JPH018213Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a headrest that is attached to a car seat.

Headrests are widely used to prevent occupants from suffering whiplash due to collisions, etc., and to stabilize the head position. This headrest is usually adjustable in its position in the vertical direction, but recently there has been a demand for a device that can also be adjusted in its position in the front and rear directions. The present applicant has already used a ratchet having a plurality of locking teeth and a pawl that engages and disengages from the locking teeth of this ratchet as a headrest that can be adjusted in the front-rear direction, and maintains the front-rear position by meshing the two. proposed a device that did the following (Utility Application No. 128427/1984, Application No. 115265/1983).
issue). However, in this headrest, since the sound produced when the pawl engages with each of the locking teeth of the ratchet is constant, the position of the pillow, particularly the foremost position of the pillow, cannot be detected, and improvements in this respect have been desired.

This invention was based on the idea of detecting the frontmost position of the pillow by changing the operating force.
A movable bracket supporting a pillow member is supported movably in the front and back direction on a fixed bracket supported on the seat back side, and a plurality of locking teeth are provided on either the fixed side or the movable side bracket. A ratchet having a movable bracket is fixed, and a pole is rotatable and fixed on the other hand. In the head rest biased toward the locking tooth side, between the stationary side bracket and the movable side bracket, the movable side bracket is connected to the movable side bracket near the frontmost locking end of the movable side bracket by the ratchet and the pawl. The present invention is characterized in that it is provided with a resistance applying means that applies a resistance to forward movement that is greater than the movement range of .

The invention will now be described with reference to the illustrated embodiments. The pillow body (not shown) includes a pair of left and right moving brackets 11 and 12 that are spaced apart, and a support shaft 13 that connects the upper and lower sides of the moving brackets 11 and 12.
and is integrally held by the pivot shaft 14. Two stays 15 and 16 held at the top of the seat bag
The upper end is integrated by a bending connection part 17, and on the left side of this bending connection part 17 in FIG. A fixed side bracket 24 consisting of a mounting member 22 and a ratchet support plate 23 is
Each is fixed. And this mounting member 1
Through holes 25 and 26 are bored through holes 9 and 22, respectively, through which the pivot shaft 14 is rotatably inserted. It is designed so that it can be moved to change its front and back position. Spring seat 20
A tension spring 27 tensioned between the movable bracket 12 and the movable bracket 12 urges the movable brackets 11, 12, that is, the pillow body, to rotate rearward.

Ratchet support plate 23 of fixed side bracket 24
A pawl 31 is rotatably supported by a shaft 30, and the movable bracket 11 has locking teeth 33 (a) that engage with and disengage from the locking claws 32 of the pawl 31.
A ratchet plate 34 is fixed having the following elements. The toggle spring 35 biases the pawl 31 in the direction in which the locking pawl 32 engages with the locking tooth 33 when the pawl 31 is in the state shown in FIG.
When it is rotated counterclockwise by a certain angle or more from the state shown in the figure, the biasing direction is reversed. In addition, the locking claw 32 and the locking teeth 33 do not disengage even if the pillow body is pressed backward in the engaged state, but when the pillow body is pressed forward, the locking teeth 33 engage the locking claws It is formed in a shape that can overcome the 36 is in the forwardmost position of the pillow body where the locking pawl 32 of the pawl 31 is engaged with the rearmost locking tooth 33e, and when the pillow body is further pressed forward, it engages with the pawl 31 and moves it to the second position. Figure: Hook for rotating counterclockwise, 37
On the contrary, when the pillow body is moved from the front position to the rear end, it is a hook that engages with the pawl 31 and rotates it clockwise.
It is constructed as a cut-and-raised piece. A stopper 38 is provided on the ratchet support plate 23 to restrict the rotation end of the pawl 31 in the counterclockwise direction.

Therefore, the present invention attempts to notify the operator of the movement position by increasing the operating force when the pillow body reaches the vicinity of the forwardmost position. For this reason, the movable side bracket 11 has the ability to move the pillow body further forward from when the pillow body is at the forwardmost locking position, that is, from a state where the rearmost locking tooth 33e and the locking pawl 32 of the pawl 31 are engaged. An elastic member 40 is supported, which comes into contact with a part of the pole 31, a contact surface 31T on the right side of the shaft 30 in FIG. 2, when the pole 31 is moved. FIG. 3 shows an example of the structure of this elastic member 40, and FIG. 3A shows a structure in which the pole 31 is placed in the holding cylinder 42 of the rubber guide 41 which is fixed to the back surface of the movable bracket 11 by welding or other means. A rod-shaped rubber 43 that can come into contact with the contact surface 31T is inserted and supported, B is a structure in which a compression spring 46 is similarly inserted into the holding cylinder 45 of a spring guide 44, and C is a structure in which a compression spring 46 is inserted and supported in the movable side bracket 11. Spring support plate 4
A rubber piece 49 is attached to the support hole 48 of No. 7.

In this device having the above structure, the rearmost position of the pillow is when the frontmost locking teeth 33a and the locking claws 32 of the pawl 31 are engaged with each other, as shown in FIG. When the pillow body is pushed forward from this state as shown by arrow B, the locking pawl 32 rides over the locking teeth 33a, changing the meshing teeth to locking teeth 33b, 33c, 33d, and 33e. If the force in the direction of arrow B is released in this partially engaged state, the pillow body will be held in that state.

Then, when the pillow body is further pushed forward at the frontmost position where the locking pawl 32 engages with the locking teeth 33e, the elastic body of the elastic member 40 (rod-shaped rubber 43, compression spring 46
Or the rubber piece 49) is the contact surface 31T of the pole 31.
The elastic body deforms. This increases the resistance when moving the pillow body. That is, the movement resistance at the frontmost position is greater than that at other movement sections. Therefore, the operator can know that the pillow body is in the forwardmost position. This recognition allows the operator to choose whether to stop pushing the pillow body forward or to push it further to return it to the rear position.

The return operation of the pillow body will be explained. When the pillow body is pushed further forward from the above state, the hook 36 moves to the pole 3.
1 and rotate it counterclockwise. Then, the urging direction of the toggle spring 35, which had been urging the pole 31 to rotate clockwise, is reversed, and the locking pawl 32 and the locking tooth 33 are disengaged, so that the pillow body is moved by the force of the tension spring 27. rotates in the direction shown by arrow C and returns to the rear position. And when you return,
Just before reaching the return end, the hook 37 engages with the pawl 31 and the toggle spring 35 causes the pawl 3 to
In order to reverse the rotation urging direction of 1, the state shown in FIG. 2 is restored.

In the above embodiment, when the pillow body is further pressed forward while it is locked at the frontmost locking position, the resistance increases.
The resistance may be increased immediately after being locked at the frontmost locking position. Furthermore, although the resistance imparting means in the above embodiment utilizes the pole 31, it is clear that a special abutment member for the elastic member 40 may be provided. In short, the resistance applying means may be provided between the movable brackets 11, 12 and the fixed brackets 21, 24.

Further, in the above embodiment, the present invention is applied to a headrest in which the pillow body rotates and changes its position back and forth, but the present invention is also applicable to a headrest in which the pillow body moves straight and changes its position back and forth. can do.

As described above, according to the headrest of the present invention,
When the movable bracket that supports the pillow reaches the frontmost locking end, the operating force becomes heavier, making it easier to detect when the pillow has reached the frontmost position, improving operability. do.

[Brief explanation of the drawing]

Figure 1 is a front view showing an embodiment of the headrest of the present invention, Figure 2 is a right side view of Figure 1, Figure 3A,
B and C are front views respectively showing examples of the resistance imparting means of the present invention. 11, 12... Moving side bracket, 14... Pivoting shaft, 21, 24... Fixed side bracket, 31...
...Pole, 32...Latching claw, 33...Latching tooth, 3
4... Ratchet, 35... Toggle spring, 40...
...Elastic member, 43... Rod-shaped rubber, 46... Compression spring, 49... Rubber piece.

Claims (1)

[Claims for Utility Model Registration] (1) A movable bracket supporting a pillow member is movably supported in the front-rear direction on a fixed bracket supported on the seat back side, and either the fixed bracket or the movable bracket On one side, a ratchet having multiple stages of locking teeth is fixed, and on the other side, as the movable side bracket moves forward, it engages with any of the locking teeth of the ratchet to move the movable side bracket to its position. In a headrest provided with a pole that is held in the meshing position so as to be rotatable and biased toward the locking tooth side, the frontmost engagement of the movable bracket by the ratchet and the pawl is provided between the fixed bracket and the movable bracket. A headrest characterized in that a resistance imparting means is provided near the toe for imparting greater forward movement resistance to the movable bracket than in other moving sections. (2) In claim 1 of the utility model registration claim, the resistance imparting means is a pole and a head rest that is an elastic member that deforms by contacting the pole as the movable member moves forward.