JPH0420279Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a headrest device installed in a vehicle seat, etc., and in particular, the headrest body is directly rotated to determine the rotation angle relative to the seat back, that is, the distance from the head of the seated person. This allows for easy adjustment.

BACKGROUND TECHNOLOGY AND PROBLEMS Conventionally, this type of headrest device has a gear mechanism that is always in mesh between the headrest body and a rotation support member, and this gear mechanism is rotated by a knob attached to the headrest body. The rotation angle of the headrest body can be adjusted by operation, or the rotation support member is equipped with a locking mechanism, and this locking mechanism can be unlocked by operating a button from the outside to rotate the headrest body and adjust the angle. There are some known examples.

However, in a headrest device with such a configuration, the rotational support portion of the headrest body is always in mesh with gears or locked by a lock mechanism, so the rotation angle can be adjusted by rotating the knob in both the front and rear directions, or by rotating the knob in both the front and rear directions. This has the disadvantage that quick adjustments cannot be made because buttons must be operated.

Purpose of the invention The present invention has been made in view of the above points, and aims to eliminate the above-mentioned drawbacks by providing a headrest device that can adjust the rotation angle by simply rotating the headrest body directly. It is.

Summary of the invention In order to achieve the above-mentioned object, the present invention includes a shaft that is suspended horizontally on a headrest support section provided at the upper part of the seat bag, and a headrest main body that is rotatably supported in the front and back directions on both side surfaces of the shaft. a frame body; a first spring disposed between the shaft and the frame body and biasing the frame body rearward;
A fan-shaped tooth plate that is fixed to the shaft and has a plurality of additional teeth inclined forward on the periphery, and at least one side is formed in an arc shape toward the distal end, and a frame is formed at the base end corresponding to the additional teeth of the tooth plate. The claw piece is pivotally attached to the side surface of the body, and this claw piece is biased to rotate in the direction of the shaft by a second spring disposed between it and the shaft, and the claw piece is rotated in the direction of the shaft. As the frame rotates to the rear, it sequentially engages with the additional teeth of the tooth plate, and when it passes the front end of the tooth plate, the engagement is released, allowing the frame to return to the rear. As the tooth rotates, it comes into contact with the front end of the tooth plate and is reversed in a direction where it does not engage with the additional tooth, and moves backward while sliding in contact with the additional tooth on its arcuate surface, passing over the rear end of the tooth plate. By rotating the frame forward in this state, the frame body contacts the rear end of the tooth plate, rotates forward, and engages with the additional tooth again, thereby directly rotating the head rest body. This realizes a headrest device that can adjust the angle in the front-rear direction.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a vehicle seat to which the headrest device of the present invention is applied, in which a frame 3 extends upward from both sides of a seat back 2 of a seat 1.
A headrest main body 4 is supported by a and 3b so as to be able to adjust its rotational angle in the front-back direction.

Reference numeral 5 denotes a frame disposed inside this headrest main body 4. This frame 5 is formed by surrounding substantially the entire circumferential surface between both side plates 5a and 5b with a plate body 5c. The shaft 8 is rotatably supported in the front-rear direction through a shaft hole 6 drilled in the lower part of the frame 3a and a shaft 8 which is horizontally fixed between the upper parts of the frames 3a and 3b via mounting plates 7a and 7b.

A ratchet type rotation angle adjustment mechanism 10 is arranged between one side plate 5a and the shaft 8. This rotation angle adjustment mechanism 10 consists of a toothed plate 11 fixed to the shaft 8 and a claw piece 12 pivotally attached to one side plate 5a of the frame 5 by a shaft pin 12'. A plurality of additional teeth 13 [1
3a, 13b, 13c] are formed, and the claw piece 12 is formed in a substantially arc shape with a sharp tip,
A coil spring 15 is stretched between the protrusion 14 protruding from the side surface and the shaft 8, and the biasing force of the coil spring 15 urges the claw piece 12 to rotate in the direction of the shaft 8, thereby creating a concave curved shape. Front side is tooth plate 1
1, its tip 12a is facing the tooth plate 11.
It is made so that it meshes with one of the additional teeth 13 of.

A coil spring 18 is stretched between a bracket 16 fixed toward the rear near one end of the shaft 8 and a bracket 17 fixed to the back side of the front side of the frame 5. Due to the biasing force of the spring 18, the frame body 5 is moved against the shaft 8.
That is, they are urged to rotate rearward relative to the frames 3a, 3b.

Further, at a predetermined position on one side plate 5a of the frame body 5, there is a plate for preventing the frame plate 5 from rotating more than necessary when the frame plate 5 is rotated forward with respect to the shaft 8, as will be described later. A stopper piece 19 is provided protrudingly.

In addition, the frame 3 as a headrest support part
a and 3b may be formed in the shape of a headrest stay; in this case, a guide hole or opening long in the front-rear direction is formed on the lower surface side of the circumferential plate 5c of the frame 5, and the stay is inserted through this.

Next, the operation of the headrest device of this example configured as described above will be explained.

Now, when the headrest main body 4, that is, the frame plate 5 is in an upright state located on the same plane as the seat bag 2, the rotation angle adjustment mechanism 10 is rotated by the solid line in FIG.
As shown in Figure A, the tip 12a of the claw piece 12 is connected to the tooth plate 1
1, so as to be in pressure contact with the tooth groove of the rearmost additional tooth 13a by the biasing force of the coil spring 15,
Therefore, the frame body 5 has a shaft 8, that is, a frame 3a,
3b is prevented from rotating rearward, and the headrest main body 4 is held in an upright state against the pressing force from the front.

From this state, when the headrest main body 4 is pushed forward with a required force against the biasing force of the coil spring 18, the frame 5 is pivoted to the shaft 8, i.e., forward about the shaft holes 6 of both side plates 5a and 5b. With this, the claw piece 12 also moves forward, so that the tip end 12a of the claw piece 12 is sequentially engaged with the additional teeth 13b and 13c in front of the tooth plate 11, and this engagement causes the frame body to move forward. 5 is held tilted forward, and the headrest main body 4 is positioned tilted forward at a desired rotation angle. (See the two-dot chain line in Figure 4 and Figure 5B).

Therefore, the headrest main body 4 is tilted most forward, that is, the tip 12a of the claw piece 12 of the rotation angle adjustment mechanism 10 is engaged with the tooth groove of the additional tooth 13c at the frontmost part of the tooth plate 11 (see Fig. 5B). Reference) and further frame body 5
When pressed and rotated forward, the engagement between the claw piece 12 and the tooth plate 11 is released, and the tip part 12a of the claw piece 12 climbs over the front end part 11a of the tooth plate 11, and the claw piece 12 The distal end portion 12a is directed toward the shaft 8 by the biasing force of the coil spring 15 and corresponds to the lower side of the front end portion 11a of the tooth plate 11 (see FIG. 5C).

In this state, the stopper piece 19 of the frame 5 comes into contact with the rear edge of the tooth plate 11, and the frame 5 is prevented from rotating forward.

Then, when the pressing force on the headrest body 4 is relaxed or released from this state, the frame body 5 is rotated backwards by the biasing force of the coil spring 18, and the claw pieces facing in the direction of the shaft 8 are accordingly rotated. 12 is inverted so that its tip 12a comes into contact with the front end 11a of the tooth plate 11 and is flipped forward, that is, in a direction that does not engage with the additional tooth 13 (see FIG. 5D), and the tip 12a contacts the front end 11a of the tooth plate 11. 13, the convexly curved rear surface slides on this and moves rearward (see Fig. 5E).

When the frame body 5 is rotated backward in this manner, the claw piece 12 passes over the rear end portion 11b of the tooth plate 11 and is again brought into a state where the tip portion 12a is directed toward the shaft 8 by the coil spring 15. (see Figure 5 F),
From this state, the headrest main body 4, that is, the frame 5
When the headrest body 4 is rotated forward, the tip 12a of the claw piece 12 engages with the rearmost tooth 13a of the tooth plate 11, as shown in FIG. Retained.

In this way, the headrest device of this example is moved and engaged in a step-by-step manner by pressing and rotating the headrest body 4 forward with a required force, and when the rotation of the headrest body 4 is stopped at a desired adjustment position, the headrest body 4 is moved and engaged. The main body 4 is held fixed at that position, and when the headrest main body 4 is rotated beyond the adjustable range, the engagement is automatically released, and from this state, the headrest main body 4 is rotated back to the rearmost position and then rotated again. Since it is configured so that stepwise adjustment can be made again by rotating it forward, the seated person can quickly adjust the rotation angle to a desired angle with a simple operation.

Effects of the Invention As described above, according to the headrest device of the present invention, the desired rotation angle can be quickly adjusted by the extremely simple operation of directly pressing the headrest body forward without operating any operating members such as knobs or buttons. It can be adjusted, and since no operating members protrude from the outer periphery of the headrest body, safety for the occupants is improved.In addition, the structure is simple and the number of parts is small, making it possible to reduce costs and weight. Furthermore, in the configuration of this headrest device, the headrest main body is always urged backward by the spring, and one claw piece engages with the tooth plate in response to this urging force. As a result, the headrest main body is locked, so although the structure is simple, the headrest main body is securely and firmly fixed at the desired rotational angle position without wobbling, and the seated person can always have a comfortable seating feeling. It also has a profit. In addition, in the headrest device of the present invention, when the headrest main body is rotated rearward, the claw piece slides into contact with the additional teeth of the tooth plate on the arcuate surface, so that it moves smoothly.
This has the effect of allowing smooth rearward rotation of the headrest body.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a vehicle seat equipped with a headrest device of the present invention, Fig. 2 is a partially cutaway perspective view of the headrest device of the present invention, Fig. 3 is a rear view of the seat, and Fig. 4 is a rear view of the same. , a longitudinal side view, and FIGS. 5A to 5F are explanatory diagrams of the operation of the rotation angle adjustment mechanism. In the figure, 2 is a seat bag, 3a and 3b are frames, 4 is a headrest body, 5 is a frame, 8 is a shaft, 11 is a tooth plate, 11a is a front end, 11b is a rear end, 12 is a claw piece, and 13 [ 13a, 13b, 13
c] is an additional tooth.

Claims (1)

[Scope of Claim for Utility Model Registration] A shaft that is suspended horizontally on a headrest support section provided at the top of a seat bag, a frame of a headrest main body that is rotatably supported in the front and rear directions on both side surfaces of the shaft, and the above-mentioned. a first spring disposed between the shaft and the frame body and urging the frame body rearward; a fan-shaped tooth plate fixed to the shaft and having a plurality of additional teeth inclined forward on the periphery; , at least one side surface is formed in an arc shape in the direction of the distal end, and a claw piece is pivotally attached to the side surface of the frame body at the base end corresponding to the additional tooth of the tooth plate, the claw piece is , is biased to rotate in the direction of the shaft by a second spring disposed between the frame and the shaft, and is sequentially engaged with the additional teeth of the tooth plate by forward rotation of the frame. However, when the front end of the toothed plate is exceeded, the engagement is released and the frame body can be rotated back to the rear, and as the frame body is rotated backward, the front end of the toothed plate is is reversed in a direction in which it does not engage with the additional tooth, and moves backward while slidingly contacting the additional tooth on the arcuate surface, and rotates the frame forward while passing over the rear end of the tooth plate. When the head rest device is moved, it comes into contact with the rear end of the tooth plate, rotates forward, and engages with the additional teeth again.