JPH04237646A - Automobile rear seat structure - Google Patents

Abstract

PURPOSE:To prevent the disarrangement of a passenger's sitting position caused by the bending adjustment of a seat back. CONSTITUTION:The front end part 20A of a seat cushion 20 is formed in such a way as to be vertically elevated by an oscillating frame 21, and the oscillating frame 21 is level-connected to a lower frame 12A by a lever 22 so that the oscillating frame 21 is oscillated interlockingly with the angle change of the lower frame 12A. In addition, it is so formed that the front end part 20A is protruded upward when an upper seat back 11 is inclined frontward in relation to a backward-inclined lower seat back 12.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear seat structure for an automobile, and more particularly to a rear seat structure for an automobile in which the upper part of the seat back is bent from a flat state to the lower part toward the front of the vehicle.

0002

[Prior Art] As a seat structure for automobiles,
As disclosed in Japanese Patent No. 150053, there is a seat back in which the upper and lower parts can be folded in the middle. By applying this foldable seat back configuration to the rear seat, the lower part of the seat back is tilted further rearward from its normal flat state, and the upper part is bent forward, thereby changing the head position of the seated occupant. can be lowered,
The head clearance can be secured accordingly and the roof can be lowered.

0003

[Problems with the Prior Art] However, if the lower part of the seat back is tilted rearward and the upper part is bent forward as described above, the sitting posture of the occupant will be pushed forward by the upper part of the seat back. , a problem arises in that the seated middle buttock gradually shifts forward and the sitting posture becomes disordered. Such a disordered sitting posture on the seat is undesirable as it may cause back pain. Another problem is that it is difficult to get on and off the vehicle.

0004

OBJECTS OF THE INVENTION In view of the above-mentioned circumstances, the present invention provides a rear seat structure for an automobile that can prevent the occupant's seating posture from being disturbed due to the bending of the seat back, and also facilitates getting in and out of the vehicle. The purpose is to provide.

[0005]

[Structure of the Invention] Therefore, in the rear seat structure of an automobile according to the present invention, in an automobile rear seat in which the upper part of the seat back is bent from a flat state with respect to the lower part toward the front side of the vehicle, the front end of the seat cushion A convex portion that protrudes upward is formed on the portion. According to this configuration, the convex portion can prevent the occupant's buttock from shifting forward. Further, the invention according to claim 2 allows the front end portion of the seat cushion to be raised and lowered vertically, and allows the front end portion of the seat cushion to be raised and lowered and the seat back to be bent when the seat back is in a flat state. It is constructed by providing an interlocking mechanism that interlocks the lowering position. As a result, when the seat back is bent and the occupant's buttocks tend to shift forward, the front end of the seat cushion rises to prevent the occupant's buttocks from shifting forward. When the front end of the seat cushion is unlikely to shift forward, the front end of the seat cushion is lowered to allow a more comfortable sitting posture. Furthermore, the invention according to claim 3 allows the front end of the seat cushion to be raised and lowered up and down, and is provided with a boarding/alighting detection means for detecting the getting on and off of an occupant, and when the boarding/alighting detection means detects that the passenger gets on and off, the seat cushion is moved up and down. The front end is lowered. According to this, the front end of the seat cushion is lowered when the occupant gets on and off, and the front end does not become an obstacle when the occupant gets on and off.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram corresponding to a side view of a rear seat of an automobile to which an embodiment of the rear seat structure for an automobile according to the present invention is applied.

The illustrated rear seat 1 includes a seat back 10 pivotably attached to a floor 2 with its lower end aligned with the rear end of a seat cushion 20 fixed to the upper surface of the floor.

The seat back 10 is vertically divided into an upper seat back 11 and a lower seat back 12, and the lower end of the lower frame 12A is pivoted to the floor 2. The upper seat back 11 is swingable (reclining) relative to the floor 2, and the lower end of the upper frame 11A is swingably connected to the upper end of the lower frame 12A via a link plate 13. The lower seat back 12 is pivoted so that it can swing relative to the lower seat back 12. In other words, the seat back 10 can be reclined, and the upper seat back 11 and the lower seat back 1 can be reclined.
It can be bent between 2.

The upper frame 11A is provided with a catcher 11B near its upper end that engages with a striker 2A fixed to the floor 2.
By engaging with the striker 2A, the position of the upper end of the upper seat back 11 in the front-rear direction is defined. Here, the striker 2A is formed by bending a round bar of a predetermined diameter into a U-shape, and is mounted on the floor 2 with its longitudinal direction being the vertical direction, and the catcher 11B is perpendicular to the striker 2A from the side thereof. The catcher 11B is configured to engage with the striker 2A.
When engaged, the upper seat back 11 cannot be moved in the longitudinal direction at the engagement part, but its lower end side can swing in the longitudinal direction using the engagement part as a fulcrum, and the angle can be changed. This is what has become.

A lower catcher 12B is provided near the upper end of the lower frame 12A, and a lower striker 2B is provided at a portion of the floor 2 that corresponds to the lower catcher 12B when the lower seat back 12 is reclined rearward. By engaging the lower catcher 12B with the lower striker 2B, the lower seat back 12 is fixed in a state tilted rearward at a predetermined angle. Incidentally, the engagement between the lower striker 2B and the lower catcher 12B is released by operating a release lever 12C.

A swing frame 21 is pivotally installed inside the front end portion 20A of the seat cushion 20 so as to be swingable about a predetermined distance rearward from the front end. When the front end portion 20A of the seat cushion 20 is swung in the direction to raise its tip, the upper surface of the front end portion 20A of the seat cushion 20 projects upward by a predetermined amount from a state where it is flat with the rear seating surface (upper surface).

The swing frame 21 is moved by a spring 23 interposed on the lower side of the tip in a direction in which the tip is on the lower side (counterclockwise in the figure: that is, the upper surface of the front end 20A of the seat cushion 20 is on the rear side). The end of the lever 22 is pivoted to the upper side of the pivot joint at the rear end, and the other end of the lever 22 is pivoted to approximately the center of the lower frame 12A in the vertical direction. The lower frame 12A is swing-driven via the lever 22 in conjunction with changes in the angle of the lower frame 12A.

The sheet 1 constructed as described above operates as follows. That is, when the lower catcher 12B of the lower seat back 12 is not engaged with the lower striker 2B, as shown in FIG. The upper surface of the front end portion 20A of the seat cushion 20 becomes flat with the rear seating surface 20B, and the lower frame 12A is linked to the rotational biasing of the swing frame 21 via the lever 22, so that the lower frame 12A, that is, the lower seat back 12 The reclining angle is defined as a predetermined angle greater than the most rearward angle, and at this time, the upper seat back 11 is substantially flat with the lower seat back 12. That is, in this state, the entire seating surface of the seat cushion 20 including the front end portion 20A is flat, and the seat back 10 is also approximately flat (not bent) at a predetermined reclining angle.

From this state, when the lower seat back 12 is tilted rearward and the lower catcher 12B is engaged with the lower striker 2B as shown in FIG. 2, it is fixed at this angle.
The upper seat back 11 swings around the engagement portion between the catcher 11B and the striker 2A, and its lower end moves rearward as the upper end of the lower seat back 12 moves rearward, resulting in an angle that is more nearly vertical. . In other words,
The lower seat back 12 is tilted rearward, and the upper seat back 11 is tilted forward, so that the seat back 10 is bent. At the same time, this lower seat back 1
The rearward tilting operation of the swing frame 2 is performed via the lever 22.
1 in the clockwise direction in the figure, the tip of the swing frame 21 is raised against the biasing force of the spring 23, and the front end 20A of the seat cushion 20 is caused to protrude upward.

That is, according to the above configuration, the seat back 1
0 is substantially flat and normal seating is possible, the seating surface of the seat cushion 20 is flat, while the seat back 10 is flat.
When the seat cushion 20 is bent and the sitting posture is likely to be disturbed, the front end 20A of the seat cushion 20 can be projected upward to prevent the buttock from shifting forward.

Next, another embodiment of the present invention shown in FIGS. 3 and 4 will be described. This system detects when an occupant is seated on the seat, and when the occupant is in the seated state, the front end of the seat cushion protrudes upward to prevent the seating position from being disturbed.When getting on and off, the protrusion of the front end is retracted to allow passengers to get in and out of the seat. The structure is designed to make it easier. The illustrated seat 1 is constructed by attaching a seat back 10, which has an upper seat back 11 and a lower seat back 12 integrally formed at a predetermined angle, to the rear end of a seat cushion 20, with their lower ends corresponding to each other.

Inside the front end portion 20A of the seat cushion 20, a swinging frame 21 similar to that of the above-described embodiment is pivotally installed so as to be swingable about a predetermined distance rearward from the front end. 21 in the clockwise direction in the figure to raise its tip, the front end 20A can be transformed from a state in which the upper surface is flat with the rear seating surface 20B to a state in which the upper surface protrudes upward by a predetermined amount. It has become. The swing frame 21 is attached to the front end 2 of the seat cushion 20.
An operating arm 21B is integrally formed orthogonally to the rear end of an arm portion 21A arranged substantially horizontally within 0A, and the lower end of the operating arm 21B is pivotally connected to the vehicle body.

An internal gear 24 having a circular arc shape with a predetermined radius is fixed at one end to the upper end of the operating arm 21B, and the frame of the seat cushion 20 is attached to the internal gear 24 as shown in a partially enlarged view in FIG. Motor 25 fixed to the member
A gear 26 fixed to a spindle is arranged in mesh with each other, and when the internal gear 24 is moved and driven by the rotation of the motor 25, the swing frame 21 swings and the upper surface of the front end 20A of the seat cushion 20 moves up and down. It is designed to be driven.

Here, the motor 25 is connected to the seat back 10.
The front end portion 20A of the seat cushion 20 rotates a predetermined number of times in a predetermined direction in response to a change in a signal from a pressure sensor 30, which serves as a boarding/alighting detection means for detecting whether an occupant is seated on the seat, provided approximately in the center of the seat cushion 20. It is designed to raise and lower. That is, when the pressure sensor 30 detects pressure (detects the occupant's seating), the swing frame 21 swings clockwise in the figure to cause the front end portion 20A of the seat cushion 20 to protrude upward, and the pressure sensor 30 When the oscillating frame 2 no longer detects pressure (no longer detects the occupant's seating)
1 in the counterclockwise direction in the figure to return the upper surface of the front end portion 20A of the seat cushion 20 to a state where it becomes flat with the rear seating surface 20B.

According to this configuration, when an occupant is seated, the front end portion 20A of the seat cushion 20 can be made to protrude upward to prevent the buttocks from shifting toward the front side. At this time, the protrusion of the front end portion 20A is retracted, and the seat cushion 20 becomes flat, making it easier to get on and off the vehicle.

[0021]

As described above, according to the rear seat structure for an automobile according to the present invention, the protrusion formed at the front end can compensate for the forward displacement of the occupant's buttock caused by the bending adjustment of the seat back. Alternatively, this can be prevented by the upward protrusion of the front end, and disturbance of the sitting posture can be prevented. Further, according to the invention according to claim 3, when getting on and off the vehicle, the protrusion of the front end portion is retracted, thereby making it possible to easily get on and off the vehicle.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram corresponding to a side view of a rear seat of an automobile to which an embodiment of a rear seat structure for an automobile according to the present invention is applied.

FIG. 2 is a diagram showing the operating state of FIG. 1;

FIG. 3 is a schematic configuration diagram corresponding to a side view of another embodiment.

FIG. 4 is a partially enlarged view of the front end of the seat cushion in FIG. 3;

[Explanation of symbols]

1...Rear seat 10... Seat back 11...Upper seat back (upper part) 12...Lower seat back (lower part) 20... Seat cushion 20A...front end (convex part) 21... Swing frame (interlocking mechanism) 22...Lever (interlocking mechanism) 30...Pressure sensor (boarding/alighting detection means)

Claims (3)

[Claims] Claim 1: In a rear seat of an automobile in which the upper part of the seat back is bent from a flat state to the lower part toward the front of the vehicle, a convex part projecting upward is formed at the front end of the seat cushion. An automobile rear seat structure characterized by . 2. In a rear seat of an automobile in which the upper part of the seat back is bent from a flat state to the lower part toward the front side of the vehicle, the front end of the seat cushion can be raised and lowered up and down, and the front end A rear seat structure for an automobile, characterized in that an interlocking mechanism is provided for interlocking the raising and lowering of the seat cushion and the bending of the seat back so that the front end of the seat cushion is lowered when the seat back is in a flat state. 3. In a rear seat of an automobile in which the upper part of the seat back is bent from a flat state to the lower part toward the front of the vehicle, the front end of the seat cushion can be raised and lowered up and down, and the front end of the seat cushion can be raised and lowered, and the 1. A rear seat structure for an automobile, comprising: a boarding/alighting detection means for detecting a passenger getting on or off, and configured to lower a front end of the seat cushion when the boarding/alighting detection means detects a passenger getting on or off.