JPH0550928B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) This invention relates to a headrest longitudinal adjustment device for an automobile seat.

(Prior Art) Conventionally, the headrest installed on the upper part of the seat back of an automobile can be adjusted according to the seating posture of the driver. Publication No. 59-40630 and Utility Model Application No. 57-52863
No. 2 is known.

(Problems to be Solved by the Invention) In the former adjustment means of the headrest longitudinal adjustment device described above, a rotary operation dial is provided on the side of the headrest, and by rotating the operation dial, the headrest can be adjusted longitudinally. It is a rotating type that aims to. In this rotating type, the diameter of the operating dial needs to be relatively large to facilitate rotational operation. Therefore, the outward protrusion is large and may become an obstacle, and since forward and backward adjustments are made by rotating the operation dial, quick adjustment cannot be expected, and an operation dial and lock mechanism are required. To become
There is a problem that the cost becomes high.

In the latter adjustment means, adjustment is achieved by engaging the claw member with the ratchet, but the engagement between the claw member and the ratchet is released at the final tilting position of the headrest. Therefore, when adjusting the headrest, especially when adjusting the headrest rearward, first rotate the headrest to the forwardmost tilted position, then rotate it back to the rearmost tilted position, and then adjust it. Adjustment work, such as the need to move it to a different position, is cumbersome, which is undesirable in terms of operability.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an apparatus for adjusting the headrest of an automobile seat back and forth, which allows the operation part to be kept small and is also favorable in terms of operability.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a seat in which a headrest is provided on a seat bag, in which a support member supported on the seat bag side and provided in the headrest main body is provided with a headrest main body. A bracket fixed to the side is pivotally mounted so as to be rotatable back and forth, and engaging teeth are engaged with either the bracket or the support member, and engagement teeth are engaged with the engaging teeth urged by a biasing means on the other side. an engaging body that is movable at a position where the engaging body is disengaged from the engaging teeth and a position where the engaging body is disengaged from the engaging teeth; a pressing member that moves the engaging body to a position where the engaging body is disengaged from the engaging teeth when sliding due to pressure; and an operation for sliding the pressing member. A pressing portion for use is slidably provided on the rotational axis of the headrest main body.

(Function) In such a head restraint longitudinal adjustment device, no matter where the engaging body and the engaging teeth are in the meshing position, by pressing the pressing part with a finger, the engaging body is released from the engaging teeth, and a restraint release state is obtained. become.

Therefore, the headrest body can be adjusted back and forth. In this case, since the pressing part only needs to have an area that can be pressed with a finger, the shape can be small and there is no risk of the pressing part protruding outwardly, resulting in cost reduction.

Furthermore, the headrest main body can be adjusted back and forth by pressing the pressing portion, and the position of the pressing portion does not change when the headrest is rotated, improving operability.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings of FIGS. 1 to 7.

In FIG. 3, reference numeral 1 indicates a seat back of the seat, and a headrest 3 is provided on the upper part of the seat back 1.

Inside the headrest body 5 of the headrest 3,
A pair of left and right holding members 7, 7 that serve as the main frame
and the holding member 7 except for the lower end area.
A holding cover 9 is fixed to connect the holding members 7, and brackets 11, 13 are fixed to each holding member 7, 7.

Both side walls 17 and 19 of a support member 15 formed in a U-shape are rotatably supported by pivots 21 and 21 on the brackets 11 and 13, respectively. The support member 15 is fixed to struts 23, 23 extending upward from the seat bag 1, and the other end of a return spring 25, which has one end locked to the holding cover 9, is locked. As a result, the headrest main body 5 is always urged to rotate rearward (clockwise) about the rotational axis W.

A rotation axis W is provided on one side wall 19 of the support member 15.
A guide groove 27 formed in an arc shape with the center at the center is provided, and engagement teeth 29 formed in a sawtooth shape are fixed below the guide groove 27 to be free toward the front and engageable toward the rear. has been done.

An engaging body 31 that removably engages with the engaging teeth 29 is pivotally attached to the bracket 13 by a guide shaft 33, and the guide shaft 33 is slidably engaged with the guide groove 27.

The engaging body 31 has a claw portion 3 that engages with the engaging teeth 29.
5 and a stopper arm 37, the stopper arm 37 has a window hole 3 provided in the bracket 13.
9 and a protrusion 43 of the actuating arm 41 which will be described later.
is in light contact with the The claw portion 35 of the engagement body 31 is biased by a first biasing spring 45 into a state in which it engages with the engagement tooth 29 and a state in which it separates from the engagement tooth 29.

That is, when the first biasing spring 45 is in the biasing position facing rearward from the axis a passing through the guide shaft 33 as shown in FIG.
9 and is biased to mesh. Also, the 6th
As shown in the figure, when the first biasing spring 45 is in the bias release position facing forward beyond the axis a, the engaging body 3
The first claw portion 35 is biased away from the engaging teeth 29, and the first biasing spring 45 in the bias release position causes the claw portion 35 of the engaging body 31 to move away from the back of the support member 15 as shown in FIG. By coming into contact with the release portion 15b formed on the wall 15a, it is possible to return to the original position, that is, the biased position. As a result, the claw portion 35 comes to mesh with the engagement tooth 29.

Note that one end of the first biasing spring 45 is connected to the engaging body 31.
The other end is secured to the mounting portion 47 of the bracket 13, and the other end is secured to the mounting portion 13a of the bracket 13, respectively.

On the other hand, the actuating arm 41 is rotatably supported on the bracket 13 with an arm shaft 49 as a fulcrum.
It is biased counterclockwise by a biasing spring 51 . This allows the actuating arm 4 to
The first protrusion 43 is held in a standby state in which it lightly contacts the stopper arm 37 of the engaging body 31. Note that one end of the second biasing spring 51 is secured to a mounting portion 53 of the actuating arm 41, and the other end is secured to a mounting portion 13b of the bracket 13.

The tip 57a of the pressing member 57 formed in the shape of a strip is in light contact with the receiving surface 55 of the actuating arm 41, and the projection 43 of the actuating arm 41 is pressed by the receiving surface 55 (arrow in FIG. 4). , the engaging body 31 is rotated counterclockwise to the state shown in FIG. 6 by pushing down the stopper arm 37 so that the claw portion 35 is separated from the engaging teeth 29.

The pressing portion 59 of the pressing member 57 projects outward from the headrest main body 5, and the main body portion of the pressing member 57 is slidable by a bearing member 61 provided on an axis that is the rotation axis W of the bracket 13. Supported. Thereby, the position of the pressing portion 59 does not change when the headrest main body 5 rotates.

The operation of the headrest longitudinal adjustment device configured as described above will be explained. First, the fifth
In the state shown in the figure, the pressing portion 59 of the pressing member 57 is pressed with a finger. The protruding portion 43 of the actuating arm 41, which receives the pressing force on the receiving surface 55, rotates downward and clockwise about the arm shaft 49 as a fulcrum, and pushes down the stopper arm 37 of the engaging body 31.

As a result, the engaging body 31 rotates counterclockwise about the guide shaft 33, and the claw portion 35 rotates between the engaging teeth 2.
Stay away from 9. When the claw portion 35 separates from the engagement tooth 29, the first biasing spring 45 moves to the bias release position and urges and holds the claw portion 35 in the separated position, as shown in FIG. At the same time, return spring 2
5, the headrest main body 5 is rotated to the final rearward tilted position as shown in FIG.
The claw portion 35 comes into contact with b. As a result, the first biasing spring 45 moves to the biasing position, and the claw portion 35 enters an engaged state in which it is free to rotate forward with respect to the engagement tooth 29. Therefore, the headrest 3 can be adjusted by rotating the headrest main body 5 forward to a desired position. In this case, when readjusting, by pressing the pressing portion 59, it becomes possible to rotate forward and backward from that position, so that quick adjustment can be performed.

Further, since the pressing portion 59 is pressed with a finger, the area thereof is small and the pressing portion 59 does not protrude outwardly.

In this embodiment, when the first biasing spring 45 is in the bias release position, a means is employed to hold the claw portion 35 of the engagement body 31 in a state away from the engagement teeth 29. However, the claw portion 35 may be of a biasing type in which it constantly engages with the engagement teeth 29. In this case, by rotating the headrest main body 5 back and forth while pressing the pressing part 59 and releasing the pressing part 59, the claw part 35 can be meshed with the engagement teeth 29 at the desired position. .

〔Effect of the invention〕

As described above, according to the headrest front and back adjustment device of the present invention, the operation only requires pressing the pressing part, and the operating position of the pressing part is
Since it is always set in one place without changing, it is extremely easy to operate. Moreover, since it is a pressing type, it is possible to keep the pressing part small, and it does not give a protruding feeling.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the headrest longitudinal adjustment device of the present invention, Fig. 2 is an exploded perspective view of the same as above, Fig. 3 is a schematic perspective view of a seat back with a headrest provided, and Fig. 4 is a view of the right side of the headrest. The schematic cutaway front view, FIG. 5, FIG. 6, and FIG. 7 are operation explanatory diagrams showing the relationship between the engaging body and the engaging teeth. 1... Seat bag, 3... Headrest, 5... Headrest body, 11, 13... Bracket, 15
...Support member, 29...Engagement tooth, 31...Engagement body, 45
...first biasing spring (biasing means), 57...pressing member,
59...Press section.

Claims (1)

[Claims] 1. In a seat in which a headrest is provided on the seatback, a bracket fixed to the headrest main body side is pivotally attached to a support member supported on the seatback side and provided in the headrest main body side so as to be rotatable back and forth, and the bracket or support One of the members is provided with an engaging tooth, and the other is provided with an engaging body that is movable between a position where it is urged by a biasing means and engages with the engaging tooth and a position where it disengages from the engaging tooth. A pressing member for moving the engaging body to a position where it is disengaged from the engaging teeth when sliding, and a pressing part for operating the pressing member to slide are slidably provided on the rotational axis of the headrest main body. Features: Automobile seat headrest longitudinal adjustment device.