JP2589977Y2 - Seat device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat device, and more particularly to a seat device having a reclining mechanism.

[0002]

2. Description of the Related Art In a conventional seat device having a reclining mechanism, a hip point serving as a center point of rotation of an occupant and a center point of rotation of a seat back are displaced.
At the time of reclining, the relative position between the backrest point of the occupant and the occupant support point of the seatback corresponding to the backrest point changes.For example, when the seatback is tilted backward from its standard position to the last tilted position, the occupant's back is seated. When the seat back is raised from the rearmost tilt position to the standard position side, the back of the occupant is pulled down by the seat back, and as a result, the occupant is seated at the time of reclining. She felt oppressed from the side and sometimes wrinkled on her back.

In order to solve such inconveniences,
For example, as disclosed in Japanese Patent Publication No. 52-37427, a technique has been proposed for matching the occupant's hip point with the pivot point of the seat back.

[0004] When the hip point of the occupant is coincident with the pivot point of the seat back, the pivot point is located considerably forward of the rear end of the seat cushion. When the lower end of the seat back is positioned at the rear end of the seat cushion in a state where the seat back is set to the standard position, the rear end of the seat cushion and the seat back are reclined when the seat back is reclined to the most inclined position. The lower end interferes and the reclining operation becomes impossible. For this reason, in order to avoid such interference at the time of reclining, it is customary to cut out a part of the lower end of the seat back as in the above-mentioned known example.

[0005]

However, when a part of the lower end portion of the seat back is cut out to avoid interference with the seat cushion, the seat back is set at the standard position. A relatively large gap is formed between the lower end of the seat back and the seat cushion, which is disadvantageous in terms of design, and there is a problem that the seating feeling is deteriorated due to insufficient supporting performance of the occupant's buttocks. Was.

Therefore, the present invention can prevent the displacement between the backrest point of the occupant and the occupant support point of the seat back during reclining as much as possible without incurring design restrictions and lowering the occupant's support performance. The present invention has been made to provide such a seat device.

[0007]

According to the present invention, as a specific means for solving such a problem, a pivot provided on a rear end portion of a seat cushion so as to substantially coincide with a hip point of an occupant on the side of the seat cushion is provided. In a seat device in which a seat back is attached so as to be tiltable in the front-rear direction via a fulcrum shaft, an upper seat back that constitutes a backrest portion of an occupant and is rotatably supported by the rotation fulcrum shaft. And a lower seat back which is foldably connected to a lower end portion of the upper seat back via a pivot pin provided on the back side of the seat back and is formed so as to correspond to the buttocks of the occupant. In the standard position of the seat back where the upper seat back is set up, the lower seat back is placed at the lower end of the upper seat back. To form the same seat back surface together with the upper seat back, and when the upper seat back moves backward from its standard position to the last tilt position, the lower seat back is moved relative to the upper seat back. A guide mechanism for guiding the movement of the lower seat back so as to be bent to the rear side and pass through the rear side of the rear end of the seat cushion and retract to the lower side of the seat cushion. Is what you do.

[0008]

According to the present invention, with this configuration, when the seat back is set at the standard position, the lower seat back is continuously connected to the lower end of the upper seat back by the guide mechanism so that the same seat back surface is formed. With this configuration, there is no gap between the seat back and the seat cushion, and the lower seat back properly supports the butt of the occupant.

[0009] On the other hand, when the seat back is tilted backward, the upper seat back pivots about a pivot shaft disposed at a position substantially coincident with the occupant's hip point. There is almost no misalignment between the point and the backrest point of the occupant, which prevents the occupant from feeling oppressed from the upper seatback side and wrinkling of the back of the occupant's clothes. .

Further, in this case, the lower seat back is guided by the guide mechanism with the backward tilting operation of the upper seat back, and passes through the rear side of the rear end of the seat cushion while being bent to the rear side of the seat back. As a result, the interference between the lower seat back and the seat cushion is reliably avoided.

[0011]

[Effect of the Invention] Therefore, according to the seat device of the present invention,
When the seat back is set to the standard position, the lower seat back is continuously connected to the lower end of the upper seat back to prevent a gap from being generated between the seat back and the seat cushion, while the lower seat back is tilted backward when the seat back is tilted. The conventional seat is designed to avoid the interference between the seat back and the seat cushion by retracting the seat back to the lower side of the seat cushion while bending the seat back to the back side of the upper seat back. When the seat back is set at the standard position as in the device, there is no gap between the seat back and the seat cushion, the appearance is good when the seat back is set at the standard position, and the butt of the occupant is supported. Performance is maintained properly, and a smooth reclining operation of the seat back is ensured. Compatibility between design properties and practical performance of the device is intended to be achieved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A seat apparatus according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a seat apparatus Z for a train according to an embodiment of the present invention. The seat device Z includes a seat cushion 1 disposed between a pair of left and right side wall members 5, 5 also functioning as armrests, and a seat cushion 1 attached to a rear end of the seat cushion 1 described below. And a seat back 2.

The seat back 2 has an upper and lower divided structure of an upper seat back 3, which will be described later, which constitutes the backrest portion of the occupant M, and a lower seat back 4, which corresponds to the buttocks of the occupant M. The upper seat back 3 has a "U-shaped" upper seat back frame 11 attached to a support bar 13 provided horizontally at a lower end thereof. As shown in FIGS. 1 and 2, the support bar 13 has both ends protruding into the side wall members 5, 5, and the protruding ends thereof are respectively provided with a swing lever 1 having a predetermined length.
4, 14 are fixed. Further, one end of each of the swing levers 14, 14 is connected to a pair of left and right coaxially mounted in the seat width direction via a bracket 16 provided on the inner surface of the inner wall surface 5a, 5a of each of the side wall members 5, 5. The fulcrum shafts 15 and 15 are pivotally supported respectively. Further, one of the pair of swing levers 14, 14 has a lock mechanism 20 attached via a bracket 22 inside the side wall member 5.
Are connected at one end.

Therefore, the upper seat back 3 releases the locking action of the lock mechanism 20 by operating the lock operation knob 21 provided on the front surface of the side wall member 5, whereby the respective rotation fulcrum shafts 15, 15 are released. Can be tilted in the seat front-rear direction with the rotation center axis as the rotation center axis. As shown in FIG. 3, the upper seat back 3 is tilted rearward so as to extend to a substantially upright standard position and to the rear side of the seat cushion 1. It is possible to tilt between the upper and lower positions of the last tilt position, and the attitude of the lock operation knob 21 is stopped at the predetermined tilt position by stopping the operation of the lock operation knob 21 to lock the lock mechanism 20. . In FIG. 1, reference numeral 7 denotes an escape groove provided on the inner wall surface 5a of the side wall member 5 to allow the support bar 13 to rotate.

In this embodiment, the positions of the pivot shafts 15 and 15 and the swing levers 14 and
The relative mounting position of the swing lever 14 with respect to the upper seat back frame 11 and the length of the swing lever 14 are set as follows. That is, first, the mounting position of the rotation fulcrum shaft 15 is, in this embodiment, the mounting position of the rotation fulcrum shaft 15 so as to coincide with the hip point P of the occupant M seated on the seat cushion 1. Is set. As for the length of the swing lever 14 and the relative mounting position of the swing lever 14 with respect to the upper seat back frame 11, the upper seat back 3 is set at a standard position as shown in FIG. In this state, the lower end of the upper seat back 3 is located above the pivot shaft 15 to form a predetermined gap between the lower end of the upper seat back and the seat cushion 1, and the upper seat back 3 is In the state in which the seat back is set to the rearmost position, the lower end of the upper seat back 3 is appropriately set so as to approach the rear end of the seat cushion 1 as shown in FIG. A lower seat back 4, which will be described later, is provided to fill the gap formed when the upper seat back 3 is set at the standard position, and when the upper seat back 3 is set at the most inclined position. A guide mechanism X, which will be described later, is provided to remove the lower seat back 4 from the lower end side of the upper seat back 3 and retract the seat back below the seat cushion 1.

The lower seat back 4 is located at the lower end of the seat back 2 and functions to support the buttocks of the occupant M. As shown in FIGS. 1 and 2, the lower seat back 4 is bent in a substantially rectangular shape. A lower seat back frame 12 is provided. The lower seat back frame 12
Is a pair of left and right brackets 17, 17 provided on the support bar 13 on the upper seat back 3 side in a rearwardly extending state. Are connected to each other through pivot pins 19, 19, respectively, so that the upper seat back 3 is supported such that it can be bent with its back side as a bending center.

As shown in FIG. 3, when the upper seat back 3 is set at the standard position, the lower seat back 4 is connected to the lower end of the upper seat back 3 so as to be continuous with the lower seat back 3. Together form the same seat back surface, and the lower end thereof is brought close to the rear end of the seat cushion 1 (hereinafter, the posture of the lower seat back 4 in this case is referred to as a use posture). on the other hand,
As shown in FIG. 5, in a state where the upper seat back 3 is set to the rearmost inclined position, the lower seat back 4
Is bent to the back side of the upper seat back 3 around the pivot pin 19 so that the upper seat back 3
And positioned below the seat cushion 1.
(Hereinafter, the posture of the lower seat back 4 in this case is referred to as a retracted posture).

As described above, the lower seat back 4 moves between the use position and the retracted position in accordance with the rotational position of the upper seat back 3, so that the seat back 2 and the seat cushion in the standard position are set. 1 is prevented from being formed, and interference between the seat back 2 and the seat cushion 1 at the time of setting the rearmost tilt position is prevented, so that a smooth reclining operation can be performed. is there. The operation of the lower seat back 4 is realized by a guide mechanism X described later.
It is.

The guide mechanism X includes a pair of left and right guide pins 9, 9 provided at both left and right ends of a lower end portion of the lower seat back frame 12 so as to extend outward in the width direction, respectively. Guide grooves 8, 8 are formed on the wall surface 5a to engage the guide pins 9, 9, respectively. And the shape of the guide grooves 8, 8 is
As the upper seat back 3 tilts, the pivot pin 1
9 rotates in an arc, for example, when the upper seat back 3 is
When moving from the standard position shown in FIG. 5 to the rearwardly inclined position shown in FIG. 5, the lower seat back 4 in the use position as shown in the intermediate position shown in FIG. When the upper seat back 3 is moved from the last inclined position to the standard position side while the upper seat back 3 is moved to the standard position side, the lower seat back 4 in the retracted posture is gradually expanded while being moved to the lower surface side through the end side. A shape that can be moved to the upper surface side of the seat cushion 1 near the rear end thereof to reach the standard position and continue to the lower end of the upper seat back 3 so that the seat back can be set to a posture for use. It has been.

As described above, the upper seat back 3 and the lower seat back 4 are divided into two parts, and the posture of the lower seat back 4 is switched between the use posture and the retracted posture in accordance with the tilting of the upper seat back 3. According to the seat apparatus Z provided with the controlled seat back 2, first, in the standard position, the upper seat back 3 and the lower seat back 4 are integrated to constitute one seat back 2 and Since there is no gap between the seat back 4 and the seat cushion 1, for example, the seat back 2 and the seat cushion 1 are set in the standard position as in the above-mentioned known example.
As compared with the structure in which a gap is formed between the vehicle and the vehicle, the appearance is improved and the design is improved, and the lower seat back 4 securely supports the buttocks of the occupant M. The ring should be good.

On the other hand, when the seat back 2 is reclined, the position of the rotation fulcrum shaft 15 serving as the rotation center point of the upper seat back 3 constituting the backrest portion of the occupant M is set at the hip point P of the occupant M on the seat cushion 1 side. As shown in FIGS. 3 to 5, regardless of the tilt of the seatback 2, the seat vertical direction between the backrest point of the occupant M and the occupant M support point of the upper seatback 3 is shown in FIGS. The relative position is maintained substantially constant, and it is possible to surely prevent the occupant M from giving unnecessary pressure and from wrinkling clothes.

In particular, when the upper seat back 3 is tilted from the standard position to the rearmost tilt position, the lower seat back 4 is moved to the rear of the upper seat back 3 in accordance with the tilting operation of the upper seat back 3. Since it is bent to the side to form a moving space between the lower end of the upper seat back 3 and the rear end of the seat cushion 1, the reclining action is not hindered by the interference between the two and smooth. A simple reclining operation becomes possible.

[Brief description of the drawings]

FIG. 1 is a perspective view of a seat device according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a II-II portion of FIG.

FIG. 3 is an operation explanatory view of the seat device shown in FIG. 1;

FIG. 4 is a state change diagram of the sheet device shown in FIG. 3;

5 is a state change of the sheet device shown in FIG.

[Explanation of symbols]

1 is a seat cushion, 2 is a seat back, 3 is an upper seat back, 4 is a lower seat back, 5 is a side wall member, 7
Is an escape groove, 8 is a guide groove, 9 is a guide pin, 11 is an upper seat back frame, 12 is a lower seat back frame, 13 is a support bar, 14 is a swing lever, 15 is a pivot point, 16 is a bracket, 17 is a bracket, 18 is a bracket, 19 is a pivot pin, 20 is a lock mechanism, 21 is a lock operation knob, 22 is a bracket, M is an occupant, P is a hip point, X is a guide mechanism, and Z is a seat device.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A47C 1/024 A47C 7/46 B60N 2/22

Claims (1)

(57) [Scope of request for utility model registration] 1. A seat device comprising: a seat back which is attached to a rear end of a seat cushion so as to be tiltable in a front-rear direction via a rotation fulcrum shaft provided substantially in line with a hip point of an occupant on the seat cushion side. An upper seat back which constitutes a backrest portion of an occupant and is rotatably supported by the pivot shaft, and is provided at a lower end portion of the upper seat back on the back side of the seat back. At the standard position of the seat back where the upper seat back is in an upright state, it is divided into a lower seat back that is foldably connected via a pivot pin and that corresponds to the buttocks of the occupant. The lower seat back is connected to the lower end of the upper seat back so that the same seat back surface is formed together with the upper seat back. On the other hand, when the upper seat back is tilted backward from its standard position to the rearmost tilt position, the lower seat back is bent toward the rear side with respect to the upper seat back to form a rear end of the seat cushion. A seat device comprising a guide mechanism for guiding the movement of the lower seat back so as to retreat to a lower side of the seat cushion through a rear side.