发明申请
- 专利标题: Ball-point pen tip and ink refill
- 专利标题(中): 圆珠笔笔尖和墨水笔芯
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申请号: US12310618申请日: 2007-08-27
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公开(公告)号: US20100254750A1公开(公告)日: 2010-10-07
- 发明人: Mitsuhiro Ohashi , Atsushi Nakajima , Kazuhiko Furukawa , Hiroyuki Muto
- 申请人: Mitsuhiro Ohashi , Atsushi Nakajima , Kazuhiko Furukawa , Hiroyuki Muto
- 优先权: JP2006-238163 20060901
- 国际申请: PCT/JP2007/066558 WO 20070827
- 主分类号: B43K7/00
- IPC分类号: B43K7/00
摘要:
There is provided a ballpoint pen tip in which a shoulder of a bent portion does not touch a paper surface during writing and bleeding caused by deformation of an inner periphery of the bent portion can be prevented, and an ink refill using thereof. The ballpoint pen tip 20 comprises a first tapered surface 22 formed by tapering an outer periphery at a front end of a holder 21, a connecting surface 23 that is formed at a front end side of the first tapered surface 22 and has an outside angle larger than 180° with respect to the first tapered surface 22, a second tapered surface 24 that is formed at a front end side of the connecting surface 23 and has an outside angle smaller than 180° with respect to the connecting surface 23, and a bent portion 25 in which a front end portion of the second tapered surface 24 is bent inwardly so as to hold a writing ball 35 inserted into a ball house 29. A boundary between the first tapered surface 22 and the connecting surface 23 is referred to as a first shoulder portion 26, and a boundary between the second tapered surface 24 and the bent portion 25 a second shoulder portion 27. The second shoulder portion 27 is located inside a virtual tangent line 41 between the first shoulder portion 26 and the writing ball 35.
公开/授权文献
- US07862249B2 Ball-point pen tip and ink refill 公开/授权日:2011-01-04