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Also, since a liner containing a specific organopolysiloxane is used in the control cable of the present invention, glorious load efficiency is continued for a protracted time period. In the present invention, a thermoplastic resin is used within the interior coat which is formed on the floor of an internal cable. The polybutylene terephthalate also has a characteristic that the distinction of the preliminary load efficiency and the load efficiency after the control cable is operated for a long period of time is small. The polybutylene terephthalate is great in thermal resistance, oil resistance and abrasion resistance, and has a low coefficient of friction. The smaller the melt index of the polybutylene terephthalate is, the better the sturdiness such as abrasion resistance and stress-cracking resistance is, but it surely tends to be tough for carrying out the extrusion molding. The tetrafluoroethylene perfluoroalkylvinyl ether copolymer and the tetrafluoroethylenepentafluoroproylene copolymer might be employed in an extrusion molding by heating to melt. The tetrafluoroethylene-perfluoroalkylvinyl ether copolymer is prescribed in ASTM D 3307, and has two types, i.e. Type I and sort II.

The type II has a polymerization degree higher than the type I, and is excellent in stress-cracking resistance. It is preferable to make use of the type III and sort IV because the sort I and sort II having a small polymerization diploma are poor in stress-cracking resistance. Seven steel wires are twisted to acquire one strand, and seven strands are twisted to acquire a wire rope with 7.times.7 development and an out of doors diameter of 3.Zero mm. The variety of the strands used within the interior cable 1 and the variety of the steel wires used within the strand usually are not notably limited, and conventionally recognized various mixture thereof might be employed. Hereinafter, the control cable of the present invention and the technical effect are defined in detail with comparing some examples and comparative examples. General management and coordination of the operators work are duties of the shift chief or his deputy. As talked about above, because the management cable of the present invention does not necessitate a lubricant, an issue regarding workability for coating a lubricant is solved and irregurality of load effectivity of merchandise due to the uneveness of coating isn't generated.

The polyoxymethylene additionally has properties similar to low stickslip underneath a excessive load and improves the operationability of a management cable. FIG. 1 is a partially-cut-off perspective view showing one embodiment of the pull type management cable of the current invention. Although melt viscosity of the sort II is 6 to 7 instances larger than that of the sort I, the sort II is appropriate for uses necessitating durability as a result of the sort II will be employed in an extrusion molding. When the melt index of the high density polyethylene is less than 0.01 g/10 minutes, the extrusion molding turns into troublesome, and there is a tendency that the internal coat can't be fastened on a stranded steel wire. When the melt index is more than 5 g/10 minutes, there's a tendency that bending power, impression resistance and abrasion resistance deteriorate. Accordingly, it is preferable that the melt index is not less than 0.1 g/10 minutes. Accordingly, it is preferable that the melt index is at most 5 g/10 minutes. Accordingly, it is preferable that the melt index is 0.5 to 5 g/10 minutes.

Accordingly, it's preferable that the melt index is 0.01 to 5 g/10 minutes. When the melt index is more than 5 g/10 minutes, there's a tendency that oil resistance, stress cracking resistance and abrasion resistance deteriorate. Among the thermoplastic resins used in the internal coat, polybutylene terephthalate, excessive density polyethylene, polyoxymethylene and polyphenylene-sulfide are particularly preferable because these are excellent in abrasion resistance. The polyoxymethylene is great in abrasion resistance and has a low abrasion coefficiency. Representative examples of the polyoxymethylene are, for instance, DELRIN commercially accessible from Du Pont, Celcon commercially out there from Hoechst Celanese, and the like. Among them, polyoxymethylene is preferably utilized in the current invention because a stickslip is hardly generated when polyoxymethylene is used. The polyphenylene-sulfide is divided broadly into two teams of a crosslinked prepolymer and a linear prepolymer, and these could be used in the current invention. Examples of the thermoplastic resin are, for example, polybutylene terephthalate, excessive density polyethylene, polyoxymethylene, a fluorocarbon resin represented by polytetrafluoroethylene, a polyamide represented by 6,6-nylon, polyphenylene sulfide, and the like, shield control cable but the current invention isn't limited by the exemplified ones. When the paste-extrusion technique is employed, it is preferable that paste is prepared by including kerosene to polytetrafluoroethylene powder and kneading them, the paste is extruded to present a tube underneath excessive strain and a stranded steel wire is coated with the tube, and after that, the stranded steel wire is dried and baked in a furnace corresponding to an electric furnace.