JP2003259935A - Headrest device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headrest device having a fall-out prevention mechanism so that a headrest does not fall out from a seat back. <P>SOLUTION: In the headrest device made to support a headrest stay 1 by inserting it into a cylindrical holding member 10, the inner peripheral surface of the holding member 10 (preferably a holding member on the side having no height adjusting mechanism) is provided with a lock mechanism 11 for fall- out prevention which allows the tip of a lock member 12 to freely snap in and out on the inner peripheral surface side thereof by elastic force, and the lower part of the headrest stay 1 inserted into the holding member is formed with an engaging recessed portion 2 engaging with the tip of the lock member 12. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headrest device having a mechanism for preventing the headrest from coming off from a seat back.

[0002]

2. Description of the Related Art Conventionally, a headrest device is usually attached to an automobile seat for the purpose of improving the safety of passengers. In this headrest device, the vertical position of the headrest can be moved to an arbitrary position according to the physique and taste of the passenger. Specifically, the lower portion of the headrest stay embedded in the headrest is supported by a tubular holding member provided on the seat back side, and the stay is adjusted to an arbitrary height position by a height adjusting mechanism provided on the holding member. It has a structure to stop.

However, when the vertical position of the headrest is changed, or when a force is unintentionally applied in a direction to unlock the height adjusting mechanism for some reason, the headrest may be accidentally pulled out. Was very dangerous. Also, from the viewpoint of strengthening safety standards, there is a tendency to require a mechanism to prevent the headrest from being accidentally pulled out. Therefore, it has been desired to develop a headrest device having a stay removal mechanism so that the headrest does not come off from the seat back.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a headrest device capable of reliably preventing the headrest from accidentally coming off the seat back. It was completed for the purpose.

[0005]

The present invention according to claim 1 made in order to solve the above-mentioned problems, is a headrest device in which a headrest stay is inserted into and supported by a cylindrical holding member. The retaining member is provided with a lock mechanism for preventing the retaining member from slipping out toward and away from the inner peripheral surface side by elastic force, and at the lower end portion of the headrest stay to be inserted into the retaining member, the distal end of the locking member is provided. It is characterized in that an engaging recess for engaging is formed. Further, the present invention according to claim 2 is characterized in that the holding member on the side not provided with the height adjusting mechanism is provided with a similar locking mechanism for preventing disengagement.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. The drawings show a case where the present invention is applied to a front seat of an automobile,
As shown in FIG. 12, the lower portion of the headrest stay 1 embedded in the headrest 20 is attached to the seat back 21.
It is configured so as to be inserted into and supported by the tubular holding member 10 fixed to the seat back frame 22. The above points are basically the same as those of the conventional headrest device of this type. A known height adjusting mechanism (not shown) is attached to the holding member 10, and the headrest stay 1 can be stopped at an arbitrary height by the height adjusting mechanism.

Further, according to the present invention, the retaining member 10 on the side not having the height adjusting mechanism is prevented from coming off from the inner peripheral surface of the holding member 10 by elastic force so that the tip of the lock member 12 can be retracted to the inner peripheral surface side. Locking mechanism 11 is provided, and on the other hand, a lower portion of the headrest stay 1 to be inserted into the holding member 10 is provided with an engaging recess 2 that engages with the tip of the locking member 12. The points have a characteristic structure. By providing such a lock mechanism 11, it is possible to reliably prevent the headrest stay 1 from being accidentally pulled out from the seat back 21.

The lock mechanism 1 for preventing the stay from coming off will be described below.
1 will be specifically described. First, the lock mechanism 11 of the present invention has two headrest stays on the left and right.
It is applied to the stay to which the height adjusting mechanism is not attached. An engaging recess 2 that engages with the tip of a lock member 12 to be described later is formed in the lower portion of the headrest stay 1. As shown in FIG. 3, the engaging recess 2 includes a linear or arcuate taper surface 3 whose diameter gradually decreases toward the center of the stay, and a minimum diameter portion of the taper surface 3. The headrest stay 1 is formed by a horizontal surface 4 that extends horizontally, and the horizontal surface 4 and the tip of the lock member 12 are engaged with each other.
Is configured to be prevented from coming off the seat back 21. A linear or arcuate tapered surface 5 is also formed on the lower end portion of the headrest stay 1, so that the stay can be easily inserted when assembled to the holding member 10.

1 to 2 and 4, a lock mechanism 11 is shown.
The first concrete example of is shown. The lock mechanism 11 is
A plurality of vertically elongated slits 13 are formed in a lower portion of a holding member 10 made of a synthetic resin such as polypropylene, and a claw-shaped lock member 12 that engages with the engaging recess 2 is provided on the inner peripheral surface side so as to project. Has become. Such a lock mechanism 1
1, the headrest stay 1 is inserted and supported by the holding member 10 for use as shown in FIG. 1, but in a normal use state, the slit 13 is opened and expanded by inserting the stay. The lock member 12 has a shape in which the lock member 12 is spread outward, and the stay can move freely in the vertical direction. Therefore, the height adjustment mechanism (not shown) can adjust the headrest 20 to an arbitrary height in the same manner as in the conventional case and securely fix the headrest 20 at that position. On the other hand, if the stay is pulled up indefinitely, the lock mechanism 11 operates and the upward movement of the headrest stay 1 is restricted. That is, as shown in FIG. 2, when the engagement recess 2 of the stay is pulled up to the position of the lock mechanism 11, the claw-shaped lock member 12 that has been expanded outwardly returns to its original state due to the elastic force of the resin. The claw-shaped lock member 12 is fitted into the engaging recess 2 to lock. Therefore, the stay cannot be pulled up further, and the headrest 20 never comes out of the seat back 21. In addition, since the linear or arcuate tapered surface 5 is formed at the lower end portion of the headrest stay 1, the stay can be easily inserted when the headrest stay 1 is assembled to the holding member 10.

5 to 7 show a second specific example of the lock mechanism 11. The lock mechanism 11 is a holding member 1.
A lock member 12 made of a torsion spring is insert-molded in the upper part of 0, and the tip of the torsion spring is configured to be able to freely project and retract toward the inner peripheral surface side by elastic force. In such a lock mechanism 11, as shown in FIG. 5, since the torsion spring, which is the lock member 12, is compressed and hidden in the inner peripheral surface by inserting the stay in a normal use state, The stay can move freely in the vertical direction. On the other hand, when the stay is pulled up indefinitely and the engagement recess 2 of the stay is pulled up to the position of the lock mechanism 11, as shown in FIG. 6, the torsion spring returns to its original position due to the elastic force, and the tip of the spring is pulled. The part is fitted into the engaging recess 2 and locked. Therefore, the stay cannot be pulled up further, and the headrest 20 never comes out of the seat back 21. In addition, headrest stay 1
As in the previous embodiment, a linear or arcuate tapered surface 5 is formed at the lower end of the.

8 to 10 show a third specific example of the lock mechanism 11. As shown in FIG. 10, the lock mechanism 11 includes a coil spring above the holding member 10 and a recess 2 for engaging the stay having a shape of the tip.
The lock member 12 made of a plate member corresponding to the above is insert-molded, and the lock member 12 can be freely retracted and retracted toward the inner peripheral surface side by the elastic force of the coil spring. In such a lock mechanism 11, as shown in FIG. 8, in a normal use state, the coil spring is compressed by the insertion of the stay and the lock member 12 is hidden in the inner peripheral surface. Therefore, the stay is vertically moved. It will be possible to move freely. On the other hand, when the stay is pulled up indefinitely and the engaging recessed portion 2 of the stay is pulled up to the position of the lock mechanism 11, as shown in FIG. 9, the coil spring returns to its original position by the elastic force, and the lock member 12 is released. The tip end of is fitted into the engaging recess 2 and locked. Therefore, the stay cannot be pulled up further, and the headrest 20 never comes out of the seat back 21.

FIG. 11 shows a fourth specific example of the lock mechanism 11. As shown in the drawing, the lock mechanism 11 is configured such that a lock member 12 formed of an Ω-shaped snap ring is insert-molded or fitted later on the upper portion of the holding member 10, and the Ω-shaped snap ring. The bent portion forming the open portion is configured to be able to freely project and retract toward the inner peripheral surface side by elastic force. In such a lock mechanism 11, in a normal use state, by inserting the stay, the bending portion of the Ω-shaped snap ring that is the lock member 12 is opened and expanded, and the holding member 1 is formed.
Since it is hidden in the groove of 0, the stay can move freely in the vertical direction. On the other hand, when the stay is pulled up indefinitely and the recess 2 for engagement of the stay is pulled up to the position of the lock mechanism 11, the snap ring of Ω shape returns to its original position due to the elastic force, and the tip of the snap spring is engaged. It fits into the recess 2 and is locked. Therefore, the stay cannot be pulled up further, and the headrest 20 never comes out of the seat back 21.

As described above, according to the present invention, in the headrest device in which the headrest stay 1 is inserted into and supported by the cylindrical holding member 10, the holding member 10 (preferably, the side not having the height adjusting mechanism) is provided. On the inner peripheral surface of the holding member), a locking mechanism 11 for preventing the lock member 12 from retracting to the inner peripheral surface side by elastic force is provided, and the headrest stay 1 to be inserted into the holding member is provided. An engaging recess 2 that engages with the tip of the lock member 12 is formed in the lower part, and the assembling of the headrest 20 and the adjustment of the vertical position can be performed in the same manner as in the prior art. Further, even if a force to pull the headrest 20 upward is applied, the lock member 12 of the lock mechanism 11 enters the engaging recess 2 of the headrest stay 1 and locks, so that the stay is further extended. In addition, the headrest 20 cannot be moved upward, and the headrest 20 is reliably prevented from being accidentally pulled out, so that the headrest device having excellent safety can be provided.

[0014]

As is apparent from the above description, the present invention can reliably prevent the headrest from being accidentally pulled out from the seat back. Therefore, the present invention, as a headrest device that eliminates the conventional problems, is extremely important in contributing to the development of industry.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a locked state of the headrest stay in FIG.

FIG. 3 is a front view showing an engaging recess of a headrest stay.

FIG. 4 is a perspective view showing a main part of a lock member.

FIG. 5 is a cross-sectional view of a main part showing another embodiment.

6 is a cross-sectional view showing a locked state of the headrest stay in FIG.

FIG. 7 is a plan view showing a holding member.

FIG. 8 is a cross-sectional view of a main part showing another embodiment.

9 is a cross-sectional view showing a locked state of the headrest stay in FIG.

FIG. 10 is a perspective view showing a holding member.

FIG. 11 is a perspective view of a main part showing another embodiment.

FIG. 12 is an overall perspective view showing an embodiment of the present invention.

[Explanation of symbols]

1 headrest stay 2 Engagement recess 3 taper surface 4 horizontal plane 5 Tapered surface 10 Holding member 11 Lock mechanism 12 Lock member 20 headrest

Claims (2)

[Claims] 1. A headrest device in which a headrest stay is inserted into and supported by a cylindrical holding member, and the tip of the locking member is retractable to the inner peripheral surface side by elastic force of the holding member. A headrest device, comprising: a lock mechanism for prevention; and a recess for engaging with a tip of the lock member formed at a lower portion of a headrest stay to be inserted into the holding member. 2. In a headrest device in which a headrest stay is inserted into and supported by a cylindrical holding member, the tip end of the lock member is moved to the inner circumference by elastic force of the holding member on the side not having the height adjusting mechanism. A locking mechanism for preventing slipping out is provided on the surface side, and an engaging recess for engaging the tip of the locking member is formed in the lower portion of the headrest stay inserted into the holding member. Headrest device.