JPH04261693A - Cushion for furniture - Google Patents

Abstract

PURPOSE:To prevent a facing portion from being wrinkled without any manual operation of skilled operators by covering the surface of a cushion core material having elasticity with a coating material and sewing the core material at the corner of the cushion core material with gathered sewing. CONSTITUTION:A cushion 1 comprises a cushion core material 3 having elasticity and a coating material 4 to cover the surface 3a of the cushion core material 3 with the end edge 4a being folded to the rear surface 3b side of the cushion core material 3. The folded part 4b of the coating material 4 is provided with a thread 5 sewn on a line along a loop smaller than the largest outline of the cushion core material 3. The thread portion 5a in portions corresponding to corners 31 of the cushion core material 3 is sewn with gathered sewing and the coating material 4 is bonded to the front and rear surfaces 3a, 3b of the cushion core material 3 by the use of adhesives. The cushion core material 3 is integrally molded by the use of urethane or the like.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cushions used for furniture such as chairs.

0002

[Prior Art] Conventionally, for example, cushions constituting the seat and back of a chair have been provided with a backing plate such as a plywood board or a plastic molded body on the back side of the cushion core material, and a Generally, the cushion is covered with an overlay, and the edge portion of the overlay is wrapped around the back side of the cushion core material and fixed to the backing plate with a tacker or the like.

0003

[Problems to be Solved by the Invention] However, in the manufacturing process of a product having such a structure, the edge portions of the upholstery are pinched and pulled strongly inward, and the edge portions are sequentially rubbed with a tacker or the like. It is necessary to attach it to the backing plate.

[0004] By the way, plain-woven fabrics are often used as upholstery materials for this type of cushion from practical standpoints such as price and durability, but ordinary plain-woven fabrics have poor elasticity in the vertical and horizontal directions. poor.

[0005] Therefore, in order to cover the outer surface of the cushion core material with such a top material as described above, the shape must be adjusted with the corners of the cushion core material partially compressed and deformed. , it is not possible to obtain wrinkle-free products. Therefore, the work of pulling and fixing the edge portion of the upholstery requires delicate manual adjustment, and the manual work of skilled workers is indispensable in order to produce cushions with a uniform shape. In addition, with such products, there is a difference between the original shape of the corner part of the cushion core material and the shape of the corner part of the product cushion, making it difficult to design the cushion core material and achieving the desired final product shape. It takes a lot of trial and error to get it.

[0006]Furthermore, with such a configuration, it is necessary to secure a gripping allowance for towing work at the edge portion of the covering material, and after the fastening work with a tacker or the like, the gripping allowance must be must be cut and removed. Therefore,
Not only is the fabric wasted, but the number of man-hours required increases, and there is a certain limit to improving production efficiency.

[0007] Furthermore, such a cushion requires a backing plate, and there is also a problem in the degree of freedom in design.

[0008] The present invention aims to solve all of these problems.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention takes the following measures.

[0010] That is, the furniture cushion according to the present invention includes an elastic cushion core material, and an overlay that is placed on the front side of the cushion core material and whose edges are wrapped around the back side of the cushion core material. A part comprising a fabric and a sewing thread applied on a line along a loop smaller than the maximum outer diameter of the cushion core material in the wound part of the upper fabric, and which corresponds to the corner part of the cushion core material. The sewing thread in is characterized in that it is sewn by gather stitching.

[0011] In order to easily and reliably fix the top upholstery, it is preferable to adhere the top upholstery to the cushion core material with an adhesive. In order to streamline the adhesive application process, it is conceivable to use a hot melt film that is previously attached to the inner surface of the upholstery.

[0012] In order to ensure that the upholstery is wrapped around the cushion core material more reliably, reinforcing threads may be sewn into the seams formed by the sewing threads.

[0013]

[Operation] A device having such a configuration can be manufactured, for example, as follows. First, the fabric is cut using a paper pattern or the like that matches the shape of the product to obtain an upholstery. At that time, a mark line or the like is placed near the edge of the top covering, which will be the winding portion, at a position where a loop smaller than the maximum outer diameter of the cushion core material is to be formed. After that, sewing is carried out along these marked lines, etc. When sewing the parts corresponding to the corners of the cushion core material, the needle movement speed and fabric feed amount are relatively changed to create gathers. Perform sewing. Therefore, the degree of seam shortening at the part where this gather stitch is applied is
If you set the settings appropriately through experiments etc. in advance, once the loop-shaped sewing is completed, the upholstery will become bag-shaped, and the gathered stitched area will correspond to the outer surface of the corner of the cushion core material. It becomes a shape.

[0014] When the bag-shaped top fabric formed in this manner is applied to the cushion core material mainly by utilizing the elastic deformation of the cushion core material, the top fabric adheres uniformly to the outer surface of the cushion core material. As a result, the edge side of the top upholstery is wound around the back side of the cushion core material. Then, the sewing thread sewn to the wrapped part will be located on a line that follows a loop smaller than the maximum outer diameter of the cushion core material, and the excess length of the fabric that occurs at the corner part will be used to gather stitches. It can be concentrated on the edge of the fabric rather than the seam. In other words, by adjusting the wrinkles by adjusting the position of the edge of the upholstery after covering the cushion core material with the upholstery, wrinkles can be concentrated on the edge side rather than the seams, which improves the appearance of the cushion. It becomes possible to easily eliminate wrinkles at the anchor portion.

[0015] Therefore, in the case of a cushion having such a structure, the generation of wrinkles at the corner portions can be effectively prevented by appropriately setting the degree of compaction by gather stitching in advance. Therefore, there is no need for a high level of skill to work, unlike in the case of the conventional cushion core material, which requires compression deformation by hand to eliminate wrinkles, and it is relatively easy to obtain a uniform product without wrinkles. becomes possible.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a chair seat cushion will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a bottom view showing a cushion 1 of a chair seat, and the connecting structure for attaching the cushion 1 to the seat plate 2 is not shown. FIG. 2 is a perspective view showing the cushion 1 in the middle of manufacturing.

As shown in FIGS. 1 and 2, this cushion 1 includes a cushion core material 3 having elasticity, and a surface 3a of the cushion core material 3 that is covered with an edge 4a of the cushion core material 3. It is equipped with an upper covering material 4 wound around to the back surface 3b side, and a sewing thread 5 applied on a line along a loop smaller than the maximum outer diameter of the cushion core material 3 in the wound portion 4b of this upper covering material 4. The sewing thread 5a at the portion corresponding to the corner portion 31 of the cushion core material 3 is sewn by gather stitching. This top covering material 4 is adhered to the front surface 3a and back surface 3b of the cushion core material 3 using an adhesive (not shown).

The cushion core material 3 is integrally molded using urethane or the like, and has curved corner portions 31 at the four corners.

The upholstery 4 is a plain weave fabric in which the warp and weft are orthogonal, and the warp is used so that the direction of the warp and the front and back directions of the seat are approximately the same.

[0021] The sewing thread 5 is a common thread and does not have any special elasticity.

[0022] This cushion 1 is manufactured, for example, as follows. First, we start with a wooden mold and CA that correspond to the product shape.
A cutting shape is determined using D or the like, and the fabric is cut into that shape to obtain the top covering material 4. At this time, a mark line or the like is placed near the end edge 4a of the top covering 4, which will become the winding portion 4b, at a position where a loop smaller than the maximum outer diameter of the cushion core material 3 is to be formed. After that, use a gather sewing machine to sew on this mark line. During this sewing process, the corner portion 3 of the cushion core material 3
When sewing the part corresponding to 1, gather stitching is performed. Therefore, if the degree of seam compaction at the area 4c where the gather stitch is applied is set appropriately in advance through experiments, etc., the upholstery 4 will be as shown in Figs. 2 and 3 when the loop-shaped sewing is completed. As shown, the bag-shaped part 4c that has been sewn with gathers is the cushion core material 3.
The shape corresponds to the outer surface of the corner portion 31 of. In addition,
Edge 4 of the upholstery 4 in areas other than the corner portion 31
If you start sewing from point a and sew the entire circumference and then sew again so as to pass through the edge 4a of the top covering material 4, the sewing thread 5 can be sequentially sewn onto multiple top covering materials 4 without cutting it. Can be sewn.

[0023] The bag-shaped top fabric 4 made in this way is
When the cushion core material 3 is coated by utilizing the elastic deformation of the peripheral edge portion 32 of the cushion core material 3, the upholstery material 4 adheres uniformly to the outer surface of the cushion core material 3, as shown in FIGS. 1 and 4. As a result, the edge 4a side of the top covering material 4 is wound around the back surface 3b side of the cushion core material 3. The sewing thread 5 sewn to the winding portion 4b is located on a line along a loop smaller than the maximum outer diameter of the cushion core material 3, and the extra length of the fabric generated at the corner portion 31 is Sewn part 4c
The sewing threads 5a can be concentrated on the fabric edge 4a side. That is, after covering the cushion core material 3 with the top upholstery 4, by adjusting the position of the edge 4a of the top upholstery 4 and adjusting the wrinkles, the wrinkles are removed from the edge 4 rather than the sewing thread 5.
The wrinkles can be concentrated on the a side, and wrinkles in the visible portion of the cushion 1 can be easily eliminated.

[0024] Therefore, with the cushion 1 having such a structure, the generation of wrinkles at the corner portions 31 can be effectively prevented by appropriately setting in advance the degree of compaction due to gather stitching. Therefore, there is no need for a high degree of work skill, unlike in the case of conventional cushion core materials, which require partial compression deformation by hand to eliminate wrinkles, and it is relatively easy to produce uniform products without wrinkles. It can be easily obtained.

[0025] In the embodiments described above, the case where the top covering is of a continuous one-piece structure has been explained, but the present invention can also be applied to a top covering of a two-piece structure with so-called gussets. It is possible to do so.

Furthermore, in the illustrated embodiment, the peripheral edge of the cushion overhangs outward from the edge of the seat plate, but the present invention can be similarly applied to a cushion having a shape that does not overhang. Of course.

Furthermore, the present invention is applicable not only to seat cushions but also to backrest cushions or furniture cushions other than chairs.

Furthermore, in the above embodiment, the adhesive is applied to the cushion core material, and then the top layer is covered, and the entire top layer is adhered to the cushion core material. Depending on the shape, only the winding portion of the top covering may be glued. The method of adhesion is not limited to the one described above. For example, a hot melt film may be attached to the inner surface of the upholstery in advance, and the upholstery may be covered with the cushion core material to adjust wrinkles. After this is done, heat may be applied to melt the hot melt film, thereby adhering the upholstery to the cushion core.

Furthermore, the present invention can be similarly applied to cushion core materials in which a backing plate is provided on the back surface. In that case, it is possible to fix the winding part of the top upholstery to the backing plate with a tacker or the like to prevent it from shifting, but even if this fixing method is adopted, the cushion core This method is fundamentally different from conventional methods in which the material is partially compressed and deformed to tack the upholstery to the backing plate.

[0030]Although the top fabric is of course not limited to plain weave, even if a plain weave top fabric with poor vertical and horizontal elasticity is used, the corner portions will be The present invention has great significance in that wrinkles can be easily and effectively eliminated.

[0031]

[Effects of the Invention] Since the present invention has the above-described structure, it is possible to easily and effectively prevent wrinkles from forming in visible areas even when using an upholstery material with poor elasticity. be able to.

In particular, according to the present invention, there is no need to forcefully pull the upholstery to partially compress and deform the cushion core material in order to eliminate wrinkles at the corner portions. Therefore, it is possible to make the final shape of the product uniform without necessarily having to do it manually by a skilled worker. Moreover, since the original shape of the cushion core material and the final shape of the cushion product can be made substantially the same, the design of the shape of the cushion core material is also facilitated.

[0033] Furthermore, since it is no longer necessary to provide a gripping allowance on the edge of the upholstery for strong pulling, not only can fabric be saved, but the effort of cutting off the gripping allowance can also be saved. The manufacturing process can be simplified.

Furthermore, since the backing plate is no longer an essential component, the degree of freedom in design can be improved.

[Brief explanation of the drawing]

FIG. 1 is a bottom view showing one embodiment of the present invention.

FIG. 2 is a perspective view showing the same embodiment.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 2;

FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 1.

[Explanation of symbols]

1...Cushion 3...Cushion core material 3a…Surface 3b…Back side 4...Upholstery 4a...Edge 4b... Winding part 5...Sewing thread 31...Corner part

Claims (4)

[Claims] Claim 1: A cushion core material having elasticity, a top covering material that is coated on the front side of the cushion core material and whose edges are wrapped around the back surface side of the cushion core material, and a wrapping material of the top covering material. It is equipped with a sewing thread applied on a line along a loop smaller than the maximum outer diameter of the cushion core material in the winding part, and the sewing thread in the part corresponding to the corner part of the cushion core material is sewn by gather stitching. A furniture cushion characterized by: 2. The furniture cushion according to claim 1, wherein the upholstery is bonded to the cushion core material with an adhesive. 3. The furniture cushion according to claim 2, wherein the adhesive is a hot-melt film that is previously attached to the inner surface of the upholstery. 4. The furniture cushion according to claim 1, wherein a reinforcing thread is sewn into the seam formed by the sewing thread.