Electric positioning apparatus

Claim 1

Positioning apparatus comprising: a base, a non-elongatable first element pivotably mounted onto said base for pivotable positioning relative thereto about a first pivot axis only; a second element pivotably mounted onto said first element for pivotable positioning relative thereto about two pivot axes one substantially parallel to and one substantially perpendicular to said first pivot axis; first axially elongatable means mounted pivotably onto said base and pivotably connected to one of said first and second pivotably elements for selectable positioning of said first element about said first pivot axis said first axially elongatable means lying at an angle to a first plane extending through said first element and through said first pivot axis; and second axially elongatable means mounted pivotably onto said base and said second element at a distance from its pivoting connection with said first element for selectable positioning of said second element with respect to said pivot axis substantially perpendicular to said first pivot axis said second axially elongatable means comprising two axially elongatable elements arranged in a plane generally parallel to said first plane and having elongation axes which are angled with respect to each other and converging towards each other from said base to said second element.