JPH0550142U - Inner cable of control cable - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an inner cable of a control cable that is lightweight, has no rust, has excellent durability against repeated bending, and has an elastic elongation within an allowable range. [Structure] A single wire of a thermoplastic synthetic resin such as polyamide of 180 to 350 denier whose core 1 is an aramid fiber bundle bundled to 4000 to 8000 denier and whose outer circumference is super-stretched to have an elastic elongation of 0.1% or less. 4 and the aramid fiber bundle 3 bundled in 180 to 220 denier were wound in two or more layers, and a thermoplastic synthetic resin layer 6 such as polyamide and a fluorine-based synthetic resin layer 7 were sequentially formed on the outer periphery thereof.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an inner cable of a control cable that transmits an operation force in a pulling direction, and particularly to an inner cable using aramid fiber.

[0002]

[Prior Art]

 Conventionally used inner cables consist of twisted metal wires such as galvanized hard steel wires and stainless steel wires, but they are heavy and may cause rust. It has the drawback of low durability when bent and installed in a small radius. Some cables made of synthetic resin are made by twisting or bundling aramid fibers, which have relatively low elastic elongation, but they cannot be used as inner cables for control cables because they have too large elastic elongation.

[0003]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to provide an inner cable for a control cable which is lightweight, has no rust, has excellent durability against repeated bending, and has an elastic elongation within an allowable range.

[0004]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention uses a aramid fiber bundle bundled in 4000 to 8000 denier as a core, and 180 to 350 denier whose outer circumference is super-stretched to have an elastic elongation of 0.1% or less. A single wire of a thermoplastic synthetic resin such as polyamide and a bundle of aramid fibers bundled in 180 to 220 denier are wound in two or more layers, and a thermoplastic synthetic resin layer such as polyamide and a fluorine-based synthetic resin layer are sequentially formed on the outer periphery thereof. It has a configuration.

[0005]

[Operation and effect of the device]

Aramid fiber has a large tensile strength of about 160 kg / mm ² as a synthetic resin, but has an elastic elongation of 2 to 3%, which exceeds the allowable range of the inner cable of 1.0 to 1.5%. However, in the present invention, since the thermoplastic synthetic resin such as polyamide, which has been subjected to super-stretching and has an elastic elongation of 0.1% or less, is wound, the overall elastic elongation is 1.0% or less, which is sufficient as an inner cable. Can be used.

Further, since the thermoplastic synthetic resin layer such as polyamide and the fluorine-based synthetic resin layer are sequentially formed on the outer periphery, the fiber bundles inside are tightly bundled and the sliding resistance with the outer casing is reduced. This has the effect of decreasing the operating force transmission efficiency.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a core in which a large number of thin aramid fibers are bundled into a 6000 denier core, and around the outer periphery thereof, 15 aramid fiber bundles 3 bundled into 200 denier are super-stretched to give an elastic elongation of 0.1. %, The inner winding 2 is formed by wrapping 5 pieces of 320 denier polyamide single wire 4 and further 320 denier that is super-stretched with 20 pieces of the aramid fiber bundle 3 bundled in 200 denier on the outer circumference. An outer winding 5 is formed by winding four polyamide single wires 4.

Then, on the outer periphery of the outer winding 5, a fluorine-based synthetic material such as tetrafluoroethylene for reducing friction between the thermoplastic synthetic resin layer 6 such as polyamide for gathering the fibers inside and the outer casing. The resin layer 7 is sequentially formed.

In addition to polyamide, ethylene terephthalate, polyacetal, polyetherketone, polyetheretherketone, polyethylene and the like are preferable as the thermoplastic synthetic resin that is subjected to super-stretching to reduce elastic elongation.

The inner cable of the above-mentioned embodiment having a diameter of 2.0 mm and the inner cable of 7 × 7 stainless steel wire having a diameter of 2.0 mm, which is the same as the inner cable of the embodiment, are hung on pulleys having radii of 10 mm and 15 mm, and 10 kgf. When a durability test was performed by suspending the weights of the above and repeating the vertical movement, the conventional stainless steel wire inner cable broke after 6000 times in the case of a pulley having a radius of 10 mm, whereas the inner cable of the above example In the case of a pulley having a radius of 15 mm, the inner cable made of stainless steel wire broke at 20,000 times, while the inner cable of the above-mentioned example broke at 70,000 times. Durability of 4 times was recognized.

Further, the elastic elongation when a tensile load of 10 kgf is applied is 0.07% for the conventional inner cable made of stainless steel wire, whereas the inner cable of the above embodiment is 0.3%. The maximum allowable inner cable is 1.0 to 1. 5% is fully satisfied.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an embodiment of the present invention.

[Explanation of symbols]

1: Core 2: Inner winding 3: Aramid fiber bundle 4: Single wire
5: Outer volume 6: Thermoplastic synthetic resin 7: Fluorine-based synthetic resin

Claims (1)

[Scope of utility model registration request] 1. A thermoplastic synthetic resin such as polyamide of 180 to 350 denier whose core has an aramid fiber bundle bundled to 4000 to 8000 denier and whose outer circumference is super-stretched to have an elastic elongation of 0.1% or less. Single wire and 180-220
An inner cable for a control cable, which comprises a denier-bunched aramid fiber bundle wound in two or more layers, and a thermoplastic synthetic resin layer such as polyamide and a fluorine-based synthetic resin layer sequentially formed on the outer periphery thereof.