Vehicle seats

Abstract

To obtain a vehicular seat which has simple structure and can absorb shock.SOLUTION: A vehicular seat comprises a right side lower frame 78A, a left side lower frame 78B, and joint members 88, 90 in a lower frame 78 of a seat back frame 21 (right side seat back portion 22, left side seat back portion 24, center seat back portion 26) in a seat back 16 that constitutes a front end of a luggage space 20 of a vehicle 10. The right side lower frame 78A and the left side lower frame 78B are located on a same straight line, and the right side lower frame 78A and the left side lower frame 78B are connected to each other by the joint members 88, 90. This results in deformation of the joint members 88, 90 with respect to collision of the seat back 16 from a back face, and thus the vehicular seat can absorb shock.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat. [Background Art]

[0002] Patent Document 1 below discloses a technology relating to a vehicle rear seat that contributes to reducing the forward movement amount of a headrest when luggage in a luggage compartment collides with the back surface of a seat back, and also contributes to suppressing an increase in mass and simplifying the structure. [Prior Art Document] [Patent Document]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2016-150732 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] Incidentally, in a rear seat of a vehicle, when the vehicle suddenly decelerates, luggage in the luggage compartment may collide with the back surface of the seat back due to inertial force. For this reason, a test (luggage compartment partition wall strength test) for evaluating safety against such a luggage collision is stipulated, and the seat back is required to be provided with an impact absorbing structure.

[0005] An object of the present invention, in consideration of the above facts, is to provide a vehicle seat that can absorb impact with a simple structure. [Means for Solving the Problem]

[0006] The vehicle seat according to the first embodiment comprises a lower frame that forms the lower end in the vertical direction of the seat and is provided along the seat width direction, which constitutes the lower end in the vertical direction of the seat of the seat back frame that constitutes the frame of the seat back that constitutes the front end of the cargo compartment of the vehicle, a right lower frame that constitutes the right side in the seat width direction, a left lower frame that is arranged on the same straight line as the right lower frame and constitutes the left side in the seat width direction, and a joint member that connects the right lower frame and the left lower frame.

[0007] In the vehicle seat according to the first embodiment, the lower frame, which is provided along the seat width direction and constitutes the lower end in the vertical direction of the seat of the seat back frame that constitutes the frame of the seat back that constitutes the front end of the cargo compartment of the vehicle, comprises a right lower frame, a left lower frame, and a joint member. The right lower frame constitutes the right side of the lower frame in the seat width direction, and the left lower frame constitutes the left side of the lower frame in the seat width direction. The right lower frame and the left lower frame are arranged on the same straight line, and the right lower frame and the left lower frame are connected by a joint member.

[0008] Thus, in this embodiment, the lower frame of the seat back frame is composed of two lower frames (right lower frame and left lower frame), so compared to, for example, a case where the lower frame is composed of one, the length is shortened, making it possible to improve rigidity. In other words, in this embodiment, deformation of the lower frame can be suppressed in the event of a collision with the rear of the seat back caused by luggage in the cargo area due to the sudden deceleration of the vehicle.

[0009] In this embodiment, the lower frame is divided into a right lower frame and a left lower frame. This allows for variations in the division position of the lower frame along the seat width direction, and variations in material and thickness between the right and left lower frames, thereby changing the strength and rigidity on the left and right sides in the seat width direction, improving the design flexibility for impact testing. Furthermore, dividing the lower frame into a right lower frame and a left lower frame improves workability during the manufacturing of vehicle seats.

[0010] In this embodiment, the right lower frame and the left lower frame are connected by a joint member, thereby enabling the transmission of load along the seat width direction between the right lower frame and the left lower frame via the joint member. Furthermore, deformation of the lower frame is suppressed in the event of a collision from the rear of the seat back, and impact absorption is possible as the joint member deforms.

[0011] In the second embodiment of the vehicle seat, the right lower frame and the left lower frame are rectangular tubular in shape, and the joint member is formed in a plate shape that covers the outer shape of the right lower frame and the left lower frame.

[0012] In the vehicle seat according to the second embodiment, the right lower frame and the left lower frame are rectangular tubular in shape, and the joint member is formed in the shape of a plate that covers the outer shape of the right lower frame and the left lower frame. In other words, in this embodiment, the joint member is in surface contact with the right lower frame and the left lower frame, and the load can be reliably transmitted between the right lower frame and the left lower frame along the width direction of the seat via the joint member.

[0013] Furthermore, since the right and left lower frames are rectangular tubes and the joint members are formed in a plate shape, it is easier to position the joint members relative to the right and left lower frames compared to the case where the right and left lower frames are cylindrical, improving assembly workability.

[0014] The vehicle seat according to the third embodiment is a vehicle seat according to the first or second embodiment, wherein the joint member is provided on the front side in the front-rear direction of the seat on the right lower frame and the left lower frame.

[0015] In the vehicle seat according to the third embodiment, joint members are provided on the front side of the seat in the longitudinal direction on the right lower frame and the left lower frame, thereby improving rigidity against impact loads directed towards the front side of the seat in the longitudinal direction during a collision from the back of the seat back.

[0016] The fourth embodiment of the vehicle seat is a vehicle seat according to any one of the first to third embodiments, wherein the joint member is provided on the upper surface side in the vertical direction of the seat on the right lower frame and the left lower frame.

[0017] In the vehicle seat according to the fourth embodiment, joint members are provided on the upper surface side in the vertical direction of the seat on the right lower frame and the left lower frame, thereby improving the rigidity of the upper surface side in the vertical direction of the seat on the right lower frame and the left lower frame.

[0018] The fifth embodiment of the vehicle seat is a vehicle seat according to any one of the first to fourth embodiments, wherein a gap is provided between the right lower frame and the left lower frame.

[0019] In the vehicle seat according to the fifth embodiment, a gap is provided between the right lower frame and the left lower frame, which allows for the absorption of dimensional variations in the right and left lower frames during manufacturing. Furthermore, the gap between the right and left lower frames provides a deformation allowance when the joint member deforms.

[0020] The sixth embodiment of the vehicle seat is a vehicle seat according to any one of the first to fifth embodiments, wherein the joint member is provided at the center of the lower frame of the center seat back, which is located in the center of the seat width direction of the seat back.

[0021] In the vehicle seat according to the sixth embodiment, a joint member is provided at the center of the lower frame of the center seat back, which is located in the center of the seat width direction of the seat back, thereby improving rigidity in areas that are more susceptible to deformation from impacts from the rear of the seat back.

[0022] The seventh embodiment of the vehicle seat is a vehicle seat according to any one of the first to sixth embodiments, wherein the lower frame further comprises a right-side fitting frame in which the right lower frame is hollow and fitted inside the right lower frame, with a portion of the right lower frame exposed from the left lower frame side end, and a left-side fitting frame in which the left lower frame is hollow and fitted inside the left lower frame, with a gap between it and the right-side fitting frame, with a portion of the left lower frame exposed from the right lower frame side end, and the joint member connects the exposed portion of the right-side fitting frame and the exposed portion of the left-side fitting frame.

[0023] In the vehicle seat according to the seventh embodiment, the right lower frame is hollow, and a right fitting frame is fitted inside the right lower frame, with a portion of the right fitting frame exposed from the left lower frame side end of the right lower frame. The left lower frame is also hollow, and a left fitting frame is fitted inside the left lower frame. A portion of the left fitting frame is exposed from the right lower frame side end of the left lower frame, with a gap between it and the right fitting frame. The joint member connects the exposed portion of the right fitting frame and the exposed portion of the left fitting frame.

[0024] In the present aspect, a right fitting frame is fitted into the right lower frame, a left fitting frame is fitted into the left lower frame, and each of the right lower frame and the left lower frame has a double-pipe structure.

[0025] This makes it possible to improve the rigidity of the right lower frame and the left lower frame. Since the right fitting frame and the left fitting frame are respectively fitted into the right lower frame and the left lower frame, they are formed smaller than the outer contours of the right lower frame and the left lower frame.

[0026] For this reason, when the joint member connects the exposed portion of the right fitting frame and the exposed portion of the left fitting frame, it can be set such that the joint member does not protrude from the outer contours of the right lower frame and the left lower frame.

[0027] A vehicle seat according to an eighth aspect is the vehicle seat according to any one of the first to seventh aspects, wherein through holes are formed at both ends of the joint member in the seat width direction.

[0028] In the vehicle seat according to the eighth aspect, since through holes are formed at both ends of the joint member in the seat width direction, positioning of the joint member can be performed through the through holes. Advantageous Effects of the Invention

[0029] The vehicle seat according to the present invention has an excellent effect that it can absorb impact with a simple structure. Brief Description of the Drawings

[0030] [Figure 1] Fig. 1 is a front view showing a skeleton of a seat back of a vehicle seat according to the present embodiment. [Figure 2] Fig. 2 is an essential-part front view showing an essential part of a seat back of a vehicle seat according to the present embodiment. [Figure 3]This is a partially disassembled perspective view of the main part of the seat back of the vehicle seat according to this embodiment, viewed from the right front and slightly to the side. [Figure 4] This is a perspective view from the front and slightly above, showing the main part of the seat back of the vehicle seat according to this embodiment. [Figure 5] This is an enlarged front view of the main part, showing an enlarged view of the main part of Figure 2. [Modes for carrying out the invention]

[0031] Hereinafter, a vehicle seat according to an embodiment of the present invention will be described with reference to the drawings. In the drawings, arrow FR indicates the forward direction in the seat's longitudinal direction, arrow UP indicates the upward direction in the seat's vertical direction, and arrow RH indicates the right direction in the seat's width direction. Hereafter, when simply referring to the front-rear, left-right, and up-down directions, unless otherwise specified, they refer to the front-rear direction of the seat, the left-right direction in the seat's width direction, and the up-down direction of the seat.

[0032] (Vehicle seat configuration) First, the configuration of the vehicle seat according to this embodiment will be described.

[0033] As shown in Figure 1, the vehicle seat according to this embodiment is a rear seat 12 positioned further rearward in the vehicle's longitudinal direction than the front seat (not shown). This rear seat 12 is broadly divided into a seat cushion 14 that supports the buttocks and thighs of the seated occupant, a seat back 16 that can support the upper body of the seated occupant seated on the seat cushion 14, and a headrest 18 that can support the head of the seated occupant.

[0034] Here, the seatback 16 constitutes the front end of the luggage space 20, which is the cargo area of ​​the vehicle 10, and comprises a right seatback section 22 located on the right side of the vehicle, a left seatback section 24 located on the left side of the vehicle, and a center seatback section 26 provided between the right seatback section 22 and the left seatback section 24 and located in the center in the vehicle width direction.

[0035] The right seat back portion 22 is provided with a right seat back frame portion 28, which forms the skeleton of the right seat back portion 22, and the left seat back portion 24 is provided with a left seat back frame portion 30, which forms the skeleton of the left seat back portion 24. In addition, the center seat back portion 26 is provided with a center seat back frame portion 32, which forms the skeleton of the center seat back portion 26.

[0036] The right seat back frame section 28 is made of metal and is formed in a frame shape when viewed from the front-rear direction of the vehicle. The right seat back frame section 28 is composed of a right side frame section 34 and a left side frame section 36 that extend in the height direction of the right seat back section 22, an upper frame section 38 that connects the upper ends of the right side frame section 34 and the left side frame section 36 in the seat width direction, and a lower frame section 40 that connects the lower ends of the right side frame section 34 and the left side frame section 36 in the seat width direction.

[0037] Furthermore, the left seat back frame section 30, like the right seat back frame section 28, is made of metal and is formed in a frame shape when viewed from the front-rear direction of the vehicle. The left seat back frame section 30 is composed of a right side frame section 42 and a left side frame section 44 that extend in the height direction of the left seat back section 24, an upper frame section 46 that connects the upper ends of the right side frame section 42 and the left side frame section 44 in the vehicle width direction, and a lower frame section 48 that connects the lower ends of the right side frame section 42 and the left side frame section 44 in the vehicle width direction.

[0038] Furthermore, the center seat back section 26, like the right seat back section 22 and the left seat back section 24, is made of metal and is formed in a frame shape when viewed from the front-rear direction of the vehicle. The center seat back section 26 also includes a right side frame section 50 and a left side frame section 52 that extend in the height direction of the center seat back section 26, an upper frame section 54 that connects the upper ends of the right side frame section 50 and the left side frame section 52 in the seat width direction, and a lower frame section 56 that connects the lower ends of the right side frame section 50 and the left side frame section 52 in the vehicle width direction.

[0039] At both ends of the lower frame section 40 in the seat width direction, metal plate-shaped brackets 58 and 60 are provided, respectively, that stand upright toward the upper side of the seat. The right side frame section 34 and the left side frame section 36 are connected via these brackets 58 and 60 (connecting sections 62 and 64).

[0040] Furthermore, metal plate-shaped brackets 66 and 68 are provided at both ends of the lower frame section 48 in the seat width direction, respectively, and the right side frame section 42 and the left side frame section 44 are connected via these brackets 66 and 68 (connecting sections 70 and 72). The left side frame section 52 of the center seat back section 26 is connected to bracket 66 (connecting section 74).

[0041] The right seat back section 22, the center seat back section 26, and the left seat back section 24 are rotatable around the axis P at connecting sections 62, 64, 74 and 70, 72, and are each rotatable forward. When the right seat back section 22 and the center seat back section 26 rotate around the axis P, they rotate as a single unit while connected to each other.

[0042] In this embodiment, the rear seat 12 is configured as a 6:4 split-folding seat, for example. However, the rear seat 12 is not limited to a 6:4 split, and may be applied to, for example, a 5:5 split-folding seat, a 4:2:4 split-folding seat, or the like.

[0043] Furthermore, the center seat back portion 26 is rotatable around a hinge portion 76 provided along the seat width direction above the axis line P, and can be folded forward. When folded forward, the center seat back portion 26 functions as an armrest to support the elbows, etc., of seated occupants seated on the right seat back portion 22 and the left seat back portion 24.

[0044] As described above, in this embodiment, the right seat back portion 22 is provided with a lower frame portion 40, and the left seat back portion 24 is provided with a lower frame portion 48. In addition, the center seat back portion 26 is provided with a lower frame portion 56. In other words, the lower frame 78 in the seat back 16 is composed of the lower frame portion 40, the lower frame portion 48, and the lower frame portion 56, but there are no dedicated members in the lower frame portion 56.

[0045] To explain in more detail, the lower frame 78 consists of two parts, one on the left and one on the right, in the seat width direction. It is divided into two parts, a right lower frame 78A and a left lower frame 78B, which are rectangular tubular metal parts. The right lower frame 78A and the left lower frame 78B are arranged on the same straight line, while the right lower frame 78A and the left lower frame 78B are spaced apart.

[0046] On the right side of the lower frame 78A, the right side frame portion 34 and left side frame portion 36 of the right seat back portion 22, and the right side frame portion 50 of the center seat back portion 26 are supported. On the other hand, on the left side of the lower frame 78B, the left side frame portion 52 of the center seat back portion 26, and the right side frame portion 42 and left side frame portion 44 of the left seat back portion 24 are supported.

[0047] Here, as shown in Figure 2, the left lower frame 78B side of the right lower frame 78A and the right lower frame 78A side of the left lower frame 78B are each double-tube structures. A metal rectangular tube-shaped right-side fitting frame 80, formed to match the inner shape of the right lower frame 78A, is fitted inside the right lower frame 78A. The right-side fitting frame 80 is positioned so as to straddle the bracket 64, and the left lower frame 78B side of the right-side fitting frame 80 is exposed from the right lower frame 78A (exposed portion 82).

[0048] Furthermore, a metal rectangular tubular left-side fitting frame 84, formed to match the inner shape of the left-side lower frame 78B, is fitted inside the left-side lower frame 78B. The left-side fitting frame 84 is positioned so as to straddle the bracket 66, and the right-side lower frame 78A side of the left-side fitting frame 84 is exposed from the left-side lower frame 78B (exposed portion 86). A gap t is provided between the exposed portion 82 of the right-side fitting frame 80 and the exposed portion 86 of the left-side fitting frame 84.

[0049] The exposed portion 82 of the right-side fitting frame 80 and the exposed portion 86 of the left-side fitting frame 84 are connected by metal joint members 88 and 90. The joint members 88 and 90 are formed to conform to the outer shapes of the right-side fitting frame 80 and the left-side fitting frame 84. In this embodiment, the right-side fitting frame 80 and the left-side fitting frame 84 are rectangular tubes.

[0050] As shown in Figures 3 to 5, the joint members 88 and 90 are roughly L-shaped, with one side 88A of the joint member 88 being able to abut against the upper surface 80A of the right fitting frame 80 and the upper surface 84A of the left fitting frame 84, and the other side 88B of the joint member 88 being able to abut against the rear surface 80B of the right fitting frame 80 and the rear surface 84B of the left fitting frame 84.

[0051] On the other hand, one side 90A of the joint member 90 is capable of contacting the front surface 80C of the right fitting frame 80 and the front surface 84C of the left fitting frame 84, while the other side 90B of the joint member 90 is capable of contacting the lower surface 80D of the right fitting frame 80 and the lower surface 84D of the left fitting frame 84.

[0052] Furthermore, a round through-hole 92 is formed at one end of the joint members 88 and 90 in the longitudinal direction (sheet width direction), and an elliptical through-hole 94 is formed at the other end of the joint members 88 and 90 in the longitudinal direction. The through-hole 94 is formed with the longitudinal direction of the joint members 88 and 90 as its length. For example, in this embodiment, the through-hole 92 is formed on the right-side fitting frame 80, and the through-hole 94 is formed on the left-side fitting frame 84.

[0053] The right-side fitting frame 80 and the left-side fitting frame 84 may be cylindrical (pipe-shaped), in which case the joint members 88 and 90 will form an arc shape along the outer shape of the right-side fitting frame 80 and the left-side fitting frame 84.

[0054] (Function and effect of vehicle seats) Next, the operation and effects of the vehicle seat according to this embodiment will be described.

[0055] As shown in Figures 1 and 2, in the vehicle seat according to this embodiment, the lower frame 78 of the seat back frame 21 (right seat back portion 22, left seat back portion 24, center seat back portion 26) of the seat back 16 that constitutes the front end of the luggage space 20 of the vehicle 10 is composed of a right lower frame 78A, a left lower frame 78B, and joint members 88 and 90.

[0056] The right lower frame 78A constitutes the right side of the lower frame 78 in the seat width direction, and the left lower frame 78B constitutes the left side of the lower frame 78 in the seat width direction. The right lower frame 78A and the left lower frame 78B are arranged on the same straight line and are connected by joint members 88 and 90.

[0057] Thus, in this embodiment, the lower frame 78 of the seat back frame 21 is composed of two right lower frame 78A and left lower frame 78B. For example, compared to a case where the lower frame 78 is composed of a single piece (not shown in the figure), the reduced length makes it possible to improve rigidity. In other words, in this embodiment, deformation of the lower frame 78 can be suppressed in the event of a collision from the rear of the seat back 16 by luggage in the luggage space 20 due to the rapid deceleration of the vehicle 10.

[0058] Furthermore, in this embodiment, the seat back 16 comprises a right seat back portion 22, a left seat back portion 24, and a center seat back portion 26 provided between the right seat back portion 22 and the left seat back portion 24. For this reason, as a comparative example, each of the right seat back portion 22, the left seat back portion 24, and the center seat back portion 26 can be provided with a lower frame portion, although not shown in the figures. In this case, three lower frame portions would be required, increasing the number of parts and consequently the cost.

[0059] In contrast, in this embodiment, the right seat back section 22, the left seat back section 24, and the center seat back section 26 can be handled by two lower frame sections (right lower frame 78A, left lower frame 78B), thus reducing the number of parts and consequently lowering costs.

[0060] Furthermore, in this embodiment, the lower frame 78 is divided into a right lower frame 78A and a left lower frame 78B. This makes it possible to change the division position of the lower frame 78 along the seat width direction, or to change the material and thickness of the right lower frame 78A and the left lower frame 78B, thereby changing the strength and rigidity on the left and right sides in the seat width direction, and improving the design freedom for impact testing. In addition, dividing the lower frame 78 into a right lower frame 78A and a left lower frame 78B improves the workability during the manufacturing of the rear seat 12.

[0061] In this embodiment, as shown in Figures 3 and 4, the right lower frame 78A and the left lower frame 78B are rectangular tubular in shape. A rectangular tubular right-side fitting frame 80 is fitted inside the right lower frame 78A, and a rectangular tubular left-side fitting frame 84 is fitted inside the left lower frame 78B.

[0062] Furthermore, on the right-side fitting frame 80, the exposed portion 82 on the left-side lower frame 78B is exposed from the right-side lower frame 78A, and on the left-side fitting frame 84, the exposed portion 86 on the right-side lower frame 78A is exposed from the left-side lower frame 78B. A gap t is provided between the exposed portion 82 of the right-side fitting frame 80 and the exposed portion 86 of the left-side fitting frame 84, and the exposed portion 82 of the right-side fitting frame 80 and the exposed portion 86 of the left-side fitting frame 84 are connected by joint members 88 and 90.

[0063] Thus, in this embodiment, the right-side fitting frame 80 is fitted into the right-side lower frame 78A, and the left-side fitting frame 84 is fitted into the left-side lower frame 78B, with the right-side lower frame 78A and the left-side lower frame 78B each having a double-tube structure.

[0064] This makes it possible to improve the rigidity of the right lower frame 78A and the left lower frame 78B. The right fitting frame 80 and the left fitting frame 84 are fitted into the right lower frame 78A and the left lower frame 78B, respectively, and are therefore formed to be smaller than the outer dimensions of the right lower frame 78A and the left lower frame 78B.

[0065] Therefore, by connecting the right-side fitting frame 80 and the left-side fitting frame 84 with the joint members 88 and 90, it becomes possible to set the joint members 88 and 90 so that they do not protrude from the outer shape of the right-side lower frame 78A and the left-side lower frame 78B.

[0066] Furthermore, in this embodiment, the right-side fitting frame 80 and the left-side fitting frame 84 are connected by joint members 88 and 90, thereby enabling the transmission of load along the sheet width direction between the right-side fitting frame 80, the right-side lower frame 78A, the left-side fitting frame 84, and the left-side lower frame 78B via the joint members 88 and 90.

[0067] Here, the joint members 88 and 90 are formed from L-shaped plate materials that cover the outer shapes of the right-side fitting frame 80 and the left-side fitting frame 84. In this embodiment, the joint members 88 and 90 are in surface contact with the right-side fitting frame 80 and the left-side fitting frame 84, and the load is reliably transmitted between the right-side fitting frame 80 and the left-side fitting frame 84 along the sheet width direction, including the ridges, via the joint members 88 and 90.

[0068] Furthermore, since the right-side fitting frame 80 and the left-side fitting frame 84 are rectangular tubes and the joint members 88 and 90 are formed in a plate shape, it is easier to position the joint members 88 and 90 relative to the right-side fitting frame 80 and the left-side fitting frame 84 compared to the case where the right-side fitting frame 80 and the left-side fitting frame 84 are cylindrical, improving assembly workability.

[0069] Furthermore, in this embodiment, joint members 90 are provided on the front surface 80C of the right fitting frame 80 and the front surface 84C of the left fitting frame 84, thereby improving the rigidity of the front surface 80C of the right fitting frame 80 and the front surface 84C of the left fitting frame 84 against impact loads directed forward in the seat front-rear direction during a collision from the rear of the seat back 16.

[0070] In this embodiment, the joint member 90 is substantially L-shaped, with one side 90A of the joint member 90 being able to abut against the front surface 80C of the right fitting frame 80 and the front surface 84C of the left fitting frame 84, and the other side 90B of the joint member 90 being able to abut against the lower surface 80D of the right fitting frame 80 and the lower surface 84D of the left fitting frame 84.

[0071] Therefore, in order to improve the rigidity of the front 80C of the right fitting frame 80 and the front 84C of the left fitting frame 84 against impact loads directed forward in the seat front-rear direction during a collision from the rear of the seat back 16, the plate thickness of one side 90A of the joint member 90 may be made thicker than the plate thickness of the other side 90B of the joint member 90.

[0072] Furthermore, in this embodiment, joint members 88 are provided on the upper surface 80A of the right-side fitting frame 80 and the upper surface 84A of the left-side fitting frame 84, thereby improving the rigidity of the upper surface 80A of the right-side fitting frame 80 and the upper surface 84A of the left-side fitting frame 84.

[0073] In this embodiment, the joint member 88 is substantially L-shaped, with one side 88A of the joint member 88 being able to abut against the upper surface 80A of the right fitting frame 80 and the upper surface 84A of the left fitting frame 84, and the other side 88B of the joint member 88 being able to abut against the rear surface 80B of the right fitting frame 80 and the rear surface 84B of the left fitting frame 84.

[0074] Therefore, in order to improve the rigidity of the upper surface 80A of the right-side fitting frame 80 and the upper surface 84A of the left-side fitting frame 84, the plate thickness of one side 88A of the joint member 88 may be made thicker than the plate thickness of the other side 88B of the joint member 88.

[0075] Furthermore, in this embodiment, impact absorption is possible when the joint members 88 and 90 deform in response to a collision from the rear of the seat back 16. In other words, in this embodiment, impact can be absorbed with a simple structure.

[0076] Furthermore, in this embodiment, a gap t is provided between the exposed portion 82 of the right-side fitting frame 80 and the exposed portion 86 of the left-side fitting frame 84. This allows for the absorption of dimensional variations in the right-side fitting frame 80 and the left-side fitting frame 84 during manufacturing. In addition, the gap t between the right-side fitting frame 80 and the left-side fitting frame 84 provides a deformation allowance when the joint members 88 and 90 deform.

[0077] On the other hand, the joint members 88 and 90 have a round through-hole 92 on the right-side fitting frame 80 and an elliptical through-hole 94 on the left-side fitting frame 84. The joint members 88 and 90 can be positioned through these through-holes 92 and 94.

[0078] Furthermore, by making one of the joint members 88 and 90 a round hole and the other an elliptical hole, dimensional variations that occur between the right-side fitting frame 80 and the left-side fitting frame 84 can be absorbed. Also, for example, if the plate thickness differs between one side 88A and the other side 88B of the joint member 88, the two sides can be distinguished by the hole diameter, number of holes, and position.

[0079] In this embodiment, the right lower frame 78A and the left lower frame 78B are given a double-pipe structure, but this is not necessarily required. In other words, the right fitting frame 80 and the left fitting frame 84 are not necessarily required, and the joint members 88 and 90 may be directly connected to the right lower frame 78A and the left lower frame 78B. In this case, a gap will be provided between the right lower frame 78A and the left lower frame 78B, but this gap is not necessarily required.

[0080] Furthermore, the present invention can be implemented with various modifications without departing from its spirit. Of course, the scope of the present invention is not limited to the embodiments described above. [Explanation of symbols]

[0081] 10 vehicles 12. Rear seat (vehicle seat) 20 Luggage space (cargo area) 21 Seat back frame 32 Center seat back frame section (center seat back) 56 Lower frame section (center section) 78 Lower Frame 78A Right side lower frame 78B Left lower frame 80 Right-side fitting frame 80A Top surface (upper surface in the vertical direction of the seat on the right lower frame) 80C Front (Front of the seat in the vertical direction on the right lower frame) 82 Exposed part 84 Left-side interlocking frame 84A Top surface (upper surface of the seat in the vertical direction on the left lower frame) 84C Front (Front view of the seat in the vertical direction on the left lower frame) 86 Exposed part 88 Joint Members 90 Joint Members 92 Through hole 94 Through holes t gap

Claims

1. The lower frame, which forms the lower end in the vertical direction of the seat and is provided along the width direction of the seat, is part of the seatback frame that constitutes the frame of the seatback that forms the front end of the vehicle's cargo area. The right lower frame, which constitutes the right side in the seat width direction, The left lower frame is positioned on the same straight line as the right lower frame and constitutes the left side in the seat width direction, A joint member connecting the right lower frame and the left lower frame, It consists of, A vehicle seat in which the joint member is provided at the center of the lower frame of the center seat back, which is located in the center of the seat width direction of the seat back.

2. The lower frame, which is provided along the seat width direction and constitutes the lower end in the vertical direction of the seat in the seat back frame that constitutes the frame of the seat back that constitutes the front end of the cargo compartment of the vehicle, The right lower frame, which constitutes the right side in the seat width direction, The left lower frame is positioned on the same straight line as the right lower frame and constitutes the left side in the seat width direction, A joint member connecting the right lower frame and the left lower frame, It is composed of including, The right lower frame is hollow and fitted inside the right lower frame, with a right fitting frame that is partially exposed from the left lower frame side end of the right lower frame, The left lower frame is hollow, and the left fitting frame is fitted inside the left lower frame, with a gap between it and the right fitting frame, and a portion of the left lower frame is exposed from the end on the right lower frame side of the left lower frame, It further includes, The aforementioned joint member connects the exposed portion of the right-side fitting frame and the exposed portion of the left-side fitting frame, and is configured not to protrude from the outer shape of the right-side lower frame and the left-side lower frame, for use as a vehicle seat.

3. The vehicle seat according to claim 2, wherein the joint member is provided at the center of the lower frame of the center seat back, which is provided at the center of the seat width direction of the seat back.

4. The vehicle seat according to claim 1 or claim 2, wherein the right lower frame and the left lower frame are tubular in shape, and the joint member is formed in the shape of a plate that covers the outer shape of the right lower frame and the left lower frame.

5. The vehicle seat according to claim 1 or claim 2, wherein the joint member is provided on the front side in the front-rear direction of the seat on the right lower frame and the left lower frame.

6. The vehicle seat according to claim 1 or 2, wherein the joint member is provided on the upper surface side in the vertical direction of the seat on the right lower frame and the left lower frame.

7. A gap is provided between the right lower frame and the left lower frame, as described in Claim 1 or Claim 2 for a vehicle seat.

8. The vehicle seat according to claim 1 or claim 2, wherein through holes are formed at both ends of the joint member in the width direction of the seat.

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