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Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments
(AREA)
Abstract
Improved pens, characterized in that they comprise a hollow container provided, at one end, with an element for writing, and an inserted element forming a channel in the form of a circuit, which communicates with the atmosphere and, in addition, by the fact of that the introduced element limits, on the one hand, a reservoir for the ink in which it can freely move between the said element and the end of the container, provided with the accessory for writing and, on the other hand, forms an expansion channel normally air-filled and of constant section, of the one-step type, for example helical from the container to the atmosphere, at the end of the container, at the opposite end of the writing element; the volume of the container for the ink and the expansion channel of any air occluded in the tank, due to considerable changes in temperature and atmospheric pressure. (Machine-translation by Google Translate, not legally binding)