JPH11198703A - Head rest support - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an assembly workability. SOLUTION: In a head rest support for inserting a head rest stay, a lock piece 32 engaged and retreated from the side direction for the height adjusting groove formed on this head rest stay in order to realize at least the height adjustment is pressed to a resin arm 33 formed thereinside and push-pressed to the head rest stay, while being inserted in the lock piece holding hole 3b of a cylinder 31. Thereby, the number, of parts can be reduced and its assembly workability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headrest support for supporting a headrest at an upper end of a seat back.

[0002]

2. Description of the Related Art A headrest support of this type is conventionally known as shown in FIG.

The headrest stay 1 is a rod-like body projecting from the bottom surface of the headrest supported above the seat back, and has a wedge-shaped height adjusting groove 1a formed on the side surface. The headrest support 2 is formed in a tubular shape through which the headrest stay 1 can be inserted, and is accommodated and supported in a square pipe receiving tube (not shown) welded and fixed to a seat back frame. 3 is provided with a metal lock plate 4 which is inserted in a portion near the upper end in a direction orthogonal to the headrest stay 1. The lock plate 4 has an elongated through hole 4a formed so as not to hinder the insertion of the headrest stay 1, and has a push operation portion 4b integrally formed of resin at one end. . Here, the cylindrical portion 3 is provided with springs 5 and 5 which urge the push-in operation portion 4b so as to abut against the push-in operation portion 4b, and prevent the lock plate 4 from coming off against the reaction force. For this purpose, the retaining pin 6 is inserted from above the cylindrical portion 3 in a direction orthogonal to the insertion direction. Of course, the lock plate 4 is formed with a slit 4c through which the retaining pin 6 is inserted, and the retaining pin 6 and the slit 4c are formed.
Thus, the movable range of the lock plate 4 is regulated.

The movable range of the lock plate 4 is such that when the lock plate 4 is pushed in against the springs 5, 5, the headrest stay 1 and the lock plate 4
When the lock plate 4 is pushed out by the springs 5 and 5, the edge of the through hole 4a slightly interferes with the headrest stay 1. That is, the lock plate 4 is in a positional relationship where it normally interferes with the headrest stay 1 when it is stable, engages with the height adjusting groove 1a, and when the pushing operation is performed by the pushing operation section 4b, the engaged state is released and the headrest stay is released. 1 can be moved up and down.

[0005]

In the above-described conventional headrest support, assembling work such as using springs 5 and 5 for urging the lock plate 4 and inserting the retaining pin 6 is required. There was a problem that the properties were not good.

[0006] The present invention has been made in view of the above problems, and has as its object to provide a headrest support capable of improving the workability of assembly.

[0007]

In order to achieve the above object, the invention according to claim 1 comprises a cylindrical portion for inserting and holding a headrest stay having a height adjusting groove on a side surface, and a height adjusting groove. A lock piece capable of engaging and retracting with respect to the headrest support made of resin for supporting the headrest at the upper end of the seat back, wherein the cylindrical portion exposes the stay side surface and moves the lock piece in the axial direction. A lock piece holding hole that holds the lock piece forward and backward with respect to the stay while holding the lock piece immovably.The lock piece is formed so as to go around the stay from the opening side in the lock piece holding hole. A lock claw that engages with the height adjustment groove when pressed against the same stay on the opposite side; and the lock piece is pressed against the stay on the lock claw side in the lock piece holding hole. It is constituted with a resin spring mechanism that.

According to the first aspect of the present invention, in supporting the headrest at the upper end of the seat back, the headrest stay having the height adjustment groove formed on the side face is inserted into and held in the cylindrical portion of the headrest support. In addition, the lock piece is supported so as to be able to engage and retract with respect to the height adjustment groove. In this case,
A lock piece holding hole that exposes the stay side surface is formed, and by inserting the lock piece into the lock holding hole, the lock piece becomes immovable in the axial direction,
Further, the lock piece is held so as to be able to advance and retreat with respect to the stay. On the other hand, the lock piece is formed so as to go around the stay from the opening side in the lock piece holding hole,
In the lock piece holding hole, a lock claw portion is formed on the opposite side of the lock piece holding hole. Here, a resin spring mechanism is formed in the lock piece holding hole, and the lock piece is pressed against the stay on the lock claw portion side. Therefore,
The lock pawl is pressed against the stay and engages with the height adjusting groove. Since the lock piece is supported in the lock piece holding hole so as to be able to engage with and retreat from the height adjusting groove, the engagement is released when the lock piece is pushed in from the opening side against the resin spring mechanism. . In other words, it is composed of only the cylindrical portion and the lock piece by the resin spring mechanism in the lock piece holding hole.

It is needless to say that the resin spring mechanism can adopt various configurations, and it is preferable that the resin spring mechanism is integrally formed in consideration of mold division in resin molding. As an example,
According to a second aspect of the present invention, in the headrest support according to the first aspect, the resin spring mechanism extends toward the lock piece on the back side in the insertion direction of the lock piece in the lock piece holding hole, It is configured to include a resin arm that comes into contact with the lock piece inserted into the lock piece holding hole.

According to the second aspect of the present invention, a resin arm is formed in the lock piece holding hole on the back side in the insertion direction of the lock piece, and the resin arm is inserted into the lock. Extending toward the piece, abuts the lock piece in the lock piece holding hole,
Energize in the pushing direction. Since the lock piece itself is formed so as to wrap around the stay from the opening side in the lock piece holding hole, the lock claw on the wrapped side is pressed against and engaged with the stay by pushing it out. .

If the lock piece is formed so as to go around the stay from the opening side, the lock piece does not come out by inserting the stay into the cylindrical portion. However, the operation of inserting the stay cannot be performed. For this reason, the invention according to claim 3 is the headrest support according to claim 2, wherein the resin spring mechanism engages with each other in a state where the resin arm and the lock piece are in contact with each other, and locks the lock piece. It is configured to include a return restricting mechanism for preventing the lock piece from coming out while being pushed out of the lock piece holding hole.

[0012] In the invention according to claim 3 configured as described above, the return restricting mechanism of the resin spring mechanism includes:
The resin arm and the lock piece are engaged with each other in a contact state, so that the lock piece is pushed out of the lock piece holding hole so as not to come out.

That is, the lock piece is prevented from coming out separately from the stay, and even if the lock piece is inserted without waiting for the work of inserting the stay, the return restriction mechanism is prevented from coming out.

There are various shapes that embody the resin spring mechanism and the return restricting mechanism as described above, and various types can be adopted as long as this concept is followed. As a preferred example including these, in the invention according to claim 4, in the headrest support according to claim 3, the lock piece has a substantially trapezoidal front end side in the insertion direction and a skirt portion thereof. Has a space that opens in the insertion direction, the resin arm is formed in a substantially V-shape capable of abutting against the tip of this substantially mountain-shaped lock piece, and the return restricting mechanism is provided on the side of the lock piece. An L-shaped engagement piece having a tip bent toward the inside while projecting in the insertion direction on both outer sides of the skirt portion, and a substantially V-shape when the lock piece is pressed. The distal end of the resin arm protrudes outward to enter the distal end inside portion of the engaging piece so as to be engageable.

[0015] In the invention according to claim 4 configured as described above, the front end side of the lock piece in the insertion direction is formed in a substantially trapezoidal mountain shape, and the resin arm facing this is formed in a substantially V shape. ing. Therefore, if the lock piece is pressed against the resin arm, the V-shaped resin arm is pushed open, and the resin arm acts to push back the lock piece.

On the other hand, an L-shaped engaging piece is formed on both sides of the skirt on the side of the lock piece, protruding in the insertion direction and bending the tip inward. Since the tip of the resin arm projects outward, when the lock piece is pressed, the tip of the resin arm that projects outward enters the tip inner part of the engagement piece and engages with each other. Combine. And since the engagement piece is formed so as to protrude in the insertion direction, the movement in the pushing direction is not hindered, but the movement in the opposite direction is restricted to prevent slipping. Become.

In particular, since the engagement piece sandwiches the tip opened in a substantially V shape from the outside, when the lock piece is pushed in,
The middle of the resin arm is pushed in and bent like a bow, exerting a large spring force, and the resilience is also good.

The resin spring mechanism is not limited to the above, and for example, a resin spring may be provided on the side of the lock piece, or both may be provided. Also, when the lock claw is pressed against the stay, it is sufficient that the lock claw is pressed to at least the engagement state. When the lock claw enters the height adjustment groove, no pressing force may be generated.

The lock piece can be moved in various ways as long as it is pressed by the resin spring mechanism. The invention according to claim 5 is the headrest support according to any one of claims 1 to 4, wherein The piece is formed in a substantially L-shape, is engaged and supported so as to be able to move in an arc around one end in the lock piece holding hole, and wraps around from the bent portion to the end on the opposite side of the stay, and turns around the end. In this configuration, the stay is pressed against the stay by the resin arm.

In the invention according to claim 5 configured as described above, by forming the lock piece into a substantially L-shape, one end is engaged and supported in the lock piece holding hole, thereby enabling circular movement. Occasionally, it goes around the opposite side of the stay from the bent portion to the end. Then, the resin arm comes into contact with the wrapped end, and as a result, the end is pressed against the stay. Since it is pressed on the side where it goes around, if it is pushed in from the outside against this, it will leave the stay. That is, the same applies to the rotational movement of the lock piece.

It is also important to reduce the number of separate components in order to improve the assembling workability. The invention according to claim 6 is the invention according to any one of claims 1 to 5 In the headrest support, the tubular portion and the lock piece are integrally formed so as to be mutually displaceable.

In the invention according to claim 6 configured as described above, since the cylindrical portion and the lock piece are integrally formed on the premise that they can be displaced from each other, they are formed as individual components at the work site. There is no need to prepare the same number.

Further, according to a seventh aspect of the present invention, in the headrest support according to any one of the first to sixth aspects, the tubular portion and the lock piece which are integrally formed are hinges formed in a thin shape. It is configured to be connected via a piece.

[0024] In the invention according to claim 7 configured as described above, the cylindrical portion and the lock piece that are integrally formed are connected to each other via a hinge piece formed in a thin shape, and are displaced from each other. They will not be separated without hindrance,
Further, the hinge pieces serve as hinges for realizing relative movement with each other.

[0025]

As described above, the present invention can provide a headrest support capable of reducing the number of components and improving assembly workability by employing a resin spring mechanism.

According to the second aspect of the present invention, the resin arm is formed in the lock piece holding hole.
The configuration of the lock piece side can be simplified.

Further, according to the invention according to claim 3,
Since the lock piece can be held in the lock holding hole without inserting the stay, the work of inserting only the lock piece without waiting for the work of inserting the stay can be performed.

Further, according to the invention according to claim 4,
With a simple configuration, it is possible to improve the resilience as a resin arm while increasing the spring force.

Further, according to the invention of claim 5,
It is possible to adopt a configuration that realizes a rotating motion.

Further, according to the invention of claim 6,
Parts management and the like are facilitated by integral molding.

Further, according to the invention of claim 7,
Since they are connected by the hinge pieces, displacement such as rotation can be realized with a single hinge structure, as well as ease of management for maintaining integrity.

[0032]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an example of use of a headrest support according to an embodiment of the present invention.

In FIG. 1, receiving tubes 12, 12 each consisting of a square pipe oriented in the longitudinal direction of the seat back 10 are welded at predetermined intervals to a frame 11 oriented in the width direction at the upper side of the seat back 10. The headrest stays 21, 21 which are fixed and protrude downward from the bottom surface of the headrest 20 are cylindrical resin headrest supports 30, 30 inserted and supported by the receiving cylinders 12, 12.
And the headrest supports 30, 30
And is indirectly supported by the frame 11 via.

Headrest stays 21 and 21 arranged side by side
Has a height adjustment groove 2 on its outer side surface.
1a, and a headrest support 30 on the side where the headrest stay 21 is inserted.
Is composed of a cylindrical portion 31 as a whole, and a lock piece 32 supported at the upper end thereof and engaged with the height adjusting groove 21a.

FIG. 2 is a front view of the headrest support 30, and FIG.
Is shown in a cross-sectional view as viewed from the side,
FIG. 4 shows the same cylindrical portion 3 without the lock piece 32 attached.
1 is shown by a front view.

As shown in the figure, a through hole 31a is formed in the cylindrical portion 31 so as to penetrate in the vertical direction, and a lock piece holding hole 31b for inserting the lock piece 32 from the side is formed at the upper end thereof. ing.

FIGS. 5 to 7 show the lock piece holding holes 31b.
In addition, the lock piece 32 is shown in a sectional view. The lower side on the paper is the insertion side opening of the lock piece holding hole 31b,
As shown in the figure, V-shaped resin arms 33, 33 projecting toward the opening side are formed in the back of the lock piece holding hole 31b. The resin arms 33, 33 communicate with the bottom surface of the lock piece holding hole 31b and the ceiling surface on the root side, and the distal end side can bend.

On the other hand, in the lock piece 32, a substantially trapezoidal mountain-shaped portion 32a projecting toward the space between the resin arms 33, 33 is formed on the front side in the insertion direction. , 32b are left, and further on the outside are formed engaging pieces 32c, 32c protruding forward in the insertion direction. The tips of the engagement pieces 32c, 32c are bent inward, and are substantially L-shaped. On the other hand, the resin arm 3
In contrast, the tips of 3, 33 are bent outward, and the two have a positional relationship of interfering with each other.

Therefore, the lock piece 32 is inserted into the lock piece holding hole 3.
1b, the chevron 32a is
3 and 33, and then the resin arms 33 and 3
The tip of 3 starts to enter the empty spaces 32b, 32b and, as shown in FIG. 8, interferes with the bent portions of the tips of the engagement pieces 32c, 32c to bend inward. When the lock piece 32 is further pushed in, the distal ends of the resin arms 33, 33 get over the bent portions of the engaging pieces 32c, 32c, and the bent resin arms 33, 33 return as shown in FIG. Engage. However, the lock piece 32 is engaged in the direction in which the lock piece 32 is to be returned, and there is some margin in the push-in direction. Therefore, when the lock piece 32 is further pushed in from this state, the chevron portion 32a is
Since it is pressed against 3, 33, it proceeds while bending it in an arc shape. When the two resin arms 33, 33 are bent toward the bow, a force is generated to push the lock piece 32 pressed between them outward, and if the lock piece 32 is stopped from being pushed, It is pushed back naturally by itself. When the distal ends of the resin arms 33, 33 are pushed back until the distal end bent portions of the engaging pieces 32c, 32c come into contact with each other, they act so as not to come out any more.

The lock piece 32 is formed with an elongated through hole 32d penetrating in the vertical direction so as not to hinder the insertion of the headrest stay 21. The inner edge of the through hole 32d on the front side in the insertion direction is substantially linear, and the lock piece 32 is
In the state in which it is pushed back most by 33, this linear inner edge portion is in a state of entering slightly into the through hole 31a in the cylindrical portion 31. When the lock piece 32 is pushed in against the resin arms 33, 33, the linear inner edge is completely retracted from the through hole 31 a, and
d does not overlap with the through hole 31a. This means that when the lock piece 32 is pushed in, the through hole 32d and the through hole 31a do not overlap, and the headrest stay 21 can freely move up and down.
2 is pushed back by the resin arms 33, 33, the straight inner edge portion is pressed against the side surface of the headrest stay 21, and the height adjusting groove 21a is there.
If they are located, they engage with each other and the headrest stay 2
1 will be restricted. That is, the engagement and retreat movements are the basic operations of the headrest support 30 that realizes the necessary height adjustment of the headrest. Note that this inner edge constitutes a lock claw.

Although the lock piece holding hole 31b is formed to have the same width from the end on the opening side to a certain distance, it is slightly narrower through the step at the end. The step portion also regulates the movable range of the lock piece 32 described above, and the engagement pieces 32c, 32c protruding on both sides thereof.
When the tip of the arm abuts on the same step portion, it cannot be pushed any further, so that excessive bending of the resin arms 33 can be prevented.

The engagement pieces 32c, 32c thus move back and forth along the side wall of the lock piece holding hole 31b, and therefore, their movement to the outside is restricted. On the other hand, as the lock piece 32 is inserted, the resin arm 3
The distal ends of the engaging members 3 and 33 move deeper into the empty spaces 32b and 32b, and act to push the engaging pieces 32c and 32c from the inside to the outside. However, the engagement pieces 32c,
32c is supported from the outside, so the resin arm 3
The so-called 3 and 33 are bowed with both ends supported and the middle part extruded. This acts as a two-sided spring piece, so that the spring force can be strengthened, and even if it is made of resin, the returnability can be improved.

In the present embodiment, the lock piece 32 moves straight back and forth, but the movement of the lock piece 32 is not limited to such a forward and backward movement. 10 and 11 show a lock piece 132, a lock piece holding hole 131b, and a resin arm 133 as modified examples.
The lock piece 132 is formed in a substantially L-shape as a whole, and has a column-shaped rotating end 132 that is vertically oriented at one end.
e is formed, and is rotatably supported by a bearing 131b1, which forms a cylindrical concave portion formed at the end of the side wall of the lock piece holding hole 131b. One of the bearing portions 131b1 that sandwiches the rotation end 132e so as to divide the mold is formed on the floor side lower than the center, and the other is formed on the ceiling side higher than the center.

The L-shape allows the opposite end 132f to wrap around the opposite side of the stay and further project inward to form a lock claw, such as the linear inner edge described above. Here, a resin arm 133 is formed behind the lock piece holding hole 131b so as to face the tip of the same end 132f. This resin arm 133 is substantially U
It is formed so that its open end faces the back side in the insertion direction and its closed side faces the front side in the insertion direction. Further, the floor surface and the ceiling of the lock piece holding hole 131b are formed at the open end side. It is formed so that it is connected to the surface and the closed side is separated. That is, also in this case, it is formed like a two-sided spring piece, and when the end portion 132f is pressed, a strong repulsive force is generated and the return property is improved.

When the lock piece 132 rotates about the rotation end 132e as a fulcrum, the end 13 serving as a lock claw is formed.
2f draws an arc into the lock piece holding hole 131b, and the opening end of the lock piece holding hole 131b on the side opposite to the bearing 131b1 is slightly the same end 1
It enters inside the arc drawn by 32f. Therefore, only at that portion, both interfere with each other, and the lock piece 132 is forcibly inserted. However, conversely, the lock piece 1
The lock piece 132 does not come out unless there is a great deal of trouble, and the lock piece 132 can be attached before the stay is inserted.

On the other hand, in the above example, the lock pieces 32 and 132 and the cylinder parts 31 and 131 are configured as separate bodies. However, since they are separate bodies, they must be prepared separately at the assembly work site. ,troublesome. FIG. 12 and FIG.
The lock piece 232 and the cylindrical portion 231 are connected to the thin hinge piece 23.
4 shows an example in which they are connected and integrally formed. In addition, a small projection 232g1 is formed on the outer surface of the rotation end 232g of the lock piece 232, and a small projection 231b1 is formed on the inner peripheral surface of the lock piece holding hole 231b to get over when the small projection 232g1 moves in an arc. And
Return restrictions are realized. Further, in this example, the resin arm 233 is formed to be slightly thicker while being cantilevered like the resin arm 33, so that the resilience and the resilience are improved. In the example described above, the lock pieces 32, 132, 23
2 is manufactured by resin molding. As shown in FIGS. 14 and 15, a lock plate 332 made of a metal plate as in the related art is used.
a and a push-in operation section 332b integrally formed of resin. As shown in the figure, a projection 332a1 that is wider on the distal end side is formed at the front end in the insertion direction of the lock plate 332a, and the cylindrical portion 331 is formed.
The two semi-circular spring pieces 331a, 331 abutting between the back side of the wide portion of the projection 332a1 and the front edge 332a2 of the lock plate 332a.
a is formed. FIG. 16 shows the lock piece 332 connected to the cylindrical portion 3.
Since the spring piece 331a has its convex surface abutting against the front edge 332a2 of the lock plate 332a, the spring piece 331a urges the lock piece 332 to be pushed out. Since the front end of 331a is in contact with the back side surface of the projection 332a1, it also serves as a stopper. FIG. 17 shows a state in which the lock piece 332 is pushed in, and the spring pieces 331a, 331a are deflected to receive a reaction force. During this time, the stay 21 can be moved up and down. A lid 331b is formed via a thin hinge portion so that a portion of the cylindrical portion 331 on the side opposite to the insertion direction of the lock piece 332 can be closed, so that the appearance can be improved when the user is closed.

As shown in FIGS. 2 and 3,
A pair of slits is formed on the four side surfaces of the cylindrical portion 31 at upper and lower sides, and a double-sided bridge-shaped tension spring 31c as shown in FIG. 18 is formed. Here, the tension spring 31c is formed so as to face up or inward depending on the surface to be formed, and the tension springs 31c of the surfaces facing each other are formed in the same direction. With reference to the front view shown in FIG. 2, both the front surface and the back surface are formed toward the inside, and both side surfaces are formed toward the outside.

As shown in FIG. 18, the tension spring 31
The middle of c is formed in an arc shape, and extends from both ends thereof along the peripheral wall surface of the cylindrical portion 31. Also, the thickness of the portion extending along the peripheral wall surface is gradually increased from the side close to the arc. Such a shape is intended to improve the spring force of the resin tension spring 31c and improve the resilience, and does not lose the spring property even when used for a long time.

FIG. 19 is a sectional view showing a state in which the headrest support 30 is inserted into the receiving cylinder 12. The outwardly oriented tension spring 31c abuts on the inner peripheral surface of the receiving cylinder 12 for positioning, and the inwardly oriented tension spring 31c sandwiches the outer peripheral surface of the headrest stay 21 inserted inside to play. Stop it.

In the examples shown in FIGS. 2 and 3, the tension springs 31c arranged vertically are oriented in the same direction. However, the tension springs 31c may be arranged upside down.

As described above, in the headrest support 30 into which the headrest stay 21 is inserted, in order to realize at least height adjustment, the headrest stay 21 is used.
The lock piece 32 that engages and retracts from the side with respect to the height adjustment groove 21 a formed at the same time is inserted into the lock piece holding hole 31 b of the same cylindrical portion 31 and pressed against the resin arm 33 formed inside the lock piece 32. As a result, the headrest stay 21 is pressed, so that the number of components can be reduced and the workability of assembly can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a usage example of a headrest support according to an embodiment of the present invention.

FIG. 2 is a front view of a headrest support.

FIG. 3 is a side cross-sectional view of a cylindrical portion.

FIG. 4 is a front view of a lock piece holding hole.

FIG. 5 is a cross-sectional view showing a lock piece and a structure inside a lock piece holding hole.

FIG. 6 is a cross-sectional view showing a state where a lock piece is inserted into and engaged with a lock piece holding hole.

FIG. 7 is a cross-sectional view showing a state where the lock piece is further pushed after being engaged in the lock piece holding hole.

FIG. 8 is a schematic diagram of an engagement process between a resin arm, a chevron portion of a lock piece, and an engagement portion.

FIG. 9 is a schematic view of the engagement state between the resin arm, the chevron portion of the lock piece, and the engagement portion.

FIG. 10 is a cross-sectional view illustrating a structure of a lock piece and a lock piece holding hole according to a modification.

FIG. 11 is a cross-sectional view showing a state where a lock piece is inserted into and engaged with a lock piece holding hole.

FIG. 12 is a cross-sectional view showing a structure of a lock piece and a lock piece holding hole according to a modification.

FIG. 13 is a cross-sectional view showing a state in which a lock piece is inserted into and engaged with a lock piece holding hole.

FIG. 14 is a cross-sectional view showing a structure of a lock piece and a cylinder according to a modification.

FIG. 15 is a rear view showing a state where a lock piece is inserted into and engaged with the lock piece holding hole.

FIG. 16 is a cross-sectional view showing a state in which a lock piece is inserted into and engaged with a lock piece holding hole.

FIG. 17 is a cross-sectional view showing a state where a lock piece is pushed into a lock piece holding hole.

FIG. 18 is a sectional view showing a structure of a tension spring.

FIG. 19 is a sectional view showing a state where a headrest support is inserted into a receiving cylinder.

FIG. 20 is an exploded perspective view of a conventional headrest support.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Seat back 11 ... Frame 12 ... Receiving cylinder 20 ... Headrest 21 ... Headrest stay 21a ... Height adjustment groove 30 ... Headrest support 31 ... Cylindrical part 31a ... Through hole 31b ... Lock piece holding hole 31c ... Tension spring 32 ... Lock piece 32a ... mountain-shaped part 32b ... empty space 32c ... engagement piece 32d ... through hole 33 ... resin arm 131b ... lock piece holding hole 131b1 ... bearing part 132 ... lock piece 132e ... rotating end 132f ... end part 133 ... resin arm 231 ... Cylinder part 231b ... Lock piece holding hole 231b1 ... Small projection 232 ... Lock piece 232g ... Rotating end 232g1 ... Small projection 233 ... Resin arm 234 ... Hinge piece 1 ... Head rest stay 1a ... Height adjustment groove 2 ... Head rest support 3 ... Tube part 4 ... Lock plate 4a ... Through hole 4b ... Push-in operation part 4c ... Slit 5 ... Spring 6 ... Retaining pin

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomohisa Hotake 25, Ueikeike, Yoshiwara-cho, Toyota-shi, Aichi Pref.

Claims (7)

[Claims] 1. A seat portion having a headrest stay having a height adjustment groove formed on a side surface thereof, the lock portion being capable of engaging and retracting with the height adjustment groove. A resin headrest support for supporting a headrest, wherein the cylindrical portion exposes the stay side surface to hold the lock piece immovable in the axial direction and hold the lock piece so as to be able to advance and retreat with respect to the stay. The lock piece is formed so as to go around the stay from the opening side in the lock piece holding hole, and engages with the height adjustment groove when pressed against the same stay on the opposite side. A headrest support, comprising: a lock claw portion to be pressed; and a resin spring mechanism for pressing the lock piece against the stay on the lock claw portion side in the lock piece holding hole. 2. The headrest support according to claim 1, wherein the resin spring mechanism extends toward the lock piece in the lock piece holding hole at the back side in the insertion direction of the lock piece. A headrest support, comprising: a resin arm abutting on the lock piece inserted into the piece holding hole. 3. The headrest support according to claim 2, wherein the resin spring mechanism engages with each other in a state where the resin arm and the lock piece are in contact with each other, and causes the lock piece to engage with the lock piece holding hole. A headrest support comprising a return restricting mechanism that prevents the user from slipping out while pushing it out. 4. The headrest support according to claim 3, wherein the lock piece has a substantially trapezoidal mountain shape at the front end side in the insertion direction, and a space that opens toward the insertion direction at a foot portion thereof. The resin arm is formed in a substantially V-shape capable of abutting on the tip of this substantially mountain-shaped lock piece, and the return restricting mechanism is provided on both outer sides of the skirt portion on the lock piece side. An L-shaped engagement piece having a tip bent inward while projecting in the insertion direction; and a substantially V-shaped tip of the resin arm projecting outward when the lock piece is pressed. A headrest support wherein the engagement piece is made to enter and engage with the inside of the distal end of the engagement piece. 5. The headrest support according to any one of claims 1 to 4, wherein the lock piece is formed in a substantially L-shape and is capable of circular movement about one end in the lock piece holding hole. A headrest support which is engaged with and supported by the armrest, wraps around the opposite side of the stay from the bent portion to the end, and is pressed against the stay at the wrapped end by the resin arm. 6. The headrest support according to claim 1, wherein the cylindrical portion and the lock piece are integrally formed so as to be displaceable with respect to each other. 7. The headrest support according to any one of claims 1 to 6, wherein the cylindrical portion and the lock piece which are integrally formed are connected via a hinge piece formed in a thin shape. Headrest support characterized by being.