Mitsubishi Pencil Company, Limited

Yoshihiro Manta

Yusuke Nakamura

Kazuhiko Furukawa

Atsushi Nakashima

Kazuhiko Takanashi

Yoshiharu Namiki

Provided is a knock type writing instrument provided with a simple mechanism allowing a stable fretting operation or the like. A knock type writing instrumentis provided with: a shaft cylinder; a refillarranged inside the shaft cylinder; a springbiasing the refillbackward; an operation partpressed forward against a biasing force of the springin a knocking operation; and a main rotor, and is switchable between a writing state and a non-writing state with the knocking operation. The knock type writing instrumentis further provided with: a knock locking membermovable forward and backward inside the shaft cylinderdue to gravity; and a locking partprovided on a side of the shaft cylinderand capable of being locked with the knock locking member. When a front end of the shaft cylinderis directed upward, the knock locking membermoves backward to be locked with the locking partto prevent forward movement of the operation part

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Yokohama, Japan

Yoshihiro Manta