JP2018039459A - Seat back frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat back frame which can reduce discomfort during seating.SOLUTION: A main plate is disposed between a pair of side frames and an upper part of the main plate is fixed to the side frames. A connection part connects a sub plate with the side frame and a pressing surface of the sub plate presses a rear surface of the main plate. The pressing surface curves along a vertical direction while protruding toward the main plate, and the connection part allows the entire sub plate to move in at least one of the vertical direction and a fore and aft direction. As a result, a load from the sub plate to the main plate is inhibited from concentrating and a load from the main plate to a seating person is inhibited from concentrating. Thus, discomfort is reduced during seating.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seat back frame and relates to a seat back frame that can suppress a sense of discomfort when seated.

  The seat back frame of a vehicle seat mounted on an automobile, etc., supports the back of the upper body of the seated person with a support, and changes the amount of pushing the support to the seated person, so that the seated person's preference can be changed. A device that adjusts the supportability of a seated person by a support is known (Patent Document 1). The support body of patent document 1 fixes the lower end of the leaf | plate spring extended up and down, and slides an upper end up and down, thereby deflecting the leaf | plate spring and pushing out a plate-shaped support member to a seated person side. The supportability of the seated person by the support is adjusted by changing the amount of bending of the leaf spring.

Special table 2013-504463 gazette

  However, in the above conventional technique, the upper end of the leaf spring with the lower end fixed is slid up and down to bend the leaf spring. Therefore, the curvature of the leaf spring increases as the lower end and the upper end of the leaf spring approach each other. The load on the support member concentrates. As a result, the load from the support member to the seat occupant concentrates on a part in the vertical direction, and the seat occupant feels uncomfortable.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a seat back frame that can suppress a sense of incongruity when seated.

Means for Solving the Problems and Effects of the Invention

  In order to achieve this object, according to the seat back frame of the first aspect, the main plate is disposed between the pair of side frames disposed at a predetermined interval on the left and right, and at least the upper part of the main plate is the side frame. It is fixed against. The sub plate is connected to the side frame by the connecting portion, and the rear surface of the main plate is pressed by the pressing surface of the sub plate. Since the entire sub-plate is moved in at least one of the vertical direction and the front-rear direction by the connecting portion, the main plate is moved by the pressing surface without changing the shape of the pressing surface that curves convexly toward the main plate along the vertical direction. The pressing position and the amount to be pushed out can be adjusted. Thereby, it can suppress that the load from a subplate concentrates on the main plate resulting from adjustment of the press position of a main plate, and the amount of extrusion. As a result, it is possible to suppress the concentration of the load from the main plate to the seated person, and thus there is an effect that it is possible to suppress the uncomfortable feeling at the time of sitting.

  According to the seat back frame of the second aspect, the main plate that can be bent and deformed includes a pair of left and right rails that project from the left and right sides toward the rear from the position pressed by the sub plate and extend in the vertical direction. When the sub plate is slid in the vertical direction with respect to the main plate by the connecting portion, the horizontal displacement of the sub plate can be prevented by the rail. Although the main plate can be reinforced by the rail, the main plate is hardly bent up and down by the rail. However, since the rail is divided into a plurality of vertical directions by a plurality of cuts extending in the left-right direction, the amount of bending of the main plate can be secured by the cuts. Therefore, in addition to the effect of the first aspect, there is an effect that the displacement of the sub plate can be prevented while securing the amount of bending of the main plate reinforced by the rail.

  According to the seat back frame of claim 3, the main plate that can be bent and deformed includes a pair of side slits extending in the vertical direction on both the left and right sides of the position pressed by the sub plate, and a pair of side slits. An end slit that connects the upper ends or the lower ends of each other is formed. Thereby, it is possible to easily deform the portion surrounded by the side slit and the end slit by the sub-plate. By extruding the portion surrounded by the side slits and the end slits to the seat occupant side with the sub-plate, the area for applying the load from the main plate to the seat occupant can be increased. As a result, in addition to the effect of the first or second aspect, there is an effect that the degree of freedom in adjusting the supportability of the seated person by the main plate can be improved.

  According to the seat back frame of claim 4, the main plate includes a pair of side slits extending in the vertical direction outside the pair of rails and an end slit connecting the upper ends or the lower ends of the pair of side slits. And are formed. Thereby, it is possible to easily deform the portion surrounded by the side slit and the end slit by the sub-plate. The area of the main plate that supports the seated person can be increased by pushing the portion surrounded by the side slit and the end slit to the seated person side with the sub-plate. As a result, there is an effect that it is possible to improve the degree of freedom of adjusting the supportability of the seated person by the main plate.

  Since the side slit is located outside the pair of rails, when the sub plate is moved by the connecting portion, the sub plate can be reliably guided to the portion surrounded by the side slit and the end slit. As a result, in addition to the effect of the second aspect, adjustment workability of the seater's supportability by the main plate can be ensured.

  According to the seat back frame of claim 5, the pressing surface has a vertical curvature radius of 200 mm or more and 300 mm or less. When the radius of curvature of the pressing surface is smaller than 200 mm, the load from the sub plate to the main plate is concentrated, and the seated person may feel uncomfortable. When the curvature radius of the pressing surface is larger than 300 mm, the sub-plate approaches a flat shape. Since the back surface of the seated person is a curved surface, the load that the seated person receives from the sub-plate through the main plate may concentrate on a part in the vertical direction. Since the radius of curvature of the pressing surface is 200 mm or more and 300 mm or less, concentration of the load on the seated person can be suppressed, and in addition to the effect of any one of claims 1 to 4, there is an effect that the uncomfortable feeling at the time of sitting can be further suppressed. .

It is a perspective view of a seat frame in a 1st embodiment of the present invention. It is a rear view of a seat back frame. It is sectional drawing of the support body in the III-III line of FIG. It is a rear view of the seat back frame in 2nd Embodiment. It is sectional drawing of the support body in the VV line | wire of FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. First, a seat frame 1 according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view of a seat frame 1 according to the first embodiment of the present invention.

  As shown in FIG. 1, the seat frame 1 is a frame of a vehicle seat mounted on an automobile or the like. The seat frame 1 includes a seat cushion frame 3, a seat back frame 10 (hereinafter referred to as “frame 10”) disposed at a rear end of the seat cushion frame 3, a rear end of the seat cushion frame 3, and a lower end of the frame 10. And a reclining device 2 for connecting the two.

  The reclining device 2 is a device that adjusts the inclination angle of the frame 10 with respect to the seat cushion frame 3. The reclining device 2 changes the inclination angle of the frame 10 with respect to the seat cushion frame 3 when a seated person operates an operation element (not shown) such as a switch or a lever.

  The seat cushion frame 3 is a frame of a seat cushion on which an occupant sits among the vehicle seats, and is mainly composed of a steel material. A cushion pad (not shown) made of foamed synthetic resin such as elastic flexible polyurethane foam is supported by the seat cushion frame 3 and is covered with a cover (not shown) made of fabric, synthetic leather or leather. A seat cushion is formed.

  The seat cushion frame 3 includes a steel frame body 4 having a square frame shape in plan view and four steel springs 5 spanned around the frame body 4. The seat cushion frame 3 supports the periphery of the cushion pad from below by the frame body 4, and supports the center of the cushion pad from below by the spring 5.

  The frame 10 is a seat back frame that serves as a backrest of an occupant in a vehicle seat, and is mainly composed of a steel material. A back pad (not shown) made of foamed synthetic resin such as elastic flexible polyurethane foam is supported by the frame 10, and the back pad is covered with a cover (not shown) made of fabric, synthetic leather or leather. Thus, a seat back is formed.

  The frame 10 includes a pair of side frames 11 and 12 disposed at a predetermined interval on the left and right sides, an upper frame 13 connecting the upper portions of the pair of side frames 11 and 12, and lower portions of the pair of side frames 11 and 12. The lower frame 14 which connects between them, the steel spring 15 spanned between a pair of side frames 11 and 12, and the support body 20 arrange | positioned between a pair of side frames 11 and 12 are provided.

  The side frames 11 and 12 are steel plates that are long in the vertical direction. The upper frame 13 is a U-shaped steel pipe, and both ends are welded to the upper ends of the side frames 11 and 12. The lower frame 14 is a steel plate that is long in the left-right direction, and both ends are welded to the lower ends of the side frames 11, 12.

  Next, the support 20 will be described with reference to FIGS. 2 and 3 in addition to FIG. 2 is a rear view of the frame 10, and FIG. 3 is a cross-sectional view of the support 20 taken along line III-III in FIG. In FIG. 3, the illustration of the upper hooking portion 21 a of the main plate 21 is omitted.

  As shown in FIGS. 1 and 2, the support 20 is a device that supports the back surface of the seated person, particularly the waist and pelvis. The support 20 includes a main plate 21 disposed between the side frames 11 and 12, a sub plate 22 that presses the main plate 21 toward the seated person, and a connecting portion 23 that connects the side frames 11, 12 and the sub plate 22. With.

  The connecting portion 23 includes a wire 24 to which the sub plate 22 is attached and a moving portion 25 that rotates the wire 24. The wire 24 is a member formed by bending a steel round bar. As for the wire 24, the 1st end 24a is supported by the moving part 25, and the 2nd end 24b is supported by the side frame 12 so that rotation is possible. The sub-plate 22 is attached to the eccentric portion 24 c that is a central portion in the left-right direction of the wire 24.

  The main plate 21 is a plate made of synthetic resin that can be bent and deformed. The main plate 21 is disposed with its front face facing a seated person and its front face in contact with the back face of a back pad (not shown). The main plate 21 is provided with two upper hook portions 21a at the upper edge. The upper hook portion 21 a is a portion that is hooked by the spring 15. Thereby, the main plate 21 is fixed to the side frames 11 and 12 via the spring 15.

  The main plate 21 is set to have sufficiently large vertical and horizontal dimensions with respect to the sub plate 22. Thereby, the main plate 21 can widely support a back pad (not shown) and a seated person. On the other hand, when the support 20 does not have the main plate 21, the back pad and the seated person are supported by the sub plate 22 and the spring 15, but when the sub plate 22 is projected to the front, the sub plate 22 is supported. A gap is formed between the spring 15 and the spring 15, and the seated person feels uncomfortable. In the present embodiment, since the support 20 has the main plate 21, it is possible to suppress a sense of incongruity when sitting compared to the case where the support 20 does not have the main plate 21.

  The sub plate 22 is a synthetic resin plate material. The surface of the sub plate 22 on the main plate 21 side is a pressing surface 22a. The sub-plate 22 includes an attachment portion 22b to which the wire 24 is attached on the surface opposite to the pressing surface 22a.

  As shown in FIG. 3, the pressing surface 22 a is a surface that presses the rear surface of the main plate 21, and is curved convexly toward the main plate 21 along the vertical direction. The pressing surface 22a is curved so as to continue smoothly in the vertical direction. Thereby, the main plate 21 pressed by the sub-plate 22 can be bent and deformed so as to continue smoothly in the vertical direction. As a result, it is possible to suppress the concentration of the load from the main plate 21 to the seated person, and to suppress a sense of discomfort during sitting.

  The pressing surface 22a preferably has a constant curvature radius in the vertical direction. Thereby, it can suppress more that the load from the subplate 22 to the main plate 21 concentrates, and since it can suppress more that the load from the main plate 21 to a seated person concentrates, the discomfort at the time of seating can be suppressed more.

  The pressing surface 22a preferably has a radius of curvature of 200 mm or more and 300 mm or less. When the radius of curvature of the pressing surface 22a is smaller than 200 mm, the load from the sub plate 22 to the main plate 21 is concentrated, and the seated person may feel uncomfortable. When the curvature radius of the pressing surface 22a is larger than 300 mm, the sub-plate 22 approaches a flat shape. Since the back surface of the seated person is a curved surface, the load that the seated person receives from the sub-plate 22 through the main plate 21 may concentrate on a part in the vertical direction. In this Embodiment, since the curvature radius of the press surface 22a is 200 mm or more and 300 mm or less, the concentration of the load to a seated person can be suppressed and there exists an effect which can suppress the discomfort at the time of seating more.

  The sub plate 22 is preferably more rigid than the main plate 21. In this case, when the main plate 21 is pressed by the sub plate 22, the sub plate 22 can be hardly deformed. Thereby, the main plate 21 can be bent using the original shape of the pressing surface 22a. As a result, it is possible to prevent the sub plate 22 from being bent and deformed to suppress the concentration of the load from the sub plate 22 to the main plate 21, and to suppress the concentration of the load from the main plate 21 to the seated person. A sense of incongruity can be suppressed.

  In the wire 24, the axis of the first end 24a is slightly eccentric with respect to the axis C of the second end 24b (see FIG. 1), and the axis of the eccentric portion 24c is greatly eccentric with respect to the axis C. The wire 24 has a second end 24b, a first end 24a, and an eccentric portion 24c arranged in a straight line in that order when viewed from the axial direction of the axis C.

  The moving unit 25 is a device that moves the sub-plate 22 in the vertical direction and the front-rear direction. The moving unit 25 includes a holding member 26, a long hole 27 penetrating one surface of the holding member 26, a rotating unit 28 supported by the holding member 26, and a drive source (not shown) that rotates the rotating unit 28. Prepare.

  The holding member 26 is a steel member and is fixed to the side frame 11 (see FIG. 1). The long hole 27 is formed in an arc shape with the axis C as the center, and the first end 24a of the wire 24 is inserted therein. The rotating part 28 is a steel member supported by the holding member 26 so as to be rotatable about the axis C, and the first end 24a of the wire 24 inserted into the elongated hole 27 is fixed.

  When the occupant presses a switch (not shown), the moving unit 25 drives a driving source such as a motor to rotate the rotating unit 28 about the axis C, thereby centering the axis C. The wire 24 is rotated. The moving unit 25 is configured so that the wire 24 does not rotate when the seated person does not press the switch.

  When the wire 24 is rotated around the axis C by the moving part 25, the eccentric part 24c of the wire 24 moves around the axis C, and the sub-plate 22 moves around the axis C. Since the attachment portion 22b of the sub plate 22 is rotatably supported by the eccentric portion 24c, the state in which the pressing surface 22a of the sub plate 22 is in contact with the main plate 21 when the wire 24 is rotated by the moving portion 25 is maintained. The sub plate 22 moves in the vertical direction and the front-back direction. Thereby, the position which presses the main plate 21 with the subplate 22, and the amount of extrusion can be adjusted. That is, the moving portion 25 can adjust the pressing position and the pushing amount of the main plate 21 (supporting ability of the seated person by the main plate 21) according to the seated person's preference.

  Here, as in the prior art (for example, Patent Document 1), the plate spring is bent by sliding the upper end of a plate spring (corresponding to the sub-plate 22 of the present embodiment) with the lower end fixed to bend up and down. When the pressing position and the pushing amount of the supporting member (corresponding to the main plate 21 of the present embodiment) are adjusted, the curvature of the leaf spring changes due to the adjustment of the pressing position and the pushing amount of the supporting member. Therefore, the load from the leaf spring to the support member concentrates, the load from the support member to the seat occupant concentrates on a part in the vertical direction, and the seat occupant may feel uncomfortable.

  In the present embodiment, since the entire sub-plate 22 is moved in the vertical direction and the front-rear direction by the moving unit 25, the pressing position and the push-out amount of the main plate 21 can be set according to the seated person's preference without changing the shape of the pressing surface 22a. Can be adjusted according to Thereby, it can suppress that the load from the subplate 22 to the main plate 21 concentrates on adjustment of the press position of the main plate 21, and the extrusion amount. As a result, it is possible to suppress the concentration of the load from the main plate 21 to the seated person, so it is possible to suppress a sense of incongruity when sitting.

  As shown in FIGS. 2 and 3, the main plate 21 includes a pair of left and right rails 21 b that extend rearward from the rear surface and extend in the vertical direction. Although the main plate 21 can be reinforced by the rail 21b, the main plate 21 is hardly bent in the vertical direction by the rail 21b. However, since the rail 21b is divided into a plurality of portions in the vertical direction by the plurality of cuts 21c extending in the left-right direction, it is possible to ensure the amount of deflection of the main plate 21 reinforced by the rails 21b.

  It should be noted that the ease of bending of the main plate 21 and the maximum amount of bending can be adjusted by adjusting the width (vertical dimension) and depth of the cut 21c and the distance between the cuts 21c. When the main plate 21 does not have the rail 21b and the cut 21c, the ease of bending and the maximum amount of bending of the main plate 21 depend on the material and shape of the main plate 21. On the other hand, in this Embodiment, the parameter for setting the ease of bending of the main plate 21 and the largest amount of bending can be increased by providing the rail 21b and the cut | interruption 21c in the main plate 21. FIG. Thereby, the freedom degree of the raw material and shape of the main plate 21 can be improved.

  For example, by adjusting the height of the rail 21b of the main plate 21 and the width of the cut 21c, the curvature (amount of deflection) of the main plate 21 can be adjusted by contact between the ends of the rails 21b divided by the cut 21c. You can regulate. Thereby, it can suppress that a curvature changes excessively up and down of the boundary of the site | part which the subplate 22 does not contact | connect in the main plate 21, and the site | part which the subplate 22 contacts.

  Since the sub plate 22 presses the main plate 21 between the pair of rails 21b, when the sub plate 22 is slid in the vertical direction with respect to the main plate 21 by the moving unit 25, the horizontal displacement of the sub plate 22 is shifted. This can be prevented by the rail 21b.

  In addition, since the main plate 21 is pressed by the sub plate 22 between the pair of rails 21b, the load applied to the main plate 21 can be dispersed as compared with the case where the rail 21b of the main plate 21 is pressed by the sub plate 22. Therefore, it is possible to make it difficult for the main plate 21 and the sub plate 22 to rub or wear.

  Next, a seat back frame 30 (hereinafter referred to as “frame 30”) in the second embodiment will be described with reference to FIGS. In the first embodiment, the case where there is no slit penetrating the main plate 21 in the thickness direction has been described. In contrast, in the second embodiment, a case will be described in which the side slits 35 and the end slits 36 penetrating the main plate 33 in the thickness direction are formed. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted.

  FIG. 4 is a rear view of the frame 30 in the second embodiment, and FIG. 5 is a cross-sectional view of the support 32 taken along the line V-V in FIG. 4 and 5 show a state where the sub plate 22 is slid to the lowermost position by the moving unit 25. FIG. In FIG. 5, illustration of the upper hooking portion 21 a and the lower hooking portion 34 of the main plate 33 is omitted. As shown in FIG. 4, in the frame 30, two steel springs 15 and 31 are bridged between a pair of side frames 11 and 12.

  As shown in FIGS. 4 and 5, the main plate 33 of the support body 32 of the frame 30 is a plate material made of synthetic resin that can be bent and deformed. The main plate 33 is disposed between the pair of side frames 11 and 12 and between the springs 15 and 31 with the front surface facing the seated person. The main plate 33 is provided with two upper hooking portions 21a on the upper edge and two lower hooking portions 34 on the lower edge. The upper hook portion 21 a is a portion that is hooked by the spring 15. The lower hooking portion 34 is a portion that is hooked on the spring 31. Accordingly, the upper and lower portions of the main plate 33 are fixed to the side frames 11 and 12 via the springs 15 and 31.

  Compared with the first embodiment in which only the upper part of the main plate 21 is fixed to the side frames 11 and 12, the upper and lower sides of the main plate 33 are fixed to the side frames 11 and 12 in this embodiment. The support force on the lower side of the can be improved. In particular, since the lower part of the main plate 33 is fixed to the side frames 11 and 12 via the spring 31, the supporting force on the lower side of the main plate 33 can be further improved using the elastic force of the spring 31.

  The main plate 33 has a pair of left and right rails 21b extending rearward from the rear surface and extending in the vertical direction, a pair of left and right side slits 35 extending through the main plate 33 in the plate thickness direction, and the main plate. An end slit 36 that penetrates 33 in the thickness direction and connects the lower ends of the side slits 35 is provided.

  The side slits 35 are provided on the left and right sides of the position where the main plate 33 is pressed against the sub plate 22 and on the lower side of the main plate 33. The main plate 33 is partitioned into a first portion 37 surrounded on three sides by the side slits 35 and the end slits 36, and a second portion 38 outside the first portion 37.

  By pressing the first part 37 with the sub-plate 22, the first part 37 projects to the seated person side with respect to the second part 38. Thereby, the area of the main plate 33 which supports a seated person can be increased. In particular, by providing the first part 37 at the position of the seated person's pelvis, the first part 37 supports the seated person's pelvis, and the second part 38 above the first part 37 supports the seated person's waist. can do. By providing the side slits 35 and the end slits 36 in this way, the degree of freedom in adjusting the supportability of the operator by the main plate 33 can be improved.

  The main plate 33 is provided with a bending slit 39 so as to be bent outward from the upper end of the side slit 35 in the left-right direction. The bending slit 39 is a portion that penetrates the main plate 33 in the thickness direction, and is continuous with the side slit 35. The first portion 37 pressed against the sub-plate 22 and the second portion 38 not pressed can be easily separated by the bending slit 39. As a result, the first portion 37 can be more easily deformed.

  Since the sub-plate 22 is movable in the left-right direction between the pair of rails 21b, when the side slits 35 are located inside the pair of rails 21b, the first portion 37 and the The sub-plate 22 may come into contact with the two portions 38. In this case, the first part 37 cannot be extended with respect to the second part 38. In order to project the first portion 37, it is necessary to adjust the left and right positions of the sub-plate 22, so that the supportability adjustment workability by the main plate 33 may be deteriorated.

  In the present embodiment, since the side slits 35 are provided outside the pair of rails 21 b, the sub-plate 22 can be reliably guided to the first part 37, and the first part 37 and the first part 37 are arranged on the left and right sides of the side slit 35. It is possible to prevent the subplate 22 from coming into contact with the two portions 38. As a result, since it is not necessary to adjust the left and right positions of the sub-plate 22, the supportability adjustment workability by the main plate 33 can be ensured.

  When the upper end of the side slit 35 is positioned above the upper edge of the sub-plate 22 in a state where the sub-plate 22 is slid to the lowest position by the moving part 25, only the first part 37 is pressed by the sub-plate 22. The In this case, the first part 37 projects so as to be bent at the boundary between the first part 37 and the second part 38, and the load from the main plate 33 to the seated person may concentrate, and the seated person may feel uncomfortable.

  In the present embodiment, the upper end of the side slit 35 is positioned below the upper edge of the subplate 22 in a state where the subplate 22 is slid to the lowest position. 2 part 38 is pressed. Thereby, it is possible to prevent the first portion 37 from protruding so as to be bent at the boundary between the first portion 37 and the second portion 38. That is, the first portion 37 and the second portion 38 above the first portion 37 can be bent and deformed so as to be smoothly continuous. As a result, it is possible to suppress the concentration of the load from the main plate 33 to the seated person, and to suppress a sense of discomfort during sitting.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed. For example, the shapes of the seat cushion frame 3, the frames 10 and 30, the main plates 21 and 33, the sub plate 22, the connecting portion 23, and the like are examples, and various shapes are naturally adopted.

  In the above embodiments, the case where the seat cushion frame 3 and the frames 10 and 30 are made of steel has been described. However, the present invention is not necessarily limited to this, and the material of each member can be changed as appropriate. Examples of materials other than steel include metal materials other than steel and synthetic resins. In addition, not only when at least the upper parts of the main plates 21 and 33 are fixed to the side frames 11 and 12 via the springs 15 and 31, but the frame and the main plate are naturally formed as an integrally molded product made of synthetic resin. Is possible.

  In each of the above embodiments, the case where the main plates 21 and 33 and the sub plate 22 are made of synthetic resin has been described. However, the present invention is not necessarily limited thereto. The material of the main plates 21 and 33 and the sub-plate 22 may be a synthetic resin reinforced with fiber instead of a simple synthetic resin. The main plates 21 and 33 and the sub plate 22 can be made of metal or rubber.

  In each of the above-described embodiments, the case where the main plates 21 and 33 are fixed to the side frames 11 and 12 via the springs 15 and 31 has been described. However, the present invention is not limited to this, and the main plates 21 and 33 are not limited to this. Naturally, it is possible to fix the main plates 21 and 33 to the side frames 11 and 12 directly, or to the side frames 11 and 12 via other than the springs 15 and 31. For example, the upper part of the main plate can be joined to the upper frame 13 by welding or bolts. It is also possible to rotatably support the upper portion of the main plate on a steel rod that spans the side frames 11 and 12.

  In the second embodiment, the case where the side slit 35 is provided on the lower side of the main plate 33 and the lower end of the side slit 35 is connected to the end slit 36 has been described, but the present invention is not necessarily limited thereto. . It is naturally possible to provide the side slits on the upper side of the main plate and connect the upper ends of the side slits with the end slits. By appropriately setting the position of the first part surrounded by the side slits and the end slits, it is possible to improve the degree of freedom in adjusting the support by the main plate.

  In each of the above-described embodiments, the moving unit 25 that rotates the wire 24 around the axis C with a driving source such as a motor, that is, the automatic moving unit 25 has been described, but the present invention is not necessarily limited thereto. Of course, the moving part can be manually operated. Examples of the manual moving unit include a lever provided on the outside of the side frame 11 that can rotate about the axis C, and the first end 24a of the wire 24 penetrating the side frame 11 fixed to the lever. It is done. According to this manual moving unit, the wire 24 can be rotated around the axis C by the seat occupant rotating the lever.

  Further, not only the rotary moving unit 25 but also a sliding type moving unit that moves the sub-plate 22 in at least one of the vertical direction and the front-rear direction can be used. As the sliding type moving unit, for example, vertically extending rods are provided on the side frames 11 and 12, respectively, both ends of the wires are inserted into the rods so that the wires can be slid vertically along the rods and attached to the wires. The subplate 22 can be slid up and down. The moving direction of the sub-plate 22 by the sliding type moving unit is not limited to the vertical direction, and may be a front-rear direction or a direction inclined with respect to the vertical direction and the front-rear direction.

DESCRIPTION OF SYMBOLS 10,30 Seat back frame 11,12 Side frame 21,33 Main plate 21b Rail 21c Cut line 22 Subplate 22a Pressing surface 23 Connection part 35 Side part slit 36 End part slit

Claims (5)

A pair of side frames arranged at predetermined intervals on the left and right;
A main plate disposed between the side frames, at least an upper portion of which is fixed to the side frames;
A sub-plate in which a pressing surface that presses the rear surface of the main plate is curved convexly toward the main plate along the vertical direction;
A seat back frame comprising: a connecting portion that connects the side frame and the sub plate and moves the entire sub plate in at least one of a vertical direction and a front-back direction. The main plate can be deformed by bending,
A pair of left and right rails extending from the left and right sides of the subplate toward the rear and extending in the vertical direction from the position pressed by the subplate;
The seat back frame according to claim 1, wherein the rail is divided into a plurality in the vertical direction by a plurality of cut lines extending in the left-right direction. The main plate can be deformed by bending,
A pair of side slits extending in the vertical direction on the left and right sides of the position pressed against the sub-plate;
The seat back frame according to claim 1, further comprising an end slit connecting the upper ends or the lower ends of the pair of side slits. The main plate has a pair of side slits extending in the vertical direction outside the pair of rails, and
The seat back frame according to claim 2, further comprising an end slit connecting the upper ends or the lower ends of the pair of side slits. The seat back frame according to any one of claims 1 to 4, wherein the pressing surface has a vertical curvature radius of 200 mm or more and 300 mm or less.

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