JPH11332685A - Structure for positioning headrest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headrest positioning structure with excellent assembling workability, with a reduced number of parts. SOLUTION: The structure is provided with a support main body 1 fitted at a back rest side, a stay 21 arranged at the headrest side and a positioning means 31 locking the stay 21 inside the support main body 1. A slide hole is formed in the head part 3 of the support main body 1, a positioning groove 21a is formed at the side surface of the stay 21, and the positioning means 31 consists of an operation knob 32 and a metallic wire body 33. The metallic wire body 33 is provided with a lock part 38 engaged with the positioning groove of the stay 21, a fixing part 39 fixed to the operation knob 32 and an elastic arm part 40 energizing the positioning means 31 itself outward by repulsion. A pair of guide walls 34A and 34B extending in the direction of the metallic wire body 33 are extended at the side of the operation knob 32 of the positioning means 31 and, in the meantime, a pair of restricting walls which are abutted on the guide walls 34B and 34B and restrict the insertion attitude of the lock part 38 of the metallic wire body 33 are arranged at the both side faces of the slide hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a positioning structure for locking a headrest provided on an automobile seat back at a desired height.

[0002]

2. Description of the Related Art As shown in FIG. 10, an ordinary vehicle seat has a frame 52 disposed inside a seat back 51, and a pair of left and right square pipe brackets 53 are fixed to the frame 52. A support body 54 having an insertion hole 54a is attached to each bracket 53,
The headrest 5 is inserted into the insertion hole 54a of each support body 54.
The height position of the headrest 55 can be adjusted by slidably inserting a pair of stays 56 provided on the fifth side.

For this reason, in order to lock the headrest 55 at the adjusted desired height position, at least one of the right and left support main bodies 54 must be provided with a positioning structure. 4 and 5 of Japanese Utility Model Laid-Open No. 6-46551, for example.
Are provided.

[0004] Although the conventional positioning structure is not specifically shown, a slide horizontal hole is formed in the head of the support body at right angles to the insertion hole, and a lock hole is formed at the center of the slide horizontal hole. The formed metal lock plate having a rectangular shape is inserted, and the lock plate is elastically urged outward by the spring pressure of the two coil springs until the lock plate is restricted by the stopper pin. When pressed inward against the pressure, the stay is allowed to move up and down in the insertion hole of the support body, and when the lock plate is released, the hole edge of the lock hole of the lock plate is provided on the stay side. By engaging with one of the plurality of positioning grooves, the headrest can be locked at a desired height and positioned. The stopper pin is driven into the guide slot formed at the tip of the lock plate from the top surface side of the support body to allow the lock plate to move by the length of the guide slot. In addition, the lock plate is prevented from protruding from the slide lateral hole.

However, this conventional positioning structure requires two coil springs and stopper pins in addition to a metal lock plate as a headrest positioning means, and naturally the number of parts is reduced. Needless to say, the cost increases due to the increase.
In particular, it is necessary to mount two coil springs individually on both sides of the lock plate, or to insert a stopper pin into the guide slot of the lock plate from the upper surface of the head of the support body. There has been a major problem in that the number of attachment steps has been increased, and the assembling work has become unnecessarily complicated.

Therefore, in view of such circumstances, Japanese Utility Model Application Laid-Open No.
An improved positioning structure shown in FIGS. 1 and 2 of JP-A-6551 is proposed. The improved positioning structure has the above-mentioned rectangular lock plate formed into a substantially U-shape,
The lock plate is configured to be elastically urged outward with only one coil spring.

[0007]

Therefore, under the improved positioning structure, it is possible to temporarily omit one coil spring. However, when viewed as a whole, the number of parts is relatively small. Not only can't expect a reduction,
After all, work such as mounting the coil spring on the lock plate side and driving the stopper pin from the top of the head of the support body will still be required,
I could not expect much improvement in workability.

[0008]

SUMMARY OF THE INVENTION The present invention has been developed in order to effectively solve the problems of the conventional positioning structure, and the invention according to claim 1 has a headrest attached to a seat back side. A support body, a stay provided on the headrest side and slidably inserted into an insertion hole of the support body, and positioning means for locking the stay in the insertion hole of the support body,
The support body has a slide hole orthogonal to the insertion hole at its head, the stay has a plurality of positioning grooves on its side surface, and the positioning means includes an operation knob and a metal wire fixed to the operation knob. The metal wire is inserted into the slide hole and engages with the positioning groove of the stay, and is fixed to the operation knob side continuously from one end of the lock. A pair of guides having a fastening portion and an elastic arm portion for continuously and elastically urging the positioning means outward from the other end of the lock portion, and extending toward the metal wire body toward the operation knob of the positioning means. While the wall is extended, a configuration is adopted in which a pair of regulating walls are provided to regulate the insertion posture of the lock portion of the metal wire rod by abutting the guide wall on both side surfaces of the slide hole.

According to a second aspect of the present invention, based on the first aspect, a pair of elastic stopper walls are provided on the bottom side of the slide hole on the inner side of the insertion hole, and the metal wire rod member is provided on the pair of elastic stopper walls. A configuration is adopted in which both ends of the lock portion are locked.

According to a third aspect of the present invention, based on the first and second aspects, the one side between the lock portion on one side where the elastic arm portion of the metal wire is continuous and the corresponding side surface of the slide hole is provided. The configuration that defines a space that allows the bending deformation of the lock portion is adopted.

According to a fourth aspect of the present invention, based on the first to third aspects, the fastening portion of the metal wire is formed into an inverted U-shape, while the inverted U-shape similar to the operation knob side is formed. A configuration was adopted in which a fitting groove was formed, and the fastening portion was snap-fitted into the fitting groove.

According to the fifth aspect of the present invention, based on the premise of the second aspect, a configuration is adopted in which a space allowing bending is defined below the elastic stopper wall and on the end face side thereof.

Therefore, in the invention according to claim 1,
Since the positioning means itself is composed of only the operation knob and the metal wire, the number of parts can be reduced as compared with the conventional one, and the metal wire is fastened to the operation knob via the fastening portion. After that, it is only necessary to insert the lock portion of the metal wire into the slide hole of the support body, so that the assembling workability is very good. In addition, when the lock portion of the metal wire is inserted into the slide hole, the pair of guide walls abut against the corresponding regulating walls, and the insertion posture can be regulated, so that the lock portion of the metal wire is inclined and inserted. No worries at all.

According to the second aspect of the present invention, in addition to this, it is possible to reliably prevent the positioning means from coming off the slide hole. According to the third aspect of the invention, when the lock portion is inserted into the slide hole, it is possible to positively promote the bending deformation of the lock portion on one side which is continuous with the elastic arm portion. Work can be done with a small force. According to the fourth aspect of the present invention, the metal wire can be fastened to the operation knob side only by snap-fitting the inverted U-shaped fastening portion and the fitting groove, and the metal is fastened. The wire rod does not rattle against the operation knob. According to the fifth aspect of the present invention, it is possible to obtain the sufficient deflection of the elastic stopper wall and to lock the both ends of the lock portion of the metal wire rod very easily and surely. .

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a seat back according to a preferred embodiment of the present invention; FIG. A resin support main body 1 attached to a bracket fixed to an inner frame side, and a plurality of positioning grooves 21a provided on the headrest side and slidably inserted into the insertion holes 2 of the support main body 1 are formed. The support 21 includes a stay 21 and positioning means 31 for locking the stay 21 in the insertion hole 2 of the support body 1.

First, the positioning means 31 is composed of an operation knob 32 made of resin and a metal wire 33 fixed to the operation knob 32.
Is a push button-shaped base 3 as shown in FIG.
A pair of guide walls 34A and 34B having a dimensional difference are extended in the direction of the metal wire body 33 at a predetermined interval on the front side of the front surface 2a and integrally extended, and a short guide wall surrounded by the base 32a. An inverted U-shaped fitting groove 35 for fitting a fastening portion of a metal wire 33 to be described later is formed in a deep portion extending between the outside of the long guide wall 34B and the outside of the long guide wall 34B. The locking claw 36 is provided on the groove surface on the side of the long guide wall 34B, and the rising portion of the elastic arm portion of the metal wire body 33 described later is received outside the long guide wall 34B surrounded by the base 32a. The receiving groove 37 is formed.

As shown in the figure, the latter metal wire body 33 is formed by bending a single elastic wire, and has a rectangular lock portion 38 which is inserted into a slide lateral hole of the support body 1 to be described later. And an inverted U-shaped fastening portion 39 that is continuous from one end of the lock portion 38 and an elastic arm portion 40 that rises from the other end of the lock portion 38 and bends in the distal direction of the lock portion 38. In particular, in the middle of the distal end side of the lock portion 38, the stay 21 is folded inward in a U-shape.
The folded portion 38a engaged with the positioning groove 21a is positively formed.

Therefore, the rising portion 40 of the elastic arm portion 40
When the inverted U-shaped fastening portion 39 is snap-fitted into the similar fitting groove 35 while facing a in the receiving groove 37, the locking claw 36 is bent at the bent end of the fastening portion 39. As a result, as shown in FIG. 3, the metal wire body 33 is integrally fastened to the operation knob 32 with one touch without any play in the left-right direction and the up-down direction.

As shown in FIGS. 4 and 5, the support body 1 is entirely formed into a cylindrical shape, and an insertion hole 2 for slidably inserting a stay 21 is formed in the entire length of the support body 1, and the support body 1 is enlarged. A configuration in which a square block portion 4 is formed in the middle between the lower surface of the head 3 and a pair of locking leg pieces 5 elastically locked to the lower edge of the bracket below the intermediate block portion 4. It has become.

The enlarged head 3 is formed with a slide lateral hole 6 orthogonal to the insertion hole 2.
A contact wall 7 is vertically provided at the center of the upper surface on the opening side, and a pair of regulating walls 8 extending from the opening to the back side are provided on both side faces facing each other, and between each regulating wall 8 and the bottom surface. Space 9a to be defined
· A rectangular lock portion 38 of the metal wire body 33 in 9b.
, And each guide wall 34A.3 of the operation knob 32
When the guide wall 4B is inserted, the guide walls 34A and 34B come into contact with the corresponding regulating walls 8, so that a straight insertion posture of the lock portion 38 can be ensured.

In addition, with respect to the inner surfaces of the spaces 9a and 9b interposed between the respective regulating walls 8 and the bottom surface, the fastening portions 39
On the lock portion 38 side which is continuous with, a wide wall surface 10a protruding in the direction of the insertion hole 2 over a wide area is formed on the back side thereof,
On the side of the lock portion 38 that is continuous with the opposite elastic arm portion 40, a narrow wall surface 10b that protrudes in the direction of the insertion hole 2 is formed only at the deepest portion on the deep side, so that the space 9b on the lock portion 38 side is enlarged. Then, when inserted into the slide lateral hole 6, the lock portion 38 on one side is allowed to be sufficiently bent.

Further, a pair of elastic stopper walls 11 are provided on the inner side of the insertion hole 2 of the slide lateral hole 6 through the slit 12, and the lock portion 38 of the metal wire body 33 is inserted into the slide lateral hole 6. In this case, the distal end of the lock portion 38 is passed through the respective elastic stopper walls 11 while bending the elastic stopper walls 11 downward.
1 to prevent the positioning means 31 from coming off the slide lateral hole 6. For this reason, as shown in FIG.
A space 13 communicating with the slit 12 that allows a sufficient bending is defined and opened on the lower surface of the and the end surface thereof. In this case, the elastic stopper wall 11 can be provided without the slit 12.

Accordingly, under the positioning structure having such a configuration, first, the metal wire 3 of the positioning means 31 is inserted into the slide lateral hole 6 formed in the enlarged head 3 of the support body 1.
3 will be inserted. In this case, FIG.
As shown in FIG. 7, the pair of guide walls 34A and 34B provided on the operation knob 32 abut on the regulating wall 8 on the side of the slide lateral hole 6 to ensure the advance thereof, so that the locking portion 38 of the metal wire body 33 is secured. Is inserted straight into the slide lateral hole 6 without inclining, so that the reliability of the insertion operation can be obtained.

Further, the lock portion 38 is provided in each of the spaces 9a and 9b.
When inserted into the back of the slide lateral hole 6 through
At least the distal end side of the lock portion 38 on one side is guided by the wide wall surface 10a protruding over a wide area in the space 9a described above.
The straight insertion of 8 can further promote. In the space 9b on the opposite side, a narrow wall surface 1 protruding only at the deepest part.
0b does not participate in the guide of the lock portion 38 in the initial stage, but when the distal end of the lock portion 38 is completely inserted to the inner portion, it again comes into contact with the distal end side of the lock portion 38 and is most easily inclined. The insertion posture at the final stage is regulated.

In this case, when the lock portion 38 is gradually inserted into the depth side of the slide lateral hole 6, this time,
Since the elastic arm 40 of the metal wire body 33 elastically contacts the contact wall 7 of the opening of the slide lateral hole 6, the lock portion 38 on one side continuous with the elastic arm 40 is bent outward and deformed. As described above, since the space 9b on the lock portion 38 side is set large, as shown in FIG. 7, sufficient bending deformation of the one-side lock portion 38 is allowed, so that the lock portion 38 slides with a small force. It can be inserted into the lateral hole 6.

As shown in the figure, when the lock portion 38 is fully inserted, both ends of the lock portion 38 deflect the pair of elastic stopper walls 11 located on the back side downward, and move the elastic stopper walls 11 together. The positioning means 31 itself is retained without slipping out of the slide lateral hole 6 because it once gets over and is locked automatically. In this case, the elastic arm 40 is elastically attached to the contact wall 7. Due to the contact, the positioning means 31 is pushed back by the reaction force, and as shown in FIG. 8, the folded portion 38 a provided on the tip side of the lock portion 38 enters the inside of the insertion hole 2. .

It should be noted that only the folded portion 38a enters the inside of the insertion hole 2 and both ends of the lock portion 38 are located at the slide lateral holes 6a.
The structure still located on the back side of the elastic stopper wall 1
Since the length of the length 1 can be set to be large, the flexibility of the bending is enhanced, the insertion of the lock portion 38 is facilitated, and the secure locking state of the lock portion 38 to the elastic stopper wall 11 can be ensured. .

Therefore, although not specifically shown later,
When the support body 1 holding the positioning means 31 is pushed into the bracket on the side of the seat back, the above-mentioned locking leg piece 5 is elastically locked to the lower edge of the bracket, and the support body 1 is attached to the bracket side. After that,
When the operation knob 32 is pressed, the folded portion 38 of the lock portion 38 is pressed.
If a is retracted from the inside of the insertion hole 2, the stay 21 can be inserted into the insertion hole 2.

When the stay 21 is stopped at an arbitrary position and the operation knob 32 is depressed, as shown in FIG.
Of the headrest, and engages with the corresponding positioning groove 21a of the stay 21 in the insertion hole 2, whereby the headrest is positioned at a desired height position in a locked state. If it is desired to further adjust the positioning height, it is needless to say that the headrest can be locked at any position and positioned by simply repeating the same operation again.

[0030]

As described above, according to the present invention, by adopting the above-mentioned structure, according to the first aspect, the positioning means itself is composed only of the operating knob and the metal wire, so that the parts are compared with the conventional one. Since it is possible to reduce the number of points, it is only necessary to fasten the metal wire to the operation knob via the fastening part, and then insert the lock part of the metal wire into the slide hole of the support body. Assembly workability is also very good.
In addition, when the lock portion of the metal wire is inserted into the slide hole, the pair of guide walls abut against the corresponding regulating walls, and the insertion posture can be regulated, so that the lock portion of the metal wire is inclined and inserted. No worries at all.

According to the second aspect, in addition to this, the positioning means can be reliably prevented from coming off the slide hole. According to the third aspect, when the lock portion is inserted into the slide hole, it is possible to positively promote the bending deformation of the lock portion on one side which is continuous with the elastic arm portion. Can be done with Under claim 4, the metal wire can be fastened to the operation knob side only by snap-fitting the inverted U-shaped fastening portion and the fitting groove, and the fastened metal wire is There is no backlash to the operation knob. According to the fifth aspect, it is possible to obtain the sufficient bending of the elastic stopper wall and extremely easily and surely lock both ends of the lock portion of the metal wire rod.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part showing a positioning structure according to an embodiment of the present invention.

2A is a longitudinal sectional view showing only an operation knob of a positioning means, and FIG. 2B is a bottom view of the same.

FIG. 3 is a perspective view showing a state in which a metal wire is fixed to an operation knob.

FIG. 4 is a longitudinal sectional view showing a support main body.

5A is a cross-sectional view taken along line AA of FIG. 1, and FIG.
1 is a sectional view taken along the line BB of FIG. 1, (C) is a sectional view taken along the line CC of FIG.
(D) is a sectional view taken along line DD of FIG. 1.

FIG. 6 is a cross-sectional view showing an initial stage of inserting a metal wire body of a positioning means into a slide lateral hole of an enlarged head.

FIG. 7 is a cross-sectional view showing a state where the lock portion of the metal wire is inserted into the innermost part.

FIG. 8 is a cross-sectional view showing a state in which positioning means is held in a slide lateral hole of the enlarged head.

FIG. 9A is a cross-sectional view showing a state in which the stay is locked to the support main body, and FIG. 9B is a vertical cross-sectional view of the same.

FIG. 10 is an explanatory view for explaining a general ordinary automobile seat.

[Explanation of symbols]

 Reference Signs List 1 support main body 2 insertion hole 3 enlarged head (head) 6 slide lateral hole (slide hole) 7 contact wall 8 regulating wall 9a space 9b space 10a wall surface 10b wall surface 11 elastic stopper wall 12 slit 13 space 21 stay 21a positioning groove 31 Positioning Means 32 Operation Knob 32a Base 33 Metal Wire 34A Short Guide Wall 34B Long Guide Wall 35 Fitting Groove 36 Locking Claw 37 Receiving Groove 38 Lock 38a Folding Portion 39 Fastening Portion 40 Elastic Arm

Claims (5)

[Claims] 1. A support body of a headrest attached to a seatback side, a stay provided on the headrest side and slidably inserted into an insertion hole of the support body, and the stay is inserted into the insertion hole of the support body. Locking positioning means, the support body forms a slide hole orthogonal to the insertion hole in its head, the stay is
A plurality of positioning grooves are formed on the side surface, and the positioning means includes an operation knob and a metal wire rod fastened to the operation knob. The metal wire rod is inserted into the slide hole and positioned on the stay. A rectangular lock portion that engages with
A fastening portion which is continuously fastened to the operation knob side from one end of the lock portion, and an elastic arm portion which continuously and outwardly biases the positioning means itself from the other end of the lock portion, A pair of guide walls extending in the direction of the metal wire is extended on the operation knob side of the positioning means, and the guide walls are brought into contact with both side surfaces of the slide hole to regulate the insertion posture of the lock portion of the metal wire. A headrest positioning structure comprising a pair of regulating walls. 2. A pair of elastic stopper walls are provided on the bottom side of the slide hole on the inner side of the insertion hole and the pair of elastic stopper walls are engaged with both ends of the lock portion of the metal wire rod. The headrest positioning structure according to claim 1, wherein: 3. A space that allows bending deformation of the lock portion on one side is defined between the lock portion on one side where the elastic arm portion of the metal wire body is continuous and the corresponding side surface of the slide hole. The headrest positioning structure according to any one of claims 1 and 2. 4. A fastening portion of a metal wire body is formed in an inverted U-shape, and an inverted U-shaped fitting groove similar to the operation knob is formed, and the fastening portion is formed in the fitting groove. The headrest positioning structure according to any one of claims 1 to 3, wherein the headrest is snap-fitted. 5. The headrest positioning structure according to claim 2, wherein a space allowing bending is defined below the elastic stopper wall and on an end face side thereof.