JP4023720B2 - Vehicle seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foldable vehicle seat that can be folded and housed smoothly without interfering with a body of a seat cushion.
[0002]
[Prior art]
Recently, with the development of outdoor sports such as fishing and camping, wagon type and one box type cars have come to be used more frequently than conventional sedan type cars. Further, some of these automobiles have been proposed in which a seat can be deformed into various shapes so that a large load can be placed. For example, as shown in FIG. 6, a seat back 30a is attached to a seat cushion 30b. When the seat cushion 30b is moved forward toward the seat surface, the seat cushion 30b moves rearward and the seat back 30a is folded on the seat back 30a so that the back surface of the seat back 30a becomes a load floor surface following the rear deck 31. ing. Reference numeral 35 denotes a rotatable link for connecting the seat cushion 30b and the body 32.
[0003]
However, the conventional one is a mechanism in which the seat back 30a rotates around the support pin 33a at the tip of the support member 33 erected on the body 32, and is pivotally supported by the pin 34 in front of the lower end of the seat back 30a. Since the rear portion of the seat cushion 30b performs an arc motion around the support pin 33a, the rear lower surface of the seat cushion 30b hits the body 32 as shown in FIG. 6B. As a result, in order to avoid this, the thickness of the cushion must be reduced, and there is a problem that the cushioning property is remarkably impaired. Furthermore, as shown in FIG. 6 (c), the seat back 30a jumps forward greatly after the front-down position, so it is necessary to secure a large space in the front part of the seat. There is also a problem that various restrictions are imposed on the size and the mounting position.
[0004]
[Problems to be solved by the invention]
The present invention solves the conventional problems as described above, and can fold and store the seat cushion smoothly without interfering with the body even if the seat cushion is sufficiently thick. The present invention has been completed for the purpose of providing a foldable vehicle seat that can be folded and stored compactly without popping out and exhibit both excellent cushioning properties and storage properties.
[0005]
[Means for Solving the Problems]
In the vehicle seat of the present invention made to solve the above problems, when the seat back is tilted forward toward the seat cushion seat surface, the seat cushion moves rearward and the seat back is folded on the seat cushion. In a vehicle seat in which the back surface of the back is a load floor surface following the rear deck, the rear portion of the seat cushion is pivotally supported on the front side of the lower end of the seat back, and the front portion of the seat cushion is supported on the base portion on the body side. The lower portion of the seat back is supported by a third link that pivots freely around the center, and the lower portion of the seat back is moved rearward in conjunction with the forward tilt of the seat back. The pivot link between the two link seat backs is lower than the pivot link between the first link and the seat back, and the pivot link between the second link and the body is the first link. In the links and high positions is behind the pivot point of the body, yet the positional relationship of the pivot point of the pivot portion of the second link and the seat back first link and the seat back, the former in the seating state The pivot part is located below the pivot part in the front-rear direction at substantially the same position, and the former pivot part is positioned rearward and upward relative to the latter pivot part in the retracted state. The two links of the first link and the second link are connected to the body so that the rear part of the seat cushion moves while drawing a trajectory that becomes almost horizontal after slowly descending to the rear side by the forward tilt of the seat back. It is characterized by that.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
In the figure, reference numeral 1 denotes a seat body comprising a seat back 1a and a seat cushion 1b. When the seat back 1a is tilted forward toward the seating surface of the seat cushion 1b, the seat cushion 1b moves rearward and the seat back 1a The seat back 1a is a foldable type in which the back surface of the seat back 1a becomes a load floor surface following the rear deck 21.
[0007]
A rear portion of the seat cushion 1b is pivotally supported via an L-shaped connecting member 2 on the front side of the lower end of the seat back 1a. The connecting member 2 is in a fixed state on the seat back side, and on the other hand, the seat cushion side is pivotally attached to the pivot part 11a by a pin or the like. Further, the front portion of the seat cushion 1b is supported so as to be swingable through a third link 3c that freely rotates around a base portion on the body side. In addition, 11b is a pivot part between the third link 3c and the body 22, and 11c is a pivot part between the third link 3c and the seat cushion 1b.
[0008]
The lower part of the seat back 1a is connected to the body 22 by two links of the first link 3a and the second link 3b, and the lower part of the seat back 1a is rearward in conjunction with the forward tilt of the seat back 1a. It is configured to move to the side.
That is, the first link 3a and the second link 3b are connected to the body via a plate-like bracket 4 erected on the body 22, and the first link 3a and the pivot portion 11d of the body 22 and the first link 3a Forming a limited chain with four points of the pivoting part 11e of the seat back 1a, the second link 3b and the pivoting part 11f of the body 22 and the second link 3b and the pivoting part 11g of the seat back 1a as an even number Yes.
[0009]
The second link 3b of the second link 3a is located at a position where the pivoting portion 11g with the seat back 1a is lower than the pivoting portion 11e of the first link 3a and the seat back 1a, and is pivoted with the body. When the seat back 1a is moved forward by setting the portion 11f at a position higher on the rear side than the first link 3a and the pivoting portion 11d of the body, the pivoting portions 11e and 11g move in an arc (see FIG. 1). It is configured so that the lower part of the seat back 1a moves rearward by rotating rearwardly (see the middle curve B and the curve C).
As a result, when the seat back 1a is moved forward, the pivoting portion 11a of the seat cushion 1b moves while drawing a substantially horizontal trajectory after slowly descending to the rear side, as shown by a curve A in FIG. Thus, since it is not a simple arc motion as in the prior art, it is possible to avoid the rear portion from interfering with the body 22 even if the seat cushion 1b is sufficiently thick.
[0010]
As shown in FIG. 2, the structure configured as described above is usually used as a seat with a seating surface formed, and when the seat back 1a is tilted forward toward the seating surface of the seat cushion 1b, FIG. As shown in FIG. 2, the seat cushion 1b moves rearward and the seat back 1a is folded on the seat back 1a so that the back surface of the seat back 1a forms a cargo floor surface that continues to the rear deck 21 to store a large luggage or the like. This is basically the same as a conventional foldable sheet of this type.
[0011]
In the present invention, the lower part of the seat back 1a is connected to the body 22 by two links of the first link 3a and the second link 3b. In conjunction with this, the lower part of the seat back 1a moves rearward.
That is, as shown in FIGS. 3 to 5, when the seat back 1a is tilted forward, the L-shaped connecting member 2 rotates counterclockwise together with the seat back 1a, but the first link 3a is not a simple rotational motion. And it will move by being regulated by the second link 3b. That is, when the first link 3a and the second link 3b rotate and move rearward (clockwise) around the pivoting portion 11d and the pivoting portion 11f, the connecting member 2 performs the movement restricted by these links. Will be done. As a result, the pivoting portion 11a of the connecting member 2 with the seat cushion 1b draws a trajectory that is substantially horizontal after descending slowly to the rear side as shown by the curve A (see FIG. 1) instead of a simple arc motion. Accordingly, the rear lower surface of the seat cushion 1b is completely stored in a predetermined position without hitting the body 22.
[0012]
As described above, the seat cushion 1b can be stored at a predetermined position only by a simple operation of moving the seat back 1a forward toward the seating surface of the seat cushion 1b, and the seat cushion 1b can be prevented from hitting the body 22. Since it moves, the cushion thickness can be made sufficiently thick. Further, since the center of rotation moves to the rear side when the seat back 1a is moved forward, the end portion of the seat back 1a does not jump out to the front side after folding, and a large space is secured on the front side. Since this is not necessary, the degree of freedom in seat design can be greatly increased.
[0013]
【The invention's effect】
As is clear from the above description, the present invention allows the seat cushion to be folded and stored smoothly without interfering with the body even when the thickness of the seat cushion is sufficient, and the seat back greatly jumps forward even after being tilted forward. It can be folded and stored compactly, and can exhibit both excellent cushioning properties and storage properties.
Therefore, the present invention contributes greatly to the development of the industry as a vehicle seat that eliminates the conventional problems.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of the present invention.
FIG. 2 is a front view showing a normal state of a sheet.
FIG. 3 is a front view showing a state in the middle of folding the sheet.
FIG. 4 is a front view showing a state in the middle of folding the sheet.
FIG. 5 is a front view showing a state in which the sheet is completely folded.
6A is a front view showing a normal state, FIG. 6B is a front view showing a state in the middle of folding, and FIG. 6C is a front view showing a folded state;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seat main body 1a Seat back 1b Seat cushion 2 L-shaped connection member 3a 1st link 3b 2nd link 3c 3rd link 4 Plate-shaped bracket 11a Pivot part 11d Pivot part 11e Pivot part 11f Pivot part 11g Pivot Wearing part 21 Rear deck 22 Body

Claims (1)

In the vehicle seat in which when the seat back is tilted forward toward the seat surface of the seat cushion, the seat cushion moves to the rear side and the seat back is folded on the back so that the back surface of the seat back is a load floor surface following the rear deck. The rear part of the seat cushion is pivotally supported on the front side of the lower end of the seat back, and the front part of the seat cushion is swingably supported via a third link that rotates freely around the base part on the body side. The lower portion of the seat back is moved in the backward direction in conjunction with the forward movement of the seat back, and the pivotal portion of the second link with the seat back is connected to the first link and the seat back. The pivot link between the second link and the body is higher than the pivot link between the first link and the body. Substantially the same position in the longitudinal direction the positional relationship of the pivot point of the pivot portion of the second link and the seat back first link and the seat back, with respect to pivot point pivot portion of the former is the latter in the seating state In the retracted state, the former is attached to the body by two links, a first link and a second link, so that the former pivot part is located behind and above the latter pivot part. A vehicle seat characterized in that the rear part of the seat cushion moves while drawing a substantially horizontal track after gently descending to the rear side by a forward tilt of the seat back.

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