Title:
ボールペンチップ、このボールペンチップを利用したボールペン及びこのボールペンチップの製造方法
Document Type and Number:
Japanese Patent JP4318245
Kind Code:
B2
Abstract:
There is provided a ballpoint pen tip that minimizes thin spots such as impact thin spots even if upward writing or an impact causes entry of air, allows rapid return to normal writing, and minimizes manufacturing costs. A writing ball and a check ball included in the ballpoint pen tip are placed close to each other with a slight clearance therebetween to leave an inner space with a slight capacity. Thus, even if air enters from a caulking portion, the volume of the air stored inside is slight, and an air pool can be rapidly eliminated. Further, both the writing ball and the check ball can be provided in a front end of the ballpoint pen tip, and assembly operations can be easily performed without inverting the ballpoint pen tip.
Inventors:
Toru Kitao
Hiroyuki Muto
Hiroyuki Muto
Application Number:
JP2002305750A
Publication Date:
August 19, 2009
Filing Date:
October 21, 2002
Export Citation:
Assignee:
MITSUBISHI PENCIL CO.,LTD.
International Classes:
B43K1/08; B43K7/00; B43K7/02; B43K7/10; B43M11/02
Domestic Patent References:
| JP2001341485A | ||||
| JP2004130749A |
Attorney, Agent or Firm:
Hiromichi Kuroda
Tomohide Kitaguchi
Tomohide Kitaguchi