JP2005296517A - Headrest device - Google Patents

Abstract

To provide a headrest device having a simple structure and capable of easily performing an adjusting operation.
If the headrest 4 is rotated against the spring force of a torsion coil spring 12A toward the front of the vehicle where the lock groove 6 is disengaged from the lock tooth 11 and the rotational force is released at a required vertical adjustment position, the headrest 4 is restored to its original rotational position by the torsion coil spring 12A, and the lock groove 6 adapted to the height position is engaged with the lock tooth 11 to determine the headrest position.
[Selection] Figure 1

Description

  The present invention relates to a headrest device used for an automobile seat or the like.

As is well known, headrests used in automobile seats are arranged so that the vertical position can be adjusted according to the head position of the seated occupant. A device in which the headrest is moved up and down via a cable routed inside the seat back is known (see Patent Document 1).
JP 2003-93191 A (2nd page, FIG. 2)

  In the conventional headrest device, a headrest lifting guide mechanism and a lifting operation force transmission mechanism such as a cable and a pulley are provided inside the seatback, while a knob provided on the side portion of the seatback is used to define a headrest position. Since the mechanism (lock mechanism) is provided, it cannot be denied that the structure becomes complicated and disadvantageous in terms of cost.

  Accordingly, the present invention provides a headrest device that has a simple structure and can be easily adjusted.

In the present invention, a headrest stay that protrudes from the bottom surface of the headrest and has a plurality of engagement portions in a vertical direction,
A cylindrical sticker that is provided on the upper frame of the seat back frame so as to be pivotable in the front-rear direction, and that fits and holds the headrest stick slidably in the vertical direction;
A lock tooth that is provided on a seat back frame and engages with one of the engaging portions of the headrest stay to define a vertical position of the headrest;
The main feature is that it includes urging means for urging the headrest in the rotation direction of the sticker so that the engagement portion and the lock tooth are engaged with each other.

  According to the present invention, when adjusting the vertical position of the headrest, the headrest is rotated against the urging force of the urging means in the direction in which the engaging portion is disengaged from the lock tooth, and the rotational force is released at the required vertical adjustment position. Then, the headrest is rotated and restored to the original rotational direction position by the urging means, and the engaging portion adapted to the height position is engaged with the lock tooth to determine the headrest position.

  Therefore, the occupant can easily adjust the position of the headrest by simply moving and adjusting the headrest in the vertical direction while rotating in one direction, and the stay holder can be rotated in the front-rear direction with respect to the upper frame. It is possible to obtain a simple structure in which the urging means for urging and urging the headrest in the direction in which the engaging portion engages with the lock tooth can be provided, and the number of parts can be reduced and the cost can be advantageously obtained. Can do.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 5 show a first embodiment of a headrest device according to the present invention, FIG. 1 is a perspective view showing an assembled state of a seat back frame and a headrest stay, and FIG. 2 is an enlarged perspective view of a portion A in FIG. 3 is an enlarged perspective view of a portion B in FIG. 1, FIG. 4 is a perspective view similar to FIG. 1 showing a state in which the headrest is rotated, and FIG. 5 is an engagement state of the engagement portion and the lock tooth (a). It is a side view which shows the engagement release state of an engaging part and a lock tooth in (b), respectively.

  In the headrest device according to the first embodiment, as shown in FIG. 1, the seat back frame 1 is composed of a side frame 2 composed of a pair of left and right plate members, and a round bar material joined and disposed between upper end portions of the side frames 2. And a front gate type upper frame 3.

  The headrest 4 is provided with a headrest stay 5 in which a round bar is bent into a front gate shape, and both leg portions 5a are protruded from the bottom surface of the headrest 4. On the front side, a plurality of substantially horizontal locking grooves 6 as engaging portions are provided in a multi-stage shape in the vertical direction at a required equal interval.

  On the other hand, a pair of left and right cylindrical stick holders 7 are provided on the upper side 3a of the upper frame 3 of the seat back frame 1 so as to be rotatable in the front-rear direction. 5a is slidably inserted and held in the vertical direction.

  The stay holder 7 includes a metal cylindrical holder base 8 in which a cylindrical bracket 8a is fitted in a predetermined position on the upper side 3a of the upper frame 3 so as to be rotatable in the front-rear direction. A cylindrical holder main body 9 made of a resin material having a flange portion 9a and a locking snap portion 9b formed at the lower end thereof. The holder main body 10 is press-fitted from above the holder base 8, and the snap portion 10b is held in the holder. The base 8 is assembled by being passed through and locked to the lower edge thereof.

  Further, a lock tooth 11 made of a metal square bar material is joined and disposed across both side portions 3b joined to the upper ends of the left and right side frames 2 of the upper frame 3, and the lock tooth as shown in FIG. 11 is engaged with one of the lock grooves 6 on the front side of the both leg portions 5 a of the headrest stay 5 to define the vertical position of the headrest 4.

  Further, as shown in FIG. 2, an urging means 12 is disposed on the upper side 3a of the upper frame 3 in the vicinity of one of the stick holders 7, and the urging means 12 causes the lock groove 6 and the lock tooth to be locked. The headrest 4 is biased in the rotation direction of the stay holder 7 so that the headrest 4 engages.

  In this embodiment, a torsion coil spring 12A is used as the urging means 12, and the torsion coil spring 12A is fitted and arranged on the upper side 3a, and one end is locked to a locking claw 3a 'provided on the upper side 3a. At the same time, by engaging the other end with a locking claw 8a ′ provided on the bracket 8a of the holder base 8, the headrest 4 is pivoted to the rear of the vehicle, and the leg 5a of the headrest stay 5 is moved to the front side of the vehicle. And the lock groove 6 is engaged with the lock tooth 11.

  With the above configuration, according to the first embodiment, when the vertical position of the headrest 4 is adjusted, the headrest 4 is rotated slightly forward against the spring force of the torsion coil spring 12A as shown by an arrow a in FIG. Then, from the state where the lock groove 6 of the headrest stay 5 is engaged with the lock tooth 11 shown in FIG. 5A, the lock tooth 6 is released from the lock tooth 11 and released from the lock tooth 11 as shown in FIG. 5B. Therefore, if the headrest 4 is adjusted up and down to a required height position as shown by the arrow b in FIG. 4 and the turning force of the headrest 4 is released at that position, the headrest 4 is caused by the spring force of the torsion coil spring 12A. The rotation is restored to the original rotational direction position, and the lock groove 6 adapted to the height position is engaged with the lock tooth 11 to determine the headrest position.

  Accordingly, the occupant can adjust the position of the headrest 4 simply by moving and adjusting the headrest 4 in the vertical direction while rotating in the forward direction, and can easily perform the adjustment operation.

  Further, the torsion coil for rotating the stay holder 7 in the front-rear direction with respect to the upper side portion 3 a of the upper frame 3 and for biasing the headrest 4 in a direction in which the lock groove 6 engages with the lock tooth 11. Since it can be made a simple structure in which only the spring 12A is attached, the number of parts is small, and it can be advantageously obtained in terms of cost.

  Further, in the present embodiment, as described above, the headrest 4 is pivotally biased rearward by the torsion coil spring 12A, and the leg portion 5a of the headrest stay 5 is pushed to the front side of the vehicle to engage the lock groove 6 with the lock tooth 11. Therefore, even if a backward input acts on the headrest 4 from the occupant's head, the input in the direction in which the lock groove 6 and the lock tooth 11 mesh with each other, and the occupant's head is restrained by the headrest 4. It does not interfere with sex.

  6 to 9 show a second embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 6 shows a seat back frame and a headrest. FIG. 7 is an enlarged perspective view of a portion C in FIG. 6, FIG. 8 is a perspective view similar to FIG. 6 showing a state in which the headrest is rotated, and FIG. It is a side view which shows the engagement state of a lock tooth in (a), and the engagement part and the engagement release state of a lock tooth in (b), respectively.

  This second embodiment shows a modification of the urging means 12, and as the urging means 12, an elastic body such as a wire or a strip-shaped leaf spring that presses both side legs 5a of the headrest stay 5 toward the front of the vehicle is used. In this embodiment, an example using the wire 12B is shown.

  The wire 12B is joined and arranged in a tensioned state across the upper end portions of the left and right side frames 2 so as to elastically contact the back surfaces of both leg portions 5a of the headrest stay 5 between the stay holder 7 and the lock tooth 11 in the vertical direction. It is.

  Therefore, in the second embodiment, the leg portion 5a is pushed forward by the elastic force of the wire 12B, and the lock groove 6 is formed in front of the lock tooth 11 as shown in FIGS. 6, 7 and 9A. And the height position of the headrest 4 is defined.

  When adjusting the vertical position of the headrest 4, when the headrest 4 is rotated forward as indicated by an arrow a in FIG. 6, the wire 12B is bent backward as shown in FIG. As shown in FIG. 8, the lock groove 6 is disengaged from the lock tooth 11 to release the engagement. Therefore, if the headrest 4 is moved up and down as shown by the arrow b in FIG. By sliding and releasing the turning force of the headrest 4 at an arbitrary adjustment position, the leg 5a is pushed forward by the elastic force of the wire 12B, and the headrest 4 is rotated and restored to the original rotation direction position. Then, the lock groove 6 suitable for the adjustment height position is engaged with the lock tooth 11, and the adjustment height of the headrest 4 is determined.

  Therefore, even in the second embodiment, the same effect as in the first embodiment can be obtained.

  By the way, although the headrest device of the present invention has been described by taking the first and second embodiments as examples, it is possible to adopt various other embodiments without departing from the gist of the present invention without being limited to these embodiments. it can.

The perspective view which shows the assembly | attachment state of the seat back frame and headrest stay in 1st Embodiment of this invention. The expansion perspective view of the A section of FIG. The expansion perspective view of the B section of FIG. The perspective view similar to FIG. 1 which shows the state which rotated the headrest. The side view which shows the engagement state of an engagement part and a lock tooth in (a), and shows the engagement cancellation | release state of an engagement part and a lock tooth in (b), respectively. The perspective view which shows the assembly | attachment state of the seat back frame and headrest stay in 2nd Embodiment of this invention. The expansion perspective view of the C section of FIG. The perspective view similar to FIG. 6 which shows the state which rotated the headrest. The side view which shows the engagement state of an engagement part and a lock tooth in (a), and shows the engagement cancellation | release state of an engagement part and a lock tooth in (b), respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat back frame 2 Side frame 3 Upper frame 4 Headrest 5 Headrest stay 6 Lock groove (engagement part)
7 sticker 11 lock tooth 12 urging means

Claims (2)

A headrest stay protruding from the bottom surface of the headrest and having a plurality of engaging portions in a vertical direction;
A cylindrical sticker that is provided on the upper frame of the seat back frame so as to be pivotable in the front-rear direction, and that fits and holds the headrest stick slidably in the vertical direction;
A lock tooth that is provided on a seat back frame and engages with one of the engaging portions of the headrest stay to define a vertical position of the headrest;
An urging means for urging the headrest in the rotation direction of the sticker so that the engagement portion and the lock tooth are engaged with each other.   While the engaging portion is provided on the front side of the headrest stay and the lock tooth is provided at a position facing the engaging portion, the headrest is pivotally biased rearward by the biasing means, and the headrest stay is placed on the front side of the vehicle. The headrest device according to claim 1, wherein the headrest device is pushed out to engage the engaging portion with the lock tooth.

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