JP4368736B2 - Headrest - Google Patents

Description

  The present invention relates to a headrest attached to a seat of an automobile, for example.

  Conventionally, as this type of headrest, for example, one having a configuration as disclosed in Patent Document 1 is known. That is, in the conventional configuration of this Patent Document 1, a pair of insertion holes are formed on both sides of the bottom of the bag-shaped skin material, and a slit-shaped opening is formed between the both insertion holes. Then, the headrest stay is disposed inside the skin material, and the foamed resin material is injected into the skin material from the opening and foamed and expanded with both legs of the headrest stay protruding from the insertion hole. Thus, the headrest is formed.

Further, in this conventional configuration, as shown in FIG. 7 , protrusions 21 a and 21 b are formed at the edges of a pair of fabrics constituting the skin material 21 with the opening structure of the skin material reversed. ing. A pair of seams 22, 23 are formed at two positions on both sides of the protrusions 21a, 21b in parallel with each other, and the seams 22, 23 form a pair of insertion holes 26 in the protrusions 21a, 21b. And the opening 24 are partitioned. The opening 24 is for injecting the foamed resin material into the skin material 21, and the insertion hole 26 is for inserting the leg portion 25 a of the headrest stay 25.

In this case, as shown in FIG. 8 (a), the interval L1 between the pair of insertion holes 26 are formed to be narrower than the interval L2 between the legs 25a of the headrest stay 25. Then, by forcibly inserting the both leg portions 25a of the headrest stay 25 into the both insertion holes 26, the portion of the opening 24 of the skin material 21 is pulled to both sides based on the dimensional difference between the distances L1 and L2. The opening 24 is kept closed. This prevents the synthetic resin from leaking from the opening 24 when the foamed resin material is expanded.

However, in this conventional headrest, as shown in FIG. 8 (b), when both leg portions 25a of the headrest stay 25 with a wide interval L2 are forcibly inserted into both insertion holes 26 with a narrow interval L1, each pair of seams 22 is provided. , 23, tension in the pulling direction acts on the skin material 21 at the portion of the seam 23 located on the side of the opening 24 in the center of the skin material 21, and the skin material 21 is formed on the skin material 21 by these seams 23. The threaded through hole is expanded. Thereby, even if the resin sheet which does not let the foamed resin raw material pass is provided on the back surface side (inner surface side) of the skin material 21, the same raw material leaks to the outside from the portion of the seam 23 during the foam expansion of the foamed resin raw material. The appearance as a headrest is impaired. Since the seam 22 opposite to the opening 24 is pressed against the leg portion 25a, the thread through hole formed by the seam 22 does not widen.

  Further, in Patent Document 2, when forming a bag-like skin material by stitching edges of a plurality of fabrics, a resin film is attached to the upper thread side of the stitched portion of the fabric, and foaming of the foamed resin material is performed. A cushion molded body is disclosed that prevents the raw material from leaking from the stitched portion during expansion.

For the same purpose, as shown in FIG. 7 , a resin film 27 is attached to the inner surface of the fabric of the skin material 21 so as to cover the pair of seams 22 and 23, and the seams 22 and 23. Attempts have also been made to prevent leakage of synthetic resin from the portion.
JP-A-9-95199 JP-A-8-71268

However, even in the case of covering the seam 22, 23 by the film 27 as described above, as shown in FIG. 8 (b) (c), when inserting the leg portion 25a of the headrest stay 25 both insertion holes 26, When the portion between the two insertion holes 26 of the skin material 21 is pulled outward on both sides and a tension acts on the portion of the seam 23, the fabric is extended and the resin film 27 is easily peeled off from the state of being adhered to the fabric. Originally, the adhesive force of the resin film 27 to the fabric is weak in this portion due to unevenness caused by sewing. Accordingly, as shown in FIG. 8 (c), a gap S is formed between the seam 23 and the film 27, and the liquid foamed resin material enters the gap S, and the film 27 is present. Also, the foamed resin material leaks from between the outer peripheral surface of the thread of the seam 23 and the inner peripheral surface of the thread through hole. Further, since the seam 23 extends along the width direction of the protrusions 21a and 21b, in other words, at right angles to the length direction of the protrusions 21a and 21b (the left-right direction in FIG. 7 ), the length thereof Is short. For this reason, the leakage distance of the foamed resin material along the seam 23 is shortened, and the leakage is likely to occur.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose is to provide a headrest that can prevent leakage of the foamed resin material from the seam portion defining the insertion hole.

  In order to achieve the above object, according to the first aspect of the present invention, a headrest stay is disposed inside a bag-shaped skin material, and a pair of leg portions of the headrest stay is attached to a pair of bottom portions of the skin material. Each of the headrests is formed by injecting a foamed resin raw material into the inside of the skin material from the opening of the skin material located between the insertion holes, and forming the skin material. Protruding portions are formed at the edges of the fabrics that are sewn together, and a pair of seams are provided at two locations of the protruding portions, so that both the insertion holes and the openings are defined, and the legs are formed in the insertion holes. The interval between both insertion holes is set to be narrower than the interval between both leg portions so that the tension in the direction in which the opening is closed acts on the skin material by inserting the portion, and further covers the seam In a headrest having a resin film affixed to the inner surface of the skin material, the adjacent portion adjacent to the outer peripheral surface of the leg portion is separated from the outer peripheral surface of the leg portion at the opening side seam among the pair of seams. It is characterized by forming a part.

According to a second aspect of the present invention, in the first aspect of the present invention, the resin film is provided on the base end side of the projecting portion.
According to a third aspect of the present invention, in the first or second aspect of the present invention, a connection portion that connects the proximity portion and the separation portion is provided at the seam, and the connection portion and the separation portion are connected to each other. An inflection point consisting of a corner is provided between them.

(Function)
In the present invention, the seam on the opening side is formed with a proximity portion that is close to the outer peripheral surface of the leg portion and a separation portion that is separated from the outer peripheral surface of the leg portion, so that the leg portion of the headrest stay with respect to both insertion holes At the time of insertion, a strong tension acts on the portion of the proximity portion by joining with the outer peripheral surface of the leg portion, but a very strong tension does not act on the separation portion. Therefore, peeling of the film from the inner surface of the skin material can be suppressed, and thus leakage of the foamed resin material from the seam portion can be prevented.

  As described above, according to the present invention, it is possible to prevent the foamed resin from leaking from the seam portion defining the insertion hole during foaming expansion of the foamed resin raw material. Can be improved. In addition, since a dedicated component is not provided as a configuration for that purpose, the number of components is not increased and the configuration is simple.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the skin material 12 that forms the outline of the pad portion 11 of the headrest is formed by sewing a plurality of fabrics 12 </ b> A, 12 </ b> B, 12 </ b> C, etc., cut into a predetermined shape at their edges, as a whole After forming so as to form a bag, the front and back are reversed. A slit-like opening 13 is formed between the edges of the fabrics 12A and 12B at the center of the bottom of the skin 12 so that the pad 12 is positioned at the center of the bottom. It is designed to reverse the front and back.

  In FIG. 3, the structure of the opening 13 of the skin material 12 is shown in a state before the front and back are reversed. As shown in the drawing, folding projections 12a and 12b are cut and formed at the center of the edge of the pair of fabrics 12A and 12B facing each other, and the center of the base of the projections 12a and 12b is sewn. A non-sewn part is provided. Then, after sewing the fabrics 12A, 12B, and 12C, the skin material 12 is reversed, and the protrusions 12a and 12b are protruded inward toward the inside of the skin material 12, so that the space between the protrusions 12a and 12b. A non-sewn part is formed in the shape of a slit as the opening 13.

  A pair of seams 14, 15 are formed on both side edges of the protruding portions 12 a, 12 b of the skin material 12 with a space between each other, and a pair of insertion holes 16 are defined between the seams 14, 15. Is formed. Of the pair of seams 14 and 15, the opening 13 is defined between the inner seams 15 located on the center side of the skin material 12.

  Here, the outer seam 14 positioned away from the opening 13 is continuous with the seam formed along the peripheral edges of the fabrics 12A and 12B except for the tip edges of the protrusions 12a and 12b. The inner seam 15 that divides is formed only in the protrusions 12a and 12b. Accordingly, the outer seam 14 serves both as the sewing of the fabrics 12A and 12B and the formation of the section of the insertion hole 16.

  Then, as shown in FIG. 1, in a state where the skin material 12 is turned upside down, the leg portion 17 a of the headrest stay 17 is inserted into the skin material 12 from one insertion hole 16, and then from the other insertion hole 16. The base end portion 17 b of the headrest stay 17 is accommodated and arranged inside the skin material 12 by being inserted outside and extracted.

  As shown in FIG. 4A, the distance L <b> 1 between the pair of insertion holes 16 is formed to be narrower than the distance L <b> 2 between both leg portions 17 a of the headrest stay 17. Then, both leg portions 17 a of the headrest stay 17 are forcibly inserted into the both insertion holes 16 so as to widen the space between the two insertion holes 16. Even if the gap L1 is formed so as to be equal to the gap L2 when the skin material 12 is sewn, since the skin material 12 swells during the foam expansion of the foamed resin material described later, the insertion hole 16 and its outer peripheral portion are also It swells at the same time, and the interval L1 becomes substantially narrower than the interval L2, which is the same as forcibly inserting the both leg portions 17a.

  When the both leg portions 17a of the headrest stay 17 are forcibly inserted into both the insertion holes 16 so as to widen the gaps between the two insertion holes 16, the center portion side of the skin material 12 among the pair of seams 14, 15 is provided. The projecting portions 12a and 12b in the portion between the inner seams 15 adjacent to each other are pulled and tensioned. Thereby, both ends of the opening 13 of the skin material 12 are pulled to both sides, so that the opening 13 is always kept closed. In FIG. 4A, in order to facilitate understanding, the interval L1 between the insertion holes 16 and the interval L2 between both leg portions 17a are depicted as the interval between the center portions. The interval L1 indicates the interval between the inner seams 15, and the interval L2 indicates the interval between the outer peripheral surfaces of the portions in contact with the seams 15 of both leg portions 17 a.

  As shown in FIG. 3, among the pair of seams 14 and 15 that define both the insertion holes 16, a part of the inner seam 15 that is adjacent to the opening 13 side has a portion from the center of the insertion hole 16. A separating portion 15b is formed so as to extend in a direction away from the outer peripheral surface of the leg portion 17a of the headrest stay 17 inserted through the insertion hole 16. That is, in this embodiment, the inner seam 15 is formed between a parallel part (proximity part) 15a as a proximity part located close to the outer peripheral surface of the leg part 17a, a separation part 15b, and an end portion thereof. It is comprised from the connection part 15c to connect. Therefore, an inflection point made of a corner is formed at the intersection of the spacing portion 15b and the connecting portion 15c.

  And the parallel part 15a of the said seam 15 is formed so that it may extend in parallel with the outer seam 14 from the front-end edge of the protrusion parts 12a and 12b of cloth | dye 12A, 12B to the substantially intermediate part position of the extension direction of the insertion hole 16. ing. The spacing portion 15b is formed so as to extend in a state inclined by a predetermined angle from the base portion of the protruding portions 12a, 12b of the fabrics 12A, 12B toward the opening 13 side. Furthermore, the connection part 15c is formed so that it may extend in the state inclined between the edge part of the parallel part 15a, and the edge part of the separation | spacing part 15b.

  As shown in FIGS. 3 and 4 (b), a pair of resin films 18 are formed on the inner surface of the skin material 12 in the vicinity of the roots (base ends) of the protrusions 12a and 12b of the fabrics 12A and 12B. Affixed to the resin film 18 by the action of the adhesive, the resin film 18 covers each pair of seams 14 and 15 that define and form the insertion hole 16 except for the front ends of the projecting portions 12a and 12b. ing.

  When the pad portion 11 of the headrest is molded, as shown in FIG. 1, the skin material 12 is placed in a molding die (not shown) in a state where the base end portion 17 b of the headrest stay 17 is disposed inside the skin material 12. Set. After that, the raw material of the liquid foamed resin 19 is injected into the inside of the skin material 12 from the opening 13 and foamed and expanded, so that the pad portion 11 of the headrest is molded into a shape according to the cavity of the molding die. ing.

Next, the operation of the headrest configured as described above will be described.
Now, in this headrest, as shown in FIG. 4A, the interval L1 between the insertion holes 16 provided on both sides of the opening 13 of the skin material 12 is larger than the interval L2 between the both leg portions 17a of the headrest stay 17. It is formed to be narrow. For this reason, as shown in FIG. 4 (b), when both leg portions 17a of the headrest stay 17 are forcibly inserted into both insertion holes 16, both end portions of the opening 13 of the skin material 12 are pulled to both sides, and the openings 13 is kept in a normally closed state. Therefore, the raw material of the resin 19 hardly leaks from the opening 13 during the expansion of the raw material of the foamed resin 19 injected into the skin material 12.

  Further, as shown in FIGS. 3 and 4B and 4C, a resin film 18 is affixed to the inner surface of the skin material 12 to cover the seams 14 and 15 for defining the insertion holes 16. Yes. Further, a part of the inner seam 15 located adjacent to the center part side of the skin material 12 is formed with a separation part 15 b extending in a direction away from the outer peripheral surface of the leg part 17 a of the headrest stay 17.

For this reason, when the leg portions 17a of the headrest stay 17 are inserted into the both insertion holes 16, a strong tension is applied to the parallel portion 15a portion of the inner seam 15 due to the joining with the outer peripheral surface of the leg portion 17a. Although it acts, in the separation | spacing part 15b of the seam 15, since it is spaced apart from the outer peripheral surface of the leg part 17a, a very strong tension does not act on the part. Therefore, the thread through-hole is hardly pushed and the resin film 18 is not peeled off at the separation portion 15b of the seam 15. Therefore, the gap as shown in FIG. 8 is hardly formed, and when the raw material of the foamed resin 19 is injected into the skin material 12 and expanded, the raw material of the resin 19 is introduced from the inner seam 15 portion. Leakage can be prevented. Moreover, the leakage of the raw material from between the outer peripheral surface of the leg part 17a and the inner peripheral surface of the insertion hole 16 is blocked | prevented by the part of the parallel part 15a. Further, since an inflection point is formed between the separation portion 15b and the connection portion 15c of the seam 15, the leakage distance of the foamed resin material along the seam 15 is increased, and the leakage is stopped at the inflection point. Can be effectively prevented from leaking. Therefore, it is possible to mold the high-quality pad portion 11 having a good appearance that does not leak the foamed resin material.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
· As shown in FIG. 5, and Turkey be extended shorter than the parallel portion 15a of the inner seam 15 in both the insertion hole 16 of the first embodiment.

· As shown in FIG. 6, you extension shorter than the parallel portion 15a of the inner seam 15 in both the insertion hole 16 of the first embodiment. Further, as the separating portion 15b is inclined in the opposite direction to that of the first embodiment, that is, as the transition from the leading edge of the protruding portions 12a, 12b of the fabrics 12A, 12B to the root portion, the opening 13 side To be inclined to

  In each of the above embodiments, the seam 14 for sewing the fabrics 12A and 12B of the skin material 12 has the partition function of the insertion hole 16, but the seam 14 does not have the partition function of the insertion hole 16. The configuration is such that only the insertion hole 16 is partitioned.

The partially broken perspective view which shows the headrest of one Embodiment. The partial cross section figure which shows the part of the penetration hole. The partial front view which shows the sewing structure of the insertion hole in the headrest in the front-and-back inversion state. (A), (b) is sectional drawing explaining the insertion process of the leg part of the headrest stay with respect to the insertion hole, (c) is sectional drawing which shows the sticking part of a film. The partial front view which shows the example of a change of the sewing structure of an insertion hole in the front and back inversion state. The partial front view which shows the example of a change of the sewing structure of an insertion hole in the front and back inversion state. Partially correct showing the sewing structure of the insertion hole in the conventional headrest in an inverted state Plan view. (A), (b) is insertion passage of the leg part of a headrest stay with respect to the insertion hole Sectional drawing explaining a process, (c) is sectional drawing which shows the sticking part of a film.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Pad part, 12 ... Skin material, 12A ... Fabric, 12a, 12b ... Projection part, 13 ... Opening, 14, 15 ... Seam, 15a ... Parallel part (proximity part), 15b ... Separation part, 15c ... Connection part, 16 ... Insertion hole, 17 ... Headrest stay, 17a ... Leg part, 17b ... Base end part, 18 ... Resin film, 19 ... Foamed resin, L1 ... Spacing of insertion hole, L2 ... Spacing of leg part.

Claims (3)

A headrest stay is arranged inside the bag-shaped skin material, and a pair of leg portions of the headrest stay is protruded from a pair of insertion holes at the bottom of the skin material, and the skin material located between the insertion holes A headrest in which a foamed resin material is injected into the inside of the skin material from the opening and expanded,
By forming protrusions at the edges of the fabric that are sewn together so as to constitute the skin material, and providing a pair of seams at two locations of the protrusions, the insertion holes and the openings are partitioned. In addition, the interval between the two insertion holes is set to be narrower than the interval between the two leg portions so that the tension in the direction in which the opening is closed acts on the skin material by inserting the leg portions into the insertion holes. In addition, in the headrest in which a resin film is attached to the inner surface of the skin material so as to cover the seam,
Of the pair of seams, a seam on the opening side is formed with a proximity portion that is close to the outer peripheral surface of the leg portion and a separation portion that is separated from the outer peripheral surface of the leg portion, and at least covers the separation portion. A headrest comprising the resin film. The headrest according to claim 1, wherein the resin film is provided on a base end side of the protruding portion. 3. The inflection point formed by a corner is provided between the connection portion and the separation portion, and a connection portion that connects the proximity portion and the separation portion is provided at the seam. Headrest described in.

Images