JP5430953B2 - BACK SHEET FRAME STRUCTURE OF VEHICLE SEAT HAVING STRAINED WIRE AND VEHICLE SEAT HAVING THE BACK SEAT FRAME STRUCTURE - Google Patents

Description

  The present invention relates to a back seat frame structure for a vehicle seat provided with a cable and a vehicle seat provided with the back seat frame structure. More specifically, the present invention relates to the width direction of the vehicle without causing an increase in weight. The present invention relates to a back seat frame structure of a vehicle seat provided with a cable that can prevent bending deformation with respect to a load, and a vehicle seat provided with the back seat frame structure.

Conventionally, a back seat frame structure is used as a structural frame of a back seat of a vehicle seat. For example, as disclosed in Patent Document 1, the back seat frame structure includes a pair of side frames 20A and 20B and a pair of side frames 20A and 20B that are spaced apart from each other in the width direction of the vehicle. The upper frame 22 to be connected and the lower frame 24 to connect the lower ends of the pair of side frames 20A and 20B are schematically configured, and the pair of side frames 20A and 20B, the upper frame 22 and the lower frame 24 form a box structure. For example, the vehicle is configured to withstand a load in the front-rear direction of the vehicle at the time of a front collision or a rear collision.

However, such a back seat frame structure for a vehicle seat has the following technical problems.
That is, the strength against the load in the width direction of the vehicle is insufficient, and the back seat frame structure itself causes bending deformation in the width direction of the vehicle.
More specifically, as shown in FIG. 12, during the cornering of the vehicle, the back seat frame structure has a direction of an arrow that is the width direction of the vehicle (in the case of right turn and left turn) due to the inertial force of the occupant. Is shown at once). In this case, the pair of side frames usually have a U-shaped cross section or a rectangular cross section, thereby ensuring a section modulus. However, the pair of side frames is mainly adapted to cope with bending moment loads due to vehicle longitudinal loads. In the case of a U-shaped cross section, the main side surface having a width in the front-rear direction of the vehicle constituting the outer shape and the overhanging flange portion rising inward from the front and rear edges of the main side surface It is formed in a U-shape and is arranged so that the wide main side surface portion faces the front-rear direction of the vehicle. For this reason, it cannot be said that the pair of side frames 20A and 20B has sufficient rigidity against the load in the width direction of the vehicle.
Therefore, as described above, bending deformation is caused in the width direction of the vehicle. If such bending deformation is small, the ride comfort of the occupant is adversely affected. If the vehicle speed during cornering is high, the deformation increases accordingly, which may adversely affect safe driving.

In this regard, for example, as disclosed in Patent Document 1, a reinforcement member 15 is provided to be diagonally spanned between the pair of side frames 20A and 20B in order to support the lateral component of the load. There is something.
However, reinforcement with a heavy steel plate like the reinforcement member 15 causes an increase in weight and an increase in cost.
JP-A-4-285506

In view of the above technical problems, an object of the present invention is for a vehicle equipped with a cable that can prevent deformation due to a load in the width direction of the vehicle without causing an increase in weight. An object of the present invention is to provide a back seat frame structure of a seat and a vehicle seat provided with the back seat frame structure.

In order to solve the above problems, the back seat frame structure according to the present invention is:
A back seat frame structure used for a back seat of a vehicle seat, a pair of side frames arranged at an interval in the width direction of the vehicle, and an upper frame connecting upper ends of each of the pair of side frames, In the back seat frame structure having a lower frame that connects the lower ends of each of the pair of side frames,
An oblique wire is stretched between one lower end of the pair of side frames and the other upper end of the pair of side frames,
From the one of the pair of side frames to which the lower end of the cable staying wire is fixed toward the other of the pair of side frames to which the upper end of the cable staying wire is fixed, in the width direction of the vehicle, with respect to the back seat frame structure In order to prevent the back seat frame structure from being bent and deformed when a load is applied, a tensile force is generated in the cable.

According to the back seat frame structure having the above configuration, when a load is applied in the width direction of the vehicle, for example, due to the inertial force of the occupant seated on the cushion seat accompanying the cornering of the vehicle, When a load is applied in a direction from one to the other, a force is generated that causes the upper portion of the back seat frame structure to bend and deform in the width direction of the vehicle.
At that time, the oblique wire stretched obliquely between the pair of side frames is stretched to generate a tensile force on the oblique wire, and the other upper ends of the pair of side frames to which the upper ends of the oblique wires are connected. This tensile force is transmitted to the back seat frame structure in a direction opposite to the flexural deformation of the back seat frame structure, and the light weight structure of the cable stayed in the back seat frame structure causes no increase in weight. Deformation can be substantially prevented. In addition, when a load is applied in the opposite direction in the width direction of the vehicle, the cable stays loosened, and the structural integrity of the cable stay can be maintained without resisting such a load. Is possible.

Furthermore, a cable is further stretched between the other lower end of the pair of side frames and one upper end of the pair of side frames,
From the other of the pair of side frames to which the lower end of the cable staying wire is fixed toward the one of the pair of side frames to which the upper end of the cable staying wire is fixed, in the width direction of the vehicle, with respect to the back seat frame structure Thus, it is preferable that a tensile force is generated on the cable, so that the back seat frame structure is not bent and deformed when a load is applied.

Furthermore, it is preferable that the cable stayed wire is made of a metal wire.
In addition, the cable-drawn wire may be made of a CFRP wire.
Furthermore, it is preferable that an upper end of the cable staying wire is provided in the vicinity of a connecting portion between the upper frame and the pair of side frames.
Furthermore, it is preferable that the lower end of the cable staying wire is provided in the vicinity of a connecting portion between the lower frame and the pair of side frames.
Furthermore, the cable staying wire preferably has a wire length adjusting mechanism.
Furthermore, the wire length adjusting mechanism is a bolt-nut mechanism, and it is preferable to adjust the length of the wire by adjusting the screwing amount of the bolt into the nut.
In addition, pulleys are respectively provided at one lower end portion of the pair of side frames and the other upper end portion of the pair of side frames, and the cable-drawn wire is endless and spanned between both pulleys. It is good to be.
Further, each of the pair of side frames includes a main side portion having a width in the front-rear direction of the vehicle constituting the outer shape and a protruding flange portion rising inward from the front and rear edges of the main side portion. Preferably, the pulley is provided on the outer surface of the overhanging flange portion on the rear side of the vehicle.

In addition, a pin is provided at each of the lower end of one of the pair of side frames and the upper end of the other of the pair of side frames, and the cable is composed of a single wire, A fixing ring into which the pin can be inserted is preferably provided.
Further, each of the pair of side frames includes a main side portion having a width in the front-rear direction of the vehicle constituting the outer shape and a protruding flange portion rising inward from the front and rear edges of the main side portion. It is preferable that the pin is provided on the outer surface of the overhanging flange portion on the rear side of the vehicle.

In order to solve the above-described problems, a vehicle seat according to the present invention includes:
A pad provided so as to cover the entire back seat frame structure according to any one of claims 1 to 12, and a bag provided so as to cover the back seat frame structure of the vehicle seat and the entire pad. It has the structure which has the shape-like skin.

Embodiments of a vehicle seat according to the present invention will be described below in detail with reference to the drawings, taking as an example the case of being applied to a front seat of an automobile.

FIG. 1 is a front view of a vehicle seat according to the first embodiment of the present invention. FIG. 2 is a partial perspective view of the back seat frame structure of the vehicle seat according to the first embodiment of the present invention viewed from the vehicle rear side. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is a detailed view of part B of FIG. FIG. 5 is a detailed view of part C of FIG. FIG. 6 is a diagram of a cable stay according to the first embodiment of the present invention. FIG. 7 is a detailed view of a portion D in FIG. FIG. 8 is a schematic view showing the operation of the back seat frame structure of the vehicle seat according to the first embodiment of the present invention.

As shown in FIGS. 1 and 2, a vehicle seat 10 according to the present invention includes a cushion seat frame structure portion 12 fixed to a passenger compartment floor (not shown) and a lower end portion of the cushion seat frame structure portion 12. A back seat frame structure portion 16 connected to the rear end portion so as to be tiltable and provided with a slanted wire 14 which will be described in detail later, and interposed between the back seat frame structure portion 16 and the cushion seat frame structure portion 12 A vehicle seat frame structure having a recliner structure portion 18, a pad (not shown) provided so as to cover the entire vehicle seat frame structure, and a frame structure of the vehicle seat and the entire pad. And a bag-shaped skin (not shown).

The back seat frame structure portion 16 has an inverted U-shape as a whole, and a pair of side frames 20A and 20B arranged vertically at a predetermined interval in the vehicle width direction, and an upper portion of the pair of side frames 20A and 20B. The upper frame 22 and the lower frame 24 that are respectively fixed laterally to the lower portion are configured as a square frame-like box structure.

As shown in FIG. 3, each of the pair of side frames 20 </ b> A and 20 </ b> B includes a main side part 26 having a width in the front-rear direction of the vehicle constituting the outer shape, and an overhanging flange rising inward from the front and rear edges of the main side part 26. The portions 28A and 28B are formed in a U shape with the cross section facing inward. Regarding the U-shaped cross-sectional shape or plate thickness of each of the pair of side frames 20A, 20B, the bending moment applied to the back seat frame structure 16 by the load in the longitudinal direction of the vehicle is the lower end of the pair of side frames 20A, 20B. In order to set the section modulus so as to withstand such a bending moment, the width of the main side surface portion 26 is tapered upward from the lower end portions of the pair of side frames 20A and 20B. It is set in a tapered shape.

Circular recesses 30A and B for connecting to the recliner structure 18 are provided at the lower part of the main side surface portion 26 of the side frame 20A, and the rotation axis XX passing through the center of each of the circular recesses 30A and B is the center. The back sheet can be tilted with respect to the cushion sheet.
The upper frame 22 is configured as an inverted U shape having a U-shaped cross section similar to that of the pair of side frames 20A and 20B. Both lower ends of the upper frame 22 are connected to the corresponding upper ends of the pair of side frames 20A and 20B in a fitting form. A bracket 32 for mounting a headrest is provided on the horizontal portion of the upper frame 22.
The lower frame 24 is fixed by welding, for example, to the lower ends of the pair of side frames 20A and 20B.

Explaining about the cable 14, as shown in FIG. 1, a pair of side frames are formed in the opening formed by the rectangular frame-shaped box structure in such a manner that the two cables 14 </ b> A and 14 </ b> B cross each other. It is spanned diagonally over 20A and B.
Since the two cable wires 14A and 14B have the same structure, only one of the cable wires 14A will be described below.

As shown in more detail in FIG. 2 (only the cable staying wire 14A is shown for clarity), the cable staying wire 14A is a single string and the cable staying wire 14A is a pair of side frames 20A, 20B. It is provided on the side surface 34B of the overhanging flange portion 28 located on the rear side of each vehicle. This is because the inclined wire 14 </ b> A hits an occupant seated on the back seat when it is provided on the overhanging flange portion 28 located on the front side of the vehicle.
The upper end 36 of the cable staying wire 14A is connected to the upper end part of the side frame 20B, while the lower end 38 of the cable staying wire 14A is connected to the lower end part of the side frame 20A.

More specifically, as shown in FIG. 4, the outer surface 34B of the overhanging flange 28 of the side frame 20B is provided with a pin 40B protruding from the outer surface 34B in the front-rear direction of the vehicle, while as shown in FIG. The outer surface 34B of the overhanging flange 28 of the side frame 20A is provided with a pin 20A that protrudes from the outer surface 34B in the vehicle front-rear direction. On the other hand, as shown in FIG. 6, fixing rings 42 </ b> A and B are fixed to each end of the cable 14 </ b> A, and openings 43 </ b> A and B of the fixing ring are inserted into the pins 40 </ b> A and B, respectively. Thus, the cable 14A is obliquely stretched between the pair of side frames 20A and 20B. Thereby, the cable 14A can be firmly supported by the pair of side frames 20A and 20B at the upper and lower ends thereof.

As will be described later, from the viewpoint of preventing bending deformation of the back seat frame structure due to the load in the width direction of the vehicle by the cable staying wire 14A, the oblique angle of the cable staying wire 14A is preferably as large as possible. The installation position of 40B is preferably as high as possible, and the installation position of the pin 40A is as low as possible. For example, the upper end 36 of the cable wire 14A may be provided in the vicinity of the connecting portion between the upper frame 22 and the side frame 20B, while the lower end 38 of the cable wire 14A may be connected to the lower frame 24 and the side frame 20A. It is good to be provided in the vicinity of the connecting portion.

In this regard, the installation position of the pin 40B is provided in the fitting portion between the upper frame 22 and the side frame 20B as shown in FIG. This is a portion where the upper frame 22 and the side frame 20B overlap each other, and is a portion that is reinforced in strength. As will be described later, a pair of fitting portions is formed by a tensile force generated in the cable tension wire 14A. When the load is transmitted to the side frames 20A, 20B, the structural soundness associated with such load transmission is maintained.

The type and material of the cable 14A are strong or rigid enough to ensure structural soundness when a load is applied in the vehicle width direction due to the inertial force of the occupant when the traveling vehicle corners. However, for example, metal or CFRP is preferable.

As shown in FIG. 7, the cable tension wire 14A is provided with a bolt-nut mechanism 130 corresponding to the wire length adjusting means. More specifically, each end of the cable-stayed wire 14A is provided with a male threaded bolt 132A, B, while a nut 134A, B having a female threaded inward from each end. 136 is provided. The amount of screwing is adjusted by screwing each bolt 132 to the corresponding bore 134, thereby adjusting the overall length of the wire while the cable 14A is stretched over, thereby The initial tensile force generated can be adjusted. According to such a configuration, in order to adjust the length of the wire, it is possible to adjust the length of the wire at two locations using the two bolts 132A and B.

In this case, in a normal state where no load is applied to the vehicle seat, the wire tension may be adjusted so that no tension is generated in the cable 14A and the wire does not loosen, or You may adjust the length of a wire so that it may be in the state which tension | tensile_strength generate | occur | produced in 14 A of cable staying wires. As a modification, a bolt 132 is provided at one end of the cable 14A and a nut 136 is provided at the other end, and the length of the wire can be adjusted by adjusting the screwing amount of the single bolt 132 into the nut 136. Good.

Note that such length adjustment of the cable 14A needs to be performed before the urethane pad is applied to the entire back seat frame structure 16.
When such a cable is loaded in the vehicle width direction in the direction from the side frame 20A toward the side frame 20B due to the inertial force of the occupant when the traveling vehicle is cornering, When a tensile force is applied to the back seat frame structure 16 based on the above, while a load in the opposite direction, that is, a load in the vehicle width direction from the side frame 20B toward the side frame 20A is applied. And, it has a characteristic that does not resist such a compressive load.

The effect | action is demonstrated below about the vehicle seat 10 which has the above structure.

First, when the vehicle seat 10 is completed, it is necessary to stretch the slanted wires 14A and B before embedding the pad in the vehicle seat frame structure. By adjusting the screwing amount with respect to the nut, the wire length of the cable is adjusted, so that when a load is applied to the back seat frame structure in the width direction of the vehicle, the cable is generated by the cable 14A. , B are adjusted in advance.

In this case, a tensile force may be generated in the cable wires 14A and 14B in a state where no load is applied to the back seat frame structure 16 in the width direction of the vehicle. B may be in a state where no tensile force is generated.
When the traveling vehicle corners (for example, turns left), as shown in FIG. 8 (A), the vehicle in the width direction of the vehicle with respect to the back seat frame structure 16 ( A load is applied. Thereby, one of the cable stays 14B is pulled, whereby a tensile force T against such a load acts on the back seat frame structure. Thereby, it is possible to prevent the upper part of the back seat frame structure 16 from being deformed as shown in FIG. On the other hand, one side 14A of the cable is squeezed and contracted. At this time, one side 14A of the cable is in a relaxed state without resisting such a compressive force. It is possible to ensure the sex.

Thereby, the occurrence of flexural deformation of the back seat frame structure 16 due to the load in the width direction of the vehicle caused by the cornering is prevented, and the riding comfort of the vehicle is ensured and contributes to the safety for driving the vehicle. Is possible. When a load is applied in the width direction of the vehicle in the direction opposite to that in FIG. 8A (for example, turning right), this time, as shown in FIG. Tensile force T is generated in the case, and the same effect as described above can be obtained.

According to the back seat frame structure 16 having the above configuration, when a load is applied in the width direction of the vehicle, for example, due to the cornering of the vehicle, due to the inertial force of the passenger sitting on the cushion seat, the pair of side frames 20A , B, when a load is applied in a direction from one to the other, a force is generated that causes the upper portion of the back seat frame structure 16 to bend and deform in the width direction of the vehicle.
At that time, the slanted wires 14A, B that are obliquely stretched between the pair of side frames 20A, B are stretched to generate a tensile force on the slanted wires 14A, B, and the upper ends of the slanted wires 14A, B This tensile force is transmitted to the other upper ends of the pair of side frames 20A, 20B connected to each other, thereby generating a force in the direction opposite to the bending deformation of the back seat frame structure 16, and a light-weight structure called a cable tension wire. The bending deformation of the back seat frame structure 16 can be substantially prevented without causing an increase in weight. In addition, when a load is applied in the opposite direction in the width direction of the vehicle, the cable stays loosened, and the structural integrity of the cable stay can be maintained without resisting such a load. Is possible.

Below, 2nd Embodiment of this invention is described, referring drawings. FIG. 9 is a partial perspective view of the back seat frame structure of the vehicle seat according to the second embodiment of the present invention as viewed from the vehicle rear side. FIG. 10 is a detailed view of a portion E in FIG. FIG. 11 is a detailed view of part F in FIG.

In the following description, the same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted, and the characteristic part of the present embodiment will be described in detail.
The feature of this embodiment is the structure of the cable wire 14, and more specifically, in the first embodiment, a single wire is adopted, whereas the pulleys 80A are respectively provided on the upper and lower portions of the side frames 20A and 20B. , B, and the endless wire formed between these pulleys 80A, 80B.

More specifically, the oblique wire 14A will be described. As shown in FIG. 10, the vehicle is fixed to the side frame 20B with respect to the outer side surface 34B on the vehicle rear side of the overhanging flange portion 28 of the side frame 20B. A pulley 80B is provided substantially in parallel with the outer side surface 34B via a pin 79A extending in the front-rear direction, and, as shown in FIG. 11, on the outer side surface 34B on the vehicle rear side of the overhanging flange portion 28 of the side frame 20A. On the other hand, a pulley 80A is provided substantially in parallel with the outer side surface 34B via a pin 79B fixed to the side frame 20A and extending in the front-rear direction of the vehicle, and the endless slanted wire 14A is stretched over both pulleys 80A and 80B. The structure is as follows. The pulleys 80A and 80B may be coupled to the pins so as to be rotatable about the axes of the pins 79A and B provided with the pulleys, or may not be rotatable.

In order to adjust the initial tension generated in the cable 14A, the bolt-nut mechanism 130 is provided in the middle of the wire, and the screw length of the bolt 132 with respect to the nut 136 is adjusted to adjust the length of the wire. This is common with the first embodiment.
In this way, by adopting a configuration in which an endless wire is spanned between the pulleys 80A and 80B, one slanted wire 14A that is substantially spanned between the side frames 20A and 20B is composed of two slanted wires. However, the bolt-nut mechanism 130 for adjusting the tension of the wire can be unified as in the first embodiment.

According to the cable 14 having such a configuration, for example, when a load similar to that in the first embodiment is assumed, in the first embodiment, one single wire is provided. This corresponds to the provision of two cable stays between the pulleys, so that the thickness of the wire can be reduced.

Although the embodiments of the present invention have been described in detail above, various modifications and variations can be made by those skilled in the art without departing from the scope of the present invention. For example, in the present embodiment, in the back seat frame structure, two oblique wires are provided so as to intersect between the pair of side frames 22A and 22B, but the pair of side frames is not limited thereto. One slanted wire may be provided between 22A and 22B, so that the seat back frame structure is flexibly deformed with respect to the load in the width direction of the vehicle accompanying either the left turn or the right turn. Can be prevented.
Moreover, it is good also considering a one wire as a single wire like 1st Embodiment among 2 cable-stayed wires, and a loop-like wire like 2nd Embodiment.
Furthermore, in the present embodiment, the description has been made for the automobile seat, but the present invention is not limited to this, and can be applied to general vehicles such as railway vehicles, ships, and airplanes. Further, when used for automobile seats, it can be applied to any of rear seats, particularly center seats and front seats of a three-seat seat.

The back seat frame structure of the back seat of the vehicle seat according to the present invention and the vehicle seat having the structure have a load in the width direction of the vehicle with respect to the back seat frame structure, for example, when a running vehicle corners. This prevents the back seat frame structure from flexing and deforming without causing an increase in weight when being loaded, which is useful in improving the riding comfort of the vehicle and ensuring safety.

1 is a front view of a vehicle seat according to a first embodiment of the present invention. It is the fragmentary perspective view seen from the vehicles back side of the back seat frame structure of the vehicle seat concerning a 1st embodiment of the present invention. It is sectional drawing of the AA arrow of FIG. FIG. 3 is a detailed view of part B in FIG. 2. FIG. 3 is a detailed view of part C in FIG. 2. It is a figure of the cable-stayed wire which concerns on 1st Embodiment of this invention. FIG. 3 is a detailed view of a D part in FIG. 2. It is the schematic which shows the effect | action of the back seat frame structure of the vehicle seat which concerns on 1st Embodiment of this invention. It is the fragmentary perspective view seen from the vehicle rear side of the back seat frame structure of the vehicle seat which concerns on 2nd Embodiment of this invention. FIG. 10 is a detailed view of part E in FIG. 9. FIG. 10 is a detailed view of a portion F in FIG. 9. It is a front view which shows the deformation | transformation of the back seat of the conventional vehicle seat.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Cushion seat frame structure 14A, B Oblique wire 16 Back seat frame structure 18 Recliner structure part 20A, B A pair of side frame 22 Upper frame 24 Lower frame 26 Main side part 28 Overhang flange part 30 Circular recessed part 32 Bracket 34 outer surface 36 upper end 38 lower end 42A, B fixing ring 40 opening 43A, B pulley 80A, B pulley 130 bolt-nut mechanism 132 bolt 134 bore 136 nut

Claims (13)

A back seat frame structure used for a back seat of a vehicle seat, a pair of side frames arranged at an interval in the width direction of the vehicle, and an upper frame connecting upper ends of each of the pair of side frames, In the back seat frame structure having a lower frame that connects the lower ends of each of the pair of side frames,
An oblique wire is stretched between one lower end of the pair of side frames and the other upper end of the pair of side frames,
From the one of the pair of side frames to which the lower end of the cable staying wire is fixed toward the other of the pair of side frames to which the upper end of the cable staying wire is fixed, in the width direction of the vehicle, with respect to the back seat frame structure When the load is applied in the opposite direction in the width direction of the vehicle , a tensile force is generated in the cable, so that the back seat frame structure is not bent and deformed when the load is applied. The back seat frame structure is characterized in that the cable stayed wire relaxes without resisting the load . Furthermore, a cable is further stretched between the other lower end of the pair of side frames and one upper end of the pair of side frames,
From the other of the pair of side frames to which the lower end of the cable staying wire is fixed toward the one of the pair of side frames to which the upper end of the cable staying wire is fixed, in the width direction of the vehicle, with respect to the back seat frame structure 2. The back seat frame structure according to claim 1, wherein a tensile force is generated in the cable staying wire so that a bending deformation does not occur with respect to the back seat frame structure when a load is applied. The back seat frame structure according to claim 1, wherein the cable is composed of a metal wire. The back seat frame structure according to claim 1, wherein the cable is made of CFRP.   2. The back seat frame structure according to claim 1, wherein an upper end of the cable is provided in the vicinity of a connecting portion between the upper frame and the pair of side frames.   The back seat frame structure according to claim 1, wherein a lower end of the cable is provided in the vicinity of a connection portion between the lower frame and the pair of side frames.     The backseat frame structure according to claim 1, wherein the cable is provided with a wire length adjusting mechanism. The back seat frame structure according to claim 7, wherein the wire length adjusting mechanism includes a bolt-nut mechanism, and adjusts the length of the wire by adjusting a screwing amount of the bolt with respect to the nut. Pulleys are respectively provided at one lower end of the pair of side frames and the other upper end of the pair of side frames, and the cable-drawn wire is endless and is spanned between both pulleys. The back seat frame structure according to claim 1. Each of the pair of side frames has a U-shaped cross section in which a main side portion having a width in the front-rear direction of the vehicle constituting the outer shape and an overhanging flange portion rising inward from the front and rear edges of the main side portion are inward. The back seat frame structure according to claim 9, wherein the pulley is formed in a shape, and the pulley is provided on an outer surface of an overhanging flange portion on a vehicle rear side. Pins are respectively provided at one lower end of the pair of side frames and the other upper end of the pair of side frames, and the cable is composed of a single wire, and the pins are provided at each end. The back seat frame structure according to claim 1, wherein a fixing ring into which can be inserted is provided. Each of the pair of side frames has a U-shaped cross section in which a main side portion having a width in the front-rear direction of the vehicle constituting the outer shape and an overhanging flange portion rising inward from the front and rear edges of the main side portion are inward. The back seat frame structure according to claim 11, wherein the back seat frame structure is formed in a shape, and the pin is provided on an outer surface of an overhanging flange portion on a vehicle rear side. A pad provided so as to cover the entire back seat frame structure according to any one of claims 1 to 12, and a bag provided so as to cover the back seat frame structure of the vehicle seat and the entire pad. A vehicular seat characterized by having an outer skin.

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