JPH1058928A - Antislipping device for tire, and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve both of manufacturing efficiency and strength, by forming an antislipping device body of a network pattern, by the rubber in which the short fiber is mixed, and partially burying the core materials of high tensile force, in the predetermined areas of the antiskid device body, so that the device body is provided with the durability to the concentrated load added to a fittings installation part or the like. SOLUTION: A device body a formed into a network pattern, is integrally molded substantially in the shape of band, by using the rubber material b in which the short fiber c is mixed, and the latch parts al, a2 are formed along the both side edge parts at constant intervals. A tightening rope 1 is installed along the latch parts a1, and is caulked and fixed to the latch parts a1 by the stopper fittings 2. The stopper fittings 3 for stopping a rubber band and an attachment for tightening, are caulked and fixed to the latch parts a2. The core material d1 formed by the synthetic resin fiber of high tensile force, is partially buried in the core part of the latch parts a1, a2, to keep the tensile strength of the latch part a1, a2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-slip device for a tire.

[0002]

2. Description of the Related Art Some conventional anti-skid devices for tires include:
As in the tire antiskid device 100 shown in FIG.
There is a non-slip device main body 100 'which is formed in a mesh pattern using a rubber material. Anti-slip device 1 described above
Reference numeral 00 denotes an apparatus main body 100 'formed by assembling a rubber wire rod containing a core into a mesh pattern and integrally forming the same.

[0003] The apparatus body 100 'has hooks 101, 102 formed at predetermined intervals along the tire inner edge and the tire outer edge, and each of the hooks 101 inside the tire.
A fastening rope 103 is provided along the
Each of the hooks 101 is fixed to the protruding end of the corresponding hook 101 via the same. In addition, a latch 105 for latching a rubber band (not shown) for fastening is provided on each latch 102 on the outside of the tire.
Has been fixed.

[0004]

The anti-slip device 100 for a tire constructed as described above is formed by integrally forming a wire having a high-tension core material (not shown) provided therein in a net shape. A core material is provided inside all parts of the apparatus main body 100 ', so that each part of the apparatus main body 100' has sufficient tensile strength. In addition, in order to actually manufacture the above-described device main body 100 ′, a wire formed by coating a non-vulcanized rubber around a high-tension core material is tentatively assembled accurately in the same mesh pattern as the device main body 100 ′. Then, the temporarily assembled wire is fitted into a molding die and press-molded.

However, since the work of temporarily assembling the wire having the core therein as described above in the same mesh pattern as the apparatus main body 100 'takes a great deal of time, the applicant of the present application has proposed the work of temporarily assembling the wire. A non-slip device for a tire, which can be formed using a rubber material containing short fibers, which can be configured without performing the above, was manufactured.

[0006] The anti-skid device for a tire is prepared by mixing high-strength fibers cut to a length of several millimeters into unvulcanized rubber, rolling the unvulcanized rubber into a belt having a predetermined thickness, and then rolling the device. The rubber material is stamped and formed to have substantially the same outer shape as the main body, and this rubber material is fitted into a molding die and vulcanized. This anti-skid device for a tire can eliminate the step of temporarily assembling wires, which is required in the anti-skid device for a tire described above, so that the production efficiency can be greatly improved.

However, the device body made of rubber material containing short fibers as described above has sufficient strength at the ground contact portion, but cannot withstand a concentrated load, and is not capable of withstanding a fastening rope for a fastening rope or a rubber band. There has been a problem that the latching part to which the latch is fastened is cut.

[0008] An object of the present invention is to provide a tire anti-slip device made of a rubber material containing short fibers as described above with a function capable of withstanding a concentrated load applied to a fitting mounting portion or the like, thereby improving production efficiency. It is an object of the present invention to provide a non-slip device for a tire, which can satisfy both the strength and the strength, and a method for manufacturing the same.

[0009]

In order to solve the above-mentioned problems, a non-slip device for a tire according to the present invention comprises a non-slip device main body having a mesh pattern using rubber mixed with short fibers. A high-tension core material is partially provided at a predetermined position in the anti-slip device body.

[0010] In the above-mentioned anti-slip device for a tire, it is preferable to use aramid fiber as the short fiber.

In the method for manufacturing a non-slip device for a tire according to the present invention, unvulcanized rubber mixed with short fibers is rolled to form a band-shaped rubber material having a predetermined thickness, and a mesh-shaped pattern is formed from the band-shaped rubber material. A main body material having substantially the same shape as the anti-slip device body is punched and formed, and the punched main body material is fitted into a die for molding the anti-slip device main body, and a high-tension core material is provided at a predetermined position in the molding die. A non-vulcanized rubber covered with a wire rod, and attached as a part of the main body material, and vulcanizing and molding the unvulcanized rubber in the mold while pressing the molding die. It is.

According to the above-described means, the following operations are provided. The anti-skid device for a tire according to the present invention has a network-shaped anti-slip device body made of rubber mixed with short fibers. The short fibers described above are densely mixed into the rubber and function as a stress material, thereby improving the mechanical strength of the rubber material. Also, a high-tension core material is partially provided inside a predetermined portion of the anti-slip device body, for example, at a portion where a metal fitting is fixed. The core material exhibiting a sufficient tensile strength receives a load applied intensively through the above-mentioned latch, and prevents the rubber in the same portion from breaking.

In the production method of the present invention, the unvulcanized rubber mixed with short fibers is rolled to a predetermined thickness to form a belt-shaped rubber material. The belt-shaped rubber material is punched into a substantially same shape as the anti-slip device main body to form a main body material, and is fitted into a mold for molding the main body of the device. In addition, a wire is fitted into a predetermined location in the mold, for example, a location corresponding to a mounting portion of a latch, and is attached as a part of the main body material. The wire is formed by coating a high-strength core material with unvulcanized rubber, and adheres to the body material by utilizing the viscosity of the unvulcanized rubber. The main body material placed in the molding die is vulcanized while being heated and pressurized, and is molded as an apparatus main body in the same die. In the vulcanization process, the unvulcanized rubbers of the main body material and the wire are melted and completely integrated.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The anti-skid device for a tire shown in FIG. 1 is a rubber anti-slip device that is wound around the tire and mounted thereon, and has a mesh-shaped device body a made of rubber.
Is provided.

The apparatus main body a constructed in a mesh pattern
Are formed in a substantially belt-like shape using a rubber material b, and along the side edges corresponding to the inside and outside of the tire, hook portions a1 and a2 projecting in a substantially mountain shape are arranged at regular intervals, respectively. It is formed.

A non-stretchable tightening rope 1 is provided along each hooking portion a1 inside the apparatus main body a, and a fastening fitting 2 is provided.
And is caulked and fixed to each hook a1. The above-mentioned tightening rope 1 is provided with connecting tools 1a, 1b attached to both ends.
Is connected, thereby tightening the inside of the apparatus main body a. Further, a rubber band for fastening and a latch 3 for latching an attachment (not shown) are caulked and fixed to each of the latches a2 on the outer side of the apparatus main body a.

The apparatus main body a is integrally formed using a rubber material b into which short fibers c of aramid fibers are mixed. The short fiber c is formed by cutting the aramid fiber into a length of about 3 mm, and is mixed with the rubber material b at about 3% (weight ratio). The short fiber is most preferably an aramid fiber having a high tensile strength and a high toughness, but a polyester fiber or a nylon fiber may be used.

Along the center of each of the hooks a1 and a2 of the apparatus body a, a core d1 made of synthetic resin fiber having high tensile strength is provided.
(Fig. 1). The core member d1 is partially provided in the range of the hooks a1 and a2 protruding from both side edges of the apparatus main body a, and secures the tensile strength of the hooks a1 and a2.

In the apparatus main body a constructed as described above, the innumerable short fibers c mixed in the rubber material b function as a stress material, and the tensile strength and rigidity required for each part except each of the hooks a1 and a2. To secure. In addition, a load is intensively applied to each of the hooks a1 and a2 of the apparatus main body a via the fastening fitting 2 and the fastening fitting 3, but the strong core material d1 provided in the same portion causes this load. Can be handled.

Next, a description will be given of a method of manufacturing the anti-slip device for a tire configured as described above. A predetermined amount, for example, about 3% by weight of aramid staple fiber c is mixed into the unvulcanized rubber b ', which is a material of the apparatus body a, and is kneaded well and evenly distributed in the unvulcanized rubber b'. Let it. The amount of the aramid short fibers c mixed into the unvulcanized rubber b 'is suitably about 3% by weight, but the mixing amount is arbitrary. The length of the aramid short fiber c is 3 mm or more, or 3
It may be millimeters or less. Further, short fibers having different lengths may be mixed and used. Further, as the type of the short fiber, a polyester fiber, a nylon fiber or the like may be used in addition to the aramid fiber.

The unvulcanized rubber b 'mixed with the aramid short fibers c is rolled by a roll to form a belt-shaped rubber material e having a predetermined thickness. The thickness of the belt-like rubber material e is set to be somewhat thicker than the actual thickness of the apparatus main body a.

From the belt-like rubber material e, a main body material a 'having substantially the same outer shape as the apparatus main body a is punched out using a punching die (not shown) (FIG. 2). The main body material a ′ is punched into the same outer shape as the apparatus main body a, but the portions corresponding to the respective hooks a1 and a2 on both sides of the main body are formed using a wire d described later. Hanging part a
Punched and formed to the outer shape from which 1, a2 has been removed (FIG. 3).

As described above, the body material a 'is formed to be somewhat thicker than the actual apparatus body a. Further, the width dimension of each linear portion constituting the mesh pattern of the main body material a 'is formed to be somewhat smaller than the width of the actual linear portion of the apparatus main body a. As a result, the cross-sectional shape of the linear portion of the main body material a ′ is narrower than the cross-sectional shape of the device main body a, and
It becomes thick. The volume of the main body material a 'is configured to be slightly larger than the volume of the apparatus main body a.

The main body material a 'formed by punching as described above is placed in a mold h for molding the apparatus main body a. The molding die h has a precise cavity h1 for molding the apparatus main body a, and the above-mentioned main body material a 'is fitted into the cavity h1 and accurately positioned (FIGS. 4 and 5). Incidentally, in the above state, the upper surface of the main body material a 'slightly protrudes from the upper edge of the cavity h1 (FIG. 4).

The molding die h into which the main body material a 'has been fitted as described above is attached to each of the hooks a in the cavity h1.
The rubber material is not yet fitted in the portions corresponding to 1 and a2. A wire d serving as a rubber material is fitted into a portion of the cavity h1 where the hooks a1 and a2 are formed, and is incorporated as a part of the body material a '.

As shown in FIG. 6, the wire d is formed by coating an unvulcanized rubber d2 around a core d1 formed by twisting a high-tensile synthetic resin fiber into a string. It is molded into. The wire rod d is previously attached to the hooks a1, a2.
Cut to the length required to form The cut wire d is connected to each of the hooks a in the cavity h1.
1 and a2, and both end portions are pressed against the side edges of the main body material a 'housed in the cavity h1, and adhered using the viscosity of the unvulcanized rubbers (FIGS. 4 and 5). ).

As described above, the molding die h into which the wire material d of the main body material a 'and the hooks a1 and a2 are fitted is shown in FIG.
As shown by, the pressing die i is heated while being pressed against the die surface, and the main body material a ′ in the molding die h is vulcanized at a predetermined temperature and pressure for a predetermined time. In the process of vulcanization molding, the main body material a ′ heated in the molding die h
Is in a molten state, closely adheres to the cavity h1, and is precisely molded as the apparatus main body a. At the same time, the unvulcanized rubber d2 of the wire rod d constituting each of the hooks a1 and a2 is melted and completely integrated with the unvulcanized rubber b 'of the body material a'. The core d1 of the wire d is partially provided along the center of the cross-section of each of the hooks a1 and a2 of the molded apparatus main body a.

When the vulcanization molding is completed, the molding die h
After taking out the molded apparatus main body a from the inside and removing burrs protruding to the periphery, the fastening fitting 2 and the fastening metal fitting 3 of the tightening rope 1 are caulked and fixed to each of the hooking parts a1 and a2.

In the above embodiment, a normal unvulcanized rubber containing nothing is used as the unvulcanized rubber d2 used for the wire d. However, the unvulcanized rubber used for the wire d is
As in the case of the uncured rubber of the main body material a ′, a mixture of aramid single fibers c may be used, whereby the boundary between the wire d and the main body material a ′ after vulcanization molding can be more natural. It can be integrally molded in the state.

In the anti-slip device for a tire according to the above embodiment, the core material d1 is partially provided in each of the hooking portions a1 and a2. May be any part of the apparatus main body as long as it is a part to which reinforcement is added and a part requiring reinforcement. Also, the form of the core material provided inside a required portion of the apparatus main body may be provided not only along the shape of the main body as in the above-described engaging portions a1 and a2, but also inside other portions. Good. For example,
In the case where the device main body a2 is divided into three parts in the tire outer peripheral direction as in the tire anti-slipping device shown in FIG. 9, a metal fitting 4 for connecting the joined portions of the device main body a2 is inserted. A core member d1 may be provided in a substantially annular shape around the hole 5 to reinforce the hole 5.

In the above-described embodiment, the hooks a1 and a2 of the apparatus main body a are configured such that the wire d is attached to the side of the main body material a 'so that the core material d1 is provided inside. did. However, each hook of the apparatus body may be manufactured as shown in FIG. The main body material a ″ shown in FIG.
It is molded integrally including a2 '. Then, the main body material a ″ having the hook portions a1 ′ and a2 ′ is formed into a molding die h.
After fitting into the cavity h1, the cavity h1
A core material d1 ′ covered with a rubber primer is placed along the main body material a ″ hooking portions a1 ′ and a2 ′ accommodated therein. Thereafter, when vulcanization molding is performed in the same manner as described above, the core material d1 'is in a molten state, and the respective hooking portions a1', a
It is embedded inside the 2 ′ rubber material and is provided internally as a core material d1. In this case, the aramid fiber c is also contained in the rubber material of each of the hooks a1 and a2.

[0032]

As described above, according to the present invention, a non-slip device main body having a mesh-like pattern is formed by using rubber mixed with short fibers, and a high-tension core material is formed at a predetermined position in the device main body. Since it is constructed internally, while maintaining the strength of the portion to which the load applied during traveling is relatively dispersed, such as the ground contact surface of the anti-slip device main body, is maintained by the short fibers mixed into the rubber, It is possible to sufficiently secure the strength of the metal fitting mounting portion of the apparatus main body which is easily broken when a strong concentrated load is applied by the high-tension core material provided in the rubber. Therefore, as compared with the conventional one in which the core material is provided inside the entire non-slip device body, the time and labor for temporarily assembling the wire can be greatly reduced, and the material cost can be reduced.
Furthermore, even if a concentrated load is applied to the metal fitting mounting portion or the like of the slip prevention device main body, the load can be received by the partially provided core material, and the main body can be prevented from breaking.

In the case where aramid fiber is used as the short fiber mixed in the rubber, the short fiber functioning as a stress material in the rubber has high tensile strength and high toughness, and is compared with other fibers. The effect of preventing the breakage of the device body and the function of delaying the growth of cracks can be effectively improved.

In the manufacturing method of the present invention, a main body material having a network pattern is punched out of a belt-like rubber material mixed with short fibers, and the main body material is fitted into a mold for molding the anti-slip device body. Since a wire containing a core material is fitted into a predetermined position in a mold and adhered as a part of the main body material, and the above-described molding die is used to press-mold the anti-slip device body, the tire is used for a tire. The required strength of the anti-slip device can be ensured, and the labor of temporarily assembling the wire rod, which has been very time-consuming, can be replaced with the work of punching out the main body material from the belt-shaped rubber material. Can be greatly reduced, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway view of a tire antiskid device embodying the present invention.

FIG. 2 is a perspective view showing a state where a main body material is stamped and formed from a belt-shaped rubber material.

FIG. 3 is a front view showing a punched main body material.

FIG. 4 is a perspective view showing a state in which a main body material and a wire are fitted into a molding die.

FIG. 5 is a plan view showing the molding die.

FIG. 6 is a perspective view showing a wire rod.

FIG. 7 is a partially cutaway side view showing a state in which vulcanization molding is performed while pressing a molding die.

FIG. 8 is a perspective view showing a state in which a core material is placed on a hook formed integrally with the main body material.

FIG. 9 is a front view showing a tire anti-slip device configured by dividing the device main body.

FIG. 10 is a front view of a conventional anti-skid device for a tire, with a portion cut away.

[Explanation of symbols]

 a: Device body a ': Body material b': Unvulcanized rubber c: Aramid short fiber d: Wire rod d1: Core material d2: Unvulcanized rubber h: ..Molds for molding

Claims (3)

[Claims] 1. A non-slip device main body having a mesh-like pattern is formed by using rubber mixed with short fibers, and a high-tension core material is partially provided at a predetermined position in the non-slip device main body. Anti-slip device for tires. 2. A non-slip device for a tire according to claim 1, wherein aramid fiber is used as the short fiber. 3. An unvulcanized rubber mixed with short fibers is rolled to form a band-shaped rubber material having a predetermined thickness, and a main body material having substantially the same shape as a main body of a non-slip device having a mesh pattern is punched out from the band-shaped rubber material. At the same time, the punched body material is fitted into a mold for molding the anti-slip device body, and a wire made of a high-tension core material coated with unvulcanized rubber is fitted into a predetermined location in the molding mold. A non-vulcanized rubber in the mold while pressing the molding die and vulcanizing and molding the tire.