Ball-point pen refill

Details Ball-point pen refill Ball-point pen refill

2005-08-09

2005-08-09

Nguyen, Tuan (Department: 3751)

Coating implements with material supply

Including ball, roller or endless-belt tool

Ball

C401S18800A

Reexamination Certificate

active

06926458

ABSTRACT:
For producing a pressurized ball-point pen refill the ball-point pen refill includes a tip, an ink storage tube and a tail plug, wherein ink is filled in the space of the ink storage tube relatively near to the tip, and a pressuring gas is filled in the space of the ink storage tube relatively far from the tip. The tip includes a ball and a holder, and the ball is formed to have a surface roughness (Ra) of 0.010 μm to 0.080 μm. The holder has a ball house and an ink guiding groove, and the ball house has a side part and a bottom part. Moreover, a formula 1.01≦φB/φA ≦1.11 is satisfied when φA is the diameter of the ball, and φB is the inner diameter of the side part of the ball house.

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