JPH06117A - Seat back - Google Patents

Abstract

PURPOSE:To assure the pressing force to a passenger by the advance of a plate part without an odd feeling and to improve a seating feel by connecting the longitudinal part of a spring for the seat back at the plate parts of a lumbar support. CONSTITUTION:The upper side and central part 7 of square parts 5 of the spring 4 for the seat back are freely turnably connected by using hooks in upper u-shape parts 8 extending in the longitudinal direction. The central part 7 and the lower sides of the square parts 5 are freely turnably connected by a pair of central u-shape parts 9 and a pair of lower inverted u-shape parts 10 by using hooks. Connecting parts 11 formed by using the hooks of the u-shape parts 9 and the inverted u-shape parts 10 are positioned on the front surface of the plate part 3. The connecting parts 11 freely turnably support the springs extending in the vertical longitudinal direction by using the hooks and, therefore, the directions of the upper and lower springs is largely changed as if the spring is bent in this part when the plate part 3 of the lumbar support is advanced. The pressing force to the passenger is assured by the small operating force as the advance of the plate part 3 is enabled.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a seat back having a lumbar support.

[0002]

2. Description of the Related Art An automobile seat is composed of a seat back and a seat cushion, and a seat back which serves as an occupant's backrest is, for example, the Japanese Utility Model Laid-Open No. 61-70141.
As disclosed in the publication, it has at least a spring stretched over the seat frame and a trim cover assembly covering the spring.

The spring and the trim cover assembly give rigidity required for the seat back and elasticity to the human body contact portion to improve the seating feeling, but in order to adjust the support strength of the occupant's waist, Use lumbar support. The lumbar support has both ends thereof supported by the side frames of the side frame and has a rectangular plate portion in a portion corresponding to the waist of the occupant. , Allows the plate part to move forward and backward. The occupant moves the plate part forward and backward,
Get the strength you like.

[0004]

In a seat back having a lumbar support, a seat back spring is located in front of a plate portion of the lumbar support, and the spring and the lumbar support are wrapped with a trim cover assembly. Even if the lumbar support is operated and its plate portion is moved forward to increase the support force to the lumbar region, the spring resists the movement of the plate portion and the support force does not increase. Therefore, there is an attempt to omit the provision of the spring on the front surface of the plate portion, but the absence of the spring only on the plate portion gives the occupant a feeling of discomfort and the plate portion gives the occupant a foreign body sensation.

Therefore, it is an object of the present invention to solve the above-mentioned problems of the prior art.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention basically arranges the longitudinal portion of the front spring of the plate portion of the lumbar support and places the spring on the front surface of the plate portion. The concept of providing a joint part of is adopted.

More specifically, the present invention has at least a seatback spring stretched over a seatback frame and a lantern support boat supported by the seatback frame, and the seatback spring is arranged in a vertical direction. The seat back is characterized in that it has a closed portion, and this portion is rotatably connected by a lumbar support portion.

Preferably, a longitudinal portion of the seatback spring has a u-shaped portion and an inverted u-shaped portion, and the u-shaped portion and the inverted u-shaped portion.
The character part is rotatably connected with a clip in front of the lumbar support. Further, the lateral groove of the spring receiving member forming the trim cover assembly that covers the seatback spring is opposed to the lumbar support via the seatback spring.

According to the present invention, when the lumbar support is operated to move the plate portion forward so as to increase the pressing force on the lumbar region of the occupant, the rotating portion of the spring in front of the lumbar support prevents the plate portion from moving forward. Since it is not present, the necessary pressing force can be obtained without feeling foreign matter.

[0010]

EXAMPLE Referring to FIG. The lumbar support 2 is attached so that both ends thereof are supported by the opposite side walls of the seat back frame 1. The lumbar support 2 uses a device (not shown), for example, a device disclosed in Japanese Utility Model Laid-Open No. 58-141966, to move the plate portion 3 forward and backward so that the pressing force on the lumbar region of the occupant can be adjusted. A seat back spring 4 is stretched over the seat back frame 1 in order to obtain a support force for the occupant's backrest.

The seat back spring 4 has a rectangular portion 5 extending along the inside of the seat back frame 1, and the rectangular portion 5 has four mounting portions 6 for mounting the seat back frame 1.
Elastically supported by. A central portion 7 which extends laterally in the center of the rectangular portion 5 and whose both ends are supported by the seat back frame 1 is rotatably supported by the rectangular portion 5 using hooks.

The upper side of the rectangular portion 5 and the central portion 7 are rotatably connected by a hook at an upper u-shaped portion 8 extending in the vertical direction. The central portion 7 and the lower side of the square portion 5 are connected to each other by a central u-shaped portion 9 of the pair.
And the lower inverted u-shaped portion 10 of the pair are rotatably connected using a hook. The connecting portion 11 using the hooks of the u-shaped portion 9 and the inverted u-shaped portion 10 is positioned on the front surface of the plate portion 3.

Referring to FIG. Seat back frame 1
The lumbar support 2 is supported on the opposite side frame of the plate and the plate part 3 can be moved forward and backward. The seat back spring 12 has a wavy shape, and an upper end of the seat back spring 12 is rotatably supported on the upper frame of the seat back frame 1 by using a hook and a lower end of the seat back frame 1 is attached to a horizontal bar 13 on the front surface of the plate portion 3 by using a hook. A plurality of upper portions 14 rotatably supported and a corrugated shape, the lower end of which is rotatably supported on the lower frame of the seat back frame 1 by using hooks and the upper end of which hooks on the front surface of the plate portion. A horizontal bar 13 and a plurality of lower parts 15 rotatably supported on an upper part 14 are used. The connecting portion 11 between the upper portion 14 and the lower portion 15 is located on the front surface of the plate portion 3.

As shown in FIG. 3, when the plate portion 3 of the lumbar support is moved forward, the connecting portion 11 rotatably supports the springs extending in the vertical direction in the vertical direction using the hooks. The direction of the upper and lower springs is largely changed as if it were a bent portion, so that the plate portion 3 can be moved forward. Therefore, the pressing force to the occupant can be secured with a small operating force.

Referring to FIG. 4, the trim cover assembly 16 is shown.
, A plurality of grooves 18 extending in the lateral direction are provided on the inner surface of the spring receiving member 17 facing the plate portion 3. These grooves 18 reduce the resistance of the trim cover assembly 16 to the plate portion 3 when the plate portion 3 is advanced.

[0016]

According to the present invention, the seating feeling can be improved because the pressing force to the occupant due to the forward movement of the plate portion can be secured without feeling a foreign object without omitting the vertical spring. Also, the operating force of the lumbar support can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of an example of the present invention.

FIG. 2 is a front view of another example of the present invention.

FIG. 3 is a diagram showing a relationship between an occupant, a plate, and a spring.

FIG. 4 is a sectional view showing an improvement of a spring receiving member.

[Explanation of symbols]

 1 seat back frame 2 lumbar support 3 plate part 4, 12 seat back spring 11 connecting part

Claims (3)

[Claims] 1. A seatback spring stretched on a seatback frame and a lumbar support supported on the seatback frame, and at least a portion in which the seatback spring is vertically arranged. , A seat back characterized in that this portion is rotatably coupled by a lumbar support portion. 2. A longitudinal portion of a seatback spring has a u-shaped portion and an inverted u-shaped portion, and the u-shaped portion and the inverted u-shaped portion are rotatably coupled with a clip in front of a lumbar support. The seat back according to claim 1. 3. The seat back according to claim 1, wherein a lateral groove of a spring receiving member constituting the trim cover assembly for covering the seat back spring is opposed to the lumbar support via the seat back spring.