JPH0434401B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reclining device provided in a vehicle seat.

[Conventional technology]

2. Description of the Related Art Seats in automobiles and the like are equipped with reclining devices that adjust the inclination angle of the seat back so that a seated person can assume a desired sitting posture.

Conventionally, this reclining device has been disclosed, for example, in Japanese Patent Publication No. 49-48691. That is, in this reclining device, a toothed annular plate with teeth cut on the inside is attached to the seat back side, and a toothed circular plate with teeth cut on the outside is attached to the seat cushion side. The number of teeth is at least 1 greater than the number of teeth on the toothed annular plate.
A portion of this toothed disc meshes with the toothed annular plate, and the toothed annular plate is rotatably supported by the eccentric ring part of the shaft with an eccentric ring, and the toothed disc is rotatably supported by the shaft part. By rotating this eccentric shaft with an operating member, the toothed annular plate is rolled around the toothed disc. The angle of inclination of the seat back is adjusted by rotating the annular plate by the ratio of the number of teeth to the toothed disk.

[Problem that the invention seeks to solve]

However, in the conventional reclining device of this type, since the center of the hinge is in a fixed position, in the so-called full reclining state where the seat back Sb is laid down approximately horizontally with respect to the seat cushion Sc as shown in Fig. 7, the seat cushion Sc A step a corresponding to the thickness of the seat back Sb is created between the seat back Sb and the seat back Sb. For this reason, there was a drawback that the seated person felt uncomfortable.

In order to solve this problem, a seat with the hinge position set downward may be considered, but in this case, the center of the hinge will be located at the rear of the seat cushion, so as the seat back tilts backward, the seat will be seated. The distance between the person's back and the seat back changes significantly, which causes the inconvenience that the seated person cannot enjoy a comfortable sitting experience.

The present invention has been made in view of the above, and an object of the present invention is to provide a reclining device that does not create a step between the seat cushion and the seat back when fully reclined.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention has a base plate 2 as a fixed member fixed to the side rear end of the seat cushion Sc, and a seat cushion side arm 4 as a first rotating arm in the up-and-down direction. A seat bag side arm 6 serving as a second rotating arm rotatably pivoted to the seat cushion side arm 4 and connected to the seat bag Sb,
It is connected so as to be rotatably adjustable in the up-and-down direction via a rotation adjustment mechanism 7, and furthermore, an engagement pin 16 is provided at the extension end 6a of the seat bag side arm 6 on the connection side to the seat cushion side arm 4. The engagement pin 16 is engaged with an elongated hole 17 formed in the base plate 2 facing toward the pivot portion of the seat cushion side arm 4.

[Effect]

The measures described above operate as follows.

When the seatback side arm 6 is rotated in the direction of lodging with respect to the seat cushion side arm 4 by the rotation adjustment mechanism 7 from the state where the seatback Sb is in the neutral position, the seatback side arm 6
By engaging the engagement pin 16 in the elongated hole 17 of the base plate 2, as the seat bag side arm 6 rotates with respect to the seat cushion side arm 4, the connecting portion between both arms 4 and 6 is moved relative to each other. In other words, the center position of the hinge is changed, so that the center of the hinge of the seat bag Sb is lowered, and the seat bag Sb is laid flat with respect to the seat bag Sc.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6.

In the figure, 1 shows the entire reclining device of the present invention, 2 is a base plate of the reclining device 1, and mounting holes 3 are bored at both ends of the lower part of the base plate.
is fixed to the rear end of the side of the seat cushion Sc.

A seat cushion side arm 4 as a first rotating arm is pivotally connected to the front outer surface of the base plate 2 by a shaft pin 5 so as to be rotatable up and down. A seat back side arm 6 serving as a second rotating arm to which the seat back Sb is attached is connected to the seat back 4 via a rotation adjustment mechanism 7 so as to be rotatable up and down.

That is, this rotation adjustment mechanism 7 has a gear portion 8 having internal teeth 8a cut on the inner periphery protruding from the outer surface of the free end of the seat cushion side arm 4 in an annular shape.
A gear 9 having external teeth 9a having one fewer tooth than the internal teeth 8a of the gear section 8 described above is fixed to the outer surface of one end of the seat back arm 6, and the gear 9 of the gear section 8 of the seat cushion side arm 4 is fixed. Operating shaft 10 in the center
An eccentric shaft body 11 is fixed to this operating shaft 10 inside the gear part 8, and this eccentric shaft body 11 is
A gear 9 is rotatably fitted to the seat back side arm 6 at its center, and a part of the external teeth 9a is connected to the internal teeth 8 of the gear portion 8 of the seat cushion side arm 4.
a, and is configured to mesh with the actuating shaft 1.
Retaining rings 12 and 13 are fitted to the seat cushion arm 4 and the seat back arm 6 from both sides, and an operating handle 14 is attached to the outer end of the operating shaft 10.

The rotation adjustment mechanism 7 configured in this way
The seat bag side arm 6, which is connected to the seat cushion side arm 4 via the seat cushion side arm 4, is configured such that the seat bag Sb is attached to it through a mounting hole 15 drilled at the other end. An engaging pin 16 is implanted toward the inside of the extension end 6a on the side, that is, the connecting portion side to the seat cushion side arm 4, and a long hole 17 is formed in the base plate 2 corresponding to the engaging pin 16. is drilled. This elongated hole 17 is formed with a required length facing the pivoting part of the seat cushion side arm 4, that is, the direction of the shaft pin 5.
6 is inserted and engaged.

Next, the operation of the reclining device of this example configured as above will be explained.

Now, the seat back Sb is fixed in the neutral position, and in this state, the seat cushion side arm 4 and the seat back side arm 6
The connecting portion or center portion of the hinge is set at the normal position (see solid lines in FIGS. 1 and 6).

From this state, when the operating handle 14 is rotated counterclockwise in the figure, the seat back arm 6 rotatably fitted to the eccentric shaft 11 is rotated.
The gear 9 is rolled along the inner teeth 8a of the gear portion 8 of the seat cushion side arm 4, and at this time, since the number of teeth on both sides is different, the seat back side arm 6 is rotated by the ratio of the number of teeth. is rotated rearward or in the direction of lodging relative to the seat cushion side arm 4.

When the seat back arm 6 is rotated with respect to the seat cushion arm 4 in this way,
Since the engagement pin 16 of the extension end 6a of the seat back arm 6 is engaged with the elongated hole 17 of the base plate 2, the seat cushion arm 4 is rotated, and the seat cushion arm 4 and the seat back arm are rotated. The connecting part 6 moves relatively downward (see the dashed line in Figure 6), and the connecting part between the seat cushion side arm 4 and the seat bag side arm 6, that is, the center of the hinge, is significantly lowered and the seat bag Sb is fully reclined. state (see Figure 2).

If the seat bag Sb is to be raised from this state, the operating handle 14 may be rotated in the opposite direction.

Furthermore, when the seat back Sb is in the neutral position, the operating handle 14 is rotated to rotate the seat back arm 6 forward relative to the seat cushion arm 4, and the seat back is moved forward.
Sb will be tilted forward (see the two-dot chain line in Figure 6).

In this drawing, only the reclining device 1 provided on one side of the seat is shown, but a reclining device with the same configuration is symmetrically provided on the other side. These reclining devices on both sides each have an operating shaft 1 of the rotation adjustment mechanism 7.
Therefore, the reclining device on the other side is operated in conjunction with the handle operation of the reclining device 1 on the one side without being provided with the operating handle 14.

As described above, in the reclining device 1 of this example, the center of the hinge is moved in conjunction with the reclining operation of the seat back Sb, so that the center of the hinge moves toward the back of the seated person during a small amount of recline, such as during normal driving. On the other hand, it does not move much, so the distance between the seat back Sb and the seated person's back does not change significantly.Also, when fully reclined, the center of the hinge is lowered significantly, so the distance between the seat cushion Sc and the seat back Sb This eliminates the level difference that occurs, ensuring a flat seating surface.
Therefore, the seated person can feel comfortable sitting.

In this example, a meshing mechanism of gears with different numbers of teeth is used as the rotation adjustment mechanism 7.
The rotation adjustment mechanism is not limited to this, and it is also possible to use, for example, a screw mechanism or a locking mechanism in which engaging teeth and a locking member engage with each other, as is normally used in reclining devices.

〔Effect of the invention〕

As described above, the reclining device of the present invention has
The center position of the hinge is changed in conjunction with the rotation of the second rotating arm relative to the first rotating arm, so that the center position of the hinge is aligned with the back of the seated person when reclining a small amount during normal driving. On the other hand, it does not move much, so the distance between the seat back and the seated person's back does not change significantly, and when fully reclined, the hinge center position is significantly lowered, eliminating the difference in level between the seat cushion and the seat back. This ensures that the seat surface is flat, thereby providing a comfortable sitting feeling to the seated person.

[Brief explanation of drawings]

Fig. 1 is a side view of the reclining device of the present invention, Fig. 2 is a side view showing its operating state, Fig. 3 is a perspective view of the reclining device of the present invention, and Fig. 4 is A-A' in Fig. 1. 5 is a partially cutaway side view of the rotation adjustment mechanism, FIG. 6 is a schematic diagram for explaining the operation of the reclining device of the present invention, and FIG. 7 is a reclining device equipped with a conventional reclining device. FIG. In the figure, Sc is the seat cushion, Sb is the seat back, 1 is the reclining device, 2 is the base plate, 4 is the seat cushion side arm as the first rotating arm, and 6 is the seat back side arm as the second rotating arm. , 7 is a rotation adjustment mechanism, 16 is an engagement pin, and 17 is a long hole.

Claims (1)

[Claims] 1 A first rotating arm is pivotally connected to a fixed member on the seat cushion side so as to be rotatable in the up-and-down direction, and the first
A second rotary arm to which the seat bag is connected
The rotary arms are connected to each other so as to be rotatably adjustable in the up-and-down direction via a rotary adjustment mechanism, and the extension end of the second rotary arm on the connecting portion side to the first rotary arm is connected to the The fixed member is engaged with the fixing member so as to be movable in the direction of the pivot portion of the first rotating arm, and as the second rotating arm rotates with respect to the first rotating arm. A reclining device characterized in that hinge center positions of the first rotating arm and the second rotating arm are changed.