JPH0347568Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a lumbar support for a vehicle seat, in which a support member that is tiltable in the longitudinal direction of the vehicle is supported inside a seat bag, with a support member that is tiltable in the longitudinal direction of the vehicle with a substantially vertical center as a fulcrum.

BACKGROUND OF THE INVENTION It has been well known to provide a lumbar support of the type described above in a seat back in order to reduce fatigue of an occupant. This type of lumbar support has the advantage that the support member can be tilted, so that it can support a desired lumbar region according to the occupant's physique or preference.

FIG. 6 shows an example of a conventional vehicle seat equipped with this type of lumbar support, in which a support member 2a is housed inside the seat back 1.
The support member 2a can be adjusted and moved in the longitudinal directions X and Y of the vehicle as shown in FIG.
As shown by B, the support member 2a can be tilted in the front-rear direction of the vehicle using a substantially vertical center as a fulcrum 3a.

If the support member 2a is tilted so that its upper part 4a projects forward X of the vehicle as shown by the dashed line in FIG. Conversely, when the support member 2a is tilted as shown by the two-dot chain line to cause its lower part 5a to protrude forward X, this lower part 5a will now come into contact with the lower part of the waist. By adjusting the tilting position of the support member in this way, it is possible to change the vertical position of the support member that contacts the passenger's waist.

However, in the past, since the corner portions of the upper portion 4a and lower portion 5a of the support member 2a were angular, there was a risk that the corner portions would come into contact with the occupant's waist in a linear manner, giving the occupant an excessively strong sense of support. In order to eliminate this drawback, it is conceivable to round the upper and lower regions of the support member 2a as shown by the dashed line in FIG. When tilted to the position, the part 6a where the roundness begins will hit the passenger's waist, and since this part 6a is lower than the upper part 4a, there is a disadvantage that it impairs the feeling of vertical variation of the lumbar support region given to the passenger. .

OBJECTIVE The object of the invention is to provide a lumbar support of the type mentioned at the outset, which eliminates the above-mentioned conventional disadvantages.

Configuration In order to achieve the above object, the present invention proposes a configuration in which auxiliary support members each having a lumbar vertebra pressing surface are pivotally supported in the upper and lower parts of the support member so as to be rotatable in the longitudinal direction of the vehicle.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show a support member 2 of a lumbar support according to the present invention. This support member 2 is also accommodated in the seat back of the vehicle seat in the same way as shown in FIG. It can be tilted in any direction. Since the configuration for supporting the support member 2 on the seat back and the configuration for moving it in the front and rear directions X and Y or tilting it in the directions of arrows A and B are conventionally known, illustrations and explanations of these configurations will be provided. will be omitted (see, for example, Japanese Patent Laid-Open No. 58-206703 for details).

The upper part 4 and the lower part 5 of the support member 2 are provided with auxiliary support members 10 and 11 according to the present invention.
2 and 13 so as to be rotatable in the longitudinal direction of the vehicle as shown by arrows C and D, respectively.
These auxiliary support members 10 and 11 each have a lumbar vertebra pressing surface. When the support member 2 is tilted counterclockwise about the fulcrum 3 from the state shown in FIG. 2 and brought to the state shown in FIG. Hit the top. That is, the smooth large lumbar vertebra pressing surface 14 of the auxiliary support member 10 comes into contact with the occupant's lower back. Furthermore, since the auxiliary support member 10 is rotatable relative to the support member 2, it follows and fits the shape of the occupant's lumbar vertebrae. Therefore, the feeling of the support member hitting the passenger can be prevented, and the passenger can have his or her lower back supported while feeling a pleasant contact feeling that is not too strong, and can assume an optimal driving posture. When the support member 2 is tilted in the opposite direction to that shown in FIG. 3 and the lower part of the lower back is supported by the auxiliary support member 11 in the lower part 5, the lumbar pressing surface of the support member 2 has a large surface area against the passenger's lower back in exactly the same way. This can give the occupants a sense of comfort.

Further, when the support member 2 is brought to the neutral position shown in FIG. 2, the feeling of support for the occupant is not inhibited by the auxiliary support members 10 and 11. Moreover, unlike the case where the support member is only rounded as shown by the broken line in FIG. 7, the sense of vertical variation of the region supporting the lumbar vertebrae is not impaired.

The auxiliary support member 10 can be supported by the support member 2 in any suitable form, but in the illustrated example, as shown in FIGS. 4 and 5, the upper part 4 of the support member 2
Two curled portions 15 are formed by cutting and raising this member itself, and support pieces 16 are also formed on a part of the auxiliary support member 10 by cutting and raising the support pieces 16. A pin 12 is inserted through the drilled support hole and the curled portion 15, thereby pivotally supporting the auxiliary support member 10 to the support member 2. Also inserted pin 1
Stoppers 17 formed by cutting and raising the support member 2 are located on both sides of the support member 2, and these stoppers prevent the pin 11 from coming off. The lower auxiliary support member 11 is also pivotally supported by the support member 2 in exactly the same manner.

Effects According to the present invention, an auxiliary support member having a lumbar pressing surface is attached to each of the upper and lower parts of the support member which can be tilted in the longitudinal direction of the vehicle using the substantially vertical center as a fulcrum. Because it is pivoted so that it can move freely, when the support member tilts so that the upper part of the support member protrudes toward the passenger, the lumbar press surface of the upper auxiliary support member hits the passenger's lower back and follows the shape of the passenger's lumbar vertebrae. Similarly, when the lower part of the support member protrudes toward the occupant, the lumbar press surface of the lower auxiliary support member follows and hits the lower back of the occupant, thereby causing the support member to press against the occupant. It is possible to prevent the feeling of contact with the line, and to provide the occupant with a pleasant feeling of contact with the surface without being too strong.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a support member of a lumbar support according to the present invention and an auxiliary support member pivotally supported thereon, and Fig. 2 is a sectional view taken along the line - - of Fig. 1, with some parts omitted. Figure 3 is a sectional view similar to Figure 2 when the support member is tilted, Figure 4 is an exploded perspective view of each element shown in Figure 1, and Figure 5 is a cross-sectional view similar to Figure 2 when the support member is tilted. FIG. 1 is a plan view, FIG. 6 is a perspective view of a seat having a conventional lumbar support, and FIG. 7 is a sectional view taken along the line -- in FIG. 6, showing a support member of a conventional lumbar support. 1...Seat back, 2...Support member, 3
...Fully point, 4...Top, 5...Bottom, 10, 11
... Auxiliary support member, 14 ... Lumbar vertebra pressing surface.

Claims (1)

[Scope of Claim for Utility Model Registration] In a lumbar support for a vehicle seat that supports a support member that is tiltable in the longitudinal direction of the vehicle with a fulcrum approximately at the center in the vertical direction inside the seat bag, each of the upper and lower parts of the support member To,
A lumbar support characterized in that an auxiliary support member having a lumbar vertebrae pressing surface is pivotably supported in the longitudinal direction of a vehicle.