发明名称 |
Ballpoint pen tip |
摘要 |
A ballpoint pen tip including a metallic pipe having a plurality of inwardly projecting portions at a neighborhood of a front end portion of the pipe at regular intervals, and a front end edge portion at a front end of the pipe, and a ball rotatably held between the front end edge portion and the plurality of inwardly projecting portions, wherein the pipe satisfies a relation of A/T</=5.8 where A is an outer diameter of the ball and T is a thickness 10 of the pipe, and also the relation of B/T</=2.3 where B is a diameter of a virtual inscribing circle contacting a top of the plurality of inwardly projecting portions and T is the same as above.
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申请公布号 |
US5899625(A) |
申请公布日期 |
1999.05.04 |
申请号 |
US19970987866 |
申请日期 |
1997.12.09 |
申请人 |
THE PILOT INK CO., LTD. |
发明人 |
ANDO, MASASHI;SEKINE, NOBUO;KONDO, MASAHIRO;ASAMI, HIDEAKI;MATSUBARA, NOBUO |
分类号 |
B43K1/08;(IPC1-7):B43K7/00;B43K7/10 |
主分类号 |
B43K1/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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