| 摘要 |
According to the invention, this guiding device is characterised in that the guiding volume 2 has at least two surface portions 3 facing each other and belonging to a substantially cylindrical internal surface, which are separated from each other each time by the elongate slot 4 or by cuts 5, 6 in the shape of grooves extending in the longitudinal direction, in that the guiding head 7 is formed by a flat base body 8, in which at least one ball 9, acting as a bearing element, is mounted in a rotating manner and is prevented from turning with respect to the base body 8, the diameter of which ball is smaller than that of the internal cylinder of the guiding volume 2 and greater than each width of opening of the cuts 5, 6 or of the elongate slot 4. <IMAGE>
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