Double-head writing instrument
AssigneeThe Pilot Ink Co., Ltd.
InventorShigeru Oike
Life of this patent
Estimating the term…
Abstract
A double-head writing instrument has a barrel having a partition formed inside thereof, first and second ink-tanks provided inside the barrel so as not to communicate each other, first and second ink-retaining members connected with first and second nibs provided on an opening of the first and second ink-tanks, respectively, first and second ink reserved inside first and second ink-reservoirs, respectively. The partition is extended in an axial direction so as that the first and second ink-reservoirs overlap each other in a radial direction, and thickness C of the partition and thickness D of a side wall of the barrel connected with the partition satisfy a relation of 0.2≦C/D≦2.5.
Claims8
A double-head writing instrument, comprising:
- a barrel formed by injection molding of transparent synthetic resin, the barrel opened at first and second ends thereof, the barrel having a partition formed therein;
- first and second ink-tanks provided inside the barrel and defined by the barrel and the partition so as not to communicate each other, the first and second ink-tanks opened at the first and second ends of the barrel, respectively;
- a first ink-retaining member connected with a first nib provided on an opening of the first ink-tank;
- a first ink reserved inside a first ink-reservoir which is provided inside the first ink-tank and at rear of the first ink-retaining member;
- a second ink-retaining member connected with a second nib provided on an opening of the second ink-tank;
- and
- a second ink reserved inside a second ink-reservoir which is provided inside the second ink-tank and at rear of the second ink-retaining member,
- wherein the first and second ink-retaining members retain temporarily the first and second ink spilled in accordance with an increase in pressure inside the first and second ink-reservoirs, respectively,
- the partition is extended in an axial direction of the writing instrument so as that the first and second ink-reservoirs overlap each other in a radial direction, and
- thickness C of the partition and thickness D of a side wall of the barrel connected with the partition satisfy a relation of 0.2≦C/D≦2.5,
- wherein inclined surfaces slanting relative to the axial direction are provided on an inner surface of the partition on the first ink-reservoir side and second ink-reservoir sides, respectively.
A double-head writing instrument, comprising:
- a barrel opened at first and second ends thereof, the barrel having a partition integrally formed therein;
- first and second ink-tanks provided inside the barrel, defined by the barrel and the partition so as not to communicate each other, and opened at the first and second ends of the barrel;
- a first ink-retaining member connected with a first nib provided on an opening of the first ink-tank;
- a first ink reserved inside a first ink-reservoir which is provided inside the first ink-tank at rear of the first ink-retaining member;
- a second ink-retaining member connected with a second nib provided on an opening of the second ink-tank;
- and
- a second ink reserved inside a second ink-reservoir which is provided inside the second ink-tank at rear of the second ink-retaining member,
- wherein the first and second ink-retaining members retain temporarily the first and second ink spilled in accordance with an increase in pressure inside the first and second ink-reservoirs, respectively,
- inclined surfaces slanting relative to an axial direction of the writing instrument are provided on an inner surface of the partition on the first ink-reservoir side and second ink-reservoir side, respectively.
Dependencies are inferred from the claim text.