JPS6251432A - Manufacture of anti-skidding device for type - Google Patents

Abstract

PURPOSE:To prevent large sagging from developing in a flexible reinforcing member at molding by a method wherein an elastic body is molded after the flexible reinforcing member is stretched by being spanned across stretching means. CONSTITUTION:Metal bars 26 are seated to the grooves 28 of a bottom force 20. Consequently, the intermediate portions of each metal bar 26 pierce lugging material grooves 24. Accordingly, when the intermediate portions of a tire cord 16 are successively turned up by being wound round the metal bars 26 in the lugging material grooves 24 so as to arrange the tire cord 16 along the lugging material grooves 24, the tire cord 16 is installed in zigzags along the lugging material grooves 24. Under the state as just mentioned above, a top force 22 is put on the bottom force 20 and rubber is filled from an inlet in the lugging material grooves 24. The fixing of some portions of the tire cord to the metal bars 26 and the attaching of the ends of tire cord 16 to the bottom force 20 or top force 22 may be effective against the accidental separation of the tire cord 16 from the metal bars 26 or the decrease of the tire cord 16 during the filling of the rubber. The charged rubber fills itself integrally to the outer periphery of the tire cord 16 spanned across the metal bars.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a tire anti-slip device for manufacturing an anti-slip device used as a tire anti-slip device.

[Background technology and matters to be solved]

A metal chain attached to the outer periphery of a tire is commonly used as a vehicle tire anti-slip device used during snowfall. However, metal chains are complicated to install, make a lot of noise when the vehicle is running, and have the disadvantage that the chain hits the vehicle body and damages the vehicle body while the vehicle is running.

To eliminate this drawback, a rubber anti-slip device called a so-called ladder type is used (Utility Model Publication No. 54-8483, Utility Model Publication No. 56-20245, Utility Model Publication No. 57-30173, Japanese Utility Model Publication No. 57-30173, Japanese Utility Model Publication No. 57-30173, No. 57-53202). These Go1. In the anti-slip device made by the manufacturer, a plurality of anti-slip members are arranged on the outer periphery of the tire in parallel with the tire axis, and the ends of these members are connected with ropes and attached to the outer periphery of the tire.

These anti-slip members often have a tire cord, which is a flexible reinforcing member, embedded therein for reinforcement.

Since this tire cord has high tensile strength, it improves the durability of rubber tire anti-slip devices.

However, the tire cord deforms and meanderes as the rubber flows during vulcanization, and may be buried in the rubber while meandering. Therefore, when the tire cord is subjected to a large tension in the longitudinal direction, the deformed tire cord becomes straight, and the rubber is locally subjected to large strain by the tire cord, causing early breakage.

The present invention takes the above facts into consideration, and also when a flexible reinforcing member such as a tire cord is integrally formed with an elastic body such as rubber,
It is an object of the present invention to obtain a method for manufacturing a tire slip prevention device in which a flexible reinforcing member does not undergo large deflection within an elastic body.

[Summary and operation of the invention]

The method for manufacturing a tire anti-slip device according to the present invention is characterized in that the elastic body is molded after the flexible reinforcing member is stretched over the tensioning means and tensioned.

The tensioning means are, for example, bars that are stretched parallel to each other into the mold, and the flexible reinforcing element can be tensioned by being stretched over these metal bars using a tire cord. For this reason, if the rubber is integrally molded including the tire cord, and the rod is pulled out of the rubber after molding,
The tire anti-slip device is completed.

In this way, the tire cord is stretched around the metal rod and tensioned, so there is no major bending in the molded state.
Even if the rubber is subjected to tension during use, this alone will not cause the rubber to break.

The tensioning means may be a hook or the like used as a means for attaching the tire anti-slip device to the tire.

This hook is placed in advance in a mold, and a tire cord is stretched over a part of this hook to make it taut, and an elastic body including the tire cord and hook is integrally molded. In this case, there is no need to remove the hook from the rubber after molding, and it can be used as is as part of the tire anti-slip device.

[Embodiments of the invention]

FIG. 2 shows a tire anti-slip device IO manufactured using this embodiment. This tire skid prevention device 10 is made of a plurality of lug materials 12 in a V-shape,
Both ends of these lug members 12 are integrally connected to adjacent V-shaped lug members 12.

Attachment holes 14 are formed at both ends and the center of the lug material 12, and are used for attaching hooks for attaching the tire anti-slip device 10 to a tire.

A tire cord 16 folded back in a zigzag shape is buried in the lug material 12. This tire cord 16 constitutes a flexible reinforcing member and can support the tension applied to the tire anti-slip device IO.

The lug material 12 has a length larger than the width dimension W of the tire 18, and when attached to the outer periphery of the tire 18, the lug material 12 is bent so that the vicinity of both ends is in close contact with the side surface of the tire 18. ing.

FIG. 1 shows a lower mold 20 for manufacturing the tire anti-slip device 10 shown in FIG. 2. As shown in FIG.

Further, FIG. 3.4 shows a sectional view of the state shown in FIG. 1 with the upper die 22 attached. V-shaped lug material grooves 24 corresponding to the lug material 12 are continuously formed in the lower mold 20 and the upper mold 22 in a zigzag shape.

A pair of metal rods 26 serving as tension means are parallel to each other and accommodated in grooves 28 provided in the lower mold 20 and the upper mold 22. The grooves 28 are formed semicircularly in the portions of the lower mold 20 and the upper mold 22 where the lug material grooves 24 are not formed, and are shown in FIG. 4 when the lower mold 20 and the upper mold 22 are aligned. It has a circular shape that tightly accommodates the metal rod 26.

Further, the intermediate portion of the metal rod 26 passes through the lug material groove 24, and the intermediate portion of the tire cord 16 is wrapped around this penetrating portion and folded back. Therefore, even if the metal rod 26 is wrapped while applying tension to the lug groove 24, the metal rod 26 is held to the lower mold 20 or the upper mold 22 by the groove 28, so that the tension of the tire cord 16 can be reliably maintained. can be supported.

Next, a procedure for manufacturing the tire slip prevention device 10 of this embodiment will be explained.

The metal rod 26 is placed in the groove 28 of the lower die 20. As a result, the intermediate portion of the metal rod 26 passes through the lug material groove 24. For this purpose, if the middle part of the tire cord 16 is sequentially wound around the metal rod 26 in the lug groove 24 and then folded back, and the tire cord 16 is placed along the lug groove 24, the tire will be finished as shown in FIG. The cords I6 are arranged in a staggered manner along the lug groove 24.

Here, the upper mold 22 is superimposed on the lower mold 20, and the lug material groove 2
Rubber is filled inside from an injection port (not shown). During this filling process, the tire cord 16 is
A part of the tire cord 16 may be fixed to the metal rod 26, or the end of the tire cord 16 may be attached to the lower mold 20 or the upper mold 22.

The filled rubber is integrally filled into the outer periphery of the tire cord 16 that is stretched around it. After the vulcanization process, the metal rod 26 is pulled out from the groove 28 and the tire slip prevention device 10 is taken out from the lower mold 20 and upper mold 22 to complete the manufacturing process.

In this way, since the tire cord 16 is filled with rubber while being under tension, the tire cord 16 is buried in the tire anti-slip device 10 as an integral part while maintaining the tension, and the rubber is filled with the tire cord 16. This will not cause unnecessary deflection.

Thereafter, a mounting hole 14 shown in FIG. 2 is formed in the tire anti-skid device 10 and a hook is attached to the tire slip prevention device 10 to complete the product.

In this tire anti-slip device 10, the tire cord 16 is buried under tension, so even if the tire cord 16 is subjected to large tension, the tire cord 16 does not apply large concentrated stress to the lug material 12 and cause it to deteriorate, improving durability. An excellent tire slip prevention device 10 can be obtained.

Note that, of course, modifications such as providing a hole through which the metal rod 26 can be inserted into the lower mold 20 or the upper mold 22 instead of the lug material groove 24 formed in the lower mold 20 or the upper mold 22 are also possible.

Next, FIG. 5 shows a tire slip prevention device 10 according to a second embodiment of the present invention. In the tire slip prevention device 10 of this embodiment, a plurality of lug materials 30 are arranged in parallel to each other,
The structure is such that rib members 32 intersect and connect these lug members 30 at right angles.

Both ends of the lug material 30 are configured to integrally hold metal hooks 34 that are attachment means to the tire. The hook 34 has a rectangular frame shape, and a tire cord 16 is wound around the lower side of the hook 34, and the outer periphery of the tire cord 16 is filled with rubber to form the lug material 30.

Therefore, in the lower mold 20 and upper mold 22 of this embodiment, a part of the hook 34 protrudes from the lug groove 24, as shown in FIG.
The other part is held in a groove 28 formed in the lower mold 20 and the upper mold 22. Therefore, even if the tire cord 16, which is stretched between a pair of opposing hooks 34, receives tension from the rubber during rubber filling, this tension is reliably supported by the hooks 34, so that the tire cord 16, which is stretched between a pair of opposing hooks 34, is reliably supported by the rubber while maintaining the tension state. Can be integrally molded.

In this embodiment as well, the tire cord 16 is designed to prevent the tire cord 16 from accidentally moving with the hook 34 during rubber filling.
6 may be fixed to the hook 34 in advance.

In this embodiment, since the hook 34 is already integrally attached by molding, there is no need to remove the hook 34 as a tensioning means, and the product can be used as it is, which simplifies production.

In addition, although the tire cord was shown as a flexible reinforcing member in the said Example, other flexible reinforcing members are also applicable.

〔Effect of the invention〕

As explained above, in the manufacturing method of the tire slip prevention device according to the present invention, the elastic body is formed after the flexible reinforcing member is stretched over the tensioning means and tensioned. Fig. 1 is a plan view showing the lower mold with the upper mold removed for producing the tire anti-slip device according to the first embodiment, and Fig. 2 shows the tire anti-slip device produced according to the first embodiment. 3 is a sectional view taken along the line mm--m in FIG. 1, FIG. 4 is a sectional view taken along the IV-TV line in FIG. A plan view showing the locking device, the 6th one is shown in Figure 5 Vl-
FIG. 4 is a sectional view similar to FIG. 3 showing a manufacturing state corresponding to the sectional view taken along the line Vl.

10...tire anti-slip device, 12...Lug material, 16...tire cord, 26...metal rod, 34...Hook.

Claims (2)

[Claims] (1) A method of manufacturing a tire slip prevention device by integrally molding an elastic body around the outer periphery of a flexible reinforcing member, wherein the flexible reinforcing member is stretched over a tensioning means and tensioned, and then the A method for manufacturing a tire anti-slip device characterized by molding an elastic body. (2) The method for manufacturing a tire anti-slip device according to claim (1), wherein the tensioning means is a means for attaching the tire anti-slip device to a tire.