JP4517295B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat, and particularly to a vehicle seat provided with a headrest.

  In general, a headrest is provided in a seat of an automobile, and the head of the occupant is supported or held by the headrest. In addition, the headrest can hold the occupant's head more effectively for sudden acceleration and deceleration of the vehicle.

  Recently, as a headrest of a vehicle seat, a so-called “kura-shaped” headrest is used which has an upper portion supported by a pole member extending from a seat back so as to be movable up and down and a lower portion extending forward and downward. Yes. In the case of a vehicle seat using this type of headrest, the headrest is lifted to the upper use position when using the headrest when the occupant is seated on the seat, and is used when the headrest is not used when the occupant is not seated on the seat. Since the seat is lowered to the lowest position, the use of such a seat in the rear seat has the advantage that the headrest does not interfere with the driver's rear view. There is an advantage of not disturbing the side view of.

  An example using a pillow-shaped headrest is disclosed in Patent Document 1. The vehicle seat disclosed in Patent Document 1 is a type in which the headrest cannot be moved in the vertical direction and is fixed, and does not exhibit the advantages of the above-described head-shaped headrest, but is embedded in the seat cushion. The angle of the headrest in the front-rear direction can be adjusted by an electric drive mechanism.

JP 2005-65836 A

  Here, unlike the type of Patent Document 1, in the case of a vehicle seat using a headrest having a shape that can move in the vertical direction via a pole member provided on the seat back, the lower end of the headrest is the top of the seat back. If the headrest is moved downward, there is a problem that the headrest (the lower end portion thereof) interferes with the seat back (top portion).

  Accordingly, the present invention has been invented to solve the above-described problem, and provides a vehicle seat that can suppress interference of the headrest with the seatback when the headrest is moved downward. For the purpose.

  In order to achieve the above object, a vehicle seat according to the first invention of the present application includes a seat back, a headrest whose lower end portion constitutes a neck support portion for supporting the periphery of the neck of an occupant, and the headrest as the seat back. From the top of the seat back to support the headrest at a desired height position between the lowest position lowered relative to the uppermost position where the headrest is raised most with respect to the seat back. A headrest pole member that is slidably supported by the seat back so as to be able to extend, and a lower end portion of the neck support portion can be positioned below a top portion of the seat back. The headrest is supported so that the upper portion of the headrest is pivotable about a pivot shaft extending in the width direction of the seat back. Rotation support means for holding the dress at a predetermined angle with respect to the rotation axis, and a lower end portion of the headrest located above the top portion of the seat back is moved below the top portion of the seat back. Sometimes it has an interference suppression means for suppressing interference of the headrest with the seat back.

In the configuration of the present invention, since the interference suppressing means is provided, even when the lower end of the headrest is positioned above the top of the seatback when the headrest is lowered to the lowest position, for example, The interference of the headrest with respect to can be suppressed.
In particular, in the headrest configured so that the lower end of the headrest, that is, the lower end of the neck support portion can be positioned below the top of the seatback and in front of the front of the seatback in this state, the headrest is at the lowest position. By doing so, the distance from the top of the seat back to the top of the headrest can be made relatively short (for example, in the range of 0 to 20 cm), thereby making it possible to secure the driver's rear and side view. In many cases, the headrest is adjusted to the lowest position while no occupant is seated on the seat. That is, since the headrest is lowered to the lowest position at a high frequency, the operability of the occupant who lowers the headrest can be significantly improved by suppressing the interference of the headrest with the seat back when the headrest is lowered to the lowest position.

  In the first aspect of the present invention, the interference suppression means is configured such that the separation distance between the lower end portion of the neck support portion and the headrest pole member is shorter than the shortest separation distance that can be taken at the lowest position of the headrest. It is preferable to restrict the backward rotation of the headrest around the rotation axis so as not to be shortened. According to this, interference of the headrest with respect to the seat back can be suppressed with a simple structure.

Furthermore, in the first invention, the interference suppression means is configured such that the separation distance between the lower end portion of the neck support portion and the headrest pole member is shorter than the shortest separation distance that can be taken at the lowest position of the headrest. The headrest is allowed to additionally extend and rotate backward about the rotation axis so as to shorten, and when the headrest that has been additionally extended and rotated is moved toward the lowest position, It is preferable to have forcible moving means for rotating the headrest forward about a rotation axis.
According to this structure, the interference restraining means expands the allowable range of rotation of the headrest, and it is possible to provide more appropriate neck support, while providing forcible movement means to suppress the headrest interference with the seat back. can do.

  Furthermore, in the first aspect of the invention, it is preferable that the forcible moving means is constituted by an inclined surface that is formed on an upper front surface of the seat back or a rear lower surface of the headrest and extends forward and downward of the seat. . According to this structure, the interference of the headrest with respect to the seat back can be suppressed with a simple structure.

  In the first aspect of the invention, the headrest pole member is positioned so as to extend at an angle closer to the vertical than the seat back when the seat back is inclined rearward of the seat from the vertical. It is preferable. According to this structure, the supportability of the head can be improved.

  If the headrest pole member is configured to extend at an angle closer to the vertical than the seat back, when the occupant lowers the headrest to the lowest position, the extension direction of the headrest pole member is insufficient due to insufficient recognition of the extension direction of the headrest pole member. Accordingly, a force tends to be generated so as to move the neck support portion backward, and interference of the headrest with the seat back is likely to occur. The lack of recognition of the direction of extension of the headrest pole member is because the neck support part is located in front of the headrest pole member, and when the occupant tries to lower the headrest from the front of the seat, the headrest pole member is hidden by the neck support part. It is easy to occur because it cannot be seen. On the other hand, in the first invention, as described above, such interference can be suppressed by the interference suppression means while improving the supportability.

  In order to achieve the above object, a vehicle seat according to a second invention of the present application includes a seat back, a headrest body, a lowest position where the headrest body is lowered with respect to the seatback, and the headrest body is the seat. For supporting the headrest body at a desired height position between the highest position raised with respect to the back, the seat back is slidable so as to extend upward from the top of the seat back. A supported headrest pole member, a neck support member for supporting the periphery of the occupant's neck, and the neck support member supported on the headrest body so as to be rotatable about a rotation axis extending in the width direction of the seat back. Rotation support means for holding the neck support member at a predetermined angle with respect to the rotation shaft, The lower end portion of the support member is configured to be positioned below the top portion of the seat back, and the lower end portion of the neck support member positioned above the top portion of the seat back is lower than the top portion of the seat back. And an interference suppression means for suppressing interference of the lower end portion of the neck support member with the seat back when moving downward.

  In the configuration of the second aspect of the present invention, since the interference suppression means is provided, for example, when the headrest body is lowered to the lowest position, the lower end portion of the headrest pole member is positioned above the top portion of the seat back. However, the interference of the headrest pole member with the seat back can be suppressed. Moreover, since it was set as the structure which supports a neck support member rotatably with respect to a headrest main body, a passenger | crew's neck part can be supported appropriately by a neck support member.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle seat which can suppress the interference of the headrest with respect to a seat back when moving a headrest below can be provided.

Hereinafter, an embodiment of a vehicle seat according to the present invention will be described with reference to the accompanying drawings.
1 to 5 show a first embodiment of a vehicle seat according to the present invention.

  A vehicle seat according to a first embodiment generally indicated by reference numeral 1 in FIGS. 1 to 4 includes a seat cushion 2 and a seat back 3 rotatably attached to the seat cushion 2 by a hinge mechanism 4. And have.

  The hinge mechanism 4 has a conventional knuckle structure, and the seat back 3 is pivoted backward (reversed backward) about the pivot shaft 4A of the hinge mechanism 4 by operating a lever (not shown). ) And a reclining mechanism that fixes at an arbitrary angle is configured. The hinge mechanism 4 also rotates the seat back 3 toward the front of the seat 1 around the rotation shaft 4A until the occupant support surface 2A of the seat cushion 2 and the occupant support surface 3A of the seat back 3 are substantially parallel. It can be moved (forward or prone). Hereinafter, a state in which the seat back 3 is moved forward until the occupant support surface 2A of the seat cushion 2 and the occupant support surface 3A of the seat back 3 are substantially parallel is referred to as a “full flat state”. When the seat back 3 is in the fully flattened state, the back surface 3B of the seat back 3 and the floor (not shown) of the vehicle luggage compartment are substantially flush, that is, full flattened and the cargo space is expanded. The For this purpose, the back surface 3B of the seat back 3 is preferably flat.

  As can be clearly seen in FIG. 2, the headrest pole member 5 is slidably supported on the seatback 3 so as to extend upward from the top 3 </ b> C of the seatback 3.

  The seat back 3 is formed with a pair of guide holes (not shown) extending downward from the top 3C, and a guide sleeve 6 is disposed in each guide hole (not shown). The guide sleeve 6 is supported by a support member 7, and the support member 7 is fixed to a support frame (not shown) attached inside the seat back 3.

  As can be clearly seen in FIG. 3, the headrest pole member 5 has an overall U shape and is constituted by a pair of poles 5 </ b> A and 5 </ b> B and a horizontal shaft 5 </ b> C extending between these poles. The poles 5A and 5B of the headrest pole member 5 are slidably received in a guide hole (not shown) of the seat back 3 and a guide sleeve 6 disposed in the guide hole, and a conventional sliding holding mechanism (not shown). ) Is releasably locked to the seat back 3 at a position protruding from the top 3C of the seat back 3 by a desired amount.

A headrest 10 is attached to the headrest pole member 5.
The headrest 10 has an upper base portion 10A in which the entire horizontal shaft 5C of the headrest pole member 5 and a part of the poles 5A and 5B are embedded, and a support portion 10B extending downward from the front portion of the upper base portion 10A. In the present application, the concept of “upper” and “lower” means that when the seat is in a state enabling seating of an occupant, for example, as shown in FIG. It is used based on when it is in a state.

The headrest 10 is called a “kura-type headrest”, and when viewed from the side, as shown in FIG. 1 and FIG. 2, the headrest 10 has an overall inverted L shape, and when viewed from the front, is shown in FIG. 3. Is a rectangle.
The lower end portion of the support portion 10B of the headrest 10 constitutes a neck support portion 11 for supporting the periphery of the occupant's neck, and this neck support portion 11 is substantially lower in order to easily support the occupant's neck. It is formed so as to be thick.

As understood from FIGS. 1 and 4, an annular headrest frame 12 extending along the edge portion is embedded in the headrest 10.
The vehicle seat 1 also supports the headrest 10 such that the upper base 10A, which is the upper portion of the headrest 10, is pivotable about a pivot shaft extending in the width direction of the seat 1, and the headrest 10 is supported on the pivot shaft. It has a rotation support means for holding it at a predetermined angle. In this embodiment, the rotation shaft is constituted by the horizontal shaft 5 </ b> C of the headrest pole member 5.

  As best understood from FIG. 4, the rotation support means has a pair of journals 20 </ b> A and 20 </ b> B extending from the headrest frame 12 of the headrest 10 and rotatably attached to the horizontal shaft 5 </ b> C of the headrest pole member 5. . Thereby, the headrest 10 can be rotated around the horizontal shaft 5C in the upper base portion 10A.

  The rotation support means also includes a claw wheel 21 fixed to the horizontal shaft 5C between the pair of journals 20A, 20B, and one of a plurality of teeth 21A formed on the claw wheel 21 extending from the headrest frame 12 of the headrest 10. And a ratchet mechanism including a selectively engaging pawl 22. By this ratchet mechanism, the headrest 10 is held at a predetermined angle with respect to the horizontal shaft 5C according to the position of the tooth 21A of the stationary claw wheel 21 with which the claw 22 of the headrest frame 12 is engaged.

  The vehicle seat 1 is further provided when the lower end portion of the headrest 10 is moved below the top portion 3C of the seat back 3 from the state where the lower end portion of the headrest 10 is located above the top portion 3C of the seat back 3. 3 has an interference suppression means for suppressing interference of the headrest 10 with respect to 3. This interference suppression means is constituted by the terminal ends of a plurality of teeth 21 </ b> A formed continuously in the circumferential direction of the claw wheel 21.

  The region in which the plurality of teeth 21A are continuously formed in the circumferential direction of the claw wheel 21 is terminated at the first terminal end 23A and the second terminal end 23B, whereby the headrest pole member 5 and eventually the headrest 10 with respect to the seat back 3 The rotation range is allowed between the first end 23A and the second end 23B, and is restricted by the first end 23A and the second end 23B.

  The first end 23A has the headrest 10 lowered most with respect to the seat back 3 so that the distance between the lower end of the neck support portion 11 and the poles 5A and 5B of the headrest pole member 5 is indicated by a solid line in FIG. Positioning is performed so as not to be shorter than the shortest possible separation distance D at the “lowermost position”. The headrest in a state where the lower end portion of the neck support portion 11 is positioned above the top portion 3C of the standing seat back 3 by positioning the first terminal end 23A and restricting the backward rotation of the headrest 10 in this manner. Even when 10 is lowered, it is possible to prevent the lower end portion of the neck support portion 11 from interfering with the top surface 3 </ b> C of the seat back 3.

  As can be clearly seen in FIGS. 1 and 2, when the headrest 10 is at the lowest position where the headrest 10 is lowered with respect to the seat back 3, the lower end portion of the neck support portion 11 is a seat in a standing state. The size and shape are determined so as to be located below the top 3C of the back 3. By configuring the headrest 10 so that the lower end portion of the neck support portion 11 can be positioned below the top portion 3C of the seatback 3 in the standing state, the amount of the headrest 10 protruding upward from the seatback 3 can be reduced. Therefore, it is possible to prevent the seat back 3 from interfering with the front seat without having to remove the headrest 10 from the seat back 3 when the seat back 3 is moved forward to make it fully flat. To. Similarly, when the seat 1 is a front seat, it is possible to prevent interference with an instrument panel or the like.

  Further, when the seat back 3 is in the standing state, the amount of the headrest 10 protruding upward from the seat back 3 can be reduced, and the hindrance to the rear view of the front seat occupant can be reduced. Similarly, when the seat 1 is the front seat, it is possible to reduce the hindrance to the front view of the rear seat occupant.

  Furthermore, since the neck support part 11 can be positioned low, it is possible to support the periphery of the neck of an occupant with a low seating height, such as a child. When the length (distance along the seat back 3) from the buttocks of the occupant seated on the seat 1 to the top 3C of the seat back 3 is 80 cm to 85 cm, the lower end of the neck support portion 11 is the top 3C of the seat back 3. It is preferable that it can be located 20-40 cm below.

  In this embodiment, a part of the occupant support surface 3A and the top part 3C of the seat back 3 is cut, and a storage cutout part 201 for storing a part (inner edge part) of the headrest 10 is configured. By forming the storing and cutting part 201 in the seat back 3, it is possible to reduce the amount of the headrest 10 protruding forward and upward from the occupant support surface 3A and the top part 3C of the seat back 3, respectively.

  In order to minimize the interference between the headrest 10 and the occupant support surface 2A of the seat cushion 2 when the seat back 3 is in the fully flat state, the back surface of the support portion 10B of the headrest 10 is positioned at the lowest position. In “the lowermost state of the headrest housing” that is rotated most backward in the case of FIG. Further, in order to minimize the thickness of the headrest 10 that protrudes upward from the top 3C of the seat back 3 when the headrest 10 is at the lowest position, the back surface of the upper base portion 10A of the headrest 10 is the shape of the storing and cutting portion 201. It is shaped so as to complement.

Next, the operation of the vehicle seat 1 configured as described above will be described.
When the neck of the occupant P is supported by the headrest 10 in the lowermost state where the headrest is housed as shown by the solid line in FIG. 2, first, while resisting the sliding resistance of a sliding holding mechanism (not shown), the headrest pole member 5 and, The headrest 10 attached thereto is moved upward, for example, to the position indicated by the alternate long and short dash line in FIG. 2, and the neck support portion 11 of the headrest 10 is positioned (held) at the height of the neck of the occupant P.

  Subsequently, the headrest 10 is centered on the horizontal axis 5C of the headrest pole member 5 to a position suitable for supporting the neck of the occupant P by the neck support portion 11 (for example, a position indicated by a two-dot chain line in FIG. 2). Rotate clockwise as viewed in FIG. When a force is applied to the headrest 10 so as to rotate the headrest 10 in the clockwise direction when viewed in FIG. 2, the claw 22 of the headrest frame 12 of the headrest 10 has a first end around the horizontal axis 5 </ b> C of the headrest pole member 5. The arc is moved from 23A toward the second end 23B. When the force is no longer applied, the claw 22 is engaged and locked with the tooth 21A of the claw wheel 21, and the headrest 10 is held at a certain angle with respect to the horizontal shaft 5C. The ratchet mechanism is preferably configured such that it takes 30N to 100N to rotate the headrest 10.

  When moving the headrest 10 downward, a downward force is applied to the headrest 10. When the neck support portion 11 is rotated in the counterclockwise direction when viewed in FIG. 2, the backward rotation of the headrest 10 with respect to the seat back 3 is caused by the plurality of teeth 21 </ b> A continuously formed in the circumferential direction of the ratchet wheel 21. Since it is limited by the end of the region, when the lower end portion of the headrest 10 is moved below the top portion 3C of the seat back 3 from the state where the lower end portion of the headrest 10 is located above the top portion 3C of the seat back 3 Not only, but the headrest 10 does not interfere with the seat back 3 when the headrest 10 moves downward.

Next, FIG. 5 thru | or FIG. 7 shows 2nd Embodiment of the vehicle seat by this invention.
Since the vehicle seat 100 of the second embodiment has the same overall configuration as the vehicle seat 1 of the first embodiment, only differences from the vehicle seat 1 will be described, and common parts will be described. The description of the configuration and operation is omitted. In addition, the same reference number used for the component of the vehicle seat 1 is used for the component of the vehicle seat 100 which is common to the component of the vehicle seat 1.

  In the vehicle seat 100, the separation distance between the lower end of the neck support portion 11 and the poles 5 </ b> A and 5 </ b> B of the headrest pole member 5 is lowered most with respect to the seatback 3 as indicated by a solid line in FIG. 5. The shortest separation distance D that can be taken at the “lowermost position”, in other words, the lower end of the neck support portion 11 and the poles 5A, 5B of the headrest pole member when the headrest 10 is in the “headrest accommodating lowermost state” The headrest 10 is configured to allow additional extension rotation around the rotation shaft 5C to the position indicated by a two-dot chain line in FIG. 5 so as to be shorter than the separation distance D between the two. . Such an additional extension rotation of the seat 100 beyond the headrest 10 beyond the rearward rotation of the headrest 10 in the seat 1 is performed by the first end 23A of the ratchet wheel 21 as shown in FIGS. The position is provided by positioning it higher than in the sheet 1. Thereby, the rotation allowable range of the headrest 10 is expanded, and it becomes possible to provide more appropriate neck support.

  On the other hand, when the vehicle seat 100 moves the headrest 10 additionally extended and rotated rearward toward the “lowermost position”, the vehicle seat 100 is forcibly moved to rotate the headrest 10 forward about the horizontal axis 5C. Have The forcible moving means is constituted by a slope 101 that is formed on the front surface of the storing and cutting portion 201 of the seat back 3 and extends forward and downward of the seat 100. By providing the inclined surface 101 on the seat back 3, the interference of the headrest 10 with the seat back 3 can be suppressed.

  In order to smoothly move the lower portion of the neck support portion 11 that abuts the slope 101 along the slope 101, it is preferable that either the slope 101 or the neck support portion 11 is formed relatively hard. In the present embodiment, the neck support portion 11 is softly formed with respect to the inclined surface 101 for the purpose of improving the neck support performance and comfort of the neck support portion 11. Further, by forming the inclined surface 101 relatively hard, it is possible to reduce the strong contact between the human body and the rigid poles 5A and 5B at the time of rearward collision when the headrest is positioned on the upper side. be able to.

Finally, FIGS. 8 to 11 show a third embodiment of the vehicle seat according to the present invention.
Since the vehicular seat 200 of the third embodiment also has the same overall configuration as the vehicular seat 1 of the first embodiment, only differences from the vehicular seat 1 will be described, and common portions The description of the configuration and operation of is omitted. In addition, the same reference number used for the component of the vehicle seat 1 is used for the component of the vehicle seat 200 which is common to the component of the vehicle seat 1.

  As shown in FIG. 8, the vehicle seat 300 has a headrest 10 that has the same overall shape as the headrest 10 of the vehicle seat 1 in appearance, but the headrest main body 301 and the headrest main body 301 are different from each other. The vehicle seat 1 is different from the vehicle seat 1 in that the neck support member 302 is configured to support the periphery of the occupant's neck.

  The headrest body 301 is fixed to the headrest pole member 5 and is not rotated with respect to the horizontal axis 5C of the headrest pole member 5 but only moves up and down together with the headrest pole member 5.

  The neck support member 302 is generally U-shaped when viewed from the front, and is supported by the rotation support means so as to be rotatable about the rotation axis extending in the width direction of the seat 300 at the upper portion of the headrest body 301. The rotation axis is held at a predetermined angle. A lower edge portion of the neck support member 302, that is, a portion of the portion that is positioned below the lower edge portion of the headrest body 301 and extends in the horizontal direction when viewed in FIG. 8 is the neck support portion 11 in the vehicle seat 1. Configure.

  As can be clearly seen in FIG. 9, the rotation support means includes a rotating shaft 304 extending coaxially with the horizontal shaft 5 </ b> C outward from each end of the horizontal shaft 5 </ b> C of the headrest pole member 5, and coaxial with the rotating shaft 304. And a ratchet wheel 306 attached thereto.

  The neck support member 302 includes a neck support frame 307 that extends along the shape thereof and is generally U-shaped when viewed from the front. At each end portion of the U-shaped neck support frame 307, journals 305A and 305B that are rotatably attached to a rotation shaft 304 extending from the headrest pole member 5 are provided. As a result, the neck support member 302 can rotate around the rotation shaft 304.

  A part of the rotating shaft 304 and the ratchet wheel 306 are accommodated in an internal space S formed inside the neck support member 302. A plurality of teeth 306A are formed around a portion of the claw wheel 306, and the neck support frame 307 is provided with a claw 311 that selectively engages with one of the teeth 306A of the claw wheel 306. By engaging the teeth 306A of the ratchet wheel 306 with the claws 311 of the neck support frame 307, the neck support member 302 is attached to the rotating shaft 304 according to the position of the teeth 306A of the stationary tooth wheel 306 with which the hook 311 is engaged. On the other hand, it is held at a predetermined angle.

  Interference suppression means is configured by the end of the region of the plurality of teeth 306A formed continuously in the circumferential direction of the ratchet wheel 311. The interference suppression means suppresses the interference of the headrest 10 with the seat back 3. It is the same as in

The operation of the vehicle seat 300 having the above-described configuration will be described.
When the periphery of the occupant's neck is supported by the headrest 10 in the lowermost state where the headrest is accommodated as shown by the solid line in FIG. 10, first, the sliding of the sliding holding mechanism (not shown) described in relation to the vehicle seat 1 is first performed. While resisting dynamic resistance, the headrest pole member 5 and, consequently, the headrest body 301 attached to the headrest pole member 5 are moved upward, and the neck support portion 11 of the neck support member 302 attached to the headrest body 301 is raised to the height of the occupant's neck. Position (hold).

  Subsequently, when the neck support member 302 is viewed in FIG. 10 around the horizontal axis 5C and the rotation axis 304 of the headrest pole member 5 to a position suitable for supporting the periphery of the occupant's neck by the neck support portion 11. The headrest body 301 is rotated clockwise. When force is applied to the neck support member 302 in this way, the claw 311 of the neck support frame 307 of the neck support member 302 moves along the teeth 306A of the claw wheel 306 around the horizontal axis 5C and the rotation axis 304 of the headrest pole member 5. Moved in an arc. When the force is no longer applied, the claw 311 is engaged and locked with the teeth 306A of the claw wheel 306, and the neck support member 302 is held at a certain angle with respect to the horizontal shaft 5C and the rotation shaft 304.

  When the neck support member 302 is thus rotated forward in the seat front-rear direction with respect to the headrest main body 301, a recessed portion 303 is formed between the neck support member 302 and the headrest main body 301 as shown in FIG. The head support surface 303 </ b> A is formed by the inner end surface of the neck support member 302 on the side in the width direction of the recessed portion 303. Thus, the dent portion supports the passenger's head and can prevent shaking during traveling. In particular, the head support surface 303A can support the head of the occupant P when the vehicle on which the seat 300 is mounted rolls, and can prevent the head from shaking during traveling.

  Further, when the neck support member 302 is used, when the neck support member is largely rotated toward the occupant side, the support performance is improved and the seat back is moved forward to make it flat. By rotating the neck support member toward the seat back side and tilting the seat back forward, the back surface of the seat back can be more surely brought into a nearly horizontal state.

  When moving the headrest 10 downward, a downward force is applied to the headrest 10. When the neck support member 11 rotates counterclockwise when viewed in FIG. 10, the rearward rotation of the neck support member 302 relative to the headrest body 301 is a plurality of teeth formed continuously in the circumferential direction of the ratchet wheel 306. Since it is limited by the end of the region 306A, the neck support portion 11 is positioned below the top portion 3C of the seat back 3 from the state where the neck support portion 11 of the neck support member 302 is located above the top portion 3C of the seat back 3. The neck support member 302 does not interfere with the seat back 3 when the headrest 10 is moved downward.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
For example, in the second embodiment, the inclined surface 101 is provided on the seat back 3, but the inclined surface 101 may be formed on the rear surface of the lower end portion (neck support portion 11) of the headrest 10.

  Moreover, in each embodiment, although the storage cut part 201 is formed in the seat back 3, the storage cut part 201 does not need to be formed.

  Furthermore, the interference restraint means of the present invention may be configured to detect a state in which the headrest is lowered and rotate the headrest forward so as not to interfere with the seat back. Specifically, a detection sensor for detecting the downward movement speed of the headrest pole member is attached to the guide sleeve, and an angle detection sensor for detecting the rotation angle of the headrest and a driving means for driving the headrest to rotate are arranged in the headrest. Built in. Then, when it is detected by the detection sensor that the headrest is lowered, it is determined whether or not it interferes with the seat back from the current rotation angle of the headrest. Is rotated forward by a predetermined angle so as not to interfere with the seat back. This also prevents the headrest from interfering with the seat back.

  Furthermore, in each of the embodiments described above, the extending direction of the headrest pole member is the same as the extending direction of the seat back in the upright state, but the extending direction around the guide sleeve 6 is more than the extending direction. A direction close to the vertical direction (M in FIG. 2) may be set. With such a configuration, for example, it is possible to improve head support by a headrest upper part and a neck support part for a tall occupant, and a headrest that becomes a problem when lowering the headrest in the setting of such a headrest pole member, Interference problems with the seat back can be reliably prevented.

1 is a schematic side view of a vehicle seat according to a first embodiment of the present invention. FIG. 2 is a partially enlarged schematic side view of the sheet of FIG. 1. It is a partial schematic front view of the sheet | seat which shows the internal structure of a headrest. It is a partial schematic perspective view of the sheet | seat which shows the internal structure of a headrest. It is a partial schematic side view of the vehicle seat of 2nd Embodiment of this invention. FIG. 6 is a partial schematic perspective view of a seat showing an internal structure of a headrest of the seat of FIG. 5. It is the partial schematic front view of a sheet | seat shown in the state which removed the headrest. It is a partial schematic perspective view of the vehicle seat of 3rd Embodiment of this invention. FIG. 9 is a partial schematic front view of the seat of FIG. 8 showing the internal structure of the headrest. It is a partial schematic side view of the sheet | seat of FIG. FIG. 9 is a partial schematic perspective view of the seat of FIG. 8 shown in a state where the headrest is moved upward and the neck support member is rotated forward.

Explanation of symbols

1, 100, 300 Vehicle seat 3 Seat back 5 Headrest pole member 10 Headrest 11 Neck support

Claims (6)

Seat back,
A headrest whose lower end constitutes a neck support part for supporting the periphery of the occupant's neck; and
The headrest is supported at a desired height position between a lowest position where the headrest is lowered with respect to the seatback and an uppermost position where the headrest is raised with respect to the seatback. A headrest pole member slidably supported on the seat back so as to be able to extend upward from the top of the seat back, the lower end of the neck support portion being below the top of the seat back, It is configured so that it can be positioned in front of the seat back front,
Rotation support means for supporting the headrest so that the upper portion of the headrest is pivotable about a pivot shaft extending in the width direction of the seat back, and holding the headrest at a predetermined angle with respect to the pivot shaft. ,
Interference suppression means for suppressing interference of the headrest with the seat back when the lower end portion of the headrest located above the top portion of the seat back is moved downward than the top portion of the seat back. A vehicle seat characterized by that.   The interference suppression means is configured to rotate the rotation distance so that a separation distance between a lower end portion of the neck support portion and the headrest pole member is not shorter than the shortest separation distance that can be taken at the lowest position of the headrest. The vehicle seat according to claim 1, wherein rearward rotation of the headrest about an axis is restricted. The interference suppression means is configured so that the headrest is arranged such that a separation distance between a lower end portion of the neck support portion and the headrest pole member is shorter than the shortest separation distance that can be taken at the lowest position of the headrest. Allowing additional extension rotation around the rotation axis,
2. The vehicle according to claim 1, further comprising a forcible moving means for rotating the headrest forward about the rotation axis when the additional extended rotation headrest is moved toward the lowest position. 3. Sheet.   The vehicle seat according to claim 3, wherein the forcible moving means is configured by an inclined surface that is formed on an upper front surface of the seat back or a rear lower surface of the headrest and extends forward and downward of the seat.   The headrest pole member is positioned so as to extend at an angle closer to the vertical than the seat back when the seat back is inclined to the rear of the seat from the vertical. Vehicle seat. Seat back,
The headrest body,
In order to support the headrest body at a desired height position between the lowest position where the headrest body is lowered with respect to the seatback and the uppermost position where the headrest body is raised with respect to the seatback. A headrest pole member slidably supported on the seat back so as to extend upward from the top of the seat back;
A neck support member for supporting the periphery of the occupant's neck,
The neck support member is supported by the headrest body so as to be rotatable about a rotation shaft extending in the width direction of the seat back, and a rotation for holding the neck support member at a predetermined angle with respect to the rotation shaft. Dynamic support means,
The lower end portion of the neck support member is configured to be positioned lower than the top portion of the seat back and in front of the front surface of the seat back,
In order to suppress interference of the lower end portion of the neck support member with the seat back when the lower end portion of the neck support member positioned above the top portion of the seat back is moved downward from the top portion of the seat back. And a vehicle seat.

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