Mechanism for positioning a measuring instrument on a wall or surface

A mechanism for positioning two or several tools, for example in the form of an implement or a measuring instrument, on a wall or surface, the mechanism comprises:

• a first body comprising a support section with which the mechanism can support and/or drive on a surface or wall;
• at least two tools, which each have a machining surface or a measuring surface, which are movably arranged relative to the first body and the support section;
• and
• driving means for moving the at least two tools relative to the support section and the first body;
• wherein the at least two tools are movably arranged relative to the first body and the support section in such a way that a movement of the at least two tools relative to the support section, allows a tangent plane on the relevant machining surface or the relevant measuring surface, hereafter referred to as the extended operating surface of the at least two tools, to be brought adjoiningly against the wall or surface against which the mechanism is supported;
• the mechanism further comprising:
• control means for controlling the driving means and the at least two tools, which are such that, when the mechanism is supported with the support section in a fixed position on the wall or surface, by the driving means, at the at least two tools of the mechanism are or can be brought alternately with the aforementioned tangent plane on their relevant machining surface or their relevant measuring surface, adjoiningly against the wall or surface against which the mechanism is supported, whereby the relevant tools are alternately centered on a same surface section of the wall or surface which is located at a fixed distance of the support section and whereby the at least two tools operate or can operate alternately on the surface section.