JPH0330362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seat for a vehicle, etc., in which the upper part of the seat back can be bent and adjusted at any angle.

In recent years, so-called center-fold seats have been introduced in vehicle seats such as automobiles, in which the upper part of the seat back can be adjusted to tilt forward to form a suitable back surface that follows the back of the seated person during reclining operations. has been proposed and is being implemented.

However, most of the known seats of this type adjust the tilt of the upper part of the seat back in stages, making it difficult to match the position desired by the seated person. A step-lock type adjustment mechanism has been proposed and implemented, but since this step-lock type adjustment mechanism uses a gear mechanism, it is difficult to operate, is heavy, and the mechanism itself is complicated. It had drawbacks such as a large number of parts and high manufacturing costs.

The present invention has been made in view of these points, and allows the upper part of the seat back to be tilted in a stepless manner.
The present invention also provides a seat for a vehicle, etc., which has a simplified configuration and reduced costs.

That is, the present invention divides the seatback frame into two parts, and connects the upper frame to the lower frame so as to be rotatable in the front and back direction.The upper frame has an arm protruding forward or backward at a required angle, and the lower frame The frame includes a shaft, a rotating member that is rotatably fitted to the shaft, and a rotating member that is located on both sides of the rotating member and is fitted to the shaft, and the inner end of the shaft is fitted to the rotating member. Two coil springs that are engaged and have an inner diameter smaller than the diameter of the shaft and are wound in the same direction, a bracket that presses the outer end of each of the coil springs in a direction that increases the diameter, and a bracket that is connected to the bracket. A locking device consisting of an operating member is provided corresponding to the arm, and the arm and the rotating member are linked by a connecting rod, so that the upper frame can be tilted steplessly with respect to the lower frame. This is what was done.

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, 1 indicates the entire seat of a vehicle, etc., and this seat 1 is made up of a seat cushion 2 and a seat back 3 connected through a reclining device, and the upper part 3a of the seat back 3 can be tilted and adjusted in the front-rear direction. There is.

Reference numeral 4 designates a back frame arranged inside the seat bag 3, and this back frame 4 is divided into an upper frame 5 and a lower frame 6. An inverted dog-shaped arm 7 is fixed to the lower part of one side 5a of the upper frame 5 at one side 7a, and the other side 7b protrudes forward. A bracket 7' is fixed to the bracket 7'. On the other hand, brackets 8a and 8b are fixed to the upper portions of both sides 6a and 6b of the lower frame 6, respectively.
The upper frame 5 is attached to these brackets 8a and 8b.
The center part of the arm 7 and the lower part of the bracket 7' are rotatably connected to each other by connecting pins 9a and 9b, so that the upper frame 5 can be rotated in the front-back direction with respect to the lower frame 6. connected.

A locking device 10 is provided at the lower part of one side 6a of the lower frame 6 in correspondence with the other side 7b of the arm 7 of the upper frame 5.

This lock device 10 will be described in detail below.

A bracket 11 fixed to a predetermined lower part of one side 6a of the lower frame 6 is made up of two L-shaped pieces 1.
1a and 11b are fixed together with bolts and nuts 12 to form a cross-sectional shape as a whole, and one L
A shaft 14 is fixed to the upright surface portion 11a' of the L-shaped piece 11a so that the tip thereof passes through a shaft hole 13 formed in the upright surface portion 11b' of the other L-shaped piece 11b. A short tube 22 as a boss portion is fitted and fixed in the shaft hole 13 of the shaped piece 11b. A rotary member 15 is fitted into the shaft 14 so as to be rotatable in the circumferential direction through a shaft hole 15' bored at one end thereof, and coil springs 16 are positioned on both sides of the rotary member 15. and 17 is shaft 1
4 is fitted. These coil springs 1
6 and 17 are wound in the same direction and have an inner diameter smaller than the diameter of the shaft 14. During the assembly process, they are fitted onto the shaft 14 with their diameters expanded, and after assembly, That is, in the state shown in FIG. 4, it is in close contact with the outer circumferential surface of the shaft 14 due to elastic force. Note that it is desirable that the outer circumferential surface of the shaft 14 be formed into a slightly rough surface so as to increase the frictional force with the coil springs 16 and 17. The inner ends 16a and 17a of these coil springs 16 and 17 are connected to engagement holes 15a and 15 that are symmetrically formed in the rotating member 15 with the shaft hole 15' in between.
b, respectively.

Further, a bracket 18 having a shape so as to sandwich the coil springs 16 and 17 from the outside has a shaft hole 18 bored in both side surfaces 18a and 18b.
It is rotatably fitted to the shaft 14 by a' and 18b' in the circumferential direction. An engaging portion 19 is formed at the upper portion of one side edge of the one side surface portion 18a of the bracket 18, and an engaging portion 20 is formed at the lower portion of the one side edge portion of the other side portion 18b. Coil springs 16 and 1 to 19 and 20
The outer ends 16b and 17b of 7 are respectively locked in the twisting direction. Further, a cylindrical shaft 21 is fixed to the outer side surface of the other side surface 18b of the bracket 18 so as to be continuous with the shaft hole 18b'. An operation dial 23 is attached to the outer end of the support.

The lock device 1 configured as described above is
The other end of the rotating member 15 of 0 and the arm 7 of the upper frame 5 are connected by a connecting rod 24. That is, the upper end of the connecting rod 24 is connected to the tip of the other side 7b of the arm 7, and the lower end is connected to the other end of the rotating member 15 by connecting pins 25a and 25b, respectively. The upper frame 5, the other side 7b of the integral arm 7, the connecting rod 24, the rotating member 15, and the one side 6a of the lower frame 6 including the bracket 11 constitute a four-bar link mechanism L.

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

Now, in the state shown in FIG. 4, the rotating member 15 of the locking device 10 is locked so that it cannot rotate.
Therefore, the upper frame 5 connected to the rotating member 15 via the connecting rod 24 also has a lower frame 6.
It is locked in such a way that it cannot be tilted. Note that when the rotating member 15 is in the rotating position substantially perpendicular to the lower frame 6 as shown in FIGS.
It is set to be in a substantially upright state, that is, in a neutral state.

From this state, the operation dial 2 of the locking device 10
3 is rotated in the direction of arrow a, the bracket 18 is also rotated together with the rotation, and the engaging portion 19 is rotated.
presses the outer end 16b of the coil spring 16 in a direction opposite to the twisting direction of the coil spring 16,
Therefore, the coil spring 16 is twisted in a direction in which its diameter increases. As a result, the coil spring 16, which was in close contact with the shaft 14, is separated from the outer peripheral surface of the shaft 14, and the rotational force is transferred from the coil spring 16 to the rotating member 1.
5, so that the rotating member 15 is rotated in the same direction as the bracket 18, that is, in the direction of arrow a'.
At this time, the coil spring 17 facing the coil spring 16 has its outer end 17b engaged with the engaging portion 20 of the bracket 18, which is engaged with the outer end 17b.
By being rotated in a direction away from 7b, it is possible to rotate in the same direction as the rotation of the rotation member 15, and therefore the rotation of the rotation member 15 is not hindered. And the arrow of this rotating member 15
Arm 7 faces this as it rotates in the a′ direction.
The other side portion 7b is rotated in the same direction by the four-bar link mechanism L, so that the upper frame 5 is rotated forward with respect to the lower frame 6, and the upper portion 3a of the seat back 3 is tilted forward. Become.

Furthermore, when the operation dial 23 is rotated in the opposite direction, that is, in the direction of arrow b, the bracket 18 is rotated together with the rotation, and the engaging portion 20 engages the outer end 17b of the coil spring 17. The coil spring 17 is twisted in the direction in which its diameter increases. As a result, the coil spring 17 that was in close contact with the shaft 14 is separated from the outer peripheral surface of the shaft 14, and the rotational force is transmitted from the coil spring 17 to the rotating member 15.
Therefore, the rotating member 15 is rotated in the same direction as the bracket 18, that is, in the direction of arrow b'. At this time, the coil spring 1 facing the coil spring 17
6, the engagement edge 19 of the bracket 18, to which the outer end 16b is engaged, is rotated in a direction away from the outer end 16b. Therefore, rotation of the rotating member 15 is not hindered. As the rotating member 15 rotates in the direction of arrow b', the other side 7b of the arm 7 faces the rotating member 15.
are rotated in the same direction by the four-bar link mechanism L,
Therefore, the upper frame 5 is rotated rearward with respect to the lower frame 6, and the upper part 3a of the seat bag 3 is tilted rearward.

In this way, by rotating the operation dial 23, the upper frame 5, that is, the upper part 3a of the seat back 3
After setting the desired angle of inclination, turn the operation dial 2.
3 stops rotating and releases the operation dial 23, the coil spring 16 or 17 is no longer pressed by the engagement edge 19 or 20 of the bracket 18, and the coil spring 16 or 17 returns to the shaft 14 by its own return elastic force. The rotating member 15 is in close pressure contact with the outer circumferential surface, and the rotating member 15 is locked so that it cannot rotate.
is locked, and the upper frame 5, ie, the upper part 3a of the seat bag 3, is fixed in that position. For example, in this state, if a rearward load is applied to the upper frame 5 due to seating, etc., and a rotational force in the direction of arrow b' is applied to the rotating member 15 via the connecting rod 24, the coil spring 17 will have its inner diameter It is twisted in the direction of contraction and tightens the shaft 14, thereby preventing the rotating member 15 from rotating, and therefore also preventing the upper frame 5 from rotating. Further, a load is applied to the upper frame 5 in the forward direction and is applied to the rotating member 15 via the connecting rod 24.
When a rotational force in the a' direction is applied, the coil spring 16 is twisted in the direction in which its inner diameter contracts, tightening the shaft 14, and the rotation of the rotation member 15 is thus prevented. Therefore, rotation of the upper frame 5 is also prevented.

In this way, the load in both directions applied from the upper frame 5 to the rotating member 15 via the connecting rod 24 is supported by the frictional force of the two coil springs 16 and 17 arranged on both sides of the rotating member 15, respectively. Therefore, the rotating member 15 is reliably locked and the upper frame 5 does not play.

In addition, in the seat of this example, the upper frame 5
The rotation in the front-back direction is operated by a four-bar linkage mechanism L consisting of the other side 7b of the arm 7, the connecting rod 24, the rotating member 15, and one side 6a of the lower frame 6 including the bracket 11. This allows smooth operation and greatly improves the strength against loads.

As described above, according to the present invention, the upper part of the seat back can be quickly adjusted to a desired bending angle by simply rotating the operation dial, and can be adjusted steplessly, so that the seatback The angle can be set accurately to suit your preference, ensuring a comfortable seating position at all times.Furthermore, the configuration is simple without the need for a complicated locking device like in the past, and the number of parts is kept to a minimum, reducing weight and cost. It has the following effects.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a seat of a vehicle etc. of the present invention;
Figure 2 is the front view of the back frame structure, Figure 3 is the same.
The figures are a side view, FIG. 4 is a partially cutaway bottom view of an example of a locking device applied to the present invention, FIG. 5 is an exploded perspective view of the same, and FIG. 6 is a side view with some important parts omitted. It is. In the figure, 4 is a back frame, 5 is an upper frame, 6 is a lower frame, 7 is an arm, 10 is a locking device, 14 is a shaft, 15 is a rotating member, 16
17 is a coil spring, 18 is a bracket, and 23 is an operation dial as an operation member.

Claims (1)

[Claims] 1. The seatback frame is divided into two parts vertically, and the upper frame is connected to the lower frame so as to be rotatable in the front and back direction, and the upper frame is provided with an arm protruding forward or backward, and the lower frame has:
a shaft, a rotating member rotatably fitted to the shaft; and a rotating member located on both sides of the rotating member and fitted to the shaft, each having an inner end engaged with the rotating member. two coil springs having an inner diameter smaller than the diameter of the shaft and wound in the same direction; a bracket that presses the outer end of each of the coil springs in a direction in which the diameter increases; and a bracket connected to the bracket. A seat for a vehicle, etc., wherein a locking device comprising an operating member is provided corresponding to the arm, and the arm and the rotating member are linked by a connecting rod.