Pentel Kabushiki Kaisha

Takashi Tamura

Yoshihiro Wada

Masamitsu Nagahama

Masayuki Kawasaki

Kazunori Suzuki

Kazuo Sakai

Koichi Enuma

Hishao Fukui

Yutaka Shinohara

Hiroshi Hasegawa

This invention relates to a writing instrument wherein a temporary ink storage member made of a synthetic resin injection molded article is sandwiched between a pen tip and an ink tank. In the present invention, a flange portion for fitting to a predetermined apparatus, which is positioned around an outer peripheral portion of the temporary ink storage member, is formed integrally with a shaft made of a synthetic resin injection molded article. In embodiments of the invention, the temporary ink storage member is made flexible, the shaft is made of a material which is softer than that of the tip holder, and the tip holder is used as a writing thickness display member. The temporary ink storage member can be used as an ink color display member and a cap is used as an application display member. In other embodiment, the cap can be fitted selectively in accordance with types of writing instruments.

Writing instrument

A writing instrument having a needle-like longitudinal writing nib, longitudinally slidably positioned in a nib holder pipe. The writing nib has flex portions and/or a flattened portion, for facilitating a longitudinal movement thereof when a writing pressure is added.

Resilient writing nib with offset flattened portion

Growing community of inventors

Saitama, Japan

Takashi Tamura