HYDRAULICALLY-CONTROLLED WRITING INSTRUMENT

摘要

The invention relates to a hydraulically-controlled writing instrument, comprising a hollow body (3), extending longitudinally between a writing end (15) and a distal end (17), a sac (5), containing a fluid, a writing tip (46), displaceable parallel to the central axis (X) between at least one extended position and a withdrawn position and a support mechanism (7, 41, 49) for the writing tip (46), to hold the writing tip (46) in the extended position. The support mechanism (7, 49) is active and retains the writing tip (46) in the extended position without any particular action on the part of the user.