JPH031172B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a seat device for an automobile, and more particularly, to a conventional technology relating to a seat device equipped with a mechanism in which a seat back is folded into a so-called two-fold state. For example, as a seat device equipped with a mechanism that brings about the state
There is one shown in Publication No. 131306.

As shown in FIG. 5, this seat device includes a base plate 2 fixed to a seat cushion 1, a back arm 4 fixed to a seat back 3, an operating lever 5, and a known reclining mechanism. By rotating the seat back 5 in the A direction, the inclination angle of the back arm 4 and thus the seat back 3 can be adjusted in multiple stages between the O position and the P position.

Further, the back arm 4 is composed of a lower arm 6 and an upper arm 7, and the upper arm 7 is pivotally supported by a pin 8 to the lower arm 6, and normally the lower arm 6 and the upper arm 7 are in a straight line (the solid line in Fig. 5). It is locked by the lock lever 9 so that it is in the state shown in FIG.

Then, the operating lever 5 is rotated in the A direction to rotate the back arm 4 to the forward tilted position of the Q position. At this time, the lower arm 6, upper arm 7, and lock lever 9 rotate as one. Thereafter, by returning the operating lever 5 to its original position, the lock lever 9 is rotated clockwise by a predetermined amount to release the locked state between the lower arm 6 and the upper arm 7. As a result, the upper arm 7 can be rotated about the pin 8 to the horizontal position of the R position.

In other words, by rotating the upper half of the seat bag to a horizontal position where it overlaps the seat cushion, resulting in a so-called two-step folded state, the back surface of the seat bag can be used, for example, as a table.

Problems to be Solved by the Invention By the way, in two-door cars, for example, seats equipped with a walk-in mechanism are used to make it easier for rear seat passengers to get in and out of the vehicle. This walk-in mechanism has a structure in which when the seatback is tilted forward, the seat slide is simultaneously unlocked and the entire seat is moved to its maximum forward position by the force of a spring.

When attempting to add the above-mentioned two-step folding function to such a seat with a walk-in mechanism, the following problems arise.

As mentioned above, in order to fold the seat back into what is called a two-step fold, it is necessary to tilt the seat back forward beforehand. Therefore, as long as the seat back is in the two-step folded state, the seat back is always in the forward-tilted position on the operating mechanism. It turns out that there is. When the seat back is tilted forward, it also means that the walk-in mechanism is unlocked, so when the seat back is folded in two steps, the entire seat always walks in to the maximum forward position. I'll have to move.

In other words, the lock remains unlocked in the walk-in state, and even if the seat bag is folded in two stages, the seat itself cannot be locked in any desired position and cannot be effectively used as a table or the like. In this case, although the seat is stopped at the maximum forward position, it is not locked, so it is unstable as a table, etc., and is also extremely far away.

Additionally, in order to lock the seat in an arbitrary position, it is possible to deal with this by providing a locking mechanism separate from the locking mechanism of the walk-in mechanism (seat slide mechanism), but this would complicate the structure and require two steps. This requires a lot of manipulation, which is not practical.

The present invention aims to provide a seat device that solves these problems.

Means for Solving the Problems According to the present invention, a walk-in operation and a two-step folding operation of the seat back can be performed by operating one lever, and when the seat back is folded in two steps, the seat back is in the walk-in state. The structure is such that the seat can be locked at will by releasing the lock.

Specifically, the back arm includes a base plate fixed to the seat cushion of a seat having a walk-in mechanism, a lower arm rotatably supported by the base plate, and an upper arm rotatably supported by the lower arm. ,
a reclining mechanism that adjusts the inclination angle of the back arm with respect to the base plate; a lock lever supported by the base plate that restricts and locks rotation of the upper arm with respect to the lower arm; and a lock lever that is connected to the operation system of the walk-in mechanism to allow the forward tilting movement of the back arm. The unlocked state of the walk-in mechanism is released when the upper arm is released from the locked state by the lock lever or when the upper arm rotates relative to the lower arm. A walk-in lever, a walk-in lever that releases the locked state of the upper arm by the lock lever in conjunction with an operation lever described later, and independently releases the locked state of the back arm by the reclining mechanism and the locked state of the upper arm by the lock lever. and an operating lever.

Effects According to the present invention, the back arm, that is, the seat back, can be tilted backward or forward by disengaging the reclining mechanism by rotating the operating lever. When the back arm is tilted forward, the walk-in mechanism is unlocked due to the function of the walk-in lever, and the entire seat is walked in, while the operating lever is held at its rotational position.

By returning the operating lever to its initial position from this state, the lock lever releases the lock lever's restriction on the upper arm, allowing the upper arm to rotate independently, allowing for so-called two-stage bending. . At this time, the walk-in lever also returns to its initial position to release the unlocked state of the walk-in mechanism, so that the walk-in mechanism becomes lockable again.

Therefore, the seat can be locked in any position even though the seat bag is folded in two stages.

Embodiment FIGS. 1 to 3 are diagrams showing a first embodiment of the present invention.

In FIGS. 1 and 2, 10 is a base plate fixed to the seat cushion, 11 is a back arm fixed to the seat back, and the back arm 11 is rotatably supported with respect to the base plate 10 by a rotating shaft 12. ing.

On the rotating shaft 12, there is a walk-in-off lever 1.
3, walk-in lever 14 and spiral spring 1
5 are arranged. One end of the spiral spring 15 is fixed to the rotating shaft 12, and the other end is fixed to a pin 16 on a lower arm 37, which will be described later, and always applies a biasing force to the back arm 11 in the counterclockwise direction in FIG. ing. The back arm 11 has a structure in which its inclination angle can be adjusted in multiple stages between a flat position P and an upright position O by the function of a reclining mechanism which will be described later.

The base plate 10 is provided with an operating lever 18 that rotates about a shaft 17 as well as a tooth plate 20 that rotates about a shaft 19.

The operating lever 18 has a pin 2 equipped with a roller 21.
2 is provided in a protruding manner, and this pin 22 moves along an elongated hole 23 formed in the base plate 10 in response to rotation of the operating lever 18. The roller 21 comes into contact with the cam surface 24 of the tooth plate 20, and the operating lever 18 is biased counterclockwise in FIG. 1 by a coil spring 25. Therefore, the roller 21 is the tooth plate 2.
0 in the clockwise direction, so that the tooth portion 26 of the tooth plate 20 and the tooth portion 27 formed on the back arm base (more specifically, the lower arm base to be described later) are engaged with each other.

As described above, the tooth portion 26 of the tooth plate 20 operated by the operating lever 18 and the tooth portion 27 on the back arm side constitute a reclining mechanism, and both tooth portions 26 and 27 are in an engaged state. is the locked state of the reclining mechanism. Then, by rotating the operating lever 18 to the unlock position M, the pressing force applied by the roller 21 to the tooth plate 20 is released, and the tooth portions 26, 27 are released.
The engagement between them is released and the state becomes unlocked.

A rotatable auxiliary lever 28 is provided at the bottom of the operating lever 18. One end of the auxiliary lever 28 abuts the pin 22, while the other end is connected to a grip 30 via an intermediate rod 29. In other words, the operating lever 18 and the auxiliary lever 2
8 is linked, and in addition to directly operating the operating lever 18, the operating lever 18 can also be rotated by pulling the grip 30.

The walk-in-off lever 13 has a link 31
while being connected to the operating lever 18 via
The walk-in lever 14 is connected to a lock lever 34 of a walk-in mechanism 33 via a wire 32. 35 is a slide rail of the walk-in mechanism 33, and 36 is an operating lever.

Note that the walk-in lever 14 includes an upright portion 14a, and is normally located at the S position.

The back arm 11 is composed of a lower arm 37 and an upper arm 39 rotatably supported on the upper end of the lower arm 37 by a pin 38. Further, the lock lever 40 and the assist lever 41 are arranged so as to overlap with the lower arm 37.
is arranged, and the lock lever 40 is connected to the rotating shaft 1.
2 is rotatably supported.

The lock lever 40 has a pin 43 shown in FIG.
Notch grooves 37a and 39a are formed at the upper end of the lower arm 37 and the lower end of the upper arm 39, respectively. These cutout grooves 37a, 39a engage with the pin 43 as shown in FIG.

The assist lever 41 is rotatably supported by a pin 44 protruding from the lower arm 37.
As shown in the figure, a long hole 45 formed in a portion thereof engages with a pin 46 formed in the lock lever 40. The assist lever 41 has a pressing surface 41 corresponding to the upright portion 14a of the walk-in lever 14.
It is equipped with a. 47 is a coil spring stretched between the lock lever 40 and the assist lever 41;
48 is a support for the assist lever 41.

The seat device configured as described above operates as follows.

First, to adjust the inclination angle of the seat back in the seated state, when the operating lever 18 is rotated in the clockwise direction in FIG. Therefore, the tooth part 2
The engagement between 6 and 27 is released. By tilting the seat back forward or backward in this state, the inclination position of the seat back can be adjusted in multiple stages between the fully flat position P and the upright position O.

When the operating lever 18 is released at the desired tilted position of the seat back, the operating lever 18 returns to the initial position L by the action of the coil spring 25, and the teeth 26 and 27 engage with each other again to lock the reclining mechanism. Become.

Next, when folding the seat back in so-called two steps, by rotating the operating lever 18 in the clockwise direction in FIG. The walk-in-off lever 13 is rotated counterclockwise. As a result, the back arm 11 rotates together with the lock lever 40 and the assist lever 41 to the forward tilted position Q in FIG. 1 due to the action of the spiral spring 15.

During this rotation process of the back arm 11, the pin 50 of the lock lever 40 is moved to the walk-in-off lever 13.
The operation lever 18 rotates counterclockwise until the pin 22 comes into contact with the inside of one end of the elongated hole 23.
It acts to rotate the clockwise direction.

Similarly, during the rotation process of the back arm 11, the pressing surface 41a of the assist lever 41 comes into contact with the upright portion 14a of the walk-in lever 14, and the walk-in lever 14 rotates counterclockwise. As a result, the lock bar 34 of the walk-in mechanism 33 is pulled through the wire 32, and the lock state of the walk-in mechanism 33 is released. This causes the entire seat to walk in to the maximum forward position.

When the back arm 11 is rotated to the forward tilted position Q, the walk-in/off lever 13 is moved to the operating lever 1 via the link 31 as described above.
8, the operating lever 18 is held at the unlocked position M. Therefore, the meshing between the teeth 26 and 27 remains released.

Subsequently, when the operating lever 18 is returned to the lock position L, the walk-in-off lever 13 rotates clockwise via the link 31 and comes into contact with the pin 50. As a result, the lock lever 40 is in the lock position.
Rotate from R ₁ to unlocked position R ₂ .

This rotation of the lock lever 40 disengages the pin 43 from the notched grooves 37a, 39a, and the locking state of the upper arm 39 by the lock lever 40 is released. Therefore, the upper arm 39
can be rotated to horizontal position _R3 . This state is a so-called two-step fold state.

Furthermore, when the lock lever 40 is rotated, the assist lever 41 is pulled by the lock lever 40 and rotates counterclockwise about the pin 44. And this assist lever 41
Following this, the walk-in lever 14 rotates clockwise, and the unlocked state of the walk-in mechanism 33 is released. In other words, at this time, the entire seat is at the maximum forward position, and the walk-in mechanism 3
3 is regardless of the movement of the walk-in lever 14.
Locking and unlocking operations can be performed independently using the operating lever 36. Therefore, the seat can be locked in any position even though the seat bag is folded in two stages as described above.

Further, when restoring the seat bag that has been folded in two stages, the upper arm 39 is rotated clockwise so that the notch groove 39a and the pin 43 are engaged, and the seat bag is locked again by the lock lever 40.

Incidentally, when performing the reclining operation and the two-step folding operation, the operation will be the same as described above even if the grip 30 is used instead of the operating lever 18.

FIG. 4 shows a second embodiment of the present invention, in which an assist lever 41A is integrated with an upper arm 39, and the assist lever 41A is configured to rotate together with the upper arm 39 about a pin 44. The other points are the same as the first embodiment.

This works in the same manner in this embodiment, but when the upper arm 39 is folded in two steps as shown in FIG. 4, the assist lever 41A protrudes from the back of the seat back.

Effects of the Invention As described above, according to the present invention, the walk-in operation and the so-called two-step folding operation of the seat back can be performed by operating one operating lever 1, and when the seat back is folded in two steps, the walk-in operation can be performed. Since the lockable state of the mechanism is released, the seat can be locked in any position even when the seat bag is folded in two stages.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a first embodiment of the present invention,
Figure 2 is the right side view of Figure 1, Figure 3 is the F of Figure 1.
4 is a cross-sectional view taken along line -F, FIG. 4 is an explanatory view of a main part showing a second embodiment of the present invention, and FIG. 5 is an explanatory view of a conventional seat device. 10...Base plate, 11...Back arm, 13...Walk-in-off lever, 14...
Walk-in lever, 18... Operation lever, 20
... Tooth plate, 26, 27 ... Teeth, 32
...Wire, 33...Walk-in mechanism, 37...
...Lower arm, 39...Upper arm, 40...
…Lots Clever.

Claims (1)

[Claims] 1. A back arm consisting of a base plate fixed to the seat cushion of a seat having a walk-in mechanism, a lower arm rotatably supported by the base plate, and an upper arm rotatably supported by the lower arm, and A reclining mechanism that adjusts the inclination angle of the back arm; a lock lever supported by the base plate that restricts and locks the rotation of the upper arm relative to the lower arm; and a lock lever that is connected to the operation system of the walk-in mechanism and is linked to the forward tilting movement of the back arm. A walk-in device that releases the locked state of the walk-in mechanism when the lock lever releases the lock state of the upper arm or when the upper arm rotates with respect to the lower arm. a lever, an assist lever that presses the walk-in lever at the same time as the back arm is tilted forward or releases the upper arm simultaneously with the rotation of the upper arm, and a walk-in off lever that releases the locked state of the upper arm by the lock lever in conjunction with an operating lever to be described later. and an operating lever for independently releasing the locked state of the back arm by the reclining mechanism and the locked state of the upper arm by the lock lever.