JPS6346934A - Head rest device for vehicle - Google Patents

Abstract

PURPOSE:To sufficiently ensure the strength of a head rest-holding mechanism and to usefully support a head part of passengers, by constituting a head rest device of a base part, turning shaft, head rest held to the turning shaft and a driving gear of the turning shaft and turning the turning shaft so as to place the head rest tumbling and rising for a seat. CONSTITUTION:A head rest device is constituted of a base part 1 held to the upper end part of a seat, turning shaft 2 rotatably held to the base part 1 almost in a horizontal direction, head rest 3 held to the turning shaft 2 accepting the head part of a passenger and a driving gear 4 turning the turning shaft 2 provided in the base part 1 by a predetermined angle in the peripheral direction of the turning shaft 2. And the driving gear 4 turns the turning shaft 2 so that the head rest 3 is placed tumbling and rising for the seat. Consequently, no arm for swiveling the head rest 3 is used, and holding strength of the head rest 3 can be usefully ensured by the extent of no use of the arm.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a headrest device for a vehicle. The present invention
It can be used in a headrest device attached to an automobile seat.

[Prior Art] A headrest device protrudes from the top of a car seat, and is designed to protect the head of an occupant when a car collides from behind.

By the way, the headrest ftH of this vehicle always protrudes from the top of the seat. Therefore, various problems may occur. For example, in a headrest IA mounted on a rear seat of an automobile, the headrest always protrudes from the rear seat, which tends to obstruct the driver sitting in the front seat from looking rearward. In order to solve this problem, the lower end of the headrest and one end of the arm are connected, and the other end of the arm is connected to the sea frame, and the other end of the arm is used as the center of swing. 2. Description of the Related Art A headrest device is known in which a headrest is swung by manually swinging an arm in the vertical direction, thereby allowing the headrest to be taken out or stored as appropriate. This headrest device was developed in the 1980s.
This is a headrest device according to the March-7134 publication. In the headrest device δ disclosed in Japanese Patent Application Laid-Open No. 60-71343, the headrest can be stored when not in use, thereby improving the problem of obstructing the driver's rear visibility.

However, since the lower end of the headrest is connected to one end of the arm and the other end of the arm is connected to the seat frame, the length of the arm is Since the arm is long, a large force tends to be applied to the other end, which is the pivot point of the arm. Therefore, there is a possibility that sufficient strength of the headrest cannot be obtained.

[Problems to be solved by the invention] The present invention has been made in view of the above-mentioned circumstances, and
An object of the invention is to provide a headrest device for a vehicle that can ensure sufficient strength of a mechanism for holding the headrest and is advantageous for supporting the head of an occupant.

Furthermore, a second object of the invention is to provide a headrest device for a vehicle that automatically tilts and raises the headrest in accordance with when an occupant sits down or leaves the seat.

[Means for Solving the Problems] A headrest device for a vehicle according to a first aspect of the present invention includes a base portion held at the upper end of the seat, and a rotating shaft held at the base portion so as to be freely rotatable in a substantially horizontal direction. A moving shaft, and a headrest 1 to which is held by the rotating shaft and receives the head of the occupant.
and a drive device that is provided on the base portion and rotates the rotation shaft in the circumferential direction of the base portion by a predetermined angle, and the drive device rotates the rotation shaft by the drive III device to move the headrest to the seat. It is characterized by being able to fall down and stand up.

The headrest device for a vehicle according to the second invention includes, in addition to the above-mentioned configuration, a seating sensor that detects seating at the east exit to sea I and seat m; The present invention is characterized in that it has a control device 1111 that outputs a drive signal or a drive stop signal to the drive device.

The characteristics of the headrest device for a vehicle according to the present invention are that the headrest is held by a rotating shaft, and the rotating shaft is rotated by the driving vj device to make the headrest stand up with respect to the seat.
The point is that I caused it to fall over.

As the drive device, a link mechanism that changes linear motion to rotational motion can be used. In this case, the point of action of the link mechanism and the rotation shaft may be connected, and the rotation shaft may be rotated by the rotational movement of the point of action of the link mechanism, thereby turning the headrest upside down. Further, the drive H position can be composed of a pinion member provided on the rotating shaft and a rack member that meshes with the pinion member. In this case, the rack member is linearly moved to rotate the binion member and thus the rotation shaft, thereby inverting the headrest.

At least one rotation wheel is provided on the lateral end surface of the headrest.
It can be extended from either direction. In this case, the rotation shaft preferably extends from both ends of the headrest in the lateral direction, in order to ensure the strength of the headrest.

Further, in the vehicle headrest device according to the second invention,
A seating sensor that detects whether an occupant is seated on or leaves the seat, and a control device that receives a signal from the seating sensor and outputs a drive signal or a drive stop signal to the drive VtH in accordance with the signal are exposed to acid 9. There is. With this shift, the headrest can be automatically turned over or raised up by driving the drive device in response to the occupant sitting on or leaving the seat. Here, as the seating sensor, it is possible to use a switch that is built into the seat and turns on when the passenger's lower back hits it, or a switch that is attached to the seat belt and turns on when the seat belt is fastened. The control device includes an input interface that receives a signal from the seating sensor;
It can be formed from PU, RAM, ROM1 output interface.

It is also preferable to have a manual switch for manually switching the drive device on or off. In this case, the control device may be configured to give priority to the signal from the manual switch over the signal from the seating sensor and output a drive signal or drive stop signal for the drive device in response to the signal from the manual switch. preferable. This manual switch is preferably provided near the driver's seat or the passenger seat.

[Operation] When using the headrest device according to the present invention, the drive device is driven to rotate the rotating shaft in the normal direction. Then, the headrest, which is integrally held by the rotation shaft, rises as the rotation shaft rotates in the normal direction.

On the other hand, when the headrest position VT is not in use, the rotation wheel is reversely driven by the drive device. Then, the headrest, which is integrally held on the rotation shaft, rotates in the opposite direction, thereby allowing the headrest to fall over and lie down.

Further, according to the headrest device d for a vehicle according to the second invention, a signal corresponding to the occupant leaving or sitting on the seat is input to the illIOM device, and the driver is activated accordingly. The II device is driven.

[Effects of the Invention] According to the headrest Ill according to the first invention, the driving device rotates the rotary wheel to cause the headrest to fall over and stand up relative to the seat 1- so as to sag. Therefore, unlike the headrest device disclosed in Japanese Patent Application Laid-Open No. 60-71343, since an arm for supporting the headrest is not used, this is advantageous in securing strength for holding the headrest.

According to the vehicle headrest device according to the second invention,
The headrest can be automatically tilted down and raised up as the occupant sits down or leaves the seat.

[Example] An example of a headrest device according to the present invention is shown in FIGS. 1 to 6. Here, in FIG. 4, reference numeral 5 indicates a rear seat with a seat cushion 50 and a seat back 51.

As shown in FIG. 1, the headrest device according to this embodiment includes a base portion 1, a rotation @2, a headrest 3, and a drive'! It consists of a device 4.

In FIG. 1, the base portion 1 is held at the upper end portion of a seat frame 51a of a seat back 51. As shown in FIG. The base part 1 includes left and right brackets 10 and 11, and a bracket 1.
It consists of a connecting part 12 that connects 0 and 11.

The rotation shaft 2 is disposed substantially horizontally between the brackets 10 and 11 of the base portion 1. The rotation shaft 2 is a shaft portion 20 rotatably held in a hole of the bracket 10.
and a shaft portion 2 rotatably held in the hole of the bracket 11.
Consists of 1.

The headrest 3 supports the head of the occupant. Here, the shaft portions 20 iB and 21 of the rotation shaft 2 are integrally fixed to the lateral end surfaces of the headrest 3 and protrude from each lateral end surface 3 a of the headrest 3 .

The drive device 4 is provided on the base portion 1 and is embedded inside the seat back 51. The drive device 4 is for rotating the shaft portion 21 of the rotating shaft 2 in the normal or reverse direction in the circumferential direction thereof, and in this embodiment, it is held by a mounting plate 13 fixed to the bracket 11 with bolts 11a. and an output shaft 40 of the motor 40 as shown in FIG.
a, a first link 43 held in a non-rotating state, a second link 44 connected to the first link 43 via a pin 44a, and a rotation shaft connected to the second link 44 via a pin 44b. A third link 45 held in a non-rotating state by the end 21a of the shaft portion 21 of No. 2, a removal detection sensor 41 with the switch portion 41a, a storage detection sensor 42 having the switch portion 42a, and a second link 44. The stopper 46 is abutted against the side portion 44c of the stopper 46 to restrict the amount of swing of the second link 44. Here, the removal detection sensor 41 is formed of a limit switch, and when the headrest 3 is raised, the side portion 44c of the second link 44 hits the switch portion 4.
1a is activated. Therefore, the removal detection sensor 41 detects the upright state of the headrest 3 (indicated by a dashed line in FIG. 3), that is, the removal of the headrest 3. The storage detection sensor 42 is formed of a limit switch, and when the headrest 3 falls, the side portion 43 of the first link 43
When c hits, the switch section 42a is activated. Therefore, the stowage detection sensor 42 detects the overturned state of the headrest 3, that is, the stowed state (shown by a solid line in FIG. 3).

In this embodiment, as shown in FIG.
A seating sensor 6 built into the seat cushion 5o,
It has a take-out switch 7 as a manual switch provided on the side of an automobile door 70, and a storage switch 8 as a manual switch. The seating sensor 6 detects when an occupant sits on and leaves the rear seat 5. The take-out switch 7 manually operates the drive device 4 to remove the headrest 3.
The storage switch 8 drives the drive device 4 to store the headrest 3.

Next is Kakeru 1! The operation of the ll device 4 will be explained. First, taking out the headrest 3 will be explained. When the headrest 3 is erected and taken out, the motor 40 is rotated in the normal direction. When the motor 40 rotates forward in this manner, the output shaft 40a of the motor 40 rotates forward in the direction of the arrow shown in FIG. 3, and the first link 43 rotates in the direction of arrow B around the output shaft 40a. , the rotation of the first link 43 moves the second link 44 in the direction of arrow C as shown by the dashed line in FIG. 3, and rotates the third link 45 as shown by the dashed dotted line in FIG. As a result, the third link 45 rotates and the end 21a of the shaft portion 21 of rotation @2 rotates at the same time as the rotation of the third link 45, and at the same time the headrest 3 rotates in the direction of the arrow, that is, the headrest 3 stands up and is taken out from the storage position. be done. When the headrest 3 is removed from the storage position in this way, the second link 44 turns on the removal detection sensor 41. The headrest 3 is then held fixed at the removed position.

Next, storage of the headrest 3 will be explained.

In this case, the motor 4o is reversed. Drive motor 40
As a result of the reversal, the first link 43 rotates, and the first link 4
3, the second link 44 moves downward to the position shown by the solid line in FIG. 3, and the third link 45 is rotated to the position shown by the solid line. As the third link 45 rotates, the shaft portion 21 of the rotating shaft 2 rotates in the opposite direction, and at the same time, the headrest 3 is overturned and stored as shown by the solid line in FIG. Here, when the first link 43 moves and the storage detection sensor 42 is turned on,
The motor 40 stops, and the headless headrest (3) remains in the retracted position.

Figure 6 shows the headrest device of this embodiment.
This is a block diagram. Here control 21 If
i location 9 is an input interface 90. It has a CPU 91 and an output interface 92. As shown in FIG. 6, a seating sensor 6, a manual take-out switch 7, a manual storage switch 8, a take-out position detection sensor 41, and a storage position detection sensor 4
The second signal is input to the control device 9. The motor drive signal and motor drive stop signal from the m-control device 9 are output to a drive circuit 400 of the motor 40, and the motor drive circuit 400 roughly drives the motor 40.

Next, the effect of the headless +-i position according to this embodiment will be explained in the seventh section.
The explanation will be given according to the flowchart of the main parts processed by the CPU 91 shown in the figure. In step 100, the CPU 91 determines whether the seating sensor 6 is on or off, and when the seating sensor 6 is on, that is, the passenger is seated on the rear seat 5, the CPU 91 proceeds to step 101, and in step 101 determines the operating state of the eject switch 7. When the take-out switch 7 is on, the process proceeds to step 102, in which it is determined whether the take-out detection sensor 41 is on or off, and when the take-out detection sensor 41 is not on, the process proceeds to step 104, where a signal is sent to rotate the motor 40 in the forward direction. is output to the motor drive circuit 400. Therefore, the motor 40 rotates in the normal direction, thereby causing the rotating shaft 2 to rotate in the normal direction and the headrest 3 to be erected.

On the other hand, when the manual take-out switch 7 is off, the process goes from step 101 to step 105, and in step 105 it is determined whether the storage switch 8 is on or off. When the storage switch 8 is on, the storage detection sensor 42 is activated in step 106. It is determined whether the storage detection sensor 9 is on or off, and if the storage detection sensor 9 is not on, the process proceeds to step 108, and step 10
8 outputs a signal to reverse the motor 40. Therefore, the motor 40 reverses, the rotation shaft 2 reverses, and the headrest 3 falls and is stored in the storage section. That is, even if a passenger is seated in the rear seat 5, if the storage switch 8 is turned on,
The motor 40 is reversed, and the headless i~ is overturned and stored. In other words, the signal from the storage switch 8 is given priority over the signal from the seating sensor 6. Also, take out switch 7
and when the storage switch 8 is off, step 10
The process proceeds to step 9, and in step 109 it is determined whether the take-out detection sensor 41 is on or off.If the take-out detection sensor 41 is not on, the process proceeds to step 111, where a signal for normal rotation of the motor 40 is output. Therefore, the headrest 3 stands up as described above.

Further, when the seating sensor 6 is off in step 100, the process proceeds to step 112, in which the operation status of the eject switch 7 is determined in the same manner as described above, and the eject switch 7 is
is on, the process advances to step 113, and step 11
・Motor 4 except when the ejection detection pincer 41 is on in 3.
Outputs a8@ which rotates 0 forward. When the take-out switch 7 is off in step 112, the process proceeds to step 116, where it is determined whether the storage switch 8 is on or off, and when it is on, the process proceeds to step 117.
Step 11 when the storage detection sensor 42 is not on
9, and in step 119 a signal to reverse the motor 40 is output. Therefore, the rotation shaft 2 is reversed, and the headrest 3 is overturned and stored.

On the other hand, when both the takeout switch 7 and the storage switch 8 are off, the process advances to step 120, and when the storage detection sensor 42 is not on in step 120 (step 1
22, a signal for rotating the motor 40 in reverse is output.

In addition, steps 103.107.110, 114.11
At 8.121, a motor stop signal is output from CP (J91) to the motor drive circuit 400.

In the headrest device according to the present embodiment, the driving/vjing device 4 is built into the seat back 51 of the seat 5;
The R structure that holds headrests 1 to 3 is not exposed from the outside,
Therefore, the appearance can be improved. Further, in this embodiment, the headrest 3 is caused to fall or stand up with respect to the seat 5 by rotating the shaft portion 21 of rotation a@2 in the normal or reverse direction by rotating the motor 40 of the drive old I in the normal or reverse direction. It is configured to do this. For this reason, the special public interest
With the head device according to the February publication, there is no need to swing the arm and overturn the headrest.

Therefore, unlike conventional headrest devices in which the strength of holding the headrest tends to weaken by the length of the arm, sufficient strength of holding the headrest 3 can be ensured.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which FIG. 1 is a front view of the headrest device, FIG. 2 is a side view of the headrest device shown in FIG. 1 as seen from the motor side, and FIG. FIG. 4 is a schematic perspective view of the rear seat of an automobile, FIG. 5 is a side view of the removal detection sensor, and FIG. This is a block diagram of a control device for controlling such a headrest device, and FIG. 7 is a flowchart of operations carried out in the headrest device according to this embodiment. In the figure, 1 is a base part, 2 is a rotating shaft, 20 Get @ part, 21 is a shaft part, 3 is a headrest, 4 is a fitting device, 40
is the motor, 40a is the output shaft, 41 is the extraction detection hinge, 4
2 is a storage detection sensor, 43 is a first link, 44 is a second link, 45 is a third link, 5 is a seat, 6 is a seating sensor, 7 is a manual take-out switch, 8 is a manual storage switch,
Reference numeral 9 indicates a control device. Patent applicant Nippondenso Co., Ltd. Agent Patent attorney Hirodo Okawa Patent attorney Yoo Maruyama Figure 1

Claims (4)

[Claims] (1) A base portion held at the upper end of the seat, a rotating shaft held by the base portion so as to be freely rotatable in a substantially horizontal direction, and a headrest held by the rotating shaft to receive the head of the occupant. , a drive device that is provided on the base portion and rotates the rotation shaft in the circumferential direction of the base portion by a predetermined angle, and the drive device rotates the rotation shaft to move the headrest relative to the seat. A headrest device for a vehicle, characterized in that it is capable of falling over and standing up. (2) The headrest device for a vehicle according to claim 1, wherein the rotation axis extends from at least one of the end faces in the lateral direction of the headrest. (3) a base portion held at the upper end of the seat; a rotating shaft held by the base portion so as to be freely rotatable in a substantially horizontal direction; and a headrest held by the rotating shaft to receive the head of the occupant. , a drive device that is provided on the base portion and rotates the rotation shaft in a circumferential direction thereof by a predetermined angle; a seating sensor that detects whether an occupant is seated on or leaves the seat; A headrest device for a vehicle, comprising a control device that outputs a drive signal or a drive stop signal to a drive device in response to the signal. (4) The control device has a manual switch that manually switches the drive device to drive or stop, gives priority to the signal from the manual switch over the signal from the seating sensor, and controls the drive device according to the signal from the manual switch. The headrest device for a vehicle according to claim 3, which outputs a drive signal or a drive stop signal.