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Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments
(AREA)
Abstract
A perfected pencil characterized by the fact that the pencil or mine is guided by a tubular conduit made by the interior of the pencil in its upper part; forcing its tip to protrude at the end of said pencil by the pressure on its base exerts a rod of equal caliber to the mine and which in turn is guided by the aforementioned conduit itself. The fact that the ascending or descending movement of this rod is achieved by joining together in a lower part to a flat blade or cursor; which can slide inside the diametral groove of a cylindrical part located concentrically inside the pen engages or threaded by its projecting serrated edges with separate threads made around the inner walls of the pen so that when rotating the cylindrical piece will be achieved in one direction or another displacement of the rod or plunger. (Machine-translation by Google Translate, not legally binding)