JPH0523098Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a seat mounted in a passenger car, for example, and particularly relates to a support structure for the lumbar region thereof.

[Conventional technology]

In recent years, for example, passenger car seats have come into practical use, with a resin support mat built into the seat back, which comfortably supports the back of the seated person from the upper back to the lumbar region. has been made into

To explain an example of a conventional seat with a built-in resin support mat of this type, in FIG. 4, 1 indicates the seat as a whole, 2 indicates the seat cushion,
Reference numeral 3 denotes a seat bag, and a resin support mat (hereinafter referred to as resin mat) 4 having a required size is disposed within the seat bag 3. As shown in FIG. 5, this resin mat 4 has a large number of hollow holes 5 formed therein, and has appropriate flexibility to suitably support the body of the seated person. The resin mat 4 is elastically supported by a seat bag frame 6 disposed inside the seat bag 3 via a plurality of tension springs 7, that is, three tension springs 7 on the left and right sides in this example. That is, the side frames 8 fixed to both sides of the seat back frame 6
One end side arm of the tension spring 7 is engaged with the locking protrusion 9, and the other end side arm is engaged with the side edge of the resin mat 4, whereby the resin mat 4 is It is elastically supported by the seat back frame 6 and configured to elastically support the load of the seated person.

In addition, in this seat 1, the shape of the resin mat 4 is formed to match the line of the body so that the support of the lumbar region in particular is optimized, and the lowermost tension spring 7 corresponding to the lumbar region is It is stronger than the tension spring.

When a seated person sits on the seat 1 constructed in this manner, the resin mat 4 supports the seated person's body comfortably and provides a suitable feeling of support to the lumbar region. The aim is to reduce fatigue caused by sitting for long periods of time.

[The problem that the idea aims to solve]

However, since this conventional seat has a structure in which the resin mat 4 is supported entirely by the tension spring 7 against the seat back frame 6, a so-called depression phenomenon of the tension spring 7 occurs when the seat is seated, that is, as shown in FIG. As shown by the dotted chain line, the tension spring 7 rotates so as to be depressed, and at this time, the tension spring 7 simply rotates with the movement of the resin mat 4, so that almost no elasticity acts on the resin mat 4. For this reason, there is a problem that suitable support for the lumbar region cannot be obtained.

This depression of the tension spring cannot be eliminated even with a mounting structure in which the arm portion of the tension spring 7 is fixed to the locking protrusion 9.

The present invention was developed in view of the above, and aims to provide a seat that provides sufficient support for the lumbar region by slightly improving the support structure of the resin mat.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a seatback frame, a resin mat suspended from the seatback frame, a torsion bar that supports the lower end of the resin mat, and a torsion bar that supports the resin mat above the torsion bar. The torsion bar includes a plurality of pairs of tension springs that support the torsion bar, and the torsion bar has both ends attached to the seat back frame, and the center portion is bulged in an arch shape so as to be forward of the both end positions, and The center portion of the torsion bar is fixed to the resin mat to elastically support the resin mat.

[Effect]

By elastically supporting the resin mat in the lumbar support part with the torsion bar,
The lack of support for the lumbar vertebrae due to depression of the tension spring can be resolved, and sufficient support for the lumbar vertebrae can be obtained.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. Parts corresponding to those of the conventional example shown in FIG.

In the seat of the present invention, a torsion bar 11 is used as an elastic support member for a resin mat 4 in a lumbar support portion.
It uses That is, in place of both lowermost tension springs 7 in the conventional example shown in FIG.
1 supports the lower part of the resin mat 4, that is, the lumbar support region.

This torsion bar 11 has a shape in which the center part thereof is bent in a square shape, and both ends are respectively bent inward in a U-shape. The seatback frame 6 is curved so that the U-shaped portions at both ends thereof are locked and fixed to clamp pieces 12 fixed to both sides of the seat back frame 6.

On the other hand, locking claws 13a, 13b, and 13c are formed at three locations on the lower back surface side of the resin mat 4, and these locking claws 13a, 13b, and 13c are connected to the central horizontal portion 11a of the torsion bar 11 and to the central horizontal portion 11a of the torsion bar 11, respectively. The resin mat 4 is fixedly supported on the torsion bar 11 by being engaged with the vertical portions 11b and 11c.

When a seated person takes a seat on this example seat configured as described above, the torsion bar 11 is bent by the load, and the resin mat 4 itself is also bent, and the elasticity of the torsion bar 11 and the elasticity of the resin mat 4 causes the torsion bar 11 to bend. Sufficient lumbar support can be obtained.

In this way, in the seat of this example, the resin mat 4 is supported by the torsion bar 11 in the lumbar support portion, thereby eliminating the lack of support for the lumbar region caused by the depression of the tension spring as in the past. Resin mat 4 that can provide the elastic support characteristics of 11 and a suitable lumbar support effect without providing a lumbar support adjustment mechanism.
By combining these characteristics, it is possible to obtain optimal lumbar support characteristics.

Although the embodiment of the present invention has been described above, the present invention is not limited to the configuration of this embodiment.
It can be modified as appropriate for practical use.
For example, the torsion bar 11 is not limited to the bent shape of this embodiment, but may have any shape that can suitably elastically support the resin mat 4. Furthermore, it goes without saying that the present invention is applicable not only to passenger car seats but also to general furniture seats.

[Effect of idea]

As described above, according to the present invention, the resin mat is elastically supported by the torsion bar in the lumbar support part, so that the pad receiver is not easily supported by the tension spring. It is possible to eliminate the lack of support for the lumbar region due to depression, and the characteristics of the torsion bar and resin mat match to provide optimal support for the lumbar region. Since it is supported, appropriate elasticity can be obtained, which has the effect of providing a comfortable sitting feeling to the seated person.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a cross-sectional view of the lumbar support part, Figure 3 is an exploded perspective view of the same, Figure 4 is a side view showing a seat with a built-in resin mat, Figure 5 is a perspective view of a conventional example, and Figure 6 is a side view of the seat with a built-in resin mat.
The figure is an explanatory diagram of depression of a tension spring in a conventional example. In the figure, 4 is a resin mat, 6 is a seat back frame, and 11 is a torsion bar.

Claims (1)

[Scope of Claim for Utility Model Registration] A seatback frame, a resin pine suspended from the seatback frame, a torsion bar that supports the lower end of the resin pine, and a plurality of pine that support the resin pine above the torsion bar. and a pair of tension springs, wherein both ends of the torsion bar are attached to the seatback frame, and the center portion is bulged out in an arch shape so as to be forward of the positions of both ends, and
A seat characterized in that a central portion of the torsion bar is fixed to the resin mat to elastically support the resin mat.