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Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments
(AREA)
Abstract
A mechanical pencil essentially characterized in that it is constituted by a tubular body molded or internally configured so that it has a thread that can be traversed by a small externally threaded sleeve surrounding a thin longitudinally slit tube for the passage of an appendix of the said sleeve, inside which split tube is housed the displaceable lead of the pencil so that it is pushable or draggable by said appendix, acting at its opposite end to the tip, as the threaded sleeve driven by the rotation of the tube Cleft produced by the user of the pencil runs, by turning accordingly, the internal thread of the body of the pencil in one direction and another. (Machine-translation by Google Translate, not legally binding)