JP-7857000-B2 - shoelace

Inventors

• 松田 智行
• 高橋 毅

Assignees

• 糸伍株式会社

Dates

Publication Date

20260512

Application Date

20220121

Claims (4)

1. A braided shoelace is formed by using multiple strands of yarn made from two or more threads and braiding them together in a crisscross pattern. The aforementioned ply yarn includes a first ply yarn composed of two or more threads , and a second ply yarn composed of at least two more threads than the number of threads constituting the first ply yarn. The first and second strands of the string are arranged alternately, facing the same direction, and are crossed diagonally to form a flat, hollow braided cord. It has a recess formed by the first plywood and a protrusion formed by the second plywood, and the recess and protrusion are formed by the difference in thickness resulting from the difference in the number of threads between the first plywood and the second plywood. The shoelaces are characterized in that the recessed portion and the convex portion interlock when forming a knot, making it difficult for the shoelaces to slip against each other even when tension is repeatedly applied to the knot .
2. The shoelace according to claim 1, characterized in that the yarn is a twisted yarn of aramid fibers or polyester fibers.
3. The shoelace is a flat braided shoelace with a width of 2 mm to 20 mm, as described in claim 1 or 2 .
4. The shoelace according to any one of claims 1 to 3 , characterized in that the tensile strength of the shoelace is 500 N to 1200 N.

Description

Application of Article 30, Paragraph 2 of the Patent Law: Publication on a website This invention relates to shoelaces. Shoelaces are used in many shoes to ensure a proper fit to the wearer's feet. Traditional shoelaces are made from synthetic fibers such as nylon and polyester, or natural materials such as cotton, and come in various shapes, including flat, round, and flat-round. One of the important roles required of shoelaces is their resistance to coming undone. Examples of shoelaces that are resistant to coming undone include the following: Patent Document 1 describes a cord comprising a tubular cord body made of an elastic material, having knots arranged repeatedly at intervals, the diameter of which changes depending on the magnitude of the axial tension applied to it. It is stated that this configuration provides an economical and efficient cord that is resistant to breakage and does not easily loosen or sag even without tying. Patent Document 2 describes shoelaces with a non-slip coating made of silicone rubber print to prevent the knot from coming undone. It states that the increased friction from the silicone rubber print helps to hold the knot in place and makes it less likely to come undone. Patent Document 3 describes a shoelace woven using non-stretchable yarn, characterized in that anti-slip yarns are woven into the surface of the portion that forms a knot when worn, in a scattered arrangement, and that the shoelace does not come undone or loosen while walking. Japanese Patent Publication No. 2014-12909Japanese Patent Publication No. 2021-69889Japanese Patent Publication No. 2005-52614 This is a plan view of the shoelace of the present invention.This is an enlarged plan view of the shoelace of the present invention.This is a perspective view of a lace-up shoe equipped with shoelaces according to the present invention. The shoelaces of this invention are braided cords. Braided cords are constructed by interlacing threads, and differ from woven cords obtained by weaving threads vertically and horizontally. When using woven cords as shoelaces, it is not easy to maintain both appropriate elasticity and sufficient mechanical strength to prevent breakage under heavy loads, such as those encountered in sports. In contrast, this invention uses braided cords with a predetermined structure to maintain appropriate elasticity while ensuring sufficient mechanical strength, resulting in superior durability and improved resistance to unraveling. An example of the shoelace of the present invention will be explained using Figures 1 and 2. Figure 1 is a plan view of the shoelace, and Figure 2 is an enlarged plan view of the shoelace shown in Figure 1. As shown in Figure 2, the shoelace 1 is formed in a braided shape by interlacing multiple strands of braided yarn 2. For example, the shoelace 1 has a total of 24 strands of braided yarn: 12 first braided yarns 21, each composed of 3 strands (hereinafter also called "base yarn"), and 12 second braided yarns 22, each composed of 7 strands, which is more than the number of strands that make up the first braided yarn. In this case, the shoelace 1 is formed from a total of 120 base yarns. The number of braided yarns corresponds to the number of so-called "knots" in the braid. The shoelace 1 in this example is a flat lace having a recess 3 and a protrusion 4 formed by a first plywood 21 and a second plywood 22 on its surface. More specifically, the shoelace 1 has a recess 3 formed by the first plywood 21 and a protrusion 4 formed by the second plywood 22. The shoelace 1 has a flat portion 5, which is a substantially planar portion occupying most of its surface, and a selvage portion 6 on the side of the shoelace 1, each of which has a recess 3 and a protrusion 4. Here, the shoelace 1 has the protrusion 4 further outward than the recess 3, and the protrusion 4 is raised higher than the recess 3. The plywood threads 2 intersect diagonally with other plywood threads 2 arranged in approximately perpendicular directions, but do not intersect with other plywood threads arranged in the same direction. Multiple plywood threads 2 arranged in the same direction are, for example, arranged so that the first plywood thread 21 and the second plywood thread 22 alternate in the same direction. In this case, the difference between the highest and lowest positions from the average plane of the surface irregularities of the shoelace 1 formed by the recesses 3 and protrusions 4 is maximized (the protrusion of the protrusions 4 relative to the recesses 3 is maximized), making the shoelaces less likely to slip. The ply yarn 2 is, for example, a twisted yarn made from multiple base yarns. The thickness of the second ply yarn 22 is greater than the thickness of the first ply yarn 21. The yarns constituting the first ply yarn 21 and the second ply yarn 22 are of approximately the same thickness. The base yarn is, for example, a twisted polyester yarn with a thickness of 50 count. Note that t