JP2006224921A - Seat for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce complicated adjustment of a head rest when angle of a seat back is changed, and to properly hold the head of an occupant in response to angle of the seat back. <P>SOLUTION: The head rest 13 of a seat for a vehicle provided with a reclining mechanism is structured of an upper head rest part 131 supported by the seat back and a lower moving part 132 arranged to adjust movement quantity thereof in the back and forth direction in relation to the upper head rest part. At least movement quantity of the upper head rest part 131 in the height direction or movement quantity of the lower moving part 132 in the back and forth direction is adjusted in response to a change of angle of the seat back 12 by the reclining mechanism. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle seat, and more particularly, to a vehicle seat having a reclining mechanism and a headrest divided into upper and lower parts and individually adjustable.

  Conventionally, in a vehicle seat, it is necessary to adjust the height and angle of the headrest in order to properly support the head of the occupant.

  For this reason, there exists what comprised some headrests so that adjustment was possible independently (patent document 1). The configuration described in Patent Document 1 has a U-shape at the lower part of the headrest when viewed from the front, and a lower rotating part that rotates about an axis extending in the side part direction of the seat. By rotating so that both ends of the part are located in front, the lateral shaking of the head is suppressed.

On the other hand, there is also known one in which an attachable pillow is installed at the lower front portion of the headrest to support the occupant's neck (Patent Document 2). In the configuration described in Patent Document 2, a pillow separate from the seat is installed later.
Japanese Patent Laid-Open No. 9-075167 Registered Utility Model No. 3091897

  However, in the conventional vehicle seat, it is necessary to adjust the headrest when the angle of the seat back with respect to the vertical direction is changed by the reclining mechanism. When an attachable pillow is provided, the adjustment of the headrest becomes troublesome.

  That is, in the standing state where the angle of the seat back is nearly vertical (also referred to as an inverted state or standing state) and the rearward tilted state where the seat back is inclined backward (also referred to as a reclining state) Since the center and the center of rotation near the occupant's buttocks are different, the relative positional relationship between the occupant's head and the headrest is shifted, so the headrest needs to be adjusted to reduce this shift.

  Here, when a part of the headrest can be adjusted independently, or when a pillow separate from the seat is installed later, in these configurations, the headrest of the occupant Since the predetermined position of the cervical part just matches, it feels comfortable, so adjustment of the headrest is also necessary with the change of the angle of the seat back, and such adjustment becomes troublesome.

  For example, if the seatback angle is changed to the standing position after adjusting the headrest in the rearward tilted state, there are two adjustments: the height adjustment of the headrest and the angle of the lower rotation part and the adjustment position of the pillow. Adjustments need to be made.

  If such adjustment is not performed, the headrest cannot be held in an appropriate state by the headrest during acceleration or rear-end collision, and the passenger feels uncomfortable.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to reduce the troublesome adjustment of the headrest when the angle of the seat back is changed and the angle of the seat back. It is to hold the occupant's head appropriately.

In order to achieve the above object, a vehicle seat as one aspect of the present invention includes:
A seat back, a reclining mechanism that allows adjustment of the angle of the seat back with respect to the vertical direction, and a headrest installed around the upper end of the seat back;
The headrest is positioned above the headrest, and an upper headrest portion supported by the seatback and a lower side of the upper headrest portion can adjust the amount of movement in the front-rear direction with respect to the upper headrest portion. In the vehicle seat composed of the lower moving part disposed,
Corresponding to a change in the angle of the seat back by the reclining mechanism, adjustment means is provided for adjusting at least the movement amount in the height direction of the upper headrest part or the movement amount in the front-rear direction of the lower movement part. It is characterized by.

  According to this configuration, when the seat back angle is changed by the reclining mechanism, at least one of the movement amount in the height direction of the upper headrest part and the movement amount in the front-rear direction of the lower movement part is automatically adjusted. Therefore, the troublesome adjustment of the headrest when changing the angle of the seat back can be reduced, and the head of the occupant can be appropriately held according to the angle of the seat back.

  The adjusting means includes height adjusting means for moving at least the upper headrest portion upward in response to a change in the angle of the seat back to the vertical side.

  According to this configuration, when the angle of the seat back is changed to the vertical side, that is, when the angle is changed from the substantially horizontal state side to the standing state side, the upper headrest portion is moved upward. This makes it possible to reliably suppress the rearward displacement of the head during acceleration and the like.

  The height adjusting means suppresses at least the downward movement of the upper headrest portion in response to an angle change of the seat back to the horizontal side.

  According to this configuration, when the angle of the seat back is changed to the horizontal side, that is, when the angle is changed from the substantially vertical state side to the rearward tilt side, the passenger's hair is sandwiched between the lower end of the headrest and the upper end of the seat back. It is possible to prevent the passenger from feeling uncomfortable.

  The adjusting means includes forward / backward moving amount adjusting means for displacing the lower moving portion rearward or allowing rearward displacement in response to an angle change of the seat back to the vertical side. To do.

  According to this configuration, when the angle of the seat back is changed to the vertical side, that is, when the angle of the seat back is changed to the standing state side, the lower moving unit is displaced or allowed to the rear side. The head can be held in an appropriate posture by preventing the occupant's neck from being compressed.

  The lower moving unit is configured such that the amount of movement in the front-rear direction can be adjusted by a pressing force toward the rear side that is greater than or equal to a predetermined value by the occupant's head.

  According to this configuration, since the occupant can adjust the amount of forward and backward movement of the lower moving part without directly adjusting by hand, the troublesome adjustment is further reduced.

Moreover, the vehicle seat as another aspect of the present invention is:
A seat back, a reclining mechanism that allows adjustment of the angle of the seat back with respect to the vertical direction, and a headrest installed around the upper end of the seat back;
The headrest is positioned above the headrest, and an upper headrest portion supported by the seatback and a lower side of the upper headrest portion can adjust the amount of movement in the front-rear direction with respect to the upper headrest portion. In the vehicle seat composed of the lower moving part disposed,
In accordance with a predetermined adjustment of the amount of movement of the lower moving part in the front-rear direction, adjustment means for adjusting the amount of movement of the upper headrest part in the height direction is provided.

  According to this configuration, since the amount of movement of the upper headrest portion in the height direction can be adjusted simply by adjusting the amount of movement of the lower moving portion in the front-rear direction, the troublesome adjustment of the headrest when changing the angle of the seat back, etc. The head of the occupant can be appropriately held according to the angle of the seat back.

  According to the present invention, troublesome adjustment of the headrest when the angle of the seat back is changed is reduced, and the head of the occupant can be appropriately held according to the angle of the seat back.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the constituent elements described in this embodiment are merely examples, and are not intended to limit the scope of the present invention only to them.

<First Embodiment>
(In-car layout)
FIG. 7 is a schematic view schematically showing a layout in a vehicle to which a vehicle seat according to the present invention is attached.

  In FIG. 7, two rows of front seats 10 and rear seats 20 are mounted in a cabin 8 partitioned by a floor panel 1, a windshield 2, a roof panel 3 and a rear partition 4.

  There are two front seats, one for the driver's seat and one for the passenger's seat. The front and rear positions are adjusted (sliding) in the horizontal direction with respect to the steering 6 attached to the engine room 5 and the steering shaft 7, and the vertical direction with respect to the floor panel 1. It is attached to the floor panel 1 so that the position can be adjusted, and includes a seat cushion 11 serving as a seating surface, a seat back 12 functioning as a backrest, and a headrest 13 installed at an upper end portion of the seat back. The two front seats 10 can independently adjust the angle of the seat back 12 with respect to the vertical direction.

  Similarly to the front seat, the rear seat 20 includes a seat cushion 21 that serves as a seating surface, a seat back 22 that functions as a backrest, and a headrest 23 that is installed at the upper end of the seat back. Has one long surface as a whole, and is mounted so that adjustment of the horizontal position and the vertical position is impossible. The rear seat 20 is divided so that the angle with respect to the vertical direction of the seat back 22 can be adjusted independently when two people are seated, and the headrest 23 also corresponds to the two divided portions. One is provided.

  It should be noted that, depending on the vehicle specifications and the like, it is a matter of course that two independent seats similar to the front seat may be used instead of a single surface having two parts that can be divided.

  In the following description, the vehicle seat attached to the passenger seat of the front seat will be described in detail as an example of the vehicle seat according to the present invention. However, the vehicle seat according to the present invention is in accordance with the desired specifications and the like. It may be attached to the rear seat. However, the vehicle seat according to the present invention is intended to hold the occupant's head in a comfortable posture when the vehicle is tilted backward (reclining), so it is preferable to attach the vehicle seat to a position other than the driver's seat.

(Recliner mechanism)
FIG. 8 is a partially enlarged view for explaining the reclining mechanism of the vehicle seat according to the present invention.

  In FIG. 8, a cushion support plate 115 fixed to the seat cushion and a rotation plate 117 connected to the lower end of the back support plate 116 fixed to the seat back are rotatably connected by a rotation shaft 170. Yes. The rotating plate 117 is formed with a gear portion 171 having a predetermined length on the outer periphery of the lower portion, an engaging portion 172 is provided at a predetermined position, and a spring for biasing the rotating plate 117 counterclockwise to the mating portion 172. One end of the spring 118 is engaged, and the other end of the spring 118 is engaged with a support bracket 181 fixed to the cushion support plate 115. The other end of the lock plate 119 having one end of the gear portion 191 that meshes with the gear portion 171 of the rotation plate 117 is pivotally supported by the cushion support plate 115 by a pin 190, and is opposite to the gear portion 191 of the lock plate 119. An engaging portion 192 is formed on the inner surface.

  The operating lever 104 is pivotally supported by the cushion support plate 115 with a pin 140 at the base, and an engaging portion 143 to which one end of a spring 120 that urges the operating lever clockwise in the figure is engaged, And an engaging portion 142 that contacts the engaging portion 192 of the lock plate 119. When the operation bay 104 is rotated in the clockwise direction in the drawing, the engagement between the engagement portion 142 of the operation lever 104 and the engagement portion 192 of the lock plate 119 is released, and the rotation plate 117 can be rotated. Become. In this state, if the seat back is applied with a weight to the rear, which is the right side in the figure, the seat back is tilted (reclined). If no load is applied to the seat back, the seat 118 returns to the standing state by the force of the spring 118.

(Summary of adjustment)
The adjustment of the headrest corresponding to the change in the angle of the seat back in the vehicle seat of the present embodiment having the reclining mechanism as described above will be described in detail.

  FIG. 1 is a view showing a rearward tilted state (a reclining state or a laid state) in which the angle of the seat back of the vehicle seat according to the present embodiment is changed to the horizontal side, and FIG. 2 shows the seat from the state of FIG. It is a figure which shows the standing state (inverted state or the state which raised) which changed the angle | corner of the back | bag to the vertical side.

  In FIG. 1, a vehicle seat 10 includes a seat cushion 11, a seat back 12, and a headrest 13, and a three-point seat belt that regulates the amount of movement of the occupant 20 with respect to the vehicle seat 10 at the lower abdomen and the chest. 14 is provided. The seat cushion 11 is fixed to a seat slide upper portion 111, and the seat slide upper portion 111 is coupled to a seat slide lower portion 112 so as to be slidable in the front-rear direction. The seat slide lower portion 112 is formed by a seat mount front portion 113 and a seat mount rear portion 114. Connected to the floor panel. Further, the vehicle seat 10 of the present embodiment includes an encoder that outputs a signal corresponding to the rotation angle (change) of the rotation shaft (hinge) 170 of the seat back 12 in order to detect the angle of the seat back 12. A sensor 175 including this is incorporated.

  The headrest 13 is installed around the upper end of the seatback 12 and functions as an upper headrest portion supported by the seatback by a support bar. The headrest 13 is positioned below the headrest body 131 and is located below the headrest body 131. Thus, the necklace 132 is composed of two parts that function as a lower moving part that can be adjusted in the amount of movement in the front-rear direction. The necklace is located on both sides of the upper headrest in the seat width direction, and when the necklace is located on the lower side of the upper headrest, the upper part is pivotally supported on the horizontal axis along the seat width direction of the upper headrest. And two neck support portions connected to the lower portions of the respective connection portions and extending along the seat width direction. In this embodiment, as will be described later, the necklace 132 is rotatably coupled to both sides of the headrest main body 131 and the upper portion of the headrest main body, and by adjusting the angle θ with respect to the headrest main body 131, The amount of direction movement can be adjusted.

  In the rearward tilt state shown in FIG. 1, the headrest body 131 is adjusted in the distance (height) from the seat back 12 to support the back of the occupant 20, and the neckrest 132 is the headrest body to support the occupant's neck. The amount of movement in the front-rear direction is adjusted by adjusting the angle θ with respect to 131. As shown in the drawing, when the headrest body 131 is adjusted to support the occupant's back head in a normal backward tilt state, the height of the headrest body 131 is lowered, and when adjusted to support the occupant's neck, the headrest body of the necklace 132 is adjusted. The amount of forward movement with respect to 131 increases (θ increases).

  Here, when the occupant changes the angle of the seat back 12 from the rearward inclined state shown in FIG. 1 to the standing state shown in FIG. Since the angle change fulcrum of the occupant 20 is shifted, it is necessary to adjust the height of the headrest body 131 and the amount of movement of the necklace 132 in the front-rear direction. As shown in FIG. 2, in order to properly support the occupant's back of the head in the standing state, the headrest body 131 is raised (moved upward) even in consideration of an increase in the amount of depression of the seat cushion 11. In order to reduce the burden on the occupant's head and neck at the time of a rear collision, etc., or to maintain the head and neck by a necklace in a comfortable state, In order to prevent the head and neck of the occupant from being subjected to different orientations and different loads from the upper body due to steps between the headrest body 131 and both sides of the necklace 132, the necklace 132 is attached to the headrest body 131. It is preferable to move it backward (decrease θ).

  As described above, in the configuration in which the headrest 13 is composed of the two parts of the headrest body 131 and the necklace 132, the height of the headrest body 131 is adjusted in accordance with the change in the angle of the seat back 12, and the necklace 132. Two adjustments, that is, adjustment of the amount of movement in the front-rear direction are required, which is troublesome. In this embodiment, in order to reduce the troublesome adjustment, the sensor 175 detects a change in the angle of the seat back, and adjusts the height of the headrest body 131 and the amount of movement of the necklace 132 in the front-rear direction. The adjustment means which performs these two adjustments automatically is provided.

  That is, the adjusting means of the present embodiment increases the height of the headrest body 131 and moves the necklace 132 rearward in response to the angle change from the rearward tilted state of FIG. 1 to the standing state of FIG. Let Further, the height of the headrest body 131 is lowered and the necklace 132 is moved forward in response to the change in angle from the standing state of FIG. 2 to the rearward tilted state of FIG. However, when the angle is changed from the standing state (FIG. 2) to the rearward tilted state (FIG. 1), the lower side of the headrest body 131 is arranged so that the headrest body 131 and the upper end of the seat back 12 do not contact each other. The distance h between the two is controlled to be a predetermined distance or more. This is to prevent, for example, the passenger's hair or clothing from being caught between the lower portion of the headrest body 131 and the upper end portion of the seat back 12.

  Note that the height of the headrest body 131 and the amount of movement of the necklace 132 in the front-rear direction can be adjusted manually. In particular, with regard to the amount of movement of the necklace in the front-rear direction (angle θ), for example, when the seat back is at least standing, the occupant is pushing a predetermined value (for example, 30 to 100 N horizontally in the vehicle front-rear direction). A mechanism using sliding resistance (friction) between the necklace 132 and the headrest 131 so that the amount of movement of the necklace 132 in the front-rear direction can be adjusted by pressing the necklace 132 with pressure, A friction mechanism may be provided at the pivotal support portion 132.

(Adjustment means)
FIG. 3 is a partial perspective view showing a configuration example of the adjusting means of the present embodiment. The headrest 13 is located at the center and the upper side when viewed from the front, and extends downward from both sides of the headrest body 131 when viewed from the front, with the headrest body 131 supported by the seatback 12 by two support bars 1315 and 1316. Necklace 132 that is U-shaped and penetrates the headrest body 131 and is pivotally coupled to both sides of the headrest body 131 by a pivot shaft 1314 fixed to the headrest body 131 by a shaft support portion 1313. It is configured. In the headrest main body 131, a motor 1311 for controlling the angle of the necklace 132 with respect to the headrest main body 131, a gear 1312 that engages with the rotation shaft of the motor 1311 and is coupled to the rotation shaft 1314 are provided. The motor 1311 is driven in response to a signal from a drive box 123 provided in the seat back 12.

  On the other hand, in the seat back 12, a seat back frame 121, a load receiving plate 122 that is connected to the seat back frame 121 by a rotating shaft sleeve 124, and rotates according to a pressing force (load) on the seat back of the occupant, a headrest A drive box 123 for adjusting the height of 13 is provided. A support bar sleeve 125 is attached to the rotary shaft sleeve 124 to hold two support bars attached to the headrest body 131 so that the height of the support bar can be adjusted in the vertical direction. The drive box 123 includes a motor 1231 for controlling the height of the headrest, a gear 1232 that engages with the rotation shaft of the motor 1231, an arithmetic device (not shown), and the like. The load receiving plate 122 may not be coupled to the seat back frame 121, and the rotation axis may be independent of the seat back frame 121.

  The operation of the adjusting means of the present embodiment will be described. When a signal from the sensor 175 for detecting the angle of the seat back 12 is input to the drive box 123, the arithmetic unit (not shown) calculates the seat back from the signal. The presence or absence of an angle change is determined. If there is an angle change, the direction and magnitude of the change angle are determined. Then, the arithmetic unit calculates the height of the headrest 13 and the amount of movement (angle) of the neckrest in the front-rear direction according to the direction and size of the change angle, and controls the motor 1231 and necklace to control the height of the headrest. A drive signal for the motor 1311 for controlling the forward / backward movement amount (angle θ) is output. In response to the drive signals for the two motors, the motors 1231 and 1311 are driven to adjust the height of the headrest and the amount of movement of the necklace in the front-rear direction.

  The motor 1231 that controls the height of the headrest body 131 and the motor 1311 that controls the angle of the necklace 132 are motors that can control the rotation angle in accordance with the number of pulses output from the arithmetic unit in the drive box 123. For example, a stepping motor or a servo motor is used.

(Control flow)
A flow of adjustment processing by the adjustment unit of the present embodiment will be described with reference to a flowchart of FIG.

  First, as the current data, the seat back angle, the headrest height, and the necklace angle based on the output of the sensor 175 are obtained (step S401). If the data is obtained when the electric circuit of the vehicle is activated and the values are stored in a memory (not shown) (such as a RAM) provided in the drive box, the adjustment process is activated. When this is done, the value stored in the memory may be read out.

  Next, it is determined whether or not the seat back angle has been changed by the operation of the passenger (step S402). This is done by monitoring the signal output of the sensor 175 that detects the seat back angle.

  When the change in the angle of the seat back is detected, it is determined whether or not the change is in the vertical direction (that is, the change in the angle toward the standing state) (step S403). When it is determined that the angle change is in the vertical direction, the arithmetic unit in the drive box 123 calculates the seat back angle based on the signal output of the sensor 175, and corresponds to the calculated seat back angle. The headrest height and necklace angle are calculated, and the respective motors are driven to adjust the headrest height and necklace angle (step S404).

  On the other hand, if it is determined in step S403 that the angle change is not in the vertical direction, that is, the angle change is in the horizontal direction, the seat back is based on the signal output of the sensor 175 by the arithmetic unit in the drive box 123. The headrest height and necklace angle corresponding to the calculated seat back angle are calculated, and the respective motors are driven to adjust the headrest height and necklace angle (steps). S405). In this case, if the calculated height of the headrest is less than the predetermined value, the calculation result is forcibly replaced with the predetermined value so that the distance between the lower portion of the headrest and the upper end of the seat back is not less than the predetermined value. To do.

  Here, detection of the angle change of the seat back and adjustment of the height of the headrest and the angle of the necklace may be performed substantially simultaneously, and there is a time lag, that is, a delay time or a time lag between the two. Also good. If this time lag is set appropriately, for example, the height of the headrest and the angle of the necklace can be prevented from being adjusted within an average time required for the occupant to determine the angle of the seat back.

  The headrest height and necklace angle corresponding to the seatback angle may be obtained by a predetermined calculation such as a linear expression, but the seatback angle, headrest height, and necklace angle The correspondence table may be prepared in advance, and each value may be obtained by referring to the table.

  Further, as described above, in the configuration in which the value obtained when the electric circuit of the vehicle is activated is stored in a memory (not shown) provided in the drive box, the value is adjusted after step S404 or S405. The value is preferably updated as current data.

  Furthermore, in this embodiment, the adjustment operation of the headrest height and the necklace angle (the amount of movement in the front-rear direction) is performed in response to both the angle change in the vertical direction and the angle change in the horizontal direction of the seat back. However, these adjustment operations are performed only in response to changes in the angle in the vertical direction, and a configuration in which the occupant manually handles the change in the angle in the horizontal direction, or simply the vertical direction of the headrest. It is good also as a structure which does not adjust (prohibit).

  In addition, in the above-described embodiment, the adjusting means includes an arithmetic device and a motor, and the height of the headrest and the angle of the necklace (the amount of movement in the front-rear direction) are determined by electrical means based on the seatback angle information output from the encoder. However, the present invention is not limited to this, and using a link mechanism or the like, at least the height of the headrest and the angle of the necklace (the amount of movement in the front-rear direction) corresponding to the angle change of the seat back One of them may be mechanically adjusted. Even in such a mechanical adjustment configuration, the timing of the change in the seatback angle and the accompanying adjustment operation may be substantially the same or may be shifted in time. .

  As described above, according to the present embodiment, when the seat back angle is changed by the reclining mechanism, both the height of the headrest body and the amount of movement of the necklace in the front-rear direction are automatically adjusted. The troublesome adjustment of the headrest when changing the angle of the seat back can be reduced, and the head of the occupant can be appropriately held according to the angle of the seat back. Furthermore, when the seat back is changed to the rearward tilted state, the distance between the lower portion of the headrest and the upper end of the seat back is suppressed so as not to be less than a predetermined value, thereby preventing the passenger's hair, clothing, etc. from being caught. can do.

<Second Embodiment>
Hereinafter, a second embodiment of the vehicle seat according to the present invention will be described. The second embodiment is also a vehicle seat similar to the first embodiment. In the following, the same reference numerals are given to the same parts as those in the first embodiment, and the description thereof is omitted. The explanation will focus on the characteristic parts.

  When the second embodiment is compared with the first embodiment, the operation of the adjusting means is different. In the first embodiment, the angle change of the seat back is detected, and the detected angle change is corresponded. Although the height of the headrest and the angle of the necklace are automatically adjusted, the second embodiment performs the adjustment operation performed when the occupant changes the angle of the seat back, Only the adjustment of the (direction movement amount) is required.

(Adjustment means)
FIG. 5 is a partial perspective view showing a configuration example of the adjusting means of the second embodiment of the vehicle seat according to the present invention in the same manner as FIG. The headrest 13 is positioned at the center and the upper side when viewed from the front, and the headrest main body 131 supported by the seatback 12 by one support bar 1315 and the Urest extending downward from both sides of the headrest main body 131 when viewed from the front. The necklace 132 is shaped like a letter and penetrates the headrest body 131 and is pivotally coupled to both sides of the headrest body 131 by a pivot shaft 1314 fixed to the headrest body 131 by a shaft support portion 1313. ing. An encoder 1317 that outputs angle information of the necklace 132 with respect to the headrest body 131 is provided in the headrest body 131, and an output signal from the encoder 1317 is transmitted to a drive box 123 provided in the seat back 12. The

  On the other hand, a seat box 12 and a drive box 123 for adjusting the height of the headrest 13 are provided in the seat back 12. The seatback frame 121 is provided with a support bar sleeve 125 that holds one support bar attached to the headrest body 131 so that the height in the vertical direction can be adjusted. The drive box 123 includes a motor 1231 for controlling the height of the headrest, a gear 1232 that engages with the rotation shaft of the motor 1231, an arithmetic device (not shown), and the like.

  The operation of the adjusting means of the present embodiment will be described. Based on a signal from the encoder 1317 that outputs angle information of the necklace 132, whether or not there is a change in the angle of the necklace 132 is determined by an arithmetic unit (CPU) (not shown). If there is a change, the direction and magnitude of the change angle is determined. Then, the arithmetic device calculates the amount of movement (distance) in the height direction of the headrest 13 according to the direction and size of the change angle, and outputs a drive signal to the motor 1231 for controlling the height of the headrest. In accordance with the drive signal for the motor, the motor 1231 is driven to adjust the amount of movement of the headrest in the height direction.

(Control flow)
A flow of adjustment processing by the adjustment unit of the present embodiment will be described with reference to a flowchart of FIG.

  First, as the current data, the angle of the necklace is obtained based on the output of the encoder 1317 (step S601). If this data is obtained when the electric circuit of the vehicle is activated, and the value is stored in a memory (not shown) (such as RAM) provided in the drive box, the adjustment process is activated. In such a case, the value stored in the memory may be read out.

  Next, it is determined whether or not the angle of the necklace has been changed by the operation of the occupant (step S602). This is performed by monitoring the signal output of the encoder 1317 that outputs the angle information of the necklace 132.

  When a change in the angle of the necklace 132 is detected, the computing device in the drive box 123 calculates the angle of the necklace 132 based on the signal output of the sensor encoder 1317, and the headrest of the headrest corresponding to the calculated angle of the necklace is calculated. The height is calculated, and the motor 1231 is driven to adjust the height of the headrest (step S603). When the calculated height of the headrest is less than a predetermined value, the calculation result is forcibly replaced with a predetermined value so that the distance between the lower portion of the headrest and the seat back upper end does not become less than the predetermined value.

  Here, the detection of the angle change of the necklace and the adjustment of the height of the headrest may be performed substantially simultaneously, or there may be a time lag, that is, a delay time or a time lag between the two. If this time lag is set appropriately, for example, the height of the headrest can be prevented from being adjusted within an average time required for the occupant to determine the angle of the necklace.

  The height of the headrest corresponding to the angle of the necklace may be obtained by a predetermined calculation such as a linear expression, but a correspondence table of the angle of the necklace and the height of the headrest is prepared in advance, You may obtain | require the height (movement amount) of a headrest with reference to the table.

  Further, as described above, in the configuration in which the value obtained when the electric circuit of the vehicle is activated is stored in a memory (not shown) provided in the drive box, the changed necklace is changed after step S603. It is preferable to update the angle as current data.

  Furthermore, in the present embodiment, it has been described that the height adjustment operation of the headrest is performed in response to the angle change of the necklace. However, the headrest only corresponds to the angle change that causes the occupant to displace the necklace backward. The height adjustment operation is automatically performed, and the occupant may manually adjust the headrest height in response to an angle change that displaces the necklace forward.

  In addition, in the above embodiment, the adjusting means includes an arithmetic device and a motor, and the height of the headrest is adjusted by the electric means based on the angle information of the necklace output from the encoder. Alternatively, the height of the headrest may be mechanically adjusted in accordance with a change in the angle of the necklace using a link mechanism or the like. Even in such a mechanical adjustment configuration, the timing of the change in the angle of the necklace and the accompanying adjustment operation may be substantially the same or may be shifted in time. .

  As described above, according to the present embodiment, the height of the headrest body is automatically adjusted when the angle of the necklace is changed by an occupant's operation. The troublesome adjustments can be reduced, and the occupant's head can be appropriately held according to the angle of the seat back. Furthermore, since the space | interval of the lower part of a headrest and a seat back upper end is suppressed so that it may not become less than predetermined value, it can prevent a passenger | crew's hair, clothing, etc. being pinched.

<Other embodiments>
In addition, this invention is not limited to embodiment, It includes the various other embodiment which can be considered by those skilled in the art.

  In the above embodiment, the headrest is composed of the center portion and the upper headrest body and the U-shaped necklace. However, the structure and shape of the headrest are not limited thereto, and the shape and structure of the headrest body and / or necklace. Can be various. For example, the necklace (lower moving part) only needs to be able to move in the front-rear direction relative to the headrest body (upper headrest part), and may have a shape without both side parts.

  Moreover, in the said embodiment, although the structure provided with the drive box which has a calculating device inside a seat back was demonstrated exemplarily, if a calculating device and a drive box are provided in a suitable position according to a structure and specification of a vehicle. The position where these are provided is not limited to the above example.

It is a figure which shows the back leaning state which changed the angle of the seat back of the vehicle seat of the 1st Embodiment of this invention to the horizontal side. It is a figure which shows the standing state which changed the angle of the seat back of the vehicle seat of the 1st Embodiment of this invention to the vertical side. It is a fragmentary perspective view which shows the structural example of the adjustment means of 1st Embodiment. It is a flowchart of the adjustment process by the adjustment means of 1st Embodiment. It is a fragmentary perspective view which shows the structural example of the adjustment means of the 2nd Embodiment of this invention. It is a flowchart of the adjustment process by the adjustment means of 2nd Embodiment. It is the schematic which shows typically the layout in the vehicle in which the vehicle seat which concerns on this invention is attached. It is the elements on larger scale explaining the reclining mechanism of the vehicle seat which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle seat 11 Seat cushion 12 Seat back 13 Headrest 20 Crew 104 Operation lever 131 Headrest body 132 Necklace 170 Rotating shaft 175 Sensor

Claims (6)

A seat back, a reclining mechanism that allows adjustment of the angle of the seat back with respect to the vertical direction, and a headrest installed around the upper end of the seat back;
The headrest is positioned above the headrest so that the amount of movement in the front-rear direction relative to the upper headrest portion can be adjusted between the upper headrest portion supported by the seat back and the lower side of the upper headrest portion. In the vehicle seat composed of the lower moving part disposed,
Corresponding to a change in the angle of the seat back by the reclining mechanism unit, there is provided an adjusting means for adjusting at least a movement amount in the height direction of the upper headrest part or a movement amount in the front-rear direction of the lower movement part. A vehicle seat characterized by the above.   2. The vehicle according to claim 1, wherein the adjusting unit includes a height adjusting unit that moves at least the upper headrest portion upward in response to a change in the angle of the seat back to the vertical side. Sheet.   The vehicle seat according to claim 2, wherein the height adjusting means suppresses at least the downward movement of the upper headrest portion in response to an angle change of the seat back to the horizontal side. .   The adjusting means includes forward / backward moving amount adjusting means for displacing the lower moving portion rearward or allowing rearward displacement in response to an angle change of the seat back to the vertical side. The vehicle seat according to claim 1 or 2.   The vehicle seat according to claim 4, wherein the lower moving unit is configured to be able to adjust a front-rear moving amount by a pressing force toward the rear side that is equal to or greater than a predetermined value by an occupant head. . A seat back, a reclining mechanism that allows adjustment of the angle of the seat back with respect to the vertical direction, and a headrest installed around the upper end of the seat back;
The headrest is positioned above the headrest, and an upper headrest portion supported by the seatback and a lower side of the upper headrest portion can adjust the amount of movement in the front-rear direction with respect to the upper headrest portion. In the vehicle seat composed of the lower moving part disposed,
A vehicle seat, comprising: an adjustment unit that adjusts a movement amount of the upper headrest portion in a height direction in response to a predetermined adjustment of a movement amount of the lower movement portion in the front-rear direction.

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