JPH0759629A - Head rest device for seat of vehicle - Google Patents

Abstract

PURPOSE:To enable fine adjustment for the longitudinal position of a head rest main body without changing the angle of inclination according to the form of a seating person, and to remarkably improve the safety by surely supporting the occipital part of a seating person. CONSTITUTION:A lead screw 35 extended in the vertical direction is driven in rotation by a driving motor 33 provided on a seat back 11 to move up and down an elevating base plate 39 through a nut 38. The lower end of a head rest stay 23 is supported on the elevating base plate 39, and the middle part of the head rest stay 23 is installed on an upper lateral rod 14 of a seat back frame 12. A lead screw 25 extended in the vertical direction is driven in rotation by a driving motor 24 for fine adjustment, which is fitted to the head rest frame 22 of a head rest device 21, whereby the outer frame side of the head rest main body 27 is moved up and down slightly through a nut 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headrest device for a vehicle seat, and more specifically, a headrest stay attached to the upper end of a seatback, and a headrest body fixed to the upper end of the headrest stay.
Vertically moving up and down means for vertically moving the headrest stay installed in the seat back, a seating sensor for detecting seating on a seat, and controlling the vertical moving up and down means when seating is detected by the seating sensor. The present invention relates to a headrest device for a vehicle seat, which includes an elevating control unit that raises a headrest stay to a predetermined neutral position.

[0002]

2. Description of the Related Art Generally, a vehicle seat or the like holds a seated person stably while the vehicle is traveling, provides a proper sitting comfort, and can be seated for a long time. It is desired to reduce the fatigue as much as possible, and a headrest device is attached to the upper end portion of the seat back so as to support the back head of the seated person.

As such a headrest device, various types of headrest devices have been conventionally known, and there is a headrest device which can be stored at the upper end of a seatback, and a lower end of the headrest stay is provided on the seatback. There is also known a headrest device for a vehicle seat in which a headrest stay is attached so as to be vertically adjustable by a vertically moving means including a motor or the like (Japanese Patent Laid-Open No. 62-101213).
Issue).

[0004]

However, in the conventional headrest device, the headrest main body is adjusted up and down on a straight line or moved up and down on a curved line. Is constant, the front-back position of the headrest main body changes according to this movement locus, and there is an unsolved problem that it is difficult to adjust the headrest position according to the body shape of the seated person.

Further, when the headrest main body draws a curved locus, the tilt angle of the headrest main body changes before and after the neutral position, and this change in tilt angle cannot be adjusted. There are also challenges. Further, when the headrest main body draws a linear movement locus, the higher the headrest main body is, the more a gap is generated between the headrest main body and the back of the head, which makes it impossible to obtain a stable feeling.

An object of the present invention is to make it possible to finely adjust the longitudinal position of the headrest main body in accordance with the body shape of the seated person without changing the inclination angle so that the back head of the seated person can be reliably supported, which is extremely safe. A headrest device for a vehicle seat that can be improved.

[0007]

The present invention has been made in view of the above-mentioned problems, and a headrest device for a vehicle seat according to claim 1 is a headrest stay mounted on an upper end side of a seatback, A headrest main body fixed to the upper end of the headrest stay, a vertically elevating means for vertically moving the headrest stay provided on the seat back, a seating sensor for detecting seating on a seat, and a seating sensor for detecting seating In a headrest device for a vehicle seat, comprising: a lifting control means for controlling the vertical lifting means to raise the headrest stay to a predetermined neutral position, the headrest body fixed between the headrest stays is Fine adjustment to finely move vertically along a trajectory different from the movement trajectory by the vertical lifting means Means descending, characterized in that a fine adjustment lifting mechanism fine adjustment drive means capable of driving controls.

The headrest device for a vehicle seat according to a second aspect of the invention is characterized in that the fine movement adjustment drive means is activated only when the headrest stay is in a predetermined neutral position. And

[0009]

According to the present invention, the headrest main body can be moved up and down by driving the up-and-down elevating means by the elevating and lowering control means to set the up-and-down position according to the body shape of the seated person. Since the means can finely move the headrest main body along a locus different from the movement locus by the vertical elevating means, for example, when the movement locus of the headrest main body by the vertical elevating means is on a curve, the fine adjustment elevating means causes the headrest main body to move. By finely moving, it is possible to make fine adjustments without changing the inclination angle of the headrest body, and it is also possible to adjust the front-back position of the headrest body. can do.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle seat headrest device according to the present invention will be described in detail below with reference to the drawings. 1 to 4 respectively show an outline of an embodiment of a headrest device for a vehicle seat according to the present invention. A seat back 11 of the vehicle seat shown in FIG. 1 includes a seat frame 12 and this seat. Pad material attached to the outer periphery of the frame 12,
Although it is formed of a skin material that covers the outer periphery of the pad material, only the configuration of the seat frame 12 is shown.

A recess 11a is formed in the center of the upper end of the seat back 11, and the headrest main body 27 of the headrest device 21 is accommodated in the recess 11a in a lowered state. The headrest device 21 is mounted so as to be vertically adjustable by vertical lifting means 31 provided on the seat frame 12 side of the seat back 11.

The headrest device 21 is shown in FIG.
As shown in (a) and (b), a vertical plate portion 22a extending in the left-right direction and a horizontal plate portion 22b extending rearward from the upper end thereof.
And an inner headrest frame 22 formed in a reverse L-shaped cross section, and pipe-shaped headrest stays 23, 23 hanging downward from the left and right ends of the horizontal plate portion 22b and having an insulating film formed on the outer peripheral surface thereof. And have.

The vertical plate portion 22 of the headrest frame 22
A fine adjustment drive motor 24 is arranged at a position between the headrest stays 23, 23 on the lower end surface side of a. The fine adjustment drive motor 24 is composed of a DC motor having a bevel gear 24a attached to the output shaft side.

The lower end of the lead screw 25 is connected to the vertical output shaft of the bevel gear 24a.
Is rotatably supported by the horizontal plate portion 22b of the headrest frame 22. This lead screw 25
A nut 26 is screwed into the shaft, and the nut 26 is fixed to the inner peripheral surface of the outer frame 27a of the headrest body 27, so that the headrest body 27 is vertically movable.

Here, the headrest main body 27 has an outer frame 27a formed of a hollow casing having an open lower end, a pad material arranged on the outer periphery of the outer frame 27a, and a skin material covering the outer periphery of the pad material. However, the illustration of the pad material and the skin material is omitted here.

Further, the fine adjustment drive motor 24, the lead screw 25, and the nut 26 constitute a fine adjustment elevating means 28. By driving the drive motor 24 in the normal direction, for example, the nut 26 moves upward to move the headrest body. 27
Rises, and dog 29 formed on nut 26 at the upper limit position
Contacts the limit switch LS1 to turn it off, and reversely rotates the drive motor 24 in reverse, whereby the nut 26 moves downward and the headrest body 27 descends.
At the lower limit position, the dog 29 comes into contact with the limit switch LS2 to turn it off.

Seat frame 1 of the seat back 11
An upper horizontal rod 14 and a lower horizontal rod 16 are provided between the left and right side frames 12a, 12a of the second horizontal frame 14.
A vertical moving means 31 is provided on the lower horizontal rod 16 and the rod.

The lower horizontal rod 16 is provided with an elevating drive motor 33 composed of a DC motor having an output side bevel gear 33a similarly to the fine adjustment drive motor 24, and the bevel gear of the drive motor 33 is provided. The lead screw 35 is connected to the vertical output shaft 33a.

An upper end portion of the lead screw 35 is rotatably attached to the upper horizontal rod 14 by a bracket 37. A nut 38 is screwed into the lead screw 35, and an elevating board 39 extending in the lateral direction is fixed to the nut 38.

Both side portions of the elevating board 39 are provided with upper horizontal rods 14.
And a pair of left and right guide members 4 provided between the lower horizontal rods 16
It is configured to move up and down along 1, 41. Pivot portions 43 are formed on both sides of the elevating board 39 to pivotally support the lower end of the headrest stay 23 in the front-rear direction.

Further, the headrest stay 2 having an upper lateral width 14
A pair of left and right bearings 4 is provided at a position where the intermediate part of 3, 23 moves up and down.
5, 45 are provided. This bearing portion 45 is shown in FIG.
As shown in (a) and (b), it is formed as a spherical bearing, but the point is that it can rotate the middle portion of the headrest stay 23 in the front-back direction.

The bearing portion 45 has, for example, a bearing 47 having a spherical surface inside and a sphere 48 rotatably supported by the bearing 47, and the headrest stay 23 is vertically movably inserted into the sphere 48. A through hole 49 is formed. A conventionally known headrest stay holder can be used instead of the bearing portion 45.

The bearing portion 45 is attached so as to be located in front of the upper end portion of the lead screw 35 attached to the upper lateral space 14. Headrest stay 23
Is for vertically moving the through hole 49 of the spherical body 48 of the bearing portion 45, and for rotating the spherical body 48 with respect to the bearing 47 when a force in the tilt direction is applied to the headrest stay 23.

Therefore, when the headrest device 21 is moved upward, for example, by rotating the elevating drive motor 33 in the forward direction, the elevating board 39 rises along the lead screw 35 and the lower end of the headrest stay 23 elevates. It rises with the substrate 39.

At this time, the bearing portion 4 of the headrest stay 23
Since 5 is located in front of the upper end of the lead screw 35 attached to the upper lateral space 14, as shown in FIG. 2, the headrest stay 23 is inclined forward as the elevating board 39 rises, When the neutral position at the upper end is reached, the dog 50 formed on the elevating board 39 comes into contact with the limit switch LS3, and the limit switch LS3 is turned off.

Further, the headrest device 2 in the upper position
When moving 1 downward, the lifting drive motor 33
By reversing, the elevating board 39 descends along the lead screw 35, and the lower end portion of the headrest stay 23 descends together with the elevating board 39.

The lower end of the headrest stay 23 is guided to the lower end of the lead screw 35, the headrest device 21 is housed in the recess 11a of the seatback 11, and the lower end of the headrest stay 23 is guided by the guide member 41.
And it is accommodated in the seat back 11 along the lead screw 35. Further, the lower end portion of the headrest stay 23 does not project to the back side of the seat back, and when it reaches the storage position at the lower end, the dog 50 causes the limit switch LS to move.
4 is touched and it is turned off.

A power cord 51, one end of which is connected to a drive circuit 61 described later, is inserted into the left headrest stay 23, and the other end of the power cord 51 is connected to both of the fine adjustment drive motors 24. A power cord 52 connected to a terminal and similarly connected to a drive circuit 61, which will be described later, is inserted into the right headrest stay 23, and the power cord 52 is fitted into a through hole formed in an intermediate portion of the headrest stay 23. It is connected to the electrical contact 53.

On the other hand, on the inner peripheral surface of the through hole 49 of the spherical body 48 of the bearing portion 45 which supports the headrest stay 23 on the right side, an electric contact 55 which is in contact with the electric contact 53 and constitutes a neutral position detecting switch NS is arranged. The electric contact 55 is connected to the positive electrode side of the battery 62.

The fine adjustment drive motor 24 and the elevation drive motor 33 are drive-controlled by the drive circuit 61 shown in FIG. That is, in the drive circuit 61, for example, a series circuit of a seating switch SD for detecting seating of an occupant installed in a seat cushion and a relay coil CA of the control relay LA is connected between the positive electrode side of the battery 62 and the ground. .

The movable contact tc of the control relay LA is directly connected to the positive electrode side of the battery 62, and the normally closed contact ta of the control relay LA is the relay coil C of the lifting control relay LB.
It is connected to the ground via B and the diode D
9 is connected to a descending contact td of a manual switch MS, which will be described later, and a normally open contact tb is connected to the ascending / descending control relay L.
It is connected to ground via a relay coil CC of C.

The movable contact tc of the lift control relay LB is connected to one of the connection terminals of the lift drive motor 33, and the normally closed contact ta is in the neutral position of the limit switch L.
The normally open contact tb is connected to the positive electrode side of the battery 62 via S3 to ground.

In addition, the movable contact t of the lifting control relay LC
c is connected to the other connection terminal of the elevating drive motor 33, the normally closed contact ta is connected to ground via the limit switch LS4 at the storage position, and the normally open contact tb is connected to the positive electrode side of the battery 62.

Further, the movable contact tc of the manual switch MS disposed on the door side of the seat cushion, for example, is connected to the positive electrode side of the battery 62 via the neutral position detection switch NS, and the ascending contact tu is for fine adjustment. It is connected to the ground via the relay coil CD of the control relay LD, the descending contact td is connected to the ground via the relay coil CE of the fine adjustment control relay LE, and the normally closed contact of the control relay LA described above. It is connected to ta.

Moving contact tc of the fine adjustment control relay LD
Is connected to one connection terminal of the fine adjustment drive motor 24, the normally closed contact ta is connected to the ground via the lower limit limit switch LS2, and the normally open contact tb is connected to the positive electrode side of the battery 62.

Moving contact tc of control relay LE for fine adjustment
Is connected to the other connection terminal of the fine adjustment drive motor 24, the normally closed contact ta is connected to ground via the upper limit switch LS1, and the normally open contact tb is connected to the positive electrode side of the battery 62.

Next, the operation of the above embodiment will be described. now,
If the occupant is not seated on the seat, the seating switch SD is off. In this non-seated state, the headrest device 21 is in the lower storage position, the lower limit switch LS4 is in the off state, and the upper limit switch L is
S3 is in the ON state, the neutral position detection switch NS is in the OFF state, the control relays LA to LE maintain the non-energized state, and the energizing circuits for the fine adjustment drive motor 24 and the elevation drive motor 33 are Since they are cut off, these drive motors 24 and 33 maintain the stopped state.

From this state, when the occupant gets on the seat cushion and sits down, the seating switch SD is turned on, so that the relay coil CA of the control relay LA is energized and its movable contact tc is switched from the normally closed contact ta side to the normally open contact tb side.

Therefore, the relay coil CC of the lifting control relay LC is energized, and its movable contact tc is switched from the normally closed contact ta side to the normally open contact tb side, whereby the lifting drive motor 33 is driven. The forward rotation side connection terminal is connected to the positive electrode side of the battery 62.

At this time, the other lifting control relay LB maintains the non-energized state and the upper limit switch LS3 is in the ON state, so that the reverse connection terminal of the drive motor 33 moves the lifting control relay LB. Contact tc, normally closed contact ta
And the upper limit switch LS3 is grounded, and the lifting drive motor 33 is in the normal rotation state.
Therefore, as described above, the elevation board 39 of the up-and-down elevating means 31 ascends, and the headrest device 21 as a whole rises.

After that, when the headrest device 21 reaches the upper neutral position, the upper limit switch L
Since S3 is turned off, the lifting drive motor 33
The energizing path to is cut off, the lifting drive motor 33 is stopped, and the headrest device 21 is held at the neutral position.

As described above, when the headrest device 21 reaches the neutral position, the neutral position detection switch NS is turned on, whereby the outer frame 2 of the headrest main body 27 by the manual switch MS is turned on.
Fine adjustment in the vertical direction on the 7a side is possible.

Therefore, when the movable contact tc of the manual switch MS is switched to the ascending side contact tu side in this state,
The relay coil CD of the fine adjustment control relay LD is energized, whereby the movable contact tc is switched from the normally closed contact ta side to the normally open contact tb side, and the fine adjustment drive motor 24
The forward rotation side connection terminal of is connected to the positive electrode side of the battery 62.

On the other hand, since the fine adjustment control relay LE continues to be in the non-energized state, the reverse rotation side connection terminal of the fine adjustment drive motor 24 has the movable contact tc and the normally closed contact ta of the fine adjustment control relay LE and the upper limit. The fine adjustment drive motor 24 is driven in the forward direction because it is grounded via the limit switch LS1.

Therefore, when the outer frame 27a side of the headrest main body 27 is moved upward to stop the operation of the manual switch MS when reaching the desired position, both the fine adjustment control relays LD and LE are not attached. The energized state cuts off the energization path of the fine adjustment drive motor 24, the fine adjustment drive motor 24 stops, and the rise of the headrest body 27 on the outer frame 27a side is stopped.

On the contrary, when the movable contact tc of the manual switch MS is switched to the descending side contact td, the relay coil CE of the fine adjustment control relay LE is energized, whereby the movable contact tc moves from the normally closed contact ta side. Normally open contact tb
, And the reverse rotation side connection terminal of the fine adjustment drive motor 24 is connected to the positive electrode side of the battery 62.

On the other hand, since the fine adjustment control relay LD continues to be in the non-energized state, the forward rotation side connection terminal of the fine adjustment drive motor 24 has the movable contact tc and the normally closed contact ta of the fine adjustment control relay LD. Since it is grounded via the lower limit switch LS2, the fine adjustment drive motor 24 is driven in reverse.

For this reason, when the outer frame 27a side of the headrest main body 27 is moved downward to stop the operation of the manual switch MS when reaching the desired position, both the fine adjustment control relays LD and LE are not attached. In the energized state, the energization path of the fine adjustment drive motor 24 is cut off, the fine adjustment drive motor 24 is stopped, and the lowering of the headrest body 27 on the outer frame 27a side is stopped.

After that, when the occupant stands up from the seat cushion to get off the vehicle, the seating switch SD is turned off, whereby the relay coil CA of the control relay LA is turned off and the control relay LA is turned off. The movable contact tc returns to the normally closed contact ta side from the normally open contact tb side, and the relay coil CB of the lifting / lowering control relay LB is energized to keep the movable contact tc normally. It is switched to the open contact tb side.

For this reason, the reverse rotation connection terminal of the lifting drive motor 33 is connected to the positive electrode side of the battery 62, and the forward rotation connection terminal is used for the movable contact tc and the normally closed contact ta of the lifting control relay LC, for the lower limit. Limit switch LS4
By being grounded via the
Is reversed, and as a result, the entire headrest device 21 descends.

After that, when the headrest device 21 reaches the storage position on the lower end side, the lower limit limit switch LS4 is turned off, so that the power supply path to the lifting drive motor 33 is cut off, and the lifting drive motor 33 is cut off. 33 is stopped, and the descent of the headrest device 21 is stopped.

On the other hand, also for the fine adjustment drive motor 24, when the control relay LA returns to the non-energized state,
Since the relay coil CE of the fine adjustment control relay LE is energized, it is energized and the movable contact tc becomes the normally open contact tb.
Switched to the side.

Therefore, the reverse rotation side connection terminal of the fine adjustment drive motor 24 is connected to the positive electrode side of the battery 62, and the forward rotation side connection terminal is the movable contact tc and the normally open contact ta of the fine adjustment control relay LD. And lower limit switch LS
It is grounded via 2.

As a result, the fine adjustment drive motor 24 is driven in the reverse direction, and the headrest body 27 descends. And
When the headrest main body 27 reaches the lower end position, the lower limit limit switch LS2 is turned off, the power supply path to the fine adjustment drive motor 24 is cut off, the fine adjustment drive motor 24 is stopped, and the headrest main body 27 Is stopped.

Thereafter, even if the manual switch MS is operated, the headrest device 21 is lowered from the neutral position, and the neutral position detection switch NS
Is off, the motor drive circuit through the manual switch MS is not configured.
Since the stopped state is maintained, fine adjustment of the headrest main body 27 is prohibited except at the neutral position. still,
The neutral position can be set appropriately. It is also possible to give a certain width to the neutral position.

As described above, according to the above-described embodiment, the headrest device 21 is automatically raised to the predetermined neutral position when the occupant is seated, and the headrest main body 27 is operated by operating the manual switch MS in this state.
The vertical position on the outer frame 27a side of the headrest main body 27 can be finely adjusted. In this case, only the outer frame 27a side of the headrest main body 27 is vertically moved, so that the headrest main body 27 can be moved in parallel. It is possible to prevent the contact surface of the 27 occupant with the back of the head from being inclined.

In the above embodiment, the drive circuit 61
Although the description has been given of the case where is configured by a sequence circuit using a relay, the present invention is not limited to this, and a microcomputer may be applied for software control.

Further, in the above embodiment, the vertical movement mechanism 31 of the headrest device 21 and the headrest body 2 are used.
The case where a linear movement mechanism composed of a lead screw and a nut screwed with the lead screw is applied as the fine adjustment movement unit 7 has been described, but the present invention is not limited to this, and linear movement by another rack and pinion is used. Any moving mechanism such as a mechanism can be applied.

Furthermore, in the above embodiment, the case where the headrest device 21 is moved along the arcuate surface by the vertical movement mechanism 31 has been described, but the invention is not limited to this, and the headrest device 21 can be moved linearly. Well,
In this case, the ascending / descending direction of the fine adjustment lifting / lowering means is selected to intersect with the moving direction of the vertically moving mechanism.

Furthermore, the present invention is not limited to the structure of the above-described embodiment, and the headrest device 21 and the seat back 11 are provided.
It is possible to arbitrarily change or change the shape, structure, etc. of each part including, if necessary.

[0061]

The above is the configuration of an embodiment of the headrest device for a vehicle seat according to the present invention. According to such a configuration, the headrest stay attached to the upper end side of the seatback and the headrest stay. A headrest main body fixed to the upper end of the seat, an up-and-down elevating means for vertically moving the headrest stay provided on the seat back, a seating sensor for detecting seating on a seat, and a seating sensor for detecting seating A headrest device for a vehicle seat, comprising: a vertical movement control means for controlling the vertical movement means to raise and lower the headrest stay to a predetermined neutral position; and a vertical movement of the headrest body fixed between the headrest stays. A fine adjustment elevating means for finely moving up and down along a trajectory different from the movement trajectory by the means; Since fine adjustment drive means capable of driving and controlling the adjustment lifting means is provided, when the seating is detected, the up and down lifting means raises the entire headrest device to a predetermined neutral position, and then the fine adjustment lifting means moves the headrest body. The headrest body can be finely adjusted without changing the tilt angle of the headrest body, and the position of the headrest body in the front-rear direction can be adjusted. Therefore, the safety can be remarkably improved. Further, since the fine adjustment elevating means is operable only when the headrest device is in the predetermined neutral position, it is possible to prevent the fine adjustment elevating means from being acted on carelessly.

[Brief description of drawings]

FIG. 1 is a front view of a frame configuration of a main part of a vehicle seat headrest device according to the invention.

FIG. 2 is an explanatory side view of a headrest device according to the present invention in a vertical ascending / descending state.

3A and 3B show a bearing portion of a headrest stay of a headrest device according to the present invention, in which FIG. 3A is a perspective view and FIG.
Is a cross-sectional view.

FIG. 4 is an enlarged view of a main part of a headrest device according to the present invention, in which (a) is a front view and (b) is a sectional view.

FIG. 5 is a circuit diagram showing a drive circuit of a headrest device according to the present invention.

[Explanation of symbols]

 11 Seat Back 12 Seat Frame 21 Headrest Device 22 Headrest Frame 23 Headrest Stay 24 Fine Adjustment Drive Motor 25 Lead Screw 26 Nut 27 Headrest Main Body 27a Outer Frame 28 Fine Adjustment Elevating Means 31 Vertical Elevating Means 33 Elevating Driving Motors 35 Lead Screws 38 Nut 39 Lifting board 61 Drive circuit 62 Battery SD Seating switch MS Manual switch NS Neutral position detection switch LA Control relay LB, LC Lifting control relay LD, LE Fine adjustment control relay LS1 to LS4 Limit switch

Claims (2)

[Claims] 1. A headrest stay attached to an upper end side of a seatback, a headrest main body fixed to an upper end of the headrest stay, and a vertically elevating means for vertically moving the headrest stay provided on the seatback. A seating sensor for detecting seating on the seat,
A headrest device for a vehicle seat, comprising: an elevation control means for controlling the up-and-down elevating means to raise the headrest stay to a predetermined neutral position when the seating sensor detects a seat, and fixing the headrest stay between the headrest stays. And a fine adjustment drive means capable of driving and controlling the fine adjustment elevating means. A headrest device for a vehicle seat, characterized by: 2. The headrest device for a vehicle seat according to claim 1, wherein the fine movement adjustment drive means is configured to be in an operating state only when the headrest stay is in a predetermined neutral position. .