| 摘要 |
The invention relates to a device comprising plates (33 and 34) which are connected by means of an axle (437) that extends through the guiding piece (414) and the ball joint element (12) which are positioned at the ends of the column tube (5). The rotating elements (16 and 11) are disposed in the plates and enable same to rotate around the aforementioned axle (437) which is blocked in rotation by the guiding piece (414). The guiding piece (414) comprises a concave spherical surface (420) which is coupled to the convex surface (421) of the eccentric (45) which is equipped with a bore (50) that is off-centre in relation to the vertical axis of the spherical surfaces and a flat surface (60) which is perpendicular to the axis of the bore. According to the invention, an eccentric (415) pivots in the bore (50) and on the surface (60) by means of a cylinder (51) and a surface (61), said eccentric being equipped with a bore (70) that is off-centre in relation to the cylinder (51). The combined reverse rotation of the eccentrics enables the assembly to pivot around the axis (30).
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