JPS6339453B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a headrest device for a vehicle seat, etc., and in particular to a headrest device in which the rotational angle relative to the seatback, that is, the distance from the head of the seated person, can be easily adjusted by directly rotating the headrest body. 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 on the head in the event of a collision. However, in the latter type of headrest device, the rotating support part of the headrest body becomes locked due to friction, and the rotation angle can be adjusted by directly pressing the headrest body. However, if a large load is applied due to the impact of the head during a collision, etc., it will rotate unnecessarily and the head cannot be supported reliably.
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 away, and FIG.
A window hole 11a is formed in the bottom surface of the window hole 11a, and brackets 12 and 13 are erected facing each other on both sides of the window hole 11a.
On the other hand, a horizontal tubular shaft support 1 is attached to the tip of the stay 5.
4 is fixed, and the tip of this stay 5 is inserted into the panel 11 through the window hole 11a and is pivotally attached to the brackets 12 and 13 via a tubular shaft support 14 by a shaft 15. This shaft attachment part is equipped with an engagement mechanism 16 and an engagement release mechanism 17, and the panel 11 can be rotated stepwise relative to the stay 5 forward, that is, toward the seated person.When the panel 11 is rotated by a predetermined angle, the engagement is released and the panel 11 is rotated backward. It is rotatable and the rotation angle 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. 4 and explanatory views of each part in FIGS. 5 to 9.

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,
A through hole 13b is bored at the rear edge of the upper end, and a nut 19 is welded to the inner surface of the hole 13b.
There is an arc-shaped long hole 1 centered on the shaft hole 13a on the lower side.
3c is formed.

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 rear part. The bolt 24 is inserted and screwed into the nut 19 from the through hole 13b of the bracket 13 via the spring 25, so that the bolt 24 is rotatably supported, and is always rotationally biased downward so as to mesh with the tooth disc 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
On the inner side along the tooth profile 21a, there is a raised edge 26b at the front part continuous with the peripheral edge 26a centered on the shaft hole 21b.
An inner guide plate 26 is fixed to the inner guide plate 26, and has a protrusion 27b at the front end continuous with a peripheral edge 27a that protrudes to a height more than twice the height of the tooth profile 21a on the outer surface side along the tooth profile 21a, and has a protrusion 27b at the front end. The outer guide plate 27 is bent in a direction to form a guide portion 27c.
is fixed.

In addition, the tooth plate 22 has a through hole 22b at its tip,
A bracket 28 having a through hole 28a communicating with the through hole 22b is fixed to the inner surface of the tip end, and the through hole 22b is fixed to the inner surface of the tip.
A pin 29 is slidably passed through between b and 28a and is always biased by a coil spring 30 so as to protrude outward.
1 is fixed with its lower edge protruding downward at a length more than twice the length of the tooth profile 21a.

Further, a spring 32 is stretched between the stay 5 and the panel 11 to bias the panel 11 so as to always rotate rearward with respect to the stay 5.

In this example configured as above, the tooth plate 2
In a state where the tooth profile 22a of the tooth plate 22 is engaged with the tooth profile 21a of the tooth plate 22, the panel 11 is locked backward with respect to the stay 5, and the headrest main body 4 is fixed. Pin 29
The tip of the guide plate 27 is in contact with the inner surface of the outer guide plate 27 (the position shown in FIG. 9A). When the headrest main body 4 is pressed forward from this state, the panel 11 is rotated about the shaft support relative to the stay 5 while the tooth profile 22a of the tooth plate 22 overcomes the tooth profile 21a of the tooth plate 21, and the tooth plate 22 also moves forward accordingly. Rotationally, the pin 29 slides along the inner surface of the outer guide plate 27 (positions A to B in FIG. 9).

When the panel 11 is further rotated, the support piece 31 at the tip of the tooth plate 22 moves to the inner guide plate 26 of the tooth plate 21.
The tooth plate 22 is pushed up and rotated against the biasing force of the spring 25 so that the tooth profile 22a is brought into sliding contact with the raised edge 26b from the peripheral edge 26a of the tooth disc 21.
This rotation causes the pin 29 to move further apart and disengage from the outer guide plate 2 of the gear 21.
The coil spring 3 comes off from the inner surface of 7 toward the periphery.
A protrusion 27b protrudes from the outer surface of the tooth plate 22 due to a biasing force of 0 and is formed on the peripheral edge 27a side of the outer guide plate 27.
(position C in FIG. 9), and the disengaged state of the tooth plate 22 with respect to the tooth disk 21 is maintained.

In this state, the panel 11 is rotated rearward with respect to the stay 5 by the biasing force of the spring 32, and this rotation causes the pin 29 of the tooth plate 22 to move rearward along the peripheral edge 27a of the outer guide plate 27 (the ninth
position in Figure D), the guide part 2 that is bent at an angle at the rear end.
7c (position E in Figure 9), the peripheral edge 27
a (position shown in Figure 9), so the tooth plate 2
2 is rotated downward by the biasing force of the spring 25, so that the tooth profile 22a meshes with the tooth profile 21a of the gear plate 21, and the support piece 31 is brought into contact with the peripheral edge 26a of the inner guide plate 26.

Then, when the panel 11 is rotated forward again with respect to the stay 5, the tooth plate 22 is moved forward with respect to the tooth plate 21 while riding over the meshing part, and the pin 29
is slid forward from the guide portion 27c of the outer guide plate 27 and retracted inwardly against the tooth plate 24 against the biasing force of the coil spring 30.

In this way, the same operation as described above is performed, and the panel 11 is engaged and rotated, that is, the headrest main body 4 is adjusted to tilt forward.

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 headrest. 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 the drawing]

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, FIG. 3 is a longitudinal sectional view thereof, and FIG. Fig. 5 is an exploded perspective view of the main parts, Fig. 5 is a perspective view of the fixed gear part, Fig. 6
The figure is a perspective view of the inner surface of the movable tooth plate portion, FIG. 7 is a sectional view taken along the line II in FIG. 9th
Figures A and B are explanatory diagrams of the operation. 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, 22 is a tooth plate, 26 is an inner guide plate, 27 is an outer guide plate, 29 is a pin, and 31 is a support piece.

Claims (1)

[Claims] 1. In a headrest device for a vehicle seat, etc., in which a headrest body is rotated in the front-rear direction relative to a stay supported by a seatback, and the rotation angle position with respect to the seatback can be adjusted, the headrest body is rotated in the longitudinal direction with respect to a stay supported by a seatback. An engagement mechanism is disposed that enables the headrest main body to engage and rotate forward and locks it from backward rotation, and the engagement mechanism includes an engagement release mechanism that releases the engagement when the headrest body is rotated forward by a predetermined angle. The meshing mechanism includes a tooth plate 21 fixed to the stay 5 side, and a movable side provided on the headrest main body 11 side and biased toward a tooth profile 21a provided on the outer periphery of the tooth plate 21 and meshing with the tooth plate 21. Consisting of a tooth plate 22,
The mesh release mechanism includes a support piece 31 protruding in the meshing direction of the movable tooth plate 22, a pin 29 that is biased toward the side surface of the tooth plate 21 by the movable tooth plate 22, and an inner surface of the tooth plate 21. an inner guide plate 26 that is fixed to the support piece 31 on which the support piece 31 slides and separates the movable side tooth plate 22 from the tooth profile 21a of the tooth plate 21;
1, the peripheral edge protrudes outward from the tooth profile 21a of the tooth disc 21, and the rear end is fixed to the outer surface of the tooth disc 21.
a head rest for a vehicle seat, etc., comprising an outer guide plate 27 that protrudes outward from the side surface of the seat 1 and moves the pin 29 from the inner surface to the peripheral edge side to move the head rest main body from the forwardmost position to the rearmost position. Device.