JP3774937B2 - Seat back frame - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a seat frame of a vehicle seat, a seat frame constituting a seat back, and a seat back frame constituting a seat back. In the present specification, the name of the seat frame is used as a general term for the cushion frame of the seat cushion constituting the seat and the seat back frame constituting the seat back unless otherwise specified.
[0002]
[Prior art]
A vehicle seat includes a seat cushion that constitutes a seating portion and a seatback that constitutes a backrest. A normal seat cushion and seat back are configured by a combination of a seat frame and a urethane cushion or a urethane pad. The seat frame is a base structure of a seat cushion or a seat back, and for the seat back frame related to the seat back, an S spring type as shown in FIG. 12 or a full form type as shown in FIG. 13 is often used. As shown in FIG. 12, the S spring type is formed by stretching the S spring 102 formed in a waveform between two longitudinal sides of the back frame 101 formed of a pipe material or the like in a substantially square frame shape in multiple stages. Has been. The backing of the urethane pad to be attached to the front is formed by the multi-stage S spring 102, and the seating comfort performance and the riding comfort performance as the backrest of the vehicle seat by both the elastic bending of the S spring 102 and the bending of the urethane pad. Is secured.
[0003]
On the other hand, as shown in FIG. 13, the full-form type is configured by stretching wires 103 in a tensioned state in multiple stages between two longitudinal sides of a back frame 101 formed of a pipe material or the like in a substantially square frame shape. Has been. The back of the urethane pad to be attached to the front is formed by the multi-stage wire 103, and the seating comfort performance and the riding comfort performance as a vehicle seat are ensured by the bending of the urethane pad held by the back support.
[0004]
[Problems to be solved by the invention]
In the conventional seat back frame as described above, the S spring type is troublesome and complicated in the processing of the S spring 102, and the assembling work is complicated, so that the cost is high and the vertical direction with respect to the back when sitting is continuous. The lack of support wins. On the other hand, the full-form type can be manufactured by a simple operation such as stretching the wire 103, but is low in cost. However, since it does not have flexibility, the performance of the urethane pad regulates the flexibility and ride comfort. In terms of performance, it is inferior to the S spring type.
[0005]
Accordingly, the present invention has been made to solve the above-described conventional problems, and the problem is to obtain a seat frame that is easy to manufacture and has good performance, and that is easy to manufacture and has good performance. It is to obtain a back frame, and to improve the function of the seat frame and to reduce the cost.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 includes a line segment portion along one side in the longitudinal direction of a back frame configured in a substantially rectangular frame shape, and a side in the lateral direction adjacent to the one side of the back frame. Two substantially L-shaped wires consisting of a line segment along the line are arranged symmetrically with an interval between them, and a line segment along one side in the vertical direction forms a back support part that is continuous in the vertical direction. It is arranged so that the line segment along one side of the direction is located at the waist, forming the waist support, and the wire is bent so that the interval between the line segments forming the waist support is narrowed In addition, a flexible structure having an elastic member that expands and contracts between the bent portions is attached to the back frame on the free end side of each line segment portion and stretched in the frame of the back frame. Adopt a means to do.
[0007]
By adopting the above-mentioned means, a seat back frame can be manufactured by mounting a flexure structure in which two wires are connected to the back frame by an elastic member on the free end side of each line segment portion. The flexibility is given to the whole by expansion and contraction of the elastic member. The back portion that is continuous in the vertical direction can be supported by the line segment along the one side in the vertical direction. And the support with respect to a waist | hip | lumbar part periphery can be performed by the line segment part along the one side of the horizontal direction arrange | positioned so that it may be located in a waist | hip | lumbar part.
[0008]
In order to achieve the above-mentioned object, the invention of claim 2 includes a line segment portion along one side in the vertical direction of the back frame configured in a substantially square frame shape, and a side in the horizontal direction adjacent to the one side of the back frame. Two substantially L-shaped wires consisting of a line segment along the line are arranged symmetrically with an interval between them, and a line segment along one side in the vertical direction forms a back support part that is continuous in the vertical direction. It is arranged so that the line segment along one side of the direction is located at the waist, forming the waist support, and the wire is bent so that the interval between the line segments forming the waist support is narrowed In addition, a coil spring is provided at a position between the bent portions. The coil spring is coupled to the bent portion on one side, and the spring force can be varied for the bent portion on the other side. To be coupled through the deflection adjusting means Cage, deflection adjusting means, means comprising a release wire connected to the coil spring, the release wire is inserted, and a flexible tube coupled to the bent portion, the release wire winding, the winding means to rewind Is adopted.
[0009]
By adopting the above-mentioned means, a seat back frame can be manufactured by mounting a flexure structure in which an elastic member is provided between two wires on the free end side of each line segment portion on the back frame. The structure is given flexibility by the expansion and contraction of the elastic member. The back portion that is continuous in the vertical direction can be supported by the line segment along the one side in the vertical direction. And the support with respect to a waist | hip | lumbar part periphery can be performed by the line segment part along the one side of the horizontal direction arrange | positioned so that it may be located in a waist | hip | lumbar part. Further, the flexural rigidity of the waist support portion in the flexure structure can be varied by changing the spring force of the coil spring by the flexure adjusting means. Specifically, by winding or rewinding the release wire, one end of the coil spring is pulled or returned to change the spring force of the coil spring. Thereby, the lumbar support effect can be adjusted by adjusting the flexural rigidity of the support portion of the waist.
[0010]
In order to achieve the above object, a third aspect of the present invention is the above-described means according to the first or second aspect , wherein each of the free end sides is hung on a resin mounting member mounted on a back frame. Thus, a means for stretching the frame within the frame of the back frame is employed.
[0011]
By adopting the above means, the displacement on the free end side of each line segment part accompanying the bending of the flexible structure is performed in the resin mounting member together with the function according to claim 1 or claim 2.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 of the Invention
1 to 6 relate to the first embodiment and show a seat back frame 1 for a seat back constituting a seat of a vehicle. As shown in FIG. 1 as a whole, the seat back frame 1 has a structure in which a bending structure 3 is stretched on a back frame 2 configured in a substantially square frame-like backrest shape. The back frame 2 is basically made of a substantially rectangular frame shape composed of two vertical left and right sides with moderate warping on the back side and two horizontal upper and lower sides connecting the upper and lower sides. It is comprised by the pipe material. The structure shown in FIG. 1 has a surface structure 4 in which the lower portions of the left and right sides protrude forward in order to obtain restraint around the waist, and the structure shown in FIG. Pipe frame type. In any of these, two headrest support brackets 5 are fixed to the upper side with a gap in the center.
[0015]
As shown in FIG. 3, the bending structure 3 is substantially composed of a long line segment part 6 along the left and right sides of the back frame 2 and a short line segment part 7 along the horizontal side adjacent to the left and right sides. In this configuration, eight L-shaped wires are arranged symmetrically at intervals, and are connected by a coil spring 9 as an elastic member that expands and contracts between the short line segments 7 of the wires 8. The two long line segment portions 6 extend in parallel with a space therebetween, and their free end sides are bent back into a hook shape on the back side to form a mounting portion 10. The length of the long line segment portion 6 excluding the attachment portion 10 is configured to be slightly shorter than the length of one side of the back frame 2. The two short line segments 7 extend in directions away from each other, and their free ends are bent back like hooks on the back side to form a mounting portion 10. The length of each short line segment portion 7 excluding the attachment portion 10 and the coil spring 9 on the straight line is configured to be shorter than the length of one side of the upper and lower sides of the back frame 2.
[0016]
The flexure structure 3 having the above-described configuration includes two resin upper mounting members 11 mounted at positions close to the headrest support bracket 5 on the upper side of the back frame 2, and lower surfaces of the left and right sides. It is attached to the back frame 2 via the left and right resin side attachment members 12 attached to the structure 4. As shown in FIG. 4, the upper mounting member 11 is formed in a bowl shape and is mounted by its own elastic force so as to straddle the back frame 2. The upper mounting member 11 is provided with a groove portion 13 that circulates the back frame 2 leaving the lower side thereof, and the mounting portion formed on each free end side of the long line segment portion 6 of the bending structure 3 in the groove portion 13. 10 is hooked. As shown in FIG. 5, the side attachment member 12 is formed in a substantially L shape, a groove 13 is provided at the center of the surface, and a sleeve 14 projects integrally on the back. Attachment of the side attachment member 12 to the back frame 2 is performed by fitting each sleeve 14 into a retaining hole 4 </ b> A formed in the surface structure 4 of the back frame 2. A mounting portion 10 formed on each free end side of each short line segment portion 7 of the flexure structure 3 is inserted into the sleeve 14 in the groove portion 13 of the side mounting member 12 mounted on the left and right sides of the back frame 2 and hooked by the end of the sleeve 14. Worn. Thereby, the bending structure 3 is tensioned in the frame of the back frame 2. Each attachment portion 10 of the flexure structure 3 can be slidably displaced around the center line of the back frame 2 in each groove portion 13 of the upper attachment member 11 or the side attachment member 12.
[0017]
The seat back shown in FIG. 6 is configured in which a seat back pad P formed of urethane foam or the like is attached to the front portion of the seat back frame 1 configured as described above so as to wrap the seat back frame 1 and functions as a backrest. The The bending structure 3 hits the back surface of the seat back pad P as a back surface support. When a person is seated on the seat having the seat back, the long line segment portion 6 of the flexure structure 3 supports the back continuously in the vertical direction, and the short line segment portion 7 supports the waist and pelvis. Can take a comfortable sitting posture. Then, the seat back pad P is bent by the seating, and a load is applied to each wire 8 of the bending structure 3. At this time, the coil spring 9 attracting each wire 8 is pushed right and left to bend the entire flexible structure 3 elastically backward.
[0018]
That is, the seating comfort performance and the riding comfort performance as the backrest of the vehicle seat are ensured by the action of both the bending of the seat back pad P and the bending of the bending structure 3. Each mounting portion 10 is rotationally displaced around the frame as the bending structure 3 is bent. However, the displacement is smooth because it is displaced so as to slide along the groove portion 13 of the resin upper mounting member 11 and the side mounting member 12. No sound is generated. As described above, the seat back frame 1 according to the first embodiment has a simple configuration and is easy to assemble as compared with the S spring type, so that it can be manufactured at a low cost and is excellent in performance. Then, by changing only the coil spring 9, various seat back frames 1 having different bending rigidity of the bending structure 3 can be manufactured.
[0019]
In addition, although the coil spring 9 is easy to apply and functional as an elastic member, you may comprise with rubber | gum. Alternatively, the attachment portions 10 on the respective free end sides of the flexible structure 3 can be directly hooked by opening the hook holes in the back frame 2 and inserting them into these. In addition, the angle between the long line segment portion 6 and the short line segment portion 7 of each wire 8 is approximately 90 degrees in the illustrated example, but may be set larger than 90 degrees depending on how the waist is supported. is there.
[0020]
Embodiment 2 of the Invention
FIGS. 7 to 9 relate to the second embodiment and show a seat back frame 1 for a seat back constituting a vehicle seat. The seat back frame 1 according to the second embodiment is configured such that the action of the spring force of the coil spring 9 in the bending structure 3 of the seat back frame 1 shown in the first embodiment can be adjusted. The configuration is the same as that of the first embodiment except for the configuration according to FIG. Therefore, the same parts as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof will be omitted.
[0021]
In the seat back frame 1 of the second embodiment, the bending rigidity of the bending structure 3 shown in the first embodiment is made variable by adjusting the expansion and contraction of the coil spring 9. That is, a configuration is adopted in which one end of the coil spring 9 can be pulled or returned by the adjusting means 15 attached to the surface structure 4 of the back frame 2 via the release. As shown in FIG. 9, the adjusting means 15 is configured by a winding device 18 having a brake mechanism 17 that winds and rewinds the release wire 16, and is configured to be able to wind and rewind the release wire 16 by operating the knob 19. . As shown in FIG. 8, the end of the release wire 16 is connected to one end of the coil spring 9, and one end of the flexible tube 20 through which the release wire 16 is inserted is fixed to a corner portion of the one wire 8.
[0022]
When the release wire 16 is wound or unwound by the adjusting means 15 with the above configuration, one end of the coil spring 9 is pulled or returned to change the spring force of the coil spring 9. That is, the bending rigidity of the bending structure 3 can be adjusted, and the sitting comfort can be adjusted by adjusting the bending property, and the lumbar support effect can be obtained. Since other functions and advantages are the same as those of the first embodiment, description thereof is omitted.
[0023]
Embodiment 3 of the Invention
FIG. 10 relates to the third embodiment, and shows a cushion frame 21 for a seat cushion constituting a vehicle seat. The cushion frame 21 according to the third embodiment is configured as a frame 22 having a frame structure in which the back frame 2 shown in the first embodiment is seated, and the flexible structure 3 shown in the first embodiment is stretched in the frame. It is a suspended configuration. That is, the bending structure 3 is applied to the cushion frame 21 of the seat cushion. As a result, a seat cushion having a good sitting comfort due to both the bending of the urethane cushion K and the bending of the bending structure 3 can be obtained. Other functions and advantages are basically the same as those of the first embodiment.
[0024]
As shown in FIG. 11, two sets of flexure structures 3 may be stretched symmetrically on the frame 22. In this case, it may not be necessary to add the length as shown in each of the above embodiments to the segment of each wire 8.
[0025]
【The invention's effect】
According to the first aspect of the present invention, the seat back frame can be manufactured by mounting a flexure structure in which two wires are connected to the back frame by an elastic member on the free end side of each line segment. The structure is flexible as a whole by the expansion and contraction of the elastic member , and it can support the back part that is continuous in the vertical direction by the line segment along one side in the vertical direction, and is arranged in the lateral direction so as to be located at the waist. Support for the periphery of the lumbar region can be made by a line segment along one side. Therefore, a low-cost seat back frame that is easy to manufacture and has good performance can be obtained.
[0026]
According to the invention of claim 2, a seat back frame can be manufactured by mounting a flexure structure in which an elastic member is provided between two wires on the free end side of each line segment portion on the back frame. The flexible structure is given flexibility by the expansion and contraction of the elastic member, and it can support the back part that is continuous in the vertical direction by the line segment part along one side in the vertical direction, and is arranged so as to be located at the waist. Support for the periphery of the waist can be achieved by a line segment along one side in the direction. Therefore, a low-cost seat back frame that is easy to manufacture and has good performance can be obtained. Furthermore, the bending rigidity of the portion supporting the waist portion of the bending structure can be changed by adjusting the spring force of the coil spring, and the function of the seat back frame is improved.
[0027]
According to the invention of claim 3, in addition to the above-described effect according to claim 1 or 2, the displacement on the free end side of each line segment part accompanying the bending of the portion that supports the waist part of the bending structure is performed in the resin mounting member. Therefore, the generation of abnormal noise can be prevented and the function of the seat back frame is improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a seat back frame according to a first embodiment of the invention.
FIG. 2 is a perspective view of another seat back frame according to the first embodiment of the present invention.
FIG. 3 is a perspective view of a bending structure according to the first embodiment of the invention.
4 is an exploded perspective view mainly composed of an arrow A portion in FIG. 1. FIG.
5 is an exploded perspective view mainly including an arrow B portion in FIG. 1. FIG.
FIG. 6 is a sectional view of a seat back using the seat back frame according to the first embodiment of the invention.
7 is a perspective view of a seat back frame according to a second embodiment of the invention. FIG.
8 is an enlarged perspective view mainly having an arrow C portion in FIG.
FIG. 9 is a side view of a seat back frame adjusting means according to a second embodiment of the invention.
FIG. 10 is a perspective view of a cushion frame according to a third embodiment of the invention.
FIG. 11 is a plan view of another cushion frame according to the third embodiment of the present invention.
FIG. 12 is a perspective view of a conventional seat back frame.
FIG. 13 is a perspective view of another conventional seat back frame.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seat back frame 2 Back frame 3 Deflection structure 6 Long line segment part 7 Short line segment part 8 Wire 9 Coil spring 10 Attachment part 11 Upper part attachment member 12 Side part attachment member 15 Adjustment means 21 Cushion frame 22 Frame

Claims (3)

A substantially L-shaped wire consisting of a line segment portion along one side in the vertical direction of the back frame configured in a substantially square frame shape and a line segment portion along one side in the horizontal direction adjacent to the one side of the back frame. Two are arranged symmetrically at intervals,
A line segment portion along one side in the vertical direction forms a support portion for the back portion which is continuous in the vertical direction,
Arranged so that the line segment along one side in the horizontal direction is located in the waist, forming a support for the waist,
The wire is bent so that the interval between the line segments of the portion forming the support portion of the waist is narrowed,
A structure in which a flexible structure having an elastic member that expands and contracts between the bent portions is attached to the back frame on the free end side of each line segment portion and stretched in the frame of the back frame. A seat back frame characterized by that. A substantially L-shaped wire consisting of a line segment along one side in the vertical direction of the back frame configured in a substantially rectangular frame shape and a line segment along one side in the horizontal direction adjacent to the one side of the back frame. Two are arranged symmetrically at intervals,
  A line segment portion along one side in the vertical direction forms a support portion for the back portion which is continuous in the vertical direction,
  Arranged so that the line segment along one side of the horizontal direction is located in the waist, forming a support portion of the waist,
  The wire is bent so that the interval between the line segments of the part forming the support portion of the waist is narrowed,
  A coil spring is provided at a position between the bent portions, and the coil spring is connected to the bent portion on one side and is bent to make the spring force variable with respect to the bent portion on the other side. Are connected via adjustment means,
  The deflection adjusting means includes a release wire connected to a coil spring, a flexible tube through which the release wire is inserted and coupled to the bent portion, and a winding means for winding and unwinding the release wire. Characteristic seat back frame. The seat back frame according to claim 1 or 2,
  A seat back frame characterized by having a structure in which each free end side is hung on a resin mounting member mounted on a back frame, and a flexible structure is stretched in the frame of the back frame.

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