JPH04315702A - Cable for elevator - Google Patents

Abstract

PURPOSE:To prevent breaking of a second wire core group so as to alleviate limitation of use and enhance durability by arranging the second wire core group of a twist pair, shield, optical fiber and the like more apart than a first wire core group of ordinary wires from a reinforcement wire. CONSTITUTION:In a flat type cable for an elevator, a first wire core group 3 consisting of ordinary wires is arranged around a reinforcement wire 1 while a second wire core group 4 consisting of a twist pair wire 5, shield wire 6, optical fiber core 7 and the like is arranged in a distant side. Consequently, around the second core group 4, distortion of a sheath 8 is small and breaking of wires 5, 6, 7 and the like is prevented. The first core group 3 is provided with much play structurally in a twisting process and the like and therefore can follow the sheath 8 even when distortion thereof is large, thus preventing generation of inconvenience.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable for a lifting device such as an elevator control cable, and more particularly to a cable for a lifting device having a reinforcing wire.

0002

[Prior art] Fig. 2 shows, for example, Utility Model Application No. 58-192862.
FIG. 2 is a cross-sectional view of a conventional elevator flat cable similar to that shown in the above publication. In the figure, two reinforcing wires (steel cores) 1 are provided at a distance from each other. On the outside of the two reinforcing wires 1, two first wire core groups 3 each made of a large number of ordinary wires 2 twisted together are arranged. Also,
Two second wire core groups 4 are arranged between the two reinforcing wires 1. The second wire core group 4 is made up of twisted pair wires 5 for weak control signals, shielded wires 6 for audio signals, and optical fiber wires 7 for high-capacity data communication. These reinforcing wires 1, first core group 3, and second core group 4 are entirely covered with a sheath 8.

0003

[Problems to be Solved by the Invention] In the conventional elevator flat cable constructed as described above, when it is suspended between the car and the hoistway by the reinforcing wire 1, the sheath 8 is distorted due to its own weight. . FIG. 3 shows the distribution of strain that occurs in the sheath 4 when the above flat cable is suspended by the reinforcing wire 1. When the elevator is operated in such a state, the sheath 4 around the reinforcing wire 1 is repeatedly strained due to cable bending, load fluctuations applied to the reinforcing wire 1, and the like. This distortion also affects the first and second wire core groups 3 and 4 near the reinforcing wire 1. At this time,
The twisted pair wires 5, the shielded wires 6, the optical fiber wires 7, and the second core group 4 have less play in twisting than the first core group 3, so the cores are not likely to break due to distortion. There was a problem that there was. This tendency is more pronounced the more the sheath material is soft or the sheath material is high, and the use of the cable may be restricted.

[0004] This invention was made with the aim of solving the above-mentioned problems, and it reduces the distortion of the sheath around the second wire core group, thereby improving twisted pair wires and shielded wires. Another object of the present invention is to obtain a cable for a lifting device that can prevent breakage of a core such as an optical fiber line.

[0005]

[Means for Solving the Problems] A cable for a lifting device according to the present invention has a second core group such as a twisted pair wire, a shielded wire, an optical fiber wire, etc. reinforced more than a first core group of ordinary wires. It is placed away from the line.

[0006]

[Operation] In this invention, by separating the second core group from the reinforcing wire, the distortion of the sheath around the second core group is reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a flat elevator cable according to an embodiment of the present invention, and the same or corresponding parts as in FIG. 2 are given the same reference numerals, and the explanation thereof will be omitted. In the figure,
Two first wire core groups 3 are arranged in the center of the cable, and two reinforcing wires 1 are arranged on both sides thereof. Furthermore, one first core group 3 is arranged on each side, and one second core group 4 is arranged on the outermost side, that is, one on each side in the cable width direction.

In the elevator flat cable constructed as described above, the first core group 3 is arranged around the reinforcing wire 1, and the second core group 4 is arranged on the side far from the reinforcing wire 1. Therefore, the distortion of the sheath 8 around the second wire core group 4 is small, and breakage of the wire cores such as the twisted pair wire 5, the shield 6 wire, and the optical fiber wire 7 is prevented. On the other hand, since the first wire core group 4 is structurally given a lot of play during the twisting process, even if the sheath 8 has a large distortion, it can follow this and no inconvenience occurs.

[0009] In the above embodiment, a flat cable for an elevator is shown as a cable for a lifting device, but for example, a round cable may also be used, and the present invention can also be applied to lifting devices other than elevators, such as those for a building exterior wall cleaning device. is applicable. Further, the number of each of the first and second core groups 3 and 4 and the number of cores included therein are not limited to those in the above embodiment. Furthermore, in the above embodiment, the second wire core group 4 includes the twisted pair wires 5, the shielded wires 6, and the optical fiber wires 7.
It is sufficient that the wire core group has at least one of these. Alternatively, it may include a coaxial cable.

0010

Effects of the Invention As explained above, in the cable for a lifting device of the present invention, the second core group having twisted pair wires, shielded wires, optical fiber wires, etc. is separated from the first core group of ordinary wires. Since the reinforcing wires are placed away from the reinforcing wires, distortion of the sheath around the second core group is reduced, thereby preventing breakage of cores such as twisted pair wires, shielded wires, and optical fiber wires. , it is possible to ease usage restrictions and improve durability.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a flat elevator cable according to an embodiment of the present invention.

FIG. 2 is a sectional view of an example of a conventional elevator flat cable.

3 is a diagram showing the relationship between the position in the cable width direction and the amount of sheath strain, showing the strain distribution of the sheath in FIG. 2; FIG.

[Explanation of symbols]

1 Reinforcement line 2 Normal line 3 First wire core group 4 Second core group 5 Twisted pair wire 6 Shield wire 7 Optical fiber line 8 Sheath

Claims (1)

[Claims] [Claim 1] A first wire made of a plurality of ordinary wires twisted together.
a second core group formed by twisting together a plurality of at least one of twisted pair wires, shielded wires, and optical fiber wires; a reinforcing wire; In the cable for a lifting device, the distance between the reinforcing wire and the second wire core group in the cross section is equal to the distance between the reinforcing wire and the first wire core group. A cable for a lifting device characterized by being larger than the distance from the wire core group.