JPH06105728A - Headrest device for vehicle seat - Google Patents

Abstract

(57) [Abstract] [Purpose] When the stay fixed to the headrest body is immovably locked with respect to the holder fixed to the seat back, the stay is firmly held and abnormal noise due to its vibration is prevented. We propose a headrest device for automobiles. [Structure] When the stay 9 is locked with respect to the holder 11, the stay holding member 28 fitted around the stay 9 firmly holds the stay 9 and prevents the stay 9 from vibrating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat headrest device having a headrest body for supporting the head of an occupant seated on the seat.

[0002]

2. Description of the Related Art A headrest device arranged in a vehicle such as an automobile is designed to fit the body of an occupant sitting on a seat,
It is configured so that the height of the headrest main body can be adjusted (see, for example, Japanese Utility Model Publication No. 51-24664 and Japanese Patent Application Publication No. 59-55215).

In a conventional headrest device of this type, a stay fixed to a headrest body is vertically movably fitted into a cylindrical holder fixed to an upper part of a seat back and housed in the holder. The engagement body is configured to engage with the engagement recess formed on the peripheral surface of the stay and hold the headrest body at a desired height position.

However, when a vibrating force is applied to the headrest device and the stay vibrates when the vehicle is running, the stay hits the engaging body, and abnormal noise is generated due to the collision between the two. This abnormal noise is an extremely small noise called "chuckling", but as the quietness inside the vehicle increases, a slight noise may be heard by the occupant, which may cause great discomfort to the occupant.

In the headrest device disclosed in Japanese Patent Laid-Open No. 59-55215, the engaging body is formed in a ring shape,
The stay is configured to pass through the center hole,
Usually, the engaging body is biased upward by a spring, and the engaging body is held at a tilted lock position by a stopper so that the upper edge portion and the lower edge portion of the engaging body center hole are provided at two positions. Since the vertical movement of the stay is prohibited by engaging with the engaging recess formed in the head, it is possible to enhance the effect of suppressing the vibration of the stay, but even when the vibrating force applied to the headrest device is strong. It is difficult to prevent the generation of abnormal noise.

Therefore, as disclosed in Japanese Utility Model Laid-Open No. 61-79954, a headrest device has been proposed which prevents the vibration by increasing the frictional force between the stay and the holder and suppressing the stay. However, according to this structure, when the stay is moved up and down, a large frictional force acts on the stay, which inevitably causes a problem that the operability is deteriorated.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to improve the headrest device disclosed in Japanese Patent Laid-Open No. 59-55215 and to more surely suppress a problem that an abnormal noise is generated while the vehicle is running. It is to provide a headrest device for a vehicle seat.

[0008]

In order to achieve the above object, the present invention provides a headrest main body for supporting a head of an occupant seated on a seat, a headrest main body fixed to the headrest main body, and protruding downward from the main body. A stay, a cylindrical holder fixed to the upper portion of the seat back, in which the stay is vertically movably fitted, and a central hole accommodated in the holder and through which the stay is inserted are provided. A ring-shaped engagement body, a spring for urging the engagement body upward, a stopper for holding the engagement body urged by the spring in an inclined lock position, and the engagement body, An operating lever for actuating the engaging body from the locked position to a substantially horizontal unlocked position against the action of the spring, and the engaging body has a locked position on the circumferential surface of the stay. Fortune telling At this time, a plurality of pairs of engaging recesses are formed at intervals in the longitudinal direction of the stay so that the upper edge portion and the lower edge portion of the center hole are engaged with each other to inhibit the stay from moving up and down. In a headrest device for a vehicle seat, when the united body occupies the unlocked position, the engagement recess of the stay is disengaged from the upper edge and the lower edge of the engagement body, and the stay is allowed to move up and down. A stay holding member fitted around a stay portion lower than a stay portion with which the engaging body is fitted, the stay holding member being located between a locked position and an unlocked position of the engaging body. Is connected to the engaging body via a connecting rod so that the stay holding member is fitted around the stay holding member when the engaging body occupies the lock position. Reduced diameter due to reaction force from the combined holder , Which is elastically deformable in the radial direction so as to hold the stay in pressure contact with the peripheral surface of the stay and to expand the diameter when the engagement body occupies the unlock position to allow the stay to move in the vertical direction. The proposed configuration is proposed.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a seat arranged in a passenger compartment of an automobile, which is an example of a vehicle. The seat 1 includes a seat cushion 2 for supporting the back of a seated person and a seat back 3 for supporting the back of the seated person. It has a headrest device 4.

As shown in FIG. 2, which is an enlarged sectional view taken along line II-II of FIG. 1, the seat back 3 has a pad 5 and a skin 6 covering the pad 5, and a bracket 7 is provided on a seat back frame (not shown). It is fixed.

The details of the headrest device 4 are as follows.

The headrest device 4 has a headrest body 8 for supporting the head of an occupant seated on the seat 1.
A pair of stays 9, 9a is fixed to the main body 8, and the stays 9, 9a project below the headrest main body 8. The headrest body 8 and the stays 9 and 9a may be fixed to each other such that they cannot move relative to each other, or the headrest body 8 may be fixed to the stays 9 and 9a so as to be tiltable in the front-rear direction.

On the other hand, a cylindrical holder 11 is fixed to the upper part of the seat back 3, and a stay 9 is fitted inside the holder 11 so as to be vertically movable. The holder 11 is the seat back 3
The holder 11 is fixed to the bracket 7 and the upper portion of the holder 11 is exposed to the outside of the seat back 3.

The inside of the holder 11 is composed of a large-diameter space 12 at the top and a small-diameter space 13 at the bottom, and the stay 9 vertically penetrates the inside of these spaces 12, 13.

The large-diameter space portion 12 of the holder 11 has a ring-shaped engaging body 15 having a central hole 14 through which the stay 9 is inserted.
The engagement body 15 is urged upward by a compression coil spring 16 placed on the stepped bottom of the large-diameter space 12.

In the large-diameter space 12 of the holder 11,
A ring-shaped stopper 17 is accommodated, and this stopper 17
The stay 9 is slidably fitted in the through hole 18 of the. The lower surface of the stopper 17 is an inclined inclined surface 19, and the engaging body 15 biased by the spring 16 as described above contacts the inclined surface 19 of the stopper 17 and is held in this position in an inclined posture. To be done. The position of the engaging body 15 that is inclined in this way is the lock position.

Large diameter space 12 formed in the holder 11
In the annular groove 20 formed on the uppermost peripheral surface of the
1 is fitted, and the stopper 21 is
7, the engagement body 15 and the spring 16 are prevented from coming out of the holder 11.

The lower end portion of the operating lever 22 is fixed to the engaging body 15, and the knob portion 23 on the upper end side of the lever 22 is fixed.
Are exposed to the outside of the holder 11. The stopper 17 has a notch 17 for preventing interference with the operation lever 22.
a is formed.

When the knob portion 23 of the operating lever 22 connected to the engaging body 15 is pushed downward as shown by the arrow P in FIG. 2, the engaging body 15 resists the action of the spring 16 and is shown in FIG. From the locked position, it operates to the substantially horizontal unlocked position shown in FIG. When the force applied to the operation lever 22 is released, the engagement body 15 tilts again to the lock position shown in FIG.

On the other hand, on the peripheral surface of the stay 9, a pair of engaging recesses 24 and 25 are formed so as to be staggered, and the pair of engaging recesses 24 and 25 are predetermined in the longitudinal direction of the stay 9. Are formed at intervals of.

When the engagement body 15 is biased by the spring 16 to occupy the locked position of the inclined state shown in FIG. 2, the upper edge portion 26 and the lower edge portion 27 of the center hole 14 of the engagement body 15 form a pair. The engaging recesses 24 and 25 are engaged with each other. As a result, the stay 9 is prohibited from moving up and down, and the headrest body 8 is fixedly held in that position.

The other stay 9a shown in FIG. 1 is fitted into the holder 11a (see FIG. 1) fixed to the upper portion of the seat back 3 in exactly the same manner as shown in FIGS. However, in this example, the stay 9a is slidably fitted to the holder 11a in which the elements 15, 16, 17, ... Shown in FIGS. 2 and 3 are not housed.

When adjusting the height position of the headrest body 8, the knob portion 23 of the operation lever 22 is pushed down to operate the engaging body 15 to the unlock position shown in FIG.
At this time, since the engaging body 15 takes a substantially horizontal posture, the upper edge portion 26 and the lower edge portion 27 of the engaging body 15 are engaged with the engaging concave portion 2 of the stay 9.
4, 25 are disengaged and the engagement of both is released. At this time, the other stay 9a is originally in a state where it can freely move up and down, so that both stays 9 and 9a can slide freely with respect to the holders 11 and 11a.

Therefore, the headrest body 8 is moved up and down together with the stays 9 and 9a to bring it to a desired height position. Then, when the force applied to the operation lever 22 is released, the engaging body 15 tilts again to the lock position shown in FIG. 2, and the upper edge portion 26 and the lower edge portion 27 of the engaging body 15 are engaged with the engaging recesses 24, 25 of the stay 9. And the headrest body 8 is fixedly held at a desired height position.

Even when the force applied to the operation lever 22 is released, the upper edge portion 26 and the lower edge portion 27 of the engaging body 15 do not match any one of the engaging concave portions 24, 25 of the stay 9. , If the stay 9 is moved slightly up and down, the upper edge 26
And the lower edge 27 are the engagement recesses 24, 25 closest to them.
The headrest body 8 can be fixedly held at the height position at this time.

It is also possible to omit the stay 9a and to support the headrest body 8 so that it can be adjusted up and down by one stay 9.

The configuration of the headrest device 4 described above is the same as that disclosed in Japanese Patent Laid-Open No. 59-55215. With this configuration, when the headrest main body 8 is held immovably, the upper edge portion 26 and the lower edge portion 27 of the engaging body 15 engage with the engaging recessed portions 24 and 25 of the stay 9, and the stay 9 is held at two positions. Therefore, even when the headrest device 4 is driven by a vehicle and a vibrating force is applied to the headrest device 4, it is possible to prevent the stay 9 from vibrating violently and reduce the occurrence of abnormal noise due to the collision between the stay 9 and the engagement body 15. It is possible. However, with the above configuration alone, the car runs on a bad road,
When the vibrating force is particularly strong, the stay 9 vibrates again, and abnormal noise is inevitably generated.

Therefore, in the illustrated headrest device, a stay holding member 28 is provided as shown in FIG. 1 and FIG. 2 in addition to the above-mentioned components. The stay holding member 28 is fitted around the stay portion below the stay portion to which the engaging body 15 is fitted, and the stay holding member 28 has an upper portion on which a pair of connecting rods also shown in FIG. The lower end of 29 is fixed, and the upper end of the connecting rod 29 is pivotally attached to the engaging body 15 via a pin 30. Pin 30
Is slidably fitted in a long hole 15a formed in the engaging body 15.

As described above, since the stay holding member 28 is connected to the engaging body 15 via the connecting rod 29, the engaging body 15 has the locked position shown in FIG. 2 and the unlocked position shown in FIG. When the space is operated, it operates in the vertical direction in conjunction with this. That is, the stay holding member 28 moves between the uppermost position shown in FIG. 2 and the lowermost position shown in FIG. 3 in association with the operation of the engagement body 15.

On the other hand, as shown in FIG. 3, the stay holding member 28 is formed such that the lower portion thereof spreads in a free state where no external force is applied, and the holding member 28 has
Preferably, two or more vertical slits 31 are formed.
This allows the stay holding member 28 to move in the radial direction,
It can be elastically deformed in the direction of diameter reduction. As shown in FIG. 2, the lower portion of the holder 11 is fitted around the stay holding member 28 so as to be relatively slidable.

When the engaging body 15 occupies the locked position shown in FIG. 2, the stay holding member 28 is elevated to the uppermost position, and at this time, most of the stay holding member 28 (or the whole thereof) is. It goes inside the holder 11.
Therefore, the stay holding member 28 receives a reaction force from the holder 11 fitted around the stay holding member 28, and the diameter is reduced by this force.
Therefore, the stay holding member 28 strongly presses the peripheral surface of the stay 9 to firmly hold the stay 9. That is, stay 9
Is not only prevented from moving up and down by the upper edge portion 26 and the lower edge portion 27 of the engaging body 15 engaged with the engaging concave portions 24, 25, but also firmly held by the stay holding member 28. Therefore, even if a vibration force is applied to the stay 9, the vibration is suppressed, and it is possible to effectively prevent the generation of abnormal noise due to the collision between the stay 9 and the engagement body 15.

On the other hand, as shown in FIG. 3, when the engaging body 15 occupies the unlocked position, the stay holding member 28 descends to the lowest position, so that the stay holding member 28 projects largely downward from the holder 11 and thus from the holder 11. Receives little or no reaction force, and the stay holding member 28 expands in diameter due to its elasticity. For this reason, the pressure contact state between the stay holding member 28 and the stay 9 is released, and the stay 9 can freely move up and down with respect to the stay holding member 28 as described above, and the headrest main body 8 has a desired height. Can bring to position.

As described above, since the stay holding member 28 is elastically deformable so as to be reduced or expanded in the radial direction, it is possible to effectively suppress the generation of abnormal noise of the headrest device 4, and further, to suppress the headrest. When adjusting the height position of the main body 8, it is possible to allow the stay 9 to move in the vertical direction, thereby preventing a problem that the operability thereof is deteriorated.

The present invention can be applied to a headrest device arranged in various vehicles other than automobiles without any trouble.

[0036]

According to the present invention, since the stay can be firmly held by the engaging body and the stay holding member, the vibration of the stay is suppressed and the abnormal noise is generated even when a large vibration force is applied to the headrest device. It is possible to prevent the malfunction. Moreover, when adjusting the headrest body up and down,
No large resistance is applied to the stay, and it is possible to prevent the operability from being deteriorated.

[Brief description of drawings]

FIG. 1 is a perspective view of a seat having a headrest device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II in FIG.

FIG. 3 is a view when the engagement body is operated to an unlock position,
FIG. 3 is a sectional view similar to FIG. 2.

4 is a sectional view taken along line IV-IV in FIG.

[Explanation of symbols]

 1 seat 3 seat back 4 headrest device 8 headrest body 9 stay 11 holder 14 center hole 15 engagement body 16 spring 17 stopper 22 operation lever 24 engagement recess 25 engagement recess 26 upper edge 27 lower edge 28 stay holding member 29 connection rod

Claims (1)

[Claims] 1. A headrest body for supporting a head of an occupant seated on a seat, and a headrest body fixed to the headrest body,
And a stay protruding below the main body, a cylindrical holder fixed to the upper part of the seat back and fitted with the stay so as to be movable in the vertical direction, and housed inside the holder, and A ring-shaped engagement body having a center hole through which the stay is inserted, a spring that urges the engagement body upward, and a stopper that holds the engagement body urged by the spring in an inclined lock position, An operating lever connected to the engagement body for operating the engagement body from the locked position to a substantially horizontal unlocked position against the action of the spring; When the engaging body occupies the lock position, a pair of engaging concave portions that prevent the stay from moving up and down by engaging the upper edge portion and the lower edge portion of the center hole thereof in the longitudinal direction of the stay. Multiple pairs are formed at intervals and the engaging bodies are In the headrest device for a vehicle seat, wherein when the lock position is occupied, the engagement recess of the stay is disengaged from the upper edge portion and the lower edge portion of the engagement body, and the vertical movement of the stay is allowed. The stay holding member is fitted around the stay portion below the stay portion to which the united body is fitted, and the stay holding member is provided for actuation between the locked position and the unlocked position of the engaging body. In order to operate in the vertical direction in conjunction with each other, the stay holding member is connected to the engaging body through a connecting rod, and the stay holding member is provided with:
The stay is compressed by the reaction force from the holder fitted around the stay holding member to press the peripheral surface of the stay to hold the stay, and when the engaging body occupies the unlocked position, the stay is expanded. To allow the vertical movement of
A headrest device for a vehicle seat, which is elastically deformable in a radial direction.