JPH07313291A - Back part support device in vehicle seat - Google Patents

Abstract

PURPOSE:To easily fit the whole surface of a seat back to the back part to reduce the fatigue by providing a support plate on the rod of a back frame through a link, supporting a support wire and the rod by a spring member, and positively and reversely rotating the rod by an actuator to longitudinally protrude and recess the support plate. CONSTITUTION:The support rod 14 of a back frame 10a is supported by the lower end of each side frame part 11a, 11b of a frame body 11, and the lower end part of a support wire 16 is fixed to the upper edge part of a support plate 15. The front end of each link 17 is connected to the rear side surface of the support plate 15, and the rear end is connected to the support rod 14. The support wire 16 is fixed to each S-spring, and the support plate 15 is supported by each side frame part 11a, 11b and each S-spring 12. The support rod 14 is rotated by a driving motor 18a through a screw 18b and a number member 18c, and the support plate 15 and the support wire 16 are moved forward by each link 17 to swell a back pad 10b forward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back support device for a vehicle seat such as a pelvis support and a lumbar support.

[0002]

2. Description of the Related Art A back support device for a vehicle seat is
It is commonly known as lumbar support. The lumbar support is published in the publication "Automotive Engineering Handbook 6
Pp. 1-25 (published on September 30, 1983 by the Society of Automotive Engineers of Japan) ”, a torsion bar spring whose base end is rotatably supported in the front-rear direction by a back frame. The configuration is provided with a pressing plate assembled to the tip end portion of the torsion bar spring and a drive motor for rotating the torsion bar spring in the front-rear direction. In the lumbar support, if necessary, the torsion bar spring is rotated forward by rotating the drive motor forward, the pressing plate is moved forward to press the back of the occupant, and the rotation of the drive motor is reversed to rotate the torsion bar spring. The bar spring is pivoted rearward, and the pressing plate is moved backward to function so as to cancel the pressing on the back of the seated person.

[0003]

In the lumbar support, since the pressing plate is completely independent of each spring member of the back frame which constitutes the seat back, the torsion bar spring is moved forward. When the pressing plate is rotated and moved forward, only the portion of the back pad with which the pressing plate abuts bulges forward to give the seated person an uncomfortable feeling, and the seat back of the seated person does not touch the back of the seated person. The entire surface is difficult to fit, and depending on the occupant, fatigue may be felt.

An object of the present invention is to provide a back frame of a seat back which constitutes a vehicle seat with a rectangular frame body and elastically deform in the front-rear direction by tensioning each frame portion with each end fixed. Focusing on a vehicle seat having a configuration including a plurality of spring members, the above problems can be solved.

[0005]

SUMMARY OF THE INVENTION The present invention is provided with a seat back which is connected to a rear portion of a seat cushion at its lower end and stands upright. The back frame of the seat back has a rectangular frame body and each frame of the frame body. A back support device in a vehicle seat, comprising a plurality of spring members that are fixedly stretched at their ends and elastically deformed in the front-rear direction. A rod that is rotatably supported in the left-right direction and that extends in the left-right direction, a support plate that is connected to the center of the rod through a link that advances and retracts in the front-rear direction, and extends in the left-right direction, and is fixed to the upper end of the support plate And a support wire that extends upward and is supported by each of the spring members, and an actuator that rotates the rod forward and backward to move the support plate forward and backward. Than it is. The supporting device functions as a pervis support when it is arranged at a lower position with respect to the seat back, and functions as a lumbar support when it is arranged at a higher position than this.

[0006]

In the back support device having such a structure, the rod is rotated forward and backward by the operation of the actuator to bend and extend the link in the front-rear direction. When the actuator is not operated, the link is in a bent state. The support plate and the support wire are located close to each spring member. When the actuator is operated in this state, the rod rotates to extend the link forward and move the support plate and support wire forward,
The back pad is bulged forward and compressed and deformed. The deformation of the back pad gradually increases in the downward direction between the upper end of the support wire and the support plate. Further, when the actuator is switched and operated in this state, the rod rotates in the reverse direction to bend the link, and the support plate and the support wire are moved rearward to restore the back pad to the original state.

As described above, according to the back support device,
The support plate and the support wire are integrally moved forward so that the forward bulge amount of the back pad between the upper end of the support wire and the support plate is gradually increased downward. Since the back pad of the seat bulges locally to the front and the entire back pad also deforms following this, there is no discomfort to the seated person, and the seat back is seated against the back of the seated person. The entire surface of the seat fits easily, and the feeling of fatigue for the seated person can be largely eliminated.

The supporting device functions as a pervis support when it is arranged at a lower position with respect to the seat back, and functions as a lumbar support when it is arranged at a higher position than this. .

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A back support device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a vehicle seat equipped with the back support device according to the present invention. 2 is a perspective view showing a disassembled seat back constituting the vehicle seat. In the vehicle seat, a seat back 10, a seat cushion 20,
A headrest 30 is provided. The seat back 10 is assembled to the rear portion of the seat cushion 20 at its lower portion so as to be rotatable in the front-rear direction via a reclining mechanism, and the headrest 30 is assembled to the top portion of the seat back 10 so that the position of the seat back 10 can be adjusted in the vertical direction. It is attached.

The seat back 10 is shown in FIGS. 2, 5 and 6.
As shown in, the back frame 10a, the back pad 1
0b, the backboard 10c, and the back cover 10d, the backboard 10c is provided at the rear part of the back frame 10a, and the back pad 10b is provided at the front part.
It is constituted by covering the whole with.

As shown in FIGS. 2 and 3, the back frame 10a comprises a frame body 11 formed of a pipe, a plurality of S springs 12, and pad receiving wires 13, and each S
The spring 12 has its end portions on the left and right side frame portions 11 of the frame body 11.
It is fixed to a and 11b, and both side frame parts 11a and 11b
It extends in the left-right direction. Each pad receiving wire 13 is fixed to each side frame portion 11a, 11b of the frame body 11 or another pad receiving wire, and receives the back pad 10b together with each S spring 12. The back frame 10a is provided with a pelvis support 10e which is an example of a back support device according to the present invention. As shown in FIGS. 3 and 4, the pelvis support 10e includes a support rod 14, a support plate 15, a support wire 16, a pair of links 17, and an actuator 18.

The support rods 14 constituting the pervis support 10e are provided with side walls 11 of the frame 11 at their ends.
The lower ends of a and 11b are rotatably supported in the front-rear direction and extend in the left-right direction. The support plate 15 is a frame body 11.
The length of the rectangular support wire 16 is slightly shorter than the left and right width of the, and the vertical width is shorter than the left and right length, and the lower end of the gate-shaped support wire 16 is fixed to the upper edge of the rectangular wire. Has been done. Each link 1 is provided on the rear side of the support plate 15.
The front end of 7 is rotatably connected, and the rear end of each link 17 is rotatably connected to the support rod 14. In this state, the support wire 16 is fixed to each S spring 12, and the support plate 15 is provided on each side frame portion 11 of the frame body 11.
It is supported by a and 11b and each S spring 12.

The actuator 18 is a drive motor 18a,
It is composed of a screw 18b and a nut member 18c. The drive motor 18a is fixed to the bracket 18d, and is fixed to the lower frame portion 11c by hooking the bracket 18d to the lower frame portion 11c of the frame body 11. Further, the nut member 18c has a bracket 18 at each end thereof.
rotatably supported by the bracket e, and the bracket 18e
Is rotatably connected to the arm portions 14a and 14b of the support rod 14. The screw 18b is the drive motor 1
In the state of meshing with the output gear 8a, the nut member 18c is threaded through the central portion of the nut member 18c so as to be able to move forward and backward. The drive motor 18a is configured to rotate in the forward and reverse directions by operating a seesaw-type switch 18f provided on a side portion of the seat cushion 20. Reference numeral 18g is a stopper provided in the middle portion of the screw 18b, reference numeral 18h is a stopper nut screwed to the lower end portion of the screw 18b, and the nut member 18c advances and retracts between the two as much as possible.

In the seat back 10 having the pelvis support 10e having such a structure, the pelvis support 1
When 0e is not in operation, the state is as shown in FIG. That is,
Each of the links 17 constituting the pelvis support 10e bends and extends in the front-rear direction by the forward and reverse rotations of the support rod 14, and is in a bent state when the support plate 1 is not operating.
5 and the support wire 16 are located close to the respective S springs 12 and the pad receiving wires 13. In this state,
When the drive motor 18a is driven in the normal direction by operating the switch 18f, the screw 18b rotates in the normal direction and the nut member 18
c is moved downward along the screw 18b, and the support rod 14 is rotated clockwise in FIG. As a result, as shown in FIG. 6, each link 17 extends forward to move the support plate 15 and the support wire 16 forward, so that the back pad 10b bulges forward and is compressed and deformed. The deformation of the back pad 10b is
The distance between the upper end of the support wire 16 and the support plate 15 gradually increases downward.

When the switch 18f is switched in this state, the drive motor 18a is driven in the reverse direction, the screw 18b is rotated in the reverse direction, and the nut member 18c is moved to the screw 18c.
It is moved upward along b and the support rod 14 is rotated counterclockwise in the drawing. As a result, each link 17 is shown in FIG.
As shown in FIG. 5, the support plate 15 and the support wire 16 are bent backward to move the support plate 15 and the support wire 16 rearward to restore the original state.

Thus, the pervis support 10e concerned
According to the support plate 15 and the support wire 16
Are integrally moved forward so that the back pad 10b gradually bulges forward along the downward direction between the upper end of the support wire 16 and the support plate 15, so that when the pelvis support 10e operates. The seated person does not feel uncomfortable, and the entire surface of the seatback 10 easily fits against the back of the seated person, so that the seated person's fatigue can be largely eliminated.

In the present embodiment, an example of the pelvis support 10e has been described as the back support device according to the present invention, but a device configured in the same manner as the pelvis support 10e is higher than the installation position in the embodiment. If it is placed on the waist, it will function as a lumbar support.

[Brief description of drawings]

FIG. 1 is a perspective view of a vehicle seat equipped with a pelvis support that is an example of a back support device according to the present invention.

FIG. 2 is an exploded perspective view of a seat back constituting the seat, FIG. 2 (a) is a back frame, FIG. 2 (b) is a back pad, FIG. 2 (c) is a back board, and FIG. FIG. 3 is a perspective view showing a back cover, respectively.

FIG. 3 is a perspective view of a back frame assembled with the same pelvis support.

FIG. 4 is an exploded perspective view of the pelvis support seen from the rear side.

FIG. 5 is a vertical sectional side view of the seat back when the pelvis support is in a non-operating state.

FIG. 6 is a vertical sectional side view of the seat back when the pelvis support is in an operating state.

[Explanation of symbols]

10 ... Seat back, 10a ... Back frame, 10b
... back pad, 10c ... back board, 10d ... back cover, 10e ... pervis support, 11 ... frame body, 1
2 ... S spring, 14 ... support rod, 15 ... support plate,
16 ... Support wire, 17 ... Link, 18 ... Actuator, 18a ... Drive motor, 18b Screw, 18
c ... nut member, 20 ... seat cushion, 30 ... headrest.

Claims (1)

[Claims] 1. A seat back having a lower end connected to a rear portion of a seat cushion and standing upright, wherein a back frame of the seat back has a rectangular frame and each end fixed to each frame of the frame. A back support device for a vehicle seat, which is provided with a plurality of spring members that are stretched and elastically deformed in the front-rear direction, wherein each end is rotatably supported in the front-rear direction by each frame portion of the back frame. A rod extending in the direction
A support plate that is connected to the center of the rod through a link that advances and retracts in the front-rear direction and extends in the left-right direction; and a support wire that is fixed to the upper end of the support plate and extends upward and is supported by the spring members. A back support device for a vehicle seat, comprising: an actuator that rotates the rod forward and backward to move the support plate forward and backward.