Importance

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Abstract

A writing instrument that includes a barrel extending longitudinally from a rear end to a forward end having an opening; a writing member having a writing tip at a forward end longitudinally movable inside the barrel between a retracted position and an extended position for which the writing tip projects through the forward opening; a sealing sleeve that can move longitudinally inside the barrel along a predetermined stroke between a withdrawn position and an advanced position and having rear and forward ends presenting rear and forward openings respectively, through which the writing member can slide, where the sealing sleeve is propelled between positions by the writing member when the latter is moved between the retracted and extended positions; and a closure device able to allow the passage of the writing member through the forward openings of the sleeve and barrel when the sleeve is in the advanced position, and substantially to seal off the forward opening of the sleeve when the latter is in the retracted position with the writing tip housed inside said sleeve.

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First Claim