JPS6057328B2 - seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seat for a vehicle, etc., and in particular to a seat that reclines, the shape of the back surface at that time is changed by changing the inclination angle of the upper part of the seat back in conjunction with the reclining motion. The seat back is deformed to a state suitable for the reclining angle, and the seat back can be held at a substantially constant gap from the back surface of the seated person over its entire surface.

In a conventional seat, as shown in FIG. 1, a seat back 1 is integrally formed with a back frame 11, and the reclining angle of the seat cushion 2 is simply adjusted by a reclining device 3. Therefore, when the seat back 1 is in the normal position, the gap between the back surface of the seated person H and the back surface is maintained almost constant (Fig. 1A), but when the seat back 1 is tilted backwards, If the seated person H continues to write, his/her line of sight will be directed upwards, and the seated person (H), especially the driver, must keep his or her eyes forward at all times, so he or she must raise his or her upper back. The upper back of the seated person H and the upper back surface of the seat back 1 are separated, and a large gap S is created between them (see Fig. 1B).
), it was uncomfortable to sit, and it was difficult to maintain a stable sitting posture, resulting in easy fatigue.

Therefore, the present invention has been made in view of this point, and is capable of bending the upper part of the seat back forward in a seat where a reclining action is performed, and this forward bending action is linked to the rearward reclining action of the seat back. It is configured so that it is carried out as follows.

That is, as shown in FIG. 2, the present invention is a seat in which the seat back 1 can be tilted and tilted with respect to the seat cushion 2 by a reclining device 3, and the back frame 11 of the seat back 1 is divided into upper and lower frames 11a and 11b. At the same time, the upper frame 11a is pivotally attached to the lower frame 11b so as to be rotatable forward, and is rotated forward via the interlocking means 13 as the lower frame 11b tilts rearward, so that the seat back 1 is rotated forward. The shape of the back surface can be changed to suit the reclining angle.

An embodiment of the present invention will be described below with reference to FIG. 3 and subsequent figures.

The upper frame 11a of the back frame 11, which is divided into upper and lower parts, has a dogleg-shaped arm 14 fixed to one end, and a shaft 15 connects the center of the arm 14 and the other end of the frame. Attach both ends of the lower frame 1
The lower frame 1 is attached by pivoting 12 to the upper end of 1b.
The upper frame 11a is rotatably connected to the upper frame 1b, and rearward rotation of the upper frame 11a is prevented by abutting and engaging with the rear part of the upper edge of the lower frame 11b. On the other hand, a side bracket 16 is fixed to one lower end of the lower frame 11b, and a hinge bracket 22 fixed to the rear part of one side of the cushion frame 21 of the seat cushion 2 is connected to the shaft hole 17 bored in the side bracket 16. The other lower end portion of the lower frame 11b is supported by overlapping the drilled shaft hole 23 and inserting the shaft pin 24 therethrough. A reclining device 3 is installed between the rear part of the cushion frame 21 on the other side, and by operating this reclining device 3, the back frame 11 is moved to the lower frame 11b.
It is tilted around the shaft support as the center of rotation.

In this configuration, there is an inverted L at the tip of the side bracket 16.
A shaped lever 18 is rotatably supported by a shaft pin 19 at the center thereof, and a pin 20 is protruded from the lower end of the vertical piece 18a to form a deformed arc-shaped guide formed on the hinge bracket 22. While engaging with the elongated hole 1 25, the horizontal piece 1
The lower end of an interlocking rod 26, which is pivotally connected to the tip of the dogleg-shaped arm 14 whose upper end is fixed to the frame 11a, is pivotally connected to the end of 8b.

Further, the guide elongated hole 25 of the hinge bracket 22 is located at the upper and lower parts 25.
a, 25b are formed in an arc shape that swells forward with the pivot portion of the side bracket 16 as the center, and the middle portion 25c is swelled forward with a smaller diameter than the upper and lower portions 25a, 25b, that is, the intermediate portion 25c is formed from the pivot portion of the side bracket 16 to the middle portion. It is formed into a deformed arc shape in which the distance to the portion 25c is larger than that of the upper and lower portions 25a and 25b. Next, the operation of this example configured as above will be explained.

Seat back 1 is aligned with seat cushion 2 in Fig. 2A.
When the back frame 11 is in the normal standing state shown in FIG. The lower part 24b of 25 is engaged with the lower part 24b.

Then, operate the reclining device 3 and seat back 1.
That is, when the back frame 11 is tilted backward, the lever 1
8 is a pin 20 that moves upward by rotation of the side bracket 16.
is moved along the lower part 25b of the guide elongated hole 25, and since the lower part 25b is provided around the rotation center of the side bracket 16, the lever 18 is in a stationary state and the movement along the lower part 25b is caused by the rotation of the side bracket 16. It is moved along with the movement. When the back frame 11 is further tilted backward from this state, the lever 18 is moved upward and the pin 20 moves from the lower part 25b of the guide slot 25 to the intermediate part 25c, but this intermediate part 25c has a smaller diameter than the lower part 25b. Therefore, the lever 18 is moved in a direction away from the rotation center of the side bracket 16, and the lever 18 is rotated clockwise in FIG. be done.

This rotation of the lever 18 moves the interlocking rod 26 downward, and the downward movement of the interlocking rod 26 causes the back frame 11 to move downward.
The doglegged arm 14 of the upper frame 11a is pulled down, so that the upper frame 11a is lower than the lower frame 11b.
It is rotated forward about the shaft support 12 as the center of rotation. That is, the upper frame 11a is tilted in a state where it is raised higher than the lower frame 11b (as shown by the two-dot chain line a in FIG. 4). In this way, the back frame 11 is tilted further rearward,
When the pin 20 of the lever 18 is moved to the center of the intermediate portion 25c of the guide elongated hole 25, that is, to the position farthest from the rotation center of the side bracket 16, the lever 18 is rotated to the maximum with respect to the side bracket 16, and the upper frame 11a is largely rotated forward via the interlocking rod 26 (double-dashed line b in the figure).

As this back frame 11 further tilts and becomes a reclined state, the pin 20 of the lever 18 is moved from the middle part 25c of the guide slot 25 toward the upper part 25a, and along with this shift, the rotation of the lever 18 becomes smaller and smaller. Therefore, when the pin 20 is moved to the upper part 25a, the pin 20 is moved at the same rotation center as the side bracket 16 in the same way as when it is moved along the lower part 25b as described above, so that the lever 18 is not rotated. The upper frame 11a is positioned on the same plane as the lower frame 11b and is inverted integrally to a substantially horizontal position (double-dashed line c in the figure).

In this way, while the back frame 11 is tilted, the upper frame 11a is sequentially tilted in the upright direction with respect to the lower frame 11b until the required tilt position is reached, and when the required tilt angle is exceeded, the upper frame 11a The inclination angle of the lower frame 11a gradually approaches the inclination angle of the lower frame 11b, and when the upper and lower frames 11a, 1
1b becomes the integral tilt angle.

In this example, the shape of the guide hole 25 with which the pin 20 of the lever 18 is engaged, particularly the bulging shape of the intermediate portion 25c, determines the rotation range of the lever 18 as the back frame 11 tilts, and therefore the back The start and end of the tilting of the upper frame 11a accompanying the tilting of the frame 11 and the maximum inclination angle of the upper frame 11a with respect to the lower frame 11b are determined.

For example, the reclining movement of the seat back 1 and the upper part 1a
In the first reclining stage, the upper part 1a tilts forward by 24 degrees, in the fifth reclining stage it tilts forward by 17 (maximum tilting), gradually returns from the seventh reclining stage, and in the 11th reclining stage. In other words, the back frame 11 can be operated so that the back surface of the seat back 1 becomes flat. As described above, the inclination angle of the upper part 1a of the seat back 1 is changed during the reclining operation by the operation of the back frame 11,
When the seat back 1 is tilted within the required range of inclination, that is, within the range of inclination that allows the driver to maintain a seated posture, the upper part 1a of the seat back 1 rotates forward and its inclination angle changes, causing the back of the seated person to be tilted. the upper part of the seat back 1 and the upper part 1a of the seat back 1
The gap between the two is kept to a minimum, that is, they are maintained in a substantially abutting state. Further, when the seat back 1 is tilted to a degree greater than that required to maintain a driving posture, the upper portion 1a of the seat back 1 comes to be located on the same plane as other parts, and the entire seat becomes flat.
As described above, in the seat according to the present invention, when the seat back is adjusted by the reclining device, as the seat back tilts backward, the upper frame tilts forward with respect to the lower frame using its pivot as a fulcrum, and the upper frame tilts forward at the intermediate stage of reclining. When the seat is crossed, it tilts backward, and in the final stage, the upper frame is in a straight position with respect to the lower frame, so the seatback is reclined within the range that the driver can drive, such as in the driver's seat of a car. The upper part of the seatback is tilted forward, allowing a stable driving position without creating a large gap between the driver's upper back and the seatback, and when the seatback is fully reclined. The seat back becomes a horizontal plane over the entire surface, allowing it to be used as a pet and as a table for placing items.In addition, a pin protruding from a lever connected to the upper frame via an interlocking rod extends the guide length. The inclination angle of the upper part of the seat back is changed by sliding in contact with both edges of the hole, so the upper part of the seat back remains immovable under loads from either the front or back direction, ensuring reliable support for the seated person. It has the following effects.

It should be noted that the present invention can be practiced not only in the embodiments described above, but also in various modifications without changing the gist thereof.

[Brief explanation of the drawing]

FIG. 1 is a side view of the operation mode of a conventional vehicle seat, FIG. 2 is a side view of the operation mode of the vehicle seat according to the present invention, and FIG. 3 is a perspective view of an example of the frame portion of the seat according to the present invention. Fourth
The figure is an enlarged sectional view of the main part of FIG. 3, and FIG. 5 is an exploded perspective view of the main part.

Claims (1)

[Claims] 1. A seat frame in which the seat back reclines, the back frame is divided into an upper frame and a lower frame, the upper frame is rotatably supported on the lower frame, and the lower frame is supported on the lower frame. A deformed arc-shaped guide hole is formed on the side near the shaft support of the lower frame so that the distance from the center of rotation of the lower frame is large in the middle part and small in both sides, and A lever having a pin protruding from one end is pivotally attached to the frame at a portion extending from the shaft support, and the pin of the lever is engaged with the guide elongated hole, and the other end of the lever is connected to the upper frame. The lever is connected by an interlocking rod, and the lever is moved along the guide elongated hole as the lower frame is tilted backward, and the angle of the lower frame is changed by movement along the intermediate arcuate portion of the guide elongated hole. As a result, while the lever is moved from the lower end of the intermediate arc-shaped part of the guide elongated hole to the highest apex, the lower frame is tilted forward with respect to the lower frame via the interlocking rod. A seat characterized in that, while being moved from the apex to the upper end, the seat is tilted backward so as to be positioned on the same plane as the lower frame.