Ballpoint pen and cap therefor

Details Ballpoint pen and cap therefor Ballpoint pen and cap therefor

1994-12-22

2000-06-20

Walczak, David J.

Coating implements with material supply

Including ball, roller or endless-belt tool

Ball

401216, B43K 700

Patent

active

060769874

ABSTRACT:
The present invention provides the ballpoint pen that precludes the possibility of the pipe portion bending at the joint thereof can be provided even if the outer diameter D is small. In the ballpoint pen having a ballpoint pen tip at a front end thereof, the ballpoint pen tip rotatably accommodating a ball at a front end of a pipe made of metal, an outwardly projecting pipe portion having a uniform thickness throughout the length thereof is arranged at a front end of the ballpoint pen tip, and if a length of the pipe portion is L, an outer diameter of the pipe portion is D, a relational expression "L/D.ltoreq.4.0" is satisfied.

REFERENCES:
patent: 3418057 (1968-12-01), Shea
patent: 4139313 (1979-02-01), Hori
patent: 4251164 (1981-02-01), Nakagawa et al.
patent: 4311403 (1982-01-01), Liguori
patent: 4457644 (1984-07-01), Yokosuka
patent: 4842433 (1989-06-01), Otsuka

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