JPH0720896U - Vehicle headrest device - Google Patents

Abstract

(57) [Summary] [Purpose] The distance between the seated person's head and the headrest body,
A predetermined amount is secured during normal traveling of the vehicle, and when a following vehicle abnormally approaches the vehicle, the interval is eliminated or reduced to protect the seated person. [Structure] A headrest device includes a support shaft 11 rotatably supported on an upper portion of a back frame of a seatback and extending in the left-right direction, a headrest main body 12a assembled to the top of a stay fixed to the support shaft 11, and a back. Drive means 1 attached to the frame for rotating the support shaft 11 in the front-rear direction
3, a detection means 16 provided at the rear part of the vehicle for detecting a vehicle abnormally close to the rear part, and a control means 14 for driving and controlling the drive means 13 based on a detection signal from the detection means 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle headrest device.

[0002]

[Prior art]

 As shown in the publication "Automotive Engineering Handbook, Vol. 6, pages 1-25 (published by Japan Society of Automotive Engineers, September 30, 1983)" as one type of vehicle headrest device, the front and rear direction of the headrest body It is known that the position of is adjustable. In the headrest device, the headrest body is normally located in a state in which the head of the occupant is separated from the head of the occupant by a certain amount so that the headrest does not hinder driving and does not cause discomfort due to contact with the head of the occupant. If necessary, the position is adjusted in the front-back direction by manual operation.

[0003]

[Problems to be solved by the device]

 By the way, in this type of headrest device, if there is a certain amount of clearance between the headrest body and the head, when the vehicle collides from behind, the head collides with the front side of the headrest body and the head And the neck may receive a big shock. Therefore, it is an object of the present invention to address such issues.

[0004]

[Means for Solving the Problems]

 The present invention relates to a vehicle headrest device, which is mounted on a support shaft that is rotatably supported on an upper portion of a back frame of a seat back and extends in the left-right direction, and on a top portion of a stay supported by the support shaft. A headrest main body, a drive unit that is assembled to the back frame and rotates the support shaft in the front-rear direction, a detection unit that is provided at a rear portion of the vehicle and that detects a vehicle that is abnormally approaching the rear portion, and a detection unit from the detection unit. And a control means for controlling the drive of the drive means on the basis of the detection signal.

[0005]

[Operation and effect of the device]

 In the headrest device having such a configuration, there is a predetermined amount of clearance between the seated person's head and the headrest body in normal times, and it is considered that the driver's seat does not hinder driving. In the case of other seats, consideration is given so that the seated person's head is not uncomfortable. Then, when the vehicle approaches (abnormally approaches) the rear portion of the vehicle within a predetermined range, the detection means detects this, and the control means drives and controls the drive means based on the detection signal from the detection means. Rotate the shaft a predetermined amount. For this reason, the headrest body rotates forward to contact the head of the seated person to support the head, and to deal with a collision from the rear of the headrest. Therefore, if the vehicle collides from the rear, the head does not collide with the front side of the headrest body and the head and the neck are not greatly impacted.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a headrest device according to the present invention. The headrest device 10 includes a support shaft 11, a headrest 12, a drive unit 13, and a control device 14, a drive circuit 15 and a sensor 16 shown in FIG.

The support shaft 11 has a predetermined length, and a pair of left and right insertion cylinders 11b are fixed to the shaft portion 11a, and a link 11c is fixed to one end of the shaft portion 11a. The support shaft 11 is rotatably supported on the top of the back frame 22 of the seat back 21 and extends in the left-right direction. The headrest 12 is provided with a stay extending downward from its main body 12a, and a pair of leg portions 12b of the stay is inserted into a headrest support 23 inserted into an insertion tube 11b of the support shaft 11, and is connected to the headrest support 23. It is fixed in the insertion tube 11b by the engagement of. Therefore, the headrest 12 can be moved in the vertical direction and its position can be adjusted by removing the legs 12b from the headrest support 23.

The drive means 13 is composed of a drive motor 13 a, a gear box 13 b and an output shaft 13 c. The motor 13 a and the gear box 13 b are arranged on the side portion of the back frame 22 and the output shaft 13 c is attached to the support shaft 11. 11d is engaged with and connected to the elongated hole 11d provided in the link 11c. As a result, when the motor 13a is driven, the rotation thereof is decelerated by the gear box 13b and transmitted to the output shaft 13c, and the output shaft 13c rotates in the front-rear direction by a predetermined amount to rotate the link 11c in the front-rear direction by a predetermined amount. . As a result, the shaft portion 11a of the support shaft 11 rotates in the front-rear direction by a predetermined amount, and the leg portion 12b of the headrest 12 inserted into the insertion tube 11b and the headrest body 12a integrated with the leg portion 12b rotate in the front-rear direction by a predetermined amount. .

As shown in FIG. 4, the control means includes a control device 14 and a drive circuit 15. The control device 14 receives a detection signal from a sensor 16, and the control device 14 controls the drive circuit 15 by the detection signal. The signal is output. The drive of the drive motor 13a is controlled by the operation of the drive circuit 15 based on the control signal. The sensor 16 detects when a following vehicle approaches the rear portion of the vehicle for a predetermined distance (abnormal approach), and a detection signal is input to the control device 14. The control device 14 outputs a drive signal for the motor 13a based on this detection signal to operate the drive circuit 15 to rotate the motor 13a by a predetermined amount. Further, when the distance from the following vehicle is separated by a predetermined distance or more and the input of the detection signal from the sensor 16 is stopped, the output of the control signal from the control device 14 to the drive circuit 15 is stopped after a predetermined time, and the motor 13a is located. Rotate a fixed amount in reverse.

In the vehicle headrest device 10 configured as described above, there is a predetermined amount of clearance between the head of the seated person and the headrest body 12a during normal operation, which may hinder driving in the driver's seat. It is designed so that there is no discomfort to the seated person's head in the case of other seats.

When the vehicle following the vehicle approaches a range of a predetermined distance, the sensor 16 detects this and the controller 14 operates the drive circuit 15 based on this detection signal to cause the support shaft 11 to move. Is rotated by a predetermined amount. As a result, the headrest main body 12a pivots forward by a predetermined amount and abuts against the head of the seated person to support the head, and the collision from the rear is dealt with as a possibility that the following vehicle may collide. . Further, when the distance from the following vehicle is separated by a predetermined amount or more, the control device 14 rotates the headrest body 12a rearward by a certain amount to restore the normal traveling state.

Therefore, even if the vehicle collides from the rear, the head will not collide strongly with the front side of the headrest body 12a and the head and neck will not be significantly impacted.

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional side view taken along line 2-2 of FIG. 1 when the headrest device is not in operation.

FIG. 3 is a vertical sectional side view corresponding to FIG. 2 when the headrest device is in operation.

FIG. 4 is a block diagram showing a control means constituting the headrest device.

[Explanation of symbols]

10 ... Headrest device, 11 ... Support shaft, 12 ... Headrest, 12a ... Headrest body, 13 ... Driving means,
14 ... Control device, 15 ... Drive circuit, 16 ... Sensor, 21
... Seat back, 22 ... Back frame.

Claims (1)

[Scope of utility model registration request] 1. A support shaft that is rotatably supported on an upper portion of a back frame of a seat back and extends in the left-right direction, a headrest body mounted on the top of a stay supported by the support shaft, and the back frame. Drive means for rotating the support shaft in the front-back direction, a detection means for detecting a vehicle abnormally approaching the rear portion of the vehicle, and the drive means based on a detection signal from the detection means. A headrest device for a vehicle, comprising: