinforcing back plate 110 of the upper frame 100 .

[0065] The second rear flange 535 may include a second rear forward-moving plate 535a formed by extending forward from one side of the rear bracket body 531, and a second rear connecting plate 535b formed by extending outward from the second rear forward-moving plate 535a in a direction intersecting the second rear forward-moving plate 535a and connected to the reinforcing back plate 110.

[0066] An open space is formed between the adjacent second rear flanges 535 and between the second rear flanges 535 and the first rear flange 533, thereby making it possible to reduce the weight of the first belt bracket 500.

[0067] The third rear flange 537 is formed to extend downward from the lower portion of the rear bracket body 531 and can be coupled to the rear of the first side frame 200.

[0068] The front bracket 510 and the rear bracket 530 may have longitudinal reinforcing ribs L protruding from their outer surfaces.

[0069] The vertical reinforcing ribs L may be formed to protrude from the front bracket 510 and the rear bracket 530 and extend in the up-down direction. A plurality of vertical reinforcing ribs L may be installed spaced apart in the left-right direction. For example, three vertical reinforcing ribs L may be arranged spaced apart in the left-right direction.

[0070] The vertical reinforcing ribs L are formed to protrude from the outer surfaces of the front bracket 510 and the rear bracket 530, thereby enabling the rigidity of the front bracket 510 and the rear bracket 530 to be reinforced.

[0071] Furthermore, the vertical reinforcing rib L formed on the rear bracket 530 can not only serve to reinforce the rigidity but also to prevent the seat belt V from slipping in the left-right direction.

[0072] FIG. 6 is a cross-sectional view of the seat back 20 of the present invention in the "1" direction.

[0073] The seat back 20 of the present invention may further include an insert panel 600 .

[0074] The insert panel 600 is formed to extend in the vertical direction along the first side frame 200 and can be combined with the first side frame 200 to form a closed cross section.

[0075] The first side frame 200 and the second side frame 300 have an open cross section with the inside of the seat back 20 open in the left and right directions, and the insert panel 600 is connected to the first side frame 200 and can form a closed cross section together with the first side frame 200 in the width direction of the seat back 20.

[0076] The insert panel 600 is joined to the first side frame 200 to form a closed cross section, thereby ensuring rigidity that can withstand the anchorage test of the seat belt V under severe conditions.

[0077] FIG. 7 is a view of the first belt bracket 500 portion of the seat back 20 of the present invention as viewed from the front lower side.

[0078] The front bracket 510 may be coupled such that its lower region covers the upper frame 100, the first side frame 200, and the insert panel 600. As a result, the front bracket 510 is coupled to the upper frame 100, the first side frame 200, and the insert panel 600, and can guide the seat belt V while being stably supported.

[0079] FIG. 8 is a cross-sectional view of the seat back 20 of the present invention taken along the line "2".

[0080] In the upper region of the first side frame 200, the front bracket 510, the first side frame 200 and the upper frame 100 may be coupled in an overlapping state in the front-rear direction.

[0081] A second overlapping region may be formed in the front-rear direction in the upper region of the first side frame 200, where the front bracket 510, the first side frame 200, and the upper frame 100 overlap.

[0082] With the front bracket 510, the first side frame 200, and the upper frame 100 arranged so as to overlap from front to rear, the front bracket 510, the first side frame 200, and the upper frame 100 can be joined in the thickness direction by welding or the like.

[0083] FIG. 9 is a diagram showing an installation state of the support wire 700 of the seat back 20 of the present invention.

[0084] The seat back 20 of the present invention may further include a support wire 700 .

[0085] At least a portion of the support wire 700 is disposed inside the closed cross section between the first side frame 200 and the insert panel 600 to reinforce rigidity.

[0086] The first side frame 200 and the insert panel 600 are joined to form a closed cross section, which primarily reinforces the rigidity, and at least a portion of the support wire 700 is arranged between the first side frame 200 and the insert panel 600, which secondarily reinforces the rigidity, thereby ensuring rigidity that can withstand the anchorage test of the seat belt V under harsh conditions.

[0087] The seat back 20 of the present invention may further include a second side frame 300 and a lower frame 400 .

[0088] The second side frame 300 may be coupled to the other side of the upper frame 100. The second side frame 300 may be formed to extend in the vertical direction and may be spaced apart from the first side frame 200 in the horizontal direction.

[0089] The lower frame 400 may connect the first side frame 200 and the second side frame 300 at their lower parts in the left-right direction. The lower frame 400 may be formed to extend in the left-right direction, and may be spaced apart from the upper frame 100 in the up-down direction.

[0090] The support wire 700 may be coupled to the first side frame 200 and the lower frame 400. The support wire 700 is coupled to the first side frame 200 and the lower frame 400 at the same time, thereby having the effect of reinforcing the rigidity of the connection portion between the first side frame 200 and the lower frame 400.

[0091] The support wire 700 includes a first wire 710 and a second wire 730 , and the first wire 710 can include a first-first wire 711 , a first-second wire 713 , and a first-third wire 715 .

[0092] The first wire 710 may be coupled to the first side frame 200 , and the second wire 730 may be coupled to the lower frame 400 .

[0093] The 1-1 wire 711 may be formed to extend in the front-rear direction in an upper region of the first wire 710 and may be coupled to the inner surface of the first side frame 200. The 1-2 wire 713 may be formed to extend downward from the front end of the 1-1 wire 711 and may be coupled to the inner surface of the first side frame 200. The 1-3 wire 715 may be formed to extend in a lower region of the first wire 710 and may be formed to extend from the 1-2 wire 713 in the direction of the second wire 730.

[0094] FIG. 10 is a cross-sectional view of the seat back 20 of the present invention taken along the line "3".

[0095] The first-third wire 715 may be coupled to the first side frame 200 around a rotation point R where the coupling angle is adjusted as the seat frame 10 and the seat back 20 of the vehicle seat rotate.

[0096] The support wire 700 is connected to the first side frame 200 of the seat back 20 around the connecting portion with the seat frame 10, thereby reinforcing the rigidity of the connecting portion between the seat back 20 and the seat frame 10.

[0097] FIG. 11 is a cross-sectional view of the seat back 20 of the present invention taken along the line "4", and FIG. 12 is a rear view of the first reinforcing bracket portion of the seat back of the present invention.

[0098] The seat back 20 of the present invention may further include a second side frame 300 , a lower frame 400 , and a first reinforcing bracket 800 .

[0099] The first reinforcing bracket 800 is coupled to the rear of the lower frame 400 to form a closed cross section, and a rear belt fixing device G2 may be coupled thereto. The first reinforcing bracket 800 is coupled to the rear of the lower frame 400, and the rear belt fixing device G2 may be coupled thereto.

[0100] The first reinforcing bracket 800 is coupled to the rear of the lower frame 400 to form a closed cross section together with the lower frame 400, thereby enabling the rigidity of the rear of the lower frame 400 to be reinforced.

[0101] The rear belt fastener G2 may fasten one end of the seat belt V. The rear belt fastener G2 may have a ring-shaped space formed therein to fasten one end of the seat belt V, and the seat belt V may be fastened in a state of passing through the ring-shaped space of the rear belt fastener G2.

[0102] The seat back 20 of the present invention may further include a second reinforcing bracket 900 .

[0103] The second reinforcing bracket 900 may be coupled to the front of the lower frame 400 to form a closed cross section.

[0104] As an example, a first reinforcing bracket 800 may be attached to the rear of the lower frame 400 to reinforce the rigidity of the rear of the lower frame 400, and a second reinforcing bracket 900 may be attached to the front of the lower frame 400 to reinforce the rigidity of the front of the lower frame 400.

[0105] The first reinforcing bracket 800 is connected to the rear of the lower frame 400 to form a closed cross section together with the lower frame 400, thereby reinforcing the rigidity of the rear of the lower frame 400, and the second reinforcing bracket 900 is connected to the front of the lower frame 400 to form a closed cross section together with the lower frame 400, thereby reinforcing the rigidity of the front of the lower frame 400.

[0106] As described above, the embodiments of the present invention have been described in detail, but the scope of the present invention is not limited thereto, and it is obvious to those having ordinary skill in the art that various modifications and variations are possible within the scope that does not deviate from the technical idea of ​​the present invention described in the claims. [Explanation of symbols]

[0107] 10: Seat frame 20: Seat back 100: Upper frame 110: Reinforced back plate 200: First side frame 300: Second side frame 400: Lower frame 500: First belt bracket 510: Front bracket 511: Front bracket body 513: First forward flange 513a: 1st forward and backward movement plate 513b: 1st front connecting plate 515: Second forward flange 530: Rear bracket 531: Rear bracket body 533: First rear flange 533a: 1st rear advancement plate 533b: 1st rear coupling plate 535: Second rear flange 535a: 2nd rear advancement plate 535b: 2nd rear coupling plate 537: Third rear flange 600: Insert Panel 700: Support wire 710: First wire 711: 1st-1st Wire 713: 1st-2nd wire 715: 1st-3rd wire 730: Second wire 800: First reinforcement bracket 900: Second reinforcement bracket G1: Belt guide G2: Rear belt fixing device L: Vertical reinforcing rib P1: First point P2: 2nd point P3: 3rd point R: Rotation point V: Seatbelt

[0108] [Article 1] Upper frame and a first side frame coupled to one side of the upper frame; a first belt bracket coupled to a connecting portion of the upper frame and the first side frame and guiding a seat belt, The first belt bracket is a front bracket disposed in front of a connecting portion between the upper frame and the first side frame; a rear bracket that is fabricated separately from the front bracket and connected to the front bracket, and that is positioned rearward of the connecting portion of the upper frame and the first side frame. [Clause 2] an upper surface of the upper frame having a straight section at a portion where the upper surface enters the first belt bracket; The seat back according to clause 1, wherein one side surface of the first side frame has a straight section in a portion that enters the first belt bracket. [Article 3] The front bracket is A front bracket body that guides the seat belt passing through the front; a first front flange extending rearward from one side of the front bracket body and coupled to a first rear flange of the rear bracket; The seat back described in clause 1, further comprising a second front flange formed to extend rearward from one side of the front bracket body and coupled to the upper frame. [Article 4] 4. The seat back of claim 3, wherein the first front flange is coupled to a top surface of the upper frame and the second front flange is coupled to a front surface of the upper frame. [Article 5] The seat back described in clause 1, wherein the upper frame has a reinforcing back plate joined to the periphery of the portion connected to the first side frame and reinforcing the rear of the upper frame. [Article 6] The rear bracket is A rear bracket body that guides the seat belt passing through the rear, a first rear flange extending forward from one side of the rear bracket body and coupled to a first front flange of the front bracket; a second rear flange extending forward from one side of the rear bracket body and coupled to a reinforcing back plate of the upper frame; The seat back described in clause 3, including a third rear flange formed extending downward from the lower part of the rear bracket body and coupled to the rear of the first side frame. [Article 7] Item 1. The seat back of item 1, wherein the front bracket and the rear bracket have longitudinal reinforcing ribs protruding from their outer surfaces. [Article 8] The seat back described in clause 1 further includes an insert panel formed extending in the vertical direction along the first side frame and coupled with the first side frame to form a closed cross section. [Article 9] The front bracket is 9. The seat back of claim 8, wherein a lower region is coupled to cover the upper frame, the first side frame, and the insert panel. [Article 10] The seat back described in clause 1, wherein the front bracket, the first side frame and the upper frame are joined in an overlapping state in the front-to-rear direction in the upper region of the first side frame. [Article 11] The seat back described in clause 8, further including a support wire, at least a portion of which is disposed within the closed cross section between the first side frame and the insert panel to reinforce rigidity. [Article 12] a second side frame coupled to the other side of the upper frame; a lower frame connecting the first side frame and the second side frame at a lower portion in the left-right direction, 12. The seat back of claim 11, wherein the support wire is coupled to the first side frame and the lower frame. [Article 13] The support wire is a first wire coupled to the first side frame; a second wire coupled to the lower frame, The first wire is a 1-1 wire formed in an upper region of the first wire and extending in the front-rear direction; a first-second wire extending downward from a front end of the first-first wire; Item 13. The seat back of item 12, including a 1-3 wire formed in a lower region of the first wire and extending from the 1-2 wire in the direction of the second wire. [Article 14] The first to third wires are The seat back according to Clause 13, wherein the seat back is connected to the first side frame around a pivot point where the connection angle is adjusted as the seat frame of the vehicle seat and the seat back rotate. [Article 15] a second side frame coupled to the other side of the upper frame; a lower frame connecting the first side frame and the second side frame at lower portions in the left-right direction; The seat back described in clause 1 further includes a first reinforcing bracket that is connected to the rear of the lower frame to form a closed cross section and to which a rear belt fixing device is connected. [Article 16] Item 16. The seat back according to item 15, further comprising a second reinforcing bracket coupled to a front of the lower frame to form a closed cross section.

Claims

1. Upper frame and a first side frame coupled to one side of the upper frame; a first belt bracket coupled to a connecting portion of the upper frame and the first side frame and configured to guide a seat belt; The first belt bracket is a front bracket disposed in front of a connecting portion between the upper frame and the first side frame; a rear bracket coupled to the front bracket and disposed rearward of a connecting portion of the upper frame and the first side frame, The front bracket is A front bracket body that guides the seat belt passing through the front; a first front flange extending rearward from one side of the front bracket body and coupled to a first rear flange of the rear bracket; a second front flange formed to extend rearward from one side of the front bracket body and coupled to the upper frame, The rear bracket is A rear bracket body that guides the seat belt passing through the rear, a first rear flange extending forward from one side of the rear bracket body and coupled to a first front flange of the front bracket; a third rear flange extending downward from a lower portion of the rear bracket body and coupled to a rear of the first side frame.

2. an upper surface of the upper frame having a straight section at a portion where the upper surface enters the first belt bracket; The seat back according to claim 1 , wherein the one side surface of the first side frame has a straight section in a portion that enters the first belt bracket.

3. 2. The seat back of claim 1, wherein the first forward flange is coupled to a top surface of an upper frame and the second front flange is coupled to a front surface of the upper frame.

4. The seat back according to claim 1 , wherein the upper frame has a reinforcing back plate joined to a periphery of a portion connected to the first side frame, the reinforcing back plate reinforcing a rear portion of the upper frame.

5. The rear bracket is The seat back of claim 1 , further comprising a second rear flange extending forward from one side of the rear bracket body and coupled to a reinforcing back plate of the upper frame.

6. The seat back according to claim 1 , wherein the front bracket and the rear bracket have vertical reinforcing ribs protruding from their outer surfaces.

7. A seat back as described in claim 1, further comprising an insert panel formed to extend in the vertical direction along the first side frame and coupled to the first side frame to form a closed cross section.

8. The front bracket is The seat back according to claim 7 , wherein a lower region is coupled to cover the upper frame, the first side frame, and the insert panel.

9. The seat back according to claim 1 , wherein the front bracket, the first side frame, and the upper frame are coupled to each other in an overlapping state in the front-rear direction in an upper region of the first side frame.

10. A seat back as described in claim 7, further comprising a support wire, at least a portion of which is positioned within the closed cross section between the first side frame and the insert panel to reinforce rigidity.

11. a second side frame coupled to the other side of the upper frame; a lower frame connecting the first side frame and the second side frame at a lower portion in the left-right direction, The seat back according to claim 10 , wherein the support wire is coupled to the first side frame and the lower frame.

12. The support wire is a first wire coupled to the first side frame; a second wire coupled to the lower frame, The first wire is a 1-1 wire formed in an upper region of the first wire and extending in the front-rear direction; a first-second wire extending downward from a front end of the first-first wire; a first-third wire formed in a lower region of the first wire and extending from the first-second wire in a direction toward the second wire.

13. The first to third wires are The seat back according to claim 12, wherein the seat back is coupled to the first side frame around a pivot point where a coupling angle between the seat frame and the seat back of the vehicle seat is adjusted as the seat frame and the seat back rotate.

14. a second side frame coupled to the other side of the upper frame; a lower frame connecting the first side frame and the second side frame at lower portions in the left-right direction; The seat back according to claim 1 , further comprising: a first reinforcing bracket coupled to the rear of the lower frame to form a closed cross section, the first reinforcing bracket being coupled to a rear belt fixing device.

15. The seat back according to claim 14 , further comprising a second reinforcing bracket coupled to a front of the lower frame to form a closed cross section.

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