| 摘要 |
The connecting section includes two metal sections held spaced from each other by at least one isolating bar having at least one recess extending longitudinally therein. Each of the metal sections are provided with at least one isolating bar-receiving groove and at least one grooved longitudinal member. Each of the grooved longitudinal members of the metal sections are fitted in a recess in the isolating bars by elastic deformation and each of the isolating bars have at least one slot opening to the adjacent metal section. The metal wire is sunk into the metal section and the isolating bar on deformation of the grooved longitudinal member. To provide a more uniform sinking of the metal wire in the slot over the entire length of the metal section, the metal wire (11) is made up of a linear core wire strand (12) and an outer wire strand (13) helically wound about the core wire strand (12) in a plurality of coil turns (14), adjacent turns of the outer wire strand being spread apart so that they do not contact each other (FIG. 3).
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