JPS6325153A - Head rest of car - Google Patents

Abstract

PURPOSE:To secure good sights sideways and backward by allowing two head rests to make takeout and accommodation operations through simultaneous slide along the sides of a seat back, and by controlling the head rests using a link mechanism driven by a motor. CONSTITUTION:When a driver wants takeout or accommodation of head rests 4a, 4b, a signal is sent to a control circuit 10 through input operation on a seat switch 5a, followed by calculation on the basis of given signal, and signal is passed to a motor drive circuit 11. The motor drive circuit 11 fed with signal puts a drive motor 12 in operation according to the given signal, and the head rests 4a, 4b are operated along the seat hack 2 by the use of a link mechanism. Thus the head rests 4a, 4b are slided along the seat back 2, and elevated and sunk while the distance between a head rest stay and a stay guide is held constant without exposure of head rest stay, which provides securing good sights sideways and backward.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a headrest for an automobile that is attached to an automobile seat, particularly a front seat.

[Conventional technology and problems]

A headrest protrudes from the top of the car seat.

The headrests are in a high position even though no occupants are seated in the vehicle, obstructing side and rear visibility, which may impede safe driving, especially when reversing, and also significantly obstructing the forward visibility of rear occupants. Ta.

To solve this problem, there is a method of manually moving the headrest as disclosed in Japanese Patent Application Publication No. 59-14529, etc.
A method has been proposed, such as No. 35239, in which the headrest is automatically raised and lowered in response to the occupant taking a seat or leaving the seat. However, when these types of seats are not in use, the headrest protrudes from the seat back and becomes a nuisance. Additionally, when the headrest is in use, the stays of the headrest are exposed to the outside by the amount that the headrest is raised, and the distance between the headrest and the stay guide becomes longer, which weakens the strength of the headrest stays when in use.As a result, the supporting effect of the headrest decreases. Not only was it not possible to get sufficient results, but it was also troublesome as one had to leave the seat or operate a switch to lower the headrest when backing up.

[Problem that the invention seeks to solve]

The present invention enables the headrest to be raised and lowered without exposing the headrest stay (while keeping the distance between the headrest stay and the stay guide constant) by sliding the headrest along the seat back in conjunction with the seat switch or shift lever. The purpose of this is to ensure side and rear visibility.

[Configuration and operation]

In order to achieve the above object, in the present invention, two headrests can be slid simultaneously along the sides of the seat back to take out and store them, and the headrest has a structure in which the link mechanism is controlled by a motor. is controlled by a control circuit that receives signals from sensors, etc. and outputs signals for forward rotation, reverse rotation, and stop.

〔Example〕

The structure of the actuator is shown in FIGS. 1 to 4.

The base 13 is arranged in the sheet bank 2 of the seat 1, and the base 13 has two slider holders 14.
A, 14b and a bracket 20 holding a drive motor 12 for moving the two headrests 4a, 4b are fixed. Further, a shaft 21 that swingably fixes arms 18a and 18b connecting the drive motor 2 and the headrests 4a and 4b is also fixed to the base 13.

The base 13 further includes a groove 1 that guides the movement of the link 16.
3a. The base 13 is fixed and housed within the seat bank 2.

The aforementioned slider holders 14a, 14b are attached to hendrest stays 22a, 22 that fix the headrests 4a, 4b.
b and an arm 19a connected to the links 18a, 18b;
Sliders 23a and 2 rotatably fix 19b.
3b is fixed. Furthermore, this slider 23a
, 23b, and two slider shafts 24a, 24b that slidably guide the headrest 4a<slider 23.
Two position sensors 8 and 9 for detecting the removal and storage positions of a) are also fixed to the slider holders 14a and 14b.

Further, a link 16 is provided on the output shaft 12a of the drive motor 12.
An arm 15 that transmits rotation to is fixed. Also,
One end of the link 16 is rotatably fixed by the arm 15 and the pin 150, and the other end is rotatably fixed by the links 17a, 17b and the shaft 25, respectively. and links 18a, 18
b is rotatably fixed to the shaft 21 and has one end connected to the link 1.
7a.

17b and pins 180a and 180b, the other end is arm 1
They are rotatably fixed by pins 9a, 19b and pins 190a, 190b, respectively. Therefore, the drive motor 12 and the headrests 4a, 4b are connected to the arm 15, link 16, link 17a, 17b, link 18a, 18b, arm 19a.
, 19b, slider 23a, 23bs head rest stay 22a.

22b.

FIG. 5 is a control block diagram for controlling the drive motor, and signals from various sensors are input to the control circuit 10. As shown in FIG. As this sensor, there is a seat switch 5a that detects whether the occupant is seated or leaves the seat and sends a signal to the control circuit 10, and this switch 5a is arranged at the seating portion of the seat cushion 3 as shown in FIG. . In addition, if the occupant uses the headrest 4a,
6. Manual switch that sends a signal to the control circuit 10 by switch input operation when it is necessary to take out or store 4b.
7, and position detection sensors 8 and 9 that detect the completion of removal and storage of the headrest 4a and send a signal to the control circuit 10. The control circuit 10 receives signals from the seat switch 5a, the manual switch 6.7, and the position detection sensors 8, 9, performs arithmetic processing, and then sends the signals to the motor drive circuit 11. The motor drive circuit that receives the signal from the control circuit 10 drives the drive motor 12 in accordance with the signal to operate the headrests 4a, 4b.

The control circuit 10 uses a microcomputer, and the flowchart of the headrest control program in this circuit 10 is as shown in FIG.

Next, this operation will be explained using the flowchart shown in FIG. The control circuit 10 determines whether the occupant is seated based on the on/off signal of the seat switch 5a (step 100).
When the seat switch 5a is on, the process moves to step 101. In step 101, the manual switch for taking out 6 is determined, and in step 102, the manual switch for storage 7 is determined. When the manual take-out switch 6 is on, the process moves to step 103 for determining whether the take-out position detection sensor 8 is on or off, and unless the sensor 8 is on, the drive motor 12 is rotated in the normal direction. From step 102, the process moves to step 104 for determining whether the storage manual switch 7 is on or off, and when the switch 7 is on, the drive motor 12 is reversed unless the storage position detection sensor 9 is on. Further, when the manual take-out switch 6 and the manual switch for storage 7 are off, the process moves to step 105 to determine whether the take-out position detection sensor 8 is on or off, and unless the sensor 8 is on, the drive motor 12 is rotated in the normal direction.

Further, when the seat switch 5a is off, the manual switch 6.7 is determined in steps 106 and 107 as described above. When the manual take-out switch 6 is on, the process moves to step 108 for determining whether the take-out position detection sensor 8 is on or off, and the drive motor 12 is rotated in the normal direction unless the sensor 8 is on. When the manual take-out switch 6 is off, the process moves to step 109 for determining whether the manual storage switch 7 is on or off, and when the switch 7 is on, the storage position detection sensor 9 determines whether the sensor 9 is off at step 109. When this happens, the drive motor 12 is reversed. Further, when the manual take-out switch 6 and the manual storage switch 7 are off, the process moves to step 110 for determining the storage position detection sensor 9, and unless the sensor 9 is on, the drive motor 12 is reversed.

Next, the operation of the actuator having the above configuration will be explained. First, to take out the headrests 4a and 4b, the drive motor 12 is rotated in the normal direction when the take-out position detection sensor 8 is not on based on a signal from the seat switch 5a or the manual take-out switch 6. As the drive motor 12 rotates, the arm 15 rotates, and further the arm 1
The rotation of 5 is transmitted to the second links 17a, 17b via the first link 16 and the shaft 25, and the second links 17a, 17 are guided by the groove 13a formed in the base 13.
Move b downward at the same time. This second link 17a
, 17b, the third links 18a, 18b rotate about the shaft 21 in the direction M in FIG. 1, and the upper ends of the third links 18a, 18b are pushed upward. As a result, the slider 23a,
23b is guided by slider shafts 24a and 24b and pushed upward. Slider 23a.

When 23b moves to the position of the take-out position sensor 8, the drive motor 12 stops. With the above operation, the sliders 23a and 23b are moved through the headrest stays 22a and 22b.
The headrests 4a and 4b fixed to the headrests 4a and 4b are simultaneously taken out upwards, resulting in the state shown by the broken line in FIG.

Next, storage of the headrests 4a and 4b will be explained.

In response to a signal from the seat switch 5a or the storage manual switch 7, the drive motor 12 is reversed when the storage position detection sensor 9 is not on. Due to the rotation of the drive motor 12, the arm 15 rotates in the opposite direction to the above case, and due to the rotation of the arm 150, the first link 16 pushes up the shaft 25 along the groove 13a of the base 13, and the second link 17
a and 17b also move upward at the same time. Due to the upward movement of the second links 17a and 17b, the third link 18
a and 18b rotate in the direction in FIG. 1 centering around the shirt 21, and the upper ends of the third links 18a and 18b are pulled down. Slider 2 via arms 19a and 19b
3a and 23b are guided by slider shafts 24a and 24b, and when they are pulled down and moved to the position of storage position sensor 9, drive motor 12 is stopped. With the above operation, the slider 2 is moved through the headrest stays 22a and 22b.
Headrests 4a, 4 fixed to 3a, '23b
b is stored downward at the same time.

FIG. 7 is a control block diagram of the second embodiment.

In this second embodiment, instead of the seat switch 5a of the first embodiment shown in FIG. 5, a shift lever switch 5b is used which sends a signal to the control circuit 10 in conjunction with the shift lever.

Next, the operation of the second embodiment having the above configuration will be explained in the eighth section.
This will be explained using the flowchart shown in the figure.

The control circuit 10 determines whether the shift lever is in the reverse position or another position in step 200. When the shift lever switch 5b is in the reverse position, the control circuit 10 then determines whether the manual take-out switch 6 and the manual storage switch 7 are in the reverse position. This is done in steps 201 and 202. When the manual take-out switch 6 is on, the drive motor 12 is rotated normally except when the take-out position detection sensor 8 is on (step 2o3). Further, when the storage manual switch 7 is on, the drive motor 12 is reversed unless the storage position detection sensor 9 is on (step 204). Also,
When the manual take-out switch 6 and the manual storage switch 7 are off, the drive motor 12 is reversed except when the storage position detection sensor 9 is on (step 205).

Further, when the shift lever switch 5b is in a position other than the reverse position, the manual switch 6.7 is determined as described above (steps 206 and 207). When the manual take-out switch 6 is on, the drive motor 12 is rotated in the normal direction unless the take-out position detection sensor 8 is on (step 208). Furthermore, when the storage manual switch 7 is on, the storage position detection sensor 9 is not on (step 209).
causes the drive motor 12 to reverse direction. In addition, when the manual take-out switch 6 and the manual storage switch 7 are off,
When the take-out position detection sensor 8 is not on (step 210
) rotates the drive motor 12 in the normal direction.

Headrest 4a due to forward/reverse rotation of drive motor 12,
The displacement of 4b is as described above.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an example of the link mechanism of the headrest of the present invention, Fig. 2 is a front view showing a part of the link mechanism shown in Fig. 1, and Fig. 3 shows other parts of the link mechanism shown in Fig. 1. 4 is a perspective view showing a vehicle seat equipped with the link mechanism shown in FIG. 1, FIG. 5 is a configuration diagram showing a first embodiment of the control circuit of the mechanism shown in FIG. 1, and FIG. Fig. 5 is a flowchart showing a control method of the control circuit shown in the drawing, Fig. 7 is a block diagram showing a second embodiment of the control circuit of the mechanism shown in Fig. 1, and Fig. 8 is a flowchart showing a control method of the control circuit shown in Fig. 7. It is. 1... Seat, 2... Seat back, 4a, 4b.
・・Headrest, 5a・・Seat switch, 10・
...Control circuit, 11...Motor drive circuit, 12...
Drive motor, 16, 17, 18...link. Representative Patent Attorney Takashi Okabe Figure 1] 4 Figure 2 Figure 3 Ward 4 5 Figure 7

Claims (4)

[Claims] (1) a slider shaft disposed obliquely on the upper side of the seatback of a vehicle seat; a slider shaft disposed slidably on the slider shaft and integrated with the seatback when displaced downward; a headrest that protrudes upward from the seat back when displaced upward; a motor that rotates in response to a signal from a motor drive circuit; a link mechanism that slides and displaces the headrest in response to rotation of the motor; and displacement of the headrest. , a switch that outputs a signal according to the required displacement of the headrest, and a control circuit that outputs a calculation result according to the signal from the switch and the displacement sensor to the motor drive circuit. headrest. (2) The headrest for a vehicle according to claim 1, wherein the switch is a seat switch that outputs a signal depending on whether the occupant is seated or leaves the seat. (3) The headrest for a vehicle according to claim 1, wherein the switch is a manual switch that outputs a signal in response to an operation by an occupant to put in or take out the headrest. (4) The headrest for a vehicle according to claim 1, wherein the switch is a shift lever switch that outputs a signal in conjunction with a shift lever of the automobile.