JPH0368684B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a headrest angle adjustment device for an automobile seat.

(Prior Art) Generally, a headrest is attached to the upper end of the seat back of an automobile seat.

In the above configuration, when the seat back is rotated vertically so as to have a desired inclination angle, the headrest rotates the seat back via the parallel link so that the seated person's face faces forward regardless of the inclination angle. (For example, Japanese Utility Model Application Publication No. 55-100558).

(Problem to be Solved by the Invention) By the way, when taking a nap in a car, for example, it is normal to rotate the seat back rearward until it is almost horizontal, so that the upper surface of the seat is completely flat. desired. However, with the seat configured as described above, when the seat back is placed in a substantially horizontal position, the headrest protrudes above the seat back. Therefore, this headrest prevents the entire sheet surface from being flat.

(Object of the Invention) This invention was made in view of the above-mentioned circumstances, and even when the seat back is set at a desired angle of inclination, the headrest makes the seated person always face forward. In addition, when trying to take a nap,
To obtain a generally horizontal flat surface on a sheet, and to obtain such a flat surface by a simple operation.

(Structure of the Invention) A feature of the present invention for achieving the above object is that when the seat back is set at a desired angle of inclination, the headrest automatically assumes a predetermined standing posture regardless of the angle of inclination. In addition, when the seat bag is rotated downward and rearward beyond a predetermined value, the headrest is automatically permitted to rotate downward and rearward.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes an automobile seat, and the seat 1 includes a seat cushion 2 supported on the floor of the vehicle body, a seat back 3 provided at the rear end of the seat cushion 2, and a headrest 4 attached to the upper end of the seat back 3. It consists of

The seat cushion 2 is a seat cushion frame 6 formed by bending a pipe with a circular cross section.
The seat cushion frame 6 is covered with a seat cushion pad 7.

Further, the seat bag 3 has a seat bag frame 8 formed by framing a pipe with a circular cross section.
The seat back frame 8 is composed of a pair of left and right vertical pipes 8a, 8a, and a pair of upper and lower horizontal pipes 8b, 8b installed over the vertical pipes 8a, 8a. Further, this seat back frame 8 is covered with a seat back pad 9. The lower end of each vertically oriented pipe 8a is pivotally supported to the rear end of the seat cushion frame 6 via a first pivot shaft 11 whose axis is horizontally oriented.
The seat bag 3 is vertically movable about a pivot shaft 11. A reclining adjuster 10 holds the seat back 3 at a desired inclination angle.

A head rest 4 is connected to the rotating end of the seat back frame 8 via a second pivot shaft 12 that is oriented laterally.
A bracket 13 supporting the is rotatably supported.

That is, the bracket 13 is connected to the vertical pipe 8.
Support pipe 14 installed between the rotating ends of a and 8a
and a support rod 15 for supporting the headrest 4 in the middle of this support pipe 14, and both ends of this support pipe 14 are connected via the second pivot shaft 12 provided coaxially with this support pipe 14. It is pivotally supported by a seat back frame 8.

When the seat back 3 is rotated rearward and downward to obtain a desired inclination angle, the parallel link automatically adjusts the standing posture of the headrest 4 so that the seated person's face faces forward regardless of the inclination angle. A mechanism 16 is provided.

The parallel link mechanism 16 will be explained next.

A link 17 substantially parallel to a line connecting the first pivot shaft 11 and the second pivot shaft 12 is provided in front of one vertical pipe 8a. The link 17 has a U-shaped cross section, and the lower end of the link 17 is pivotally supported on the side of the seat cushion frame 6 via a third pivot shaft 18 extending laterally.

On the other hand, the bracket 13 has an engagement plate 19 projecting forward from the support pipe 14, and the engagement plate 19 has an arcuate portion 20 formed around the axis of the support pipe 14. There is. This arcuate portion 20 and the upper end of the link 17 fit together. Further, in this case, the rotating end of the link 17 and the outer circumferential surface of the arcuate portion 20 are slidable in the circumferential direction of the arcuate portion 20 .

An engagement shaft 22 is attached to the upper end of the link 17. On the other hand, when the seat back 3 is in the upward rotational position (shown by the solid line in the figure), the engagement shaft 22
An engagement recess 23 is formed at the upper end of the arcuate portion 20. A spring 24 that elastically engages the engagement shaft 22 with the engagement recess 23 is stretched between the engagement shaft 22 and the support pipe 14.

The parallel link mechanism 16 is connected to the vertical pipe 8.
a and the link 17, and when rotating the seat back 3 rearward and downward (arrow A in FIG. 1),
This parallel link mechanism 16 allows the headrest 4 to
is maintained in a nearly constant upright position.

Further, when the seat bag 3 is rotated backward and downward by a predetermined amount or more (as shown by the dashed line in FIG. 1), the engagement shaft 2
2 is disengaged from the engagement recess 23 against the elastic force of the spring 24, and the headrest 4 is allowed to rotate rearward and downward.

That is, in the illustrated example, a guide surface 26 that is inclined outward in the radial direction of the arcuate portion 20 is formed continuously from the upper edge of the engagement recess 23 . When the seat back 3 rotates rearward and downward as described above, the engagement shaft 2
2 slides in the engagement recess 23, and the link 1
7 is guided radially outward of the arcuate portion 20 while sliding on the guide surface 26, whereby the engagement shaft 22 is disengaged from the engagement recess 23 as described above. .

On the other hand, a stopper 27 is provided protruding from the lower end of the arcuate portion 20. This stopper 27 prevents the head rest 4 from rotating rearward and downward beyond a predetermined amount. That is, when the seat bag 3 is held almost horizontally and the head rest 4 is rotated rearward and downward, the upper surface of the head rest 4 is aligned with the seat bag 3.
When the stopper 27 is almost flush with the top surface of the
prevents further rotation of the headrest 4 (as shown by the two-dot chain line in FIG. 1).

(Effects of the Invention) According to the present invention, when the seat back is set at a desired inclination angle, the headrest can automatically assume a predetermined upright posture regardless of the inclination angle, so that the seat back can be adjusted according to the preference of the seated person. Even when the seat is tilted, the seated person's face can always be directed forward. Therefore, a favorable seating posture can be maintained during driving and the like.

In addition, since the headrest is automatically allowed to rotate rearward and downward when the seat back is rotated backwards and downwards by more than a predetermined amount, it is possible to automatically allow the headrest to rotate backwards and downwards by more than a predetermined amount. The automatic rotation of the headrest makes it possible to obtain a completely flat surface on the seat. Therefore, for example,
It is useful to have a wide flat surface when you are trying to take a nap. Moreover, such a flat surface can be obtained simply by rotating the seat back without rotating the headrest. is easy.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view showing the posture of the seat back and headrest at each rotating position, Fig. 2 is an overall perspective view of the seat, and Fig. 3 is a partially enlarged side view of the seat. . DESCRIPTION OF SYMBOLS 1... Seat, 2... Seat cushion, 3... Seat back, 4... Head rest, 11... First pivot shaft, 12... Second pivot shaft, 13... Bracket, 16
...Parallel link mechanism, 17...Link, 22...Engagement shaft (engagement part), 23...Engagement recess.

Claims (1)

[Claims] 1. A seat bag was pivoted to the rear end of the seat cushion via a first pivot shaft so as to be movable up and down, and a bracket supporting the headrest was pivoted to the rotating end of the seat bag via a second pivot shaft. In the automobile seat, a link is provided which is substantially parallel to a line connecting the first pivot shaft and the second pivot shaft and whose one end is pivotally supported by the seat cushion, and an engaging portion is provided at a rotating end of the link. and, on the other hand, an engaging recess is formed in the bracket to engage with the engaging part when the seat bag is in an upwardly rotating position, and the engaging part is elastically engaged with the engaging recess, so that the seat bag The bracket and the link constitute a parallel link mechanism, and when the seat bag rotates backwards and downwards by a predetermined amount or more, the engaging portion resists the elastic force and separates from the engaging recess, causing the headrest to rotate backwards and downwards. 1. A headrest angle adjustment device for an automobile seat, characterized in that the headrest angle adjustment device is configured to allow the following.