JP6236300B2 - Seat back frame - Google Patents

Description

  The present invention relates to a seat back frame, and particularly to a seat back frame formed by combining a front frame piece and a rear frame piece made of a resin material.

In order to reduce the weight of vehicle parts, resin molded products instead of metal materials may be used for the seat back frame.
For example, Patent Document 1 discloses a technique of molding by vibration welding a side frame of a seat back frame made of a resin molded product in order to reduce the weight of the seat back frame and improve the efficiency of assembly.
Specifically, the technique disclosed in Patent Document 1 is made up of two locations including a vertically extending welding protrusion formed on the outer half body and a vertically extending welding receiving portion formed on the inner half body. By vibrating and welding these parts, the seat back frame can be assembled relatively easily. Further, the inner half and the outer half constituting the side frame are fixed to each other to form a hollow closed cross section, thereby improving the rigidity.

JP 2004-328881 A

However, the vehicle seat back frame described in Patent Document 1 is not sufficient in terms of assembly efficiency.
Specifically, in order to make the side frame have a closed cross-sectional shape, it is necessary to perform vibration welding at two locations, that is, the welding protrusion and the welding receiving portion, and the portion to be subjected to vibration welding covers a wide range in the vertical direction. Since the positioning is difficult, the seat back frame cannot be efficiently assembled.

  Further, if all of the side frames have a closed cross-sectional shape, the cushioning property may be impaired due to the rigidity of the side frames, which may cause the seated person to feel uncomfortable. In addition, as in Patent Document 1, if two welding parts of the welding protrusion and the welding receiving part are on the side facing each other and have a closed cross-sectional shape, the welding part does not go around and change the viewpoint. The welding state of could not be confirmed.

  In addition, too much emphasis on weight reduction sometimes makes it impossible to secure necessary rigidity.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a seat back frame having high assembly efficiency.
Another object of the present invention is to reduce the uncomfortable feeling of a seated person sitting on a seat.
Another object of the present invention is to enable easy confirmation of the joining state between the front frame piece and the rear frame piece.
Another object of the present invention is to secure necessary rigidity while reducing the weight.

  According to the seat back frame of the present invention, the subject is a resin seat back frame composed of a front frame piece and a rear frame piece, and is provided at an end in the width direction of the seat back frame. The formed side frame is configured by combining a front side frame portion included in the front frame piece and a rear side frame portion included in the rear frame piece, and at one end portion in the width direction of the side frame, The front side frame portion and the rear side frame portion overlap each other in the width direction and are joined to each other, and at least a part of the other end portion in the width direction of the side frame includes the front side side. The frame portion and the rear side frame portion are separated from each other in the front-rear direction of the seat back frame. It is solved by forming a gap Te.

  If it is said structure, the clearance gap spaced apart without mutually overlapping between the front side frame part of a front frame piece and the rear side frame part of a rear frame piece is formed in the other end part of the width direction in a side frame. By doing so, compared to the case where they are overlapped and joined at both ends in the width direction, the joining work is reduced, so that the assembling efficiency when assembling them can be increased.

Moreover, it is preferable that the other end part of the said width direction exists in the inner side of the said width direction of the said seat back frame.
With the above configuration, there is a gap between the front frame piece and the rear frame piece on the inner side in the width direction of the seat back frame, so that the cushion material covering the seat back frame can enter the gap. Accordingly, it becomes easier to accept the seated person, the uncomfortable feeling of the seated person sitting on the seat can be reduced, and the device can be easily attached to the outside in the width direction of the side frame.

Further, at least one of the front frame piece and the rear frame piece is a portion on the outer side in the width direction of the seat back frame, and the front side frame portion and the rear side frame portion are arranged in the width direction. It is preferable that an opening that is open in the width direction is formed in the vicinity of the overlapping and bonded portion.
If it is said structure, the opening part opened in the width direction is formed in the vicinity of the site | part which has overlapped and joined the front side frame part and the rear side frame part in the width direction, and the front side frame part And the rear side frame portion can be easily confirmed from the opening.

Further, it is preferable that an elastic member attaching portion for attaching an elastic member erected in the width direction of the seat back frame is formed on the rear frame piece.
In the above configuration, by attaching the elastic member to the rear frame piece, the elastic deformation range of the elastic member can be widened to the rear side, and a seated person who is drooping backward can be suitably supported.

Furthermore, it is preferable that the elastic member mounting portion protrudes from the rear frame piece to the inside in the width direction of the seat back frame.
In said structure, the elastic member attaching part is the shape which protruded in the width direction inner side, and its own rigidity can be improved and also an elastic member can be arrange | positioned compactly in the width direction.

Further, a plurality of the elastic member mounting portions are formed in the vertical direction, and the front side frame portion and the rear side frame portion are between the elastic member mounting portions arranged in the vertical direction in the side frame. It is preferable that the other end portion in the width direction is overlapped and joined in the width direction.
In the above configuration, the front side frame portion and the rear side frame portion are overlapped and joined at the other end portion in the width direction between the elastic member mounting portions arranged above and below, so that it is rigid as a single unit. It is possible to improve the rigidity of the side frame as a whole, including the elastic member mounting portion that is structurally difficult to improve.

Further, the elastic member mounting portion has a convex shape that protrudes inward in the width direction of the seat back frame, and is formed so as to straddle a corner portion on the protruding portion side of the convex shape. It is preferable that the elastic member is inserted and latched in the hole.
If it is said structure, the elastic member attachment part is formed in convex shape, and has a hole formed so that the corner part with high rigidity in the projection part side of an elastic member attachment part may be straddled. It is possible to suppress a decrease in rigidity due to the formation of, and to easily attach the elastic member to the elastic member attaching portion.

Further, an airbag attachment portion for attaching an airbag case for storing an airbag is formed on the outer side in the width direction of the seat back frame at a portion constituting the side frame of the front frame piece or the rear frame piece. The front side frame portion and the rear side frame portion are joined in the width direction on the inner side in the width direction of the seat back frame at a portion where the airbag attachment portion is formed. Preferably.
With the above configuration, the airbag case mounting is achieved by joining the front frame piece and the rear frame piece overlapping in the thickness direction inside the width direction of the portion where the airbag mounting portion is formed. The rigidity in the vicinity of the part can be increased.

Further, the front side frame portion and the rear side frame portion are fixed by a fixture, and overlap in the width direction on the other end portion side in the width direction of a portion fixed by the fixture. It is preferable that they are joined together.
In the above configuration, the front frame piece and the rear frame piece are overlapped and joined in the width direction at the other end portion in the width direction of the portion fixed by the fixing tool, so that the rigidity in the vicinity of the fixing portion is obtained. Can be increased.

In addition, an armrest attachment portion to which an axis of rotation of the armrest is attached is formed on the outer side in the width direction of the seat back frame at a portion constituting the side frame of the front frame piece or the rear frame piece, It is preferable that the front side frame portion and the rear side frame portion are joined so as to overlap in the width direction inside the width direction of the portion where the armrest mounting portion is formed.
In the above configuration, the front frame piece and the rear frame piece are overlapped and joined in the width direction on the inner side in the seat width direction of the portion where the armrest mounting portion in the portion constituting the side frame is formed, The rigidity in the vicinity of the armrest mounting portion can be increased.

According to the seat back frame of the present invention, the gap between the front side frame portion of the front frame piece and the rear side frame portion of the rear frame piece that is not overlapped with each other is the other end in the width direction of the side frame. As a result of being formed in the portion, the work of joining is reduced as compared with the case where the two are joined at both ends in the width direction, so that the assembly efficiency in assembling the two can be increased.
Further, according to the seat back frame of the present invention, there is a gap between the front frame piece and the rear frame piece on the inner side in the width direction of the seat back frame, so that the cushion material is put on the gap in the gap. It is possible to allow a seated person to be accepted by allowing the seat to enter, to reduce the uncomfortable feeling of the seated person seated on the seat, and to easily attach the device to the outside in the width direction of the side frame.
Furthermore, according to the seat back frame of the present invention, the opening that opens in the width direction is formed in the vicinity of the portion that is joined to the front side frame portion and the rear side frame portion so as to overlap in the width direction. The joining state of the front side frame portion and the rear side frame portion can be easily confirmed from the opening.
Further, according to the seat back frame of the present invention, by attaching the elastic member to the rear frame piece, the elastic deformation range of the elastic member can be widened to the rear side, and a seated person who is drooping backward can be suitably supported.
Furthermore, according to the seat back frame of the present invention, the elastic member mounting portion has a shape projecting inward in the seat width direction, so that its own rigidity can be increased, and the elastic member can be made compact in the seat width direction. It can be arranged.
Furthermore, according to the seat back frame of the present invention, the front side frame portion and the rear side frame portion are joined to each other at the other end in the width direction between the elastic member mounting portions arranged vertically. As a result, the rigidity of the side frame as a whole can be improved, including the elastic member mounting portion that is structurally difficult to improve as a single unit.
Furthermore, according to the seat back frame of the present invention, the elastic member mounting portion is formed in a convex shape, and the hole formed so as to straddle the highly rigid corner portion on the protruding portion side of the elastic member mounting portion. By having it, the fall of the rigidity by forming a hole can be suppressed, and it becomes easy to attach an elastic member to an elastic member attaching part.
Furthermore, according to the seat back frame of the present invention, the front frame piece and the rear frame piece are overlapped and joined in the thickness direction on the inner side in the width direction of the portion where the airbag attachment portion is formed. The rigidity in the vicinity of the airbag case mounting portion can be increased.
Further, according to the seat back frame of the present invention, the front frame piece and the rear frame piece are joined in the thickness direction on the other end portion side in the width direction of the portion fixed by the fixture. Thus, the rigidity in the vicinity of the fixed part can be increased.
Further, according to the seat back frame of the present invention, the front frame piece and the rear frame piece overlap in the width direction inside the seat width direction of the portion where the armrest mounting portion in the portion constituting the side frame is formed. By being joined, the rigidity in the vicinity of the armrest mounting portion can be increased.

1 is a perspective view of a vehicle seat according to a first embodiment of the present invention. It is a perspective view showing a seat frame concerning a 1st embodiment. It is a perspective view which shows the rear frame piece and front frame piece which concern on 1st Embodiment. FIG. 4 is a cross-sectional view taken along the line IV-IV of the side frame shown in FIG. 2. FIG. 5 is a cross-sectional arrow view showing a VV cross section of the seat frame shown in FIG. 2. (A) is a schematic diagram which shows the front of a spring attachment part, (B) is a schematic diagram which shows the side surface of a spring attachment part. It is a figure which shows the side frame which concerns on 2nd Embodiment, and is a cross-sectional arrow view which shows the cross section corresponding to the VV cross section of FIG. It is a cross-sectional arrow view showing the VIII-VIII cross section of FIG. It is a figure which shows the side frame which concerns on 3rd Embodiment, and is a cross-sectional arrow view which shows the cross section corresponding to the VV cross section of FIG. It is a figure which shows the side frame which concerns on 4th Embodiment, and is a cross-sectional arrow view which shows the cross section of the reverse direction of the arrow direction in the VV cross section of FIG.

Hereinafter, a seat back frame according to an embodiment of the present invention (hereinafter, this embodiment) will be described.
Here, in the following description, the front-rear direction of the seat back frame is a front-rear direction based on the seated person in a state where the seated person is seated on the seat, and is simply referred to as the front-rear direction below. Further, the width direction of the seat back frame is a direction that coincides with the direction along the lateral width of the seat back frame, and is hereinafter simply referred to as the width direction or the seat width direction. Further, the vertical direction is the vertical direction of the seat back frame.
The directions and positions described in the following description are the directions and positions in the above state.

<< First Embodiment >>
A seat back frame 4 and a vehicle seat S including the seat back frame 4 according to a first embodiment (hereinafter, this embodiment) of the present invention will be described with reference to FIGS.

  Here, FIG. 1 is a perspective view of the vehicle seat S according to the first embodiment of the present invention, FIG. 2 is a perspective view showing the seat frame 3 according to the first embodiment, and FIG. FIG. 4 is a perspective view showing a rear frame piece 40 and a front frame piece 41 according to the embodiment, FIG. 4 is a cross-sectional view showing an IV-IV cross section of the side frame 4s shown in FIG. 2, and FIG. FIG. 6A is a schematic view showing the front of the spring mounting portion 43, and FIG. 6B is a side view of the spring mounting portion 43. It is a schematic diagram shown.

  As shown in FIG. 1, the vehicle seat S includes a seat cushion 1 that supports an occupant's buttocks and a seat back 2 on which the occupant leans. Each of the seat cushion 1 and the seat back 2 is configured such that a cushion pad 1a is disposed on a cushion frame 5, a cushion pad 2a is disposed on a seat back frame 4, and further covered with skin materials 1b and 2b.

  As shown in FIG. 2, the seat frame 3 of the vehicle seat S according to the present embodiment includes a seat back frame 4 constituting the seat back 2 and a cushion frame 5 constituting the seat cushion 1. The seat back frame 4 and the cushion frame 5 are made of carbon fiber reinforced plastic (hereinafter referred to as CFRP) as a resin material, and each component is integrally formed by molding.

  The material of the seat back frame 4 and the cushion frame 5 is not limited to CFRP, and may be formed of other resin materials other than CFRP, for example, plastic with glass fiber or plastic without carbon fiber. Good. The molding method of the seat back frame 4 and the cushion frame 5 is not limited to the case where CFRP is introduced into the mold and integrally molded, and a method other than mold molding, for example, a sheet made of a resin material is framed. It is good also as shape | molding the seat back frame 4 and the cushion frame 5 by laminating | stacking according to a shape.

  As shown in FIG. 3, the seat back frame 4 is joined to the rear frame piece 40 formed in a substantially rectangular shape in front view and the front side of the rear frame piece 40, and has a substantially inverted U shape in front view. There is a front frame piece 41 that is spaced apart in the seat width direction on the lower side. The front frame piece 41 and the rear frame piece 40 are combined in the front-rear direction, and the shapes of the respective parts are formed so as to correspond to the outer shapes.

The rear frame piece 40 includes a rear side frame portion 40s extending up and down on the left and right in the seat width direction, and a spring mounting portion 43 (described later) projecting inwardly in the seat width direction from the rear side frame portion 40s. With.
The rear side frame portion 40 s is joined to a front side frame portion 41 s of a front frame piece 41 to be described later to constitute a side frame 4 s of the seat back frame 4. Specifically, as shown in FIG. 4, the rear side frame portion 40s includes a rear surface portion 40a, an inner portion 40b as the other end portion according to the present invention, and an outer portion 40c as one end portion according to the present invention. The outer portion 40c is joined to an outer portion 41c of a front frame piece 41 to be described later.

  Further, as shown in FIG. 2, a wire spring 42, which is an S spring as an elastic member according to the present invention, is attached to the rear frame piece 40. A pair of wire springs 42 are provided on the top and bottom, and both ends are attached to the spring attachment portion 43.

The spring mounting portions 43 as the elastic member mounting portions according to the present invention are formed in two pairs at the top and bottom and two at the left and right in the seat width direction of the rear frame piece 40 so that the two wire springs 42 can be mounted. . Specifically, as shown in FIGS. 2 and 6, the spring mounting portion 43 is formed to protrude inward from the left and right rear side frame portions 40 s and straddles the corner portion on the protruding portion side. And has a through hole 43a extending to the slope. The end portion of the wire spring 42 is passed through the through hole 43 a, and the wire spring 42 is attached to the rear frame piece 40.
In addition, the through hole 43a is formed across the highly rigid corner portion of the spring mounting portion 43, thereby suppressing the overall rigidity of the spring mounting portion 43 from being reduced.

  Thus, by forming the spring mounting portion 43 on the rear frame piece 40, the amount of rearward deflection of the seated person can be increased compared to the case where it is formed on the front frame piece 41. And cushioning for the seated person can be improved. In addition, since the spring mounting portion 43 is formed so as to protrude inwardly from the left and right rear side frame portions 40s, the rigidity of the spring mounting portion 43 is increased as compared with those not protruding and further formed, The wire spring 42 can be disposed compactly in the sheet width direction.

The front frame piece 41 includes a front side frame portion 41s extending upward on the left and right sides in the seat width direction, and is formed in a substantially inverted U shape in a front view.
As shown in FIG. 4, the front side frame portion 41s includes a front surface portion 41a, an inner portion 41b as the other end portion according to the present invention, and an outer portion 41c as one end portion according to the present invention. It is formed in a letter shape. The front side frame portion 41 s is a portion where the outer side surface of the outer side portion 41 c is overlapped with the inner side surface of the outer side portion 40 c of the rear frame piece 40 in the thickness direction, and the adhesive 47 shown in FIG. It is joined to the rear side frame portion 40s by a rivet 44 or the like as a tool.
In the state where the rear frame piece 40 and the front frame piece 41 are overlapped in the front-rear direction, the inner portion 40b of the rear frame piece 40 and the inner portion 41b of the front frame piece 41 are mostly in the width direction. They are arranged so as to form a gap 46 in the front-rear direction apart from each other without overlapping.

As described above, the side frame 4s is configured to be joined only at a portion where the outer portion 40c of the rear frame piece 40 and the outer portion 41c of the front frame piece 41 overlap with each other, so that a closed cross section is formed. Compared with the one that is overlapped and joined in two places, there are few overlapping parts and there are few joining parts. For this reason, the joining operation | work which joins the rear side frame piece 40 and the front side frame piece 41 becomes easy, and the efficiency of the assembly operation | work of the seat back frame 4 can be improved.
Further, since the gap 46 is formed on the inner side in the seat width direction, the cushion material is allowed to enter the gap 46, and a seated person who sits on the inner side in the seat width direction is accepted by the movement amount of the cushion material. By becoming easy, it can suppress making a seated person feel uncomfortable. On the other hand, since the gap 46 is not formed on the outer side of the side frame 4s in the seat width direction, it is easy to attach external devices such as an airbag case 6 and an armrest 7 described later.

As shown in FIG. 5, an opening 45 is formed in the outer portion 40 c of the rear frame piece 40. The opening 45 is formed in the vicinity of a portion where the outer portion 40 c of the rear frame piece 40 and the outer portion 41 c of the front frame piece 41 overlap. A part of the portion where the outer portion 40c of the rear frame piece 40 and the outer portion 41c of the front frame piece 41 overlap is exposed from the inner portion 41b of the front frame piece 41 in FIG.
By forming the opening 45 in this way, an operator who assembles the seat back frame 4 confirms the coupling state of the outer portion 40c and the outer portion 41c, for example, the application state of the adhesive 47, through the opening 45. can do.
Furthermore, an opening 45 may be formed in the vicinity of the spring mounting portion 43. In this way, the operator can check the attachment state of the wire spring 42 to the spring attachment portion 43 through the opening 45.

  As described above, the seat back frame 4 according to the first embodiment includes an overlapping portion in the seat width direction between the rear side frame portion 40s of the rear frame piece 40 and the front side frame portion 41s of the front frame piece 41. However, it is only between the outer part 40c and the outer part 41c. For this reason, if only these portions are joined, the side frame 4s can be formed, and the assembly can be efficiently performed as compared with the case where the entire side frame 4s is formed in a closed cross-sectional shape.

<< Second Embodiment >>
Next, the side frame 8s according to the second embodiment will be described with reference to FIGS.
FIG. 7 is a view showing the side frame 8s according to the second embodiment, and is a cross-sectional view showing a cross section corresponding to the VV cross section of FIG. 2, and FIG. 8 is a cross section taken along the line VIII-VIII of FIG. FIG.

  The side frame 8s according to the second embodiment is related to the first embodiment in that a gap 46 is formed between the inner portion 40b of the rear frame piece 40 and the inner portion 41b of the front frame piece 41. Although it is not different from the side frame 4s, it is different in that a part thereof is overlapped and joined so as to form a closed cross section at a predetermined location.

Specifically, the front frame piece 41 includes an extension part 41e that extends toward a part of the inner side part 41b toward the inner side part 40b of the rear side frame piece 40. In the place where the extension part 41e is formed, the side frame 8s has a closed cross section, and the rigidity is increased.
The extending portion 41 e is formed between the upper and lower spring mounting portions 43 so as to avoid the vicinity of the spring mounting portion 43. By forming the extending portion 41e in this manner, the rigidity around the spring mounting portion 43 can be improved, and the spring mounting portion 43 as a whole is difficult to improve in terms of structure. The rigidity of can be improved.

<< Third Embodiment >>
Next, a side frame 9s according to a third embodiment will be described with reference to FIG. FIG. 9 is a view showing a side frame 9s according to the third embodiment, and is a cross-sectional arrow view showing a cross section corresponding to the VV cross section of FIG.

An airbag case 6 that houses an airbag (not shown) is attached to the outer surface of the side frame 9s according to the third embodiment. And the side frame 9s is formed in the same closed cross section as what was shown in FIG. 8 in the position which opposes the two fasteners 6a which fasten the airbag case 6 to the side frame 9s.
Specifically, two extending portions 41f extending toward the rear frame piece 40 are formed at positions facing the two fasteners 6a in the inner portion 41b of the front frame piece 41, Similarly to the extending portion 41e according to the second embodiment shown in FIG. 8, the inner portion 40b of the rear frame piece 40 and the inner portion 41b of the front frame piece 41 are overlapped and joined.

  As described above, the rigidity of the side frame 9 s of the airbag case 6 that faces the fastener 6 a is closed to increase the rigidity, thereby preventing the fastening position of the airbag case 6 from shifting.

<< Fourth Embodiment >>
Next, a side frame 10s according to a fourth embodiment will be described with reference to FIG. FIG. 10 is a view showing a side frame 10s according to the fourth embodiment, and is a cross-sectional arrow view showing a cross section in a direction opposite to the arrow direction in the VV cross section of FIG.

The armrest 7 is attached to the outer surface of the side frame 10s according to the fourth embodiment via a bracket 7a as an armrest attachment portion of the present invention. The bracket 7a is a mounting part for rotatably supporting the rotation shaft 7b of the armrest 7.
The side frame 10s is configured so that the side frame 10s forms a closed cross section at a position facing the bracket 7a.
Specifically, an extending portion 41g extending toward the rear frame piece 40 is formed at a position facing the bracket 7a in the inner portion 41b of the front frame piece 41 in the side frame 10s. Similarly to the extending portion 41e according to the second embodiment shown, the inner portion 40b of the rear frame piece 40 and the inner portion 41b of the front frame piece 41 are overlapped and joined.

  In the part where the extending part 41g is formed, the side frame 9s has a closed cross section. Further, since the load from the armrest 7 is applied to the side frame 10s through the bracket 7a, the side frame 9s of the portion facing the bracket 7a is closed and the rigidity is increased, so that the armrest 7 is stably supported. Is possible.

  The above embodiment is merely an example for facilitating understanding of the present invention, and does not limit the present invention. That is, the manufacturing process of the seat back manufacturing method, such as the shape, dimensions, and arrangement of each part of the seat back frame according to the above-described embodiment, can be changed and improved without departing from the gist of the present invention. Of course, the equivalent is included.

  For example, in the above embodiment, the gap formed between the front frame piece and the rear frame piece constituting the side frame has been described as being on the inner side in the seat width direction, but is formed on the outer side in the seat width direction. You may do it. Even if it does in this way, the part which a front side frame piece and a back side frame piece overlap in the width direction can be reduced, and since the site | part joined by an adhesive agent or a fixture decreases, assembly efficiency can be improved.

  Further, the side frame may have a closed cross section corresponding to a fixing position by a rivet or the like that fixes the front frame piece and the rear frame piece. In this way, the coupling between the front frame piece and the rear frame piece can be further strengthened.

  Moreover, in the said embodiment, although it demonstrated as a front frame piece being combined inside the rear frame piece in the side frame part, this inside / outside combination method may be reversed. For this reason, when the front frame piece is combined outside the rear frame piece, it is preferable that the opening for confirming both joints is formed in the front frame piece on the outside.

S Vehicle seat 1 Seat cushion 1a Cushion pad 1b Skin material 2 Seat back 2a Cushion pad 2b Skin material 3 Seat frame 4 Seat back frame 4s Side frame 40 Rear frame piece 40s Rear side frame portion 40a Rear surface portion 40b Inner portion ( The other end)
40c Outer part (one end)
41 Front frame piece 41s Front side frame part 41a Front part 41b Inner part (other end part)
41c Outer part (one end)
41d Fastener 41e, 41f, 41g Extension part 42 Wire spring (elastic member)
43 Spring mounting part (elastic member mounting part)
43a Through hole 44 Rivet (fixture)
45 Opening 46 Clearance 47 Adhesive 5 Cushion frame 6 Airbag case 6a Fastener 7 Armrest 7a Bracket (armrest mounting part)
7b Rotating shaft 8s, 9s, 10s Side frame

Claims (10)

A resin seat back frame composed of a front frame piece and a rear frame piece,
A side frame provided at an end portion in the width direction of the seat back frame is configured by combining a front side frame portion that the front frame piece has and a rear side frame portion that the rear frame piece has,
At the one end portion in the width direction of the side frame, the front side frame portion and the rear side frame portion overlap each other in the width direction and are joined to each other.
The front side frame portion and the rear side frame portion are separated from each other in the front-rear direction of the seat back frame to form a gap in at least a part of the other end portion in the width direction of the side frame. A seatback frame characterized by   The seat back frame according to claim 1, wherein the other end portion in the width direction is inside the seat back frame in the width direction.   At least one of the front frame piece and the rear frame piece is an outer portion in the width direction of the seat back frame, and the front side frame portion and the rear side frame portion overlap in the width direction. The seat back frame according to claim 1 or 2, wherein an opening that is open in the width direction is formed in the vicinity of the joined portion.   The elastic member attachment part which attaches the elastic member constructed in the said width direction of the said seat back frame is formed in the said back side frame piece, The Claim 1 characterized by the above-mentioned. Seat back frame.   The seat back frame according to claim 4, wherein the elastic member mounting portion projects from the rear frame piece to the inside in the width direction of the seat back frame. A plurality of the elastic member mounting portions are formed vertically,
The front side frame portion and the rear side frame portion are between the elastic member mounting portions arranged above and below, and are joined at the other end portion in the width direction of the side frame so as to overlap the width direction. The seat back frame according to claim 4 or 5, wherein the seat back frame is provided. The elastic member mounting portion has a convex shape that protrudes inward in the width direction of the seat back frame, and is formed so as to straddle a corner portion on the protruding portion side of the convex shape. Have
The seat back frame according to any one of claims 4 to 6, wherein the elastic member is inserted into the hole and latched. An airbag attachment portion to which an airbag case for storing an airbag is attached is formed on the outer side in the width direction of the seat back frame at a portion constituting the side frame of the front frame piece or the rear frame piece. And
The front side frame portion and the rear side frame portion are joined in the width direction on the inner side in the width direction of the seat back frame at a portion where the airbag attaching portion is formed. The seat back frame according to any one of claims 1 to 7.   The front side frame portion and the rear side frame portion are fixed by a fixture, and are joined in the width direction on the other end portion side in the width direction of the portion fixed by the fixture. The seat back frame according to any one of claims 1 to 8, wherein the seat back frame is provided. An armrest attaching portion to which a pivot shaft of an armrest is attached is formed on the outer side in the width direction of the seat back frame at a portion constituting the side frame of the front frame piece or the rear frame piece,
The front side frame portion and the rear side frame portion are joined to overlap each other in the width direction inside the width direction of a portion where the armrest mounting portion is formed. The seat back frame according to any one of 1 to 9.

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