Direct liquid type writing instrument

Abstract

A direct liquid type writing instrument is used without running-over of ink even in an environment in which an internal pressure is higher than an external pressure. The writing instrument includes an ink reservoir containing ink, a junction core extending on a center axis, and a pen body provided integrally on a tip end side of the junction core. The ink reservoir includes a main ink reservoir, a pen core chamber in which the junction core is disposed, and a sub ink reservoir which is provided between the main ink reservoir and the pen core chamber and communicates with the main ink reservoir via a small hole. Between the sub ink reservoir and the pen core chamber, an opening/closing valve is provided to normally isolate the pen core chamber from the sub ink reservoir and to be operated so that the pen core chamber communicates with the sub ink reservoir when the pen body is operated. An ink absorption body capable of absorbing ink is provided in the pen core chamber, and a rod portion, being an ink suction body, which can moves into the small hole is provided at a rear of the opening/closing valve.

Dependencies are inferred from the claim text.