JP2000041783A - Locking device for headrest support - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with the demand of cost reduction by reducing the number of components as much as possible and further improving molding workability and assembling workability. SOLUTION: The height adjuster body P of a headrest 4 is fitted and supported at the seat back T of an automobile the supporting rod R of the headrest H is inserted to the height adjuster body P provided with an upper end box chamber K and it is incorporated in a slider S for energizing freely engageably and disengageably with the notch of the supporting rod R. Then, an engaging projection 18 is formed at the bottom part of the push knob 9 of the slider S and it is fitted to an engaging hole 5 or an engaging groove 15 formed at the expanded part 6 of the upper end box chamber K freely movably back and forth. Also, the slider S is integrally formed by the push knob 9 and a slide frame 10, and a metallic lock bar 17 freely engageable and disengageable with the notch of the supporting rod R is fitted at the rear position of the left and right side plate parts of the slide frame 10. Also, a thin groove 12 is formed at the left and right side plate parts of the slide frame 10, and at the time of assembling the slider S to the upper end box chamber K, the slider S is slightly bent upwards by the thin groove 12 and is elastically restored and incorporated after assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for a headrest support for supporting a vehicle headrest at an appropriate height so as to be vertically adjustable.

[0002]

2. Description of the Related Art Conventionally, as a locking device for a headrest support, those used by various automobile companies have been used. More specifically, in the case of a "headrest for a vehicle" disclosed in Japanese Utility Model Publication No. 51-24664 or a "headrest support" described in Japanese Utility Model Publication No. 5-25484, a notch formed in a support rod of the headrest is disengaged. It has been put into practical use with a lock structure made of a metal plate lock plate and one or two coil springs for urging and supporting the engagement state.
The headrest support in the "headrest for vehicle" disclosed in Japanese Patent Publication No. 4 has been provided for many years.

[0003]

Meanwhile, recently, there has been a demand for cost reduction of these small parts, and this is achieved by reducing the number of parts as much as possible, and further improving the molding workability and the assembling workability. Therefore, it is necessary to deal with the request for cost reduction.

[0004] In view of the above, in the headrest support disclosed in the above publication, first of all, instead of combining and integrating a metal lock plate and a synthetic resin knob, all of the headrest supports are synthesized. Based on a slider integrally formed of resin as a base, the slider is provided with an engaging projection formed on a flange disc to secure a moving stroke in the front-rear direction and to prevent the slider from coming off. Or a structure in which the slider is assembled with a simple structure, such as a structure in which the slider is engaged with the engagement groove, and a structure in which a metal lock bar is fitted to engage and disengage with the notch of the support rod of the headrest. The request has been addressed by improving the above.

[0005]

Therefore, according to the present invention, a height adjuster main body P of a headrest H is inserted and supported in a seat back T of an automobile, and a flange plate 1 is mounted on an upper end portion of the height adjuster main body P. And the flange cover 2 to form an upper end box chamber K, and the support rod R of the headrest H is inserted into a height adjuster main body P having the upper end box chamber K,
An engaging projection 18 is provided on the bottom surface of the push knob 9 of the slider S in the headrest support in which the slider S that urges the notch N of the support rod R so as to be able to engage and disengage is provided in the upper end box chamber K. Provided is a headrest support locking device configured to lock the engagement protrusion (18) in the engagement hole (5) or the engagement groove of the overhang (6) of the flange disc (1).

Further, in the invention described in claim 2, the slider S is integrally formed with the push knob 9 and the slide frame 10, and the notch of the support rod R is provided at a position behind the left and right side plate portions 10A of the slide frame 10. N, a lock bar 17 made of metal that can be detachably engaged with N. A small groove 12 is formed in the left and right side plate portions 10A of the slide frame 10. When the slider S is assembled to the upper end box chamber K, the small groove 12 is used. As a result, the slider S is slightly bent upward, and after being assembled, is elastically restored to be assembled.

In the third aspect, the slider S has elastic projections 19 on the left and right side plate portions 10A of the slide frame 10.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a headrest support device according to the present invention is usually provided in a seat back T of an automobile. More specifically, a "headrest for vehicles" disclosed in Japanese Utility Model Publication No. 51-26464, It is attached in the same positional relationship as in the case of the "headrest support" shown in Japanese Utility Model Publication No. 5-25484.

The outline is that a height adjuster main body P of a headrest H is inserted and supported in a seat back T of an automobile, and a support rod R of the headrest H is dropped into the height adjuster main body P from above and penetrates. Inserted.

In FIG. 1 and FIG. 2, a substantially rectangular plate-like flange plate 1 is formed on the upper end of a synthetic resin height adjuster main body P, and an upper peripheral edge except for a front side thereof is a flange cover. 2, is covered with a flange cover 2 composed of left and right side walls 2A, 2B, a back wall 2C, and a ceiling wall 2D.
An upper end box chamber K having an opening is formed.

Reference numeral 4 denotes a side guide portion of the slider S which is formed stepwise on the inner wall surfaces of the left and right side wall portions 2A and 2B. Reference numeral 5 denotes a rectangular shape formed near the center of the projecting portion 6 on the front side of the flange disk 1. An engagement hole, into which an engagement protrusion 18 of the slider S described later is fitted. Note that, instead of the engaging hole 5, an engaging groove may be formed in the overhanging portion 6.

Reference numerals 7 and 8 denote insertion holes for the support rod R of the headrest H, of which the upper rod insertion hole 7 is located substantially at the center of the flange cover 2 and the lower rod insertion hole 8 is provided. An opening is formed at a substantially central position of the flange disk 1,
By dropping the support rod R from above and fitting it in,
It is inserted into the height adjustment tool main body P.

The slider S is an integrally molded product made of synthetic resin, and has a relatively thick push knob 9 on the front side and a thickness of about half that of the push knob 9 on the rear side. The upper end box chamber K is inserted into the upper end box chamber K by inserting the slide frame 10 into the chamber.

Reference numeral 11 denotes a substantially rectangular rod insertion hole formed in the slide frame 10, and the left and right side plate portions 10A of the slide frame 10 are formed in the side guide portion 4 so as to be slidably stepped. At this time, the plate portion a in the front half is formed wider than the plate b in the rear half.

On the upper surface of the plate portion a in the front half of the side plate portion 10A, a narrow groove 12 is recessed, and when the slider S faces the insertion opening 3 and is fitted into the upper end box chamber K, a slide frame is formed. 10 is slightly bent upward to facilitate the fitting.

Numeral 13 denotes a projection protruding from the center of the rear surface of the rear plate portion 10B of the slide frame 10, into which a coil spring 14 is fitted, and which is recessed at the center position inside the rear wall portion 2C of the flange cover 2. It is inserted into the mating hole 15.

Reference numeral 16 denotes a fitting groove which is formed in the bottom of the slide frame 10 and is recessed at a position near the rear of the plate portion b in the rear half of the side plate portion 10A and at the bottom of the reinforcing corner position with the rear plate portion 10B. A band-shaped or rod-shaped metal lock bar 17 is fitted into the fitting groove 16.

Reference numeral 18 denotes an engagement protrusion protruding from the bottom of the bush knob 9, and is fitted into the engagement hole 5 or the engagement groove.

In order to assemble the slider S in the upper end box chamber K of the height adjusting tool main body P, first, the lock bar 17 is fitted into the fitting groove 16 of the slide frame 10 of the slider S, and the protrusion is formed. 13 is fitted with a coil spring 14.

Next, the slide frame 10 of the slider S is
When the slider S is pushed to the inside as shown in FIG. 4A, the engaging projection of the slider S is pushed into the interior of the height adjuster body P while facing the insertion opening 3 of the upper end box chamber K. 18 is locked to the front end of the overhang portion 6.

Therefore, the push knob 9 of the slider S is used to release the engagement between the engaging projection 18 and the overhanging portion 6.
As shown in FIG. 4 (b), the slider S is slightly pushed upward and rearward as shown in FIG. 4 (b), so that the push knob 9 side of the slider S is slightly bent with respect to the narrow groove 12 of the slider frame 10, and In this state, the slider S is further pushed in as shown in FIG.

With the engagement projection 18 of the slider S facing the engagement hole 5 of the overhang portion 6, the slide frame 10 exerts an elastic restoring force, thereby causing the slider S to move as shown in FIG. The slider S is assembled by being inserted into the upper end box chamber K, whereby the slider S is configured to be slidable in the front-rear direction between the pushed-in position in FIG. 4E and the elastic return position in FIG. 4D. ing.

Therefore, the support rod R of the headrest H
As shown in FIGS. 1 to 3, the slide rod is dropped down to face the rod insertion holes 7 and 8, and is pushed down while the push knob 9 of the slider S is being pushed in, or the support rod R
When the slider S is pushed in at the stage where the notch N formed in the multistage is hit at the lowermost stage, the headrest H is further pushed down.
When the pushing operation is stopped, the slider S moves to the notch N
The lock bar 17 of the slide frame 10 is locked at an appropriate stage.

In adjusting the height of the headrest H, first, the push knob 9 of the slider S is pushed in to release the lock engagement between the lock bar 17 and the notch N as shown in FIG. While keeping the height of the headrest H raised or pushed down, the pushing force of the slide S is released at an appropriate height position. Then, as shown in FIG. 2, the lock bar 17 is locked by engaging the notch N of an appropriate step of the support rod R.

FIGS. 6 to 8 are views showing modified examples of the slider S. The side surface arc shape is formed at the end of the wide portion a of the left and right side plate portions 10A of the slide frame 10 and the narrow groove 12. FIG. An elastic protruding piece 19 having a transverse cross-sectional shape in which the left and right ends are slightly upwardly inclined is formed integrally.

In the case of the lock device according to the above-described embodiment, as shown in FIGS. 3 and 4 (a) to 4 (e), the upper surface of the slide frame 10 of the slider S and the ceiling portion of the upper box room K. , There is a gap of about 0.5 mm. Therefore, as shown in FIG. 8, the slider S to be assembled in the upper end box chamber K is brought into close and elastic contact with the ceiling of the chamber via the elastic projections 19, thereby preventing the slider S from rattling during the longitudinal movement. The moderation when moving back and forth is further improved.

[0027]

As described above, according to the present invention, the height adjuster main body P of the headrest H is inserted and supported in the seat back T of the automobile, and the flange disc 1 is mounted on the upper end of the height adjuster main body P.
And the flange cover 2 form an upper end box chamber K, and the support rod R of the headrest H is inserted into the height adjuster main body P having the upper end box chamber K to engage with the notch N of the support rod R. Slider S that is removably urged
In the headrest support formed in the upper end box chamber K, an engagement projection 18 is provided on the bottom surface of the push knob 9 of the slider S, and the engagement projection 18 is engaged with the projection 6 of the flange disc 1. Since the headrest support locking device is configured to be locked in the hole 5 or the engagement groove, it is possible to significantly improve the forming workability of the main components and the workability of assembling the respective components. This contributes to the reduction of the product cost of the headrest height adjuster.

In particular, according to the second aspect of the present invention, the slider S is formed integrally with the push knob 9 and the slide frame 10, and the notch N of the support rod R is provided at a position behind the left and right side plate portions 10A of the slide frame 10. A metal lock bar 17 that can be freely engaged with and disengaged from the slide frame 10 is fitted, and a narrow groove 12 is formed in the left and right side plate portions 10A of the slide frame 10. When the slider S is assembled to the upper end box chamber K, the narrow groove 12 Since the slider S is slightly bent upward and is elastically restored after the assembly, the slider S is supported.
The structure of the components for urging engagement with the notch N is simple, the moldability of the slider S, which is the main component thereof, is excellent, and the work of assembling the lock bar 17 and the coil spring 14 to the slider S can be performed. The work of assembling it into the upper end box chamber K can be performed quickly and easily, and as a result, the workability of assembling to the height adjusting tool main body can be remarkably improved.

As described in claim 3, the elastic protrusions 1 are provided on the left and right side plate portions 10A of the slide frame 10 of the slider S.
9, the slider S assembled to the upper end box chamber K is brought into close and elastic contact with the ceiling of the chamber via the elastic projection 19 to prevent backlash when the slider S moves back and forth, and moves back and forth. Moderation in time is further improved.

Of course, since the slider S fitted with the metal lock bar 17 is urged and supported in the upper end box chamber K so as to be able to move back and forth, a smooth and reliable lock and lock with the notch N of the support rod R is achieved. Release can be performed, and various effects such as excellent operability can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an upper structure of a height adjuster main body, a slider inserted into an upper end box chamber, a lock bar and a coil spring attached to the slider, which constitute a main part of the present invention. Among them, the positional relationship between the headrest and the seat back with reference to the height adjusting tool main body is shown by imaginary lines.

FIG. 2 is a cross-sectional plan view of a slider portion set in an upper end box chamber, showing a state in which a support rod of a headrest is inserted into a rod insertion hole and a lock bar is engaged with a notch of the support rod. I have.

FIG. 3 is a longitudinal sectional side view showing a locked state of a support rod and a lock bar.

FIG. 4 is a vertical cross-sectional view showing a state of pushing a slider assembled into an upper end box chamber.

FIG. 5 is a cross-sectional plan view showing a state where the slider is pushed in against the urging force of the coil spring and the engagement between the support rod and the lock bar is released.

FIG. 6 is a perspective view showing a modified example of the slider, in which a resilient protruding piece is formed at an upper end position of the left and right side plate portions of the slide frame.

FIG. 7 is a vertical cross-sectional front view showing the elastic protruding piece that has been flipped up.

FIG. 8 is a vertical sectional side view showing the slider assembled to the upper end box chamber.

[Explanation of symbols]

 T Seat back H Headrest R Support rod N Notch P Height adjuster main body K Upper box room S Slider 1 Flange board 2 Flange cover 2A, 2B Side wall 2C Back wall 2D Ceiling wall 3 Insertion port 4 Side guide 5 Mating hole 6 Overhanging portion 7, 8, 11 Rod insertion hole 9 Push knob 10 Slide frame 10A Side plate 10B Rear plate 12 Narrow groove 13 Projection 14 Coil spring 15 Engagement hole 16 Fitting groove 17 Lock bar 18 Engagement protrusion 19 Elastic projection

Claims (3)

[Claims] 1. A height adjusting tool main body P of a headrest H is inserted into and supported by a seat back T of an automobile, and an upper end box chamber is formed by a flange plate 1 and a flange cover 2 at an upper end of the height adjusting tool main body P. K, a slider S which penetrates the support rod R of the headrest H into the height adjuster main body P provided with the upper end box chamber K and urges the notch N of the support rod R so as to freely engage and disengage. In the headrest support configured in the upper end box chamber K, an engagement protrusion 18 is provided on the bottom surface of the push knob 9 of the slider S.
A locking device for the headrest support, wherein the engaging projections 18 are engaged with the engaging holes 5 or the engaging grooves of the projecting portion 6 of the flange disc 1. 2. A metal lock bar, which is integrally formed with a slider S by a push knob 9 and a slide frame 10, and which is detachable from a notch N of a support rod R at a position behind the left and right side plate portions 10A of the slide frame 10. 17 is fitted, and a narrow groove 12 is formed in the left and right side plate portions 10A of the slide frame 10. When the slider S is assembled in the upper end box chamber K, the narrow groove 1 is formed.
2. The headrest support locking device according to claim 1, wherein the slider S is slightly bent upward by 2, and is elastically restored after being assembled. 3. The headrest support locking device according to claim 2, wherein elastic projections 19 are provided on the left and right side plate portions 10A of the slide frame 10.