EP-4741174-A1 - WRITING INSTRUMENT AND INK STORAGE MEMBER

EP4741174A1EP 4741174 A1EP4741174 A1EP 4741174A1EP-4741174-A1

Abstract

In the present invention, a writing instrument 1 includes a shaft cylinder 2, an ink storage body 6 disposed inside the shaft cylinder 2 and impregnated with ink, an ink replenishment part 10 that is disposed behind the ink storage body 6 and that has a ventilation hole 12 and an ink discharge hole 13, and an ink storage member 20 that can be attached to a rear end part of the shaft cylinder 2 and can store ink. When the ink storage member 20 is attached to a rear end part of the shaft cylinder 2, the ink in the ink storage member 20 can be supplied to the ink storage body 6 through the ink discharge hole 13 of the ink replenishment part 10.

Inventors

TSUKADA, KAITO
KAMITANI, TOSHIMI

Assignees

MITSUBISHI PENCIL COMPANY, LIMITED

Dates

Publication Date: 20260513
Application Date: 20240703

Claims (3)

A writing instrument comprising a shaft barrel, an ink reservoir arranged inside the shaft barrel and impregnated with ink, an ink refilling part arranged at the rear from the ink reservoir and having an air hole and ink discharge holes, and an ink storage member able to be attached to a rear end part of the shaft barrel and able to hold ink and, configured so that when attaching the ink storage member to a rear end part of the shaft barrel, the ink inside the ink storage member can be supplied to the ink reservoir through the ink discharge holes of the ink refilling part.
The writing instrument according to claim 1, wherein the air hole is provided on a center axis of the shaft barrel than the ink discharge holes and the ink discharge holes are provided concentrically cylindrically about the center axis.
An ink storage member for a writing instrument able to be attached to a rear end part of a shaft barrel inside of which an ink refilling part having an air hole and ink discharge holes and an ink reservoir impregnated with ink are arranged, which ink storage member configured so that if attached to the rear end part of the shaft barrel, the ink can be supplied to the ink reservoir through the ink discharge holes of the ink refilling part.

Description

FIELD The present invention relates to a writing instrument and ink storage member. BACKGROUND Known in the art is a writing instrument having an ink reservoir arranged inside a shaft barrel and impregnated with ink and a writing core of a pen tip discharging ink guided from the ink reservoir (for example, PTL 1). As such a writing instrument, a paint marker, oil-based marker, water-based marker, underline marker, etc. may be mentioned. If the ink guided from the ink reservoir runs out due to use and writing by the writing instrument becomes no longer possible, from the viewpoint of environmental protection, it is preferable that the ink reservoir be able to be refilled with ink. The writing instrument described in PTL 1 has a shaft barrel, an ink reservoir arranged inside of the shaft barrel, and a cap holding the pen tip. To refill ink, the cap is removed from the shaft barrel and a refilling tool in which ink is held is inserted from the front end part of shaft barrel, thereby ink can be supplied to the ink reservoir. [CITATION LIST] [PATENT LITERATURE] [PTL 1] Japanese Unexamined Patent Publication No. 2019-142006 SUMMARY [TECHNICAL PROBLEM] In the writing instrument described in PTL 1, when taking off the cap, the pen tip may be touched and the fingers etc. may be smeared. Further, since the rear end part of the shaft barrel is closed, at the time of supply of the ink, the air inside the ink reservoir and the supplied ink are not suitably exchanged with each other and the supplied ink may overflow from the ink reservoir and in turn the shaft barrel. If slowly supplying ink from the refilling tool, the ink can be prevented from overflowing, but sometimes too much time is taken for refilling. The present invention has as its object the provision of a writing instrument able to easily and quickly refill ink into an ink reservoir. [SOLUTION TO PROBLEM] According to one aspect of the present invention, there is provided a writing instrument comprising a shaft barrel, an ink reservoir arranged inside the shaft barrel and impregnated with ink, an ink refilling part arranged at the rear from the ink reservoir and having an air hole and ink discharge holes, and an ink storage member able to be attached to a rear end part of the shaft barrel and able to hold ink and, configured so that when attaching the ink storage member to a rear end part of the shaft barrel, the ink inside the ink storage member can be supplied to the ink reservoir through the ink discharge holes of the ink refilling part. According to another aspect of the present invention, there is provided an ink storage member for a writing instrument able to be attached to a rear end part of a shaft barrel inside of which an ink refilling part having an air hole and ink discharge holes and an ink reservoir impregnated with ink are arranged, which ink storage member configured so that if attached to the rear end part of the shaft barrel, the ink can be supplied to the ink reservoir through the ink discharge holes of the ink refilling part. The air hole may be provided further closer to a center axis of the shaft barrel than the ink discharge holes. The air hole may be provided on the center axis of the shaft barrel. The ink discharge holes may be provided concentrically cylindrically about the center axis. The ink reservoir may be configured so as to have at least two types of capillary forces. [ADVANTAGEOUS EFFECTS OF INVENTION] According to the aspects of the present invention, the common advantageous effect is exhibited of provision of a writing instrument able to easily and quickly refill ink into an ink reservoir. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view of a writing instrument according to an embodiment of the present invention.FIG. 2 is a vertical cross-sectional view of the writing instrument of FIG. 1.FIG. 3 is a disassembled perspective view of the writing instrument of FIG. 1.FIG. 4 is a vertical cross-sectional view of an ink storage member.FIG. 5 is another vertical cross-sectional view of the ink storage member.FIG. 6 is an enlarged vertical cross-sectional view of a rear end part of a shaft barrel.FIG. 7 is a horizontal cross-sectional view of an ink refilling part.FIG. 8 is a partial cross-sectional perspective view of a shaft barrel showing the ink refilling part.FIG. 9 is another partial cross-sectional perspective view of the shaft barrel showing the ink refilling part.FIG. 10 is a perspective view of a core holding member.FIG. 11 is a vertical cross-sectional view of a core holding member.FIG. 12 is a cross-sectional view along the line D-D of FIG. 11. DESCRIPTION OF EMBODIMENTS Below, while referring to the drawings, an embodiment of the present invention will be explained in detail. Throughout the drawings, corresponding component elements will be assigned common reference notations. FIG. 1 is a perspective view of a writing instrument according to an embodiment of the present invention, FIG. 2 is a vertical cross