| 摘要 |
The specification relates to a supporting arm capable of being turned freely itno different positions, which is made up of at least two straight sections articulated to each other, such a section containing a parallelogram formed by articulated arms in such a way that the ends of the same description of the two long parallel articulated arms (8, 6) of the parallelogram are articulated to a common end piece (2, 12), and, additionally, there being linked to the first articulated arm (8) a tension bar (7) exerting its effect by spring force, the tension bar preventing the parallelogram from collapsing. The object is to provide a supporting arm which has a substantially smooth outer surface and is therefore easy to keep clean and pleasant to handle, and which is furthermore, very sturdy mechanically. In order to achieve this, the second longitudinal articulated arm (6) of the parallelogram is implemented as a tube which surrounds the first, spring-affected articulated arm (8), the articulation points (3, 13) at the ends of the tubular articulated arm (6) preferably being situated outside the center line of the tube. The tubular articulated arm (6) may have an oval cross section in such a way that its sides are substantially flat, the spring-affected articulated arm (8) preferably being situated on the opposite side of the center line of the tube in relation to these articulation points (3, 13). |
