Writing implement

Patent metadata

Field	Value
Publication number	US-9889701-B2
Application number	US-201515302409-A
Country	US
Kind code	B2
Filing date	Apr 9, 2015
Priority date	Apr 10, 2014
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

A writing implement in which a joint connecting an ink supply section and a ballpoint pen tip together is configured from three members. The three members configuring the joint are a substantially cylindrical center member, a substantially cylindrical surrounding member formed at the outer periphery of the center member, and an interposing member that is molded by a soft member molded so as to cover the outer periphery of the center member and the surrounding member. An annular gap section is provided between the center member and the surrounding member. The leading end of the ink supply section is fitted into the gap section. The joint is formed by two color molding. The center member and the surrounding member are molded by primary molding, and the interposing member is integrally molded onto the center member and the surrounding member by secondary molding.

First claim

The invention claimed is:

1. A writing implement comprising:
a writing tip;
an ink supply section that supplies ink to the writing tip;
a joint that connects the writing tip and the ink supply section together; and
a shaft that internally houses the writing tip, the ink supply section, and the joint,
the joint including:
a center member that is connected to at least the writing tip,
a surrounding member that is separated from the center member, and
an interposing member that is formed so as to connect the center member and the surrounding member together, and

the interposing member being made of a different material from that of the center member and the surrounding member.

2. The writing implement of claim 1 , wherein the joint is molded by two color molding, the center member and the surrounding member are molded by primary molding, and the interposing member is integrally molded onto the center member and the surrounding member by secondary molding.

3. The writing implement of claim 2 , wherein the interposing member is molded from a softer material than that of the center member and the surrounding member.

4. The writing implement of claim 3 , wherein:
the center member of the joint has a substantially cylindrical shape, and the surrounding member of the joint is formed in a substantially cylindrical shape at an outer periphery of the center member; and
a leading end of the ink supply section is inserted into an annular space formed between the center member and the surrounding member.

Assignees

• Mitsubishi Pencil Co

Inventors

• Fukumoto Takeo
• Nakajima Tooru
• Furukawa Kazuhiko

Classifications

• B43K1/08

  with ball points; Balls or ball beds {(B43M11/085 takes precedence)} · CPC title

• B43K7/00

  Ball-point pens ({B43M11/085 takes precedence}; multiple-point writing implements B43K27/00) · CPC title

• B43K7/005 Primary

  Pen barrels · CPC title

• B43K8/00

  Pens with writing-points other than nibs or balls (brushes with reservoir for supplying substances A46B11/00) · CPC title

• B43K7/10 Primary

  Arrangements for feeding ink to the ball points (B43K7/01 takes precedence) · CPC title