JPS5917325Y2 - Gatsuto - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of strings made of synthetic resin fibers that are used for tennis, badminton, squash, etc. rackets. By wrapping the outer layer yarns of different thickness around the core yarn formed with The strength of the central part is increased by forming small-diameter gut parts at the corners, and the action of the small-diameter gut parts at the corners effectively imparts a repulsive force to the gut surface, and furthermore, the strength of the central part is increased over the entire surface of the gut. It is an object of the present invention to provide a string which increases the effect of preventing the ball from slipping when hitting the ball by forming uneven stripes, and also prevents wear caused by contact between the strings at the intersection of the warp and weft. There is something to do.

To explain the embodiment of the present invention with reference to the drawings, 1 is a core yarn made of synthetic resin such as nylon monofilament, and a large diameter portion 1a
and the small diameter portion 1b are integrally formed via the tapered portion 1C,
Around its outer periphery, a plurality of synthetic resin outer layer threads 2 and 3 such as nylon monofilament of different thickness are aligned and wound in a spiral shape.
By surrounding them and integrally fixing them to the core yarn 1 with an appropriate adhesive, both the large diameter outer layer yarn 2 and the small diameter outer layer yarn 3 are attached to the outer peripheral surface of the core yarn 1 in the large diameter portion 1a of the core yarn 1. The large diameter outer layer yarn 2 protrudes from the small diameter portion 1b of the core yarn 1, and only the small diameter outer layer yarn 3 is directly wound tightly around the outer circumference of the core yarn 1. 2 is wound around the outer circumferential surface of the small-diameter outer layer yarn group 3a arranged closely in parallel.

The arrangement state of the outer layer yarns 2 and 3 is such that one or several large diameter outer layer yarns 2 and a large number of small diameter outer layer yarn groups 3a are alternately arranged in parallel and wound around the core yarn 1 to form a large diameter outer layer yarn. 2 is 120° or 18
It is desirable that they be arranged at relatively large angular intervals, such as 0°.

Also, the diameter of the large diameter outer layer yarn 2 is 1.2 to 1.2 of the diameter of the small diameter outer layer yarn 3.
A suitable value is 3.5 times, preferably 1.5 to 2.5 times.

In the above example, one layer of outer layer yarn was provided around the core yarn 1, but another outer layer yarn was wound between the core yarn 1 and the outer layer yarns 2 and 3 to form two layers. Alternatively, the core yarn 1 and the outer layer yarn may be either solid or hollow fibers depending on whether practical strength or feel at impact is important.

As described above, the present invention involves winding a plurality of synthetic resin outer layer yarns 2 and 3 of different thicknesses in a spiral shape around a synthetic resin core yarn 1 having a large diameter portion 1a and a small diameter portion 1b. As a result, both the large-diameter outer layer yarn 2 and the small-diameter outer layer yarn 3 are tightly wound around the outer peripheral surface of the core yarn 1 in the large diameter portion 1a of the core yarn 1, and the small diameter portion 1b of the core yarn 1 is wrapped tightly. In this case, small diameter outer layer yarn group 3
Since this relates to a string made up of a large-diameter outer layer yarn 2 wound around the outer peripheral surface of a core yarn 1, the core yarn 1 has a large-diameter portion 1a and a small-diameter portion 1b.
As shown in FIG. 5, the racket is stretched so that when it is stretched around the racket, a large-diameter gut part 1a is formed at the center of the racket, and a small-diameter gut part 1b' is formed at the corner. In addition to increasing the strength of the central part, the small-diameter gut parts at the corners impart effective repulsive force to the gut surface, and the core yarn 1 is surrounded by multiple outer layer yarns of different thicknesses. 2
, 3 to form uneven stripes over the entire surface of the string, the small diameter outer layer yarn 3 is formed at the intersection of the warp and weft.
The concave portion formed by the large diameter outer layer yarn 2 meshes with the convex portion formed by the large diameter outer layer yarn 2 to prevent the occurrence of misplacement, and also prevents the ball from slipping when hitting the ball over the entire surface of the gut. In particular, in the small-diameter gut portion, the large-diameter outer layer yarn 2 is wrapped around the outer peripheral surface of the small-diameter outer layer yarn group 3a, and the degree of surface unevenness is expanded. This will encourage the above-mentioned tendency and produce great effects.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a partial front view, FIG. 2 is a vertical front view, FIG. 3 is an enlarged sectional view taken along line A-A in FIG. 2, and FIG. 4 is a partial front view. 2 is an enlarged sectional view taken along the line BB in FIG. 2, and FIG. 5 is a front view of the racket in a state where it is stretched. 1...Synthetic resin core yarn, 1a...Large diameter portion, 1b...Small diameter portion, 2...Large diameter outer layer yarn, 3... ...Small diameter outer layer yarn, 3a...Small diameter outer layer yarn group.

Claims (1)

[Claims for Utility Model Registration] ■ A plurality of threads of different thickness are arranged around the synthetic resin core thread 1, which has a large diameter part 1a stretched in the center of the racket and a small diameter part 1b stretched in the corners. By aligning the synthetic resin outer layer yarns 2 and 3 and winding them in a spiral, the large diameter portion 1 of the core yarn 1 is
In a, both the large diameter outer layer yarn 2 and the small diameter outer layer yarn 3 are tightly wound around the outer peripheral surface of the core yarn 1, and the small diameter portion 1 of the core yarn 1 is wound tightly.
In b, a string is formed by winding the large diameter outer layer yarn 2 around the outer peripheral surface of the small diameter outer layer yarn group 3a. ■ Utility model registration claimed in claim 1, in which a large number of small diameter outer layer yarns 3a and one to several large diameter outer layer yarns 2 are arranged alternately and wound around the core yarn 1. Gatsuto.