JPH0119893B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a headrest device for a vehicle seat, etc., and in particular, the headrest main body can be directly rotated to easily adjust the rotation angle relative to the seatback, that is, the distance from the head of the seated person. It is something.

Conventionally, this type of headrest device has a gear mechanism that is always in mesh between the headrest main body and a rotation support part, and this gear mechanism is rotated by a knob attached to the headrest main body to rotate the headrest main body. There are known devices in which the angle can be adjusted, and devices in which a rotation mechanism having a frictional effect is arranged on the rotation support portion of the headrest body so that the headrest body can be directly rotated.

However, in the former type of headrest device, the rotating support part of the headrest body is in constant meshing of gears, so it can sufficiently withstand the load at the time of a collision, etc.
To adjust the rotation angle, the knob must be rotated in both the front and rear directions, which makes it difficult to perform quick adjustments.On the other hand, in the latter type of headrest device, the rotating support portion of the headrest body becomes locked due to friction. The rotation angle can be adjusted by directly pressing the headrest body, but if a large load is applied due to the impact of the head during a collision, etc., the headrest rotates unnecessarily, making it impossible to reliably support the head. However, if the frictional force of the rotation support part is increased to prevent this, there is a problem that the rotation angle cannot be adjusted smoothly.

The present invention provides a headrest device that eliminates the above-mentioned drawbacks.The purpose of the present invention is to allow the headrest body to smoothly adjust the forward rotation angle and remain immovable against the rearward force at the time of impact. It is held in this state, and when it is rotated forward by a predetermined angle, the rearward engagement is released.

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

FIG. 1 shows the entirety of a vehicle seat equipped with a head restraint device according to the present invention.A head restraint device 3 is provided on the upper surface of a seat back 2 of a seat 1 to restrict relative backward movement of the head of the seated person. This headrest device 3 surrounds a panel of a desired shape with a cushion material made of foam material or the like,
It further comprises a headrest main body 4 formed by covering with skin and a stay 5 which is attached to the upper surface of the seat back 2 so as to be adjustable in the height direction, and the headrest main body 4 is rotatably adjustable in the longitudinal direction with respect to the stay 5. ing.

FIG. 2 is a front view of the headrest device with the panel 11 of the headrest main body 4 cut out. A window hole 11a is formed in the bottom surface of the panel 11 of the headrest main body, and brackets 12 and 13 are erected facing each other on both sides of the window hole 11a. There is. On the other hand, a horizontal tubular shaft support 14 is fixed to the tip of the stay 5, and the end of the stay 5 is inserted into the panel 11 through the window hole 11a, and the tubular shaft support 14 is attached to the brackets 12 and 13.
It is pivotally connected by a shaft 15 via. This shaft attachment part is provided with an engagement mechanism 16 and an engagement release mechanism 17,
The panel 11 can be rotated in steps forward with respect to the stay 5, that is, toward the seated person.When the panel 11 is rotated by a predetermined angle, the engagement is released and the panel 11 can be rotated backward, so that the angle of rotation can be adjusted.

The pivoting portion of the panel 11 and the stay 5, the engagement mechanism 16, and the engagement release mechanism 17 will be described in detail with reference to an exploded perspective view in FIG. 3 and explanatory views of each part in FIGS. 4 to 6.

The brackets 12 and 13 are provided with shaft holes 12a and 13a that communicate with the shaft hole of the tubular shaft support 14 of the stay 5, and a nut 18 is welded to the outer surface of the shaft hole 12a of one bracket 12. , the other bracket 13 is higher than the one bracket 12, has a through hole 13b formed on the front edge side of its upper end, and has a nut 19 welded to its inner surface.
An arc-shaped elongated hole 13c centered on the shaft hole 13a is formed on the lower side of the shaft hole 3a.

The stay 5 is located below the tubular shaft support 14,
The screw hole 2 faces the long hole 13c of the bracket 13.
A bracket 20 with 0a is fixed.

The meshing mechanism 16 includes a fixed tooth plate 21 and a movable tooth plate 2.
2, the gear plate 21 has a sawtooth tooth profile 21a with a substantially vertical front part and an inclined rear part on the upper half circumference, a shaft hole 21b in the center, and a long bracket 13 in the lower part. Through hole 2 corresponding to hole 13c
1c are drilled in each case. This gear 21 is disposed on the outer surface side of the bracket 13, and is inserted into the shaft hole 21b through the shaft holes 12a, 13a of the brackets 12, 13 and the tubular shaft support 14 of the stay 5.
The shaft 15 screwed into the nut 18 on the outer surface of the bracket 13 is inserted through the shaft 15, and the step bolt 23 is inserted into the through hole 21c, and the stay 5 is inserted through the elongated hole 13c of the bracket 13.
It is fixed to the stay 5 by screwing into the screw hole 20a of the bracket 20.

On the other hand, the tooth plate 22 has a tooth profile 21a of the tooth plate 21 on the lower edge.
It has a saw-tooth shape 22a that is engaged with the rear part, that is, the front part is inclined and the rear part is substantially vertical, and a shaft hole 22b is bored in the front part. The bolt 24 is inserted through the bolt 24 and screwed into the nut 19 from the through hole 13b of the bracket 13 via the spring 25, so that it is rotatably supported, and is always rotationally biased downward so as to mesh with the gear plate 21.

A mesh release mechanism 17 is disposed between the tooth plate 21 and the tooth plate 22 configured in this manner. That is, gear plate 21
Pins 35a and 35b are protruded from the front and rear parts of the outer surface of the gear plate 21, and a first lever 41a and a second lever 41b are connected to a shaft pin 42 on the outer surface of the tooth plate 21.
A refraction lever 4 rotatably connected to the refraction lever 4 by
1 is disposed, the first lever 41a has a shaft hole 43 formed in its base end and is rotatably supported by a shaft 15, and the second lever 41b is connected to the first lever 41a.
A first lever 41a is installed on both side edges near the shaft attachment part.
Locking pieces 44 and 45 are provided protrudingly opposite to both side edges of the holder, and a U-shaped groove 4 that opens upward is provided at the tip.
6 is formed and is inserted into a pin 47 projecting from the rear end of the tooth plate 22 from below.

The locking pieces 44 and 45 of this bending lever 41 are
The distance from the shaft attachment part of the second levers 41a and 41b to the lower edge, that is, the distance L between the locking piece 44 on the front edge side and the distance L' between the locking piece 45 on the rear edge side is L<L. ', the bending angle between the levers 41a and 41b is set to be large on the front side and small on the rear side, and a protrusion 48 is provided on the outer surface of the second lever 41b. A spring 49 is stretched between the shaft 15 and the shaft 15 .

In this example configured in this way, when the headrest main body 4 is locked backward with respect to the stay 5, that is, when the tooth plate 22 is engaged with the tooth plate 21, the bending lever 41 is moved backward. After being bent, the U-shaped groove 46 at the tip of the second lever 41b is loosely inserted into the pin 47 of the tooth plate 22, and the bent state of the bending lever 41 is maintained by the biasing force of the spring 49 against the second lever 41b. (Figure 5A).

When the headrest main body 4 is pressed forward in this state, the panel 11 will show that the tooth profile 22a of the tooth plate 22 is aligned with the tooth plate 22.
It is rotated while sequentially passing over the tooth profile 21a of No. 1,
With this rotation, the U-shaped groove 46 of the refraction lever 41 is engaged with the pin 47 of the tooth plate 22, and the refraction lever 41 is rotated forward.

In this way, the panel 11 is rotated forward,
When the tooth plate 22 is rotated to the frontmost position with respect to the tooth plate 21, the front edge of the first lever 41a of the bending lever 41 comes into contact with a pin 35a protruding from the front part of the tooth plate 21 and is locked. However, in order to continue rotating further, the second lever 41b exceeds the dead center with respect to the first lever 41a, and is bent forward by being pulled by the action of the spring 49. This second lever 41b
The angle with the first lever 41a due to the bending of
The position of the groove 46 will move outward relative to the tooth plate 21, and the tooth plate 22 will be pushed outward via the pin 47 and rotated away from the tooth plate 21 ( Figure 5B).

That is, the relationship between the tooth plate 22 and the first and second levers 41a and 41b of the bending lever 41 is as shown in FIG. 6 when the first and second levers 41a and 41b are bent backward. In the case of bending forward, there is a difference H in the height of the U-shaped groove 46 at the tip, and the tooth plate 24 is rotated by this height H.
Therefore, the tooth plate 24 is disengaged from the tooth plate 21.

In this state, the panel 11 is rotated backwards with respect to the stay 5 by the biasing force of the spring 33, and the bending lever 41 is also rotated backwards with respect to the tooth plate 21 integrally with the tooth plate 22, and rotated by the required angle. The first lever 41a comes into contact with a pin 35b protruding from the rear of the gear plate 21 and is locked, so that the second lever 41b is bent backward beyond the dead center. By bending the second lever 41b backward, U
The position of the character-shaped groove 46 is lowered, so that the tooth plate 22 is rotated downward by the biasing force of the spring 25 and meshes with the tooth plate 21 again, and the panel 11 is locked rearward with respect to the stay 5. (Figure 5C).

In this way, the headrest main body 4 is attached to the stay 5.
The inclination angle is adjusted by pressing forward against.

In this embodiment, the stay 5 is shown as having a plate shape, but the stay 5 is not limited to this, and a rod shape can also be used.Moreover, if the engaging movement members are arranged on both sides of the shaft support of the panel 11, the stay 5 can be used as a head rest. 4 can be held and held in the rear more reliably.

As described above, according to the present invention, the headrest main body can be easily tilted forward by simply pressing it, the operability of adjusting the tilt is extremely good, it can be quickly set to a desired angle, and it can be locked rearward. The seat is held securely, and the head of the seated person can be almost completely prevented from moving backwards in the event of a vehicle collision, thereby improving safety. Moreover, there are no protruding parts such as knobs exposed on the outer periphery of the headrest body, so there is no risk of harm to other seated occupants, and the cushion and skin can be easily attached to the panel during manufacturing. The assembly process can be simplified, and its practical effects are great.

[Brief explanation of drawings]

FIG. 1 is a side view of a vehicle seat having a head restraint device according to the present invention, FIG. 2 is a partially cutaway front view of an example of the head restraint device according to the present invention, and FIG. 3 is an exploded perspective view of the main parts thereof. Figure 4 is a perspective view of the refraction lever, Figures 5A, B, and C are external views showing the operating states of the fixed tooth plate portion and movable tooth plate portion, and Figure 6 is an explanatory diagram of the operation of the refraction lever. It is. In the figure, 1 is the seat, 2 is the seat bag, 3 is the headrest device, 4 is the headrest body, 5 is the stay, 11 is the panel, 12 and 13 are the brackets, 1
5 is a shaft, 16 is an engagement mechanism, 17 is an engagement release mechanism,
21 is a fixed tooth plate, 22 is a movable tooth plate, 35a,
35b is a pin, and 41 is a refraction lever.

Claims (1)

[Scope of Claims] 1. A headrest device for a vehicle seat, etc., in which a headrest main body is rotated in the longitudinal direction relative to a stay supported by a seatback, and the rotation angle position relative to the seatback can be adjusted, comprising: the stay and the headrest; An interlocking mechanism is disposed between the headrest main body and the headrest main body to enable forward interlocking rotation and to lock backward rotation,
The meshing mechanism includes a meshing release mechanism that releases the meshing when the head rest main body is rotated forward by a predetermined angle, and the meshing mechanism includes a gear plate 21 fixed to the stay 5 side.
and the gear plate 2 provided on the head rest main body 11 side.
1, and a movable tooth plate 22 that is biased in the direction of a tooth profile 21a provided on the outer periphery of the tooth plate 21 and meshes with the tooth plate 21. and movable tooth plate 2
A pin 47 that is biased toward the side surface of the tooth plate 21 from 2
is rotatably disposed on the outer surface of the gear plate 21, and its tip is engaged with the pin 47, which separates the movable tooth plate 22 from the gear plate 21 when the movable tooth plate 22 moves forward. The bending lever 41 is formed by rotatably connecting a first lever 41a and a second lever 41b, and the second lever 41b has both side edges of the first lever 41a. Locking pieces 44 and 45 are provided protrudingly opposite to the first
A spring 49 is stretched between the shaft support of the lever 41a and the second lever 41b to maintain the bent state, and when the bending lever 41 rotates, the pin 35
a and 35b, the first lever
The bending directions of 41a and second lever 41b are reversed,
A headrest device for a vehicle seat, etc., in which a movable tooth plate 22 is brought into contact with and separated from a tooth plate 21.