JPS6318821Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an inner wire made of steel cables made by twisting thin steel wires together.
The object of the present invention is to provide an inner wire that is easy to manufacture and has excellent slip properties, wear resistance, and corrosion resistance.

Traditionally manufactured inner wires are made by baking and drawing steel wires, twisting them together into the desired number of wires, and then tin-plating them, or by adding a zinc layer to the steel wires. It is known that the wire is then drawn and then twisted into a desired number of wires to form a single wire, which is then electroplated with tin.It is used by being inserted into a flexible threaded pipe, and is a familiar wire. In some cases, it is used as a steel cable that connects the operating lever and brake simmer in a bicycle brake system. However, the above conventional product,
It had many shortcomings in corrosion resistance, abrasion resistance, and slipperiness. That is, the former conventional product is made by applying tin plating to a drawn wire and twisting the desired number of wires together, so many unevenness and pinholes are generated on the surface of the tin plating due to the plating. When used by inserting it into a flexible threaded tube as an outer tube, it not only has poor slip properties but also has particularly poor corrosion resistance. Furthermore, the latter of the conventional products is made by drawing and twisting the desired thin wires to form a single wire, which is then plated with tin.Since the entire twisted thin wires are surrounded by a layer of tin, it is highly durable. Corrosion has some effect, but the unevenness and pinholes during plating make it difficult for the wire to slide inside the outer tube, and the wire may be surrounded all around each drawn thin wire. Because it is not plated like
Parts that are not tin-plated may be subject to accelerated corrosion due to moisture seepage through pinholes.

Therefore, after applying lubricating oil on top of the tin layer for corrosion protection, the wire is drawn to the desired thinness, and the drawn steel wire is twisted in an appropriate number of wires. An inner wire has been devised in which lubricating oil is injected between steel wires to form an oil layer. However, such an inner wire has a problem in that if the viscosity of the lubricating oil decreases due to aging, it will not function sufficiently as a lubricating oil.

In addition, since both types have poor slip properties, they are filled with grease for lubrication when inserted into the outer tube, but when the outer tube is bent, the grease is wrapped around the outer tube in a spiral shape. A gap is created between the side surfaces of the steel wires that join each other, and grease leaks from this gap. Therefore, the outer tube through which the inner wire has been inserted must be inserted into the vinyl pipe and covered. Moreover, vinyl pipes for bicycles and the like are limited to black ones in order to hide grease leakage from decorative surfaces, which is not very aesthetically pleasing.

Furthermore, a technique is disclosed in, for example, Japanese Patent Laid-Open No. 52-33944, in which each wire, that is, an inner cable made of twisted metal wires, is coated with resin. According to the above, the wear and tear caused by the rubbing of the twisted wires, that is, the metal wires against each other, could not be eliminated unless lubricating oil was supplied.

This idea was created in view of the various drawbacks of the conventional wires mentioned above, and lubricating oil is required for the rubbing of the wires together due to twisting.
If this is applied to the steel wire in advance, it cannot be coated with resin or plating, and if it is coated first, lubricating oil must be supplied between the wires, and in that case, the wires may be damaged due to lack of lubricating oil. The purpose of this is to solve the fundamental problem of not being able to prevent wear due to friction or lack of lubricating oil required between the wire and the outer wire.

Next, the inner wire of this invention will be explained in detail based on the drawings showing one embodiment thereof.

A zinc layer 2 is formed on the raw material steel wire by electroplating, and on top of that, a solid lubricant such as molybdenum disulfide or polyethylene fluoride resin (trade name: Teflon) is mixed with nickel as the base material for plating. A composite plating layer 3 is formed by electroplating the material,
After that, the wire is drawn to the desired thinness. The inner wire of this invention is constructed by twisting an appropriate number of the drawn steel wires 1 together.

To explain the effects of the inner wire having the above structure, the entire surface of the drawn steel wire 1 is coated with a composite plating layer 3 made of a plating material mixed with a solid lubricant, and the wire is drawn after plating. As the unevenness and pinholes during plating are completely removed, it has extremely good sliding properties, and there is no need to apply lubricating oil or form an oil layer as in the past. This eliminates the decline in lubricity due to aging of oil and maintains good lubricity over a long period of time. Furthermore, when the outer pipe is bent, grease will not leak out from the gap between the bends, so when used in bicycle brake systems in particular, the vinyl pipe used to cover these pipes should be transparent or coated with various colors and patterns. You can enhance the decorative effect by using objects.

In addition, the zinc layer 2 formed under the composite plating layer 3 has an extremely high rust prevention effect, and the double plating layer also provides corrosion resistance several times longer than conventional ones. resistance occurs. In other words, in the conventional method, tin plating is performed after wire drawing, which requires a degreasing process, and the caustic agent, or alkaline agent used during this degreasing, remains on the twisted wire itself, so it has no rust-preventing effect. However, the wire according to the present invention eliminates the above drawback by forming the zinc layer 2 before wire drawing. Furthermore, since nickel is used as the plating base material of the composite plating layer 3,
Even if a steel wire is used as the wire, it is possible to obtain the same corrosion resistance as when a stainless steel wire is used. Moreover, nickel has similar physical properties to iron and is softer than chromium, so it does not impair the physical properties of the steel wire itself. Since it has excellent corrosion resistance, it does not discolor and maintains stable decorative properties.

As mentioned above, the inner wire of this invention utilizes the action of composite plating to coat steel wire with a plating material that is a mixture of nickel as the plating base material and molybdenum disulfide or polyethylene fluoride resin as a solid lubricant. Because it is a coated wire, the manufacturing process is simpler than conventional resin coating, and it has the advantage of being more durable than resin.Moreover, it has the advantage of being coated with resin after twisting the wires together. However, since the solid lubricant covers each wire itself, there is no need to consider replenishing the lubricating oil. do not have. Therefore, there is an advantage that there is no wear and tear due to lack of lubricating oil, and as described above, it exhibits excellent practical effects in terms of wear resistance, corrosion resistance, slipperiness, and rust prevention. Furthermore, since no grease is required when inserting the outer tube, it can enhance the decorative effect especially when applied to bicycle brake devices, and is a revolutionary product with high practical value that can be manufactured at low cost. It is something like that.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the inner wire according to this invention. 1... Steel drawn wire, 2... Zinc layer, 3... Composite plating layer.

Claims (1)

[Scope of utility model registration request] A composite plating layer made of a plating material that is a mixture of nickel as a plating base material and molybdenum disulfide or fluororesin as a solid lubricant is provided on a steel wire directly or via a zinc layer, and multiple steel wires are made as they are, Or inner wire made by drawing and twisting.