JP2002345585A - Retractable seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ease the speed of inclining a seat back forward in a retractable seat which utilizes the seat back as a load carrier and a table by inclining it forward. SOLUTION: A rotation easing body (A) comprising an overlap or the like is provided at a point below rotary pivot parts (1A) and (1A) rotatably pivoted longitudinally on arms (3) and (3) which have a seat back(SB) sticking out from the side of a seat cushion(SC) to increase the mass of a lower part of the seat back(SB).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding seat for an automobile seat, and more particularly, to a folding seat which is tilted forward so that its backboard is upwardly horizontal when the seatback is not in use.

[0002]

2. Description of the Related Art Some seats for automobiles have an arm projecting upward from a seat cushion side, and a portion slightly above a lower end of a side frame of a seat back is supported so as to be able to fall forward.

[0003] Accordingly, the seat back can be used as a table or a bed by tilting the seat back forward with the backboard facing upward with the rotation center slightly above the lower end of the side frame. It is configured. Then, the seat is turned so that the lower side is directed upward from the center of rotation of the seat back and the upper side is directed downward, thereby keeping the entire backboard in a horizontal state.

[0004]

Therefore, in the seat having the above structure, the mass of the upper portion of the seatback is larger than that of the lower portion when the seatback is tilted forward.
It falls down sharply due to the weight of the upper part of the seat back.

[0005] In particular, in the case where a lock mechanism for holding the seat back in the forwardly leaning state and the use state is provided above the rotation center, the mass on the upper side of the seat back becomes larger, and the forward leaning is further increased. Speed increases.

[0006] Therefore, the conventional product has a problem that discomfort is caused because the front-back of the seatback falls sharply when the seat-back falls forward.

Accordingly, an object of the present invention is to alleviate the forward leaning speed of a retractable seat that can be used as a table or a bed by such forward leaning of a seat back.

[0008]

In order to achieve the above object, according to the present invention, a rotation alleviating member for alleviating the rotation speed of the seat back when the seat back is tilted forward is provided below the rotation supporting portion of the seat back. It is a configuration consisting of Therefore, the rotation speed of the seat back at the time of forward leaning can be reduced by the rotation alleviating body.

The rotation alleviating member is formed by a weight provided below the rotation supporting portion, so that the weight of the rotation alleviating member provided on the lower side of the seat back increases the weight of the seat when the seat falls forward. The forward leaning force on the upper side of the back is reduced, and the forward leaning speed of the seat back is reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a retractable seat according to the present invention, in which (1) is a back frame constituting a seat back, and this back frame (1) is composed of an upper frame (12) and left and right side frames (11) ( 11) and a lower frame (10).

The left and right side frames (11) (1)
In the lower part of (1), a rotary pivot (1A) (1
A) is formed, and an insertion hole (3) provided at the upper end of the arm (3) (3) is formed in the rotation attachment portion (1A) (1A).
By inserting the pivot pin (32) inserted in 1), the back frame (1) constituting the seat back (SB) is connected to the rotating pivot portion (1A) (1A) as shown in FIGS. It is pivotally supported by the arms (3) and (3) so as to be able to fall forward around the rotation center (a).

The arms (3) and (3) are a pair of right and left reclining devices (5) mounted on the rear side of the cushion frames (60) and (61) of the seat cushion.
It is configured to be fastened to the movable arm of (5) and to be tilted in the front-rear direction by the reclining devices (5) and (5). In the drawing, (50) indicates a connecting rod of the left and right reclining devices (5) and (5), (7) and (7) indicate seat slide devices, and (71) indicates an unlock lever of the seat slide device.

As shown in FIG. 2, the lower frame (10) is formed by bending a pipe into a substantially U-shape, and has a weight (A) made of a metal rod inserted therein. And the mass is large.

Therefore, since the lower frame (10) is located below the pivoting portions (1A) (1A) provided on the side frames (11) and (11), the pivoting portion is provided. (1A) When the back frame (1) is tilted forward around (1A) as the center of rotation, the lower side of the back frame (1) becomes heavier, so that it falls down gently.

If the weight of the lower portion of the back frame (1) is increased so as to reduce the forward falling speed of the back frame (1), for example, as shown in FIGS. A weight (B) made of a metal plate may be provided between the left and right brackets (13) (13) for attaching the backboard in the lower frame (10). The above-mentioned weights (A) and (B) are referred to as rotation relaxation bodies.

Also, a pin is projected from below the rotation pivot portion (1A) of the side frame (11), and a spring-made rotation alleviator (not shown) made of a tension coil spring is provided between the pin and the arm (3). Illustrated), and by the elasticity of this spring,
It is optional to reduce the forward falling speed.

In FIG. 1, (15) in FIG.
Back board (2) hooking wire shown in (16) ...
Indicates an S-shaped spring for supporting a foam pad (8) coated on a skin (9) shown in FIG.

Locking devices (4) and (4) are mounted on the upper portions of the arms (3) and (3), and the seats (SB) shown in FIG.
, The state before the seat back (SB) shown in FIG. 6 is set as a carrier, and the table state shown in FIG.

The illustrated lock devices (4) and (4) are lock pins (45) and (46) provided at the distal end of the arm (3).
(47) is configured to be locked by engagement of a locking claw of an operation lever (49) provided on one lock device (4), and the operation lever (49) is locked by the other lock device (4).
Connecting rod (42) for integrally connecting the locking claws (48)
The operation lever (49) and the locking claw (48) are connected to the ends of the arms (3) and (3) by the side frames (11).
(11) A fixed plate (41) rotatably clamped to
(41), and the fixing plate (41) is fastened to the fastening holes (14) (14) of the side frames (11) (11) by bolts (43) of the mounting piece (44). Fixed.

In the state of use of the seat back (SB) shown in FIG. 5, the arm (3) is rotated in the front-rear direction about the rotation center (b) by operating the reclining device. Can be tilted in the front-rear direction to adjust the seated person to a desired angle.

At this time, since the seat back itself does not rotate around the center of rotation (a), the rotation alleviating member (A) (A) provided below the back frame (1) of the seat back (SB). B) does not affect the tilting operation force of the seat back. (4A) in the figure shows a cover of the lock device (4).

When the backboard (2) side of the seat back (SB) is used as a carrier, the arm (3) is first tilted backward by the reclining device (5) as shown in FIG. After that, the seat back (S
Seat back (SB) centering on the rotation center (a) in B)
Is tilted forward so that the backboard (2) faces upward and horizontally. Thereby, luggage and the like can be placed on the back board (2).

When the seat back (SB) is turned forward and used as a carrier, as described above, since the rotation alleviating members (A) and (B) are provided in the lower part of the seat back (SB), the seat back (SB) is provided. SB) gradually falls forward and does not suddenly fall forward unlike the above-mentioned conventional products.

FIG. 7 shows a state in which the seat back (SB) is used as a table. The arm (3) is raised vertically by the reclining device (5) from the use state shown in FIG. ) Is tilted forward so that the backboard (2) is in an upward horizontal state.

In the case of the forward fall, since the rotation alleviating members (A) and (B) function effectively, the seat back (S
The falling speed of B) is gentle enough not to cause discomfort to the user. (5A) in the figure shows a cover of the reclining device (5).

[0026]

According to the present invention, the seat back is a carrier,
In a retractable seat that falls forward so that it can be used as a table, the forward leaning speed at the time of forward leaning can be reduced by the rotation relaxing body, so that the discomfort of the seatback at the time of forward leaning can be eliminated.

[Brief description of the drawings]

FIG. 1 is an exploded partial cutaway perspective view.

FIG. 2 is a sectional view showing a main part of the present invention.

FIG. 3 is a perspective view showing a main part of another embodiment of the present invention.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a side view showing a use state.

FIG. 6 is a partially cutaway side view in a state before a seat back is changed to a carrier.

FIG. 7 is a side view of a state in which the seat back is used as a table.

[Explanation of symbols]

 SB Seat back A Rotational relaxation body B Rotational relaxation body 1 Back frame 1A Rotation pivoting part 3 Arm 11 Side frame

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akifumi Sato 3-2-112 Matsubara-cho, Akishima-shi, Tokyo Inside Tachi-S Co., Ltd. (72) Inventor Satoshi Oki 3-2-1-12 Matsubara-cho, Akishima-shi, Tokyo Co., Ltd. TACHI-S F term (reference) 3B084 EB04 EC01 3B087 BA02 BD01 CB12 DB02 DB08 3B099 AA05 BA04 CA30 CB06 DA04

Claims (2)

[Claims] 1. A retractable seat provided with a pivotable portion which is supported on a side of a seatback so as to be capable of being tilted forward by an arm protruding from a seat cushion side. A retractable seat provided with a rotation alleviating body for lowering the rotation speed of the seat back when the seat back falls down. 2. The retractable seat according to claim 1, wherein the rotation alleviating member is a weight provided below the rotation attachment portion.