Ballpoint pen tip, manufacturing method therefor, and ballpoint

Details Ballpoint pen tip, manufacturing method therefor, and ballpoint Ballpoint pen tip, manufacturing method therefor, and ballpoint

1997-12-09

1999-05-18

Walczak, David J.

Coating implements with material supply

Including ball, roller or endless-belt tool

Ball

401216, B43K7/00

Patent

active

059044322

ABSTRACT:
A ballpoint pen tip including a metallic pipe having a plurality of inwardly projecting portions at a neighborhood of a front end portion of the pipe at regular intervals, and a front end edge portion at a front end of the pipe, and a ball rotatably held between the front end edge portion and the plurality of inwardly projecting portions, wherein the pipe satisfies a relation of A/T.ltoreq.5.8 where A is an outer diameter of the ball and T is a thickness 10 of the pipe, and also the relation of B/T.ltoreq.2.3 where B is a diameter of a virtual inscribing circle contacting a top of the plurality of inwardly projecting portions and T is the same as above.

REFERENCES:
patent: 2879586 (1959-03-01), Fehling et al.
patent: 2957453 (1960-10-01), Eckerle
patent: 4311403 (1982-01-01), Liguori
patent: 4457644 (1984-07-01), Yokosuka
patent: 4789263 (1988-12-01), Germann

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