JPH06228850A - String having stretchability - Google Patents

Abstract

PURPOSE:To obtain a core-containing string capable of maintaining stretchability over a long period without causing deterioration of elasticity of a material used. CONSTITUTION:Tape-like outer covering cloth 3 having a function capable of shrinking at ordinary state is sewn in ring state in a sewing up part 4 on the outside of a core material 2 obtained by twisting twist yarns stretchably in the axial direction and the core material 2 is covered by the outer covering cloth 3 in a state where the sewing up part 4 is kept inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cord having a stretchable core, and more particularly to a cord having a stretchability which causes deterioration of stretch elasticity.

[0002]

2. Description of the Related Art Conventionally, a thick string, especially a core string, which has been used for clothing, daily necessities, etc., usually has a large number of twisted yarns bundled into a thick yarn bundle as a core material, and the outside thereof. A structure having a structure covered with a woven cloth cut into a tape shape is known. And, in the thick string having elasticity, the rubber thread is mainly used as the core material, and the cloth in which the rubber thread is woven is also used for the outer cloth so that the core material is knitted or braided. It is covered.

[0003]

In a conventional elastic cord having a large diameter and having such a structure, the elastic material such as a rubber thread, which is a constituent material of the string, is subjected to a load such as a tensile force due to its use. There is a drawback that elasticity is deteriorated and stretchability is lost. For this reason, conventionally, this type of elastic string has limited uses and is not used for multiple purposes.

The object of the present invention is to solve the above-mentioned problems and to provide a cord with a core which can maintain the elasticity for a long period of time without using the elastic properties of a conventional material as it is. There is.

[0005]

As a constitution for achieving the above-mentioned object, the present invention is a tape made of a cloth having a function of shrinking in a normal state on the outside of a core material in which a twisted yarn is stretched in an axial direction. It is characterized in that the outer covering cloth is loop-stitched at the binding portion and the binding portion is covered inside.

[0006]

The elastic cord of the present invention thus constructed is covered with the cloth covering cloth having the function of normally contracting the outer side of the core material which is stretchable in the axial direction. , When the core material is covered by the outer cover cloth, the contraction function given when the outer cover cloth is generated causes the core material to contract mainly in the axial direction by the amount of play of the twist, so that the core material is normally contracted. ing. When a tensile force is applied to the cord, the cord is stretched by the contracted amount of the core material and the structure of the outer cloth is expanded. As a result, the cord as a whole becomes stretchable. Since the stitching portion of the outer cloth is sewn together, the seam of the outer cloth is not fixed and can be expanded and contracted. Therefore, since it does not have an elastic material such as a conventional rubber thread, it is possible to provide a stretchable string that does not lose its stretchability due to deterioration of the material used during long-term use.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of an elastic cord of the present invention will be described with reference to the drawings. FIG. 1 is an enlarged perspective view showing a part of a stretchable cord of the present invention with a part cut away, and FIG. 2 is a view showing a mode in which a core material constituting the cord is stitched with an outer cloth. is there.

First, a stretchable cord 1 of the present invention, as shown in FIG. 1, is a rope-shaped core member 2 formed by using twisted yarns twisted by an ordinary means, and this core member 2. It is formed with the outer cover cloth 3 that covers the outside. As the core material 2, a fiber yarn made of any material such as cotton yarn, synthetic fiber yarn, and blended yarn can be used. The outer cloth 3 needs to be a stretchable cloth, and for example, a tape-like cloth having a required width of a flat knitted fabric is preferable. Various kinds of fiber threads can be used as the fiber threads constituting the tape-shaped outer cover cloth 3, but it is more preferable that the thread itself has elasticity such as a textured yarn.

A string 1 made of such a material
As shown in FIG. 2, a core material 2 having a required size is covered with a tape-like outer cloth 3 having a width dimension which is a sum of the dimensions required for wrapping the outer periphery and binding. A sewing machine 5 is used to sew the stitching portion 4 of the outer cloth 3 in a chain stitch by a sewing method using a sewing machine, and thereafter, a known trumpet (used to reverse a tape-shaped cloth to be sewn is used. It is obtained by turning over the binding portion 4 using a tool (not shown) and covering the core material 2 with the outer cover cloth 3.

In the cord 1 manufactured as described above, when the core material 2 is covered with the outer cloth 3, the rope-shaped core material 2 wrapped when the binding portion 4 of the outer cloth 3 is reversed is reversed. It acts to pull in the direction, in other words the axial direction,
The core material 2 is compressed by the play of the twist. At the same time, the binding portion 4 of the outer cover material 3 becomes bulkier than the other portions, and the contact resistance with the core material 2 increases, so that the core material 2 that is compressed in the axial direction and wrapped is not twisted. Since the reaction force that tries to return to the opposite direction by the force is blocked, the shrinkage force of the outer cover fabric 3 is predominant and the shrinkage state is maintained in the normal state. In particular, when the outer cloth 3 is a cloth knitted by using a stretchable fiber thread such as a textured yarn, the above-mentioned shrinkage effect is enhanced, and there is no difficulty.

Since the elastic cord 1 of the present invention having such a structure is contracted in a normal state, when the tensile force is applied, the expansion is mainly due to the contraction of the core material 2 as described above. However, since it is a continuous string, it will generally function as an elastic string. Further, since the stitching portion 4 of the outer cloth 3 is sewn by the sewing thread 5, the seam of the outer cloth 3 is not fixed and can be expanded and contracted. At the time of contraction, the core material 2 and all of the core material 2 are returned to their original state by the contraction force (the restoring force of the knitted fabric and the combined force of the contraction of the constituent fiber threads) as a characteristic of the cloth of the outer cover fabric 3. Therefore, as long as the fibers constituting the cord 1 are not deteriorated, the elasticity does not disappear and the cord 1 functions for a long time.

Since the elastic cord 1 of the present invention can maintain the elastic function for a long period of time by the skillful combination as described above, it is necessary to select the fabric of the outer cover fabric 3 to have an arbitrary color tone. A beautiful string can be obtained by adopting it. In addition to the circular cross section, the core 2 may have a peculiar shape by using a braid-like configuration having a rectangular cross section or a polygonal cross section. Further, since the elastic cord 1 of the present invention can be obtained by the simple manufacturing method as described above, it can be used as a material for handicrafts having a small diameter in addition to the use requiring the elastic function.

[0013]

As described above, according to the present invention, the elasticity can be obtained by the combination of the core material and the outer cloth without the characteristics of the material being used as a main component.
It is possible to obtain a product having a simple structure and capable of maintaining the expansion and contraction function for a long period of time, and it is easy to produce and economically provided.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view showing a part of a stretchable cord of the present invention by cutting out.

FIG. 2 is a view showing a mode in which an outer cloth is sewn and covered on a core material forming a cord.

[Explanation of symbols]

 1 String 2 Core Material 3 Outer Cloth 4 Stitching Part 5 Sewing Thread

Claims (2)

[Claims] 1. A tape-like outer cover cloth is sewn on the outside of a core material in which a twisted yarn is stretchable in an axial direction by a cloth having a function of contracting in a normal state, and the stitched portion is formed by chain stitching. An elastic string characterized by being covered inside. 2. The elastic string according to claim 1, wherein the outer cover cloth is a cloth knitted with a textured yarn.