| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To facilitate cable installation work by reducing friction resistance that is brought about between the surface of the cable sheath and the cable installation surface in cable extension, without using a lubricant at cable installation work. <P>SOLUTION: A plurality of protrusions 3 which are made along longitudinal direction are provided in the circumference direction on the surface 2 of the cable sheath, and undulations are formed on the protrusions 3 so that the maximum length of protrusion of the protrusions 3 from the surface 2 of the cable sheath is at least [ä1/cos (θ/2)}-1]×r, when the radius of the cable is made as r and the angle between the adjoining protrusions 3 is made asθ. <P>COPYRIGHT: (C)2004,JPO</p> |
