JPH0239398Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a headrest longitudinal position adjustment mechanism, and more particularly to a headrest longitudinal position adjustment mechanism suitable for a so-called perforated headrest, in which the center portion of the headrest is hollowed out in the longitudinal direction.

Recently, as shown in FIG. 1, a headrest with a hole cut out in the center of the headrest has been developed. This perforated headrest has less internal space. However, the conventionally used longitudinal position adjustment mechanism has the disadvantage that it cannot be applied to the perforated head rest because it requires a large amount of space for accommodating the movable member.

The purpose of the present invention is to provide a mechanism for adjusting the longitudinal position of a headrest that can be installed in an extremely narrow space, such as from the bottom of the perforated headrest to the position of the hole, and that is simple in structure and operation. The details will be explained with reference to the drawings.

FIGS. 1 to 4 each schematically show an embodiment of the present invention, including a stay 1 having an approximately inverted U shape and a stay 1 that is swingable in the front and rear directions with respect to a horizontal member 1c. It has a headrest frame 2.
This headrest frame 2 is formed into a frame shape with a trapezoidal hole 2a formed in the center when viewed from the front, and a pad material and a skin material are attached to this headrest frame 2 to form a hole having a hole 4. A head rest 3 is formed.

As shown in FIGS. 2 and 3, the stay 1 has vertical members 1a, 1b and a horizontal member 1c, which are inserted into a sea bag frame (not shown), and a horizontal member 1c has an outer periphery in the middle of the horizontal member 1c in the axial direction. External teeth 6 as locking uneven portions are formed so as to protrude from the outer circumferential surface of the horizontal member 1c.

A movable frame 7 is fixed to the lower part of the head rest frame 2, and this movable frame 7 is attached to the stay 1.
By swinging back and forth with respect to the horizontal member 1c, the headrest 3 can swing back and forth.

That is, the movable frame 7 is formed into a flat U-shape from a horizontal portion 7a at the center and both side portions 7b formed by bending both ends of the horizontal portion 7a. A long through hole 8 is bored in the front and back direction, and the stay 1 is inserted into the pair of through holes 8.
vertical members 1a and 1b are inserted, respectively. Further, a guide member 9 is provided on the horizontal portion 7a of the movable frame 7.
is fixed, and this guide member 9 engages with a flange 10 fixed to the horizontal member 1c of the stay 1, thereby regulating the movement of the movable frame 7 in the left-right direction and guiding an operating member 14, which will be described later. It is done like this.

A lock plate 11 is normally fitted into external teeth 6 as locking uneven portions formed on the horizontal member 1c of the stay 1. This lock plate 11 is provided with a through hole 13 having internal teeth 12 as a locking uneven portion in the center thereof. Further, the lower end of the lock plate 11 is guided by the horizontal portion 7a of the movable frame 7 so as to be movable in the left and right direction.

One end of an operating member 14 is fixed to the upper part of the lock plate 11. This operating member 14 extends along the longitudinal direction of the horizontal member 1c of the stay 1, and the other end of the operating member 14 is connected to one side portion 7 of the movable frame 7.
is slidably supported in a through hole 16 formed in b,
Moreover, it protrudes to the outside of one side 7b of the movable frame 7. The load from the headrest frame 2 is applied to the operating member 14 and one side 7 of the movable frame 7.
The load applied to the operating member 14 is applied to the operating member 14 through the engagement portion with the through hole 16 formed in the lock plate 11, and the load is applied to the horizontal member 1c of the stay 1 via the internal teeth 12 of the lock plate 11. is transmitted to the external teeth 6. Note that since a torsional force acts in the longitudinal direction of the operating member 14, the operating member 14 is formed to have a large thickness and width, and has greater strength than a normal operating member. A spring member 17 is provided between the operating member 14 and one side 7b of the movable frame 7.
is provided, and the internal teeth 12 of the lock plate 11 mesh with the external teeth 6 formed on the horizontal member 1c of the stay 1, so that rotation of the headrest frame 2 is restricted. Reference numeral 18 is a flange, which maintains the locked state between the external teeth 6 and the internal teeth 12 when the lock plate 11 is biased by the spring material 17, and restricts the movement of the lock plate 11. .

In the headrest longitudinal position adjustment mechanism of the above embodiment, when the operating member 14 is pressed in the direction of the arrow a in FIGS. The lock plate 11 moves in the same direction, and the external teeth 6 formed on the horizontal member 1c of the stay 1 and the lock plate 1
The lock plate 11, operating member 14, and movable frame 7 can freely swing back and forth relative to the horizontal member 1c of the stay 1. The movable frame 7 moves back and forth within the range of the through hole 8 which is long in the front and back direction. Therefore, when the headrest 3 is pushed forward or backward, the relative position of the movable frame 2 with respect to the stay 1 is adjusted, and the operating member 14 is released, the lock plate 1 is moved by the biasing force of the spring material 17.
1 internal teeth 12 and external teeth 6 of the horizontal member 1c of the stay 1
are engaged, resulting in a locked state, and the headrest 3 consisting of the movable frame 7, headrest frame 2, etc. is fixed at the adjusted position.

In the present invention, the lock plate 11 and the horizontal member 1c of the stay 1 are connected by meshing the internal teeth 12 and the external teeth 6.
Although configured to lock, it is not limited to the internal teeth 12 and the external teeth 6, and any uneven portions that can engage with each other may be used.

FIG. 5 shows a different embodiment of the present invention, and the same reference numerals are given to parts corresponding to those of the above-mentioned embodiment, and further detailed explanation thereof will be omitted. 2 with one end connected
The two operating members 14 are connected to the lock plate 11, and the vertical members 1a and 1b of the stay 1 are located outside the movable frame 7, and the horizontal part 7a of the movable frame 7 is connected to the lock plate 11. The above-mentioned embodiment is different from the one described above, except that the spring material 17 disposed between the operating member 14 and the movable frame 7 is formed so that it does not penetrate through the operating member 14, and the spring member 17 is formed so as to be inserted through each of the two operating members 14. The structure and operation are similar to those in the example.

The above is the configuration of one embodiment of the headrest longitudinal position adjustment mechanism according to the present invention. According to such a configuration, the headrest does not become bulky in the height direction, and can be arranged in a long and narrow manner at the bottom of the headrest in the width direction. The overall structure is extremely simple and assembly work is easy, and it has the advantage of being suitable for use in perforated headrests, etc. that require little storage space.

[Brief explanation of the drawing]

1 to 4 each schematically show an embodiment of the headrest longitudinal position adjustment mechanism according to the present invention. FIG. 1 is a perspective view of the headrest, and FIG. 2 is a front view showing the headrest frame structure. Figure, 3rd
4 are a perspective view and a side view of a main part of the longitudinal position adjustment mechanism, and FIG. 5 is a perspective view of a main part showing a different embodiment of the present invention. In the figure, 1...stay, 1a, 1b...vertical member of the stay, 1c...horizontal member of the stay, 2...head rest frame, 3...head rest, 6...
... External teeth as uneven parts for locking, 7... Movable frame, 11... Lock plate, 12... Internal teeth as uneven parts for locking, 14... Operation member,
17...Spring material.

Claims (1)

[Scope of utility model registration request] In a headrest stay longitudinal position adjustment mechanism having a stay formed in a substantially inverted U-shape and a headrest frame attached to be swingable in the front-rear direction about the horizontal member of the stay, the horizontal member of the stay A locking uneven part is formed on a part of the outer periphery of the horizontal member so as to protrude from the outer periphery of the horizontal member, and a movable frame that can swing back and forth with respect to the stay is fixed to the lower part of the headrest frame. The movable frame has a central horizontal portion and both side portions bent at both ends of the horizontal portion, and is movable along the longitudinal direction of the horizontal member of the stay, and is movable along the uneven portion of the horizontal member of the stay. A lock plate having a through hole with a concave and convex portion formed along the inner circumferential surface for a lock that can normally be engaged is fitted into the horizontal member of the stay, and the lower end of the lock plate is connected to the horizontal part of the movable frame. The operating member is formed to be guided and movable in the left and right direction, one end of the operating member is fixed to the upper part of the lock plate, and the other end of the operating member is slidable into a through hole formed in one side of the movable frame. supported and formed to protrude outside one side of the movable frame so that the operating member receives the load from the head rest frame;
The operating member is biased by a spring member in a direction in which the concavo-convex portion of the horizontal member of the stay and the concave-convex portion of the lock plate engage with each other, and the operating member is urged against the bias of the spring member to move the horizontal member. The lock plate and the operating member, together with the movable frame of the headrest frame, swing relative to the horizontal part of the stay by moving the lock plate and the operating member along the movable frame of the headrest frame to release the locked state between the uneven part of the lock plate and the uneven part of the horizontal member. A mechanism for adjusting the front and back position of the headrest.