JPH08238144A - Vehicle rear seat - Google Patents

Abstract

PURPOSE: To bend and adjust a seat back into the optimum shape in response to the physique difference and taste of an occupant. CONSTITUTION: The upper end of the back frame 3 of a seat back 1 is fitted vertically movably along seat fitting rails 5, and the lower end of the back frame 3 is pivotally fitted to the rear end of the underframe 4 of a longitudinally movable seat cushion 2. A connection section 7a at the upper end is connected to the back frame 3 slidably along a nearly straight guide groove 8a provided on a guide rail 8 and extended obliquely downward, and a torsion bar 7 having an intermediate hold section 7c made rotatable centering on the vicinity of the vertical split line of the back frame 3 and a bar section 7b elastically exciting the seat back 1 backward into the folded state is fitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle rear seat in which the seat back can be bent and adjusted to an optimum shape in accordance with the physique of the occupant and his / her preference.

[0002]

2. Description of the Related Art Conventionally, as a vehicle rear seat in which the shape of a seat back can be flexibly adjusted, for example, Japanese Unexamined Patent Publication (Kokai) No.
As shown in JP-A-236914 and Japanese Utility Model Laid-Open No. 2-59031, the back frame of the seat back is divided into an upper frame and a lower frame, and the back frame is bent at the center to obtain an optimum shape. Those that are adjusted are widely used.

However, in such a conventional one, since the back frame itself is vertically divided into two parts, the number of parts is increased, the assembling work of the seat is complicated, and the weight is increased to reduce the weight. There is a problem in that the cost becomes high as well as the cost is reduced. There is also a problem that it is difficult to smoothly perform the bending adjustment work of the seat back because the connecting portion between the upper frame and the lower frame does not slide smoothly. In addition, although a seat that uses an integrated back frame is being developed to solve the above-mentioned problems, in this case, optimal bending adjustment of the seat back can be performed with respect to the movement of the seat cushion. The current situation is that it cannot be put to practical use because it cannot be done.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and the back frame is an integral structure, so that the seat assembling work can be easily performed and the weight of the parts can be reduced. The present invention has been completed for the purpose of providing a rear seat for a vehicle capable of reliably and smoothly adjusting the seat back to an optimum shape by following the forward and backward movement of the seat cushion. .

[0005]

SUMMARY OF THE INVENTION A vehicle rear seat of the present invention, which has been made to solve the above problems, mounts an upper end of a back frame of a seat back movably up and down along a seat mounting rail and mounts the back frame on the back frame. The lower end is pivotally attached to the rear end of the under frame of the seat cushion that can be moved back and forth, and the back frame has a connecting portion at the upper end along a substantially straight guide groove that is provided on a guide rail and extends diagonally downward. A torsion member that is slidably connected, and the middle holding portion is rotatable around the upper and lower halves of the back frame, and the bar portion elastically urges the seat back backward to bend the seat back in the middle. It is characterized by having a bar attached.

[0006]

In such a vehicle rear seat, the seat back as a whole tilts to follow the forward / backward movement of the seat cushion to ensure a comfortable posture of the occupant. Since the torsion bar is slidably connected and the intermediate bar part is rotatable, the bar part of the torsion bar not only tilts the seat back but also moves rearward the central part of the seat back. The seat is optimally shaped according to the occupant's body shape and the like by elastically bulging to the side and bending it into a bent state. Further, since the back frame is not a two-divided upper and lower type but an integrated structure, the number of parts is small and the seat assembly work can be facilitated and the weight of parts can be reduced.

[0007]

The present invention will now be described in detail with reference to the illustrated embodiments. In the figure, 1 is a seat back, 2 is a seat cushion, 3 is a back frame of the seat back 1, 4 is an underframe of the seat cushion 2 which can be moved back and forth, and 5 is attached to the rear part of the body through a bracket 6 facing forward. It is a slanted seat mounting rail 5. The lower end of the back frame 3 is pivotally connected to the rear end of the under frame 4 via a hinge 4a, and
The upper end of the seat is attached to the seat mounting rail 5 along a guide groove 5a formed in the vertical direction so as to be vertically movable. The entire back 1 is configured to tilt.

Reference numeral 7 is a torsion bar attached to the back frame 3, and this torsion bar 7 is shown in FIG.
As shown in FIG. 3, a frame-shaped member having a U-shaped portion whose lower end is a horizontal bar portion 7b is connected to an arm portion 7d through a horizontal holding portion 7c, and the end portion is an arm portion 7a, The connecting portions 7a at both ends are slidably connected to a substantially straight guide groove 8a extending obliquely downward from a guide rail 8 mounted obliquely forward from the rear portion of the body, and the intermediate holding portion 7c is backed. It is rotatable around a receiving metal 3a provided near the upper and lower halves of the frame 3, and is a middle folding position suitable for a comfortable posture of the seat back 1 following the tilting of the seat back 1. The central portion is repulsed by the torsion bar 7 and is bent rearward.
Further, as shown in FIG. 3, the bar portion 7b of the torsion bar 7 is connected to the cover 10 by the C ring 9 at the cover retracted position of the seat back. Since the guide groove 8a has a substantially straight shape extending obliquely downward, the connecting portion 7a can be slid smoothly and the occurrence of malfunctions is reduced.

If the height of the guide rail 8 is increased, the seat back 1 may be pressed and the riding comfort of the occupant may be deteriorated. Therefore, as shown in FIG. If links 11 are interposed between 7a, 7a and the guide rail 8, respectively,
This is preferable because the height of the guide rail 8 can be kept low.

With this construction, when the seat cushion 2 is moved back and forth, the lower end is pivotally connected to the rear end of the underframe 4 via a hinge 4a, and the upper end is seat-mounted. Since the rail 5 is vertically coupled to the guide groove 5a formed in the vertical direction so as to be movable up and down, the seat back 1 as a whole tilts following the forward and backward movement of the underframe 4 to provide a comfortable posture for the occupant. The back frame 3 of the seat back 1
A connecting portion 7a at the upper end is slidably connected along the guide rail 8 and an intermediate horizontal holding portion 7c following the bar portion 7b.
Is equipped with a torsion bar 7 which is rotatable around the upper and lower halves of the back frame 3.
The central portion of the seat back 1 is elastically bent rearward by the bar portion 7b of the torsion bar 7 so as to secure an optimally folded seat shape that matches the occupant's body shape and the like.

That is, when the seat cushion 2 is moved to the front side as shown in FIG. 5, the back frame 3 of the seat back 1 is guided downward by the guide groove 5a of the seat mounting rail 5 in conjunction with this. The entire seat is tilted to a comfortable posture. At this time, the connecting portion 7a at the upper end of the torsion bar 7 is linearly guided obliquely downward by the guide groove 8a of the guide rail 8 as the back frame 3 moves. The Rukoto. At this time, the torsion bar 7 is rotated around the intermediate horizontal holding portion 7c and the bar portion 7b is pressed toward the rear back frame 3 side, so that the seat back 1 is urged by the elastic force of the bar portion 7b. The central portion is bent backward in the state of being folded in the middle to ensure an optimum seat shape. Note that FIG. 6 shows an operation locus of the bar portion 7b when the torsion bar 7 rotates about an intermediate horizontal holding portion 7c. It can be seen that 7b operates so as to be pressed substantially linearly and stably toward the rear back frame side.

[0012]

As is apparent from the above description, since the present invention has the back frame as an integral structure, the number of parts is small, the assembling work of the seat can be easily performed, and the weight of the parts is reduced. In addition, the adjustment work can be performed reliably and smoothly so that the seat back has the optimum seat shape by following the forward and backward movements of the seat cushion, and the production cost can be significantly reduced. There is also an advantage that you can. Therefore, the present invention, as a vehicle rear seat that eliminates the conventional problems, greatly contributes to industrial development.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a back frame according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a connection portion between a torsion bar and a cover according to an embodiment of the present invention.

FIG. 4 is a perspective view showing another embodiment of the present invention in which a torsion bar and a guide rail are connected via a hinge.

FIG. 5 is a side view showing an operating state of the seat in the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an operation trajectory of a torsion bar in the embodiment of the present invention.

[Explanation of symbols]

 1 seat back 2 seat cushion 3 back frame 4 under frame 5 seat mounting rail 7 torsion bar 7a connecting part 7b bar part 7c holding part 8 guide rail 8a guide groove 11 link

Claims (2)

[Claims] 1. Back frame (3) for seat back (1)
The upper end of the back frame (3) is vertically movable along the seat mounting rail (5), and the lower end of the back frame (3) is pivotally mounted on the rear end of the under cushion (2) of the seat cushion (2). An upper end connecting portion (7a) is slidably connected to the back frame (3) along a substantially straight guide groove (8a) provided in a guide rail (8) and extending obliquely downward, and The middle holding part (7c) is rotatable around the upper and lower bisectors of the back frame (3), and the bar part (7b) repels the seat back (1) backwards to seat back (1). Torsion bar that breaks the middle (7)
A rear seat for a vehicle, which is equipped with. 2. The vehicle rear seat according to claim 1, wherein a link (11) is interposed between the connecting portion (7a) of the torsion bar (7) and the guide rail (8).