Synthetic resin pen unit
AssigneeThe Pilot Ink Co., Ltd.
InventorsAkio Ito, Hiroshi Kato
Life of this patent
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Abstract
A synthetic resin pen unit has a cylindrical outer annular member with inwardly extending bent and straight members. Each bent member has a base portion extending from the inner wall so that it is inclined with respect to a phantom line connecting the base of the bent member to the central axis of the cylindrical member. Ink grooves are formed between the inwardly extending members. The flexibility of the pan unit is a function of the percentage of bent members so that by proper selection and arrangement the pen characteristics can be optimized.
Claims3
A pen unit comprising, in cross-section, a number of synthetic resin elements fused in the axial direction to form a capillary pen nib, said nib having an outer annular cylindrical member and is hollow at its circumferential center, a plurality of curved bent members extending inwardly from said cylindrical member toward said hollow center, said plurality of curved bent members uniformly circumferentially spaced thereon, said nib devoid of any inwardly extending straight members, said curved bent members comprise alternate long and short bent members and said long bent members comprise a base portion bent in a first direction and a top portion which is bent in a second direction and extending toward the central axis of the pen.
Dependencies are inferred from the claim text.