JPH09150655A - Seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To freely set vertical height of front and rear parts of a seat cushion. SOLUTION: A seat 10 is constituted of a lower rail 20 fixed on the side of a car body, a rear upper rail 30 axially installed on the side of a seat cushion 11 free to revolve and a front upper rail 40 axially installed on the side of the seat cushion 11 free to revolve. The rear upper rail 30 is inserted into the inside of a rear guide part free to slide, the front upper rail 40 is inserted into the inside of a front guide part free to slide, and when the seat cushion 11 is moved forward or backward, vertical height of a front part and/or a rear part of this seat cushion 11 is adjusted.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a vehicle seat.

[0002]

2. Description of the Related Art Conventionally, in a vehicle seat, when adjusting the position of a seat cushion, first, the front and rear positions of the seat cushion are adjusted by a seat slide device,
Next, the vertical height of the seat cushion is adjusted by the seat lifter. The seat slide device includes a pair of linear left and right lower rails fixed to the vehicle body in the front-rear direction, and a linear upper fixed to the seat cushion side while being slidably attached to the lower rails. It is equipped with rails.

However, in this conventional seat, when adjusting the position of the seat cushion, two operations, that is, a slide operation and a lifter operation, are required, and there is a problem that the operation is troublesome. Further, since it is necessary to provide a seat lifter separately from the seat slide device, there are problems that the number of parts increases, the cost increases, and the weight increases.

In order to solve such a problem, a vehicle seat equipped with a seat slide device having a seat lifter function has been proposed.

In this type of seat, the lower rail and the upper rail are formed in an arc shape with a predetermined radius of curvature such that the central portion thereof projects upward, and the vertical height of the seat cushion is changed according to the front-back position of the seat cushion. Is configured to adjust.

[0006]

However, in the vehicle seat equipped with the seat slide device having the seat lifter function, the vertical heights of the front and rear portions of the seat cushion do not change even if the radii of curvature of the lower rail and the upper rail are changed. Since it can only be adjusted in parallel to the inclination of the lower rail and upper rail, it is difficult to obtain the optimal seat cushion position, and there is a limit to the curvature of the lower rail and upper rail due to space restrictions, and the vertical height There was a problem that could not be set large.

The present invention has been made to solve the above-mentioned problems of the prior art, and its object is to adjust the vertical height of the front and rear portions of the seat cushion in accordance with the movement of the seat cushion in the front-rear direction. (EN) It is possible to provide a seat in which the upper and lower heights of the front and rear portions of the seat cushion can be freely set.

[0008]

To achieve the above object, in a seat according to claim 1 of the present invention, a lower rail fixed to a vehicle body side and a seat cushion side facing the rear side of the lower rail are provided. A rear upper rail movably attached to the lower rail, and a front guide member opposed to the front side of the lower rail and rotatably attached to the seat cushion side. The rear upper rail has a lower side. The rear guide portion formed along the front-rear direction of the vehicle body is slidably inserted into the rear guide portion formed along the front-rear direction of the vehicle body on the rear side upper side of the lower rail. A front guide portion formed in the lower part along the front-rear direction of the vehicle body is provided with a front guide part formed above or on the front side of the lower rail along the front-rear direction of the vehicle body. Is slidably inserted into the Togaido unit, the time of the seat cushion is moved forward or backward, it is characterized in that the adjustable vertical height of the front and rear portions of the seat cushion.

The seat according to claim 2 is the seat according to claim 1, wherein the rear guide portion and / or the front guide portion of the lower rail is curved or inclined, and the rear guide portion of the rear upper rail is provided. And / or the front guide portion of the front upper rail is curved or inclined according to the rear guide portion and / or the front guide portion of the lower rail.

The seat according to claim 3 is the seat according to claim 1, wherein the front side of the lower rail is formed in a substantially U-shaped cross section, and the right and left upper edge portions thereof are respectively outward. The front upper rail is bent to form a flange-shaped front guide portion, and the front guide portion is curved or inclined, and the front upper rail is formed in a substantially inverted U-shaped cross section, and its left and right lower edges are formed. Each of the parts is bent inward to form a flange-shaped front guide part, and the front guide part is curved or inclined according to the front guide part of the lower rail.

The seat according to claim 4 is the seat according to claim 1, wherein the rear guide portion of the lower rail and the front guide portion are made different in curvature or inclination, and the rear guide of the rear upper rail is provided. And a front guide portion of the front upper rail is curved or inclined in accordance with the rear guide portion and the front guide portion of the lower rail.

According to a fifth aspect of the present invention, in the seat according to the first aspect, the cross section of the front upper rail is formed in a substantially inverted U shape, and the cross section of the rear upper rail is inverted T. It is characterized in that it is formed in a letter shape.

The seat according to claim 6 is the seat according to claim 1, wherein the front side of the lower rail is formed in a U-shaped cross section, and upper and lower edges thereof are respectively bent inward. And forming a flange-shaped front guide part, and bending or inclining the front guide part. Further, the front upper rail is a roller slidable on the front guide part of the lower rail, and the rear side of the lower rail. Is characterized in that it is formed in a substantially U-shaped cross section, and the left and right upper edge portions thereof are respectively bent inward to form a flange-shaped rear guide portion.

Further, in the seat of claim 7, a lower rail fixed to the vehicle body side, a rear upper rail opposed to the rear side of the lower rail and pivotally mounted on the seat cushion side, and opposed to the front side of the lower rail. And a front upper rail pivotally attached to the seat cushion side, the lower rail is formed by a pipe, the pipe-shaped lower rail is curved or inclined, and the rear upper rail and the front upper rail are
The pipe-shaped lower rail is formed so that it can be inserted therethrough, and when the seat cushion is moved forward or backward, the vertical height of the front and rear portions of the seat cushion can be adjusted.

According to the above structure, when the seat cushion is moved in the front-rear direction, the rear upper rails and / or the front upper rails are moved in the vertical direction by the lower rails. As a result, the vertical height of the front and rear parts of the seat cushion can be changed as the seat cushion is moved in the front-rear direction, and the number of parts for which the conventional seat lifter is unnecessary can be greatly reduced. The operation can be simplified.

Further, the vertical heights of the front and rear portions of the seat cushion can be freely set by changing the radius of curvature or the inclination angle of the lower rail and the upper rail, so that the degree of freedom in design can be expanded.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described based on the embodiments shown in the drawings.

1 to 4 relate to a first embodiment of the present invention, FIG. 1 is a front view explanatory view of a seat, and FIG. 2 is II of FIG.
-II arrow enlarged sectional explanatory view, FIG. 3 is an III-III arrow enlarged sectional explanatory view of FIG. 1, and FIG. 4 is an exploded perspective explanatory view showing a main part of the seat.

In the figure, 10 is a vehicle seat, which is a lower rail 20 fixed to the vehicle body side, for example, the floor 13.
A rear upper rail 30 that is rotatably attached to the seat cushion 11 side so as to face the rear R side of the lower rail 20, and a seat cushion 11 side that faces the front F side of the lower rail 20. And a front upper rail 40 pivotally attached to the front upper rail 40.

The rear upper rail 30 has a rear guide portion 30b formed below the rear rail 30 along the front-rear direction (F-R direction) of the floor 13 and above the rear rail 20 of the lower rail 20 in the front-rear direction. The front guide portion 40b is slidably inserted into a rear guide portion 21b formed along the front upper rail 40 and is formed in the lower portion of the front upper rail 40 along the front-rear direction of the vehicle body. Is slidably inserted into a front guide portion 22b formed along the front-back direction of the floor 13,
When the seat cushion 11 is moved forward or backward, the vertical height of the front and rear portions of the seat cushion 11 can be adjusted.

Further, the rear guide portion 21 of the lower rail 20
b and the front guide portion 22b are curved or inclined, for example, curved, and the rear guide portion 30b of the rear upper rail 30 and the front guide portion 40b of the front upper rail 40 are connected to the rear guide portion 2 of the lower rail 20.
1b and the front guide portion 22b are respectively curved.

On the front F side of the lower rail 20,
The cross section (cross section orthogonal to the axis) is formed in a substantially U shape, and the left and right upper edge portions thereof are respectively bent outward to form a flange-shaped front guide portion 22b, and the front guide portion 22b is curved. The front upper rail 40 is formed in a substantially U-shaped cross section, and the left and right lower edges are bent inward to form a flange-shaped front guide portion 40b. The portion 40b is the front guide portion 22b of the lower rail 20.
It is characterized by being curved according to.

Further, the configuration according to the first embodiment of the present invention will be described in detail. The seat 10 includes a seat cushion 11 and a seat back 12. The seat cushion 11 has a front portion (front F side) that is high to support the thighs of an occupant and a rear portion (rear R). It is inclined so that it becomes lower toward it. Also, the seat back 12
Is attached to the rear end of the seat cushion 11 via a seat reclining device (not shown) so as to be rotatable in the front-rear direction.

The lower rail 20 is a seat cushion 11
A left and right pair (only one side is shown) are arranged on both left and right sides along the front-back direction of the floor 13, and are composed of a rear lower rail 21 and a front lower rail 22.

The rear lower rail 21 is arranged in the front-rear direction so as to face the floor 13, and has a base portion 21a having a substantially U-shaped cross section.
And flange-shaped rear guide portions 21b, 21b formed by bending the left and right upper edge portions of the base portion 21a outward respectively.
The rear guide portions 21b, 21b are curved in the upward direction on the rear R side and formed in an arc shape. The rear R side of the base portion 21 a is fixed to the floor 13 by the legs 23.

The rear upper rail 30 has a base portion 30a having a substantially inverted U-shaped cross section which is arranged in the front-rear direction so as to face the base portion 21a of the rear lower rail 21, and the left and right lower edge portions of the base portion 30a are respectively folded inward. The rear guide portions 30b, 30b are formed by bending and have a substantially U-shaped cross section. A mounting plate 31 is fixed to the upper surface of the base portion 30 a, and the mounting plate 31 is attached by a pivot 32 to the seat cushion 11.
It is pivotally attached to the side.

The rear guide portions 30b, 30b are formed in an arc shape having the same radius of curvature as the rear guide portions 21b, 21b of the rear lower rail 21, and the rear of the rear lower rail 21 via the pair of resin sliders 33, 33. It is slidably inserted in the guide portions 21b, 21b. Further, in order to improve the slidability of the rear upper rail 30, a roller 34 is interposed between the base portion 30a and the base portion 21a of the rear lower rail 21.

The front lower rail 22 is arranged continuously with the rear lower rail 21 on the front F side and is arranged in the front-rear direction so as to face the floor 13 and has a substantially U-shaped cross section, and the base 22a. The front guide portions 22b and 22b are formed by bending the left and right upper edge portions of the front side outward, and the front guide portions 22b and 22b are curved in a downward arc toward the front F side. ing. The front F side of the base portion 22a is fixed to the floor 13 by legs 24.

The front upper rail 40 has a base 40a having a substantially U-shaped cross section, which is arranged in the front-rear direction so as to face the base 22a of the front lower rail 22, and the base 40.
It is composed of front guide portions 40b, 40b each having a substantially U-shaped cross section formed by bending the left and right lower edge portions of "a" inward. A mounting plate 41 is fixed to the upper surface of the base portion 40a, and the mounting plate 41 is pivotally attached to the seat cushion 11 side by a pivot 42.

The front guide portions 40b, 40b are formed in an arc shape with the same radius of curvature as the front guide portions 22b, 22b of the front lower rail 22, and the front guides of the front lower rail 22 are provided through a pair of resin sliders 43, 43. It is slidably inserted in the portions 22b, 22b. Further, in order to improve the slidability of the front guide member 40, a roller 44 is interposed between the base portion 40a and the base portion 22a of the front lower rail 22.

Next, the operation according to the first embodiment of the present invention will be described. A seat cushion 11 shown by a solid line in FIG.
Are moved to the front F side as shown by imaginary lines, the rear guide portions 21b, 21b of the rear lower rail 21 and the front guide portions 22b, 22 of the front lower rail 22.
Since b is formed in an arc shape on the front F side downward,
Both the front part and the rear part of the seat cushion 11 descend. At this time, the front guide portion 22 is moved from the rear guide portion 21b.
When the radius of curvature of b is made smaller, the amount of lowering of the front portion of the seat cushion 11 than that of the rear portion thereof increases, and the front portion of the seat cushion 11 lowers via the rear upper rail 30 and the front guide member 40.

When the seat cushion 11 shown by the solid line in FIG. 1 is moved to the rear R side, the rear guide portions 21b and 21b of the rear lower rail 21 and the front lower rail 2 are moved.
Since the two front guide portions 22b, 22b are formed in an arc shape upward toward the rear R side, both the front portion and the rear portion of the seat cushion 11 are raised via the rear upper rail 30 and the front upper rail 40. Further, if the radius of curvature of the front guide portion 22b is made smaller than that of the rear guide portion 21b as in the case of descending, the amount of rise at the front portion of the seat cushion 11 will be increased.

In this way, the vertical height of the front and rear portions of the seat cushion 11 can be changed as the seat cushion 11 is moved in the front-rear direction. The position and the vertical height position can be selected at the same time. Further, the vertical heights of the front and rear portions of the seat cushion 11 are as follows: the rear guide portions 21b and 21b and the front guide portions 22b and 22b of the lower rail 20, the rear guide portion 30b of the rear upper rail 30, and the front guide portion 40b of the front upper rail 40. Since it can be freely set by changing the radius of curvature of, the degree of freedom in design can be expanded.

5 to 8 relate to the second embodiment of the present invention, FIG. 5 is a front view explanatory view of a seat, and FIG. 6 is a VI of FIG.
-VI is an enlarged cross-sectional view taken along the arrow, FIG. 7 is an enlarged cross-sectional view taken along the VII-VII arrow in FIG. 5, and FIG. Or, equivalent parts will be described with the same reference numerals.

In the second embodiment, the lower rail 2
The rear lower rail 21 of 0 has a base portion 21c having a substantially U-shaped cross section and arranged in the front-rear direction so as to face the floor 13, and the left and right upper edge portions of the base portion 21c are bent inward to form a substantially horizontal cross section. It is composed of inverted U-shaped rear guide portions 21d and 21d. The rear guide portions 21d and 21d are
For example, it is formed in a linear shape. The rear R side of the base portion 21c is fixed to the floor 13 by the legs 23.

The rear upper rail 30 is formed by stacking two plates to have an inverted T-shaped cross section.
Base portion 3 arranged in the front-rear direction facing the base portion 21c of 0
0c and a rear guide portion 30 having a substantially U-shaped cross section formed by bending the lower edges of the base portion 30c in opposite directions.
d and 30d. The upper portion of the base portion 30c is rotatably attached to the seat cushion 11 side by a pivot 35, and the rear guide portions 30d and 30d are connected to the rear guide portion 21d of the rear lower rail 21 via a pair of resin sliders 36 and 36, respectively. 21d is slidably inserted.
Further, in order to improve the slidability of the rear upper rail 30, a roller 37 is interposed between the base portion 21c of the rear lower rail 21 and the rear guide portions 30d and 30d of the rear upper rail 30.

Front lower rail 22 of lower rail 20
Is a base portion 22c having a substantially U-shaped cross section and arranged in the front-rear direction so as to face the floor 13, and a left and right upper edge portion of the base portion 22c is bent outward to form a substantially inverted U-shaped cross section. The front guide portions 22d and 22d are formed, and the front guide portions 22d and 22d are curved in the upward direction on the rear R side and formed in an arc shape. The front F side of the base portion 22c is fixed to the floor 13 by legs 24. Further, the distance a between the inner wall surfaces of the base portion 22c is set to be larger than the distance b between the outer wall surfaces of the rear guide portions 30d and 30d of the rear upper rail 30, which allows the rear upper rail 30 to move toward the front lower rail 2.
It does not interfere even if it enters the 2nd side. Therefore, with the above structure, the rear upper rail 30
Rear guide portions 30d and 30d of the front lower rail 2
Since it is guided by 2, the rear guide portions 30d, 30
As long as d and the front lower rail 22 overlap, the overall length of the lower rail 20 can be shortened, and the seat slide device can be downsized.

The front guide portions 40b, 40b of the front upper rail 40 are formed in an arc shape with the same radius of curvature as the front guide portions 22d, 22d of the front lower rail 22, and a pair of sliders 45, 45.
It is slidably inserted into the front guide portions 22d, 22d via.

In the second embodiment, the rail shapes are different on the front F side and the rear R side. That is, since the front side F does not require much peel strength,
It has a shape of a C-shaped channel with little backlash, and requires peel strength on the rear R side, so it has an inverted T-shape with high strength. As a result, a seat slide device that combines the features of the respective shapes can be obtained.

The other structure is similar to that of the first embodiment, and the description thereof is omitted. Next, the operation according to the second embodiment of the present invention will be described. When the seat cushion 11 shown by the solid line in FIG. 5 is moved to the front F side as shown by the imaginary line, the front guide portions 22d, 22d of the front lower rail 22 are formed in an arcuate shape on the front F side downward. The front portion of the seat cushion 11 descends via the upper rails 40.

When the seat cushion 11 shown by the solid line in FIG. 5 is moved to the rear R side, the front lower rail 2
Since the two front guide portions 22d, 22d are formed in an arc shape in the upward direction on the rear R side, the front portion of the seat cushion 11 rises via the front upper rail 40.

The vertical height of the front portion of the seat cushion 11 is the same as the front guide portion 2 of the front lower rail 22.
2d, 22d and the front guide portions 40b, 40b of the front upper rail 40 can be freely set by changing the respective radii of curvature.

9 to 11 relate to the third embodiment of the present invention, FIG. 9 is a front view explanatory view of the seat, and FIG. 10 is FIG.
X-X arrow enlarged cross-sectional explanatory view, FIG. 11 is an exploded perspective explanatory view showing the main part of the seat, and the same or equivalent parts as those shown in the second embodiment are assigned the same reference numerals and described. To do.

In the third embodiment, the lower rail 2
The front lower rail 22 of 0 has a base portion 22e having a U-shaped cross section and arranged in the front-rear direction so as to face the floor 13, and a front guide formed by bending the upper and lower edges of the base portion 22e inward at right angles. It consists of the part 22f,
The front guide portion 22f is curved or inclined, for example, curved toward the rear R and is formed in an arc shape.

The front roller 40 as a front upper rail is rotatably supported by a mounting plate 46 via a mounting shaft 45 protruding from the center thereof, and the mounting plate 46 is fixed to the seat cushion 11 side. Has been done. The front roller 40 is slidably inserted in the front guide portion 22f of the front lower rail 22.

In the third embodiment as well, in order to obtain the same effect as that of the second embodiment, the lower rail 20
The shape of the rail is different between the front F side and the rear R side.

The other structure is similar to that of the second embodiment, and the description thereof is omitted.

Next, the operation according to the third embodiment of the present invention will be described. Seat cushion 11 shown by a solid line in FIG.
Is moved to the front F side as shown by a virtual line, the front guide portion 22f of the front lower rail 22 is formed in an arc shape downward on the front F side.
The front portion of the seat cushion 11 descends through 0.

When the seat cushion 11 shown by the solid line in FIG. 9 is moved to the rear R side, the front lower rail 2
Since the second front guide portion 22f is formed in an arc shape in the rear R upward direction, the front portion of the seat cushion 11 is raised via the roller 40.

The vertical height of the front and rear portions of the seat cushion 11 can be freely set by changing the radius of curvature of the front guide portion 22f of the front lower rail 22.

The present invention is not limited to the above-described embodiments. For example, the structures of the lower rail 20 and the upper rails 30 and 40 of the second and third embodiments are reversed, and the seat cushion 11 in the front-rear direction. The vertical height of the front and rear portions of the seat cushion 11 can be changed with the movement of the seat cushion 11.

12 to 14 relate to a fourth embodiment of the present invention. FIG. 12 is a front view explanatory view of a seat, FIG. 13 is an enlarged sectional explanatory view taken along the arrow XIII-XIII of FIG. 12, and FIG. 14 is a seat. It is an exploded perspective view showing a main part of the above, and the same or equivalent parts as those shown in the first embodiment will be designated by the same reference numerals.

The seat 10 according to the fourth embodiment has a lower rail 20 fixed to the vehicle body side, for example, the floor 13.
And a rear upper rail 30 that is rotatably attached to the seat cushion 11 side so as to face the rear R side of the lower rail 20, and is rotatable to the seat cushion 11 side so as to face the front F side of the lower rail 20. And a front upper rail 40 pivotally attached to the front upper rail 40.

Then, the lower rail 20 is formed in a pipe shape, and the pipe-shaped lower rail 20 is curved or inclined, and the rear upper rail 30 and the front upper rail 40 are formed so that the pipe-shaped lower rail 20 can be inserted. When the seat cushion 11 is moved forward or backward, the vertical height of the front and rear portions of the seat cushion 11 can be changed.

Further, the configuration according to the fourth embodiment will be described in detail. The lower rail 20 is made of pipe material,
A pair of left and right (only one side is shown) are arranged on the left and right sides of the seat cushion 11 along the front-rear direction of the floor 13, and the rear R side and the front F side of the lower rail 20 are fixed to the floor 13 by legs 25 and 26, respectively. It is fixed to. Further, the pipe-shaped lower rail 20 is curved or inclined, for example, curved toward the rear R to form an arc shape.

The rear upper rail 30 is composed of a base portion 30e that is pivotally attached to the seat cushion 11 side by a pivot 38, and a bearing mounting portion 30f in which the lower end edge of the base portion 30e is bent in an arc shape. The rear R side of the lower rail 20 is fitted into the bearing 30g press-fitted into the bearing mounting portion 30f.

The front upper rail 40 has a pivot 39
The base 40e is rotatably attached to the seat cushion 11 side by means of a bearing, and the bearing mounting portion 40f is formed by bending the lower end edge of the base 40e in an arc shape. The bearing is press-fitted into the bearing mounting portion 40f. The front F side of the lower rail 20 is fitted into 40 g.

Next, the operation of the fourth embodiment of the present invention will be described. When the seat cushion 11 shown by the solid line in FIG. 12 is moved to the front F side as shown by the phantom line, the lower rail 20 is formed in an arc shape downward on the front F side, so that the rear upper rail 30 and the front upper rail 40 are formed. The front portion of the seat cushion 11 descends via the, and the rear portion also descends.

When the seat cushion 11 shown by the solid line in FIG. 12 is moved to the rear R side, the lower rail 20 is formed in an arc shape in the rear R ascending, so that the rear upper rail 30 and the front upper rail 40 are interposed. As the front portion of the seat cushion 11 rises, the rear portion also rises.

The vertical height of the front and rear portions of the seat cushion 11 can be freely set by changing the radius of curvature of the lower rail 20. Further, the number of parts is smaller than that in the other embodiments, and the cost can be reduced.

The seat slide device is provided with a lock device (not shown) for locking the movement between the rear upper rail 30, the front upper rail 40 and the lower rail 20, and this lock device has been conventionally used. Since the one having a certain structure is adopted, the description is omitted.

[0062]

As described above, according to the present invention, when the seat cushion is moved in the front-rear direction, the rear upper rail and / or the front upper rail is moved in the vertical direction by the lower rail. As a result, the vertical height of the front and rear parts of the seat cushion can be changed as the seat cushion is moved in the front-rear direction, and the conventional seat lifter is no longer required, so the number of parts can be significantly reduced. In addition, the operation can be simplified.

Further, the vertical height of the front and rear portions of the seat cushion can be freely set by changing the radius of curvature or the inclination angle of the lower rail and the upper rail, so that the degree of freedom in design can be increased. Furthermore, the amount of vertical height adjustment can be set to a large value.

[Brief description of the drawings]

FIG. 1 is a front view explanatory diagram of a seat according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along the line II-II of FIG.

FIG. 3 is an enlarged cross-sectional explanatory view taken in the direction of arrows III-III in FIG. 1;

FIG. 4 is an exploded perspective view showing the main part of the seat shown in FIG.

FIG. 5 is a front view explanatory diagram of a seat according to a second embodiment of the present invention.

6 is an enlarged cross-sectional view taken along the line VI-VI of FIG.

7 is an enlarged cross-sectional explanatory view taken along the line VII-VII of FIG.

FIG. 8 is an exploded perspective view of the main part of the seat shown in FIG.

FIG. 9 is a front view explanatory diagram of a seat according to a third embodiment of the present invention.

10 is an enlarged cross-sectional explanatory view taken along the line X-X of FIG.

FIG. 11 is an exploded perspective view showing the main part of the seat shown in FIG. 9;

FIG. 12 is a front view explanatory diagram of a seat according to a fourth embodiment of the present invention.

13 is an enlarged cross-sectional explanatory view taken along the line XIII-XIII of FIG.

FIG. 14 is an exploded perspective view showing the main parts of the seat shown in FIG. 12;

[Explanation of symbols]

 10 seat 11 seat cushion 13 vehicle body (floor) 20 lower rail 21b rear guide portion 21d rear guide portion 22d front guide portion 22f front guide portion 30 rear upper rail 30b rear guide portion 30d rear guide portion 40 front upper rail (front roller) 40b front Guide part

Claims (7)

[Claims] 1. A lower rail fixed to a vehicle body side, a rear upper rail rotatably pivoted to a seat cushion side facing a rear side of the lower rail, and a seat facing a front side of the lower rail. The rear upper rail includes a front upper rail rotatably pivotally mounted on the cushion side, and the rear upper rail has a rear guide portion formed along the front-rear direction of the vehicle body below the rear upper rail. Is slidably inserted into a rear guide portion formed along the front-rear direction of the vehicle body, and a front guide portion formed along the front-rear direction of the vehicle body is formed at a lower portion of the front upper rail. The seat cushion is slidably inserted upward or laterally along the longitudinal direction of the vehicle body to move the seat cushion forward or backward. A seat characterized in that the vertical height of the front portion and / or the rear portion of the seat cushion can be adjusted when the seat cushion is moved. 2. The seat according to claim 1, wherein the rear guide portion and / or the front guide portion of the lower rail is curved or inclined, and the rear guide portion of the rear upper rail and / or the front upper rail is provided. A seat characterized in that the front guide portion is curved or inclined in accordance with the rear guide portion and / or the front guide portion of the lower rail. 3. The seat according to claim 1, wherein a front side of the lower rail is formed in a U-shaped cross section, and left and right upper edge portions thereof are respectively bent outward to form a flange-shaped front. A guide portion is formed, and the front guide portion is formed by being curved or inclined, and the front upper rail is formed in a substantially inverted U-shaped cross section.
A seat characterized in that the left and right lower edge portions are respectively bent inward to form a flange-shaped front guide portion, and the front guide portion is curved or inclined according to the front guide portion of the lower rail. 4. The seat according to claim 1, wherein the rear guide portion of the lower rail and the front guide portion have different curvatures or inclinations, and the rear guide portion of the rear upper rail and the front of the front upper rail. A seat characterized in that the guide portion is curved or inclined in accordance with the rear guide portion and the front guide portion of the lower rail. 5. The seat according to claim 1, wherein a cross section of the front upper rail is formed in a substantially inverted U shape, and a cross section of the rear upper rail is formed in an inverted T shape. A sheet characterized by that. 6. The seat according to claim 1, wherein a front side of the lower rail is formed in a U-shaped cross section.
The upper and lower edges are respectively bent inward to form a flange-shaped front guide portion, and the front guide portion is curved or inclined, and further, the front upper rail is slidable on the front guide portion of the lower rail. In addition, the rear side of the lower rail is formed into a substantially U-shaped cross section, and the left and right upper edge portions thereof are respectively bent inward to form a flange-shaped rear guide portion. Sheet. 7. A lower rail fixed to a vehicle body side, a rear upper rail rotatably attached to a seat cushion side to face a rear side of the lower rail, and a seat to face a front side of the lower rail. It is composed of a front upper rail pivotally attached to the cushion side, the lower rail is formed of a pipe, and the pipe-shaped lower rail is curved or inclined, and the rear upper rail and the front upper rail are: A seat characterized in that the pipe-shaped lower rail is formed so that it can be inserted therethrough, and that when the seat cushion is moved forward or backward, the vertical height of the front and rear portions of the seat cushion can be adjusted.