Abstract: An optical fiber cable of a structure comprising optical fibers, cushion layers supporting the fibers by way of low friction layers and a strengthening member provided lengthwise along the cable, wherein concentrated tension and compression applied to the optical fibers due to the external bending force can be dispersed through the cushion and low friction layers and the tension applied to the entire cable can be received by the strengthening member.

Abstract: Manufacturing of a soft metal sheath formed of aluminum or copper, for example, is improved by suitably selecting the apparatus composing the shaping means employed therein and arranging the capstan and the sinking die in a novel manner. The apparatus selected is made from a wear-resistant synthetic resin such as a molybdenum bisulfide-included nylon. The sheath is manufactured from a metal tape of aluminum or copper through the working stages of applying a cylindrical tube shaped from the tape onto a cable core, butt welding the seam, and then reducing the diameter of the metal tube to connect it to the core.