JP2019073101A - Seat frame and vehicle seat - Google Patents

Abstract

To provide a seat frame which achieves a reduction in cost, and to provide a vehicle seat.SOLUTION: A seat frame F includes a cushion frame F1 and a back frame F2. The cushion frame F1 includes: a first rear side frame 10A ad a second rear side frame 10B spaced apart from each other in a lateral direction; and a first pipe frame 20 connecting front parts of the first rear side frame 10A and the second rear side frame 10B. The back frame F2 includes: a first lower side frame 50A connected to a rear part of the first rear side frame 10A; a second lower side frame 50B connected to a rear part of the second rear side frame 10B; and a second pipe frame 60 connecting upper parts of the first lower side frame 50A and the second lower side frame 50B. The first pipe frame 20 and the second pipe frame 60 have the same shape and are common parts.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a seat frame provided with a cushion frame and a back frame, and a vehicle seat provided with the seat frame.

  BACKGROUND Conventionally, a seat such as a car seat provided with a cushion frame that constitutes a frame of a seat cushion and a back frame that constitutes a frame of a seatback is known (see, for example, Patent Document 1).

JP 2008-013095 A

  By the way, cost reduction is desired for the sheet. Further, in order to reduce the cost of the seat, it is also desired to reduce the cost of various parts constituting the seat, and the seat frame is no exception.

Then, an object of this invention is to provide the seat frame which can aim at cost reduction, and the sheet | seat for vehicles.
Another object of the present invention is to make the hardness of the pad covering the cushion frame approximately constant.
Another object of the present invention is to position a pad covering a cushion frame and to suppress positional deviation.

  In order to achieve the above object, the seat frame of the present invention is a seat frame provided with a cushion frame constituting a frame of a seat cushion and a back frame constituting a frame of a seat back, and the cushion frame is The back frame includes a first side frame and a second side frame spaced apart in the left and right direction, and a first connecting frame connecting the front of the first side frame and the front of the second side frame, A third side frame connected to a rear portion of the first side frame, a fourth side frame disposed to be separated left and right with respect to the third side frame, and connected to a rear portion of the second side frame; A third side frame and a second connection frame connecting upper portions of the fourth side frames; , The second connection frame and the first connection frame have the same shape, characterized in that it is a shared component.

  According to such a configuration, the types of parts constituting the seat frame can be reduced, so that the cost of the seat frame can be reduced.

  In the seat frame described above, the first connection frame extends rearward from the left and right ends of the front frame extending left and right, and the rear is connected to the front of the first side frame and the second side frame. The second connection frame extends downward from the left and right ends of the upper frame, and the lower portion is the third side frame and the fourth side. The left and right upper side frames connected to the upper portion of the frame can be configured.

  According to this, the common parts can be enlarged, and most of the seat frame can be configured by the common parts. Thus, the cost of the seat frame can be further reduced.

  In the seat frame described above, each of the first connection frame and the second connection frame may be formed by bending a pipe material.

  According to this, the first connection frame having the front frame and the left and right front side frames, and the second connection frame having the upper frame and the left and right upper side frames can be easily and inexpensively manufactured, so the seat frame can be further enhanced. Cost reduction can be achieved.

  In the seat frame described above, the front frame and the upper frame each have a pair of recessed portions aligned in the left and right direction formed by crushing a part of the pipe material, and the second connection frame includes the pair of The bracket for attaching a headrest to a crevice may be attached, respectively, and the 1st connection frame can be considered as composition arranged so that a pair of crevices may turn below.

  According to this, since it is possible to share the first connection frame and the second connection frame in a state in which the pair of recessed portions are formed, it is possible to easily manage the parts and to further reduce the cost of the seat frame. Further, by arranging the concave portion of the first connection frame to face downward, it is possible to suppress a gap from being formed between the lower surface of the pad covering the cushion frame and the upper surface of the front frame. And the pad can have a substantially constant thickness. Thereby, the hardness of the pad can be made substantially constant.

  In the seat frame described above, the front frame and the upper frame each have a pair of recessed portions aligned in the left and right direction formed by crushing a part of the pipe material, and the second connection frame includes the pair of The bracket for attaching a headrest to a crevice may be attached, respectively, and the 1st connection frame can be considered as composition arranged so that a pair of crevices may turn up.

  According to this, since it is possible to share the first connection frame and the second connection frame in a state in which the pair of recessed portions are formed, it is possible to easily manage the parts and to further reduce the cost of the seat frame. In addition, since the pair of concave portions of the first connection frame are arranged to face upward, the pad covering the cushion frame is provided with a portion engaged with the pair of concave portions to position the pad or shift the position. Can be suppressed.

  The seat frame described above includes a support member disposed between the first side frame and the second side frame to support the seat occupant, and the support member is disposed at a position different from the recess in the lateral direction. It may be configured to be attached to the frame.

  According to this, for example, it is not necessary to form or process the portion attached to the front frame of the support member according to the shape of the portion in which the recess is formed, thereby further reducing the cost of the seat frame Can be

  In the seat frame described above, the support member may include a plurality of left and right wire members attached to the front frame, and the wire members may be attached to both left and right sides of the recess.

  In the seat frame described above, in the first connection frame and the second connection frame, the diameter of the pipe material forming the first connection frame and the diameter of the pipe material forming the second connection frame are equal to each other; The lengths of the frame and the upper frame may be equal to each other, and the lengths of the front side frame and the upper side frame may be equal to each other.

  In the seat frame described above, the lower portion of the back frame is pivotably connected to the rear of the cushion frame about a pivot axis extending in the left-right direction, and the distance from the pivot axis to the upper side frame is The distance from the pivot axis to the front side frame may be longer.

  In addition, in order to achieve the above-mentioned object, the vehicle seat of the present invention is characterized by including the above-mentioned seat frame and a pad covering the seat frame.

  According to such a configuration, the cost of the seat frame can be reduced, so that the cost of the vehicle seat provided with the seat frame can be reduced.

  According to the present invention, the cost of the seat frame can be reduced.

  Further, according to the present invention, the first connection frame includes the front frame and the left and right front side frames, and the second connection frame includes the upper frame and the left and right upper side frames, thereby further forming the seat frame. Cost reduction can be achieved.

  Further, according to the present invention, by forming the first connection frame and the second connection frame by bending the pipe members, the cost of the seat frame can be further reduced.

Further, according to the present invention, by forming the pair of recesses in the front frame and the upper frame, the cost of the seat frame can be further reduced.
Further, according to the present invention, the hardness of the pad covering the cushion frame can be made substantially constant by arranging the first connection frame so that the pair of concave portions face downward.

  Further, according to the present invention, by arranging the first connection frame so that the pair of concave portions face upward, it is possible to position the pad covering the cushion frame or to suppress positional deviation.

  Further, according to the present invention, the cost of the seat frame can be further reduced by attaching the support member to the front frame at a position different from the concave portion in the left-right direction.

  Further, according to the present invention, by providing the vehicle seat with the above-described seat frame, it is possible to reduce the cost of the vehicle seat.

1 is a perspective view of a vehicle seat as a vehicle seat. It is a perspective view of a seat frame concerning an embodiment. They are a perspective view (a) of a 1st pipe frame, and a perspective view (b) of a 2nd pipe frame. They are a top view (a) of the front part of a cushion frame, and a sectional view (b) which looked at a cushion frame and a cushion pad from the front. It is a side view of a seat frame. It is a perspective view of a seat frame concerning a modification. It is sectional drawing which looked at the cushion frame and cushion pad which concern on a modification from the front. It is a perspective view (a) of the seat frame concerning other modifications, and (b).

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the present specification, front, rear, left, right, upper and lower are based on front, rear, left, right, upper, lower as viewed from a person sitting on a seat (seated person).
As shown in FIG. 1, the vehicle seat of the present embodiment is configured as a vehicle seat S mounted on a vehicle, and includes a seat cushion S1, a seat back S2, and a headrest S3.

  The vehicle seat S includes a seat frame F (see FIG. 2), a pad P covering the seat frame F, and a skin material U. The pad P is made of urethane foam or the like, and includes a cushion pad P1 constituting a pad of the seat cushion S1 and a back pad P2 constituting a pad of the seat back S2. The skin material U is made of cloth, leather or the like, and includes a skin material U1 of the seat cushion S1 covering the cushion pad P1 and a skin material U2 of the seat back S2 covering the back pad P2.

  As shown in FIG. 2, the seat frame F includes a cushion frame F1 that configures a frame of the seat cushion S1 and a back frame F2 that configures a frame of the seat back S2.

The cushion frame F1 includes a first rear side frame 10A as a first side frame, a second rear side frame 10B as a second side frame, a first pipe frame 20 as a first connection frame, and a rear frame 30. .
The first rear side frame 10A and the second rear side frame 10B are disposed apart from each other in the left and right direction. Each of the first rear side frame 10A and the second rear side frame 10B has a main body frame 11 and a connecting frame 12. The main body frame 11 is made of sheet metal and is formed in a long shape long back and forth. Further, the connecting frame 12 is connected to the rear of the main body frame 11 by welding, bolt fastening or the like, and forms a connecting portion 12A extending upward from the rear of the main body frame 11. A back frame F2 is connected to the connecting portion 12A.

  The first pipe frame 20 is a frame that connects the front portions of the first rear side frame 10A and the second rear side frame 10B, and is formed by bending a metal pipe material into a U-shape. Specifically, the first pipe frame 20 has a front frame 21 extending in the left and right direction, and left and right front side frames 22 extending in the rear direction from the left and right ends of the front frame 21. In the present embodiment, the right front side frame 22 is connected at its rear portion to the front of the first rear side frame 10A by welding or the like, and together with the first rear side frame 10A, the right side frame of the cushion frame F1 (cushion side frame 10R ) Is configured. The left front side frame 22 has its rear portion connected to the front of the second rear side frame 10B by welding or the like, and constitutes the left side frame (cushion side frame 10L) of the cushion frame F1 together with the second rear side frame 10B. doing.

  As shown to Fig.3 (a), the front frame 21 has a pair of recessed part 21A, 21B located in a line with right and left. Recesses 21A and 21B are each formed by crushing a part of the pipe material constituting first pipe frame 20. The recesses 21A and 21B are formed such that the bottom portion of the recess is a flat surface. The concave portions 21A and 21B have substantially the same shape and size. As shown in FIG. 2, the first pipe frame 20 is disposed such that the pair of recessed portions 21A and 21B face downward (see also FIG. 4 (b)).

  The rear frame 30 is made of sheet metal and is formed in a long shape in the left and right. The rear frame 30 connects the rear portions of the first rear side frame 10A and the second rear side frame 10B. Specifically, the rear frame 30 has its right end connected to the rear of the first rear side frame 10A by welding or the like, and has its left end connected to the rear of the second rear side frame 10B by welding or the like. On the upper surface of the rear frame 30, three spring hooks 35 are disposed side by side and spaced apart in the left-right direction by cutting and raising a part of the sheet metal that constitutes the rear frame 30.

  A support member 40 is disposed between the first rear side frame 10A and the second rear side frame 10B of the cushion frame F1, more specifically, between the left and right cushion side frames 10L and 10R. The supporting member 40 is a member for supporting a seated person sitting on the vehicle seat S from below, and is a connecting member 42 for connecting the three S springs 41 as a plurality of wire members arranged in the right and left and the three S springs 41. And. The S spring 41 is an elastically deformable spring that extends back and forth while bending alternately to the left and right, and is provided so as to bridge the front frame 21 and the rear frame 30. In more detail, the S-spring 41 has a hooking portion 41H at the front end, in which the wire forming the S-spring 41 is bent in a substantially arc shape and covered with resin. The S-spring 41 is attached to the front frame 21 by the hooking portion 41H (front end) being hooked to the front frame 21, and the rear end is hooked to the spring hooking portion 35 of the rear frame 30. Is attached to the rear frame 30. The connecting member 42 is made of resin, and is integrally formed with the S spring 41 in a state of covering the entire circumference of a part of the S spring 41 by insert molding or the like.

  As shown to Fig.4 (a), S spring 41 which comprises the supporting member 40 is attached to the front frame 21 in the position different from recessed part 21A, 21B in the left-right direction. Specifically, the right S spring 41A is attached to the front frame 21 outside (right side) in the left / right direction than the right recess 21A, and the left S spring 41B is outside (left) in the left direction than the left recess 21B. ) Is attached to the front frame 21. The middle S spring 41C is attached to the front frame 21 between the left and right recesses 21A and 21B. In other words, the S springs 41A and 41C are attached to the left and right sides of the recess 21A so as to sandwich the recess 21A in the left and right direction, and the S springs 41B and 41C are on the left and right sides of the recess 21B so as to sandwich the recess 21B in the left and right direction. It is attached.

As shown in FIG. 2, the back frame F2 includes a first lower side frame 50A as a third side frame, a second lower side frame 50B as a fourth side frame, and a second pipe frame as a second connection frame. 60 and the lower frame 70.
The first lower side frame 50 </ b> A and the second lower side frame 50 </ b> B are made of sheet metal and formed in a long shape which is long in the upper and lower directions. The first lower side frame 50A and the second lower side frame 50B are disposed apart from each other in the left and right direction. In other words, the second lower side frame 50B is disposed apart from the first lower side frame 50A in the lateral direction.

  The second pipe frame 60 is a frame connecting the upper portions of the first lower side frame 50A and the second lower side frame 50B, and is formed by bending a metal pipe material into a U-shape. Specifically, the second pipe frame 60 has an upper frame 61 extending in the left and right direction, and left and right upper side frames 62 extending downward from the left and right ends of the upper frame 61. In the present embodiment, the lower part of the right upper side frame 62 is connected to the upper part of the first lower side frame 50A by welding or the like, and the right side frame of the back frame F2 (back side frame) together with the first lower side frame 50A 50R). The lower part of the left upper side frame 62 is connected to the upper part of the second lower side frame 50B by welding or the like, and the left side frame (back side frame 50L) of the back frame F2 is combined with the second lower side frame 50B. Configured.

  The upper frame 61 has a pair of recessed portions 61A and 61B aligned in the left and right direction. Recesses 61A and 61B are each formed by crushing a part of the pipe material constituting second pipe frame 60. The recesses 61A and 61B are formed such that the bottom portion of the recess is a flat surface. The concave portions 61A and 61B have substantially the same shape and size. The second pipe frame 60 is disposed such that the pair of concave portions 61A and 61B face the front. The second pipe frame 60 has brackets 80 attached to the flat bottom portions of the pair of recesses 61A and 61B by welding or the like. The bracket 80 is a cylindrical member for inserting and attaching a pillar (not shown) of the headrest S3.

  The lower frame 70 is a frame that connects the lower portions of the first lower side frame 50A and the second lower side frame 50B, and is formed in a long elongated shape in the left and right. The lower frame 70 has its right end connected to the lower part of the first lower side frame 50A by welding or the like, and has its left end connected to the lower part of the second lower side frame 50B by welding or the like.

  The lower portion of the back frame F2 is rotatably coupled to the rear of the cushion frame F1 about a pivot axis A1 extending in the left-right direction. Specifically, in the back frame F2, the lower portion of the first lower side frame 50A is rotatably coupled to the connecting portion 12A provided at the rear of the first rear side frame 10A, and the lower portion of the second lower side frame 50B is the second It is rotatably coupled to a coupling portion 12A provided at the rear of the rear side frame 10B. As shown in FIG. 5, the distance D2 from the pivot axis A1 to the lower end of the upper side frame 62 connected to the upper portion of the lower side frames 50A, 50B is from the pivot axis A1 to the front of the rear side frames 10A, 10B. It is longer than the distance D1 to the rear end of the connected front side frame 22.

As shown in FIGS. 3A and 3B, in the vehicle seat S of the present embodiment, the first pipe frame 20 and the second pipe frame 60 have the same shape and are common components. Therefore, even if the first pipe frame 20 and the second pipe frame 60 are replaced with each other, the seat frame F can be configured.
Specifically, in the first pipe frame 20 and the second pipe frame 60, the diameter D20 of the pipe material forming the first pipe frame 20 and the diameter D60 of the pipe material forming the second pipe frame 60 are equal to each other. .

  The first pipe frame 20 and the second pipe frame 60 are formed in the same shape. Therefore, in the first pipe frame 20 and the second pipe frame 60, the length L21 of the front frame 21 and the length L61 of the upper frame 61 are equal to each other. Further, in the first pipe frame 20 and the second pipe frame 60, the length L22 of the left and right front side frames 22 and the length L62 of the left and right upper side frames 62 are equal to each other.

  The first pipe frame 20 and the second pipe frame 60 have the same shape and position of the recess 21A formed in the front frame 21 and the shape and position of the recess 61A formed in the upper frame 61. The first pipe frame 20 and the second pipe frame 60 have the same shape and position of the recess 21 B formed in the front frame 21 and the shape and position of the recess 61 B formed in the upper frame 61.

  In the present invention, the same diameter and the same length, the same position, is not limited to the case where the respective diameter, length, and the position completely match, and each diameter, the length, the position Also within the range of dimensional error that occurs in manufacturing.

  According to the embodiment described above, since the first pipe frame 20 and the second pipe frame 60 are shared parts, the types of parts constituting the seat frame F can be reduced. As a result, for example, costs for storage and management of parts can be reduced, so that the cost of the seat frame F can be reduced. Further, since the cost of the seat frame F can be reduced, the cost of the vehicle seat S provided with the seat frame F can be reduced.

  Also, since the first pipe frame 20 has the front frame 21 and the left and right front side frames 22 and the second pipe frame 60 has the upper frame 61 and the left and right upper side frames 62, for example, the first connecting frame is Compared with the case where it consists only of the front frame extended to and the 2nd connection frame consists only of the upper frame extended to right and left, shared parts can be enlarged. Thus, most of the seat frame F can be configured by the common parts (pipe frames 20, 60), so that the cost of the seat frame F and the vehicle seat S can be further reduced.

  Also, since the pipe frames 20 and 60 are each formed by bending the pipe material into a U shape, for example, the sheet metal is processed into a U shape, or a plurality of frames are joined to form a U shape. The first pipe frame 20 having the front frame 21 and the left and right front side frames 22 and the second pipe frame 60 having the upper frame 61 and the left and right upper side frames 62 can be easily and inexpensively compared to the case where It can be manufactured. As a result, the cost of the seat frame F and the vehicle seat S can be further reduced.

  Further, since the upper frame 61 has a pair of recessed portions 61A, 61B and the front frame 21 also has a pair of recessed portions 21A, 21B, the pipe frames 20, 60 are shared while forming the recessed portions 21A, 21B, 61A, 61B. Can be As a result, management of parts becomes easy, and therefore, the cost of the seat frame F and the vehicle seat S can be further reduced.

  Further, as shown in FIG. 4B, the concave portions 21A and 21B of the first pipe frame 20 are arranged to face downward, so the lower surface of the cushion pad P1 covering the cushion frame F1 and the front frame The cushion pad P1 can be made to have a substantially constant thickness while suppressing the formation of a gap between the upper surface of the cushion 21 and the upper surface of the cushion 21. Thereby, the hardness of the cushion pad P1 can be made substantially constant.

  Further, as shown in FIG. 4A, since the support member 40 is attached to the front frame 21 at a position different from the recesses 21A and 21B, for example, the portion attached to the front frame 21 of the support member is the recess 21A, It is not necessary to form or process according to the shape of the portion where 21 B is formed. As a result, the cost of the seat frame F and the vehicle seat S can be further reduced.

  As mentioned above, although embodiment of invention was described, this invention is not limited to the said embodiment. About a specific structure, it can change suitably in the range which does not deviate from the meaning of invention as follows.

  For example, in the embodiment described above, the first pipe frame 20 is disposed so that the pair of concave portions 21A and 21B face downward as shown in FIG. 2, but the present invention is not limited to this. Thus, the pair of recesses 21A and 21B may be arranged to face upward. As shown in FIG. 7, when the first pipe frame 20 is arranged such that the pair of recesses 21A and 21B face upward, the lower surface of the cushion pad P1 engages with the pair of recesses 21A and 21B. By providing the convex portions P11 and P12, it is possible to position the cushion pad P1 with respect to the first pipe frame 20 (the cushion frame F1) and to suppress positional deviation of the cushion pad P1.

  In the above embodiment, the upper frame 61 of the second pipe frame 60 is formed with the pair of recesses 61A, 61B, and the front frame 21 of the first pipe frame 20 is formed with the pair of recesses 21A, 21B. Not limited to this. For example, the configuration may be such that no recess is formed in both the first pipe frame and the second pipe frame.

  Moreover, in the said embodiment, although the pipe frame 20,60 was formed in U shape, it is not limited to this. For example, as shown in FIG. 8A, the first pipe frame 20 has a shape that extends in an inclined manner so that the front portions 22A of the left and right front side frames 22 are positioned inward in the left-right direction. It is also good. Similarly, the second pipe frame 60 may be inclined and extended so that the upper portions 62A of the left and right upper side frames 62 are positioned on the inner side in the left-right direction. Further, as shown in FIG. 8B, the first pipe frame 20 may have a shape that extends in an inclined manner so that the front portions 22B of the left and right front side frames 22 are positioned forward with respect to the front. . Similarly, the second pipe frame 60 may be shaped so as to be inclined so that the upper portions 62B of the left and right upper side frames 62 are positioned upward with respect to the rear.

  Moreover, in the said embodiment, although the 1st pipe frame 20 (1st connection frame) and the 2nd pipe frame 60 (2nd connection frame) were the flame | frame which bent and formed the pipe material, it is not limited to this. For example, the first connection frame and the second connection frame may not be a frame made of a pipe material but a plate-like frame made of a sheet metal or the like. Also, the first connection frame and the second connection frame may be, for example, a frame formed by connecting a pipe-shaped frame and a plate-like frame.

  Further, in the embodiment shown in FIG. 8 and the embodiment shown in FIG. 8, the first pipe frame 20 (first connection frame) and the second pipe frame 60 (second connection frame) formed in a substantially U shape are illustrated. It is not limited to this. For example, the first connection frame may be a pipe-like or plate-like frame extending in the left and right direction connecting front portions of the left and right side frames of the cushion frame. Similarly, the second connection frame may be a pipe-like or plate-like frame extending in the left and right direction connecting upper portions of left and right side frames of the back frame.

  Moreover, although the S spring 41 was illustrated as a wire member in the said embodiment, it is not limited to this. For example, the wire member may be a wire bridged between the front frame and the rear frame of the cushion frame, which has fewer bending portions than the S spring 41.

  Moreover, in the said embodiment, although the supporting member 40 containing the S spring 41 (wire member) and the connection member 42 was illustrated as a supporting member, it is not limited to this. For example, the support member may be configured of a plurality of unconnected S springs. That is, the support member may not have the connecting member 42 in the embodiment. In addition, the support member is, for example, a plate-like member including a plurality of wire members bridged over the cushion frame, and a connection member made of resin and connecting the wire members in a state of covering substantially all of the plurality of wire members. It may be a support member of

  Further, in the embodiment, the first rear side frame 10A (first side frame) includes the main body frame 11 to which the first pipe frame 20 (first connecting frame) is connected and the connecting frame 12 to which the back frame F2 is connected. Although it was the structure which has as another part, it is not limited to this. For example, the first side frame may be configured as a single component integrally including a portion to which the first connection frame is connected and a portion to which the back frame is connected. The same applies to the second side frame.

  Moreover, in the said embodiment, although the vehicle seat S mounted in the motor vehicle was illustrated as a vehicle seat, it is not limited to this, The seat mounted in vehicles other than a car, for example, rail cars, ships, aircraft etc. It may be Moreover, in the said embodiment, although the vehicle seat, such as vehicle seat S, was illustrated as a seat provided with the seat frame of this invention, it is not limited to this, For example, it is used for vehicles used in an office, a home, etc. It may be a sheet other than the sheet.

  In addition, each element described in the above-described embodiment and modification may be implemented in any combination.

10A first rear side frame 10B second rear side frame 20 first pipe frame 20
21 Front Frame 21A Recess 21B Recess 22 Front Side Frame 40 Support Member 41 S Spring 50A First Lower Side Frame 50B Second Lower Side Frame 60 Second Pipe Frame 61 Upper Frame 62 Upper Side Frame 61A Recess 61B Recess 61 B Recess 80 Bracket A1 Rotation Axis F Seat frame F1 Cushion frame F2 Back frame P pad S Vehicle seat S1 Seat cushion S2 Seat back S3 Headrest

Claims (10)

A seat frame comprising a cushion frame constituting a frame of a seat cushion and a back frame constituting a frame of a seat back,
The cushion frame includes a first side frame and a second side frame which are disposed to be separated left and right, and a first connecting frame which connects the first side frame and the front of the second side frame.
The back frame includes a third side frame connected to the rear of the first side frame, and a left and right spaced apart side with respect to the third side frame, and a fourth side connected to the rear of the second side frame A side frame, and a second connection frame connecting the third side frame and an upper portion of the fourth side frame;
A seat frame characterized in that the first connection frame and the second connection frame have the same shape and are common parts. The first connecting frame is a front frame extending in the left and right direction, and the left and right front sides extending rearward from the left and right ends of the front frame, the rear being connected to the front of the first side frame and the second side frame Have a frame and
The second connection frame includes an upper frame extending in the left and right direction, and a lower side extending from the left and right ends of the upper frame, the lower side being connected to the upper side of the third side frame and the upper side of the fourth side frame. The seat frame according to claim 1, characterized in that:   The seat frame according to claim 2, wherein each of the first connection frame and the second connection frame is formed by bending a pipe material. Each of the front frame and the upper frame has a pair of recessed portions aligned in the left and right direction formed by crushing a part of the pipe material,
The second connection frame has brackets attached to the pair of recesses for attaching a headrest, respectively.
The seat frame according to claim 3, wherein the first connection frame is disposed such that the pair of concave portions face downward. Each of the front frame and the upper frame has a pair of recessed portions aligned in the left and right direction formed by crushing a part of the pipe material,
The second connection frame has brackets attached to the pair of recesses for attaching a headrest, respectively.
The seat frame according to claim 3, wherein the first connection frame is arranged such that the pair of concave portions face upward. A support member disposed between the first side frame and the second side frame to support a seat occupant;
The seat frame according to claim 4 or 5, wherein the support member is attached to the front frame at a position different from the concave portion in the left-right direction. The support member includes a plurality of side by side wire members attached to a front frame,
The seat frame according to claim 6, wherein the wire member is attached to both left and right sides of the recess.   In the first connection frame and the second connection frame, the diameter of the pipe forming the first connection frame is equal to the diameter of the pipe forming the second connection frame, and the length of the front frame and the upper The seat frame according to any one of claims 3 to 7, wherein the lengths of the frames are equal to each other, and the lengths of the front side frames and the upper side frames are equal to each other. The lower portion of the back frame is pivotally connected to the rear of the cushion frame about a pivot axis extending in the left-right direction,
The seat according to any one of claims 2 to 8, wherein a distance from the pivot axis to the upper side frame is longer than a distance from the pivot axis to the front side frame. flame. The seat frame according to any one of claims 1 to 9,
And a pad covering the seat frame.

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