Patent ID: 7331730

Claim:
A retractable-nib writing tool having a retractable writing body slidable in forward and backward directions in a shaft tube and having a sealing lid and a sealing tube which seal a writing nib of the writing body in association with the forward and backward movements of the writing body, wherein: the sealing lid is independent of and not mounted to the sealing tube, the sealing lid and a guide tube fixed to the writing body are linked by a plurality of thin line portions, the thin line portions are disposed at equal intervals around the sealing lid and constitute therewith a unitary structure, and the sealing lid is opened and closed relative to the sealing tube by the forward and backward movements of the thin line portions; and wherein at least one thin line portion out of the plurality of thin line portions which are advanced by the forward motion of the guide tube is regulated and other thin line portions can be flexibly bent and deformed.