JP2003180476A - Seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a seat which enables a crew to longitudinally move his/her upper half body reducing variation of vertical positions and tilting angles to enable him/her to take a relaxed posture. <P>SOLUTION: A upper frame 32 and a lower frame 31 of a frame body equipped with a vertically extended part so as to be a reinforcing member are built in the seat back 30, and the lower end of the upper frame 32 and the upper frame of the lower frame 31 are mutually rotatably connected by a hinge 31a. Furthermore, the lower end of the lower frame 31 is rotatably connected by a hinge 31b to a bracket 34 attached on a cross member 35 welded and fixed to the connecting part of the panel art 3 and the floor 2. On the other hand, a frame bracket 33 is fixed to the rear side of the upper frame 32. An adjusting mechanism 5 by a parallel link mechanism 50a is placed in between the frame bracket 33 and the upper part of the panel part 3. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat device capable of adjusting a position of a seat back serving as a seat back portion so as to take a comfortable posture. 2. Description of the Related Art Conventionally, as this type of seat device, one disclosed in Japanese Utility Model Publication No. 18833/1994 is known. This is because this seat device includes a cushion portion on which an occupant sits and a seat back portion serving as a backrest portion, and the seat back portion is configured by being divided into two parts, upper and lower.
The two seat back portions are rotatably connected to each other by a hinge, and the lower seat back portion and the rear end of the cushion portion are further connected by a hinge. In a state where the seat device is mounted on the vehicle, the cushion portion locks the upper seat back so as to be able to move back and forth on a horizontal floor, and is movable up and down on a vertical panel rising from the floor. By moving the cushion part back and forth on the floor, the front and rear positions of the upper and lower two seat back parts can be changed. As a result, the seat device allows the occupant to take a comfortable posture. [0003] However, in the above-mentioned conventional seat device, in conjunction with the movement in front of the cushion portion,
The seatback moves downward when the seatback section is tilted and operated to take a comfortable posture. For this reason, the upper body of the occupant also moves downward. Especially in the rear seat of the vehicle, if the position of the occupant's head moves down or the line of sight changes and the view outside the vehicle becomes difficult to see,
Seated persons are more susceptible to motion sickness. [0004] Therefore, an object of the present invention is to realize a seat device that can take a comfortable and comfortable posture by enabling the occupant to move in the front-rear direction with little change in the vertical and inclined positions of the upper body of the occupant. It is to be. [0005] In order to solve the above-mentioned technical problems, the technical means taken in the present invention comprises a cushion portion supported on a horizontal fixed portion, and a cushion portion above the cushion portion. In a seat device provided with a seat back portion supported by a vertical fixing portion that is arranged upright with respect to the horizontal fixing portion, a link mechanism that supports the seat back portion on the vertical fixing portion is provided, and the link mechanism is parallel. That is, a link mechanism is included. [0006] With this configuration, the seat device can be operated so as to move the occupant's upper body substantially horizontally without moving up and down. An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG. 1 shows a case where a seat device 10 according to the present invention is applied to a rear seat of a vehicle. And FIG.
The left side indicated by an arrow in FIG. The seat device 10 is mounted on the floor 2 (horizontally fixed portion) of the vehicle.
Seat cushion 2 to be used as a seat for the occupant
0, and a seat back 30 which is supported by a panel portion 3 (vertically fixed portion) which stands behind the floor 2 and which serves as an occupant's backrest portion. The seat back 30 has an upper frame 32 and a lower frame 31, each of which is a strength member and has a vertically extending portion. The lower end of the upper frame 32 and the upper end of the lower frame 31 are mutually rotated by hinges 31a. Connected as possible. Further, the lower end of the lower frame 31 is rotatably connected to a bracket 34 mounted on a cross member 35 welded and fixed to a connection portion between the panel portion 3 and the floor 2 by a hinge 31b. On the other hand, a frame bracket 33 is fixedly attached to a rear side of the upper frame 32. The adjustment mechanism 5 is arranged between the frame bracket 33 and the upper part of the panel section 3. The position of the seat back 30 can be arbitrarily adjusted between the position indicated by the solid line and the position indicated by the two-dot chain line in FIG. Next, the configuration of the adjusting mechanism 5 will be described with reference to FIG. The adjustment mechanism 5 has a link mechanism 50 disposed on each of the left and right sides of the upper frame 32. Since the left and right link mechanisms 50 are basically configured in a symmetrical shape, the link mechanism 50 on the right side in FIG. 2 will be described below as an example. The link mechanism 50 includes a base 51 attached to the panel section 3 by bolts (not shown), and a link bracket 58 located in front of the base 51 and attached to the frame bracket 33 by bolts 58a. The base 5 has links 5 in order from the top.
5, link 53 and link 52 are pivot 55a, pivot 5
3a and a pivot 52a so as to be freely rotatable. Each of the links 55, 53, 52 extends forward. A link 54 is provided at an intermediate portion between the links 52 and 53 so as to connect the links 52 and 53 to each other.
b, 53b. The link 54 extends in a vertical direction substantially parallel to the base 51. The pivots 52a, 53a, 52b, and 53b are arranged so as to form a substantially parallelogram with the apex at the center thereof, so that a so-called parallel link mechanism 50a is formed. With the parallel link mechanism 50a, the link 54 can be moved in the front-rear direction while keeping substantially parallel to the base 51. Further, at the tip of the links 52 and 53,
Links 56 and 57 are connected by pivots 56a and 57a, respectively. The links 56 and 57 extend forward, and their front ends are connected to flange portions 59 formed on the left and right sides of the link bracket 58 by pivots 559a and 59b. As is apparent from this configuration, each pivot 56a,
57a, 59a and 59b are arranged as vertices of a parallelogram, and form a double parallel link mechanism connected to the above-described parallel link mechanism 50a. Thus, the link bracket 58 is configured to be substantially parallel to the base 51. Further, as shown in FIG. 2, the pivots 52a of the left and right link mechanisms 50 are connected by a connecting shaft 71 extending in the horizontal direction. The left and right links 52 are fixed to the connection shaft 71 and rotate integrally. The link 56 extends rearward from the pivot 56 a, and the rear end thereof is connected to the tip of the link 55 by the pivot 55.
b. The link 56 and the link 55 restrict the vertical position of the link bracket 58 with respect to the base 51. With this link configuration, the link bracket 58 maintains a substantially parallel posture with respect to the base 51 and moves in a substantially horizontal direction. The parallel link mechanism described above does not need to be formed in a strict parallelogram, and the moving direction and the inclination of the link bracket 58 with respect to the base 51 are roughly determined while maintaining the link bracket 58 in a substantially parallel posture. The distance between the vertices may be changed so as to be changed as necessary within the range of movement in the horizontal direction. An arm 7 extending forward at right angles to the rotation axis of the connecting shaft 71 is provided at one end of the connecting shaft 71.
2 is fixedly mounted. Further, a substantially U-shaped hinge bracket 63 is fixedly mounted on the base 51 on the same side as the arm 72 in the left-right direction. The driving device 60 is mounted between the arm 72 and the hinge bracket 63. As further shown in FIG.
Is provided with a motor 65 and a speed reduction mechanism 62 integrally formed with the motor 65, and the drive screw 61 inserted through the speed reduction mechanism 62 can be moved by the operation of the motor 65. Bolt 67 for reduction mechanism 62
Is fixed to the hinge bracket 63 by a pivot 61a, and one end 61 of the drive screw 61
a is connected to the arm 72 by a pivot 61b. When the drive screw 61 moves so as to push down the tip of the arm 72 by the operation of the motor 65, the link 52 rotates counterclockwise in FIG. 2 and operates to push the link bracket 58 forward. ing. The drive screw 61 is provided with upper and lower stoppers 68 fixed at predetermined intervals. Next, the operation of the seat apparatus 10 configured as described above will be described. FIG. 3 shows the position of the adjusting mechanism 5 when the seat back 30 is adjusted to the position shown by the two-dot chain line in FIG. 1, that is, the rearmost position. FIG. , The state of the adjusting mechanism 5 when adjusted to the forefront. As shown in FIG. 3, when the drive screw 61 moves to the uppermost position, the lower stopper 68 fixed to the drive screw 61 comes into contact with the holder 66 and stops. When the drive screw 61 moves to the lowermost position as shown in FIG. 4, the upper stopper 68 of the drive screw 61 comes into contact with the holder 66 and stops. The seated person is the seat device 1
By operating a switch (not shown) provided at the position 0, the adjusting mechanism 5 is operated to an arbitrary state between the states shown in FIGS. 3 and 4, and is shown by a two-dot chain line of the seat back 30 in FIG. The seat back 30 can be moved to a desired position between the position indicated by the solid line and the position indicated by the solid line. The upper backrest surface of the seat back 30 moves in the front-rear direction substantially in parallel by the action of the link mechanism 50 configured to include the connected parallel link mechanism 50a. Further, in the seat device 10 according to the present invention which operates as described above, as in the prior art described at the beginning,
Seat cushion 20 for adjusting the position of the seat back
It is not necessary to move the vehicle, and the distance from the front seat is not reduced. In addition, a device for moving the seat cushion 20 is not required, and is realized with a simple configuration. As described above, when the seat device 10 of the present invention configured as described above is operated to adjust the position of the seat back 30, as shown in FIG. The upper body of the seated person leaning on 30 is supported so as to move in parallel back and forth without moving up and down. For this reason, the direction and the height of the line of sight are kept substantially the same, and a comfortable comfortable posture can be taken without changing the field of view.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a seat device according to the present invention. FIG. 2 is a perspective view of a link mechanism and a driving device of the seat device according to the present invention. FIG. 3 is a sectional view taken along line AA of FIG. 2 and shows a state where a link mechanism is adjusted to a rearmost portion. FIG. 4 is a cross-sectional view taken along line AA of FIG. 2, showing a state in which a link mechanism is adjusted to a forefront portion; FIG. 5 is a side view showing a relationship between the seat device according to the present invention and a seated person. [Description of Signs] 2 Floor (horizontal fixing part) 3 Panel (vertical fixing part) 10 Seat device 20 Seat cushion (cushion part) 30 Seat back (seat back part) 50 Link mechanism 50a Parallel link mechanism part

Claims (1)

Claims: 1. A cushion portion supported by a horizontal fixing portion, and a seat disposed above the cushion portion and supported by a vertical fixing portion standing upright with respect to the horizontal fixing portion. A seat device comprising a back portion, comprising: a link mechanism for supporting the seat back portion on the vertical fixing portion, wherein the link mechanism is configured to include a parallel link mechanism portion.