JPH0544969Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Technical Field of the Invention) The present invention relates to improvements in elevator cables. (Technical background of the invention and its problems) Traditionally, mobile cables connected to mobile equipment have been made by providing a tape winding layer on a twisted layer of multiple insulating cores, and then a sheath on top of this. It is known to have a braided structure on which a plurality of insulating cores are twisted together, and a sheath on this braided structure. By the way, in the above-mentioned mobile cable, there is almost no increase in the outer diameter due to the provision of the tape winding layer.
It has the advantage that it is easy to strip off when processing the cable end. However, in a moving cable with such a configuration, when it is used as an elevator cable suspended and installed in a U-shape between the bottom of the elevator and the power supply part in the hoistway, it is difficult to use the multiple insulating cores. There is a tape winding layer on the strands, and this tape winding layer restricts the free movement of the insulating core, resulting in poor cable flexibility and difficulty when the cable is bent in a U-shape. There was a problem that the balance between the insulating cores was poor, and there was also a problem that the cable did not smoothly follow the vertical movement of the elevator, and as a result, kinks were likely to occur in the insulating core. In addition, the mobile cable has excellent flexibility,
Although it has the advantage of good bending balance, it has the problem that the finished outer diameter of the cable increases and it is difficult to strip the braid during terminal processing.
In addition, it had the disadvantage of being expensive. By the way, when considering the balance of the twisting of the insulating core when the elevator cable is bent in a U-shape, it is necessary to directly tube the sheath without providing restraints such as tape or braid on the twisting of the insulating core. Preferably, extrusion coating is performed. Therefore, as a method for manufacturing an elevator cable having such a structure, a method has been devised in which a disposable tape is wound around the twisted insulating core, and this tape is removed when the sheath is extruded and coated. has been done. However, this method of manufacturing cables is difficult to work with, and the force used when removing the disposable tape tends to unbalance the twisting of the insulating core, which can easily cause kink phenomena in the insulating core. It was hot. (Purpose of the invention) This invention was made to solve these problems, and provides an elevator cable that has excellent flexibility and terminal processability, and has almost no increase in outer diameter due to the provision of restraints. The purpose is to (Summary of the invention) The elevator cable of the invention is a cable that is suspended in a U-shape between an elevator and a power supply part, and the cable has a plurality of insulated cores twisted together. Only the yarn is loosely wound in the opposite direction to the twisting direction of the outermost layer, and in such a way that the angle between its own direction and the twisting direction of the outermost layer insulating core is 55 to 75 degrees. It is characterized by being constructed with a sheath. Hereinafter, the present invention will be explained based on the drawings. 1st
The figure is a cross-sectional view of the elevator cable according to the present invention, which is suspended and laid in a U-shape between the elevator and the power supply part. FIG. In these figures, reference numeral 1 indicates an insulating core made by extruding an insulating material such as rubber or vinyl onto a conductor. A resin thread 2 is loosely wound in a direction opposite to the twisting direction of the outermost layer of the insulating core 1, and a sheath 3 is provided thereon by extrusion coating with polyvinyl chloride or the like. Here, as the yarn 2, a single yarn or a twisted yarn is used, and if necessary, two or more types of these single yarns or twisted yarns can be used in combination. On the other hand, the yarn 2 is wound roughly in such a way that the angle θ between the rough winding direction of the yarn 2 and the twisting direction of the outermost layer of the insulating core 1 is always 55 to 75 degrees, as shown in FIG. ing. The reason why the angle θ between the twisting direction of the outermost layer of the insulating core 1 and the rough winding direction of the yarn 2 is limited as described above is as follows. In other words, when the angle θ is less than 55 degrees, the force of the string 2 to restrain the insulating core 1 is insufficient, and when the cable repeatedly bends in a U-shape, "laughing" occurs between the insulating cores 1, and even This is because the twisted state of the insulating core 1 becomes disordered.
In addition, if the angle θ exceeds 75 degrees, the force holding down the insulating core 1 of the thread 2 becomes excessive, contrary to the above.
This is because when the cable repeatedly bends in a U-shape, the movement of the insulating core 1 is hindered, and as a result, the insulating core 1 is more likely to cause a kink phenomenon. (Example of the invention) Next, an example of the invention will be described. [Example] Vinyl insulation core with conductor cross-sectional area of ^0.75mm2 (40 pieces)
are twisted together according to a conventional method, and a cotton thread is loosely wound directly on top of it in a direction opposite to the twisting direction of the outermost layer of the insulating core and at a 65 degree angle with the twisting direction of the insulating core. A polyvinyl chloride sheath was extrusion coated thereon. In addition, for comparison, an elevator cable was manufactured in which a braid was provided in place of the loosely wound cotton yarn. Table 1 shows the measurement results of the outer diameter, flexibility, terminal workability, etc. of these elevator cables obtained as described above. The flexibility of the elevator cable was measured as follows. That is, as shown in Fig. 3, the elevator cable 4 with a length of 5 m is
Bend it in a U shape, and in this state, the width of the U shape at the top of the elevator cable 4 is 60 cm from the bottom.
The width A of the U-shape when the width B of the U-shape at the upwardly rising position is equal to the width A of the U-shape was measured.

【table】

[Table] Next, cotton yarn was loosely wound on the insulating core twisted together in the same manner as in the previous example at different angles of 45 degrees, 65 degrees, and 85 degrees, and then a vinyl sheath was covered by the usual method. did. Each of the cables obtained in this way was set in a U-shape so that the U-width A was 180mm, one end was fixed, and the other end was moved up and down 270mm each 3.5 million times, and then the insulated core I checked the condition.
The results are shown in Table 2.

[Table] (Effects of the invention) As described above, in the present invention, the twisted insulating cores are sufficient to suppress the twisted state of the insulating cores, and to the extent that appropriate slippage is ensured in the insulating cores. The yarn is loosely wound by the restraining force of It is possible to provide an elevator cable in which there is no risk of kink or cracking occurring in the insulating core even after repeated bending movements. Further, in the present invention, since there is no braided restraining layer as in the prior art, it has the advantage of excellent peelability during terminal processing and less increase in outer diameter.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing an example of an elevator cable of the present invention, Figure 2 is an explanatory diagram showing the relationship between the twisting direction of the outermost insulating core and the coarse winding direction of the yarn, and Figure 3 is an elevator cable. It is an explanatory view showing the measurement situation of the flexibility of the cable. 1...Insulating core, 2...Thread, 3...Sheath, 4
...Elevator cable, θ...angle.

Claims (1)

[Scope of utility model registration request] A cable suspended in a U-shape between an elevator and a power supply part, the cable is twisted in a direction opposite to the direction in which the outermost layer of the insulating cores are twisted, and The angle between its own direction and the twist direction of the outermost insulating core is 55
An elevator cable characterized in that the thread is wound roughly at an angle of up to 75 degrees, and a sheath is provided directly above the thread.