JPH0510690Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a headrest device for an automobile, which has a headrest main body supported by a seat back of a seat so as to be rotatable through a normal use angle range.

BACKGROUND OF THE INVENTION Headrest devices of the above type for supporting the head of an occupant seated on a seat are well known. Although this device is very advantageous in terms of ensuring the safety of the occupants, on the other hand, when the seat is empty, the headrest itself becomes an obstruction, and there is a risk that it may impede the view and sense of spaciousness for those seated in other seats.

In order to expand the visibility and sense of openness behind the seat,
A headrest device that can rotate the headrest body from its normal use position to a storage position has also been proposed (Utility Model Application Publication No. 179230/1983).
Conventional devices of this type require many elements used only for the purpose of rotating the headrest main body to the storage position, which inevitably complicates the structure and increases costs.

Purpose The purpose of the present invention is to eliminate the above-mentioned conventional drawbacks, eliminate the fear that the headrest itself will obstruct the view and openness of others when the seat is empty, and achieve structural simplification and cost reduction. An object of the present invention is to provide a head restraint device for an automobile.

Configuration In order to achieve the above object, the present invention includes a headrest main body supported by the seat back of a seat so as to be rotatable in the normal use angle range between the rearmost position and the frontmost position, and a headrest main body that is rotated rearwardly. a return spring that biases the headrest toward the headrest; a ratchet provided on the headrest body side so as to rotate together with the headrest body; and a pawl pivotally supported on the seatback side so as to be swingable and engaged in a tooth groove of the ratchet. a guide portion for rotating the pawl so that the pawl of the pawl separates from the tooth groove when the headrest main body is rotated to the forwardmost position; a hook member that engages with the pawl to hold the pawl in that position when the pawl is supported and the headrest main body is rotated to the forwardmost position and the pawl of the pawl is disengaged from the tooth groove of the ratchet; and a pawl, each end of which is locked, and a regulating spring that biases the pawl to rotate in a direction in which the pawl engages the tooth groove of the ratchet, and a regulating spring is provided on the headrest main body side, and the main body is the last one. When it returns to the normal position, it comes into contact with the hook member, rotates the hook member, releases the engagement between the hook member and the pawl, and ensures that the pawl of the pawl engages with the tooth groove of the ratchet. In the head restraint device for an automobile, the head restraint body is rotatably supported by the seat bag to a storage position further rearward than the rearmost position, and the pawl of the pawl engages the tooth groove of the ratchet. An operating member for rotating the pole in a direction away from the headrest is connected to the pole, and the base end of the stopper is fixed to the headrest main body side, and the stopper has a base end fixed to the headrest main body side, and a stopper has a base end fixed to the headrest main body side, and a stopper has a base end fixed to the headrest main body side. When the hook member returns to the position, the stopper has a bent end portion that comes into contact with the hook member, and the stopper rotates the pawl by operating the operating member, disengaging the pawl from the tooth groove of the ratchet, and removing the head rest. After the main body has been rotated to its storage position, when the headrest main body is rotated again to the above-mentioned operating angle range, a leaf spring that slides into the above-mentioned hook member and is elastically deformed by the pressing action from the hook member is used. We propose a head restraint device for an automobile, characterized in that it is configured as follows.

BEST MODE FOR CARRYING OUT THE DISCLOSURE Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing the entire seat of an automobile. 1 is a seat cushion that supports the buttocks of a seated person P, 2 is a seat back that supports the back, and the seat back 2 has a headrest main body 4 on the top thereof. A headrest device 3 is located.

As shown in FIGS. 2 and 3a, the headrest main body 4 includes a protector case 5, a pad 6 covering the outside thereof, a skin 7 thereof, and a pair of support members 8 and 9 that fixedly support the protector case 5. have. This headrest main body 4 has a first
It is supported by the seat back 2 of the seat so as to be rotatable in a normal use angle range θ between the rearmost position shown by a solid line in the figure and the frontmost position shown by a chain line. The headrest main body 4 is normally used at a desired position within this angular range θ. Although the configuration related to this has been known for a long time (for example,
In order to understand the present invention, the structure and operation thereof will first be clarified.

The support members 8 and 9 are pipe shafts 30 that are thicker than the headrest shaft 10 that extends in the lateral direction of the seat.
, and the head rest shaft 10
is rotatably supported in the front and rear directions A and B of the seat,
Attachment members 11 and 12 are fixed to each end of the shaft 10. These mounting members 11 and 12 are either fixed immovably to the seat bag 2 or supported so that their height positions can be adjusted. In this way, the headrest main body 4 is rotatably supported by the seat bag 2.

The reference numeral 13 indicates a torsion coil spring wound around the shaft 10, each end of which is locked to one of the supporting members 8 and the mounting member 11, respectively. This spring 13 constitutes a return spring that urges the headrest main body 4 toward the rear B of the seat, and a tension spring or the like may be used instead of the torsion coil spring 13.

A ratchet 14 is fixed to the other support member 9, and this ratchet 14 can also rotate about the axis of the shaft 10 together with the support member 9 in the directions of arrows A and B. The ratchet 14 has tooth grooves 15, 15 along an arc centered on its rotation axis.
a, 15b, and 15c are formed. In this way, the ratchet 14 is provided on the side of the headrest main body 4 so as to rotate together with the main body.

A support bracket 16 is fixed to the shaft 10 as clearly shown in FIG.
The tooth grooves 15, 15a, 1 of the ratchet 14 are
A pole 18 equipped with a claw 17 that engages with 5b or 15c and a hook member 19 are connected to the pivot pin 2.
0 and 21 so as to be swingable. In this way, both the pawl 18 and the hook member 19 are pivotally supported toward the seat back side.

A tension spring 22 is attached to the hook member 19 and the pole 18.
are locked at each end, thereby causing the hook member 19 and the pawl 18 to engage their respective pivot pins 21, 2.
0 in the counterclockwise direction in FIG. 3a. This tension spring 22 constitutes a restriction spring that urges the pawl 18 to rotate in a direction in which the pawl 17 engages with the tooth groove of the ratchet 14.

FIG. 3a shows a state in which the headrest main body 4 occupies the rearmost position during normal use, and at this time the pawl 17 of the pawl 18 is pulled into the first tooth groove of the ratchet 14 by the action of the tension spring 22. 15. Therefore, the headrest main body 4 is biased in the clockwise direction B in FIG. 3a by the torsion coil spring 13, but the claw 17 prevents the rotation, and the main body 4 held in position.

In order to adjust the tilt position of the headrest main body 4 according to the physique and preference of the seated person, it is sufficient to manually rotate the main body 4 forward (in the direction of arrow A) against the action of the spring 13. . Due to this rotation, the ratchet 14 rotates together with the main body 4 around the axis of the shaft 10, but the pawl 18 does not rotate because it is supported by the shaft 10 on the seat back 2 side. Therefore, while the pawl 18 swings, its pawl 17 successively engages with the tooth grooves 15a, 15b, and 15c of the adjacent ratchets. At this time, when the user releases the main body 4, the claw 17 engages with one of the tooth grooves, and the main body 4 is locked in that position. In this way, the inclination position of the main body 4 can be adjusted freely, and since the number of tooth grooves is four in the illustrated example, the position of the main body 4 can be adjusted in four stages.

When the headrest main body 4 is further rotated forward (in the direction of arrow A), the pawl 18 moves to the guide portion 23 formed on the ratchet 14 as shown in FIG. 3b.
The pawl 18 rotates clockwise around the pivot pin 20, and the pawl 18 and the hook member 1
The locking portions 24 and 25 of 9 engage with each other. Once these are engaged, the engaged state is maintained by the action of the tension spring 22, and at this time the pawl 17 of the pawl 18 occupies a position away from the tooth spaces 15 to 15c of the ratchet 14.

In this way, the guide portion 23 described above guides the pole 1 when the headrest main body 4 rotates to the forwardmost position.
The hook member 19 rotates the pawl 18 so that the pawl 17 of the pawl 18 is released from the tooth groove of the ratchet 14, and the hook member 19 rotates the pawl 18 of the pawl 18 so that the headrest main body 4 rotates to the forwardmost position. When released from the tooth groove of the ratchet 14, it engages with the pawl 18 and serves to hold the pawl 18 in that position.

As mentioned above, from the ratchet 14 to the pole 18
When the pawl 17 is separated, the ratchet 14
8 is released, so if you let go of the main body 4 at this time, the main body 4 will release the torsion coil spring 13.
, it rotates rearward as shown by arrow B and returns to the rearmost position as shown in Figure 3c. At this time, the hook member 19 comes into contact with the tip 27 of the stopper 26 fixed to the support member 9 on the headrest main body side, and rotates clockwise around the pivot pin 21. Therefore, the engagement between the pawl 18 and the locking parts 24 and 25 of the hook member 19 is released, the pawl 18 is released from the restraint by the hook member 19, and its pawl 17 engages with the first tooth groove 15, and the pawl 18 is released from the restraint by the hook member 19. Return to the state shown in Figure 3a. In this way, the stopper 26 serves to allow the pawl 17 of the pawl 18 to engage with the tooth groove of the ratchet 14.

As described above, the headrest main body 4 can be held and used at a desired position within the range of the normal use angle θ (FIG. 1) according to the body of the seated person.

By the way, when no one is sitting on the seat equipped with the headrest device 3 described above, if the headrest main body 4 is in the operating position shown by the solid line and chain line in FIG. 1, it may interfere with other people. There is a possibility that it will become. Therefore, the present invention is constructed so that the headrest main body 4 can be stored in the storage position shown by the broken line in FIG. 1 when the seat is vacant. The specific configuration and operation regarding this are as follows.

First, the aforementioned headrest main body 4 is rotatably supported by the seat back 2 to a storage position further rearward than the rearmost position shown by the solid line in FIG. It is indicated by a broken line in Figure 1.

On the other hand, as shown in FIGS. 2 to 4, the end of an operating member consisting of a cable 28 (or link, etc.) is connected to the aforementioned pole 18, and the cable 28 is operated by the seated person P. In the illustrated example, the seat cushion 1 extends to the front of the seat cushion 1 as shown in FIG. 1, and a knob 29 is fixed to the tip thereof.
By pulling this knob 29 in the direction of arrow C, the headrest main body 4 can be stored in the storage position.

Assuming that the headrest main body 4 is now in the position shown in FIG. 3a, if the knob 29 is pulled in the direction of arrow C in this state, the pole 18 is pulled via the cable 28 and moves around the pivot pin 20 as shown in FIG. Rotate clockwise at point a. Therefore, as shown in FIG. 4a, the pawl 17 of the pawl 18 comes off the tooth groove 15 of the ratchet 14, and as in the case of FIG. Together with the ratchet 14, by the action of the torsion coil spring 13, it rotates further rearward (in the direction of arrow D) than the rearmost position. In this way, the cable 28 connects to the pawl 17 of the pole 18.
The pawl 18 is rotated in a direction in which the pawl 18 is separated from the tooth groove of the ratchet 14.

As the headrest main body 4 rotates as described above, the hook member 19 hits the stopper 26 as shown in FIG.
5 and 24 are disengaged, but since the pawl 18 continues to be pulled by the cable 28, its pawl 17 remains separated from the tooth groove of the ratchet 14, and the main body 4 moves in the direction of arrow D. Continue rotating. Along with this, the hook member 19 is moved to the stopper 26.
The stopper 26 further rotates clockwise around the pivot pin 21 while being pushed by the user, and the stopper 26 passes over the hook member 19. In this way, the headrest body 4
reaches the retracted position shown in FIG. 4c, at which time the support member 9 comes into contact with a stop member (not shown) provided on the side of the seat bag 2 and stops. At this time, the height H (Fig. 1) of the headrest main body 4 is significantly lower than the height h of the main body 4 in the use position, and therefore, the headrest main body 4 does not interfere with those seated on other seats. You can see your surroundings without worrying about
It gives you a pleasant feeling of freedom.

In the above explanation, the headrest main body 4 is shown in Fig. 3a.
Although the case has been described in which the main body 4 is rotated from the rearmost position of the use position to the storage position shown in FIG.

In order to return the headrest main body 4 brought to the storage position to the use position again, it is sufficient to simply rotate the main body 4 counterclockwise (in the direction of arrow E) in FIG. 4c against the action of the spring 13.

During this operation, the stopper 26 passes through the hook member 19 and returns to the use position shown in FIG. 3a, for example. As shown in FIGS. It consists of a leaf spring fixed to the side support member 9. Therefore, as described above, the pawl 18 is rotated by operating the cable 28, the pawl 17 is disengaged from the tooth groove 15 of the ratchet 14, and the headrest body 4 is rotated to its storage position, and then the headrest body 4 is rotated again. 4 to the above-mentioned operating angle range as shown by arrow E, the angles shown in FIGS.
As shown in FIG. d, the surface 26a of the stopper 26 comes into sliding contact with the hook member 19, and the stopper itself is moved by the arrow F (FIG. 5) due to the pressing action from the hook member 19.
elastically deforms in the direction. Therefore, the stopper 26 can pass through the hook member 19 without any problem and return to the state shown in FIG. 3a.

When the stopper 26 returns to the use position, the stopper 26 is released from the pressing action by the hook member 19 and returns to its natural state, as shown in FIG. Therefore, it can function as a stopper without any trouble during the operation described above with reference to FIGS. 3a to 3c. In this way, the stopper 26
has a bent end portion at its end 27, with which the hook member 19 comes into contact as described above when the headrest main body 4 returns from the forwardmost position to the rearmost position.

Effects According to the present invention, since the headrest main body can be stored at a low height, the field of view of those seated in other seats can be expanded, and it has become possible to provide a pleasant feeling of openness.

Moreover, the mechanism for rotating the headrest main body to the storage position and returning it to the normal operating angle range utilizes many elements for rotating the headrest main body within the normal operating angle range. Due to this configuration, it is possible to prevent the structure of the headrest device from becoming complicated and to suppress an increase in its cost.

Furthermore, since the headrest main body can be rotated from any use position within the normal use angle range to the retracted position and stored, it can be easily operated.

Furthermore, in order to return the headrest main body brought to the storage position to the use position again, it is sufficient to simply rotate the main body by the action of the return spring, making the operation at this time very easy. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a side view of a car seat equipped with a headrest device according to the present invention, Fig. 2 is an exploded perspective view of the headrest device, and Figs. Figures 4a to 4d are cross-sectional explanatory diagrams showing the operation when the main body is put into the storage position and conversely returned from the storage position, and Figure 5 is a cross-sectional view taken along the line -- in Figure 4d. , FIG. 6 is a sectional view similar to FIG. 5 after the stopper has passed through the hook member. 2...Seat bag, 3...Headrest device, 4...Headrest body, 13...Spring, 1
4... Ratchet, 15, 15a, 15b, 15
c...Tooth groove, 17...Claw, 18...Pole, 19
... Hook member, 22 ... Spring, 23 ... Guide part, 26 ... Stopper, 27 ... Tip, H, h ...
...height, θ...angle.

Claims (1)

[Utility Model Registration Claims] A headrest body supported on the seat back of a seat so as to be rotatable within a normal angular range of use between the rearmost position and the forwardmost position, a return spring which urges the headrest body rearward, a ratchet provided on the body side so as to rotate integrally with the headrest body, a pole which is pivotally supported on the seat back side so as to be swingable and has a pawl which engages with a tooth groove of the ratchet, a guide section which rotates the pole so that the pawl of the pole disengages from the tooth groove when the headrest body rotates to the forwardmost position, and a return spring which is pivotally supported on the seat back side so as to be swingable and has a pawl which engages with a tooth groove of the ratchet. A headrest device for an automobile comprising: a hook member which engages with the pole to hold the pole in position when the pole rotates and the pawl of the pole disengages from the tooth groove of the ratchet; a restricting spring which has each end engaged with the hook member and the pole and which urges the pole to rotate in a direction in which the pawl engages with the tooth groove of the ratchet; and a stopper which is provided on a headrest body and which comes into contact with the hook member to rotate the hook member when the body returns to its rearmost position, releasing the engagement between the hook member and the pole and allowing the pawl of the pole to engage with the tooth groove of the ratchet, a headrest body supported by a seat back so as to be rotatable to a storage position further rearward than the rearmost position, an operating member connected to the pole for rotating the pole in a direction such that the pawl of the pole disengages from the ratchet tooth groove, the stopper having a base end fixed to the headrest body and a tip having a bent portion at its tip against which the hook member abuts when the headrest body returns from the frontmost position to the rearmost position, and the stopper is in sliding contact with the hook member and is constructed of a leaf spring which is elastically deformed by the pressing action of the hook member when the pole is rotated by operating the operating member to disengage the pawl from the ratchet tooth groove and rotate the headrest body to its storage position and then rotate the headrest body back to the usage angle range.