JP4501698B2 - Hardness variable vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat of a variable hardness type that can ensure a comfortable sitting comfort according to the physique of a seated person.

  2. Description of the Related Art Conventionally, automobile seats that incorporate a mechanism called a lifter that adjusts the seat cushion height of a seat cushion are known so that the field of view can be secured according to the height of the seated person. As shown in Patent Document 1, the lifter mechanism includes a front link that rotatably connects the front formation portion of the seat cushion frame and the floor fixing member, a rear formation portion of the seat cushion frame, and the floor fixing member. It consists of a rear link that is pivotably connected, and is configured to move the seat cushion frame up and down by rotating these front and rear links.

  On the other hand, as shown in Patent Document 2, a spring material called an S spring is stretched on the lower surface of the seat cushion. The S spring has a front end fixed to the seat cushion frame and a rear end fixed to a rod connecting the left and right rear links, and ensures a comfortable seating comfort by receiving the load of the seated person. Yes. In this case, as described above, the tension of the S spring is generally designed so that a person with a physique of the design standard is most comfortable to sit between the seat cushion frame and the rod. When the lifter is operated, the rod and the seat cushion frame move by the same amount, so that the tension of the S spring always keeps a value that matches the design standard person.

However, the physique of the seated person is different, and the amount of deflection (initial load) of the S spring differs between a heavy person and a light person, so if the S spring is always at a constant tension, On the other hand, it was impossible to ensure a comfortable sitting comfort. As a result, there is a problem that a person with a heavy body weight or a person with a light weight, which is a physique other than the design standard, has to drive in a state of poor comfort.
JP 2002-142908 A Japanese Utility Model Publication No. 62-107751

  The present invention solves the conventional problems as described above, has a lifter mechanism, and can secure an optimum position where a good field of view can be obtained in accordance with the physique of the seated person. The present invention has been completed for the purpose of providing a vehicle seat of a variable hardness type that can ensure a comfortable sitting comfort according to the physique (particularly body weight) of a seated person.

In order to solve the above-described problems, the present invention provides a variable hardness vehicle seat having a lifter mechanism in which a front formation portion and a rear formation portion of a seat cushion frame are connected to a floor fixing member so as to be movable up and down. In the vehicle seat, the lifter mechanism includes a link mechanism that rotatably connects a seat cushion frame and a floor fixing member, and a side of the link mechanism that is connected to the seat cushion frame is transversely installed in the width direction. The rod is provided with an eccentric portion that shifts with the rotation of the link mechanism by shifting the axis, and one end of the elastic member in the vehicle front-rear direction is fixed to the eccentric portion, The elastic member is interposed between the front forming portion and the rear forming portion, and the elastic member has a small initial load at the upper position of the seat cushion frame, and the lower The position is characterized in that it is installed such initial load increases.

  In the variable hardness type vehicle seat of the present invention, the elastic member is interposed between the front forming portion and the rear forming portion of the seat cushion frame, and the elastic member has a small initial load at the upper position of the seat cushion frame, and the lower position. In the structure, the initial load is set so as to be large, and a good seating feeling can be obtained for a person of any physique from a small person to a large person.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
The drawings show a case in which the present invention is applied to a driver's seat side seat of an automobile seat. FIG. 1 is a perspective view, FIG. 2 is a front view thereof, and FIGS. In the figure, 1 is a seat cushion frame (a seat back frame is not shown), and 2 is a floor fixing member such as an upper rail. The seat also incorporates a lifter mechanism that adjusts the seat cushion height so that the field of view can be secured according to the height of the seated person.

  This lifter mechanism can adopt various types, and in the illustrated one shown as an example, a front link that rotatably connects the front forming portion of the seat cushion frame 1 and the floor fixing member 2. 3 and a rear link 4 that rotatably connects the rear forming portion of the seat cushion frame 1 and the floor fixing member 2. That is, the seat cushion frame 1 is pivoted about the pivot portion 3a that is the rotation center of the front link 3 and the pivot portion 4a that is the rotation center of the rear link 3 to lift the seat cushion frame 1 up. The structure is basically the same as a conventional lifter mechanism. In the figure, 3b is a pivoting portion between the front link 3 and the seat cushion frame 1, and 4b is a pivoting portion between the rear link 4 and the seat cushion frame 1.

In the present invention, the elastic member 10 is interposed between the front forming portion and the rear forming portion of the seat cushion frame 1, and the elastic member 10 has a small initial load at an upper position of the seat cushion frame 1 and an initial position at a lower position. It has a characteristic configuration in that it is installed so as to increase the load.
With such a configuration, the amount of flexure of the elastic member increases at the upper use position, which is the seat cushion position when a small person is seated, while the lower use is the seat cushion position when a large person is seated. In the position, the amount of deflection of the elastic member is small, and a good seating feeling can be always obtained no matter what physique a person is seated on.

More specifically, the lifter mechanism includes a link mechanism that rotatably connects the seat cushion frame 1 and the floor fixing member 2, and the side of the link mechanism that is connected to the seat cushion frame 1 crosses in the width direction. The rod 5 is installed. The rod 5 is provided with an eccentric portion 6 whose axis is displaced, and one end of the elastic member 10 in the vehicle front-rear direction is fixed to the eccentric portion 6. Yes.
With such a structure, as the seat cushion frame 1 moves up and down, the distance between the eccentric portion 6 and the front forming portion or the rear forming portion is changed, and the initial load of the interposed elastic member 10 is changed. Is possible with a simple structure.

This point will be further described in detail with reference to the drawings.
3 to 4 are explanatory views of operation, and FIG. 3 shows a state in which the lifter mechanism is lowered so that the seat position is at the lowermost position (at the time of lowermost, hereinafter referred to as L / M), and FIG. Shows a state in which the lifter mechanism is lifted so that becomes the uppermost part (at the time of uppermost, hereinafter referred to as U / M).
In the illustrated example, an eccentric portion 6 is provided that extends upward with the shaft center shifted from the rod 5 installed on the rear link 4. One end of the elastic member 10 in the vehicle rear direction is fixed to the eccentric portion 6. ing. On the other hand, one end of the elastic member 10 in the vehicle front direction is fixed to the front forming portion of the seat cushion frame 1. Here, as shown in FIG. 3, the linear distance between the front hooking portion and the rear hooking portion of the elastic member 10 at L / M is (L), and the elastic member 10 at U / M is shown in FIG. When the linear distance between the front hooking part and the rear hooking part is (L '), the front and rear links 3, 4 rotate around the pivoting parts 3a, 4a at U / M, and the seat cushion frame 1 rises. Then, since the relative position of the eccentric portion 6 with respect to the front hook portion changes, L> L ′. As a result, since the initial load of the elastic member 10 at the time of U / M becomes small and it becomes easy to bend, when a small person (a person with a light weight) sits down, it is sufficiently bent and exhibits excellent cushioning properties. Become.

As shown in the figure, the elastic member 10 is composed of a spring member 10a, and at least one end of the spring member 10a is inserted into a front forming portion, a rear forming portion, or an eccentric portion 6 via a sheet-like or mat-like pad receiving member 11. It can be fixed to.
Thus, by setting the spring member 10a in the vicinity of the front or rear end, it is preferable that when the seat pad is thinned, it is possible to eliminate the feeling of foreign matters when seated by the spring member 10a.

The eccentric part 6 is provided on the rear link 4, the spring member 10a is one or more coil springs, one end of the coil spring is directly fixed to the eccentric part, and the other end is a sheet-like or mat-like receiving part. It can be fixed to the front forming portion via the member 11.
By adopting such a structure, it is possible to obtain a good deflection feeling without foreign matter regardless of the thickness of the seat pad, and when the lifter mechanism is L / M, the coil spring is difficult to bend. Even when it is necessary to reduce the distance between the surface and the floor, it is possible to prevent the bottom surface of the seat from bottoming out on the floor when sitting .

5 to 8 show other embodiments. In this case, the S spring 10b is used as the spring member 10a, and the rear end of the S spring 10b is fixed to the eccentric part 6, while the front end of the S spring 10b is fixed to the front forming part of the seat cushion frame 1 and the S spring. The initial load of 10b is changed.
More specifically, as shown in FIG. 6 , a connecting rod 5 is integrally attached between the left and right rear links 4, and the rod 5 has an eccentric shaft center. The part 6 is provided. The eccentric portion 6 has a structure in which the rear end of the S spring 10b is fixed. Note that the front end, which is the other end of the S spring 10b, is fixed to the front forming portion of the seat cushion frame 1 as in the prior art.

The operation of the seat shown in FIG. 5 will be described below.
FIG. 8 is an operation explanatory diagram of the front and rear links 3, 4, the seat cushion frame 1, and the S spring 10 b when the lifter mechanism is operated. As shown in FIG. 7, when an operation lever (not shown) of the lifter mechanism is operated, the front and rear links 3 and 4 rotate about the pivot part 3a and the pivot part 4a, respectively, and the seat cushion frame 1 Moves up and down between the lower end position and the upper end position. On the other hand, a connecting rod 5 is integrally attached to the rear link 4, and the rod 5 is provided with an eccentric portion 6 whose axis is shifted. In addition, since the rear end of the S spring 10b is fixed, the length of the S spring 10b gradually decreases as the seat cushion frame 1 rises.
That is, the fixed portion of the S spring 10b in the front forming portion of the seat cushion frame 1 and the shaft center of the rod 5 are always kept at a constant distance during the up and down movement of the seat cushion frame 1, but the S spring 10b. As shown in FIG. 7 , the distance from the eccentric portion 6 that fixes the rear end of the rear end changes as L1>L2> L3 gradually as the seat cushion rises. As a result, as the seat cushion frame 1 is raised, the tension (tensile force) of the S spring 10b is weakened and the S spring 10b is easily bent.
In the illustrated example, the rod 5 is bent as the eccentric portion 6, but other pipes such as another pipe are welded or taped so as to shift the axis to the linear rod 5. It can also be added by processing.

FIG. 9 is a graph showing the relationship between the amount of deflection and the load. The curve S1 indicates the L / M time, and the curve S2 indicates the U / M time. For example, when the weight of the seated person is 70 kg and 40 kg, the loads applied to the S spring 10b are 490N and 294N, respectively. In this case, the curve S1 bends by 29.1 mm with respect to the load: 490N, but only 18.5 mm with respect to the load: 294N. On the other hand, when the seat cushion is lifted up and seated with the seat of the present invention, as will be understood from the curve S2, it will bend 22.3 mm with respect to the load: 294N. Will be able to flex and support well.
In addition, since the adjustment of the deflection amount of the S spring 10b can be adjusted by the angle of the eccentric portion 6, the eccentric amount, and the like, it can be arbitrarily designed according to the vehicle type, the purpose of use, and the like. .
Further, FIG. 8 is a graph showing the relationship between the deflection amount of the S spring and the load, but it goes without saying that the relationship between the deflection amount and the load is the same even with other elastic members.

As is clear from the above description, the vehicle seat of the present invention has a front link 3 that rotatably connects the front formation portion of the seat cushion frame 1 and the floor fixing member 2, and the rear formation of the seat cushion frame 1. A vehicle seat having a lifter mechanism comprising a rear link 4 that pivotably connects the portion and the floor fixing member 2, and an elastic member 10 is interposed between the front formation portion and the rear formation portion, The elastic member 10 has a structure in which the initial load is small at the upper position of the seat cushion frame 1 and the initial load is large at the lower position. When the lifter mechanism is operated to raise the seat cushion, the elastic member 10 Since the tension of the elastic member 10 is lowered, the elastic member 10 is easy to bend and is a seat cushion position when a small person is seated. At the time of U / M, the amount of deflection of the elastic member 10 is larger than at the time of L / M, while at the time of L / M, which is the seat cushion position when a large person is seated, it is more elastic than at the time of U / M. The amount of deflection of the member is reduced, so that a good seating feeling can always be obtained when a person of any physique is seated.
Furthermore, as compared with the prior art, it is sufficient to change the design by simply providing the eccentric portion 6 whose axis is shifted to the rod 5 connecting the rear link 4, and there is an advantage that it can be easily applied.

It is a perspective view which shows embodiment of this invention. It is a schematic front view which shows the principal part of FIG. FIG. 2 is an operation explanatory diagram of FIG. 1. FIG. 2 is an operation explanatory diagram of FIG. 1. It is a front view of the principal part which shows other embodiment. It is a perspective view of the principal part of FIG. FIG. 6 is an operation explanatory diagram of FIG. 5. 6 is a graph showing the relationship between the amount of deflection and the load in FIG.

DESCRIPTION OF SYMBOLS 1 Seat cushion frame 2 Floor fixing member 3 Front side link 4 Rear side link 5 Rod 6 Eccentric part 10 Elastic member
10a Spring member
10b S spring 11 Pad receiving member

Claims (4)

A vehicle seat having a lifter mechanism in which a front forming part and a rear forming part of a seat cushion frame are connected to a floor fixing member so as to be movable up and down. The lifter mechanism rotates the seat cushion frame and the floor fixing member. It consists of a link mechanism that can be freely connected, and on the side of the link mechanism that is connected to the seat cushion frame, there is a rod that is installed transversely in the width direction. In addition to providing an eccentric portion that rotates along with the elastic member, one end of the elastic member in the vehicle front-rear direction is fixed to the eccentric portion, the elastic member is interposed between the front forming portion and the rear forming portion, and the elastic member is It is installed so that the initial load is small at the upper position of the seat cushion frame and large at the lower position. Variable of the vehicle seat. 2. The elastic member according to claim 1, wherein the elastic member comprises a spring member, and at least one end of the spring member is fixed to the front forming portion, the rear forming portion, or the eccentric portion via a sheet-like or mat-like pad receiving member. hardness variable of the vehicle seat, characterized in that. 3. The lifter mechanism according to claim 1, wherein the lifter mechanism rotatably connects the front link of the seat cushion frame and the floor fixing member, and the rear link of the seat cushion frame and the floor fixing member. It consists of a rear link, the eccentric part is provided in the rear link, the elastic member is one or more coil springs, one end of this coil spring is directly fixed to the eccentric part, and the other end is the pad receiving member A vehicle seat having a variable hardness, wherein the vehicle seat is fixed to the front forming portion . 3. The spring member according to claim 2, wherein the spring member is an S spring, and the rear end of the S spring is fixed to the eccentric portion, while the front end of the S spring is fixed to the front forming portion of the seat cushion frame to change the deflection amount of the S spring. A vehicle seat of variable hardness type, characterized in that it is made to do so .

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