JP2592184Y2 - 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, the seat back includes an upper seat back constituting a backrest portion of an occupant, and a lower seat back adapted to correspond to the buttocks of the occupant. And the upper seat back is rotatably supported on the rotation fulcrum shaft, while a lower end of the upper seat back and an upper end of the lower seat back are pivoted by a pivot pin disposed on the front side of the seat back. At the position corresponding to the pivot pin on the back of the seat back, the pivot pin is centered. A concave portion is formed to allow the upper seat back and the lower seat back to be bent, and the lower seat back is moved to a lower end portion of the upper seat back at a standard position of the seat back where the upper seat back is in an upright state. 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. And a guide mechanism for guiding the movement of the lower seat back so as to bend to the rear side of the seat back and to retreat to the lower side of the seat cushion through the rear side of the rear end of the seat cushion. And

[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 in accordance with the backward tilting operation of the upper seat back, and the seat cushion is bent toward the rear side around the pivot pin on the front side of the seat back. By being moved to the lower surface side through the rear side of the rear end portion, the interference between the lower seat back and the seat cushion is reliably avoided. Moreover, in this case, a concave portion is formed on the back side of the pivot pin connecting the upper seat back and the lower seat back to allow the lower seat back to bend toward the rear side with respect to the upper seat back. Therefore, the upper seat back and the lower seat back do not interfere with each other, and the lower seat back can be smoothly bent.

Further, when the seat back is tilted between the standard position and the rearmost tilt position and the upper seat back and the lower seat back are bent rearward,
Since the pivot pins connecting them are located on the front side of the seat back, the upper seat back and the lower seat back maintain a continuous state on the front side of the seat back regardless of the position of the tilt range. Thus, no gap is formed between them, so that the lower seat back can secure the occupant's buttocks at the middle tilting position, for example, and the design of the seat back itself can be improved.

[0012]

[Effect of the Invention] Therefore, according to the seat device of the present invention,
Regardless of the tilting operation of the seat back, the relative position between the occupant support point in the upper seat back and the occupant's backrest point with respect to this can always be kept constant, so that the occupant does not feel a feeling of oppression on the back and sits down Feeling is improved.

Further, the upper seat back and the lower seat back are always continuous at the front of the seat back regardless of the tilting position of the seat back, so that no gap is formed between the seat back and the seat cushion. Therefore, for example, a gap is generated between the seat back and the seat cushion as in the related art, which reduces the support performance of the occupant's buttocks and does not become a limiting factor in the design. It can achieve both design and practical performance.

[0014]

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.

As shown in FIGS. 1 and 6, the seat back 2 includes an upper seat back 3 which will be described later, which constitutes a backrest portion of the occupant M, and a lower seat back 4 which corresponds to the rear end of the occupant M. It has a two-part structure. The upper seat back 3 has a “U-shaped” upper seat back frame 11 attached to a support bar 13 horizontally disposed at a lower end thereof, and an appropriate pad is provided outside the upper seat back frame 11. It is configured by attaching members. Further, as shown in FIG. 1 and FIG.
Both end portions are made to protrude into the inside of the side wall members 5, 5 and swing levers 14, 14 each having a predetermined length are fixed to the protruding ends. 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 end of a lock mechanism 20 attached to the inside of the side wall member 5 via a bracket 22 is connected to one of the pair of swing levers 14, 14.

Therefore, the upper seat back 3 releases the lock operation of the lock mechanism 20 by operating the lock operation knob 21 provided on the front surface of the side wall member 5.
The pivots 15 and 15 can be tilted in the front-rear direction with the pivots 15 and 15 as pivot axes. As shown in FIG. 3, a standard position where the upper seat back 3 is substantially upright and a rear side of the seat cushion 1. A predetermined tilting is possible by stopping the operation of the lock operation knob 21 and putting the lock mechanism 20 in a locked state, while being able to tilt between two upper and lower positions of a last tilt position that is tilted rearward so as to extend. The posture is held at the position.

Further, at the lower end of the upper seat back 3, an inclined surface portion 31 which is inclined upward from the lower end on the front surface 4b side toward the back surface 3a in order to allow relative bending with a lower seat back described later. A pair of left and right brackets 1 attached to the support bar 13 is formed at the lower end of the inclined surface portion 31 which is formed and is connected to the front surface 3b.
7, 17 are protrudingly arranged. 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.

By the way, 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 the state, the lower end of the upper seat back 3 (that is, the lower end of the inclined surface portion 31)
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 in a state where the upper seat back 3 is set to the most inclined position. Is appropriately set such that the lower end of the upper seat back 3 is close to the rear end of the seat cushion 1 as shown in FIG. A gap formed between the upper seat back 3 and the seat cushion 1 is covered over the entire range of the tilting range of the upper seat back 3, and a lower seat back, which will be described later, in order to surely support the occupant's hips. Further, a guide mechanism X described below is provided to prevent the lower seat back 4 from interfering with the seat cushion 1 when the upper seat back 3 is tilted.

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 described above, and as shown in FIGS. 1, 2 and 6. Lower seatback frame 1 composed of a curved plate
2 and a suitable pad member is arranged outside the lower seat back frame 12. In this case, the rear surface 4a is replaced with the front surface 4b to allow the upper seat back 3 to bend. And a pair of left and right brackets 1 fixed to the lower seat back frame 12 at a continuous portion of the inclined surface portion 41 and the front surface 4b.
8, 18 are projected. The lower seat back 4 connects the pair of left and right brackets 18, 18 to the pair of left and right brackets 17, 17 on the upper seat back 3 side.
By connecting to the upper seat back 3 with the pivot pin 19 on the front side of the seat back as a center of bending, it is possible to bend to the rear side of the upper seat back 3. It is supported as it is.

As shown in FIG. 3, the lower seat back 4 constructed as described above and connected to the lower end of the upper seat back 3 in a bendable manner has the upper seat back 3 set at a standard position. In the state in which the upper seat back 3 is in contact with the lower end of the upper seat back 3,
b and the front surface 4b of the lower seat back 4 constitute a continuous front surface of the seat back, 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 the posture during use). In this use posture, a wedge-shaped concave portion 30 is formed on the back side of the pivot pin 19 by the inclined surface portion 31 of the upper seat back 3 and the inclined surface portion 41 of the lower seat back 4.

On the other hand, as shown in FIG. 5, in a state where the upper seat back 3 is set at the rearmost inclined position, the lower seat back 4 is centered on the pivot pin 19 and the back of the upper seat back 3. Bent to the side and its inclined surface 4
1 is retracted to the lower surface of the seat cushion 1 with the front surface 4b of the upper seat back 3 approaching the inclined surface 31 and the front surface 4b of the upper seat back 3 approaching the rear end 1a of the seat cushion 1. The interference between the seat back 4 and the upper seat back 3 and the interference between the lower seat back 4 and the seat cushion 1 are both avoided (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 is moved between the use posture and the retracted posture in accordance with the rotational position of the upper seat back 3, so that the space between the seat back 2 and the seat cushion 1 is moved. The seat back 2 can be reclined without forming a gap, and the operation of the lower seat back 4 is realized by a guide mechanism X described later.

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 changes between the use posture and the retracted posture in accordance with the tilt of the upper seat back 3. According to the seat apparatus Z provided with the seat back 2 to be controlled, when the seat back 2 is tilted between its standard position and the last tilted position, the lower seat back 4 is moved upward in the entire tilting range. Since there is a gap between the seat back 3 and the seat cushion 1 to prevent a gap from being formed therebetween, for example, a structure in which a gap is formed between the seat back 2 and the seat cushion 1 as in the above-described known example. As compared with the case of the above, the appearance is improved and the design is improved, and the bottom of the occupant M is securely supported by the lower seat back 4, so that the feel when sitting is reduced. In which the ring is crimped if more favorable.

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. Therefore, the relative position in the seat vertical direction between the backrest point of the occupant M and the occupant M support point of the upper seatback 3 is maintained substantially constant regardless of the tilt of the seatback 2, and M can be reliably prevented from giving unnecessary pressure to M and causing wrinkles in the clothes.

[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.

FIG. 6 is an exploded perspective view of the seat back 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, 31 is an inclined surface,
41 is an inclined surface portion, 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. Wherein the seat back has a two-part structure of an upper seat back constituting a backrest portion of an occupant and a lower seat back adapted to correspond to the buttocks of the occupant, and the upper seat back is provided on the pivot shaft. While pivotally supported, the lower end of the upper seat back and the upper end of the lower seat back are connected to each other by a pivot pin disposed on the front side of the seat back so as to be bendable with each other. At a position corresponding to the pin, a concave portion is formed to allow the upper seat back and the lower seat back to be bent around the pivot pin, Further, in the standard position of the seat back in which the upper seat back is set up, the lower seat back is made continuous with the lower end of the upper seat back to form the same seat back surface together with the upper seat back, When the upper seat back is tilted rearward from its standard position to the rearmost tilt position, the lower seat back is bent toward the back side with respect to the upper seat back, and the rear side of the rear end of the seat cushion is bent. A seat mechanism provided with 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 the seat cushion.