Ball-point pen tip and ink refill

Details Ball-point pen tip and ink refill Ball-point pen tip and ink refill

2011-01-04

2011-01-04

Walczak, David J (Department: 3751)

Coating implements with material supply

Including ball, roller or endless-belt tool

Ball

C401S209000

Reexamination Certificate

active

07862249

ABSTRACT:
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 tip20comprises a first tapered surface22formed by tapering an outer periphery at a front end of a holder21,a connecting surface23that is formed at a front end side of the first tapered surface22and has an outside angle larger than 180° with respect to the first tapered surface22, a second tapered surface24that is formed at a front end side of the connecting surface23and has an outside angle smaller than 180° with respect to the connecting surface23, and a bent portion25in which a front end portion of the second tapered surface24is bent inwardly so as to hold a writing ball35inserted into a ball house29.A boundary between the first tapered surface22and the connecting surface23is referred to as a first shoulder portion26, and a boundary between the second tapered surface24and the bent portion25a second shoulder portion27. The second shoulder portion27is located inside a virtual tangent line41between the first shoulder portion26and the writing ball35.

REFERENCES:
patent: 3252214 (1966-05-01), Fisher
patent: 5876142 (1999-03-01), Furukawa
patent: 6082920 (2000-07-01), Furukawa
patent: 10-329475 (1998-12-01), None
patent: 3156988 (2001-02-01), None
patent: 2002-200877 (2002-07-01), None
patent: 2003-276383 (2003-09-01), None
patent: 2003-320781 (2003-11-01), None
patent: 98/30401 (1998-07-01), None

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