Writing implement
AssigneeMitsubishi Pencil Company, Limited
InventorsTooru Nakajima, Takeo Fukumoto, Gouya Oono
Life of this patent
Estimating the term…
Abstract
An object is to provide a writing implement allowing the width of a drawn line to be freely changed by writing pressure that is capable of application to a narrow-shafted felt-tip pen or marker pen. The writing implement includes a shall tube, an ink supply core that is housed inside the shaft tube and that guides ink by capillary action, and a core surrounding member that is fitted to a leading end of the shaft tube, that is penetrated by the ink supply core, and from which a tip of the ink supply core projects. The ink supply core is configured to retract at a tip of the core surrounding member under writing pressure, and a projection dimension of the ink supply core from the tip of the core surrounding member is from 0.05 mm to 0.7 mm.
Claims11
A writing implement comprising:
- a shaft tube;
- an ink supply core that is housed inside the shaft tube and that guides ink by capillary action;
- and
- a core surrounding member that is fitted to a leading end of the shaft tube, that is penetrated by the ink supply core, and from which a tip of the ink supply core projects,
- the ink supply core being configured to retract at a tip of the core surrounding member under writing pressure, and
- a projection dimension of the ink supply core from the tip of the core surrounding member being from 0.05 mm to 0.7 mm when not being used to write,
- the core surrounding member including a tip portion, a rear end portion, and an elastic portion between the tip portion and the rear end portion,
- the elastic portion enabling the ink supply core to retract together with the rear end portion, and
- the elastic portion elongating rearward under writing pressure.
Dependencies are inferred from the claim text.