JPH09216506A - Fastening cord of tire antiskid device and tire antiskid device having fastening cord - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow to decide the service limit of a fastening cord simply and securely, by forming the front surface texture in a double structure of the front and the rear layers including no core structure in its cross section. SOLUTION: A belt (fastening cord) 1 furnishes a front surface texture 4 formed in a flat and small width belt form with a double structure of the front and the rear layers, by weaving a high strength of polyethylene fiber in a vertical hole bag texture, and no core texture is provided inside the cross section of the front surface texture 4. To the front surface 2 to compose one side surface of the front surface texture, one line of coloring band 3 is assembled by making its center in the width direction along the longitudinal direction. Following the generation of the abrasion and the wearing of the thickness on the rear side 5 contacting with a hook metal fitting, when the antiskid device is connected or disconnected, or the automobile is running, the rear side of the coloring band 3 provided to the other side front surface 2 becomes to be observed transparently. Consequently, the service limit of the belt 1 can be recognized visually simply and securely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tightening cord used in a tire antiskid device.

[0002]

2. Description of the Related Art FIG. 12 shows an example of a tire anti-skid device A of this type by cutting it at appropriate positions in the longitudinal direction. This anti-skid device A has a net-side main body a made of an elastic material having various mesh patterns or ladder patterns, etc.
A rope R for connecting both ends in the longitudinal direction of the non-slip device A wound around the tire T in a ring shape is held alongside. Further, a belt (clamping string) 50 for tightening the anti-skid device A toward the center of the tire T in the ring-shaped state is provided on the other side portion in the width direction of the tire T, which is directed toward the outside, via the hook metal fitting F. It can be attached.

As shown in the enlarged sectional view of FIG. 13, the belt 50 has a core structure 51 made of high-strength fiber along the longitudinal direction, and a surface structure 52 covering the core structure 51.
The surface texture 52 of the belt 50 is formed as a woven body including a warp yarn 53 made of a multifilament yarn and a weft yarn 54 made of a monofilament yarn along the longitudinal direction thereof. There is.

By the way, as shown in FIG.
When the belt 50 moves in the longitudinal direction (direction of arrow X) when the anti-slip device A is attached to or detached from the hook, the belt 50 repeatedly slides on the hook metal fitting F, and the thickness direction thereof increases. Since the belt 50 is repeatedly bent in the direction of the arrow Y, the belt 50 is likely to be worn at the surface portion and the side edge portions thereof, which may cause the belt 50 to be cut earlier.

Therefore, the applicant of the present invention has proposed a belt having a core structure coated with a surface structure made of high-strength polyethylene having excellent abrasion resistance as a filament constituting the multifilament yarn for the warp yarn 53. (Practical application 3-
No. 39446, Japanese Patent Application No. 4-62455).

[0006]

As described above, when the high strength polyethylene is used for the warp yarns 53 of the surface texture, the durability of the belt 50 is improved, but if the use is prolonged, the belt 50 will eventually wear out. The usage limit will be reached. However, in the past, the structure in which the surface structure is coated around the core structure, and since the fibers of both structures have the same color, even if the surface structure is worn and the core structure is exposed, This is difficult to recognize at a glance, and it is difficult for the user to accurately determine the usage limit of the belt (tightening cord).

Therefore, if the belt which has exceeded the limit of use is continuously used, the belt may be broken during traveling and the anti-skid device may come off. In view of such circumstances, the present invention makes it possible to easily and reliably determine the use limit of the tightening cord of the tire anti-skid device due to wear,
The purpose is to prevent the tightening cord from breaking during traveling.

[0008]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is,
The present invention is a tightening cord having a surface structure formed in a flat belt shape by weaving or knitting high-strength fibers along the longitudinal direction, and this surface structure has a core structure inside the cross section. It is characterized by being formed in a front and back two-layer structure which does not have (claim 1).

As described above, according to the present invention, since the surface texture is formed in the front and back two-layer structure having no core texture inside, when the surface texture is excessively worn by the contact with the hook metal fitting, the surface texture is removed from the worn portion. The other side can be seen through. Therefore, the use limit of the tightening cord can be detected when this phenomenon occurs. In this case, if a colored band made of fibers having a color different from that of the other parts of the surface structure is provided along the longitudinal direction on one side of the surface structure (claim 2), the coloring from the abraded portion of the surface structure becomes possible. By seeing through the band, it becomes easier to confirm the usage limit of the tightening cord.

This colored band is also useful for confirming whether or not the belt-like tightening cord is kinked when the anti-skid device is attached to the tire, so that the colored band is formed. The spun-dyed yarn may be multifilament or monofilament. The surface design of the tightening cord of the present invention can also be obtained by knitting high-strength fibers, but in order to obtain a strong tightening cord with little elongation in the longitudinal direction, a warp yarn in the longitudinal direction and a width direction It is preferable that the warp yarns are formed by weaving, and it is preferable that the warp yarns are formed of multifilament yarns of high-strength polyethylene fiber on both front and back surfaces of the surface texture (claim 3).

In this case, since the high-strength polyethylene fiber is used for the warp yarn, its durability is enhanced, and since it has no core structure, it becomes flexible and becomes hook metal fittings. It will be easier to attach it to etc. Further, when high-strength polyethylene fibers are used for the warp threads of the woven surface texture, the belt-shaped surface texture does not substantially extend in the belt longitudinal direction even without the core texture, and the tightened state is reliably maintained.

Further, of the front and back surfaces of the surface design, the warp yarns on one side may be composed of multifilament yarns of high-strength polyethylene fiber, and the warp yarns on the other side may be composed of monofilament yarns. ). In this case, one side of the surface texture is composed of a multi-filament thread of high-strength polyethylene fiber to ensure the non-stretchability and tensile strength of the tightening string, and a monofilament thread is used on the other side of the expression texture. This makes it difficult for the other surface side to freeze, and facilitates the work of attaching / detaching the anti-skid device for tires during ice and snow.

Further, the present invention has a surface structure formed into a flat belt-like double-sided double-layer structure by weaving or knitting high-strength fibers along the longitudinal direction. Inside the cross section of the tissue, different color fibers composed of fibers of different colors from the same tissue are provided (Claim 5). In this case, if the wear of the surface structure progresses excessively due to the contact with the hook metal fittings, the different-colored fibers fly out from the worn part, so by visually observing the different-colored fibers, the usage limit of the tightening cord can be determined. You will be able to detect.

The present invention is not limited to a cord made of non-stretchable fibers, but can be applied to a rubber cord which is elastic in the longitudinal direction. In this case, the rubber cord is made of a plurality of different colors. It may be formed in a cross section in which rubber layers are laminated (claim 6).
Also in this case, when the rubber layer wears excessively due to the contact with the hook metal fitting, the rubber layer of a color different from the worn rubber layer is exposed to the outside, and the rubber layer of the different color is visually confirmed. , It becomes possible to detect the use limit of the tightening cord.

Among the above-mentioned tightening cords, in the case of a tightening cord made of non-stretchable fiber, it is hooked on both ends in the width direction of the net main body or both ends thereof via hook metal fittings or the like. When the tire is stopped, it is mounted on the tire anti-skid device (claim 7). In this case, on the inner side of the net body in the width direction (inner side of the tire), the tightening cord is usually fixed in advance to the edge portion of the net body by caulking the hook fitting. On the other hand, on the outer side in the width direction of the net body (outer side of the tire), the tightening cord is separated from the net body, and is used by being hooked on the hook metal fitting when it is attached to the tire.

Further, in the case of a tightening cord made of a rubber cord material, it is attached to the anti-skid device for a tire by being hooked on the widthwise outer end of the net body through a hook metal fitting or the like. Item 8). In this case, the rubber cord is separated from the net body and is used by hooking it on the hook metal fitting when it is attached to the tire.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention. Belt (tightening cord) 1 of this embodiment
Has a surface texture 4 formed into a flat narrow belt having a two-layer structure on the front and back sides by weaving a high-strength polyethylene fiber described later in a warp knitted texture.
Unlike the conventional one, the core tissue (Fig.
(Corresponding to the reference numeral 51) is not provided.

Then, on the surface portion 2 constituting one surface side of the surface texture 4, a line of colored strips 3 is incorporated with its widthwise central portion along the longitudinal direction. Belt 1
When the anti-skid device (not shown: see FIG. 10) is attached to the tire, as shown in FIG. 3, the surface portion 2 having the colored band 3 faces outward in the tire radial direction (upward in FIG. 2). Thus, the back side 5 on the back side is used in a state of contacting the hook fitting F.

The appearance of the colored strips 3 in the same direction (inner diameter of the tire) on the entire circumference of the tire 1 confirms that the belt 1 is not kinked. It is important to improve the fit of the anti-skid device to the belt and extend the life of the belt 1. The narrow belt 1 has a high-strength polyethylene fiber (for example, "Dyneema" manufactured by Toyobo Co., Ltd.) on at least the back surface 5 which is the contact side with the hook fitting F as warp threads 8 along the longitudinal direction. Etc. are used, and as the weft yarn 9, a nylon monofilament or the like is used, and the warp yarn 8 and the weft yarn 9 are plain-woven.

In this embodiment, as shown in FIG. 1, the edge portion is over-sewn with the same thread as the weft thread 9 to form a hollow weave structure. The colored band 3 is formed by weaving the primary yarn 10 and the like along the widthwise direction of the surface portion 2 so as to extend between the vertical yarns 8 made of high-strength polyethylene fiber. This spun-dyed yarn 10 is made of a multifilament yarn such as nylon or polyester which can be colored in order to cope with the difficulty or inadequacy of coloring (semi-dyed) the high strength polyethylene fiber.

The colored band 3 is colored in a color different from the other fiber parts (high-strength polyethylene fibers) of the narrow belt 1, and the front surface 2 is seen through from the worn part of the back surface 5 as described later. When this is done, the colored band 3 is colored in a color that is transparent and easy to see. In this embodiment, the high-strength polyethylene fibers that make up the majority of the surface texture 4 are white,
The primary yarn 10 forming the colored band 3 is colored with a low lightness such as dark green or black.

That is, in order to make it easy to see through the colored band 3 from the worn portion of the belt 1, the warp yarn 8 on the side that contacts the hook metal fitting F is made a light color with a high lightness, and the colored band 3 on the back side is colored. It should be a dark color with low brightness. Nylon monofilament or the like can be used for the thread used for the overedging stitch 6.

In the belt 1 having the above-mentioned structure, when the anti-skid device is attached to or detached from the tire, or when the automobile is running, the back surface portion 5 that comes into contact with the hook fitting F is abraded as shown by a thick line in FIG. As the wall thickness is worn out, the back side of the colored strip 3 provided on the other surface portion 2 can be seen through the worn portion 5a. In FIG. 4, the degree of wear is drawn slightly larger than it actually is in order to facilitate understanding.

Therefore, the user W can easily and surely visually check the use limit of the belt 1 due to the phenomenon that the colored band 3 of the front surface portion 2 can be seen through from the worn portion 5a of the back surface portion 5. I can know. FIG. 5 shows a modification of the belt 1 according to the first embodiment. The belt 1 in this case is a warp yarn 8 made of high-strength polyethylene fiber.
In addition, by making the diameter of each of the spun yarn 10 for the colored band 3 thicker, the thickness is made as thick as a conventional belt having a core structure.

For this reason, as shown in FIG. 6, in the tightening device 20 provided at one end or both ends of the belt 1, a claw tool for fixing the belt (not shown, but inside the case body 21). It is possible to engage with a buckle that is engageable by a spring with respect to the belt 1 passing through in a U-turn shape. In FIG. 6, reference numeral 22
Is a hook member for connecting both ends in the longitudinal direction of the anti-slip device wound around a tire in a ring shape, and 23 is an elastic member such as a rubber cord for applying a tensile force to both ends of the belt 1. is there.

FIG. 7 shows a belt 1 according to the second embodiment of the present invention. In the belt 1, unlike the first embodiment, the warp yarns 8 forming the surface portion 2 of the surface texture 4 are formed.
A monofilament yarn made of nylon or polyester is used as A, and a high-strength polyethylene fiber multifilament yarn is used only as the vertical yarn 8B that constitutes the back surface portion 5 of the surface structure 4 that abuts on the hook fitting F.

On the contrary, the belt 1 can be used with the surface portion 2 made of nylon or polyester monofilament thread as the sliding surface side which abuts the hook fitting F. Further, in the center portion in the width direction of the surface portion 2 of the surface texture 4, there are woven a plurality of monofilament yarns 10 of different colors from the other monofilament yarns. The colored band 3 is composed of 10.

In this embodiment also, the spun yarn 1
0 is colored in dark green or black, and the warp yarns 8A and 8B other than the primary yarn 10 are all white. Also,
Similar to the first embodiment, the surface texture 4 has a two-layered structure having no core texture inside the cross section.
Therefore, also in the present embodiment, the use limit of the belt 1 can be easily and surely visually confirmed by the phenomenon that the colored band 3 of the front surface portion 2 can be seen through from the worn portion 5a of the back surface portion 5. You can

Further, according to the present embodiment, since one surface of the surface texture 4 is composed of the high-strength polyethylene fiber multifilament yarn, the non-stretchability and the tensile strength of the belt 1 are secured in this portion. At the same time, since the other surface of the surface texture 4 is made of a monofilament yarn in which moisture is less likely to penetrate than the multifilament yarn, the belt 1 is prevented from becoming rigid due to freezing, and the tire anti-skid device during ice and snow is prevented. It is easy to attach and detach.

On the other hand, in the first and second embodiments described above, since the belt 1 has a cross-sectional structure composed of the front and back two-layered surface texture 4 having no core structure, the belt 1 has a core structure only to the extent that there is no core structure. Since the flexibility is increased and it is easy to bend, there is an advantage that it can be easily hooked on the hook fitting F and the work of mounting the tire on the tire can be facilitated. However, in order to put the belt 1 having a cross-sectional structure without a core structure into practical use, it is necessary to secure sufficient durability without the core structure.

[0031]

EXAMPLE Therefore, an experiment was conducted to verify the durability of the belt 1 of the first and second embodiments. Hereinafter, this experiment will be described. (First Test Piece) First, a test piece of the belt 1 according to the first embodiment of the present invention was created.

That is, as warp threads 8 made of high-strength polyethylene fiber, 45 pieces of 1200 denier under the trade name "Dyneema" manufactured by Toyobo Co., Ltd. were used.
2. A nylon multifilament having the same diameter as that of the warp yarn 8 is used as the primary dyeing yarn 10 for the colored band, and a weft yarn 9 is used as 3.
Woven using No. 3 nylon monofilament. A flat belt-shaped test piece 1 having a width of 8 mm and a length of 150 mm having a warp-woven structure was prepared from this narrow belt. The thread for overlock stitching is the same as the weft thread 3.
A No. 3 nylon monofilament was used.

(Second and Third Test Pieces) Next, test pieces of the belt 1 according to the second embodiment of the present invention were prepared. The test pieces 2 and 3 in this case were 1600 in the above-mentioned “Dyneema” as the warp threads 8B constituting one surface side of the surface texture 4.
Twenty-two denier yarns were hammered in, and as warp yarns 8A constituting the other side of the surface texture 4, 28 nylon monofilaments of No. 4.2 were hammered in.
The weft thread 9 and the nylon monofilament of No. 3.3 were woven as threads for overedging.

From this narrow belt, a flat belt-shaped test piece having a width of 8 mm and a length of 150 mm having a warp weave structure was prepared. Of these test pieces, the case where one surface side made of high-strength polyethylene multifilament yarn is brought into contact with the hook metal fitting F and mounted on the test device is referred to as a second test piece. The third test piece was prepared by bringing the other surface side of the test piece into contact with the hook fitting F and mounting it on the test apparatus.

(Fourth Specimen) On the other hand, among the above-mentioned belt specimens of the present invention, a warp yarn 8 (4) made of high-strength polyethylene fiber
A belt test piece was manufactured in the same manner as the above-mentioned first test piece except that 5) were replaced with 1260 denier nylon multifilament (50 pieces), and this was used as a fourth test piece.

(Fifth Test Specimen) Further, among the above-mentioned belt test specimens of the present invention, a warp yarn 8 (4) made of high-strength polyethylene fiber is used.
A belt test piece was manufactured in the same manner as the above-mentioned first test piece except that 5 pieces) were replaced with 1500 denier polyester multifilaments (50 pieces), and this was used as a fifth test piece.

Each of these five kinds of belt test pieces was rubbed with the hook metal fitting F while sliding at a load of 20 kg and a stroke of 10 mm and 300 times per minute. It was attached to and subjected to a durability test. It should be noted that each test piece was always kept in a predetermined water-containing state by a water dropping device in order to bring it closer to an actual running environment.

Table 1 shows the results of observing the state of each test piece 2 hours, 5 hours, and 10 hours after the start of the test.

[0039]

[Table 1]

In the table, "○" indicates that the surface condition of each test piece was not significantly changed, and "△" indicates that about half of the filaments constituting the multifilament yarn were cut. It means that the test piece itself was cut. As is clear from Table 1, in the case of the first and second test pieces in which the multifilament yarn of high-strength polyethylene fiber (Dyneema) is used as the vertical yarn 8 constituting the sliding surface with the hook fitting F, The surface condition does not change even after 10 hours, while the fourth test piece using nylon multifilament for the vertical thread 8 constituting the sliding surface and the polyester for the vertical thread 8 are used. In the fifth test piece using the multifilament, about half of the fibers were cut after 5 hours and 1
The test piece is cut after 0 hour.

Therefore, when the sliding surface with the hook fitting F is made of multifilament yarn, it is understood that the high-strength polyethylene fiber has the most excellent abrasion resistance (durability). On the other hand, in the case of the third test piece in which the nylon monofilament thread is used for the vertical thread 8 forming the sliding surface with the hook fitting F, there is no particular change in the surface state even after 10 hours, It can be seen that abrasion resistance is improved by adopting monofilament yarn even if it is made of the same nylon.

In the belt 1 according to the modified example of the first embodiment shown in FIG. 5, in order to make the belt thickness equal to that of the conventional belt, the warp yarn 8 made of high-strength polyethylene fiber having a denier of 1600 is used. It is known that the purpose can be achieved by using 40 pieces. Then, the same durability test as described above was performed on this product, and the result was equal to or higher than that of the first test piece.

The present invention is not limited to the above first and second embodiments. For example, the belt 1 is not limited to being formed by weaving, but may be formed by braiding. Further, the colored band 3 can be provided not only at one location in the width direction of the belt 1 but also at multiple locations. Further, the number of the original dyed yarns 10 used for forming the colored band 3 is not limited in any way.

However, from the viewpoint of abrasion resistance, it is preferable to use the number of warp yarns 8 made of high-strength polyethylene fiber as much as possible. The number etc. can be naturally limited. The weft yarn 9 and the spun yarn 10 are not limited in their material, thickness, color, pattern, yarn structure (difference between monofilament and multifilament) and the like. Further, the colored band 3 may be provided intermittently in the belt longitudinal direction.

Then, by stacking a plurality of narrow belts and integrating the plurality of narrow belts by adhesion or sewing, the belts can be made thicker and the engagement with the buckle is ensured. be able to. in this case,
Of the narrow belt, use the one on the back side with a large diameter,
It is advantageous in terms of wear resistance to use the one having a small diameter on the front side. However, it is also possible to use a plurality of belt constituent materials (polyethylene) that are superposed and integrated and have the same diameter.

In the anti-skid device, the configuration and the like other than the belt 1 (for example, the shape of the device main body and the configuration of the tightening device provided at one end or both ends of the belt 1) are not limited. Further, the belt 1 is used not only for tightening the widthwise outer end (outer side of the tire) of the net body a of the anti-skid device but also as a tightening string for tightening the inner end in the same direction (inner side of the tire). be able to.

8 and 9 show a third embodiment of the present invention. The belt 1 in this case also has a surface texture 4 formed into a flat belt-like two-layer structure by weaving or knitting high-strength fibers along the longitudinal direction,
It is common to the first and second embodiments. However, in the present embodiment, instead of weaving the colored band 3 in the surface texture 4 itself, inside the cross section of the surface texture 4 of the front and back two-layer structure,
This is different from the first and second embodiments in that different-color fibers 11 made of fibers of different colors from the same tissue 4 are provided.

In this embodiment, as warp threads 8 of the surface texture 4, two 1200 denier high-strength polyethylene fibers (dyneema) are twisted together, and 24 twisted fiber bundles (multifilaments) are used. The color of this fiber bundle is white. On the other hand, the different color fiber 11 in the cross section uses four 1500-denier polyester multifilament yarns, and the color of these yarns is red.

As described above, since the different-colored fibers 11 are driven into the inside of the cross section of the surface texture 4, the belt 1 in FIG. 8 cannot be said to be a coreless belt in a strict sense, but compared with the surface texture 6. And the fiber amount of the different color fiber 11 is extremely small,
The different-color fibers 11 themselves do not function as a member responsible for the tensile strength of the belt 1. Belt 1 of this third embodiment
According to this, when the worn portion 5a is generated in the sliding portion of the belt 1 with respect to the hook metal F, the different-color fibers 11 are exposed to the outside in a fluffy state as shown in FIG. By checking, the usage limit of the belt 1 can be detected.

Further, in the belt 1 of this embodiment, since the high-strength polyethylene fiber is used for the warp yarn 8 of the surface texture 4, and the fiber amount is almost the same as that of the first test piece, the tensile strength is In terms of wear resistance, it is sufficiently practical. The warp yarns 8 of the surface texture 4 are not limited to high-strength polyethylene fibers, and nylon or polypropylene multifilament yarns or multifilament yarns may be adopted as in the case of the first and second embodiments. You can

FIG. 10 shows a fourth embodiment of the present invention. As shown in the figure, in this embodiment, as a tightening string for tightening the edge portion of the net body a of the anti-skid device A toward the tire center side on the outside of the tire T, an endless ring-shaped rubber elastic in the longitudinal direction is used. The string material 31 is adopted.
This rubber cord material 31 is formed into a circular solid cross section having an inner-outer double structure by covering the outer circumference rubber layer 33 around the core rubber layer 32 inside the cross section.
Are colored in different colors.

In the production of the rubber cord material 31 having such an inner / outer double structure, the unvulcanized rubbers of different colors are simultaneously extruded from the die holes formed in the inner / outer double, and then the extruded unvulcanized rubber is added. It can be carried out by placing it in a vulcanization mold and vulcanizing it. Further, the outer peripheral rubber layer 33 is colored in the same black color as the tire T because it is necessary to add carbon black as a reinforcing material in order to minimize abrasion caused by rubbing with the hook fitting F. On the other hand, the core rubber layer 32 is added with a high-hardness and white filler such as silica, hard clay, and calcium carbonate, whereby the reinforcing effect of the core rubber layer 32 and the effect of discriminating against black color are obtained. It is possible to satisfy both requests.

Since it is difficult to eccentrically dispose the core rubber layer 32 in terms of manufacturing, the core rubber layer 32 is disposed at the center of the cross section of the rubber cord 31 as shown in FIG. The outer diameter of the rubber cord 31 is usually 6 to 8 mm, and the diameter of the core rubber layer 32 in that case may be set to about 1/4 to 1/3 of the outer diameter. According to the present embodiment,
When the black outer peripheral rubber layer 33 is excessively worn due to the contact with the hook metal fitting F, a different white-colored core rubber layer 32 is exposed to the outside, and the core rubber layer 32 is visually confirmed. It is possible to detect the usage limit of the rubber string material 31.

On the other hand, FIGS. 11A to 11C show modified examples of the cross-sectional shape of the rubber cord 31. this house,
In FIG. 11A, the rubber cord material 31 is formed in a flat belt shape, and has a flat cross-sectional structure in which the entire circumference of the thin rubber plate-shaped core rubber layer 32 is covered with the outer peripheral rubber layer 33. .

On the other hand, FIG. 11B shows a laminated cross-sectional structure of two front and back layers in which a belt-shaped front rubber layer 34 and a back rubber layer 35 having the same thickness are laminated. Three
5 is colored differently from each other. Again, in this case,
For example, the usage limit can be detected when the back rubber layer 35 is worn and the front rubber layer 34 is exposed. In addition, FIG.
As shown in (c), an inner rubber layer 37 different in color from the outer rubber layer 36 may be laminated between the outer rubber layers 36 on the front and back sides to form a sandwich structure.

The rubber cord material 3 shown in FIGS. 11 (a) to 11 (c) is used.
In Fig. 1, since it is formed into a flat belt shape,
Compared with the rubber cord material 31 having a circular cross section shown in FIG.
Since the contact area with respect to is wide and is less likely to wear, there is an effect that durability can be improved.

[0057]

As described above, according to the present invention,
Since the use limit of the tightening cord of the tire anti-skid device due to wear can be determined easily and reliably, it is possible to prevent the tightening cord from breaking during traveling.

[Brief description of drawings]

FIG. 1 is an enlarged plan view of a belt according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the belt.

FIG. 3 is a cross-sectional view showing a state in which the belt is engaged with a hook fitting of the anti-skid device.

FIG. 4 is an enlarged cross-sectional view showing a state where the back surface portion of the belt is worn.

FIG. 5 is an enlarged cross-sectional view showing a belt according to a modified example of the first embodiment.

FIG. 6 is a front view showing an example of a belt tightening device.

FIG. 7 is an enlarged plan view of a belt according to a second embodiment of the present invention.

FIG. 8 is an enlarged plan view of a belt according to a third embodiment of the present invention.

FIG. 9 is a perspective view showing a worn state of the belt.

FIG. 10 is a perspective view of a tire equipped with an anti-skid device for showing a usage state of a rubber cord according to a third embodiment of the present invention.

FIG. 11 is an enlarged cross-sectional view showing a modified example of the cross-sectional shape of the rubber cord material.

FIG. 12 is a perspective view showing an example of an anti-skid device by cutting at an appropriate position in a longitudinal direction.

FIG. 13 is an enlarged cross-sectional view showing a conventional belt.

FIG. 14 is a perspective view for explaining a situation where wear occurs in a conventional belt.

[Explanation of symbols]

 1 Belt (Clamping String) 2 Surface Part 3 Colored Band 4 Surface Texture 5 Back Part 8 Vertical Thread 9 Weft Thread 11 Different Color Fiber 31 Rubber String Material (Clamping String) 32 Core Rubber Layer 33 Outer Rubber Layer 34 Front Rubber Layer 35 Back rubber layer 36 Outer rubber layer 37 Inner rubber layer

Claims (8)

[Claims] 1. A surface texture (4) formed into a flat belt shape by weaving or knitting high-strength fibers along the longitudinal direction, and this surface texture (4) has a core texture ( 51) A tightening cord for a tire anti-skid device, characterized in that the tightening cord is formed in a two-layer structure on the front and back without having 51). 2. A coloring band (3) made of fibers of a different color from the other parts of the surface texture (4) is provided on one surface side of the surface texture (4) along the longitudinal direction. A tightening string for the anti-skid device for a tire as described. 3. The surface texture (4) is constituted by weaving a warp yarn (8) in the longitudinal direction and a weft yarn (9) in the width direction, and the surface texture (4) is formed on both front and back surfaces of the surface texture (4). The tightening cord for a tire anti-skid device according to claim 1 or 2, wherein the warp yarn (8) is made of a high-strength polyethylene fiber multifilament yarn. 4. The surface texture (4) is constituted by weaving a warp yarn (8) in the longitudinal direction and a weft yarn (9) in the width direction, and the surface texture (4) is The anti-skid device for a tire according to claim 1 or 2, wherein the warp yarn (8) on one surface side is a multifilament yarn of high-strength polyethylene fiber, and the warp yarn (8) on the other surface side is a monofilament yarn. Tightening string. 5. A surface structure (4) formed by weaving or knitting high-strength fibers along the longitudinal direction into a flat belt-like structure of front and back two-layer structure, and the surface structure of this front and back two-layer structure. A tightening string for a tire anti-skid device, wherein different color fibers (11) made of fibers of different colors from the same structure (4) are provided inside the cross section of (4). 6. A rubber cord material (31) which is elastic in a longitudinal direction.
The tightening cord for a tire anti-skid device, wherein the rubber cord material (31) is formed in a cross section in which a plurality of rubber layers (32 to 37) of different colors are laminated. 7. The tightening cord (1) according to any one of claims 1 to 5 is hooked on both inner and outer ends in the width direction of the net body (a) or one end thereof. Anti-skid device for tires. 8. A tire anti-skid device, characterized in that the rubber cord material (31) according to claim 6 is hooked on the widthwise outer end of the net body (a).