Patent ID: 9539848
Date: 2017-01-10
CPC Classifications: B43K

Claim:
1. A writing instrument comprising a barrel extending along a longitudinal axis and a tip mounted at the front of the barrel, further comprising a protective sleeve for the tip, the sleeve being mounted coaxially on the barrel and movable relative to the barrel between a protective position where it covers the tip and a retracted position where it exposes the tip to allow writing, the sleeve having an inner wall which comprises a helical cam engaging with a guide element formed on the barrel so that the sleeve is movable in translation combined with rotation, the sleeve further comprising on its inner wall a detent element capable of engaging with a retaining element formed on the barrel so as to prevent the sleeve from being detached from the barrel, the retaining element forming a retaining tooth having an apex as well as a first face and a second face arranged on each side of the apex, wherein the sleeve comprises a locking element distinct from the detent element and which is capable of engaging with one among the retaining element and the detent element so as to rotationally lock the protective position of the sleeve.