JP2001030812A - Folding seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a folding seat a full-flat state by inclining a sufficiently tall seat back forward to store it into a limited space generated by reversely turning a seat cushion to a forward side. SOLUTION: An upper arm 3 provided integrally with a seat back S2 is coupled to a lower arm 4 relatively rotatable about a rotation shaft 41 via a reclining mechanism, and one end of an arm lower part 5 of the lower arm 4 is coupled to a seat track 2 through a rotation shaft 51. One end of a link arm 6 is coupled to a lower end projection part 32 of the upper arm 3 through a rotation shaft 31, and the other end is coupled to the seat track 2 through a rotation shaft 61. When the seat back S2 is inclined forward, the upper arm 3 is rotated integrally with the seat back S2, thereby rotating the link arm 6 and the lower arm 4. With the rotation of the lower arm 4, a position of the rotation shaft 41 is moved backward, and the whose seat back S2 is moved backward with its forward inclination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable seat for a vehicle, and more particularly to an improvement in the structure of a foldable seat for a vehicle which can be folded in a full flat state.

[0002]

2. Description of the Related Art FIG. 12 shows an example of a conventional folding sheet. In FIG. 12, a seat track 91 is slidably provided on a parallel seat rail 1 (only one is shown) extending in the vehicle front-rear direction (the left-right direction in the figure), and the front end of the seat cushion S1 has two sides. Seat track 91
Is mounted on a bracket portion 92 formed at the front end of the vehicle by a rotating shaft 93, and is turned forward and backward as indicated by a chain line (arrow in the figure). The seat back S2 has a lower arm 82 provided at the rear end of the seat track 91 via a well-known reclining mechanism.
The rotation shaft 8 of the reclining mechanism is provided in a space created by reversing and rotating the seat cushion S1 forward.
The seat back S2 is indicated by a dashed line around
Forward (arrow in the figure). As a result, the back surface of the seat cushion S1 and the back surface of the seat back S2 are in a full flat state where they are flush with each other, and in this state, a long baggage or the like can be loaded into the vehicle interior.

[0003]

By the way, the height of the seat back tends to increase in order to support the entire back of the occupant and improve the comfort of the occupant. There is a problem in that the height of the seat back cannot be made sufficiently high because there is a limit to the length of the space created.

Accordingly, the present invention solves such a problem, and a fully tall seatback is stored in a limited space created by inverting and rotating a seat cushion forward and fully retracted. An object of the present invention is to provide a folding seat for a vehicle that can be in a flat state.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, the seat back (S2) is tilted forward in a space created by reversing and rotating the seat cushion (S1) forward. In a foldable vehicle folding seat,
An upper arm (3) and a lower arm (4) are connected to each other via a reclining mechanism so as to be relatively rotatable about a rotation axis (41), and the upper arm (3) is provided integrally with the seat back (S2). Lower arm (4)
Is rotatably connected to the vehicle floor side (2), and one end is rotatably connected to a part (32) of the upper arm (3) excluding the center of rotation with the lower arm (4). A link arm (6) is provided, the other end of which is rotatably connected to the vehicle floor side (2).

In the first aspect of the invention, when the lock of the reclining mechanism is released and the seat back is tilted forward, the upper arm rotates integrally with the seat back, and the link arm and the lower arm rotate accordingly. With the rotation of the lower arm, the position of the rotation axis of the upper arm moves, and the position of the entire seat back also moves. In the second aspect of the present invention, by appropriately setting the length and position of each of the above arms, the entire seat back is moved rearward as the seat is tilted forward, thereby causing the seat cushion to turn forward and reverse. In a limited space, a sufficiently tall seat back can be moved forward and stored in a fully flat state.

In the third invention, the link arm (6)
Of one end of the upper arm (3) and a part (32) of the upper arm (3) are connected to a slot (62) and a pin member (3) inserted therein.
A lock member (7) for controlling the rotation of the lower arm (4) at an appropriate rotation position is provided in addition to the operation (3).

In the third aspect of the invention, the same effect as that of the first aspect of the invention can be obtained in the second aspect of the invention by releasing the lock of the reclining mechanism and releasing the restriction of the rotation of the lower arm by the lock member. Can be In addition to this, by releasing the lock of the reclining mechanism in a state where the rotation of the lower arm is restricted, the upper arm can be rotated without moving the rotation shaft within a range in which the pin can move in the elongated hole. Therefore, the seat back can normally be in the reclining state without moving the rotation axis, and the rotation axis, that is, the entire seat back can be moved only when the seat back is stored forward. Further, when the seat is used with the rotation of the lower arm regulated at an appropriate position by the lock member, the load of the seat back is received by the lower arm and the lock member and does not act on the link arm, which is advantageous in strength. .

The reference numerals in parentheses indicate the correspondence with the specific means described in the embodiments described later.

[0010]

(First Embodiment) FIG. 1 shows a side view of a folding seat for a vehicle. In FIG. 1, a seat track 2 is slidably provided on a parallel seat rail 1 (only one of which is shown) extending in the vehicle front-rear direction (left-right direction in the drawing), and a seat cushion S1 has both front end sides. And a bracket 21 projecting obliquely forward from the front end of the seat track 2.

The seat back S2 has an upper arm 3 provided at a lower end portion of a side surface thereof, which is connected to a lower arm 4 via a known reclining mechanism (not shown). The upper arm 3 and the lower arm 4 are provided with an operation lever (not shown). By the operation, the lower arm 4 can be relatively rotated around the rotation shaft 41 located at the center of the circular upper portion 42 and can be locked at a desired rotation position. Thereby, the seat back S2 can be tilted to a desired position.

The lower arm 4 is composed of a circular upper part 42 and an arm lower part 5 which is pin-connected at the left and right positions of a connecting part 43 extending downward from the circular upper part 42. The arm lower part 5 is formed in a substantially inverted triangular frame shape, extends diagonally forward and downward, and has a lower end having a rotating shaft 5 at the upper edge of the seat track 2.
They are joined by 1.

One end of the long plate-shaped link arm 6 is connected to the rear end of the seat track 2 by a rotation shaft 61, and the other end of the link arm 6 extending upward crossing the arm lower part 5 is Lower end protruding portion 32 of upper arm 3
Are connected by a rotating shaft 31. Note that points A, B, C, and D in FIG. 1 are on an arc locus centered on the rotation axis 51, and the seat back S is at a normal seat use position.
The rotation shaft 41 which is the tilting center of 2 is at the position A.

In the folding sheet having such a structure,
When the seat cushion S1 is folded to the full flat state, the seat cushion S1 is turned forward around the rotation shaft 22, and then the lock of the reclining mechanism is released, and the seat back S2 is moved forward. As the seat back S2 falls forward, the upper arm 3 rotates counterclockwise in FIG. 1 around the rotation shaft 41, and the link arm 6 rotates clockwise in FIG. Along with this, the lower arm 5 once rotates in the counterclockwise direction in FIG. 1 as a whole about the rotation shaft 51, and the position of the rotation shaft 41 moves to the D position. This is shown in FIG. When the seat back S2 is further moved forward, the lower arm 5 is inverted and rotates clockwise. When the seat back S2 is moved forward to the horizontal posture, the position of the rotation shaft 41 moves to the position B. This is shown in FIG. Rotating shaft 41
With the movement of the seat back, the seat back S2 moves forward and downward as a whole, and falls forward, and is stored in the space created by inverting the seat cushion S1, and its back surface is continuous with the back surface of the seat back S2. It becomes a full flat state.
At this time, as described above, since the seat back S2 is moved rearward as a whole, even if the height of the seat back S2 is sufficiently high, the seat back S2 is stored forward without any problem in the space created by inverting the seat cushion S1. You.

Further, in the folding seat having such a structure, when the seat back S2 is lowered from the use state of the seat shown in FIG. 1 and used as a bed, the link arm 6 and the lower arm 5 are associated with the lowering of the seat back. Rotating clockwise in FIG. 1 around the rotating shafts 61 and 51 respectively, the rotating shaft 41 moves from the position A to the position C, and the state shown in FIG. 3 is obtained. In this state, the seat back S2 moves slightly rearward and downward as a whole. Therefore, compared to the case where the seat back S2 inclines backward as it is at the position A in FIG.
It is possible to smoothly continue the surface of the bed without generating a step, and the bed can be used comfortably.

Further, when the folding seat having the above structure is used as a front seat, when the seat back S2 is tilted slightly forward from the seat use state of FIG. With the clockwise rotation, the link arm 6 rotates clockwise in FIG. 1 around the rotation shaft 61, and the lower arm 5 rotates counterclockwise in FIG. Then, the rotating shaft 41 moves from the position A to the position D. This is shown in FIG. 4, and since the seat back S2 moves forward and upward as a whole, it is possible to smoothly enter the rear seat.

(Second Embodiment) FIG. 5 shows another embodiment of the present invention. In FIG. 5, the circular upper portions of the upper arm and the lower arm are not shown. In the present embodiment, an elongated hole 6 extending in the longitudinal direction is provided at the upper end of the link arm 6.
2, a pin 33 provided on the lower end protruding portion 32 (see FIG. 1) of the upper arm is located in the elongated hole 62. The lower arm portion 5 of the lower arm is formed in a substantially inverted triangular plate shape, and pins 52, 53, and 54 are erected in the middle of the plate surface at intervals in the vertical direction. The pin 54 has a smaller diameter than the other pins 52 and 53.
The lock plate 7 has its lower end coupled to the seat track 2 by a common rotation shaft 61 with the link arm 6,
Notches 71 and 72 are formed in the side edges at upper and lower positions. The notch 71 is large enough to accept the pins 52 and 53, and the notch 72 is small enough to accept only the pin 54. The lock plate 7 is urged to rotate counterclockwise in FIG. 5 by a spring member (not shown).

In the normal seat use state shown in FIG. 5, the pin 52 enters into the notch 71 of the lock plate 7, and the rotation of the lower arm 5 about the rotation shaft 51 is restricted and fixed. In this state, the tilt of the seat back S2 about the rotation axis 41 when the lock of the reclining mechanism is released can be freely made within a range in which the pin 33 can move in the elongated hole 33.

When the seat cushion S1 is folded to the full flat state, as shown in FIG. 6, the seat cushion S1 is turned forward around the rotation shaft 22, and then the lock of the reclining mechanism is released. Up to the lower end of the seat back. Next, the lock plate 7 is rotated clockwise to disengage the pin 52 from the notch 71, and the forward movement of the seat back S2 is started (FIG. 7). When the seat back S2 is further moved forward, as shown in FIG. 8, the link arm 6 and the arm lower part 5 are rotated largely clockwise around the rotation shafts 61 and 51 with the forward movement of the seat back S2, respectively. The seat back S2 moves rearward (right in FIG. 8) as a whole.

In this state, the pin 54 enters the notch 72 and the rotation of the arm lower part 5 is restricted. When the seat back S2 is further tilted forward, the pin 33 is moved into the elongated hole 62 as shown in FIG. , The seat back S2 is stored in the space created by the reversal of the seat cushion S1, and the back surface thereof is in a full flat state that is continuous with the back surface of the seat back S1. At this time, as described above, since the seat back S2 is moved rearward as a whole,
Even if the height of the seat cushion S1 is sufficiently high, the seat cushion S1 is stored forward without any problem in a space formed by inverting the seat cushion S1.

The seat back S from the seat use state of FIG.
The seat back S2 can be retracted and used as a bed. In this case, the lock of the reclining mechanism is released and the seat back S2 is retracted until the pin 33 reaches the upper end of the elongated hole 62 (FIG. 10). After that, the lock plate 7 is rotated clockwise to release the pin 52 from the notch 71, and FIG.
As shown in (5), the arm lower part 5 is rotated clockwise around the rotation axis 51, and the pin 53 is advanced into the notch 71 of the lock plate 7, thereby restricting the rotation of the arm lower part 5. As a result, the seat back S2 moves slightly rearward and downward as a whole, and moves from the surface of the seat cushion S1 to the seat back S2.
It can be used smoothly as a bed smoothly and continuously without a step on the surface of the bed.

In this embodiment, the rotation shaft 41 is moved within a range in which the pin 33 can move in the long hole 62 by releasing the lock of the reclining mechanism while the rotation of the lower arm 5 is restricted. Since the upper arm can be rotated without moving the rotary shaft 41, the seat back S2 can be normally in a reclining state without moving the rotary shaft 41, and the rotary shaft 41, that is, the entire seat back S2 is moved only when the seat back S2 is stored forward. Can be done. In particular, since the load from the seat back S2 in the normal seat use state shown in FIG. 5 and the bed state shown in FIG. 11 is received by the arm lower part 5 and the lock plate 7 and does not act on the link arm 6, the strength is reduced. It is more advantageous.

[0023]

As described above, according to the folding seat for a vehicle of the present invention, a sufficiently tall seat back is moved forward and stored in a limited space created by inverting and rotating the seat cushion forward. To a full flat state.

[Brief description of the drawings]

FIG. 1 is an overall perspective side view of a folding sheet showing one embodiment of the present invention.

FIG. 2 is an overall perspective side view showing an operation state of a folding sheet.

FIG. 3 is an overall transparent side view showing an operation state of a folding sheet.

FIG. 4 is an overall perspective side view showing an operation state of the folding sheet.

FIG. 5 is an overall perspective side view of a folding sheet showing another embodiment of the present invention.

FIG. 6 is an overall perspective side view showing an operation state of the folding sheet.

FIG. 7 is an overall perspective side view showing an operation state of the folding sheet.

FIG. 8 is an overall transparent side view showing an operation state of the folding sheet.

FIG. 9 is an overall perspective side view showing an operation state of the folding sheet.

FIG. 10 is an overall transparent side view showing an operation state of the folding sheet.

FIG. 11 is an overall transparent side view showing an operation state of the folding sheet.

FIG. 12 is a schematic perspective side view of a conventional folding sheet.

[Explanation of symbols]

S1: Seat cushion, S2: Seat back, 1: Seat rail, 2: Seat track, 3: Upper arm,
32: lower end protrusion, 33: pin, 4: lower arm, 41
... Rotating axis, 5 ... Arm lower part, 6 ... Link arm, 62 ...
Slot, 7 ... Lock plate.

Claims (3)

[Claims] 1. A vehicular foldable seat that can be folded forward by folding a seat back forward in a space created by reversing and rotating a seat cushion to the front so as to be relatively rotatable about a rotation axis via a reclining mechanism. An upper arm and a lower arm coupled to each other, the upper arm being integrally provided with the seat back, one end of the lower arm being rotatably connected to a vehicle floor, and one end excluding a center of rotation with the lower arm. A folding seat for a vehicle, comprising a link arm rotatably connected to a part of the upper arm and the other end rotatably connected to a vehicle floor side. 2. The vehicle according to claim 1, wherein when the upper arm is rotated forward with respect to the lower arm, the lower room is rotated rearward with respect to a vehicle floor. Folding sheet. 3. A lock for connecting one end of the link arm to a part of the upper arm by an elongated hole and a pin member inserted therein, and restricting the rotation of the lower arm at an appropriate rotation position. The vehicle foldable sheet according to claim 1, further comprising a member.