JPH0424241B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for preventing automobile tires from slipping on snowy, frozen, muddy, etc. road surfaces.
The present invention relates to an anti-slip device for automobile tires and a method for manufacturing the same.

In other words, in order to prevent noise and damage to the road surface, rubber and plastic anti-slip devices for automobile tires are used instead of conventional metal chains, but these devices are excellent on snow and compacted snow. have an effect. However, it is dangerous to slip on frozen roads, so in order to improve the anti-slip performance, nail-like spikes or other anti-slip metal fittings are installed.

In particular, the present invention aims to improve this anti-slip fitting to improve its anti-slip performance and durability, and to provide a simple and inexpensive anti-slip fitting for automobile tires and a method for manufacturing the same.

Conventionally, the following types of spikes or anti-slip metal fittings have been used and proposed as anti-slip devices for automobile tires made of rubber or plastic.

Conventional method 1 (Utility Model Publication No. 59-14247): A roughly thumbtack-shaped spike is attached to each intersection of the mesh mold.
A string-like core material is stretched around the mold to form a mesh, and a coating material such as synthetic rubber is filled on top of this mesh, and simultaneously press-molded and vulcanized to form the intersection. To obtain an anti-slip tool for automobile tires in which spikes are fixed to a mesh core material and projected.

Conventional method 2: At or between intersections of elastic mesh bands,
A nail-shaped spike or the like is buried in a mold at the same time as molding to obtain a protruding anti-slip device for automobile tires.

Conventional method 3 (Utility Model No. 52-102607): At the intersection of the mesh,
A hole is drilled through the hole from the front to the back, and a nail-like spike is inserted into the hole from the back to the front to protrude, thereby obtaining a fixed anti-slip device for automobile tires.

Conventional method 4: The same nail-like spikes as used for spiked tires are used in the same manner, that is, holes with the desired diameter and depth are drilled from the surface at the intersections of the mesh rubber bands or in the rubber between the intersections, and a spike driving machine is inserted into these holes. This is an anti-slip device for automobile tires that uses embedded spikes to protrude.

Conventional method 5 (Japanese Patent Application Laid-open No. 51-64207): Anti-slip for automobile tires in which the diagonal in one direction of the intersection of mesh bands is wrapped in an oval shape and a non-slip fitting made of steel wire is caulked. It is a ingredient.

However, the conventional methods proposed and implemented have the following drawbacks.

In conventional method 1, spikes are placed at precise positions in a vulcanization mold with a length of about 2 m at high temperature.
It is difficult to weave and fix a 20 m long core material into a mesh, and this, together with the effort of filling the covering material rubber onto the mesh, is inefficient. Furthermore, in order to efficiently perform mesh knitting work, if unvulcanized rubber strings with reinforced core material are used, the spikes will not be fixed to the core material, and if the spike position is even slightly misaligned, the product will be defective, and the mold will be damaged. It has disadvantages such as breakage.

Conventional Method 2 If the spikes are not placed in accurate positions within the molding die, there are disadvantages that the die will be damaged, and that the elastic body will stretch while the car is running and the spikes will fall off.

Conventional Method 3 There is a drawback that the spikes are squeezed out by the pressure of the tires and the road surface and fall off from the back side while the car is running.

Conventional method 4 Spikes for tires are made to have a height of 10.5 mm to prevent them from falling off. However, this has the disadvantage that the thickness of the mesh band becomes excessively large, and that the spikes may fall off unless the area where the spikes are to be driven is excessively reinforced.

The nail-shaped hard spikes used in conventional methods 1 to 4 are:
Effective only on hard, smooth or icy roads. Furthermore, since it is hard and has a small cross-sectional area, it acts as a point load on the road surface, causing significant wear and tear on the road surface. Furthermore, in order to embed a nail-like object in the elastic body so that it does not fall off, the design height of the elastic body at least at the embedding location becomes excessive. This has the disadvantage that running stability deteriorates and the spikes do not grip the road surface vertically.

Conventional method 5. It has advantages such as easy installation, high anti-slip effect, little damage to the road surface, and does not fall off even when subjected to excessive stress, but if soft metal is used, it wears out quickly. If a hard metal is used, the strain caused by bending it into an elliptical shape will cause metal fatigue, and this will overlap with metal fatigue due to repeated stress during running, causing it to fall off quickly. Even if you select a metal with appropriate hardness, it will last 150km or more on a dry road surface.
The drawback is that it falls off after 250km.

The present invention improves the drawbacks of the conventional method, and provides an automobile tire that is inexpensive with less effort, does not fall off during running, has excellent wear resistance, is durable, and has an anti-slip metal fitting that has an excellent anti-slip effect. An object of the present invention is to provide a non-slip device and a method for manufacturing the same.

Noting that the conventional method has the above-mentioned drawbacks, the present inventors completed the present invention as a result of intensive research.

As an embodiment of the present invention can be seen in the drawings, the present invention provides a mesh rubber band having a circumferential length approximately of the tire to be mounted, and a through hole at the end of each mesh on both side edges of the mesh rubber band. or a respective tightening rope for attaching and fixing the mesh rubber band along the circumference of the tire through a through hole of a metal fitting attached to the end portion, and a respective tightening rope for attaching and fixing the mesh rubber band along the circumference of the tire. The oval ring itself, which is formed by bending a round steel, is placed on the surface of the mesh intersection of the band from about half to U.
A double U-shaped embedded anti-slip fitting has two upward semicircular protrusions bent into a shape and two downward semicircular protrusions at right angles to the two semicircular protrusions. The present invention is characterized in that rubber protrusions are formed by integrally vulcanizing a rubber cord and incorporating the two semicircular protrusions of the anti-slip fitting. That is, first, a round steel having a diameter of 2 to 4 mm as shown in Figs. 1a and 1b is bent to form an oval ring at the intersections forming the mesh of the mesh rubber band that is the base of the anti-slip device for automobile tires. This can be obtained by further bending it into a U-shape.

The main feature is that slips on frozen roads are prevented by using the anti-slip fitting 5, which has two upward semicircular protrusions a, a' and two downward semicircular protrusions b, b' perpendicular to these. This is what I did.

In addition, as shown in FIGS. 2 and 6, an unvulcanized reinforcing fiber core 4 is inserted between the upward semicircular protrusions a and a' and between the downward semicircular protrusions b and b' of the anti-slip fitting 5. An unvulcanized mesh rubber band having intersecting parts is prepared in advance by fitting the rubber string 3 and sandwiching the anti-slip fittings 5 from above and below, and then this is inserted into the mesh intersecting part of the vulcanization mold. The mesh rubber band is placed in a vulcanization mold having a concave portion on one side of which the heads of the semicircular projections a and a' of the anti-slip fitting 5 project, and is fitted and vulcanized.

As shown in FIGS. 3a, 3b, and 4, the anti-slip metal fittings 5 are embedded in the vulcanized rubber 2 to surround the intersecting reinforcing fiber cores 4 from above and below at the intersecting parts of the mesh to prevent slipping. Semicircular protrusion a of metal fitting 5,
To manufacture an anti-slip tool for automobile tires having a mesh rubber band as a base having a rubber protrusion 6 having a built-in head a'.

That is, the present invention also provides a mesh rubber band having approximately the circumference length of the tire to be mounted, and metal fittings attached to the through holes or ends of each mesh on both side edges of the mesh rubber band. and respective tightening ropes for attaching and fixing the mesh rubber band along the circumference of the tire through the through-holes of the tire. Two upward semicircular protrusions formed by bending approximately in half into a U shape,
A double U-shaped embedded non-slip metal fitting having two semicircular protrusions pointing downward at right angles was formed, and an unvulcanized rubber cord with a reinforcing fiber core extruded using an extruder with a crosshead was prepared. Using the mold,
A belt-like mesh having intersecting parts sandwiched in a substantially criss-cross pattern between the two upper and lower half-circular protrusions of the anti-slip fitting is prepared, and then a pair of upper and lower vulcanization molds is used to form the above-mentioned mesh. It is characterized in that the entire band-like network is heat-vulcanized and molded together with the rubber protrusions embedded therein in the semicircular protrusions at the mesh intersections.

Since the anti-slip fitting 5 used in the present invention is made of round steel, the molding yield is good, and the manufacturing method is simple and the mass production method has been established, so it is inexpensive.

Since there are many types of round steel, it is possible to freely select a material that is suitable for quenching to make it highly hard and wear resistant after being formed into a metal fitting. In addition, even if it is made hard, it is a semicircular protrusion, so it is less likely to damage the road surface.

Furthermore, since the two reinforcing fiber cores 4 intersecting with the anti-slip metal fittings 5 have a structure in which they surround each other, they will not fall off due to strong stress when the car is running. Therefore, the designed thickness of the mesh rubber band can be reduced, so that the running stability of the vehicle is not impaired.

In addition, in the process of pre-preparing the mesh rubber band, the unvulcanized rubber string 3 is fitted at a predetermined position between the semicircular protrusions a and a' and between the semicircular protrusions b and b' of the anti-slip fitting 5, which saves time and effort. A mesh rubber band with anti-slip metal fittings 5 can be manufactured at low cost. As described above, the present invention has many advantages.

The rubber used in the present invention may be either natural rubber or synthetic rubber. Rubber chemicals such as vulcanizing agents are mixed and used. In particular, a rubber compound containing a reinforcing agent such as carbon black and having excellent strength, abrasion resistance, weather resistance, and cold resistance is used.

The reinforcing fiber core material may be either natural or synthetic fiber, but polyamide, polyester, and aramid fibers, which have excellent heat resistance and strength, are preferred.They are treated with resorcin, formalin, or latex to improve adhesion to rubber. The ones that have been tested are particularly good.

An efficient method for producing an unvulcanized rubber string with a reinforcing fiber core is to use an extruder to extrude the compounded rubber into a string of a desired shape, and simultaneously extrude the reinforcing fiber core into the center of the string.

The rope for tightening and fixing that is passed through the string holes on both edges of the rubber band is a braid of natural or synthetic fibers, a metal wire coated with a synthetic resin, or a rubber cord.

The round steel used in the present invention has a diameter of 2 to 4 mm, and is made of a material that can be hardened to obtain desired hardness and wear resistance. In order to prevent rust and improve adhesion to rubber, brass or zinc plating may be applied, and
Good results can be obtained by applying and drying a metal-rubber adhesive such as the product name Chemilock.

The present invention will be explained below with reference to Examples and drawings.

Example 1st step As shown in Figures 1a and 1b, the diameter is 3 mm.
It is obtained by bending a spring steel wire to form an oval ring, which is then further bent into a U-shape. A non-slip fitting 5 is formed having two upward semicircular protrusions a, a' and two downward semicircular protrusions b, b' at right angles thereto. This is quenched to a Bitsukas hardness of approximately 650. Next, after degreasing the surface, an undercoat of Chemiroc 205 (trade name) using a rubber-to-metal adhesive is dried, and then a top coat of Chemiloc 220 is dried.

2nd step: A compounded rubber with high strength, wear resistance, and cold resistance is kneaded and rolled into a ribbon to be fed to an extruder.

3rd step: The ribbon-shaped compounded rubber is fed to the screw of an extruder equipped with a crosshead, and at the same time as extrusion, a nylon core treated with resorcinol, formalin, or latex is fed from the crosshead, and unvulcanized reinforcing fiber cores with 4 reinforcing fiber cores of a predetermined shape and size are supplied. Form the rubber string 3.

Fourth step: A preparation mold 10 shown in a partially perspective view in FIG. 6, which has approximately the length of the outer circumference of the tire, is used. The mesh-like groove of the preparation mold 10 has sufficient dimensions in both depth and width so as to loosely accommodate the unvulcanized rubber cord 3. A medium vulcanization mold 10 consisting of a core metal support part 9 to which a core metal 8 is fixed and an outer frame 7 is placed around the outer periphery of the preparation mold 11, and a mesh-like concave groove is formed at one end of the preparation mold 11. The above-mentioned unvulcanized rubber string 3 is placed inside and fitted, and the ends of both edges are hooked onto the core metal 8 of the medium vulcanization mold 10, turned over, and placed into the continuation of the concave groove. Repeat sequentially,
By making two reciprocations on the surface of the preparation mold 11, an unvulcanized mesh rubber band of a predetermined shape is knitted.

During this work, after the unvulcanized rubber cord 3 passes through the designated intersection for installing the anti-slip fitting 5 for the first time, the downward semicircular protrusions b and b' of the anti-slip fitting 5 are inserted at this specified intersection. Attach by holding the unvulcanized rubber string 5 between them so that they fit together. Also, when passing the unvulcanized rubber cord 3 for the second time by crossing this intersection, insert the unvulcanized rubber cord 3 between the two upward protrusions a and a' of the anti-slip fitting 5 already attached. Push it into place from above and pass it through.

In this way, each intersection of the mesh rubber band with the non-slip metal fittings 5 knitted into the concave groove of the preparation mold 10 is tightly attached using a crimping machine with claws for crimping the preparation mold 1.
1, the unvulcanized mesh rubber band with the non-slip fittings 5 attached to the intermediate vulcanization mold 10 at predetermined intersections is knitted. This unvulcanized mesh rubber band is prepared in advance. In this process, the middle vulcanization mold 10 can be used in the next vulcanization molding process for the upper and lower pairs of upper and lower molds, and by having a plurality or more of them in the preforming process, the work can be carried out efficiently. .

Fifth step: a belt-shaped mesh, a concave groove for forming a rope passage hole 13' on both edges of the mesh, and a recess for accommodating the semicircular protrusion of the anti-slip fitting 5 at this predetermined intersection;
A lower vulcanization mold having a concave groove for accommodating the core metal 8 of the medium vulcanization mold 10 and the core support part 9, and a pair thereof form rope passage holes 13' on both edges of the mesh. A top vulcanization mold is used which has a groove for accommodating the core metal and the core support part of the medium vulcanization mold 10.

The lower vulcanization mold is surrounded by the outer frame 7 of the middle vulcanization mold 10 with the unvulcanized rubber mesh rubber band preformed in the previous step, and the unvulcanized mesh rubber band, the core bar 8 and the core metal support are placed. 9 and are respectively arranged and fitted into the grooves of the lower vulcanization mold.

Next, an upper vulcanization mold is placed on top of this, fitted, and vulcanized by applying pressure and heating.

6th step After vulcanization molding in the previous step, open the upper and lower vulcanization molds and remove the vulcanized mesh rubber band 1 from the middle vulcanization mold 10 with the vulcanized mesh rubber band 1 attached, as shown in Fig. 4. A rope passage hole 13 and a connecting fitting passage hole 15 are provided at both edges of the mesh of the mesh rubber band 1 shown in a partially perspective view.
As shown in Figures 3a and 3b and Figure 4, a non-slip metal fitting 5 is attached to the intersection of the new mesh.
To obtain a non-slip device for an automobile tire, which includes a mesh rubber band 1 according to the present invention, in which a non-slip metal fitting 5 is integrally embedded in a mesh intersection having a rubber protrusion 6 incorporating two semicircular projections.

As a result, it is possible to efficiently and inexpensively manufacture an anti-slip device for automobile tires in which an anti-slip metal fitting with excellent functions not found in conventional products is embedded integrally in the rubber at mesh intersections. Further, in the above embodiment, since the mesh rubber band has rope through holes 13 and connecting fitting through holes 15 on both edges of the mesh rubber band, the middle vulcanization mold 10
However, without using a middle vulcanization mold, the preparation and vulcanization molding are performed almost in accordance with the above process using a preparation mold and upper and lower vulcanization molds, and then later. Of course, by attaching rope threading fittings and the like to both edges of the mesh rubber band, it is possible to efficiently and inexpensively manufacture an anti-slip device for automobile tires in which the anti-slip fittings are embedded integrally in the rubber at the mesh intersections.

As shown in FIG. 5, the anti-slip device for automobile tires made of a mesh rubber band according to the present invention is manufactured using a conventional method that includes a tightening rope 14, a connecting fitting 16, a connecting hook fitting 17, and a rope hanging hook. It can be easily attached to the tire 20 using the metal fittings 18 and the rubber rope 19.

The present invention has the following effects.

(1) Since the anti-slip fittings are made by bending round steel,
The yield of steel is high, and the mass production method for making metal chains has been established, so it can be obtained at low cost.

(2) Since there are many types of round steel materials, it is possible to increase the hardness and improve wear resistance by quenching after forming into metal fittings.

(3) The anti-slip metal fittings and the crossed reinforcing fiber cores have a structure in which they surround each other, are embedded in strong rubber, and are strongly bonded to the rubber, so they can withstand severe stress even when the car is running. , never fall off.

(4) The anti-slip fittings are strongly bonded to the rubber and embedded in the rubber, so there is little wear. Furthermore, even if the semicircular protrusions are worn out, they act as four nail-like spike metal fittings, exhibiting an anti-slip effect, and will not fall off.

(5) Since the anti-slip metal fittings are semicircular protrusions, they are less likely to damage the road surface like nail-like spikes.

(6) From effects (3) and (4), the design height of the mesh rubber band can be lowered, so cars equipped with this have good running stability.

(7) In the process of preforming the mesh rubber band, it is attached by fitting the semicircular protrusions a, a' and b, b' of the non-slip fitting to the unvulcanized rubber string at the specified intersections. , requires less installation work and can be manufactured at low cost. In this way, it has many excellent effects not found in conventional products.

[Brief explanation of drawings]

FIG. 1a is a perspective view showing a non-slip fitting used in an embodiment of the present invention, FIGS. 1b and 1c are sectional views of FIG. 1a, and FIG. FIG. 3A is a perspective view showing a main part of an unvulcanized mesh rubber band, FIG. 3B is a perspective view showing a main part of a mesh rubber band according to an embodiment of the present invention, and FIG.
4 is a perspective view showing a part of a mesh rubber band obtained according to an embodiment of the present invention, and FIG. 5 is a perspective view of a product according to an embodiment of the present invention mounted on an automobile tire. , FIG. 6 is a partial perspective view showing the structure of a pre-formed unvulcanized mesh rubber band in one embodiment of the present invention. 1... Vulcanized mesh rubber band, 2... Vulcanized rubber, 3... Unvulcanized rubber string, 4... Reinforced fiber core,
5... Anti-slip fittings, a, a', b, b' semicircular protrusions thereof, 6... Rubber protrusions incorporating semicircular protrusions of anti-slip fittings, 7... Outer frame, 8... Core metal, 9 ... Core metal support part, 10 ... Medium vulcanization mold, 11 ... Preparation mold,
12... U-shaped entwining part, 13... Rope passing hole, 13'... Rope passing hole part, 14... Tightening rope, 15... Connecting fitting passing hole, 16... Connection insertion fitting, 17... ...Connection hook fitting, 18...
Rope hook fitting, 19... Rubber rope, 20...
tire.

Claims (1)

[Scope of Claims] 1. A mesh rubber band having approximately the circumference of the tire to be mounted, and metal fittings attached to the through holes or ends of each mesh on both side edges of the mesh rubber band. and respective tightening ropes for attaching and fixing the mesh rubber band along the circumference of the tire through the through-holes of the tire, wherein the mesh rubber band has a mesh intersecting surface on the surface of the mesh rubber band, The oval ring itself, which is formed by bending round steel, is approximately half U.
A double U-shaped embedded anti-slip fitting has two upward semicircular protrusions bent into a shape and two downward semicircular protrusions at right angles to the two semicircular protrusions. A non-slip device for an automobile tire, characterized in that a rubber protrusion is formed by integrally vulcanizing a rubber cord and incorporating two semicircular protrusions of the non-slip metal fitting. 2. The anti-slip tool for automobile tires according to claim 1, wherein the diameter of the round steel is 2 to 4 mm. 3. Through a mesh rubber band having approximately the length of the circumference of the tire to be mounted, and through holes in the ends of each mesh on both sides of the mesh rubber band, or through holes in metal fittings attached to the ends, In the manufacturing method of an anti-slip device for automobile tires, which consists of a mesh rubber band attached and fixed along the circumference of the tire, and respective tightening ropes, the oval ring itself made of round steel is roughly halved into a U-shape. Two upward semicircular protrusions formed by bending the
A double U-shaped embedded non-slip metal fitting having two semicircular protrusions pointing downward at right angles was formed, and an unvulcanized rubber cord with a reinforcing fiber core extruded using an extruder with a crosshead was prepared. Using the mold,
A belt-like mesh having intersecting parts sandwiched in a substantially criss-cross pattern between the two upper and lower half-circular protrusions of the anti-slip fitting is prepared, and then a pair of upper and lower vulcanization molds is used to form the above-mentioned mesh. A method for manufacturing an anti-slip device for an automobile tire, characterized in that the entire band-like mesh is heat-vulcanized and molded together with the rubber projections in which the semicircular projections at the mesh intersections are embedded. 4. The method for manufacturing an anti-slip device for automobile tires according to claim 3, wherein the diameter of the round steel is 2 to 4 mm.