JPS59168816A - Intermediate adjuster of seat back - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seat back intermediate adjuster that adjusts the bending angle by bending the intermediate portion of the seat 1 to the back of an automobile seat 1, etc. This invention relates to a seat back intermediate adjuster that can steplessly adjust the bending angle of the seat back.

If the shapes of the seats 1 to 1 can be changed to match the natural sitting posture when getting on the vehicle, the fatigue of the occupant will be further reduced. For this reason, seatback intermediate adjusters have traditionally been used, but since conventional seatback intermediate adjusters use a planetary gear mechanism, special molding processing is required to manufacture them, which increases manufacturing costs. There is a problem that the height increases, and there is a problem that so-called backlash occurs due to the presence of backlash.

The present invention has been made in view of these problems, and its purpose is to provide a seat back intermediate adjuster with a simple configuration that does not use a planetary gear mechanism, that is, an inexpensive seat back intermediate adjuster with less backlash. Our goal is to provide the following.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In Figures 1 to 4, 1 indicates upper seat back 2.
The upper arm 3 is fixed to the side, and the lower arm 3 is fixed to the side of the acid pack 4.

The lower seat back 4 can be tilted relative to the seat cushion 5 by operating a reclining device 6. An elongated hole 1a (longitudinal direction (vertical direction in FIG. 4)) is bored in the middle part of the upper arm 1, and a through hole 1b and an IC are formed above and below the elongated hole 1a. Mounting holes 1d and 1e are drilled respectively. On the other hand, a perfectly circular hole 3a is drilled in the middle part of the lower arm 3, and a through hole 3b and an arcuate elongated hole 3C are drilled above and below the hole 3a, respectively, and further below, a lower seat back 4 Mounting holes 3d and 3e are drilled. Here, the arc of the arc-shaped elongated hole 3C is the hole 3
It is centered around a.

Reference numeral 7 denotes a side play 1 in which an elongated hole 7a having the same shape as the elongated hole 1a of the upper arm 1 is bored, and through holes 7b and 7c are formed above and below the elongated hole 7a, respectively. Above upper arm 1. The lower arm 3 and the side plate 7 are stacked by a stepped pin 8.9 having a large diameter portion with an outer diameter smaller than the inner diameter of the through hole 3b and the width of the arcuate hole 3C. Thereby, the upper arm 1 and the side plate 7 can rotate around the stepped bin 8 within a range in which the stepped bin 9 can move within the arcuate hole 3C of the lower arm 3.

10 and 11 are disc-shaped cam plates having the same shape with eccentric positioning oval holes and having an outer diameter slightly smaller than the width of elongated holes 1a and 7a, and 12 is a disc with a concentric positioning oval hole. These cam plates 10
-12 are the elongated hole 1a, the elongated hole 7a, and the hole 3a, respectively.
It is rotatably fitted to the These three cam plays 1~
10 to 12 are fixed in a stacked manner by a handle shaft 15 to which a handle 13 is attached at one end with a retaining ring 14. That is, the distal end portion 15a of the handle tip 1-15 having an oval-shaped cross section is inserted into the oval hole of each cam plate 10-12, and the protruding portions are caulked to be fixed. In this fixed state, the cam plates 10 and 11 are
It projects eccentrically in the same direction with respect to the cam plate 12.

The operation of the embodiment configured as described above will be explained next. After the inclination angle of the entire seatback is adjusted by the reclining device 6, the bending angle of the upper seatback 2 is adjusted by the seatback intermediate adjuster.This adjustment can be done by rotating the handle 13. This is achieved by

That is, when the handle 13 is rotated, the eccentrically fixed cam plate 10.11 rotates around the cam plate 12 within the elongated holes 1a and 7a, and the elongated holes 1a and 7a cause
The displacement in the direction perpendicular to this is the upper arm 1. This will be communicated to side plays 1-7. Therefore, the upper arm 1 and the side plate 7 swing around the stepped bin 8, and the upper seat back 2 tilts. This bending angle adjustable range is a range in which the stepped bottle 9 can move through the arcuate hole 3C, as described above.

After this adjustment, even if a force is applied from the upper seatback 2 side, displacement in this direction is prevented by the frictional force received by the cam plates 10 to 12 fitted in the elongated holes 1a and 7g and the hole 3a, and the handlebar As long as 13 is not rotated, the adjustment position is secured.

In order to prevent the cam plates 10 to 12 from rotating due to the reduction of the frictional force due to vibrations of the automobile, etc., a bracket 20 is fixed to the tip of the handle shaft 15 as shown in FIG. It is preferable that the elastic body 21, such as urethane, is disposed in a compressed state.

In addition, in the above explanation, the side plate 7 and the cam play 1
-11 is shown, but this may be omitted. However, if this is omitted, it is necessary to provide a retaining means to prevent the cam plate 10.degree. 12 from coming off from the upper arm 1 and lower arm 3. Furthermore, cam play 1~
10 to 12 are shown in the fA layer to form a cam member, but there is a concentric part (which functions as the cam plate 12) and an eccentric part (which functions as the IJ plate 10).
If it is equipped with these, it is not necessary to configure it as in the above embodiment, and for example, these may be molded integrally with the handle shaft. Alternatively, the upper arm 1 and lower arm 3 of the above embodiment may be replaced, so that 1 is used as the lower arm and 3 is used as the upper arm. Furthermore, the lower arm 3 may be extended downward and also serve as the upper arm of the craning device 6.

This is convenient because the number of parts can be reduced (see FIG. 6).

As explained above, the seatback intermediate adjuster of the present invention includes a cam member having a concentric portion and an eccentric portion, and a hole into which the concentric portion and the eccentric portion are inserted, and a hole that allows relative rotational movement. The structure is extremely simple and inexpensive. Also, since it has a positive cam configuration, there is little backlash.

[Brief explanation of the drawing]

1 to 4 are explanatory diagrams showing one embodiment of the present invention,
Figure 1 is an external view showing the installed state, Figure 2 is a front view, Figure 3 is a front view, and Figure 3 is a front view.
The figure is a sectional view taken along the line AA in FIG. 2, and FIG. 4 is an exploded perspective view. Moreover, FIG. 5 is a sectional view showing the main part of another embodiment of the present invention,
FIG. 6 is a front view showing still another embodiment of the present invention in a mounted state. 1... Upper arm 2... Upper seat back 3... Lower arm 4... Lower seat back 5
...Seat cushion 6...Reclining device 7...Sight plate 8.9...Stepped bin 10.
12...Cam plate 13...Handle 14...Retaining ring 15...
Handle shaft 20...bracket 21...elastic bodies 1a, 7a
...Elongated holes 1b, 3a, 3b, 7b, 1c, 7cm...Hole 3C...
・Arc-shaped hole patent applicant Shiraki Metal Industry Co., Ltd. Representative Patent attorney Haruatsu Ijima Figure 1. ” Tail 3 Figure 14 ■ 1 ” ・■ Su 12 13 no q 0 Q d /--3

Claims (3)

[Claims] (1) A cam 014 having an eccentric part and a concentric part, and the cam J
A first arm having a perfectly circular hole in which the eccentric or concentric parts face each other, and a long hole extending in the longitudinal direction into which the concentric or eccentric part of the member is fitted. a second arm having a perforation therein, and a pivoting means for rotatably pivoting the first arm to the second arm;
One of the arms is fixed to the lower seat 1 to hatch side, and the other arm is fixed to the upper seat hack side, and the tilting of the upper seat 1 to back relative to the seat bank is controlled by the upper seat bank. Seat hack intermediate adjuster with 0 bias. (2) Of the first arm and the second arm, the lower seat l
- The seat 1 to back intermediate adjuster according to claim 1, wherein the arm fixed to the back side is shared with the upper arm of the reclining device. (3) The sea 1 to back intermediate adjuster according to claim 1 or 2, wherein a disc-shaped cam plate eccentrically fixed is used as the cam member.