Improved frame model for planning board (Machine-translation by Google Translate, not legally binding)

摘要

An improved model of a frame for planning board, based on a rectangle of sides with hollow parallelepiped section and in which inside the two horizontal sides there are two endless screws whose movements are chords by the effect of a transmission that runs inside one of the vertical sides and by the effect of conical pinions mounted at their ends. The movement that must be carried out manually and is conceived by the effect of a control wheel mounted on the end of one of the screws s.f. (Machine-translation by Google Translate, not legally binding)