JPH0530481Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a synthetic rubber anti-slip net that is attached to automobile tires to prevent slips on snowy roads, etc.

"Prior art" Figure 4 shows a typical anti-slip net for tires 1.
FIG. 3 is a front view showing a state in which the vehicle is mounted on a tire.

The net 1 is integrally formed in a mesh band shape from synthetic rubber, and hooks 2 are attached to the ends located on both sides of the tire outer circumferential surface. And these hooks 2...
The tire is attached to the tire by being hooked onto an annular elastic ring 3 arranged concentrically with the tire.

"Problems to be solved by the invention" By the way, although the anti-slip net 1 for tires has the advantage of generating less noise compared to metal anti-slip chains,
It is not as good as metal chains in terms of breaking strength, etc.
The drawback was that it had a short lifespan.

Therefore, in order to improve the breaking strength of the net and extend its lifespan, nets have been manufactured that have a core made of a resin wire such as polyamide or polyester and whose outer periphery is coated with synthetic rubber.
In order to obtain a sufficient strength improvement effect, the core needs to be relatively thick (for example, 3 mm or more), and the lack of flexibility of the core makes the net stiff, making it difficult to attach and detach from the tire. .

Therefore, the inventors of the present invention conducted a detailed study on the rupture of the core and found that the rupture of the core within the anti-slip net for tires occurs when shearing force is applied at the same time as tensile force. Ta. In other words, conventional resin cores have sufficient tensile strength but low shear strength, so they are prone to breakage due to unevenness on the road surface or shearing force caused by spike teeth fixed to the net.

``Purpose of the invention'' The present invention was made in view of the above circumstances, and the purpose is to provide an anti-slip net for tires that has high breaking strength, has a long life, and can be easily attached to and removed from tires. do.

``Means for solving the problem'' The anti-slip net for tires of the present invention is a non-slip net for tires that is formed into a mesh belt shape from a plastic material such as synthetic rubber and is attached to the outer circumferential surface of the tire. A core body is disposed inside the mesh portion over its entire length, and these core bodies are made of a plurality of stranded composite wires made by tightly winding a metal wire around a resin center wire. The outer circumferential surface of each core body is tightly bonded to the plastic material.

"Embodiments" Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partially cutaway plan view showing the main parts of an anti-slip net for tires according to an embodiment.

In the figure, reference numeral 10 denotes a net body formed into a band-like mesh with a plastic material such as synthetic rubber (the overall shape is the same as the conventional one). A core body 12... formed by twisting a plurality of composite wire rods 11... is embedded in the portion of the core body 1.
2... are in close contact with the plastic material forming the net body 10. In addition, within each intersection portion 10A of the mesh of the net main body 10, two core bodies 12, 12 are provided.
are intersecting.

Further, spike pieces 13 are embedded in each of the mesh intersection portions 10A so that one end thereof is exposed. As shown in FIG. 2, this spike piece 13 is composed of a cylindrical spike tooth 14 made of cemented carbide and a rivet 15 that fixes the spike tooth 14 to the core body 12. It is. The center hole 14A of the spike tooth 14 is
The spike teeth 14 are formed to have a diameter increasing toward the exposed end side. On the other hand, the rivet 15
is a disk portion 15 having approximately the same diameter as the outer diameter of the spike tooth 14.
A, the tip of the rivet 15 is inserted between the composite wires 11 by partially loosening one of the two intersecting cores 12, 12, and Center hole 14A of spike tooth 14
It is inserted into and crushed inside. As a result, the spike tooth 14 has a lower end surface (in FIG. 2).
The composite wire rod 11 is sandwiched and fixed between the disk portion 15A of the rivet 15 and the disk portion 15A of the rivet 15. Also,
The other core body 12 to which the spike piece 13 is not fixed
is in contact with and supports the lower surface of the disk portion 15A of the rivet 15 (see FIG. 2).

As shown in FIG. 3 (enlarged view), the composite wire 11 has a diameter of 1.5 mm made of relatively flexible resin such as polyester, tetron, polyurethane, polyamide, etc. before being buried in the net main body 10.
It consists of a center wire 16 of about 100 mm in diameter, a resin thread 17 wound around the outer periphery of the center wire 16, and a stainless steel wire 18 of about 0.08 mmφ wound on top of the resin thread 17. The resin thread 17 is for fixing the stainless steel wire 18 so that it does not shift along the surface of the center wire 16, and is melted when the net main body 10 is press-molded, so that the stainless steel wire 18 and the center wire 16 are bonded together. It is desirable that it be made of a material that can be bonded.

To manufacture such an anti-slip net for tires, first, spike pieces 1 are placed at predetermined positions on the core body 12.
3. Fix... Next, a synthetic rubber material is filled into the mesh forming groove formed in the press mold (not shown), and the spike pieces 13 are placed on top of the synthetic rubber material.
A core body 12 to which is fixed is housed, and a synthetic rubber material is further filled thereon and press molding is performed.

The core body 12 used in this anti-slip net for tires is a bundle of composite wire rods 11 made by winding a stainless steel wire 18 around the outer periphery of a center wire rod 16.
can be protected, and its breaking strength is extremely high.
Therefore, compared to the core made only of resin used in conventional nets, sufficient strength can be obtained with a smaller diameter, and the stretchability and flexibility of the core can be improved. For this reason, the anti-slip net for tires of this example has higher breaking strength and a longer service life than conventional nets, and is also highly flexible and can be easily attached and detached from tires. You can get the same effect.

Further, the spike teeth 14 made of cemented carbide of the spike pieces 13 embedded in each intersection portion 10A of the meshes...
This increases the frictional resistance between the net and the road surface,
The anti-slip effect can be greatly improved. Further, the spike teeth 14 are arranged at each intersection point 1 of the mesh.
In 0A, one of the crossed core bodies 12 is fixed by a rivet 15, and the rivet 15 is supported by the other core body 12, so even if this net is used for a long time, This prevents the spike piece 14 from breaking through the back surface of the net body 10 and damaging the tire.

In addition, in the anti-slip net for tires of the above embodiment, the spike pieces 13 were provided, but in the present invention, it is not necessarily necessary to provide the spike pieces.

Further, the number of composite wire rods 11 constituting the core body 12 may be increased or decreased as necessary.

``Effect of the invention'' According to the anti-slip net for tires according to the invention, since the composite wire constituting the core has metal wires tightly wound around the outer periphery, this metal wire increases the shear strength of the core. , and sufficient breaking strength can be obtained with a smaller diameter than the resin core used in conventional anti-slip tire nets. Nevertheless, the metal wire wound around the outer periphery of the composite wire does not inhibit the elasticity of the center wire, so the core can expand and contract following the expansion and contraction of the plastic material, increasing the flexibility of the net. In addition to being high and easy to install, stress is less likely to be generated at the bonding interface between the core and the plastic resin, and the core is less likely to peel off from the plastic resin.

Additionally, a groove extending in the longitudinal direction of the core is formed between the multiple twisted composite wires, and a groove extending in the circumferential direction of the core is formed between the metal wires wound around each composite wire. Since these two types of grooves extending in directions perpendicular to each other engage with the plastic material and prevent longitudinal movement and rotation of the core, there is no risk of the core shifting relative to the plastic material. Therefore, in addition to being difficult to peel off, the core does not move in the plastic material under load, so there is no risk of the core rubbing against the plastic material from the inside and damaging it.

That is, according to the anti-slip net for tires of the present invention, it is possible to satisfy two properties that are difficult to reconcile: high flexibility and good installation properties, as well as resistance to damage and long life.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view showing the essential parts of an anti-slip net for tires according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line - - of Fig. 1, and Fig. 3 shows the structure of the core body. FIG. 4 is an enlarged plan view of the composite wire rod, and FIG. 4 is a front view showing a state in which a general anti-slip net for tires is attached to a tire. 10...Net main body, 11...Composite wire, 12
... Core body, 16 ... Center wire rod, 17 ... Resin thread,
18...Stainless steel wire.

Claims (1)

[Claims for Utility Model Registration] In an anti-slip net for a tire, which is formed into a mesh belt shape from a plastic material such as synthetic rubber and is attached to the outer circumferential surface of a tire, a core is provided inside the mesh portion. The body is buried along its entire length, and these core bodies are made by stranding a plurality of composite wires made by tightly winding metal wire around a resin center wire, and the surface of each core body is covered with the plastic material. An anti-slip net for tires that is characterized by its close contact.