发明授权
- 专利标题： Ballpoint pen tip, ballpoint pen refill, and ballpoint pen
- 专利标题（中）： 圆珠笔笔尖，圆珠笔笔芯和圆珠笔
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申请号： US13583473申请日： 2011-03-08
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公开(公告)号： US09056518B2公开(公告)日： 2015-06-16
- 发明人: Yoshihide Ishii
- 申请人： Yoshihide Ishii
- 申请人地址： JP Tokyo
- 专利权人： MITSUBISHI PENCIL COMPANY, LIMITED
- 当前专利权人： MITSUBISHI PENCIL COMPANY, LIMITED
- 当前专利权人地址： JP Tokyo
- 代理机构： Westerman, Hattori, Daniels & Adrian, LLP
- 优先权： JP2010-050866 20100308
- 国际申请： PCT/JP2011/055305 WO 20110308
- 国际公布： WO2011/111681 WO 20110915
- 主分类号： B43K7/10
- IPC分类号： B43K7/10 ; B43K1/08 ; B43K7/02 ; B43K15/00
摘要：
A ballpoint pen tip in which ink grooves are formed around an ink guide hole at equally distributed places, the ink guide hole connecting a ball house and a back hole of a holder for holding the writing ball, and the ink grooves radially penetrate through from the ball house side to the front end portion of the back hole. Inward protrusions are formed at positions which are respectively in contact with the rear ends of the ink grooves. If the inner diameter of the ink guide hole is A, the inner diameter of the front end portion of the back hole is B, the diameter of the circle circumscribing the ink grooves is C, and the diameter of the circle inscribing the inward protrusions is D, their relationships are A