JPH0690836A - Seat device - Google Patents

Abstract

PURPOSE:To give a fit feeling to a sitter and provide the shape of sitting surface hardly tiring the sitter by operatively bulging the lower part of a seat back to be adapted to the sitting position of the sitter in his relaxed position. CONSTITUTION:A lower support body 11 having the lower end side supported movably by a lower shaft 10 is disposed in the lower part of a seat back 3. An upper support body 14 connected pivotably to the lower support 11 and having the upper end side supported movably by an upper shaft 13 is disposed in the lower part of the seat back 3. While both support bodies are operatively moved back and forth of the seat by the external operation, a pressing means 15 is provided to maintain the locking condition at a predetermined operational position. The upper shaft is pivotably supported by a seat back frame 20 and the lower shaft 10 has the shaft support part 10a erected in the nearly L-shaped form and pivoted in a position of the frame side part higher than an upper shaft support part 13a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat device such as a relaxing seat in which a seat back can be reclined with respect to a seat cushion, and more particularly to a seat occupant depending on a seat reclining posture or a seated occupant's sitting posture. The present invention relates to a seat device provided with a support mechanism below the seat back, which provides a seated person with an appropriate sitting comfort by selectively supporting the waist and the like from the back side.

[0002]

2. Description of the Related Art For example, in a vehicle seat, it is desired that a seated person is stably held to give a proper sitting comfort and fatigue can be reduced as much as possible even when sitting for a long time. Further, it is desired to have a structure in which the cushioning property, the holding property and the like can be appropriately changed according to the seated person's body shape and preference, and further the sitting posture, etc. Things are conventionally known.

[0003]

In this type of vehicle seat, the seat back may be tilted rearward to some extent to allow the seated person to sit in a relaxed posture. The weight of the vehicle is mainly supported on the rear end side of the seat cushion, but is also supported on the contact surface with the lower end side of the seat back, so that a stable sitting posture cannot be secured.

Particularly, when the angle of the seat back with respect to the seat cushion becomes large, the seated person is in a supine state, and the lumbar region thereof tends to move toward the front of the seat cushion, and the seat back causes a feeling of pressure above the seated person's back. On the contrary, the support force to the waist becomes weaker, and especially when the waist is seated at the advanced position, a gap is created between the seat cushion and the back of the seat at the intersection of the seat back, and the relaxed posture is stabilized. Becomes difficult to hold.

[0005] Such a problem is that when the driver's seat and the passenger's seat are separate type seats which are configured by bucket seats, these two seats determine the driving posture of the driver in the driver's seat. Since it is formed as a reference, there arises a problem that the passenger's seat has a bad seating comfort in a relaxed posture.

That is, when a seated person on the passenger side seat is seated in a relaxed posture by tilting the seat back to the back side, the waist moves to the front of the seat cushion and a gap is formed between the seat back and the lower part. Therefore, the fitting feeling in this portion is lacking, and the back of the seated person partially hits against the seat back to be supported, so that the surface pressure and the feeling of pressure are increased and the tired person is easily tired.

For this reason, the seat back should be replaced with the actual public sho 60-3.
As shown in Japanese Patent No. 1547 etc., there is also known a sheet having a center-fold structure in which the upper and lower sheet members are connected to each other in a bendable state through a hinge portion and are configured by being divided into two parts. It is also known that an attempt is made to secure a stable supporting state by eliminating as much space as possible on the back side of the waist of a seated person when sitting in a relaxed posture.

However, in such a conventional seat, when the upper part of the seat back is tilted forward, the back is rounded, so-called cat-like tendency is felt, and the abdominal part feels a feeling of pressure and cannot relax. is there.

Further, according to the above-mentioned vertically divided seat back, there is a problem that it is difficult to finely adjust the seat back upper part and the seat back lower part by alternately moving and adjusting them to adapt to the seating posture. It is desirable to take some measures to eliminate such problems.

The present invention has been made in view of the above circumstances, and provides a seated person in a relaxed posture,
An object of the present invention is to provide a seat device that gives a fit feeling, can easily and appropriately secure a stable holding state, eliminates a local pressure feeling, improves a sitting comfort, and can maintain a seated state in which fatigue does not occur.

[0011]

In order to meet such a demand, a seat device according to the present invention is a lower part which is arranged inside a lower part of a seat back and whose lower end side is supported by a lower shaft so as to be movable in the seat longitudinal direction. A support body, an upper support body disposed inside the lower part of the seat back and rotatably connected to the upper end portion of the lower support body, and the upper end side supported by an upper shaft so as to be movable in the seat front-rear direction; The lower support body and the upper support body are provided with pressing means for moving the lower support body and the upper support body in the seat front-rear direction, and the upper shaft is rotatably supported on both sides of the seat back frame and is substantially L in the lower shaft. Make sure that the shaft support that rises in a letter shape is more seated than the seat support than the upper shaft support. The lower shaft is pivotally supported on both sides of the frame, and a part of the lower shaft is pressed by the pressing means in the seat front-rear direction so that the lower support body and the upper support body operate in conjunction with this. It is configured in.

[0012]

According to the present invention, the upper support body and the lower support body, which are arranged to be connected to each other on the lower side of the seat back, are relatively moved by the rotating force to the lower shaft due to the external operation. By moving the seat back and forth while rotating it, it is possible to obtain a seat back shape that fits the seated person in a relaxed posture, etc., which improves the fit for the seated person and the feeling of sitting. Will be better and less tired.

[0013]

1 to 8 show an embodiment of a seat device according to the present invention. In these drawings, the case where the present embodiment is a vehicle seat will be described. First, as is clear from FIGS. 8 (a) and 8 (b), a vehicle seat generally designated by reference numeral 1 is composed of a seat cushion 2 and a seat back 3 standing upright on its rear end side. . Further, reference numeral 5 in the drawing denotes a seated person on the seat 1.

In this embodiment, a well-known headrest 4 is attached to the upper end of the seat back 3, and as is well known, a reclining mechanism including a base and an arm rotatably supported by the base (see FIG. It is connected and supported to the seat cushion 2 side via a not-shown), and is configured to be displaceable between a normal state shown in FIG. 8A and a reclining state shown in FIG. Here, as the reclining mechanism, a reclining device operated manually,
It may be a power reclining device using an electric motor or a double-sided device having device portions on both sides of the seat.

Now, according to the seat device of the present invention,
As is apparent from FIGS. 1 to 7, a lower panel 11 as a lower support body, which is disposed inside the lower portion of the seat back 3 and whose lower end side is movably supported in the front-rear direction of the seat 1 by a lower shaft 10, and a seat. Back 3
Upper panel as an upper support body that is disposed inside the lower part of the lower panel and is rotatably connected to the upper end portion of the lower panel by a shaft support portion and has the upper end side movably supported in the seat front-rear direction by an upper shaft. 14 and these lower and upper panels 11,
The cam 15 serves as a pressing unit that rotates the seat 14 in the front-rear direction of the seat 1 by an external operation.

The upper shaft 13 is rotatably supported by both side portions 20a, 20a of the seat back frame 20, and the lower shaft 10 is
A shaft supporting portion 10a which is formed in a substantially L-shape is rotatably supported at a position above both side portions 20a, 20a of the seatback frame 20 with respect to the shaft supporting portion 13a of the upper shaft 13, and is also a part of the lower shaft 10. Portion (cam receiving plate 16 provided on one rising portion 10b)
The cam 15 is configured to be pressed in the seat front-rear direction.

Here, the lower and upper panels 1
As is apparent from FIGS. 1 and 3, both side portions 11a and 14a of the first and the first portions 14 and 16 are bent and formed toward the front of the seat 1, thereby holding the seated person 5 from both sides and holding in the lateral direction. Can be increased.

The seat back 3 is shown in FIGS. 1, 2 and 6.
Etc., the frame-shaped side portions 20a, 20
a, a seat back frame 2 including a plurality of frame shafts 20b, a seat spring 20c, and the like
0 and the seat back pad 21 arranged on the front side thereof
As is well known, the trim 21a covers the front surface of the seat back frame 20 and the back garnish 22 that covers the seat back frame 20 from the back side.

Further, in this embodiment, the lower portion of the seat back pad 21 constituting the seat back 3 is shown in FIGS.
As is clear from (a) and (b), the notch 23 from the seat surface is partially pressed in the seat front-rear direction to be displaced. In addition, 2 in the figure
Reference numeral 4 is a hook for connecting and fixing the pad 21 to each of the panels 11 and 14.

Further, as is apparent from FIGS. 1 and 4 to 6, the cam 15 has an inner side of a shaft 27 pivotally supported by a bracket 26 on one side portion 20a of the seatback frame 20. This shaft 27 is provided at the end,
The cam receiving plate 1 is moved by the cam 15 by being rotated by the operation lever 28 provided at the outer end thereof.
The pressing force on 6 can be selectively applied.

According to such a structure, the seat back 3
The lower side portions 3a and 3b are pressing forces that the upper panel 14 and the lower panel 11, which are arranged to be connected to each other, act on the operation lever 28 by the rotation of the cam 15 accompanying the external operation, By rotating the lower shaft 10, as is clear from FIGS. 8A and 8B, the lower shaft 10 is moved in the seat front-rear direction while relatively rotating.

As a result, it is possible to obtain a shape of the seat back 3 that fits the seated person 5 in a relaxed posture, etc., thereby improving the fit for the seated person 5 and localizing the seated person 5. The increase in surface pressure can be adjusted, which improves the sitting comfort and reduces fatigue.

Further, in the seat 1 having such a structure,
After deciding the tilting position on the upper end side of the seat back 3, it is possible to adjust the bulging amount of the lower side parts 3a, 3b and the deformation amount into a substantially doglegged shape, so that operability is excellent and fine adjustment can be performed. It And in such a structure, the seat back lower part 3a,
Even if 3b is swollen, the viewpoint of the seated person 5 does not change, repeated operations for adjustment are not necessary, and the swollen amount can be adjusted to a desired fit.

Further, even if the lower portions 3a and 3b of the seat back are expanded, both side portions 11a and 1 of the respective panels 11 and 14 are bulged.
The holdability of the seated person 5 can be secured by the 4a.

Here, in the above-mentioned embodiment, as is clear from FIG. 1 etc., the cam 15 has a rectangular shape, and when it is stopped at an arbitrary operating position, it receives a seated person in a predetermined state, and The state is kept in a locked state. However, the present invention is not limited to this, and it goes without saying that a lock means for locking the shaft 27 having the cam 15 at an arbitrary angular position may be additionally provided.

The movement of the lower shaft 10 of the lower panel 11 and the upper panel 14 provided at the lower portion of the seat back having the above-described structure due to the rotational movement of the lower shaft 10 is shown in FIG. 9, and its details will be easily understood. Here, it is clear that the lower shaft 10 has a positional relationship in which the shaft support portion 10a is located above the shaft support portion 13a of the upper shaft 13 but does not interfere with each other.

Here, in the above-described embodiment, each panel 1
Although the case where the dimensions of the height directions of 1 and 14 are set to be substantially equal to each other is shown, the present invention is not limited to this and, for example, as shown in FIG. 10, the lengths of the lower panel 11 and the upper panel 14 are the same. It goes without saying that the dimensions may be changed. In this way, the seat back lower portions 3a, 3b
The amount of bulging and the deformed shape in the above-mentioned item change arbitrarily.

The present invention is not limited to the structure of the above-described embodiment, but the shape of each part of the vehicle seat 1 as a seat device,
The structure and the like can be freely modified and changed as necessary, and various modifications can be considered.

For example, FIG. 11 shows a lower support body 30.
Further, as the upper support body 31, instead of the panels 11 and 14, an S-shaped spring is used. This is advantageous when the thickness of the pad cannot be secured in the panel. In addition, reference numeral 32 in the drawing denotes a side portion which is bent and formed in the front of the seat to maintain a holding property.

Further, although the cam 15 is used as the pressing means for rotating the lower shaft 10 in accordance with the external operation in the above-mentioned embodiment, the present invention is not limited to this.
Needless to say, various pressing means may be used, and conventionally known means such as a pressing pin and a pressing lever may be adopted. Of course, an appropriate locking means may be attached if necessary. Attaching such a locking means has an advantage that the fine adjustment of the extrusion amount can be easily performed.

Further, the seat device 10 according to the present invention is not limited to the vehicle seat 1 as described above, but any seat device can be used as long as the seat back 3 is configured to perform a reclining operation or the like. It can be applied to exert the effect.

[0032]

As described above, according to the seat apparatus according to the present invention, the lower support inside the lower seat back is supported by the lower shaft so as to be movable in the seat front-rear direction, and the inner lower seat back. An upper support body that is rotatably connected to the upper end portion of the lower support body and whose upper end side is movably supported in the seat front-rear direction by an upper shaft, and the lower support body and the upper support body are seated by an external operation. The upper shaft is rotatably supported on both sides of the seat back frame, and the lower shaft has a substantially L-shaped upright support. The shaft is supported at a position above both sides of the seat back frame rather than the shaft support, and A part of the shaft is moved in the seat front-rear direction by the pressing means, and in conjunction with this, the lower support body and the upper support body are operated in conjunction with each other. The upper and lower support bodies that are placed underneath in the back are moved in the seat front-rear direction while relatively rotating by the pressing force associated with the external operation of the lower shaft. It has various excellent effects of improving the fit to the seated person, making the seating surface into a required shape to prevent fatigue, and improving the sitting comfort.

Further, according to the present invention, there is an advantage that the holding property by the seat back can be enhanced and the above-mentioned effect can be further exerted.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view showing a main part configuration showing an embodiment of a seat back structure in a seat device according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a schematic perspective view seen from the direction of arrow IV in FIG.

FIG. 5 is an enlarged cross-sectional view of a rotation operation unit of a cam as a pressing unit.

FIG. 6 is a schematic exploded perspective view of the entire seat back according to the present invention.

FIG. 7 is a schematic configuration of a seat back pad (a),
Sectional drawing shown in (b).

FIG. 8 is a side view showing a schematic configuration of the entire seat device in a normal state and a reclining state according to (a) and (b).

FIG. 9 is an operation explanatory view for explaining the operation principle of the present invention.

FIG. 10 is an operation explanatory view similar to FIG. 9 showing a modified example of the present invention.

FIG. 11 is a schematic perspective view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle seat 3 Seat back 3a Lower part 3b Lower part 5 Seated person 10 Lower shaft 10a Axial support 11 Lower panel (lower support body) 12 Axial support 13 Upper shaft 13a Axial support 14 Upper panel (upper support) 15 Cam (pressing means) 20 Seat back frame 21 Seat back pad 28 Operating lever 30 S-shaped spring (lower support body) 31 S-shaped spring (upper support body)

Claims (2)

[Claims] 1. A lower support body disposed inside a lower portion of a seat back and having a lower end side movably supported in a front-rear direction of a seat by a lower shaft, and an upper end of the lower support body disposed inside a lower portion of the seat back. Upper support body that is rotatably connected to the seat and the upper end of which is supported by an upper shaft so as to be movable in the seat front-rear direction, and the lower support body and the upper support body rotate in the seat front-rear direction by an external operation. The upper shaft is rotatably supported on both sides of the seat back frame, and the lower shaft has a shaft supporting portion formed in a substantially L-shape. The upper shaft is rotatably supported at a position above both side portions of the seat back frame with respect to the rotatably supporting portion, and A seat device, wherein a part of a lower shaft is configured to be pressed in the seat front-rear direction by the pressing means. 2. The seat device according to claim 1, wherein both sides of the lower support body and the upper support body are bent toward the front of the seat.